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Talib J, Abatan AA, HoekSpaans R, Yamba EI, Egbebiyi TS, Caminade C, Jones A, Birch CE, Olagbegi OM, Morse AP. The effect of explicit convection on simulated malaria transmission across Africa. PLoS One 2024; 19:e0297744. [PMID: 38625879 PMCID: PMC11020401 DOI: 10.1371/journal.pone.0297744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Accepted: 01/11/2024] [Indexed: 04/18/2024] Open
Abstract
Malaria transmission across sub-Saharan Africa is sensitive to rainfall and temperature. Whilst different malaria modelling techniques and climate simulations have been used to predict malaria transmission risk, most of these studies use coarse-resolution climate models. In these models convection, atmospheric vertical motion driven by instability gradients and responsible for heavy rainfall, is parameterised. Over the past decade enhanced computational capabilities have enabled the simulation of high-resolution continental-scale climates with an explicit representation of convection. In this study we use two malaria models, the Liverpool Malaria Model (LMM) and Vector-Borne Disease Community Model of the International Centre for Theoretical Physics (VECTRI), to investigate the effect of explicitly representing convection on simulated malaria transmission. The concluded impact of explicitly representing convection on simulated malaria transmission depends on the chosen malaria model and local climatic conditions. For instance, in the East African highlands, cooler temperatures when explicitly representing convection decreases LMM-predicted malaria transmission risk by approximately 55%, but has a negligible effect in VECTRI simulations. Even though explicitly representing convection improves rainfall characteristics, concluding that explicit convection improves simulated malaria transmission depends on the chosen metric and malaria model. For example, whilst we conclude improvements of 45% and 23% in root mean squared differences of the annual-mean reproduction number and entomological inoculation rate for VECTRI and the LMM respectively, bias-correcting mean climate conditions minimises these improvements. The projected impact of anthropogenic climate change on malaria incidence is also sensitive to the chosen malaria model and representation of convection. The LMM is relatively insensitive to future changes in precipitation intensity, whilst VECTRI predicts increased risk across the Sahel due to enhanced rainfall. We postulate that VECTRI's enhanced sensitivity to precipitation changes compared to the LMM is due to the inclusion of surface hydrology. Future research should continue assessing the effect of high-resolution climate modelling in impact-based forecasting.
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Affiliation(s)
- Joshua Talib
- U.K. Centre for Ecology and Hydrology (UKCEH), Wallingford, United Kingdom
| | - Abayomi A. Abatan
- College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, United Kingdom
| | - Remy HoekSpaans
- Liverpool School of Tropical Medicine (LSTM), Liverpool, United Kingdom
| | - Edmund I. Yamba
- Department of Meteorology and Climate Science, Kwame Nkrumah University of Science and Technology (KNUST), Kumasi, Ghana
| | - Temitope S. Egbebiyi
- Climate Systems Analysis Group, Department of Environmental and Geographical Science, University of Cape Town, Cape Town, South Africa
| | - Cyril Caminade
- Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, United Kingdom
- The Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy
| | - Anne Jones
- International Business Machines (IBM) Research Europe, Daresbury, United Kingdom
| | - Cathryn E. Birch
- School of Earth and Environment, University of Leeds, Leeds, United Kingdom
| | - Oladapo M. Olagbegi
- School of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
| | - Andrew P. Morse
- School of Environmental Sciences, University of Liverpool, Liverpool, United Kingdom
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Thangarajah BR. Hemodiafiltration: a synergy yet to be convincing. J Bras Nefrol 2024; 46:e2024PO02. [PMID: 38527156 DOI: 10.1590/2175-8239-jbn-2024-po02en] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Accepted: 11/21/2023] [Indexed: 03/27/2024] Open
Abstract
The desperate attempt to improve mortality, morbidity, quality of life and patient-reported outcomes in patients on hemodialysis has led to multiple attempts to improve the different modes, frequencies, and durations of dialysis sessions in the last few decades. Nothing has been more appealing than the combination of diffusion and convection in the form of hemodiafiltration. Despite the concrete evidence of better clearance of middle weight molecules and better hemodynamic stability, tangible evidence to support the universal adoption is still at a distance. Survival benefits seen in selected groups who are likely to tolerate hemodiafiltration with better vascular access and with lower comorbid burden, need to be extended to real life dialysis patients who are older than the population studied and have significantly higher comorbid burden. Technical demands of initiation hemodiafiltration, the associated costs, and the incremental benefits targeted, along with patient-reported outcomes, need to be explored further before recommending hemodiafiltration as the mode of choice.
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Stubbs J, Hornsey T, Hanrahan N, Esteban LB, Bolton R, Malý M, Basu S, Orlans J, de Sanctis D, Shim JU, Shaw Stewart PD, Orville AM, Tews I, West J. Droplet microfluidics for time-resolved serial crystallography. IUCrJ 2024; 11:237-248. [PMID: 38446456 PMCID: PMC10916287 DOI: 10.1107/s2052252524001799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Accepted: 02/23/2024] [Indexed: 03/07/2024]
Abstract
Serial crystallography requires large numbers of microcrystals and robust strategies to rapidly apply substrates to initiate reactions in time-resolved studies. Here, we report the use of droplet miniaturization for the controlled production of uniform crystals, providing an avenue for controlled substrate addition and synchronous reaction initiation. The approach was evaluated using two enzymatic systems, yielding 3 µm crystals of lysozyme and 2 µm crystals of Pdx1, an Arabidopsis enzyme involved in vitamin B6 biosynthesis. A seeding strategy was used to overcome the improbability of Pdx1 nucleation occurring with diminishing droplet volumes. Convection within droplets was exploited for rapid crystal mixing with ligands. Mixing times of <2 ms were achieved. Droplet microfluidics for crystal size engineering and rapid micromixing can be utilized to advance time-resolved serial crystallography.
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Affiliation(s)
- Jack Stubbs
- School of Biological Sciences, Faculty of Environmental and Life Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - Theo Hornsey
- School of Biological Sciences, Faculty of Environmental and Life Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
| | - Niall Hanrahan
- School of Chemistry, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
- Institute for Life Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
| | - Luis Blay Esteban
- Universitat Carlemany, Avenida Verge de Canolich, 47, Sant Julia de Loria, Principat d’Andorra AD600, Spain
| | - Rachel Bolton
- School of Biological Sciences, Faculty of Environmental and Life Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - Martin Malý
- School of Biological Sciences, Faculty of Environmental and Life Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
- Institute for Life Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
| | - Shibom Basu
- European Molecular Biology Laboratory, Grenoble Outstation, 71 Avenue des Martyrs, CS 90181, Grenoble 38042, Cedex 9, France
| | - Julien Orlans
- European Synchrotron Radiation Facility (ESRF), 71 Avenue des Martyrs, Grenoble 38042, Cedex 9, France
| | - Daniele de Sanctis
- European Synchrotron Radiation Facility (ESRF), 71 Avenue des Martyrs, Grenoble 38042, Cedex 9, France
| | - Jung-uk Shim
- Faculty of Engineering and Physical Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom
| | | | - Allen M. Orville
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, United Kingdom
- Research Complex at Harwell, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0FA, United Kingdom
| | - Ivo Tews
- School of Biological Sciences, Faculty of Environmental and Life Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
- Institute for Life Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
| | - Jonathan West
- Institute for Life Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
- Cancer Sciences, Faculty of Medicine, University of Southampton, Southampton SO17 1BJ, United Kingdom
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Bareen A, Dash S, Kalita P, Dash KK. Experimental investigation of an indirect solar dryer with PCM-integrated solar collector as a thermal energy storage medium. Environ Sci Pollut Res Int 2024; 31:18209-18225. [PMID: 37041357 DOI: 10.1007/s11356-023-26690-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Accepted: 03/23/2023] [Indexed: 06/19/2023]
Abstract
An indirect-type forced convection solar dryer implementing a phase-changing material (PCM) as the energy-storing medium was designed, fabricated, and investigated in this study. The effects of changing the mass flow rate on the valuable energy and thermal efficiencies were studied. The experimental results showed that the instantaneous and daily efficiencies of the indirect solar dryer (ISD) increased with the initial increase in mass flow rate, beyond which the change is not prominent both with and without using the PCM. The system consisted of a solar energy accumulator (solar air collector with a PCM cavity), a drying compartment, and a blower. The charging and discharging characteristics of the thermal energy storage unit were evaluated experimentally. It was found that after using PCM, drying air temperature was higher than ambient air temperature by 9-12 ℃ after sunset for 4 h. Using PCM accelerated the process by which Cymbopogon citratus was effectively dried between 42 and 59 °C of drying air. Energy and exergy analysis of the drying process was performed. The daily energy efficiency of the solar energy accumulator reached 35.8%, while the daily exergy efficiency reached 13.84%. The exergy efficiency of the drying chamber was in the range of 47-97%. A free energy source, a large reduction in drying time, a higher drying capacity, a decrease in mass losses, and improved product quality all contributed to the proposed solar dryer's high potential.
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Affiliation(s)
- Abdullah Bareen
- Department of Food Engineering and Technology, Tezpur University, Tezpur, Assam, 784028, India
| | - Soumya Dash
- Centre for Management Studies, North Eastern Regional Institute of Science and Technology, Nirjuli, Arunachal Pradesh, 791109, India
| | - Paragmoni Kalita
- Department of Food Engineering and Technology, Tezpur University, Tezpur, Assam, 784028, India
| | - Kshirod Kumar Dash
- Department of Food Engineering and Technology, Tezpur University, Tezpur, Assam, 784028, India.
- Department of Food Processing Technology, Ghani Khan Choudhury Institute of Engineering and Technology (GKCIET), Malda, West Bengal, 732141, India.
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Zhang Z, Zhang L, Huang Z, Xu Y, Zhao Q, Wang H, Shi M, Li X, Jiang K, Wu D. "Floating Catalytic Foam" with prominent heat-induced convection for the effective photocatalytic removal of antibiotics. J Hazard Mater 2024; 463:132879. [PMID: 37944238 DOI: 10.1016/j.jhazmat.2023.132879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Revised: 10/23/2023] [Accepted: 10/26/2023] [Indexed: 11/12/2023]
Abstract
Immobilized photocatalysts represent a promising candidate for the wastewater treatments due to their good reusability, high stability and low eco-risk. Mass transfer within the immobilized catalytic bed is a crucial process that determines the contacting, adsorption, and degradation kinetics in the photodegradation. In this study, a floating catalytic foam (FCF) with a prominent pumping effect was designed to promote mass transfer. The polyurethane foam immobilized with rGO/TiO2/ultrathin-g-C3N4 photocatalyst (PRTCN) was prepared by a simple dip-coating and Uv-light aging process. It was found that the hydrophilic-hydrophobic interfaces could not only contribute to the floating of the catalyst but also establish a temperature gradient across the floating immobilized catalyst. In addition, the temperature gradient induced convection could serve as a built-in pump to effectively promote the diffusion and adsorption of target antibiotic molecules during the photocatalytic process. Therefore, the PRTCN demonstrated a high photodegradation and mineralization efficiency with excellent reusability and anti-interference capability. Moreover, the photodegradation mechanism and the intermediates' toxicity of norfloxacin were detailly investigated by ultra-high resolution electrospray time-of-flight mass spectrometry, density functional theory simulation and ECOSAR estimation. This work proposed a facile and sustainable strategy to enhance the mass transfer problem on immobilized photocatalysts, which could promote the application of the immobilized photocatalysts in the real water-treatment scenarios.
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Affiliation(s)
- Zhe Zhang
- School of Environment, Henan Normal University, Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Xinxiang, Henan 453007, China
| | - Lu Zhang
- School of Environment, Henan Normal University, Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Xinxiang, Henan 453007, China.
| | - Zhihao Huang
- School of Environment, Henan Normal University, Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Xinxiang, Henan 453007, China
| | - Yuxin Xu
- School of Environment, Henan Normal University, Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Xinxiang, Henan 453007, China
| | - Qingqing Zhao
- School of Environment, Henan Normal University, Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Xinxiang, Henan 453007, China
| | - Hongju Wang
- School of Environment, Henan Normal University, Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Xinxiang, Henan 453007, China
| | - Meiqing Shi
- School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China.
| | - Xiangnan Li
- School of Chemistry and Chemical Engineering, Henan Normal University, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Xinxiang, Henan 453007, China
| | - Kai Jiang
- School of Environment, Henan Normal University, Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Xinxiang, Henan 453007, China
| | - Dapeng Wu
- School of Environment, Henan Normal University, Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Xinxiang, Henan 453007, China; School of Chemistry and Chemical Engineering, Henan Normal University, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Xinxiang, Henan 453007, China.
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6
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Kreatsoulas D, Damante M, Cua S, Lonser RR. Adjuvant convection-enhanced delivery for the treatment of brain tumors. J Neurooncol 2024; 166:243-255. [PMID: 38261143 PMCID: PMC10834622 DOI: 10.1007/s11060-023-04552-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 12/22/2023] [Indexed: 01/24/2024]
Abstract
BACKGROUND Malignant gliomas are a therapeutic challenge and remain nearly uniformly fatal. While new targeted chemotherapeutic agentsagainst malignant glioma have been developed in vitro, these putative therapeutics have not been translated into successful clinical treatments. The lack of clinical effectiveness can be the result of ineffective biologic strategies, heterogeneous tumor targets and/or the result of poortherapeutic distribution to malignant glioma cells using conventional nervous system delivery modalities (intravascular, cerebrospinal fluid and/orpolymer implantation), and/or ineffective biologic strategies. METHODS The authors performed a review of the literature for the terms "convection enhanced delivery", "glioblastoma", and "glioma". Selectclinical trials were summarized based on their various biological mechanisms and technological innovation, focusing on more recently publisheddata when possible. RESULTS We describe the properties, features and landmark clinical trials associated with convection-enhanced delivery for malignant gliomas.We also discuss future trends that will be vital to CED innovation and improvement. CONCLUSION Efficacy of CED for malignant glioma to date has been mixed, but improvements in technology and therapeutic agents arepromising.
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Affiliation(s)
- Daniel Kreatsoulas
- Department of Neurological Surgery, The Ohio State University Wexner Medical Center, The Ohio State University, N1019 Doan Hall, 410 W 10Th Avenue, Columbus, OH, 43210, USA.
| | - Mark Damante
- Department of Neurological Surgery, The Ohio State University Wexner Medical Center, The Ohio State University, N1019 Doan Hall, 410 W 10Th Avenue, Columbus, OH, 43210, USA
| | - Santino Cua
- Department of Neurological Surgery, The Ohio State University Wexner Medical Center, The Ohio State University, N1019 Doan Hall, 410 W 10Th Avenue, Columbus, OH, 43210, USA
| | - Russell R Lonser
- Department of Neurological Surgery, The Ohio State University Wexner Medical Center, The Ohio State University, N1019 Doan Hall, 410 W 10Th Avenue, Columbus, OH, 43210, USA
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Peña Pino I, Darrow DP, Chen CC. Magnetic Resonance Imaging-Aided SmartFlow Convection Delivery of DNX-2401: A Pilot, Prospective Case Series. World Neurosurg 2024; 181:e833-e840. [PMID: 37925150 DOI: 10.1016/j.wneu.2023.10.142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Accepted: 10/30/2023] [Indexed: 11/06/2023]
Abstract
BACKGROUND The Combination Adenovirus + Pembrolizumab to Trigger Immune Virus Effects (CAPTIVE) study is a phase II clinical trial testing the efficacy of a recombinant adenovirus DNX-2401 combined with the immune checkpoint inhibitor pembrolizumab. Here, we report the first patients in this study who underwent viral delivery through real-time magnetic resonance imaging (MRI) stereotaxis-guided SmartFlow convection delivery of DNX-2401. METHODS Patients who underwent real-time MRI-guided DNX-2401 delivery through the SmartFlow convection catheter were prospectively followed. RESULTS Precise catheter placement was achieved in all patients treated, and no adverse events were noted. Average radial error from target was 0.9 mm. Average procedural time was 3 hours 16 minutes and was comparable to other convection-enhanced delivery techniques. In 2 patients, delivery of DNX-2401 was visualized as >1 cm maximal diameter of T1 hypointensity infusate on MRI obtained immediately after completion of viral infusion. These patients exhibited partial response based on Response Assessment in Neuro-Oncology assessment. The remaining patient showed <1 cm maximal diameter of infusate on immediate postinfusion MRI and showed disease progression on subsequent MRI. CONCLUSIONS Our pilot case series supports compatibility of the SmartFlow system with oncolytic adenovirus delivery and provides the basis for future validation studies.
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Affiliation(s)
- Isabela Peña Pino
- Department of Neurosurgery, University of Minnesota, Minneapolis, Minnesota, USA
| | - David P Darrow
- Department of Neurosurgery, University of Minnesota, Minneapolis, Minnesota, USA
| | - Clark C Chen
- Department of Neurosurgery, University of Minnesota, Minneapolis, Minnesota, USA.
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MacKeigan D, Feja M, Gernert M. Chronic intermittent convection-enhanced delivery of vigabatrin to the bilateral subthalamic nucleus in an acute rat seizure model. Epilepsy Res 2024; 199:107276. [PMID: 38091904 DOI: 10.1016/j.eplepsyres.2023.107276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 11/16/2023] [Accepted: 12/05/2023] [Indexed: 01/13/2024]
Abstract
Targeted intracerebral drug delivery is an attractive experimental approach for the treatment of drug-resistant epilepsies. In this regard, the subthalamic nucleus (STN) represents a focus-independent target involved in the remote modulation and propagation of seizure activity. Indeed, acute and chronic pharmacological inhibition of the STN with vigabatrin (VGB), an irreversible inhibitor of GABA transaminase, has been shown to produce antiseizure effects. This effect, however, is lost over time as tolerance develops with chronic, continuous intracerebral pharmacotherapy. Here we investigated the antiseizure effects of chronic intermittent intra-STN convection-enhanced delivery of VGB in an acute rat seizure model focusing on circumventing tolerance development and preventing adverse effects. Timed intravenous pentylenetetrazol (PTZ) seizure threshold testing was conducted before and after implantation of subcutaneous drug pumps and bilateral intra-STN cannulas. Drug pumps infused vehicle or VGB twice daily (0.4 µg) or once weekly (2.5 µg, 5 µg) over three weeks. Putative adverse effects were evaluated and found to be prevented by intermittent compared to previous continuous VGB delivery. Clonic seizure thresholds were more clearly raised by intra-STN VGB compared to myoclonic twitch. Both twice daily and once weekly intra-STN VGB significantly elevated clonic seizure thresholds depending on dose and time point, with responder rates of up to 100% observed at tolerable doses. However, tolerance could not be completely avoided, as tolerance rates of 40-75% were observed with chronic VGB treatment. Results indicate that the extent of tolerance development after intermittent intra-STN VGB delivery varies depending on infusion dose and regimen.
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Affiliation(s)
- Devlin MacKeigan
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, Bünteweg 17, D-30559 Hannover, Germany; Center for Systems Neuroscience, University of Veterinary Medicine Hannover, Bünteweg 2, D-30559 Hannover, Germany
| | - Malte Feja
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, Bünteweg 17, D-30559 Hannover, Germany; Center for Systems Neuroscience, University of Veterinary Medicine Hannover, Bünteweg 2, D-30559 Hannover, Germany.
| | - Manuela Gernert
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, Bünteweg 17, D-30559 Hannover, Germany; Center for Systems Neuroscience, University of Veterinary Medicine Hannover, Bünteweg 2, D-30559 Hannover, Germany.
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9
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Mueller S, Kline C, Stoller S, Lundy S, Christopher L, Reddy AT, Banerjee A, Cooney TM, Raber S, Hoffman C, Luks T, Wembacher-Schroeder E, Lummel N, Zhang Y, Bonner ER, Nazarian J, Molinaro AM, Prados M, Villanueva-Meyer JE, Gupta N. PNOC015: Repeated convection-enhanced delivery of MTX110 (aqueous panobinostat) in children with newly diagnosed diffuse intrinsic pontine glioma. Neuro Oncol 2023; 25:2074-2086. [PMID: 37318058 PMCID: PMC10628948 DOI: 10.1093/neuonc/noad105] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Indexed: 06/16/2023] Open
Abstract
BACKGROUND The objective of this study was to determine the safety, tolerability, and distribution of MTX110 (aqueous panobinostat) delivered by convection-enhanced delivery (CED) in patients with newly diagnosed diffuse intrinsic pontine glioma (DIPG) who completed focal radiation therapy (RT). METHODS Patients with DIPG (2-21 years) were enrolled after RT. CED of MTX110 combined with gadoteridol was completed across 7 dose levels (DL) (30-90 µM; volumes ranging from 3 mL to 2 consecutive doses of 6 mL). An accelerated dose escalation design was used. Distribution of infusate was monitored with real-time MR imaging. Repeat CED was performed every 4-8 weeks. Quality-of-life (QoL) assessments were obtained at baseline, every 3 months on therapy, and end of therapy. RESULTS Between May 2018 and March 2020, 7 patients who received a total of 48 CED infusions, were enrolled (median age 8 years, range 5-21). Three patients experienced dose-limited toxicities. Four grade 3 treatment-related adverse events were observed. Most toxicities were transient new or worsening neurologic function. Median overall survival (OS) was 26.1 months (95% confidence interval: 14.8-not reached). Progression-free survival was 4-14 months (median, 7). Cumulative percentage of tumor coverage for combined CED infusions per patient ranged from 35.6% to 81.0%. Increased CED infusions were negatively associated with self-reported QoL assessments. CONCLUSION Repeat CED of MTX110 with real-time imaging with gadoteridol is tolerable for patients with DIPG. Median OS of 26.1 months compares favorably with historical data for children with DIPG. The results support further investigation of this strategy in a larger cohort.
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Affiliation(s)
- Sabine Mueller
- Department of Neurology, University of California, San Francisco, San Francisco, California, USA
- Department of Pediatrics, University of California, San Francisco, San Francisco, California, USA
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, California, USA
- Department of Pediatrics, University of Zurich, Zurich, Switzerland
| | - Cassie Kline
- Division of Oncology, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
- Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Schuyler Stoller
- Department of Neurology, University of California, San Francisco, San Francisco, California, USA
| | - Shannon Lundy
- Department of Pediatrics, University of California, San Francisco, San Francisco, California, USA
| | - Lauren Christopher
- Department of Pediatrics, University of California, San Francisco, San Francisco, California, USA
| | - Alyssa T Reddy
- Department of Neurology, University of California, San Francisco, San Francisco, California, USA
- Department of Pediatrics, University of California, San Francisco, San Francisco, California, USA
| | - Anu Banerjee
- Department of Pediatrics, University of California, San Francisco, San Francisco, California, USA
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, California, USA
| | - Tabitha M Cooney
- Department of Pediatric Oncology, Dana-Farber/Boston Children’s Cancer and Blood Disorder Center, Boston, Massachusetts, USA
| | - Shannon Raber
- Department of Pediatrics, University of California, San Francisco, San Francisco, California, USA
| | - Carly Hoffman
- Department of Pediatrics, University of California, San Francisco, San Francisco, California, USA
| | - Tracy Luks
- Department of Radiology, University of California, San Francisco, San Francisco, California, USA
| | | | | | - Yalan Zhang
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, California, USA
| | - Erin R Bonner
- Center for Genetic Medicine Research, Children’s National Medical Center, Washington, DC, USA
| | - Javad Nazarian
- Department of Pediatrics, University of Zurich, Zurich, Switzerland
- Center for Genetic Medicine Research, Children’s National Medical Center, Washington, DC, USA
| | - Annette M Molinaro
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, California, USA
| | - Michael Prados
- Department of Pediatrics, University of California, San Francisco, San Francisco, California, USA
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, California, USA
| | - Javier E Villanueva-Meyer
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, California, USA
- Department of Radiology, University of California, San Francisco, San Francisco, California, USA
| | - Nalin Gupta
- Department of Pediatrics, University of California, San Francisco, San Francisco, California, USA
- Department of Neurological Surgery, University of California, San Francisco, San Francisco, California, USA
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10
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Yuan Q, Li M, Desch SJ, Ko B, Deng H, Garnero EJ, Gabriel TSJ, Kegerreis JA, Miyazaki Y, Eke V, Asimow PD. Moon-forming impactor as a source of Earth's basal mantle anomalies. Nature 2023; 623:95-99. [PMID: 37914947 DOI: 10.1038/s41586-023-06589-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Accepted: 08/30/2023] [Indexed: 11/03/2023]
Abstract
Seismic images of Earth's interior have revealed two continent-sized anomalies with low seismic velocities, known as the large low-velocity provinces (LLVPs), in the lowermost mantle1. The LLVPs are often interpreted as intrinsically dense heterogeneities that are compositionally distinct from the surrounding mantle2. Here we show that LLVPs may represent buried relics of Theia mantle material (TMM) that was preserved in proto-Earth's mantle after the Moon-forming giant impact3. Our canonical giant-impact simulations show that a fraction of Theia's mantle could have been delivered to proto-Earth's solid lower mantle. We find that TMM is intrinsically 2.0-3.5% denser than proto-Earth's mantle based on models of Theia's mantle and the observed higher FeO content of the Moon. Our mantle convection models show that dense TMM blobs with a size of tens of kilometres after the impact can later sink and accumulate into LLVP-like thermochemical piles atop Earth's core and survive to the present day. The LLVPs may, thus, be a natural consequence of the Moon-forming giant impact. Because giant impacts are common at the end stages of planet accretion, similar mantle heterogeneities caused by impacts may also exist in the interiors of other planetary bodies.
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Affiliation(s)
- Qian Yuan
- School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA.
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA.
| | - Mingming Li
- School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA
| | - Steven J Desch
- School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA
| | - Byeongkwan Ko
- School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA
- Department of Earth and Environmental Sciences, Michigan State University, East Lansing, MI, USA
| | - Hongping Deng
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, China
| | - Edward J Garnero
- School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA
| | | | | | - Yoshinori Miyazaki
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
| | - Vincent Eke
- Institute for Computational Cosmology, Department of Physics, Durham University, Durham, UK
| | - Paul D Asimow
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
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11
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Negero NT. Uniformly convergent extended cubic B-spline collocation method for two parameters singularly perturbed time-delayed convection-diffusion problems. BMC Res Notes 2023; 16:282. [PMID: 37858117 PMCID: PMC10588288 DOI: 10.1186/s13104-023-06457-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Accepted: 08/10/2023] [Indexed: 10/21/2023] Open
Abstract
This work proposes a uniformly convergent numerical scheme to solve singularly perturbed parabolic problems of large time delay with two small parameters. The approach uses implicit Euler and the exponentially fitted extended cubic B-spline for time and space derivatives respectively. Extended cubic B-splines have advantages over classical B-splines. This is because for a given value of the free parameter [Formula: see text] the solution obtained by the extended B-spline is better than the solution obtained by the classical B-spline. To confirm the correspondence of the numerical methods with the theoretical results, numerical examples are presented. The present numerical technique converges uniformly, leading to the current study of being more efficient.
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Affiliation(s)
- Naol Tufa Negero
- Department of Mathematics, Wollega University, 395, Nekemte, Oromia, Ethiopia.
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12
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MacKeigan D, Feja M, Meller S, Deking L, Javadova A, Veenhuis A, Felmy F, Gernert M. Long-lasting antiseizure effects of chronic intrasubthalamic convection-enhanced delivery of valproate. Neurobiol Dis 2023; 187:106321. [PMID: 37832796 DOI: 10.1016/j.nbd.2023.106321] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 09/25/2023] [Accepted: 10/10/2023] [Indexed: 10/15/2023] Open
Abstract
Intracerebral drug delivery is an experimental approach for the treatment of drug-resistant epilepsies that allows for pharmacological intervention in targeted brain regions. Previous studies have shown that targeted pharmacological inhibition of the subthalamic nucleus (STN) via modulators of the GABAergic system produces antiseizure effects. However, with chronic treatment, antiseizure effects are lost as tolerance develops. Here, we report that chronic intrasubthalamic microinfusion of valproate (VPA), an antiseizure medication known for its wide range of mechanisms of action, can produce long-lasting antiseizure effects over three weeks in rats. In the intravenous pentylenetetrazole seizure-threshold test, seizure thresholds were determined before and during chronic VPA application (480 μg/d, 720 μg/d, 960 μg/d) to the bilateral STN. Results indicate a dose-dependent variation in VPA-induced antiseizure effects with mean increases in seizure threshold of up to 33%, and individual increases of up to 150%. The lowest VPA dose showed a complete lack of tolerance development with long-lasting antiseizure effects. Behavioral testing with all doses revealed few, acceptable adverse effects. VPA concentrations were high in STN and low in plasma and liver. In vitro electrophysiology with bath applied VPA revealed a reduction in spontaneous firing rate, increased background membrane potential, decreased input resistance and a significant reduction in peak NMDA, but not AMPA, receptor currents in STN neurons. Our results suggest an advantage of VPA over purely GABAergic modulators in preventing tolerance development with chronic intrasubthalamic drug delivery and provide first mechanistic insights in intracerebral pharmacotherapy targeting the STN.
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Affiliation(s)
- Devlin MacKeigan
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, 30559 Hannover, Germany; Center for Systems Neuroscience, 30559 Hannover, Germany
| | - Malte Feja
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, 30559 Hannover, Germany; Center for Systems Neuroscience, 30559 Hannover, Germany.
| | - Sebastian Meller
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, 30559 Hannover, Germany
| | - Lillian Deking
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, 30559 Hannover, Germany
| | - Amina Javadova
- Center for Systems Neuroscience, 30559 Hannover, Germany; Institute for Zoology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany
| | - Alva Veenhuis
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, 30559 Hannover, Germany
| | - Felix Felmy
- Center for Systems Neuroscience, 30559 Hannover, Germany; Institute for Zoology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany
| | - Manuela Gernert
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, 30559 Hannover, Germany; Center for Systems Neuroscience, 30559 Hannover, Germany.
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13
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Striker GG. An overview of oxygen transport in plants: diffusion and convection. Plant Biol (Stuttg) 2023; 25:842-847. [PMID: 37408446 DOI: 10.1111/plb.13558] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Accepted: 06/27/2023] [Indexed: 07/07/2023]
Abstract
The movement of gases within plants is crucial for species that live in flood-prone areas with limited soil oxygen. These plants adapt to hypoxia/anoxia not by using oxygen more efficiently, but by ensuring a steady oxygen supply to their cells. Wetland plants typically form gas-filled spaces (aerenchyma) in their tissues, providing a low-resistance pathway for gas movement between shoots and roots, especially when the shoots are above water, and the roots are submerged. Oxygen movement in plant roots is mainly through diffusion. However, in certain species, such as emergent and floating-leaved plants, pressurized flows can also facilitate the movement of gases within their stems and rhizomes. Three types of pressurized (convective) flows have been identified: humidity-induced pressurization (positive pressure), thermal osmosis (positive pressure with air flow against the heat gradient), and venturi-induced suction (negative pressure) caused by wind passing over broken culms. A clear diel variation in pressurized flows exists, with higher pressures and flows during the day and negligible pressures and flows during the night. This article discusses some key aspects of these mechanisms for oxygen movement.
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Affiliation(s)
- G G Striker
- Facultad de Agronomía, IFEVA, Universidad de Buenos Aires, CONICET, -Buenos Aires, Argentina
- School of Agriculture and Environment, Faculty of Science, The University of Western Australia, Crawley, Western Australia, Australia
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14
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Cui L, Wang P, Che H, Gao X, Chen J, Liu B, Ao Y. Environmental energy enhanced solar-driven evaporator with spontaneous internal convection for highly efficient water purification. Water Res 2023; 244:120514. [PMID: 37657314 DOI: 10.1016/j.watres.2023.120514] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 08/12/2023] [Accepted: 08/20/2023] [Indexed: 09/03/2023]
Abstract
Solar-driven interfacial evaporation for water purification is limited by the structural design of the solar evaporator and, more importantly, by the inability to separate the water from volatile organic compounds (VOCs) present in the water source. Here, we report a three-dimensional (3D) bifunctional evaporator based on N-doped carbon (CoNC/CF), which enables the separation of fresh water from VOCs by activating PMS during the evaporation process with a VOC removal rate of 99%. There is abundant van der Waals interaction between peroxymonosulfate (PMS) and CoNC/CF, and pyrrolic N is confirmed as the active site for binding phenol, thus contributing to the separation of phenol from water. With the advantageous features of sufficient light absorption, adequate water storage capacity, and spontaneous internal convection flow on its top surface, the 3D evaporator achieves a high evaporation rate under one sun (1 kW/m2) at 3.16 kg/m2/h. More notably, through careful structural design, additional energy from the environment and water can be utilized. With such a high evaporation rate and satisfactory purification performance, this work is expected to provide a promising platform for wastewater treatment.
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Affiliation(s)
- Lingfang Cui
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1, Xikang road, Nanjing 210098, China
| | - Peifang Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1, Xikang road, Nanjing 210098, China
| | - Huinan Che
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1, Xikang road, Nanjing 210098, China
| | - Xin Gao
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1, Xikang road, Nanjing 210098, China
| | - Juan Chen
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1, Xikang road, Nanjing 210098, China
| | - Bin Liu
- Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR 999077, China
| | - Yanhui Ao
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1, Xikang road, Nanjing 210098, China.
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15
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Fei H, Ballmer MD, Faul U, Walte N, Cao W, Katsura T. Variation in bridgmanite grain size accounts for the mid-mantle viscosity jump. Nature 2023; 620:794-799. [PMID: 37407826 PMCID: PMC10447242 DOI: 10.1038/s41586-023-06215-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 05/12/2023] [Indexed: 07/07/2023]
Abstract
A viscosity jump of one to two orders of magnitude in the lower mantle of Earth at 800-1,200-km depth is inferred from geoid inversions and slab-subducting speeds. This jump is known as the mid-mantle viscosity jump1,2. The mid-mantle viscosity jump is a key component of lower-mantle dynamics and evolution because it decelerates slab subduction3, accelerates plume ascent4 and inhibits chemical mixing5. However, because phase transitions of the main lower-mantle minerals do not occur at this depth, the origin of the viscosity jump remains unknown. Here we show that bridgmanite-enriched rocks in the deep lower mantle have a grain size that is more than one order of magnitude larger and a viscosity that is at least one order of magnitude higher than those of the overlying pyrolitic rocks. This contrast is sufficient to explain the mid-mantle viscosity jump1,2. The rapid growth in bridgmanite-enriched rocks at the early stage of the history of Earth and the resulting high viscosity account for their preservation against mantle convection5-7. The high Mg:Si ratio of the upper mantle relative to chondrites8, the anomalous 142Nd:144Nd, 182W:184W and 3He:4He isotopic ratios in hot-spot magmas9,10, the plume deflection4 and slab stagnation in the mid-mantle3 as well as the sparse observations of seismic anisotropy11,12 can be explained by the long-term preservation of bridgmanite-enriched rocks in the deep lower mantle as promoted by their fast grain growth.
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Affiliation(s)
- Hongzhan Fei
- Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth, Germany.
- Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, School of Earth Sciences, Zhejiang University, Hangzhou, China.
| | - Maxim D Ballmer
- Department of Earth Sciences, University College London, London, UK
| | - Ulrich Faul
- Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Nicolas Walte
- Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Garching, Germany
| | - Weiwei Cao
- Conditions Extrêmes et Matériaux: Haute Température et Irradiation (CEMHTI), Orléans, France
| | - Tomoo Katsura
- Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth, Germany
- Center for High Pressure Science and Technology Advanced Research, Beijing, China
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16
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Michiels J, Vitale F. Design and Characterization of Pressure Monitoring and Insertion system for Intraparenchymal Convection Enhanced Delivery. Annu Int Conf IEEE Eng Med Biol Soc 2023; 2023:1-4. [PMID: 38082745 DOI: 10.1109/embc40787.2023.10341013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2023]
Abstract
Neurological disorders are a significant societal and economic burden. Common pharmacological therapies often can only manage symptoms and have limited efficacy. Intraparenchymal convection enhanced delivery (IP CED) is a neurosurgical technique for direct brain delivery of therapeutics. Currently, the main applications of IP CED are targeted chemotherapy for glioblastoma and gene therapy. While IP CED has advantages over systemic approaches, its benefits can be drastically reduced by inadequate coverage as low as 21% of target anatomy, excessive infusion durations greater than 2 hours, and off-target effects. Addressing the limitations of IP CED requires thorough investigation and optimization of the relevant fluid dynamic and operational parameters. In this work, we present the design, fabrication, and characterization of low-cost, open-source, and fully automated CED cannula insertion control and pressure-monitoring systems. Using these automated CED control systems, we investigate the effects of pressure, insertion velocity, and flow rates on several outcome variables, including reflux, volume distribution, and infusion cloud morphology during CED infusions in brain phantoms.Clinical Relevance- CED pressure properties may be able to implicate reflux incidents and could provide clinicians with valuable, real-time information regarding ongoing infusions without the need for costly medical imaging modalities.
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17
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Izadi M, Saleem A, Alshehri HM, Ambreen T, Karimdoost Yasuri A. Influence of Geometric Parameters on the Charging process of PCM in Semi-circular thermal storages for energy management. Environ Sci Pollut Res Int 2023; 30:59765-59780. [PMID: 37016252 DOI: 10.1007/s11356-023-26689-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 03/23/2023] [Indexed: 05/10/2023]
Abstract
The limitation of intermittent and irregular supply of the solar energy systems can be compensated through utilization of thermal energy storage systems. The design of an efficient latent heat thermal energy storage system plays a huge role in determining the overall performance. Therefore, this study aims to investigate the effect of geometric parameters such as thermal charger interspacing and inclination angle on the charging performance of a PCM (phase change material) inside a semi-circular enclosure with two charging sources (renewable heat sources). A numerical analysis is performed using the enthalpy-porosity method. The system performance is assessed in terms of dimensionless flow parameters such as Fourier number, Rayleigh number, and Stefan number. The study shows that the variation of Rayleigh number significantly influences the natural convection in the fluid zone of a PCM. An increase of Rayleigh number from 1e4 to 5e5 reduced the overall melting time by more than half. In addition, the thermal charger interspacing and inclination angle both showed considerable effect on the flow physics which can cause significant expedition/delay of the melting process.
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Affiliation(s)
- Mohsen Izadi
- Mechanical Engineering Department, Faculty of Engineering, Lorestan University, P.O. Box 68151-44316, Khorramabad, Iran.
| | - Arslan Saleem
- School of Engineering, Cardiff University, Cardiff, Wales, UK
| | - Hashim M Alshehri
- Department of Mathematics, Faculty of Science, King Abdulaziz University, Jeddah, 21521, Saudi Arabia
| | - Tehmina Ambreen
- Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield, England, UK
| | - Amir Karimdoost Yasuri
- Mechanical Engineering Department, Faculty of Engineering, Lorestan University, P.O. Box 68151-44316, Khorramabad, Iran
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18
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Sariano PA, Mizenko RR, Shirure VS, Brandt AK, Nguyen BB, Nesiri C, Shergill BS, Brostoff T, Rocke DM, Borowsky AD, Carney RP, George SC. Convection and extracellular matrix binding control interstitial transport of extracellular vesicles. J Extracell Vesicles 2023; 12:e12323. [PMID: 37073802 PMCID: PMC10114097 DOI: 10.1002/jev2.12323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 03/06/2023] [Accepted: 03/29/2023] [Indexed: 04/20/2023] Open
Abstract
Extracellular vesicles (EVs) influence a host of normal and pathophysiological processes in vivo. Compared to soluble mediators, EVs can traffic a wide range of proteins on their surface including extracellular matrix (ECM) binding proteins, and their large size (∼30-150 nm) limits diffusion. We isolated EVs from the MCF10 series-a model human cell line of breast cancer progression-and demonstrated increasing presence of laminin-binding integrins α3β1 and α6β1 on the EVs as the malignant potential of the MCF10 cells increased. Transport of the EVs within a microfluidic device under controlled physiological interstitial flow (0.15-0.75 μm/s) demonstrated that convection was the dominant mechanism of transport. Binding of the EVs to the ECM enhanced the spatial concentration and gradient, which was mitigated by blocking integrins α3β1 and α6β1. Our studies demonstrate that convection and ECM binding are the dominant mechanisms controlling EV interstitial transport and should be leveraged in nanotherapeutic design.
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Affiliation(s)
- Peter A. Sariano
- Department of Biomedical EngineeringUniversity of CaliforniaDavisCaliforniaUSA
| | - Rachel R. Mizenko
- Department of Biomedical EngineeringUniversity of CaliforniaDavisCaliforniaUSA
| | - Venktesh S. Shirure
- Department of Biomedical EngineeringUniversity of CaliforniaDavisCaliforniaUSA
| | - Abigail K. Brandt
- Department of Biomedical EngineeringUniversity of CaliforniaDavisCaliforniaUSA
| | - Bryan B. Nguyen
- Department of Biomedical EngineeringUniversity of CaliforniaDavisCaliforniaUSA
| | - Cem Nesiri
- Department of Biomedical EngineeringUniversity of CaliforniaDavisCaliforniaUSA
| | | | - Terza Brostoff
- Department of Biomedical EngineeringUniversity of CaliforniaDavisCaliforniaUSA
- Department of PathologyUniversity of CaliforniaSan DiegoCaliforniaUSA
| | - David M. Rocke
- Department of Biomedical EngineeringUniversity of CaliforniaDavisCaliforniaUSA
- Department of Public Health Sciences, Division of BiostatisticsUniversity of CaliforniaDavisCaliforniaUSA
| | - Alexander D. Borowsky
- Department of Pathology and Laboratory MedicineUniversity of CaliforniaDavis, SacramentoCaliforniaUSA
| | - Randy P. Carney
- Department of Biomedical EngineeringUniversity of CaliforniaDavisCaliforniaUSA
| | - Steven C. George
- Department of Biomedical EngineeringUniversity of CaliforniaDavisCaliforniaUSA
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19
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Sahu MK, Gorai VK, Saha BC. Applications of extended surfaces for improvement in the performance of solar air heaters-a detailed systematic review. Environ Sci Pollut Res Int 2023; 30:54429-54447. [PMID: 36964804 DOI: 10.1007/s11356-023-26360-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Accepted: 03/05/2023] [Indexed: 06/18/2023]
Abstract
The objective of this research article is to present a comprehensive review of the work carried out to improve the thermal as well exergetic performance of the conventional smooth absorber plate solar air heater (SAH) duct by the use of the various configurations and arrangements of extended surfaces (fins) for the forced convection. In the SAH duct, these extended surfaces are attached along the air-flow path on the top absorber, on the bottom plate, or on the both plate surfaces. It enhances the performance of the conventional SAH by increasing the surface area and makes flow turbulent by their presence. Several experimental, theoretical, and simulation works, which have been performed by the researchers by utilizing the extended surfaces to improve the thermal efficiency based on first law of thermodynamics, exergy, and entropy generation analysis on the basis of the second law of thermodynamics for SAH ducts, have been included in the present article. Subsequently, an effort has been made to calculate the Nusselt number and friction factor by using the correlations reported by the researchers for comparing the performance of different configurations of fin SAHs. This comprehensive review article will be useful for the investigators and researchers who are working in the area of extended surface SAHs.
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Affiliation(s)
- Mukesh Kumar Sahu
- Department of Mechanical Engineering, Cambridge Institute of Technology, Ranchi, Jharkhand, India.
| | - Vikash Kumar Gorai
- Department of Mechanical Engineering, Cambridge Institute of Technology, Ranchi, Jharkhand, India
| | - Bikash Chandra Saha
- Department of Electrical and Electronics Engineering, Cambridge Institute of Technology, Ranchi, Jharkhand, India
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20
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Heinrich M, Voisiat B, Lasagni AF, Schwarze R. Numerical simulation of periodic surface structures created by direct laser interference patterning. PLoS One 2023; 18:e0282266. [PMID: 36848335 PMCID: PMC9970090 DOI: 10.1371/journal.pone.0282266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Accepted: 02/11/2023] [Indexed: 03/01/2023] Open
Abstract
Surface structuring using nano-second lasers can be used to enhance certain properties of a material or even to introduce new ones. One way to create these structures efficiently is direct laser interference patterning using different polarization vector orientations of the interfering beams. However, experimentally measuring the fabrication process of these structures is very challenging due to small length and time scales. Therefore, a numerical model is developed and presented for resolving the physical effects during formation the predicting the resolidified surface structures. This three-dimensional, compressible computational fluid dynamics model considers the gas, liquid, and solid material phase and includes various physical effects, such as heating due to the laser beam for both parallel and radial polarization vector orientations, melting, solidification, and evaporation, Marangoni convection, and volumetric expansion. The numerical results reveal a very good qualitatively and quantitatively agreement with experimental reference data. Resolidified surface structures match both in overall shape as well as crater diameter and height, respectively. Furthermore, this model gives valuable insight on different quantities during the formation of these surface structures, such as velocity and temperature. In future, this model can be used to predict surface structures based on various process input parameters.
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Affiliation(s)
- Martin Heinrich
- Institute of Mechanics and Fluiddynamics, Technical University Freiberg, Freiberg, Germany
- * E-mail:
| | - Bogdan Voisiat
- Institute of Manufacturing Science and Engineering, Technische Universität Dresden, Dresden, Germany
| | - Andrés Fabián Lasagni
- Institute of Manufacturing Science and Engineering, Technische Universität Dresden, Dresden, Germany
- Fraunhofer Institute for Material and Beam Technology IWS, Dresden, Germany
| | - Rüdiger Schwarze
- Institute of Mechanics and Fluiddynamics, Technical University Freiberg, Freiberg, Germany
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21
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Gernert M, MacKeigan D, Deking L, Kaczmarek E, Feja M. Acute and chronic convection-enhanced muscimol delivery into the rat subthalamic nucleus induces antiseizure effects associated with high responder rates. Epilepsy Res 2023; 190:107097. [PMID: 36736200 DOI: 10.1016/j.eplepsyres.2023.107097] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 01/13/2023] [Accepted: 01/23/2023] [Indexed: 01/27/2023]
Abstract
Intracerebral drug delivery is an emerging treatment strategy aiming to manage seizures in patients with systemic drug-resistant epilepsies. In rat seizure and epilepsy models, the GABAA receptor agonist muscimol has shown powerful antiseizure potential when injected acutely into the subthalamic nucleus (STN), known for its capacity to provide remote control of different seizure types. However, chronic intrasubthalamic muscimol delivery required for long-term seizure suppression has not yet been investigated. We tested the hypothesis that chronic convection-enhanced delivery (CED) of muscimol into the STN produces long-lasting antiseizure effects in the intravenous pentylenetetrazole seizure threshold test in female rats. Acute microinjection was included to verify efficacy of intrasubthalamic muscimol delivery in this seizure model and caused significant antiseizure effects at 30 and 60 ng per hemisphere with a dose-dependent increase of responders and efficacy and only mild adverse effects compared to controls. For the chronic study, muscimol was bilaterally infused into the STN over three weeks at daily doses of 60, 300, or 600 ng per hemisphere using an implantable pump and cannula system. Chronic intrasubthalamic CED of muscimol caused significant long-lasting antiseizure effects for up to three weeks at 300 and 600 ng daily. Drug responder rate increased dose-dependently, as did drug tolerance rates. Transient ataxia and body weight loss were the main adverse effects. Drug distribution was comparable (about 2-3 mm) between acute and chronic delivery. This is the first study providing proof-of-concept that not only acute, but also chronic, continuous CED of muscimol into the STN raises seizure thresholds.
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Affiliation(s)
- Manuela Gernert
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, Bünteweg 17, D-30559 Hannover, Germany; Center for Systems Neuroscience, University of Veterinary Medicine Hannover, Bünteweg 2, D-30559 Hannover, Germany.
| | - Devlin MacKeigan
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, Bünteweg 17, D-30559 Hannover, Germany; Center for Systems Neuroscience, University of Veterinary Medicine Hannover, Bünteweg 2, D-30559 Hannover, Germany
| | - Lillian Deking
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, Bünteweg 17, D-30559 Hannover, Germany
| | - Edith Kaczmarek
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, Bünteweg 17, D-30559 Hannover, Germany
| | - Malte Feja
- Department of Pharmacology, Toxicology, and Pharmacy, University of Veterinary Medicine Hannover, Bünteweg 17, D-30559 Hannover, Germany; Center for Systems Neuroscience, University of Veterinary Medicine Hannover, Bünteweg 2, D-30559 Hannover, Germany.
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22
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Kanimozhi B, Muthtamilselvan M, Al-Mdallal Q. Marangoni convection in a hybrid nanofluid-filled cylindrical annular enclosure with sinusoidal temperature distribution. Eur Phys J E Soft Matter 2023; 46:1. [PMID: 36637683 DOI: 10.1140/epje/s10189-022-00253-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Accepted: 11/30/2022] [Indexed: 06/17/2023]
Abstract
The current research numerically investigates the Marangoni convection in a cylindrical annulus filled with hybrid nanofluid saturated porous media. The interior and exterior walls are subjected to spatially varying sinusoidal thermal distributions with various amplitude ratios and phase deviations. The limits at the top and bottom are adiabatic. To solve the system of non-dimensional governing equations, the finite difference approach is applied. The main objective of the ongoing study is to investigate the impact of the Marangoni number, nanoparticle volume fraction and the radii ratio on the amplitude ratio and phase deviation. Also, the fluid flow, thermal characteristics, local and average Nusselt numbers are analysed in the hybrid nanofluid-filled vertical cylindrical annulus with magnetic effects. The findings indicate that the sinusoidal temperature promotes multicellular flow in the porous annular region. In the annulus with sinusoidal boundaries, the Marangoni number underperforms while the nanoparticle volume fraction outperforms.
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Affiliation(s)
- B Kanimozhi
- Department of Mathematics, Bharathiar University, Coimbatore, Tamilnadu, 641 046, India
| | - M Muthtamilselvan
- Department of Mathematics, Bharathiar University, Coimbatore, Tamilnadu, 641 046, India.
| | - Qasem Al-Mdallal
- Department of Mathematical Sciences, United Arab Emirates University, 15551, Al-Ain, United Arab Emirates
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23
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Elangovan E, Natarajan SK. Convective and evaporative heat transfer coefficients during drying of ivy gourd under natural and forced convection solar dryer. Environ Sci Pollut Res Int 2023; 30:10469-10483. [PMID: 36074290 DOI: 10.1007/s11356-022-22865-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Accepted: 08/30/2022] [Indexed: 06/15/2023]
Abstract
In the present work, a study on convective heat, mass transfer coefficients and evaporative heat transfer coefficient of the thin layer drying process of ivy gourd is performed. The experiment was conducted in three drying modes such as natural, forced convection solar dryer and open sun drying. The hourly data for the rate of moisture removal, sample temperature, relative humidity inside and outside the solar and ambient air temperature for complete drying have been recorded. The drying air temperature varied from 55, 65, 70 and 75 °C, and the air velocity was 1, 1.5 and 2 m/s. All the drying experiments had shown a falling rate period. The data obtained from experimentation have been used to evaluate the experimental constant values of C and n by simple regression analysis. Based on the values of "C" and "n", convective and evaporative heat transfer coefficients for ivy gourd were determined. The average convective heat and mass transfer coefficients varied between 2.64 and 8.30 W/m2 °C and 0.0025 to 0.0076 m/s for temperature ranges, at the different air velocities, respectively. The average evaporative heat transfer coefficient for ivy gourd varied from 181.89 to 421.84 W/m2 °C. It was observed that convective and evaporative heat transfer coefficients increase with the increase in drying air temperature. The rate of increment of evaporative heat transfer coefficient is higher than the convective heat transfer coefficient. The intensity of heat and mass transfer during solar drying depends on the drying air temperature and velocity.
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Affiliation(s)
- Elavarasan Elangovan
- Department of Aerospace Engineering, SJC Institute of Technology, Chikkaballapur, Karnataka, 562101, India
| | - Sendhil Kumar Natarajan
- Department of Mechanical Engineering, National Institute of Technology Puducherry, Karaikal, U.T of Puducherry, India.
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24
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Elangovan E, Natarajan SK. Study of activation energy and moisture diffusivity of various dipping solutions of ivy gourd using solar dryer. Environ Sci Pollut Res Int 2023; 30:996-1010. [PMID: 35907071 DOI: 10.1007/s11356-022-22248-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 07/22/2022] [Indexed: 06/15/2023]
Abstract
The study is aimed to enhance the shelf life of ivy gourd through the solar drying method in open, forced, and natural convection mode. Ivy gourd is treated as the primary agent to prepare medicines and the stems, leaves and flowers are used to cure diseases related to diabetics, ulcer and skin. The normal shelf life is 2-3 days and it can be increased up to 6 months with an effective drying process. The experiment is intended to find the best drying process among the open, natural, and forced convection mode with an initial dipping method with ascorbic acid, lemon juice, sugar solution, honey solutions individually, and a control sample (without dipping). A 3 kg sample of ivy gourd is dipped in 10 g/L of each of the solutions and it is used for the three drying processes individually. The obtained results are indicating that the forced convection method for ascorbic acid is best among the other drying method, with the highest moisture diffusivity is 7.88 × 10-8 m2/s and the lowest activation energy of 21.12 kJ/mol. The lemon juice sample is found to have better sensory appeal in terms of colour (darkness) and shrinkage followed by honey, ascorbic acid, and control sample, whereas the honey-dipped sample offers a better taste followed by lemon juice-dipped samples, control, and ascorbic acid-dipped samples, respectively. The influence of dipping solution and drying mechanisms on the functionalities of drying are discussed with suitable illustrations.
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Affiliation(s)
- Elavarasan Elangovan
- Department of Mechanical Engineering, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, 602105, Tamil Nadu, India
| | - Sendhil Kumar Natarajan
- Department of Mechanical Engineering, National Institute of Technology Puducherry, Karaikal, U.T of Puducherry, Karaikal, India.
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25
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Sánchez Umbría J, Net M. Thermal convection in rotating spherical geometry: A numerical overview of the transitions from periodic axisymmetric to temporally complex three-dimensional flows. Phys Rev E 2022; 106:065102. [PMID: 36671147 DOI: 10.1103/physreve.106.065102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Accepted: 11/30/2022] [Indexed: 06/17/2023]
Abstract
The aim of this work is to elucidate the type of transitions that take place when the periodic axisymmetric flows, which can set up at the onset of thermal convection in rotating fluid spheres, lose stability and to study the behavior of the new stable velocity fields until the flows become temporally chaotic. The computations for Prandtl numbers Pr=0.715, 0.1, and 0.01 show that when it decreases, the range of stability of these flows becomes narrower because the kinetic energy of the axisymmetric periodic solutions increases very fast, favoring their instability. From the stability analysis and direct three-dimensional simulations it is found that the transition to stable quasiperiodic flows through Neimark-Sacker bifurcations is supercritical when Pr≥0.01. For Pr=0.1 two branches of stable periodic flows emerging from the conduction state have been found due to the proximity to a double Hopf bifurcation. However, only the branches bifurcating from the azimuthal rotating waves are stable at large Rayleigh numbers. Far from this bifurcation the stable flows keep the influence of the axisymmetric dynamics up to large Rayleigh numbers. For small Pr they behave as repeated transients of mixed dynamics, controlled by the azimuthal wave numbers m=0, m=1, and m=2.
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Affiliation(s)
- J Sánchez Umbría
- Physics Department, Universitat Politècnica de Catalunya, Campus Nord, Mòdul B4, 08034 Barcelona, Spain
| | - M Net
- Physics Department, Universitat Politècnica de Catalunya, Campus Nord, Mòdul B4, 08034 Barcelona, Spain
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26
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Bakarji J, Callaham J, Brunton SL, Kutz JN. Dimensionally consistent learning with Buckingham Pi. Nat Comput Sci 2022; 2:834-844. [PMID: 38177386 DOI: 10.1038/s43588-022-00355-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 10/12/2022] [Indexed: 01/06/2024]
Abstract
In the absence of governing equations, dimensional analysis is a robust technique for extracting insights and finding symmetries in physical systems. Given measurement variables and parameters, the Buckingham Pi theorem provides a procedure for finding a set of dimensionless groups that spans the solution space, although this set is not unique. We propose an automated approach using the symmetric and self-similar structure of available measurement data to discover the dimensionless groups that best collapse these data to a lower dimensional space according to an optimal fit. We develop three data-driven techniques that use the Buckingham Pi theorem as a constraint: (1) a constrained optimization problem with a non-parametric input-output fitting function, (2) a deep learning algorithm (BuckiNet) that projects the input parameter space to a lower dimension in the first layer and (3) a technique based on sparse identification of nonlinear dynamics to discover dimensionless equations whose coefficients parameterize the dynamics. We explore the accuracy, robustness and computational complexity of these methods and show that they successfully identify dimensionless groups in three example problems: a bead on a rotating hoop, a laminar boundary layer and Rayleigh-Bénard convection.
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Affiliation(s)
- Joseph Bakarji
- Department of Mechanical Engineering, University of Washington, Seattle, WA, USA.
| | - Jared Callaham
- Department of Mechanical Engineering, University of Washington, Seattle, WA, USA.
| | - Steven L Brunton
- Department of Mechanical Engineering, University of Washington, Seattle, WA, USA.
| | - J Nathan Kutz
- Department of Applied Mathematics, University of Washington, Seattle, WA, USA.
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27
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Spinazzi EF, Argenziano MG, Upadhyayula PS, Banu MA, Neira JA, Higgins DMO, Wu PB, Pereira B, Mahajan A, Humala N, Al-Dalahmah O, Zhao W, Save AV, Gill BJA, Boyett DM, Marie T, Furnari JL, Sudhakar TD, Stopka SA, Regan MS, Catania V, Good L, Zacharoulis S, Behl M, Petridis P, Jambawalikar S, Mintz A, Lignelli A, Agar NYR, Sims PA, Welch MR, Lassman AB, Iwamoto FM, D'Amico RS, Grinband J, Canoll P, Bruce JN. Chronic convection-enhanced delivery of topotecan for patients with recurrent glioblastoma: a first-in-patient, single-centre, single-arm, phase 1b trial. Lancet Oncol 2022; 23:1409-1418. [PMID: 36243020 PMCID: PMC9641975 DOI: 10.1016/s1470-2045(22)00599-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Revised: 09/14/2022] [Accepted: 09/16/2022] [Indexed: 11/06/2022]
Abstract
BACKGROUND Topotecan is cytotoxic to glioma cells but is clinically ineffective because of drug delivery limitations. Systemic delivery is limited by toxicity and insufficient brain penetrance, and, to date, convection-enhanced delivery (CED) has been restricted to a single treatment of restricted duration. To address this problem, we engineered a subcutaneously implanted catheter-pump system capable of repeated, chronic (prolonged, pulsatile) CED of topotecan into the brain and tested its safety and biological effects in patients with recurrent glioblastoma. METHODS We did a single-centre, open-label, single-arm, phase 1b clinical trial at Columbia University Irving Medical Center (New York, NY, USA). Eligible patients were at least 18 years of age with solitary, histologically confirmed recurrent glioblastoma showing radiographic progression after surgery, radiotherapy, and chemotherapy, and a Karnofsky Performance Status of at least 70. Five patients had catheters stereotactically implanted into the glioma-infiltrated peritumoural brain and connected to subcutaneously implanted pumps that infused 146 μM topotecan 200 μL/h for 48 h, followed by a 5-7-day washout period before the next infusion, with four total infusions. After the fourth infusion, the pump was removed and the tumour was resected. The primary endpoint of the study was safety of the treatment regimen as defined by presence of serious adverse events. Analyses were done in all treated patients. The trial is closed, and is registered with ClinicalTrials.gov, NCT03154996. FINDINGS Between Jan 22, 2018, and July 8, 2019, chronic CED of topotecan was successfully completed safely in all five patients, and was well tolerated without substantial complications. The only grade 3 adverse event related to treatment was intraoperative supplemental motor area syndrome (one [20%] of five patients in the treatment group), and there were no grade 4 adverse events. Other serious adverse events were related to surgical resection and not the study treatment. Median follow-up was 12 months (IQR 10-17) from pump explant. Post-treatment tissue analysis showed that topotecan significantly reduced proliferating tumour cells in all five patients. INTERPRETATION In this small patient cohort, we showed that chronic CED of topotecan is a potentially safe and active therapy for recurrent glioblastoma. Our analysis provided a unique tissue-based assessment of treatment response without the need for large patient numbers. This novel delivery of topotecan overcomes limitations in delivery and treatment response assessment for patients with glioblastoma and could be applicable for other anti-glioma drugs or other CNS diseases. Further studies are warranted to determine the effect of this drug delivery approach on clinical outcomes. FUNDING US National Institutes of Health, The William Rhodes and Louise Tilzer Rhodes Center for Glioblastoma, the Michael Weiner Glioblastoma Research Into Treatment Fund, the Gary and Yael Fegel Foundation, and The Khatib Foundation.
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Affiliation(s)
- Eleonora F Spinazzi
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY, USA
| | - Michael G Argenziano
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY, USA
| | - Pavan S Upadhyayula
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY, USA
| | - Matei A Banu
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY, USA
| | - Justin A Neira
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY, USA
| | - Dominique M O Higgins
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY, USA
| | - Peter B Wu
- Department of Neurological Surgery, UCLA Geffen School of Medicine, Los Angeles, CA, USA
| | - Brianna Pereira
- Department of Pathology and Cell Biology, Columbia University Irving Medical Center, New York, NY, USA
| | - Aayushi Mahajan
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY, USA
| | - Nelson Humala
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY, USA
| | - Osama Al-Dalahmah
- Department of Pathology and Cell Biology, Columbia University Irving Medical Center, New York, NY, USA
| | - Wenting Zhao
- Department of System Biology, Columbia University Irving Medical Center, New York, NY, USA
| | - Akshay V Save
- Department of Neurological Surgery, NYU Grossman School of Medicine, New York, NY, USA
| | - Brian J A Gill
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY, USA
| | - Deborah M Boyett
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY, USA
| | - Tamara Marie
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY, USA
| | - Julia L Furnari
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY, USA
| | - Tejaswi D Sudhakar
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY, USA
| | - Sylwia A Stopka
- Department of Neurosurgery and Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Michael S Regan
- Department of Neurosurgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Vanessa Catania
- Department of Neurosurgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Laura Good
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY, USA
| | - Stergios Zacharoulis
- Department of Pediatrics, Columbia University Irving Medical Center, New York, NY, USA
| | - Meenu Behl
- Department of Radiology, Columbia University Irving Medical Center, New York, NY, USA
| | - Petros Petridis
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY, USA
| | - Sachin Jambawalikar
- Department of Radiology, Columbia University Irving Medical Center, New York, NY, USA
| | - Akiva Mintz
- Department of Radiology, Columbia University Irving Medical Center, New York, NY, USA
| | - Angela Lignelli
- Department of Radiology, Columbia University Irving Medical Center, New York, NY, USA
| | - Nathalie Y R Agar
- Department of Neurosurgery and Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA; Department of Cancer Biology, Dana-Farber Cancer Institute Boston, MA, USA
| | - Peter A Sims
- Department of System Biology, Columbia University Irving Medical Center, New York, NY, USA
| | - Mary R Welch
- Division of Neuro-Oncology, Department of Neurology and the Herbert Irving Comprehensive Cancer Center, Columbia University Vagelos College of Physicians and Surgeons and New York-Presbyterian Hospital, New York, NY, USA
| | - Andrew B Lassman
- Division of Neuro-Oncology, Department of Neurology and the Herbert Irving Comprehensive Cancer Center, Columbia University Vagelos College of Physicians and Surgeons and New York-Presbyterian Hospital, New York, NY, USA
| | - Fabio M Iwamoto
- Division of Neuro-Oncology, Department of Neurology and the Herbert Irving Comprehensive Cancer Center, Columbia University Vagelos College of Physicians and Surgeons and New York-Presbyterian Hospital, New York, NY, USA
| | - Randy S D'Amico
- Department of Neurosurgery, Lenox Hill Hospital, New York, NY, USA
| | - Jack Grinband
- Department of Radiology, Columbia University Irving Medical Center, New York, NY, USA; Department of Psychiatry, Columbia University Irving Medical Center, New York, NY, USA
| | - Peter Canoll
- Department of Pathology and Cell Biology, Columbia University Irving Medical Center, New York, NY, USA
| | - Jeffrey N Bruce
- Department of Neurological Surgery, Columbia University Irving Medical Center, New York, NY, USA.
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28
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Mehta JN, Morales BE, Hsu FC, Rossmeisl JH, Rylander CG. Constant Pressure Convection-Enhanced Delivery Increases Volume Dispersed With Catheter Movement in Agarose. J Biomech Eng 2022; 144:111003. [PMID: 35656789 PMCID: PMC9254693 DOI: 10.1115/1.4054729] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Revised: 04/27/2022] [Indexed: 11/08/2022]
Abstract
Convection-enhanced delivery (CED) has been extensively studied for drug delivery to the brain due to its inherent ability to bypass the blood-brain barrier. Unfortunately, CED has also been shown to inadequately distribute therapeutic agents over a large enough targeted tissue volume to be clinically beneficial. In this study, we explore the use of constant pressure infusions in addition to controlled catheter movement as a means to increase volume dispersed (Vd) in an agarose gel brain tissue phantom. Constant flow rate and constant pressure infusions were conducted with a stationary catheter, a catheter retracting at a rate of 0.25 mm/min, and a catheter retracting at a rate of 0.5 mm/min. The 0.25 mm/min and 0.5 mm/min retracting constant pressure catheters resulted in significantly larger Vd compared to any other group, with a 105% increase and a 155% increase compared to the stationary constant flow rate catheter, respectively. These same constant pressure retracting infusions resulted in a 42% and 45% increase in Vd compared to their constant flow rate counterparts. Using constant pressure infusions coupled with controlled catheter movement appears to have a beneficial effect on Vd in agarose gel. Furthermore, constant pressure infusions reveal the fundamental limitation of flow-driven infusions in both controlled catheter movement protocols as well as in stationary protocols where maximum infusion volume can never be reliably obtained.
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Affiliation(s)
- Jason N. Mehta
- Walker Department of Mechanical Engineering, University of Texas at Austin, 204 E. Dean Keeton Street, Stop C2200, Austin, TX, 78712-1591
| | - Brianna E. Morales
- Department of Biomedical Engineering, University of Texas at Austin, 301 E. Dean Keeton St. C2100, Austin, TX, 78712-2100
| | - Fang-Chi Hsu
- Department of Biostatistics and Data Science, Division of Public Health Sciences, Wake Forest University School of Medicine Medical, Center Boulevard, Winston-Salem, NC 27157
| | - John H. Rossmeisl
- Department of Small Animal Clinical Sciences, VA-MD College of Veterinary Medicine, Virginia Tech, 205 Duckpond Drive, Blacksburg, VA 24061
| | - Christopher G. Rylander
- Walker Department of Mechanical Engineering, University of Texas at Austin, 204 E. Dean Keeton Street, Stop C2200, Austin, TX, 78712-1591
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29
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Mehta JN, Rausch MK, Rylander CG. Convection-enhanced delivery with controlled catheter movement: A parametric finite element analysis. Int J Numer Method Biomed Eng 2022; 38:e3635. [PMID: 35763587 PMCID: PMC9516958 DOI: 10.1002/cnm.3635] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 05/12/2022] [Accepted: 06/26/2022] [Indexed: 06/15/2023]
Abstract
Convection-enhanced delivery (CED) is an investigational method for delivering therapeutics directly to the brain for the treatment of glioblastoma. However, it has not become a common clinical therapy due to an inability of CED treatments to deliver therapeutics in a large enough tissue volume to fully saturate the target region. We have recently shown that the combination of controlled catheter movement and constant pressure infusions can be used to significantly increase volume dispersed (Vd ) in an agarose gel brain tissue phantom. In the present study, we develop a computational model to predict Vd achieved by various retraction rates with both constant pressure and constant flow rate infusions. An increase in Vd is achieved with any movement rate, but increase in Vd between successive movement rates drops off at rates above 0.3-0.35 mm/min. Finally, we found that infusions with retraction result in a more even distribution in concentration level compared to the stationary catheter, suggesting a potential increased ability for moving catheters to have a therapeutic impact regardless of the required therapeutic concentration level.
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Affiliation(s)
- Jason N. Mehta
- Department of Mechanical Engineering, University of Texas at Austin, Austin, Texas, USA
| | - Manuel K. Rausch
- Department of Aerospace Engineering and Engineering Mechanics, University of Texas at Austin, Austin, Texas, USA
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30
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Koklu A, Wustoni S, Guo K, Silva R, Salvigni L, Hama A, Diaz-Galicia E, Moser M, Marks A, McCulloch I, Grünberg R, Arold ST, Inal S. Convection Driven Ultrarapid Protein Detection via Nanobody-Functionalized Organic Electrochemical Transistors. Adv Mater 2022; 34:e2202972. [PMID: 35772173 DOI: 10.1002/adma.202202972] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 06/15/2022] [Indexed: 06/15/2023]
Abstract
Conventional biosensors rely on the diffusion-dominated transport of the target analyte to the sensor surface. Consequently, they require an incubation step that may take several hours to allow for the capture of analyte molecules by sensor biorecognition sites. This incubation step is a primary cause of long sample-to-result times. Here, alternating current electrothermal flow (ACET) is integrated in an organic electrochemical transistor (OECT)-based sensor to accelerate the device operation. ACET is applied to the gate electrode functionalized with nanobody-SpyCatcher fusion proteins. Using the SARS-CoV-2 spike protein in human saliva as an example target, it is shown that ACET enables protein recognition within only 2 min of sample exposure, supporting its use in clinical practice. The ACET integrated sensor exhibits better selectivity, higher sensitivity, and lower limit of detection than the equivalent sensor with diffusion-dominated operation. The performance of ACET integrated sensors is compared with two types of organic semiconductors in the channel and grounds for device-to-device variations are investigated. The results provide guidelines for the channel material choice in OECT-based biochemical sensors, and demonstrate that ACET integration substantially decreases the detection speed while increasing the sensitivity and selectivity of transistor-based sensors.
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Affiliation(s)
- Anil Koklu
- Organic Bioelectronics Laboratory, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
- Biological and Environmental Science and Engineering Division, Computational Bioscience Research Center (CBRC), KAUST, Thuwal, Saudi Arabia
| | - Shofarul Wustoni
- Organic Bioelectronics Laboratory, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
- Biological and Environmental Science and Engineering Division, Computational Bioscience Research Center (CBRC), KAUST, Thuwal, Saudi Arabia
| | - Keying Guo
- Organic Bioelectronics Laboratory, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
- Biological and Environmental Science and Engineering Division, Computational Bioscience Research Center (CBRC), KAUST, Thuwal, Saudi Arabia
| | - Raphaela Silva
- Organic Bioelectronics Laboratory, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
- Biological and Environmental Science and Engineering Division, Computational Bioscience Research Center (CBRC), KAUST, Thuwal, Saudi Arabia
| | - Luca Salvigni
- Organic Bioelectronics Laboratory, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
- Biological and Environmental Science and Engineering Division, Computational Bioscience Research Center (CBRC), KAUST, Thuwal, Saudi Arabia
| | - Adel Hama
- Organic Bioelectronics Laboratory, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
- Biological and Environmental Science and Engineering Division, Computational Bioscience Research Center (CBRC), KAUST, Thuwal, Saudi Arabia
| | - Escarlet Diaz-Galicia
- Biological and Environmental Science and Engineering Division, Computational Bioscience Research Center (CBRC), KAUST, Thuwal, Saudi Arabia
| | - Maximilian Moser
- Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
| | - Adam Marks
- Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
| | - Iain McCulloch
- Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
| | - Raik Grünberg
- Biological and Environmental Science and Engineering Division, Computational Bioscience Research Center (CBRC), KAUST, Thuwal, Saudi Arabia
| | - Stefan T Arold
- Biological and Environmental Science and Engineering Division, Computational Bioscience Research Center (CBRC), KAUST, Thuwal, Saudi Arabia
- Centre de Biologie Structurale (CBS), INSERM, CNRS, Université de Montpellier, Montpellier, F-34090, France
| | - Sahika Inal
- Organic Bioelectronics Laboratory, Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
- Biological and Environmental Science and Engineering Division, Computational Bioscience Research Center (CBRC), KAUST, Thuwal, Saudi Arabia
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31
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Sęczyk Ł, Ozdemir FA, Kołodziej B. In vitro bioaccessibility and activity of basil (Ocimum basilicum L.) phytochemicals as affected by cultivar and postharvest preservation method - Convection drying, freezing, and freeze-drying. Food Chem 2022; 382:132363. [PMID: 35158270 DOI: 10.1016/j.foodchem.2022.132363] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 02/01/2022] [Accepted: 02/03/2022] [Indexed: 11/17/2022]
Abstract
The effects of convection drying, freezing, and freeze-drying, on phytochemicals content, in vitro activity and bioaccessibility of sweet basil, cinnamon basil, red rubin basil, and lemon basil were investigated. For evaluation of bioaccessibility, rosmarinic acid content, phenolic content, and antioxidant potential of samples before and after gastric and intestinal steps of digestion were determined. Results showed that the content, activity and bioaccessibility of basil phytochemicals varied depending on the cultivar as well as the applied postharvest preservation. It was found that the frozen and freeze-dried plant materials were characterized by a higher phenolic level and antioxidant activity compared to the convection dried. However, in general, convection drying allows obtaining samples with higher bioaccessibility of phytochemicals compared to the low-temperature processed samples. These findings highlight the need for evaluation of basil cultivars and postharvest preservation methods regarding phytochemicals bioaccessibility, which might help in the classification in terms of pro-health quality.
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Affiliation(s)
- Łukasz Sęczyk
- Department of Industrial and Medicinal Plants, University of Life Sciences in Lublin, 15 Akademicka Str., 20-950 Lublin, Poland.
| | - Fethi Ahmet Ozdemir
- Department of Molecular Biology and Genetics, Faculty of Science and Art, Bingol University, Bingol 1200, Turkey.
| | - Barbara Kołodziej
- Department of Industrial and Medicinal Plants, University of Life Sciences in Lublin, 15 Akademicka Str., 20-950 Lublin, Poland.
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Kaddoura MF, Wright NC. Optimization of convection-enhanced evaporation (CEE) using generalized cost ratios. Water Res 2022; 219:118491. [PMID: 35623102 DOI: 10.1016/j.watres.2022.118491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 04/19/2022] [Accepted: 04/20/2022] [Indexed: 06/15/2023]
Abstract
Brine is a byproduct of desalination plants and several industrial processes which can have an adverse impact on the environment if not managed properly. Conventional brine management technologies are energy intensive and costly which limit their adoption. This study presents the first cost optimization of convection-enhanced evaporation (CEE) system to achieve a modular, cost-effective brine management and on-site treatment option for decentralized desalination plants and small-volume industries. CEE involves evaporating water from saline liquid films, released on evaporation surfaces, by the difference in vapor pressure created by forced air convection. The optimization identifies the optimal operating settings (brine flow rates, brine temperatures, and air speeds) and enables comprehensive investigation of the effect of various operational decisions on operating (energy) cost, capital cost, and footprint area. The objective functions are formulated using two cost ratios that relate material, thermal, and electrical energy costs, effectively generalizing the optimization results to be independent of location-specific cost parameters. The optimization reveals two distinct operation modes, "all-electric mode" and "heating mode". The "all-electric mode" corresponds to a lower total specific cost, ranging from $1.4 to $5 per m3, and higher footprint area, ranging from 0.5 to 1.8 m2 per m3 of evaporated volume. The "heating mode" corresponds to a higher total specific cost, up to $6.5 per m3; at low energy cost ratios, a compact footprint area ranging from 0.072 to 0.5 m2 per m3 of evaporated volume is achieved. Proposed designs were found to have lower costs than technologies available in the literature.
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Affiliation(s)
- Mustafa F Kaddoura
- Department of Mechanical Engineering, University of Minnesota, 111 Church Street SE, Minneapolis, MN 55455, USA.
| | - Natasha C Wright
- Department of Mechanical Engineering, University of Minnesota, 111 Church Street SE, Minneapolis, MN 55455, USA
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Dang Q, Song M, Dang C, Zhan T, Zhang L. Experimental Study on Solidification Characteristics of Sessile Urine Droplets on a Horizontal Cold Plate Surface under Natural Convection. Langmuir 2022; 38:7846-7857. [PMID: 35696680 DOI: 10.1021/acs.langmuir.2c01154] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
As the human excreta, urine is often used as one of the test materials in medical research due to its composition and content directly reflecting the health status of the body. Considering that the substances in urine may show different effects on its freezing process, solidification characteristics of sessile urine droplets on a horizontal cold plate surface under natural convection were experimentally investigated by comparing with those of water droplets under same conditions. To make the conclusion analysis more reasonable, the urine of a human without any diseases, especially metabolic diseases, was treated and used. The characteristics include nucleation location, dynamic variation of droplet color, and temperatures at different heights inside the droplet, and so forth. It was found that, similar to that of a water droplet, the solidification process of a urine droplet also experiences the following four stages: supercooling, recalescence, freezing, and cooling, in chronological order. Differently, the urine droplet changes from transparent to blur white at the supercooling stage due to the precipitation of inorganic salts. For nucleation locations, 46.67% cases are at the bottom, while others are at the top and middle of urine droplets. For a 10 μL droplet on a surface of -30 °C, urine has a 0.95 s freezing duration shorter than water, and a 5.31 °C lower phase-transition temperature. Results of this study are expected to reflect the content of substances in urine and thus provide references for urinalysis of patients with metabolic diseases.
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Affiliation(s)
- Qun Dang
- Department of Energy and Power Engineering, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Mengjie Song
- Department of Energy and Power Engineering, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Chaobin Dang
- Graduate School of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui-shi, Fukui 910-8507, Japan
| | - Tianzhuo Zhan
- Graduate School of Interdisciplinary New Science, Toyo University, 2100 Kujirai, Kawagoe, Saitama 350-8585, Japan
| | - Long Zhang
- Department of Energy and Power Engineering, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
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Maity P, Koltai P, Schumacher J. Large-scale flow in a cubic Rayleigh-Bénard cell: long-term turbulence statistics and Markovianity of macrostate transitions. Philos Trans A Math Phys Eng Sci 2022; 380:20210042. [PMID: 35465712 DOI: 10.1098/rsta.2021.0042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Accepted: 12/23/2021] [Indexed: 06/14/2023]
Abstract
We investigate the large-scale circulation (LSC) in a turbulent Rayleigh-Bénard convection flow in a cubic closed convection cell by means of direct numerical simulations at a Rayleigh number Ra = 106. The numerical studies are conducted for single flow trajectories up to 105 convective free-fall times to obtain a sufficient sampling of the four discrete LSC states, which can be summarized to one macrostate, and the two crossover configurations which are taken by the flow in between for short periods. We find that large-scale dynamics depends strongly on the Prandtl number Pr of the fluid which has values of 0.1, 0.7, and 10. Alternatively, we run an ensemble of 3600 short-term direct numerical simulations to study the transition probabilities between the discrete LSC states. This second approach is also used to probe the Markov property of the dynamics. Our ensemble analysis gave strong indication of Markovianity of the transition process from one LSC state to another, even though the data are still accompanied by considerable noise. It is based on the eigenvalue spectrum of the transition probability matrix, further on the distribution of persistence times and the joint distribution of two successive microstate persistence times. This article is part of the theme issue 'Mathematical problems in physical fluid dynamics (part 1)'.
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Affiliation(s)
- Priyanka Maity
- Institute of Thermodynamics and Fluid Mechanics, Technische Universität Ilmenau, Postfach 100565, Ilmenau 98684, Germany
| | - Péter Koltai
- Department of Mathematics, Freie Universität Berlin, Arnimallee 6, Berlin 14195, Germany
| | - Jörg Schumacher
- Institute of Thermodynamics and Fluid Mechanics, Technische Universität Ilmenau, Postfach 100565, Ilmenau 98684, Germany
- Tandon School of Engineering, New York University, New York, NY 11201, USA
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García-Fernández L, Bataller H, Fruton P, Giraudet C, Vailati A, Croccolo F. Stabilized convection in a ternary mixture with two Soret coefficients of opposite sign. Eur Phys J E Soft Matter 2022; 45:52. [PMID: 35633426 PMCID: PMC9148296 DOI: 10.1140/epje/s10189-022-00202-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Accepted: 04/27/2022] [Indexed: 06/15/2023]
Abstract
We performed ground-based experiments on the sample polystyrene-toluene-cyclohexane in order to complement the experimental activities in microgravity conditions related to the ESA projects DCMIX4 and Giant Fluctuations. After applying a stabilizing thermal gradient by heating from above a layer of the fluid mixture, we studied over many hours the density variations in the bidimensional horizontal field by means of a Shadowgraph optical setup. The resulting images evidence the appearance of convective instability after a diffusive time associated with the binary molecular solvent consisting of toluene and cyclohexane, confirming the negative sign of the Soret coefficient of this mixture. After a larger diffusive time related to mass diffusion of the polystyrene in the binary solvent, convection was suppressed by the increasing stabilizing density gradient originated by the Soret-induced concentration gradient of the polymer. This is compatible with a positive sign of the Soret coefficient of the polymer in the binary solvent.
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Affiliation(s)
- Loreto García-Fernández
- E2S UPPA, CNRS, TotalEnergies, LFCR UMR5150, Universite de Pau et des Pays de l’Adour, Anglet, France
- Centre National d’Études Spatiales (CNES), 2, Place Maurice Quentin, Paris, France
- Department of Structure of Matter, Thermal Physics and Electronics, Faculty of Physics, University Complutense of Madrid, Madrid, Spain
| | - Henri Bataller
- E2S UPPA, CNRS, TotalEnergies, LFCR UMR5150, Universite de Pau et des Pays de l’Adour, Anglet, France
| | - Paul Fruton
- E2S UPPA, CNRS, TotalEnergies, LFCR UMR5150, Universite de Pau et des Pays de l’Adour, Anglet, France
| | - Cédric Giraudet
- E2S UPPA, CNRS, TotalEnergies, LFCR UMR5150, Universite de Pau et des Pays de l’Adour, Anglet, France
| | - Alberto Vailati
- Dipartimento di Fisica “A. Pontremoli”, Università degli Studi di Milano, Milan, Italy
| | - Fabrizio Croccolo
- E2S UPPA, CNRS, TotalEnergies, LFCR UMR5150, Universite de Pau et des Pays de l’Adour, Anglet, France
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Alqarni MS, Yasmin S, Waqas H, Khan SA. Recent progress in melting heat phenomenon for bio convection transport of nanofluid through a lubricated surface with swimming microorganisms. Sci Rep 2022; 12:8447. [PMID: 35589791 PMCID: PMC9120440 DOI: 10.1038/s41598-022-12230-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 04/18/2022] [Indexed: 11/24/2022] Open
Abstract
The cooling of numerous microelectronic devices has become a need in today's world. Nanofluids, a novel type of heat transport fluid containing nano-sized particles embedded in a host liquid, were developed a few years ago. Impact of ultra-fine nanoparticles with oil, water, or ethylene glycol produces these fluids. Nano-liquids have a variety of applications, including engine cooling, electronic devices, biomedicine, and the manufacture of thermal exchangers. The main objective of current research article is to scrutinizes theoretically, the effects of axisymmetric magnetohydrodynamic flow of bio-convective nanoliquid through a moving surface in the occurrence of swimming microorganisms. The idea of the envisaged model is improved by considering the consequence of thermal radiation, activation energy with generalized slip effects under convective boundaries. The present analysis is developed in the form of mathematical formulation and then solved numerically. The governing flow equations are transmuted into dimensionless nonlinear ODEs system by compatible similarity transformations and then integrated this so-formulated highly nonlinear problem numerically via bvp4c built-in scheme in MATLAB. The significance of influential parameters versus velocity field, temperature profile, concentration field and motile density of microorganism's profile are examined with the aid of graphs and tabular data. The physical interpretation of outcomes highlight that the velocity receives increment for amplified mixed convection parameter. The thermal profile is found to be reducing with a greater Prandtl number. The concentration profile of nanoparticle boosts up for greater activation energy parameter. The microorganism's profile is reduced via bioconvection Lewis number. This investigation contains the significance of bioconvection phenomenon, thermal radiation, slip effects and activation energy under convective boundary conditions. These impacts are used in axisymmetric, stagnation point flow of bioconvective magnetized nanofluid containing swimming gyrotactic motile microorganisms over a lubricated surface. The present analysis is not yet published.
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Affiliation(s)
- Marei Saeed Alqarni
- Department of Mathematics, College of Sciences, King Khalid University, Abha, 61413, Saudi Arabia
| | - Sumeira Yasmin
- Department of Mathematics, Government College University Faisalabad, Faisalabad, 38000, Pakistan
| | - Hassan Waqas
- Department of Mathematics, Government College University Faisalabad, Faisalabad, 38000, Pakistan.
| | - Shan Ali Khan
- Department of Mathematics, Government College University Faisalabad, Faisalabad, 38000, Pakistan
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Zhang L, Puneeth V, Ijaz Khan M, El-Zahar ER, Manjunath N, Shah NA, Chung JD, Khan SU, Khan MI. Applications of bio convection for tiny particles due to two concentric cylinders when role of Lorentz force is significant. PLoS One 2022; 17:e0265026. [PMID: 35503769 PMCID: PMC9064088 DOI: 10.1371/journal.pone.0265026] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Accepted: 02/20/2022] [Indexed: 11/25/2022] Open
Abstract
The bioconvection flow of tiny fluid conveying the nanoparticles has been investigated between two concentric cylinders. The contribution of Lorenz force is also focused to inspect the bioconvection thermal transport of tiny particles. The tiny particles are assumed to flow between two concentric cylinders of different radii. The first cylinder remains at rest while flow is induced due to second cylinder which rotates with uniform velocity. Furthermore, the movement of tiny particles follows the principle of thermophoresis and Brownian motion as a part of thermal and mass gradient. Similarly, the gyro-tactic microorganisms swim in the nanofluid as a response to the density gradient and constitute bio-convection. The problem is modeled by using the certain laws. The numerical outcomes are computed by using RKF -45 method. The graphical simulations are performed for flow parameters with specific range like 1≤Re≤5, 1≤Ha≤5, 0.5≤Nt≤2.5, 1≤Nb≤3, 0.2≤Sc≤1.8, 0.2≤Pe≤1.0 and 0.2≤Ω≤1.0. It is observed that the flow velocity decreases with the increase in the Hartmann number that signifies the magnetic field. This outcome indicates that the flow velocity can be controlled externally through the magnetic field. Also, the increase in the Schmidt numbers increases the nanoparticle concentration and the motile density.
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Affiliation(s)
- Lei Zhang
- Yellow River Institute of Hydraulic Research, YRCC, Zhengzhou, China
- Henan Engineering Research Center of Hydropower Engineering Abrasion Test and Protection, Zhengzhou, China
| | - V. Puneeth
- Department of Mathematics, CHRIST (Deemed to be University), Bengaluru, India
| | - Muhammad Ijaz Khan
- Department of Mathematics and Statistics, Riphah International University, Islamabad, Pakistan
| | - Essam Roshdy El-Zahar
- Department of Mathematics, College of Science and Humanities in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia
- Department of Basic Engineering Science, Faculty of Engineering, Menoufia University, Shebin El-Kom, Egypt
| | - N. Manjunath
- Department of Sciences and Humanities, CHRIST (Deemed to be University), Bengaluru, India
| | - Nehad Ali Shah
- Department of Mechanical Engineering, Sejong University, Seoul, Korea
| | - Jae Dong Chung
- Department of Mechanical Engineering, Sejong University, Seoul, Korea
- * E-mail:
| | - Sami Ullah Khan
- Department of Mathematics, COMSATS University Islamabad, Sahiwal, Pakistan
| | - M. Imran Khan
- Division of Sustainable Development, College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, Doha, Qatar
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Parvin S, Isa SSPM, Al- Duais FS, Hussain SM, Jamshed W, Safdar R, Eid MR. The flow, thermal and mass properties of Soret-Dufour model of magnetized Maxwell nanofluid flow over a shrinkage inclined surface. PLoS One 2022; 17:e0267148. [PMID: 35486644 PMCID: PMC9053785 DOI: 10.1371/journal.pone.0267148] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Accepted: 04/03/2022] [Indexed: 01/09/2023] Open
Abstract
A mathematical model of 2D-double diffusive layer flow model of boundary in MHD Maxwell fluid created by a sloping slope surface is constructed in this paper. The numerical findings of non-Newtonian fluid are important to the chemical processing industry, mining industry, plastics processing industry, as well as lubrication and biomedical flows. The diversity of regulatory parameters like buoyancy rate, magnetic field, mixed convection, absorption, Brownian motion, thermophoretic diffusion, Deborah number, Lewis number, Prandtl number, Soret number, as well as Dufour number contributes significant impact on the current model. The steps of research methodology are as followed: a) conversion from a separate matrix (PDE) to standard divisive calculations (ODEs), b) Final ODEs are solved in bvp4c program, which developed in MATLAB software, c) The stability analysis part also being developed in bvp4c program, to select the most effective solution in the real liquid state. Lastly, the numerical findings are built on a system of tables and diagrams. As a result, the profiles of velocity, temperature, and concentration are depicted due to the regulatory parameters, as mentioned above. In addition, the characteristics of the local Nusselt, coefficient of skin-friction as well as Sherwood numbers on the Maxwell fluid are described in detail.
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Affiliation(s)
- Shahanaz Parvin
- Institute for Mathematical Research, Universiti Putra Malaysia, Selangor, Malaysia
| | - Siti Suzilliana Putri Mohamed Isa
- Institute for Mathematical Research, Universiti Putra Malaysia, Selangor, Malaysia
- Centre of Foundation Studies for Agricultural Science, Universiti Putra Malaysia, Selangor, Malaysia
- * E-mail:
| | - Fuad S. Al- Duais
- Mathematics Department, College of Humanities and Science in Aflaj, Prince Sattam Bin Abdulaziz University, AL Aflaj, Saudia Arabia
- Administration Department, Administrative Science College Thamar University, Thamar, Yemen
| | - Syed M. Hussain
- Department of Mathematics, Faculty of Science, Islamic University of Madinah, Madinah, Saudi Arabia
| | - Wasim Jamshed
- Department of Mathematics, Capital University of Science and Technology, Islamabad, Pakistan
| | - Rabia Safdar
- Department of Mathematics, Lahore College for Women University, Lahore, Pakistan
| | - Mohamed R. Eid
- Department of Mathematics, Faculty of Science, New Valley University, Al-Kharga, Al-Wadi Al-Gadid, Egypt
- Department of Mathematics, Faculty of Science, Northern Border University, Arar, Saudi Arabia
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Mugova E, Wolkersdorfer C. Density stratification and double-diffusive convection in mine pools of flooded underground mines - A review. Water Res 2022; 214:118033. [PMID: 35303609 DOI: 10.1016/j.watres.2021.118033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 11/25/2021] [Accepted: 12/30/2021] [Indexed: 06/14/2023]
Abstract
Layering of water bodies with different physico-chemical properties is called stratification. This physical effect is known from lakes or oceans but also occurs in flooded underground mines and has been studied in the past. This review gives a summary of their investigation methods, flow dynamics, stratification development and breakdown. Furthermore, the barrier effect of stratification is discussed, meaning that less mineralized water bodies (CF water bodies) on the top are separated from higher mineralized water bodies (WM water bodies) in the lower parts of the mine. This separation causes less mineralized water to discharge from the flooded mine and mine water treatment can be reduced or omitted. Various options to study mine water stratification will be discussed, thereunder tracer tests, camera-aided depth profile measurements and depth dependant mine water sampling. Studies about free convection and natural stratification as well as those about using artificial stratification to encapsulate the lower quality water in the deeper mine parts will be presented. No forecasting tool for the existence or development of stratification in flooded mines was found in the literature. References and a discussion about the long-term stability of the stratification and its potential implementation will be given. The conclusions show that precise predictions of mine water stratification are currently not possible in all detail, but wherever stratification occurs, it is mostly stable over a longer period of time as the density difference between the CF and WM layers prevents their mixing.
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Affiliation(s)
- Elke Mugova
- Technische Hochschule Georg Agricola (THGA), Forschungszentrum Nachbergbau, Herner Straße 45, 44787 Bochum, Germany, ORCID: 0000-0001-6019-9945.
| | - Christian Wolkersdorfer
- South African Research Chair for Acid Mine Drainage Treatment, Tshwane University of Technology (TUT), Private Bag X680, Pretoria 0001, South Africa, ORCID: 0000-0003-2035-1863.
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Sasidharan UK, Bandaru R. Thermal management of photovoltaic panel with nano-enhanced phase change material at different inclinations. Environ Sci Pollut Res Int 2022; 29:34759-34775. [PMID: 35040060 DOI: 10.1007/s11356-021-18075-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Accepted: 12/08/2021] [Indexed: 06/14/2023]
Abstract
Photovoltaic (PV) panel, coupled with phase change material (PCM), has attracted broad attention for the panel's thermal management. Despite the higher energy storage capability of PCMs, the main disadvantage is their low thermal conductivity which is compensated to an extent with the nano-enhanced PCMs (NEPCMs). In this study, numerical simulations are carried out to compare the heat transfer phenomena and thermal response of PV-NEPCM with simple PV-PCM for various tilt angles. CuO nanoparticles with mass concentrations of 1%, 3% and 5% are selected for NEPCM. The thermal performance of PV-NEPCM at inclinations of 0°, 15°, 30° and 45 [Formula: see text] is compared with a simple PV-PCM system to know the effect of mass concentration of nanoparticles and inclination. The average temperature of PV, liquid fraction and thermal energy stored in PCM, the pattern of isotherms and streamlines and performance of PV are compared for PV-PCM and PV-NEPCM systems. Results show that the loading of nanoparticles increases the heat transfer rate to PCM in all the configurations. It has also been shown that at lower inclinations, the use of NEPCM is more effective due to the presence of conduction heat transfer. At higher tilt angles, heat transfer from the PV module takes place by natural convection. By using NEPCM, the maximum decrease in PV temperature of 1.26 [Formula: see text] and maximum improvement in the liquid fraction of 8.25% are achieved when [Formula: see text] with 5% mass concentration of nanoparticles compared to simple PCM. Enhancement of thermal energy stored in PCM increases upon adding nanoparticles, and the highest improvement is obtained for [Formula: see text] Maximum enhancement of efficiency of PV module is found to be 1.75% for [Formula: see text] inclination on adding nanoparticles of 5% mass concentration.
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Affiliation(s)
| | - Rohinikumar Bandaru
- CFD Laboratory, Mechanical Engineering Department, National Institute of Technology Calicut, Kozhikode, 673601, Kerala, India.
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Wu D, Shi T, Niu X, Chen Z, Cui J, Chen Y, Zhang X, Liu J, Ji M, Wang X, Pu W. Seasonal to sub-seasonal variations of the Asian Tropopause Aerosols Layer affected by the deep convection, surface pollutants and precipitation. J Environ Sci (China) 2022; 114:53-65. [PMID: 35459514 DOI: 10.1016/j.jes.2021.07.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 07/09/2021] [Indexed: 06/14/2023]
Abstract
The Asian Tropopause Aerosols Layer (ATAL) refers to an accumulation of aerosols in the upper troposphere and lower stratosphere during boreal summer over Asia, which has a fundamental impact on the monsoon system and climate change. In this study, we primarily analyze the seasonal to sub-seasonal variations of the ATAL and the factors potentially influencing those variations based on MERRA2 reanalysis. The ability of the reanalysis to reproduce the ATAL is well validated by CALIPSO observations from May to October 2016. The results reveal that the ATAL has a synchronous spatiotemporal pattern with the development and movement of the Asian Summer Monsoon. Significant enhancement of ATAL intensity is found during the prevailing monsoon period of July-August, with two maxima centered over South Asia and the Arabian Peninsula. Owing to the fluctuations of deep convection, the ATAL shows an episodic variation on a timescale of 7-12 days. Attribution analysis indicates that deep convection dominates the variability of the ATAL with a contribution of 62.7%, followed by a contribution of 36.6% from surface pollutants. The impact of precipitation is limited. The ATAL further shows a clear diurnal variation: the peak of ATAL intensity occurs from 17:30 to 23:30 local time (LT), when the deep convection becomes strongest; the minimum ATAL intensity occurs around 8:30 LT owing to the weakened deep convection and photochemical reactions in clouds. The aerosol components of the ATAL show different spatiotemporal patterns and imply that black carbon and organic carbon come mainly from India, whereas sulfate comes mainly from China during the prevailing monsoon period.
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Affiliation(s)
- Dongyou Wu
- College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
| | - Tenglong Shi
- College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
| | - Xiaoying Niu
- College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
| | - Ziqi Chen
- College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
| | - Jiecan Cui
- College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
| | - Yang Chen
- College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
| | - Xueying Zhang
- Jilin Weather Modification Office, Changchun 130000, China
| | - Jun Liu
- College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
| | - Mingxia Ji
- College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
| | - Xin Wang
- College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China; School of Earth System Science, Tianjin University, Tianjin 300072, China
| | - Wei Pu
- College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China.
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Zhou R, Zhan H, Wang Y. On the role of rock matrix to heat transfer in a fracture-rock matrix system. J Contam Hydrol 2022; 245:103950. [PMID: 34979415 DOI: 10.1016/j.jconhyd.2021.103950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 12/24/2021] [Accepted: 12/27/2021] [Indexed: 06/14/2023]
Abstract
In this study, a fully coupled analytical model is developed for thermal energy transfer in a single fracture-rock matrix system where the coupling implies that the governing equations of thermal transfer in the fracture and rock matrix are supplemented with the continuity conditions of temperature and thermal flux at the interfaces of the fracture-rock matrix. The proposed model accounts for thermal convection, longitudinal thermal conduction and thermal dispersion in the fracture, and transverse thermal conduction in the rock matrix. The fully coupled two-dimensional model is established to investigate the thermal energy transfer processes, assess the spatiotemporal temperature distribution in the fracture and rock matrix system and investigate the role of the rock matrix. The solutions are verified with the existing studies and proven to be accurate and robust. The present study demonstrates that: 1) thermal dispersion in the fracture plays an important role in the temperature distribution in the fracture and rock matrix domains, and longitudinal thermal conduction in the fracture has minor effects on the temperature distribution in the system; 2) transverse thermal conduction in the rock matrix is a critical parameter that determines the spatiotemporal temperature distribution in both the fracture and the rock matrix domains. Ignoring thermal conduction in the rock matrix will lead to a significant overestimation of temperature in the short and long terms; 3) the sensitivity analysis implies that thermal energy transfer in the system is sensitive to the fluid velocity in the fracture, thermal dispersivity in the fracture and thermal conductivity in the rock matrix, and less sensitive to thermal conductivity in the fracture.
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Affiliation(s)
- Renjie Zhou
- Department of Environmental and Geosciences, Sam Houston State University, Huntsville, TX 77340, USA.
| | - Hongbin Zhan
- Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, USA
| | - Yinuo Wang
- Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, USA
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Kumar PG, Vigneswaran S, Meikandan M, Sakthivadivel D, Salman M, Thakur AK, Sathyamurthy R, Kim SC. Exploring the photo-thermal conversion behavior and extinction coefficient of activated carbon nanofluids for direct absorption solar collector applications. Environ Sci Pollut Res Int 2022; 29:13188-13200. [PMID: 34585351 DOI: 10.1007/s11356-021-16637-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 09/16/2021] [Indexed: 06/13/2023]
Abstract
This work aims to explore the optical and thermal conversion characteristics of activated carbon-solar glycol nanofluids with various volume fractions namely 0.2, 0.4, and 0.6%, respectively. Kigelia africana leaves were synthesized into porous activated carbon nanomaterials by using the high-temperature sintering process and the pyrolysis process in a muffle furnace. The experimental investigation was carried out with different nanofluid concentrations by using the solar simulator. Nanofluids were heated with the assistance of a solar simulator test system and the convection/conduction heat loss was decreased by using the glass as an insulating material around the test section. Prepared nanofluid with 0.6 vol% activated carbon augmented the thermal conductivity by 14.36% at 60°C. The maximum temperature difference of 10°C was attained at 0.6% volume concentrations of nanofluid as compared with base fluid (solar glycol). In addition, maximum receiver efficiency of 94.51% was attained at 0.6% volume fractions of activated carbon-based nanofluid compared with solar glycol thru a light radiation time of 600 s. Moreover, activated carbon-based nanofluid exhibited significantly higher absorption efficiency as the majority of the radiation was absorbed by the nanofluid. It is concluded that activated carbon-based nanofluids could be a suitable low-cost highly stable material for developing working fluid for direct absorbance solar collector-based applications.
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Affiliation(s)
- Poongavanam Ganesh Kumar
- School of Mechanical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongbuk, 712-749, Republic of Korea
| | - Shunmugharajan Vigneswaran
- Department of Energy and Environmental Engineering, Saveetha School of Engineering, Chennai, 602105, India
| | - Megaraj Meikandan
- Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Avadi, India
| | - Duraisamy Sakthivadivel
- School of Mechanical Engineering, Vellore Institute of Technology, Vellore, Tamil Nadu, 632014, India
| | - Mohammad Salman
- School of Mechanical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongbuk, 712-749, Republic of Korea
| | - Amrit Kumar Thakur
- Department of Mechanical Engineering, KPR Institute of Engineering and Technology, Arasur, Coimbatore, Tamil Nadu, 641407, India
| | - Ravishankar Sathyamurthy
- Department of Mechanical Engineering, KPR Institute of Engineering and Technology, Arasur, Coimbatore, Tamil Nadu, 641407, India.
| | - Sung Chul Kim
- School of Mechanical Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongbuk, 712-749, Republic of Korea
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44
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Tanaka H, Komoda Y, Horie T, Imakoma H, Ohmura N. Drying rate of latex coating affected by the deformability of resin particles in convection drying. Eur Phys J E Soft Matter 2022; 45:2. [PMID: 35006390 DOI: 10.1140/epje/s10189-021-00155-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 12/14/2021] [Indexed: 06/14/2023]
Abstract
Latex paints are widely used, and many researchers pointed out that the film formation process depends on the deformability of dispersed polymer particles. However, the relationship between the film formation process and drying rate has not been totally understood due to the lack of accurate data on drying rate throughout the drying process. In the present study, we measured the drying rate of latex coating by the temperature change method proposed by Imakoma in convective drying. We revealed that the drying process significantly depends on particle deformability, especially in the former stage of the falling drying rate period. At a low drying temperature, the close-packed structure of polymer particles is formed throughout the film at the end of the constant drying rate period. On the other hand, partially deformed soft particles due to wet sintering inhibit the drying rate even under high moisture content at high drying temperatures. In either case, after forming the closest-packed structure, the shrinkage of the gap space between particles due to capillary deformation decreases the drying rate, proportional to the moisture content.
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Affiliation(s)
- Hiroaki Tanaka
- Department of Chemical Science and Engineering, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe, Hyogo, 657-8501, Japan
| | - Yoshiyuki Komoda
- Department of Chemical Science and Engineering, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe, Hyogo, 657-8501, Japan.
| | - Takafumi Horie
- Department of Chemical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan
| | - Hironobu Imakoma
- Graduate School of Engineering, Osaka City University, 3 Sugimoto Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Naoto Ohmura
- Department of Chemical Science and Engineering, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe, Hyogo, 657-8501, Japan
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Kabeel AE, Dharmadurai PDL, Vasanthaseelan S, Sathyamurthy R, Ramani B, Manokar AM, Chamkha A. Experimental studies on natural convection open and closed solar drying using external reflector. Environ Sci Pollut Res Int 2022; 29:1391-1400. [PMID: 34355324 DOI: 10.1007/s11356-021-15768-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 07/28/2021] [Indexed: 06/13/2023]
Abstract
For low temperature agricultural crop and meat drying, dryers utilizing the renewable energy source (solar energy) appear to be an efficient technique as it is ecofriendly, energy efficient, and available in free of cost. This work presents the experimental investigation on a solar food dryer equipped with external reflectors to enhance the rate of drying efficiency by removing the moisture content available in the anchovy fish. A comparison of conventional open solar drying is carried out to assess the parameters such as drying efficiency, moisture removal rate, and heat energy required for drying the anchovy fish using the modified solar dryer using the natural convection technique. From the experimental results it is observed that the relative humidity greatly influence the rate of drying. The average relative humidity during the experiments using open solar drying is found as 50-65% whereas, the using solar dryer the average relative humidity inside the chamber is found as 20-35%. The relative humidity of the fish using open solar drying is higher as compared to solar dryer drying as the drying products are kept in open atmosphere. The physical examination results on the dried products proved that using a modified solar dryers, the dried product is free from insects, and dust. Also, it is found that the loss of color from the product is a minimum while compared to conventional open solar drying. The results showed that the thermal efficiency of top tray (dryer 1) and bottom tray (dryer 2) is comparatively higher as compared to that of conventional open solar drying and found as 16.73 and 19.34 %, respectively. Results also showed that nearly 20.05% of the energy could be saved using the modified solar dryer as compared to the open solar drying technique.
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Affiliation(s)
- Abd Elnaby Kabeel
- Mechanical Power Engineering Department, Faculty of Engineering, Tanta University, Tanta, Egypt
- Faculty of Engineering, Delta University for Science and Technology, Gamasa, Egypt
| | | | - Sathiyaseelan Vasanthaseelan
- Department of Mechanical Engineering, KPR Institute of Engineering and Technology, Arasur, Tamil Nadu, 641407, Coimbatore, India
| | - Ravishankar Sathyamurthy
- Mechanical Power Engineering Department, Faculty of Engineering, Tanta University, Tanta, Egypt.
- Department of Mechanical Engineering, KPR Institute of Engineering and Technology, Arasur, Tamil Nadu, 641407, Coimbatore, India.
| | - Bharathwaaj Ramani
- Department of Mechanical Engineering, KPR Institute of Engineering and Technology, Arasur, Tamil Nadu, 641407, Coimbatore, India
| | - Athikesavan Muthu Manokar
- Department of Mechanical Engineering, B.S Abdur Rahman Crescent Institute of Science and Technology, Vandalur, Chennai, Tamil Nadu, 600048, India
| | - Ali Chamkha
- Faculty of Engineering, Kuwait College of Science and Technology, Doha District, Kuwait
- Center of Excellence in Desalination Technology, King Abdulaziz University, P.O. Box 80200, Jeddah, 21589, Saudi Arabia
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Abstract
Since its first description in 1994, convection-enhanced delivery (CED) has become a reliable method of administering drugs directly into the brain parenchyma. More predictable and effective than simple diffusion, CED bypasses the challenging boundary of the blood brain barrier, which has frustrated many attempts at delivering large molecules or polymers into the brain parenchyma. Although most of the clinical work with CED has been carried out on adults with incurable neoplasms, principally glioblastoma multiforme, an increasing number of studies have recognized its potential for paediatric applications, which now include treatment of currently incurable brain tumours such as diffuse intrinsic pontine glioma (DIPG), as well as metabolic and neurotransmitter diseases. The roadmap for the development of hardware and use of pharmacological agents in CED has been well-established, and some neurosurgical centres throughout the world have successfully undertaken clinical trials, admittedly mostly early phase, on the basis of in vitro, small animal and large animal pre-clinical foundations. However, the clinical efficacy of CED, although theoretically logical, has yet to be unequivocally demonstrated in a clinical trial; this applies particularly to neuro-oncology.This review aims to provide a broad description of the current knowledge of CED as applied to children. It reviews published studies of paediatric CED in the context of its wider history and developments and underlines the challenges related to the development of hardware, the selection of pharmacological agents, and gene therapy. It also reviews the difficulties related to the development of clinical trials involving CED and looks towards its potential disease-modifying opportunities in the future.
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Affiliation(s)
- K Aquilina
- Department of Neurosurgery, Great Ormond Street Hospital, London, UK.
| | - A Chakrapani
- Department of Metabolic Medicine, Great Ormond Street Hospital, London, UK
| | - L Carr
- Department of Neurology and Neurodisability, Great Ormond Street Hospital, London, UK
| | - M A Kurian
- Department of Neurology and Neurodisability, Great Ormond Street Hospital, London, UK
- Neurogenetics Group, Developmental Neurosciences, Zayed Centre for Research into Rare Disease in Children, UCL-Great Ormond Street Institute of Child Health, London, UK
| | - D Hargrave
- Cancer Group, UCL-Great Ormond Street Institute of Child Health, London, UK
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Ilya A, Ashraf M, Ali A, Shah Z, Kumam P, Thounthong P. Heat source and sink effects on periodic mixed convection flow along the electrically conducting cone inserted in porous medium. PLoS One 2021; 16:e0260845. [PMID: 34941871 PMCID: PMC8699638 DOI: 10.1371/journal.pone.0260845] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Accepted: 11/18/2021] [Indexed: 12/04/2022] Open
Abstract
The system of partial differential equations governing the unsteady hydromagnetic boundary-layer flow along an electrically conducting cone embedded in porous medium in the presence of thermal buoyancy, magnetic field, heat source and sink effects are formulated. These equations are solved numerically by using an implicit Finite-Difference Method. The effects of the various parameters that are source/sink parameter, porous medium parameter, Prandtl number, mixed convection parameter and magnetic Prandtl number on the velocity, temperature profiles, transverse magnetic field are predicted. The effects of heat source and sink parameter on the time-mean value as well as on transient skin friction; heat transfer and current density rate are delineated especially in each plot. The extensive results reveal the existence of periodicity and show that periodicity becomes more distinctive for source and sink in the case of the electrically conducting cone. As the source and sink contrast increases, the periodic convective motion is invigorated to the amplitude and phase angle as reflect in the each plot. The dimensionless forms of the set of partial differential equations is transform into primitive form by using primitive variable formulation and then are solved numerically by using Finite Difference Scheme which has given in literature frequently. Physical interpretations of the overall flow and heat transfer along with current density are highlighted with detail in results and discussion section. The main novelty of the obtained numerical results is that first we retain numerical results for steady part and then used in unsteady part to obtain transient skin friction, rate of heat transfer and current density. The intensity of velocity profile is increased for increasing values of porosity parameter Ω, the temperature and mass concentration intensities are reduced due heat source effects.
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Affiliation(s)
- Asifa Ilya
- Department of Mathematics, Faculty of Science, University of Sargodha, Sargodha, Pakistan
| | - Muhammad Ashraf
- Department of Mathematics, Faculty of Science, University of Sargodha, Sargodha, Pakistan
| | - Aamir Ali
- Department of Mathematics, COMSATS University Islamabad, Attock, Pakistan
| | - Zahir Shah
- Department of Mathematical Sciences, University of Lakki Marwat, Lakki Marwat, Khyber Pakhtunkhwa, Pakistan
- * E-mail: (PK); (ZS)
| | - Poom Kumam
- Fixed Point Research Laboratory, Fixed Point Theory and Applications Research Group, Center of Excellence in Theoretical and Computational Science (TaCS-CoE), Faculty of Science, King Mongkut’s University of Technology Thonburi (KMUTT), Thung Khru, Bangkok, Thailand
- Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan
- * E-mail: (PK); (ZS)
| | - Phatiphat Thounthong
- Department of Teacher Training in Electrical Engineering, Renewable Energy Research Centre, Faculty of Technical Education, King Mongkut’s University of Technology North Bangkok, Bangsue, Bangkok, Thailand
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48
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Kumar S, Sahu AK, Kumar M. Heat and water flux modeling in an earth dam. Water Sci Technol 2021; 84:2760-2779. [PMID: 34850692 DOI: 10.2166/wst.2021.241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
This study aims to identify the water flux in an earth dam using heat flux due to convection. Sixteen earth dam models were constructed in a hydraulic flume by varying geometrical and flow input parameters to identify heat and water flux. Homogeneous as well as earth dams with clay cores were built in a hydraulic flume. Temperature measurements were done to calculate heat flux in the experimental model. A finite element model of the earth dam using Seep/w was developed to obtain water flux, while temp/w was used to obtain heat flux. These results were used as input in Temp/w and Seep/w in Geostudio 2020. Significant reduction of the heat and water flux was seen while comparing the homogeneous models with central impervious core models. An increase in the heat and water flux was observed on increasing the downstream filter's length, longitudinal slope, and vice versa with the upstream slope and the thickness of the clay core. Comparing fluxes in a homogeneous dam model (model 1) with the clay core model (model 9) with top width 2.4 m and bottom width 18 m in model 9, both water flux and heat flux were reduced by 78.46%. While comparing it with model 10, with bottom core width of 18 m and top core width of 1.9 m, both water flux and heat flux reduced by 77.72%. Heat flux measurements were found to be a valuable alternative to detecting water flux and seepage in an earth dam at a reduced cost.
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Affiliation(s)
- Sushant Kumar
- Department of Civil Engineering, Delhi Technological University, Delhi, India E-mail:
| | - A K Sahu
- Department of Civil Engineering, Delhi Technological University, Delhi, India E-mail:
| | - Munendra Kumar
- Department of Civil Engineering, Delhi Technological University, Delhi, India E-mail:
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49
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Czaplicka N, Grzegórska A, Wajs J, Sobczak J, Rogala A. Promising Nanoparticle-Based Heat Transfer Fluids-Environmental and Techno-Economic Analysis Compared to Conventional Fluids. Int J Mol Sci 2021; 22:9201. [PMID: 34502109 PMCID: PMC8431053 DOI: 10.3390/ijms22179201] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 08/20/2021] [Accepted: 08/24/2021] [Indexed: 11/28/2022] Open
Abstract
Providing optimal operating conditions is one of the major challenges for effective heating or cooling systems. Moreover, proper adjustment of the heat transfer fluid is also important from the viewpoint of the correct operation, maintenance, and cost efficiency of these systems. Therefore, in this paper, a detailed review of recent work on the subject of conventional and novel heat transfer fluid applications is presented. Particular attention is paid to the novel nanoparticle-based materials used as heat transfer fluids. In-depth comparison of environmental, technical, and economic characteristics is discussed. Thermophysical properties including thermal conductivity, specific heat, density, viscosity, and Prandtl number are compared. Furthermore, the possible benefits and limitations of various transfer fluids in the fields of application are taken into account.
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Affiliation(s)
- Natalia Czaplicka
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland; (A.G.); (A.R.)
| | - Anna Grzegórska
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland; (A.G.); (A.R.)
| | - Jan Wajs
- Institute of Energy, Faculty of Mechanical Engineering and Ship Technology, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland;
| | - Joanna Sobczak
- Research and Development Joanna Sobczak, Różnowo 8, 14-240 Susz, Poland;
| | - Andrzej Rogala
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland; (A.G.); (A.R.)
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50
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Chen D, Kim JT, Chamorro LP, Timperman AT. Exceeding ohmic scaling by more than one order of magnitude with a 3D ion concentration polarization system. Lab Chip 2021; 21:3094-3104. [PMID: 34259277 PMCID: PMC9680042 DOI: 10.1039/d1lc00470k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
We report an ion concentration polarization (CP) system that exceeds ohmic scaling, a barrier that has stood for more than four decades, by more than one order of magnitude. CP is used in many important applications, including the enrichment of trace analytes in microfluidic systems and water purification by electrodialysis. The mechanisms that control the current through these systems have been largely discovered, but the reduced currents and loss of efficiency imparted by the high resistance of the CP ion depleted zone have not been overcome. To obtain high currents, an ion permselective element with a microscale cross-section is interfaced with a macroscale reservoir. Confocal fluorescence microscopy and microparticle tracking velocimetry (μ-PTV) are used to characterize the depleted zone that emanates vertically from the CP inducing nanoporous gel into the macroscale reservoir. The shape and growth of the depleted zone and velocity in the surrounding bulk solution are consistent with natural convection being the driver of the depleted zone morphology and eliminating the high resistance created by the depleted zone in 1D and 2D systems. Once the resistance of the depleted zone is negated, the high currents are hypothesized to result from enhancement of counter-ion concentration in the nanoporous gel-filled microchannel. In contrast with conventional systems, the current increases monotonically and remains stable at a high quasi-steady level in the reported systems. These results may be used to increase the efficiency and performance of future devices that utilize CP, while the ability to collect purified water with this geometry is demonstrated.
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Affiliation(s)
- Dayi Chen
- Department of Bioengineering and Department of Chemistry, University of Illinois Urbana-Champaign, 1406 W Green St, Urbana, IL 61801, USA.
| | - Jin-Tae Kim
- Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, 1206 W. Green St., Urbana, IL 61801, USA
| | - Leonardo P Chamorro
- Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, 1206 W. Green St., Urbana, IL 61801, USA
| | - Aaron T Timperman
- Department of Bioengineering and Department of Chemistry, University of Illinois Urbana-Champaign, 1406 W Green St, Urbana, IL 61801, USA.
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