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Polat D, Yanmaz LE. Evaluating alternative temperature measurement sites in cats within a home environment: A comparison with rectal temperature. Vet Med Sci 2024; 10:e1423. [PMID: 38520702 PMCID: PMC10960608 DOI: 10.1002/vms3.1423] [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: 10/09/2023] [Revised: 02/19/2024] [Accepted: 03/01/2024] [Indexed: 03/25/2024] Open
Abstract
OBJECTIVE This study aimed to compare rectal temperature (RT) with temperatures measured in the pinna, cornea, medial canthus, gingiva, metacarpal pad and axillary region of cats in a home environment. ANIMALS STUDIED Five healthy mixed-breed cats (two females and three males) owned by a veterinarian were used. PROCEDURES All temperature measurements were conducted by the owner by using an infrared camera in the same room and initiated with the pinna, followed by the cornea, medial canthus, gingiva and metacarpal pad. Subsequently, axillary temperature (AT) and RT were recorded by a digital thermometer, respectively. The time taken for a single AT and RT measurements was recorded. RESULTS The average measurement time for RT was 17.34 ± 0.89 s, with a range of 8-32 s, whereas AT measurements took an average of 46.72 ± 1.16 s, with a range of 29-69 s. AT emerged as a superior alternative measurement site compared to others, exhibiting the lowest bias and the highest proportion of readings within the limits of clinical agreement. The mean difference between RT and AT, with 95% limits of agreement for the differences, was -0.26 (-1.13 to 0.61). CONCLUSIONS Anatomical regions were not all interchangeable with the rectum for assessing body temperature (BT), with AT recording the highest level of agreement with RT. When RT is not possible, AT could be considered as an alternative for monitoring BT in clinically healthy cats that live in a home environment.
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Affiliation(s)
- Dogukan Polat
- Department of SurgeryFaculty of Veterinary MedicineBurdur Mehmet Akif Ersoy UniversityBurdurTurkey
| | - Latif Emrah Yanmaz
- Department of SurgeryFaculty of Veterinary MedicineBurdur Mehmet Akif Ersoy UniversityBurdurTurkey
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van Heerwaarden B, Sgrò C, Kellermann VM. Threshold shifts and developmental temperature impact trade-offs between tolerance and plasticity. Proc Biol Sci 2024; 291:20232700. [PMID: 38320612 PMCID: PMC10846935 DOI: 10.1098/rspb.2023.2700] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Accepted: 01/08/2024] [Indexed: 02/08/2024] Open
Abstract
Mounting evidence suggests that ectotherms are already living close to their upper physiological thermal limits. Phenotypic plasticity has been proposed to reduce the impact of climate change in the short-term providing time for adaptation, but the tolerance-plasticity trade-off hypothesis predicts organisms with higher tolerance have lower plasticity. Empirical evidence is mixed, which may be driven by methodological issues such as statistical artefacts, nonlinear reaction norms, threshold shifts or selection. Here, we examine whether threshold shifts (organisms with higher tolerance require stronger treatments to induce maximum plastic responses) influence tolerance-plasticity trade-offs in hardening capacity for desiccation tolerance and critical thermal maximum (CTMAX) across Drosophila species with varying distributions/sensitivity to desiccation/heat stress. We found evidence for threshold shifts in both traits; species with higher heat/desiccation tolerance required longer hardening treatments to induce maximum hardening responses. Species with higher heat tolerance also showed reductions in hardening capacity at higher developmental acclimation temperatures. Trade-off patterns differed depending on the hardening treatment used and the developmental temperature flies were exposed to. Based on these findings, studies that do not consider threshold shifts, or that estimate plasticity under a narrow set of environments, will have a limited ability to assess trade-off patterns and differences in plasticity across species/populations more broadly.
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Affiliation(s)
| | - Carla Sgrò
- School of Biological Sciences, Monash University, Clayton 3800, Victoria, Australia
| | - Vanessa M. Kellermann
- School of Biological Sciences, Monash University, Clayton 3800, Victoria, Australia
- School of Agriculture Biomedicine and Environment, La Trobe University, Bundoora 3086, Victoria, Australia
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3
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Hassan SS, Aly SA, Al-Sulami AI, Albohy SAH, Salem MF, Nasr GM, Abdalla EM. Synthesis, characterization, PXRD studies, and theoretical calculation of the effect of gamma irradiation and antimicrobial studies on novel Pd(II), Cu(II), and Cu(I) complexes. Front Chem 2024; 12:1357330. [PMID: 38410818 PMCID: PMC10894937 DOI: 10.3389/fchem.2024.1357330] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Accepted: 01/22/2024] [Indexed: 02/28/2024] Open
Abstract
The main objective of this study is to synthesize and characterize of a new three complexes of Pd (II), Cu (II), and Cu (I) metal ions with novel ligand ((Z)-2-(phenylamino)-N'-(thiophen-2-ylmethylene)acetohydrazide) H2LB. The structural composition of new compounds was assessed using several analytical techniques including FT-IR, 1H-NMR, electronic spectra, powder X-ray diffraction, and thermal behavior analysis. The Gaussian09 program employed the Density Functional Theory (DFT) approach to optimize the geometry of all synthesized compounds, therefore obtaining the most favorable structures and crucial parameters. An investigation was conducted to examine the impact of γ-irradiation on ligands and complexes. Before and after γ-irradiation, the antimicrobial efficiency was investigated for the activity of ligands and their chelates. The Cu(I) complex demonstrated enhanced antibacterial activity after irradiation, as well as other standard medications such as ampicillin and gentamicin. Similarly, the Cu(I) complex exhibited superior activity against antifungal species relative to the standard drug Nystatin. The docking investigation utilized the target location of the topoisomerase enzyme (2xct) chain A.
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Affiliation(s)
- Safaa S. Hassan
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
| | - Samar A. Aly
- Department of Environmental Biotechnology, Genetic Engineering and Biotechnology Research Institute, University of Sadat City, Sadat, Egypt
| | - Ahlam I. Al-Sulami
- Department of Chemistry, College of Science, University of Jeddah, Jeddah, Saudi Arabia
| | - Salwa A. H. Albohy
- Chemistry Department, Faculty of Science (Girls), Al-Azhar University, Nasr, Cairo, Egypt
| | - Mohamed F. Salem
- Department of Environmental Biotechnology, Genetic Engineering and Biotechnology Research Institute, University of Sadat City, Sadat, Egypt
| | - Ghada M. Nasr
- Department of Molecular Diagnostics and Therapeutics, Genetic Engineering and Biotechnology Research Institute, University of Sadat City, Sadat, Egypt
| | - Ehab M. Abdalla
- Chemistry Department, Faculty of Science, New Valley University, El-Kharga, Egypt
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Kravets M, García-Alonso FJ, Abea A, Guàrdia MD, Muñoz I, Bañón S. Influence of Pasteurisation (Conventional vs. Radiofrequency) and Chill Storage on Retention of Ascorbic Acid, Tocopherol and Carotenoids in Salmorejo. Foods 2024; 13:349. [PMID: 38275716 PMCID: PMC10815261 DOI: 10.3390/foods13020349] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 01/19/2024] [Accepted: 01/21/2024] [Indexed: 01/27/2024] Open
Abstract
Salmorejo, a Mediterranean tomato-oil puree, is considered a dietary source of antioxidant vitamins C and E and carotenoids lycopene and β-carotene, the latter endowed with provitamin A activity. However, these antioxidants can be degraded in oxidation reactions catalysed or not by enzymes during pasteurisation and storage treatments used to stabilise the salmorejo before consumption. Due to its better penetration, the use of dielectric heating by radiofrequency (RF) may improve results of pasteurisation in this product. The objective was to assess the effects of pasteurisation temperature (70-100 °C, at 5 °C intervals) and storage time (0-5 months, at one-month intervals) on levels of ascorbic acid, α-tocopherol and carotenoids and antioxidant capacity (AC) in salmorejo pasteurised (over 10 s) by conventional (CH) or RF continuous heating. Two successive experiments were conducted to select an adequate pasteurisation temperature for use in the shelf-life study. Pasteurisation upon tested conditions allows a good retention of salmorejo antioxidants. Either CH or RF pasteurisers can be used with similar results. Vitamin C (L-ascorbic + dehydroascorbic acids) was more abundant (15-19 mg 100 g-1) than carotenoids (0.9-2.6 mg 100 g-1) (all-trans + cis lycopene and β-carotene) and α-tocopherol (0.8-1.2 mg 100 g-1) in the pasteurised product. Using excessively low temperatures (70 °C) resulted in partial losses of the three antioxidants, possibly due to oxidase residual activities. Intensifying thermal treatment improved this issue with minor losses of the thermolabile vitamin C and increased carotenoid content. Using a suitable temperature (80 °C) did not prevent most vitamin C from being degraded by the first month, while α-tocopherol, and, to a lesser extent, carotenoids, showed good retention levels during shelf life under refrigeration. Vitamins C and E and carotenoids, either by degradation, regeneration or releasing, likely contribute to the AC in salmorejo. Phenolic antioxidant response, radical-scavenging activities and redox potential values confirmed this finding. The pasteurised-chilled salmorejo shows good antioxidant properties with potential health implications, a positive nutritional aspect for consumers of this tomato-oil homogenate. The losses of antioxidants and AC due to pasteurization would be of little relevance compared to the losses accumulated during shelf life.
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Affiliation(s)
- Marina Kravets
- Department of Food Technology and Science and Nutrition, Veterinary Faculty, Regional Campus of International Excellence “Campus Mare Nostrum”, University of Murcia, 30100 Murcia, Spain; (M.K.); (F.J.G.-A.)
| | - Francisco Javier García-Alonso
- Department of Food Technology and Science and Nutrition, Veterinary Faculty, Regional Campus of International Excellence “Campus Mare Nostrum”, University of Murcia, 30100 Murcia, Spain; (M.K.); (F.J.G.-A.)
| | - Andrés Abea
- Institut de Recerca i Tecnologia Agroalimentàries IRTA—Food Technology Program, Finca Camps i Armet, Monells, 17121 Girona, Spain; (A.A.); (M.D.G.); (I.M.)
| | - Maria Dolors Guàrdia
- Institut de Recerca i Tecnologia Agroalimentàries IRTA—Food Technology Program, Finca Camps i Armet, Monells, 17121 Girona, Spain; (A.A.); (M.D.G.); (I.M.)
| | - Israel Muñoz
- Institut de Recerca i Tecnologia Agroalimentàries IRTA—Food Technology Program, Finca Camps i Armet, Monells, 17121 Girona, Spain; (A.A.); (M.D.G.); (I.M.)
| | - Sancho Bañón
- Department of Food Technology and Science and Nutrition, Veterinary Faculty, Regional Campus of International Excellence “Campus Mare Nostrum”, University of Murcia, 30100 Murcia, Spain; (M.K.); (F.J.G.-A.)
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Nan X, Kang T, Zhang Z, Wang X, Zhang J, Lei Y, Gao L, Cui J, Xu H. Flexible Symmetric-Defection Antenna with Bending and Thermal Insensitivity for Miniaturized UAV. Micromachines (Basel) 2024; 15:159. [PMID: 38276858 PMCID: PMC10818624 DOI: 10.3390/mi15010159] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Revised: 01/13/2024] [Accepted: 01/19/2024] [Indexed: 01/27/2024]
Abstract
Flexible conformal-enabled antennas have great potential for various developable surface-built unmanned aerial vehicles (UAVs) due to their superior mechanical compliance as well as maintaining excellent electromagnetic features. However, it remains a challenge that the antenna holds bending and thermal insensitivity to negligibly shift resonant frequency during conformal attachment and aerial flight, respectively. Here, we report a flexible symmetric-defection antenna (FSDA) with bending and thermal insensitivity. By engraving a symmetric defection on the reflective ground, the radiated unit attached to the soft polydimethylsiloxane (PDMS) makes the antenna resonate at the ISM microwave band (resonant frequency = 2.44 GHz) and conformal with a miniaturized UAV. The antenna is also insensitive to both the bending-conformal attachment (20 mm < r < 70 mm) and thermal radiation (20~100 °C) due to the symmetric peripheral-current field along the defection and the low-change thermal effect of the PDMS, respectively. Therefore, the antenna in a non-bending state almost keeps the same impedance matching and radiation when it is attached to a cylinder-back of a UAV. The flexible antenna with bending and thermal insensitivity will pave the way for more conformal or wrapping applications.
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Affiliation(s)
- Xueli Nan
- School of Automation and Software Engineering, Shanxi University, Taiyuan 030006, China; (X.N.); (T.K.); (X.W.); (J.Z.)
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, China
| | - Tongtong Kang
- School of Automation and Software Engineering, Shanxi University, Taiyuan 030006, China; (X.N.); (T.K.); (X.W.); (J.Z.)
| | - Zhonghe Zhang
- College of Electronics and Information Engineering, Shenzhen University, Shenzhen 518061, China;
| | - Xin Wang
- School of Automation and Software Engineering, Shanxi University, Taiyuan 030006, China; (X.N.); (T.K.); (X.W.); (J.Z.)
| | - Jiale Zhang
- School of Automation and Software Engineering, Shanxi University, Taiyuan 030006, China; (X.N.); (T.K.); (X.W.); (J.Z.)
| | - Yusheng Lei
- Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361102, China; (Y.L.); (L.G.)
| | - Libo Gao
- Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen 361102, China; (Y.L.); (L.G.)
| | - Jianli Cui
- School of Physics and Electronics Engineering, Yuncheng University, Yuncheng 044000, China
| | - Hongcheng Xu
- School of Instrument Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China
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Lack W, Jenkins S, Meo A, Chantrell RW, McKenna KM, Evans RFL. Thermodynamic properties and switching dynamics of perpendicular shape anisotropy MRAM. J Phys Condens Matter 2024; 36:145801. [PMID: 38157556 DOI: 10.1088/1361-648x/ad19a0] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Accepted: 12/28/2023] [Indexed: 01/03/2024]
Abstract
The power consumption of modern random access memory (RAM) has been a motivation for the development of low-power non-volatile magnetic RAM (MRAM). Based on a CoFeB/MgO magnetic tunnel junction, MRAM must satisfy high thermal stability and a low writing current while being scaled down to a sub-20 nm size to compete with the densities of current RAM technology. A recent development has been to exploit perpendicular shape anisotropy along the easy axis by creating tower structures, with the free layers' thickness (along the easy axis) being larger than its width. Here we use an atomistic model to explore the temperature dependent properties of thin cylindrical MRAM towers of 5 nm diameter while scaling down the free layer from 48 to 8 nm thick. We find thermal fluctuations are a significant driving force for the switching mechanism at operational temperatures by analysing the switching field distribution from hysteresis data. We find that a reduction of the free layer thickness below 18 nm rapidly loses shape anisotropy, and consequently stability, even at 0 K. Additionally, there is a change in the switching mechanism as the free layer is reduced to 8 nm. Coherent rotation is observed for the 8 nm free layer, while all taller towers demonstrate incoherent rotation via a propagated domain wall.
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Affiliation(s)
- Wayne Lack
- School of Physics, Engineering and Technology, University of York, York YO10 5DD, United Kingdom
| | - Sarah Jenkins
- School of Physics, Engineering and Technology, University of York, York YO10 5DD, United Kingdom
| | - Andrea Meo
- School of Physics, Engineering and Technology, University of York, York YO10 5DD, United Kingdom
| | - Roy W Chantrell
- School of Physics, Engineering and Technology, University of York, York YO10 5DD, United Kingdom
| | - Keith M McKenna
- School of Physics, Engineering and Technology, University of York, York YO10 5DD, United Kingdom
| | - Richard F L Evans
- School of Physics, Engineering and Technology, University of York, York YO10 5DD, United Kingdom
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7
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Rodríguez-Cobo L, Reyes-Gonzalez L, Algorri JF, Díez-del-Valle Garzón S, García-García R, López-Higuera JM, Cobo A. Non-Contact Thermal and Acoustic Sensors with Embedded Artificial Intelligence for Point-of-Care Diagnostics. Sensors (Basel) 2023; 24:129. [PMID: 38202998 PMCID: PMC10781379 DOI: 10.3390/s24010129] [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: 11/16/2023] [Revised: 12/22/2023] [Accepted: 12/23/2023] [Indexed: 01/12/2024]
Abstract
This work involves exploring non-invasive sensor technologies for data collection and preprocessing, specifically focusing on novel thermal calibration methods and assessing low-cost infrared radiation sensors for facial temperature analysis. Additionally, it investigates innovative approaches to analyzing acoustic signals for quantifying coughing episodes. The research integrates diverse data capture technologies to analyze them collectively, considering their temporal evolution and physical attributes, aiming to extract statistically significant relationships among various variables for valuable insights. The study delineates two distinct aspects: cough detection employing a microphone and a neural network, and thermal sensors employing a calibration curve to refine their output values, reducing errors within a specified temperature range. Regarding control units, the initial implementation with an ESP32 transitioned to a Raspberry Pi model 3B+ due to neural network integration issues. A comprehensive testing is conducted for both fever and cough detection, ensuring robustness and accuracy in each scenario. The subsequent work involves practical experimentation and interoperability tests, validating the proof of concept for each system component. Furthermore, this work assesses the technical specifications of the prototype developed in the preceding tasks. Real-time testing is performed for each symptom to evaluate the system's effectiveness. This research contributes to the advancement of non-invasive sensor technologies, with implications for healthcare applications such as remote health monitoring and early disease detection.
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Affiliation(s)
- Luís Rodríguez-Cobo
- CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III, 28029 Madrid, Spain; (L.R.-C.); (J.M.L.-H.); (A.C.)
| | - Luís Reyes-Gonzalez
- Photonics Engineering Group, University of Cantabria, 39005 Santander, Spain;
| | - José Francisco Algorri
- CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III, 28029 Madrid, Spain; (L.R.-C.); (J.M.L.-H.); (A.C.)
- Photonics Engineering Group, University of Cantabria, 39005 Santander, Spain;
- Instituto de Investigación Sanitaria Valdecilla (IDIVAL), 39011 Santander, Spain
| | - Sara Díez-del-Valle Garzón
- Ambar Telecomunicaciones S.L., 39011 Santander, Spain; (S.D.-d.-V.G.); (R.G.-G.)
- Centro de Innovación de Servicios Gestionados Avanzados (CiSGA) S.L., 39011 Santander, Spain
| | - Roberto García-García
- Ambar Telecomunicaciones S.L., 39011 Santander, Spain; (S.D.-d.-V.G.); (R.G.-G.)
- Centro de Innovación de Servicios Gestionados Avanzados (CiSGA) S.L., 39011 Santander, Spain
| | - José Miguel López-Higuera
- CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III, 28029 Madrid, Spain; (L.R.-C.); (J.M.L.-H.); (A.C.)
- Photonics Engineering Group, University of Cantabria, 39005 Santander, Spain;
- Instituto de Investigación Sanitaria Valdecilla (IDIVAL), 39011 Santander, Spain
| | - Adolfo Cobo
- CIBER de Bioingeniería, Biomateriales y Nanomedicina, Instituto de Salud Carlos III, 28029 Madrid, Spain; (L.R.-C.); (J.M.L.-H.); (A.C.)
- Photonics Engineering Group, University of Cantabria, 39005 Santander, Spain;
- Instituto de Investigación Sanitaria Valdecilla (IDIVAL), 39011 Santander, Spain
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McKenna ZJ, Nava RC, Magalhães C, Magalhães de Castro F, Machado Moreira C, Shibuya E, da Cunha I, Maia PA, Cauduro Roscani R, Rocha-Vieira E, Santiago Moraes Barros TM, Bitencourt D, Amorim FT. A comprehensive evaluation of heat stress and heat strain in a sample of sugarcane cutters in Brazil. J Appl Physiol (1985) 2023; 135:1431-1439. [PMID: 37916268 DOI: 10.1152/japplphysiol.00555.2023] [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: 08/09/2023] [Accepted: 10/27/2023] [Indexed: 11/03/2023] Open
Abstract
Sugarcane cutters are vulnerable to extreme heat and are at risk for heat-related illness and chronic kidney disease, potentially due to high heat strain. We performed a comprehensive assessment of the physiological demands of sugarcane cutters via measurements of metabolic, thermal, and cardiovascular responses. In addition, we assessed cross-shift changes in markers of kidney function. Nine male sugarcane cutters were monitored while working during the spring harvest season in Brazil. Core temperature (Tcore) and heart rate (HR) were continuously recorded, and oxygen consumption was measured during the work shift. Urine and blood samples were collected pre- and postwork shifts. Total sweat loss was calculated using body weight changes and adjusting for water ingestion and urine output. A wet-bulb globe temperature (WBGT) station was used to monitor environmental heat stress. WBGT was ≥30°C on 7 of the 8 study days. Mean and peak Tcore during the work shift were 37.96 ± 0.47°C and 38.60 ± 0.41°C, respectively, with all participants surpassing a Tcore of 38°C. Mean and peak HR during the work shift were 137 ± 14 and 164 ± 11 beats/min, respectively. Percent of maximal oxygen consumption was, on average, 53 ± 11%. Workers had a total sweat loss of 7.63 ± 2.31 L and ingested 6.04 ± 1.95 L of fluid. Kidney function (estimated glomerular filtration rate) was reduced from pre- to postwork shift (Δ -20 ± 18 mL·min·1.73 m2). We demonstrated that sugarcane cutters performing prolonged work during a period of high environmental heat stress display high levels of heat strain, high water turnover, and reduced kidney function.NEW & NOTEWORTHY We demonstrate that a shift of sugarcane cutting performed outdoors during the spring harvest season results in a high level of heat strain. In fact, all the studied workers sustained core temperatures above 38°C and heart rates above 75% of the measured maximum heart rate. Additionally, workers displayed a high water turnover with sweat loss close to 10% of their body weight. Finally, we report elevated muscle damage and reductions in kidney function following the work shift.
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Affiliation(s)
| | - Roberto C Nava
- University of New Mexico, Albuquerque, New Mexico, United States
| | - Caíque Magalhães
- Programa Multicêntrico de Pós-Graduação em Ciências Fisiológicas, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
| | - Flávio Magalhães de Castro
- University of New Mexico, Albuquerque, New Mexico, United States
- Programa Multicêntrico de Pós-Graduação em Ciências Fisiológicas, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
| | | | - Elisa Shibuya
- Fundação Jorge Duprat Figueiredo de Segurança e Medicina do Trabalho, São Paulo, Brazil
| | - Irlon da Cunha
- Fundação Jorge Duprat Figueiredo de Segurança e Medicina do Trabalho, São Paulo, Brazil
| | - Paulo Alves Maia
- Fundação Jorge Duprat Figueiredo de Segurança e Medicina do Trabalho, São Paulo, Brazil
| | | | - Etel Rocha-Vieira
- Programa Multicêntrico de Pós-Graduação em Ciências Fisiológicas, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
| | | | - Daniel Bitencourt
- Fundação Jorge Duprat Figueiredo de Segurança e Medicina do Trabalho, São Paulo, Brazil
| | - Fabiano T Amorim
- University of New Mexico, Albuquerque, New Mexico, United States
- Programa Multicêntrico de Pós-Graduação em Ciências Fisiológicas, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil
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Luque-Vilca OM, Pampa-Quispe NB, Pumacahua-Ramos A, Pilco-Quesada S, Cabel Moscoso DJ, Choque-Rivera TJ. Structural, Thermal, Rheological, and Morphological Characterization of the Starches of Sweet and Bitter Native Potatoes Grown in the Andean Region. Polymers (Basel) 2023; 15:4417. [PMID: 38006141 PMCID: PMC10674986 DOI: 10.3390/polym15224417] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 10/31/2023] [Accepted: 11/06/2023] [Indexed: 11/26/2023] Open
Abstract
This study aimed to extract and characterize the morphological, physicochemical, thermal, and rheological properties of the starches of native potatoes grown in the department of Puno. Among the varieties evaluated were sweet native potato varieties Imilla Negra (Solanum tuberosum spp. Andígena), Imilla Blanca (Solanum tuberosum spp. Andígena), Peruanita, Albina or Lomo (Solanum chaucha), and Sutamari, and the bitter potatoes Rucki or Luki (Solanum juzepczukii Buk), Locka (Solanum curtilobum), Piñaza (Solanum curtilobum), and Ocucuri (Sola-num curtilobum), acquired from the National Institute of Agrarian Innovation (INIA-Puno). The proximal composition, amylose content, and morphological, thermal, and rheological properties that SEM, DSC, and a rheometer determined, respectively, were evaluated, and the data obtained were statistically analyzed using a completely randomized design and then a comparison of means using Tukey's LSD test. The results show a significant difference in the proximal composition (p ≤ 0.05) concerning moisture content, proteins, fat, ash, and carbohydrates. Thus, the amylose content was also determined, ranging from 23.60 ± 0.10 to 30.33 ± 0.15%. The size morphology of the granules is 13.09-47.73 µm; for the thermal and rheological properties of the different varieties of potato starch, it is shown that the gelatinization temperature is in a range of 57 to 62 °C and, for enthalpy, between 3 and 5 J/g.
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Affiliation(s)
- Olivia Magaly Luque-Vilca
- Escuela Profesional de Ingeniería en Industrias Alimentarias, Universidad Nacional de Juliaca, Av Nueva Zelandia 631, Juliaca 21101, Peru; (O.M.L.-V.); (T.J.C.-R.)
| | - Noe Benjamin Pampa-Quispe
- Escuela Profesional de Ingeniería en Industrias Alimentarias, Universidad Nacional de Juliaca, Av Nueva Zelandia 631, Juliaca 21101, Peru; (O.M.L.-V.); (T.J.C.-R.)
| | - Augusto Pumacahua-Ramos
- Facultad de Ingeniería de Alimentos, Universidad Nacional Intercultural de Quillabamaba, Cusco 08741, Peru;
| | - Silvia Pilco-Quesada
- Facultad de Ingeniería y Arquitectura, Universidad Peruana Unión, km 19 Carretera Central, Ñaña, Lurigancho Lima 15457, Peru
| | | | - Tania Jakeline Choque-Rivera
- Escuela Profesional de Ingeniería en Industrias Alimentarias, Universidad Nacional de Juliaca, Av Nueva Zelandia 631, Juliaca 21101, Peru; (O.M.L.-V.); (T.J.C.-R.)
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Li B, Zhou L, Wang B, Yin M, Qian Y, Shi X, Guo Z, Han Z, Hu N, Sun L. Nanoscale Dispersion of Carbon Nanotubes in a Metal Matrix to Boost Thermal and Electrical Conductivity via Facile Ball Milling Techniques. Nanomaterials (Basel) 2023; 13:2815. [PMID: 37887965 PMCID: PMC10609409 DOI: 10.3390/nano13202815] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 10/12/2023] [Accepted: 10/20/2023] [Indexed: 10/28/2023]
Abstract
Carbon nanotube (CNT)/metal composites have attracted much attention due to their enhanced electrical and thermal performance. How to achieve the scalable fabrication of composites with efficient dispersion of CNTs to boost their performance remains a challenge for their wide realistic applications. Herein, the nanoscale dispersion of CNTs in the Stannum (Sn) matrix to boost thermal and electrical conductivity via facile ball milling techniques was demonstrated. The results revealed that CNTs were tightly attached to metal Sn, resulting in a much lower resistivity than that of bare Sn. The resistivity of Sn with 1 wt.% and 2 wt.% CNTs was 0.087 mΩ·cm and 0.056 mΩ·cm, respectively. The theoretical calculation showed that there was an electronic state near the Fermi level, suggesting its electrical conductivity had been improved to a certain extent. In addition, the thermal conductivity of Sn with 2 wt.% CNTs was 1.255 W·m-1·K-1. Moreover, Young's modulus of the composites with CNTs mass fraction of 10 wt.% had low values (0.933 MPa) under low strain conditions, indicating the composite shows good potential for various applications with different flexible requirements. The good electrical and thermal conductive CNT networks were formed in the metal matrix via facile ball milling techniques. This strategy can provide guidance for designing high-performance metal samples and holds a broad application potential in electronic packaging and other fields.
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Affiliation(s)
- Bin Li
- Research Center for Photovoltaics, Shanghai Institute of Space Power-Sources, Shanghai 200245, China; (B.L.); (L.Z.); (B.W.); (M.Y.); (Y.Q.); (X.S.); (Z.G.)
| | - Lihua Zhou
- Research Center for Photovoltaics, Shanghai Institute of Space Power-Sources, Shanghai 200245, China; (B.L.); (L.Z.); (B.W.); (M.Y.); (Y.Q.); (X.S.); (Z.G.)
| | - Bo Wang
- Research Center for Photovoltaics, Shanghai Institute of Space Power-Sources, Shanghai 200245, China; (B.L.); (L.Z.); (B.W.); (M.Y.); (Y.Q.); (X.S.); (Z.G.)
| | - Maoshu Yin
- Research Center for Photovoltaics, Shanghai Institute of Space Power-Sources, Shanghai 200245, China; (B.L.); (L.Z.); (B.W.); (M.Y.); (Y.Q.); (X.S.); (Z.G.)
| | - Yong Qian
- Research Center for Photovoltaics, Shanghai Institute of Space Power-Sources, Shanghai 200245, China; (B.L.); (L.Z.); (B.W.); (M.Y.); (Y.Q.); (X.S.); (Z.G.)
| | - Xianglei Shi
- Research Center for Photovoltaics, Shanghai Institute of Space Power-Sources, Shanghai 200245, China; (B.L.); (L.Z.); (B.W.); (M.Y.); (Y.Q.); (X.S.); (Z.G.)
| | - Zhejun Guo
- Research Center for Photovoltaics, Shanghai Institute of Space Power-Sources, Shanghai 200245, China; (B.L.); (L.Z.); (B.W.); (M.Y.); (Y.Q.); (X.S.); (Z.G.)
| | - Zhao Han
- Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), School of Electronics, Information and Electrical Engineering, Shanghai Jiao Tong University, Dong Chuan Road No. 800, Shanghai 200240, China;
| | - Nantao Hu
- Key Laboratory of Thin Film and Microfabrication Technology (Ministry of Education), School of Electronics, Information and Electrical Engineering, Shanghai Jiao Tong University, Dong Chuan Road No. 800, Shanghai 200240, China;
| | - Lijie Sun
- Research Center for Photovoltaics, Shanghai Institute of Space Power-Sources, Shanghai 200245, China; (B.L.); (L.Z.); (B.W.); (M.Y.); (Y.Q.); (X.S.); (Z.G.)
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11
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Bakhsh TA, Alfaifi A, Alghamdi Y, Nassar M, Abuljadyel RA. Thermal Sensing of Photo-Activated Dental Resin Composites Using Infrared Thermography. Polymers (Basel) 2023; 15:4117. [PMID: 37896360 PMCID: PMC10611355 DOI: 10.3390/polym15204117] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 10/10/2023] [Accepted: 10/13/2023] [Indexed: 10/29/2023] Open
Abstract
OBJECTIVE The goal of this study was to compare the pulp temperature increase during light curing of different composite thicknesses in deep class I cavities using two thermal sensing tools. METHODOLOGY Round occlusal class I cavities with a remaining dentin thickness (RDT) of 1 mm from the cavity floor were performed on 15 extracted sound molars. Samples were divided into three groups (n = 5). In group A, cavities were restored using the Filtek Z350 XT conventional composite through the incremental filling technique, whereas group B cavities were restored using the Filtek Bulk-Fill flowable composite through the bulk-fill technique. Specimens of the Filtek Bulk-Fill flowable composite using the incremental filling technique were used to restore cavities in group C. An infrared thermal camera (IRT; Flir, Wilsonville, OR, USA) and K-type thermocouple (Perfect Prime TC0520, New York, NY, USA) were used to measure the heat generated during composite photo-polymerization. RESULTS There were no significant differences within the same group using either the thermocouple or IRT (p > 0.05). One-way ANOVA showed no significant differences between groups A and C (p > 0.05), whereas group B was significantly different from groups A and C with each sensing tool (p < 0.05). CONCLUSION IRT and thermocouple heat readings were comparable. Based on the current findings, the bulk-fill technique resulted in the lowest heat generation among the groups. Therefore, increasing the light-curing time and the number of composite increments was directly correlated with increases in intra-pulpal temperature.
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Affiliation(s)
- Turki A. Bakhsh
- Restorative Dentistry Department, Faculty of Dentistry, King Abdulaziz University, P.O. Box 80209, Jeddah 215-89, Saudi Arabia;
- Cariology and Operative Dentistry, Tokyo Medical and Dental University, Tokyo 113-8549, Japan
- Advanced Technology Dental Research Laboratory, Faculty of Dentistry, King Abdulaziz University, P.O. Box 80209, Jeddah 215-89, Saudi Arabia; (A.A.); (Y.A.)
| | - Abdulaziz Alfaifi
- Advanced Technology Dental Research Laboratory, Faculty of Dentistry, King Abdulaziz University, P.O. Box 80209, Jeddah 215-89, Saudi Arabia; (A.A.); (Y.A.)
| | - Yousef Alghamdi
- Advanced Technology Dental Research Laboratory, Faculty of Dentistry, King Abdulaziz University, P.O. Box 80209, Jeddah 215-89, Saudi Arabia; (A.A.); (Y.A.)
| | - Mohannad Nassar
- Department of Preventive and Restorative Dentistry, College of Dental Medicine, University of Sharjah, Sharjah P.O. Box 27272, United Arab Emirates;
| | - Roaa A. Abuljadyel
- Restorative Dentistry Department, Faculty of Dentistry, King Abdulaziz University, P.O. Box 80209, Jeddah 215-89, Saudi Arabia;
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12
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Şentürk A, Aysan E. A New Technique for Localization of Parathyroid Adenoma: Infrared Thermal Scanning of the Neck. Cureus 2023; 15:e47977. [PMID: 38034183 PMCID: PMC10686241 DOI: 10.7759/cureus.47977] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/30/2023] [Indexed: 12/02/2023] Open
Abstract
Many radiological techniques are used to locate the adenoma preoperatively in cases of primary hyperparathyroidism, but the location of many adenomas still cannot be detected. Since adenomas are hypervascular lesions, their temperature is high. Infrared thermal scanning can reveal local temperature differences in hypervascular lesions. The location of the adenoma could not be determined by preoperative radiological examinations in a 58-year-old male patient who was scheduled for surgery with the diagnosis of primary hyperparathyroidism. By infrared thermal scanning, a nearly 2°F higher temperature was measured in the inferior of the right thyroid lobe compared to the other perithyroidal regions. During the exploration, the adenoma was found at this point and removed. Infrared thermal scanning of the neck is promising as a new technique that can be used both preoperatively and intraoperatively to locate the adenoma in primary hyperparathyroidism cases.
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Affiliation(s)
- Adem Şentürk
- Surgical Oncology, Sakarya Training and Research Hospital, Sakarya, TUR
| | - Erhan Aysan
- General Surgery, Yeditepe University Faculty of Medicine, Istanbul, TUR
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13
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Kuo DMT. Thermal rectification through the topological states of asymmetrical length armchair graphene nanoribbons heterostructures with vacancies. Nanotechnology 2023; 34:505401. [PMID: 37703858 DOI: 10.1088/1361-6528/acf93a] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2023] [Accepted: 09/12/2023] [Indexed: 09/15/2023]
Abstract
We present a theoretical investigation of electron heat current in asymmetrical length armchair graphene nanoribbon (AGNR) heterostructures with vacancies, focusing on the topological states (TSs). In particular, we examine the 9-7-9 AGNR heterostructures where the TSs are well-isolated from the conduction and valence subbands. This isolation effectively mitigates thermal noise of subbands arising from temperature fluctuations during charge transport. Moreover, when the TSs exhibit an orbital off-set, intriguing electron heat rectification phenomena are observed, primarily attributed to inter-TS electron Coulomb interactions. To enhance the heat rectification ratio (ηQ), we manipulate the coupling strengths between the heat sources and the TSs by introducing asymmetrical lengths in the 9-AGNRs. This approach offers control over the rectification properties, enabling significant enhancements. Additionally, we introduce vacancies strategically positioned between the heat sources and the TSs to suppress phonon heat current. This arrangement effectively reduces the overall phonon heat current, while leaving the TSs unaffected. Our findings provide valuable insights into the behavior of electron heat current in AGNR heterostructures, highlighting the role of topological states, inter-TS electron Coulomb interactions, and the impact of structural modifications such as asymmetrical lengths and vacancy positioning. These results pave the way for the design and optimization of graphene-based devices with improved thermal management and efficient control of electron heat transport.
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Affiliation(s)
- David M T Kuo
- Department of Electrical Engineering and Department of Physics, National Central University, Chungli, 320, Taiwan
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14
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Akrout M, Ben Difallah B, Kharrat M, Dammak M, Pereira A, Oliveira FJ, Duarte I. On the Structural, Thermal, Micromechanical and Tribological Characterizations of Cu-Filled Acrylonitrile Butadiene Styrene Micro-Composites. Materials (Basel) 2023; 16:6428. [PMID: 37834565 PMCID: PMC10573974 DOI: 10.3390/ma16196428] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Revised: 09/17/2023] [Accepted: 09/25/2023] [Indexed: 10/15/2023]
Abstract
The purpose of this work was to investigate the structural, thermal, micromechanical and tribological properties of novel polymer/metal composite materials for bearing applications. Copper (Cu)-filled Acrylonitrile Butadiene Styrene (ABS) composites were mixed in a laboratory scale by an internal mixer with two blade impellers, and then injection-molded. Neat ABS, ABS+5wt% Cu, ABS+10wt% Cu, and ABS+15wt% Cu were the four materials that were tested. The dispersion of Cu particles in the ABS matrix was investigated using Scanning Electron Microscopy (SEM) and a micro-tomography scan. The filler particles have a uniform distribution in the matrix, according to the observations. The incorporation of Cu filler also refined an increase in the glass transition temperature from Differential Scanning Calorimetry (DSC) and less intensity in the amorphous phase by X-ray diffraction (XRD). Nanoindentation tests were carried out to characterize the micro-mechanical behavior of the composites. Friction and wear analysis were also examined using a pin-on-disk tribometer. Compared with neat ABS, all the micro-composites showed much higher indentation hardness, Vickers hardness, and indentation elastic modulus. It was also concluded that the incorporation of Cu filler into ABS simultaneously improved the friction and wear properties of the composites, which contributed to the suitability of the micro-filled composites with hard metallic particles for a wider range of mechanical components for bearing applications.
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Affiliation(s)
- Mabrouka Akrout
- Laboratory of Electromechanical Systems, National School of Engineers of Sfax, University of Sfax, Soukra Road, Km 3.5, PO Box 1173, Sfax 3038, Tunisia; (M.A.); (B.B.D.); (M.D.)
| | - Basma Ben Difallah
- Laboratory of Electromechanical Systems, National School of Engineers of Sfax, University of Sfax, Soukra Road, Km 3.5, PO Box 1173, Sfax 3038, Tunisia; (M.A.); (B.B.D.); (M.D.)
| | - Mohamed Kharrat
- Laboratory of Electromechanical Systems, National School of Engineers of Sfax, University of Sfax, Soukra Road, Km 3.5, PO Box 1173, Sfax 3038, Tunisia; (M.A.); (B.B.D.); (M.D.)
| | - Maher Dammak
- Laboratory of Electromechanical Systems, National School of Engineers of Sfax, University of Sfax, Soukra Road, Km 3.5, PO Box 1173, Sfax 3038, Tunisia; (M.A.); (B.B.D.); (M.D.)
| | - António Pereira
- Department of Mechanical Engineering, Centre for Mechanical Technology and Automation (TEMA), University of Aveiro, 3810-193 Aveiro, Portugal; (A.P.); (I.D.)
- LASI—Intelligent Systems Associate Laboratory, 4800-058 Guimarães, Portugal
| | - Filipe J. Oliveira
- CICECO, Department of Materials Engineering and Ceramics, University of Aveiro, 3810-193 Aveiro, Portugal;
| | - Isabel Duarte
- Department of Mechanical Engineering, Centre for Mechanical Technology and Automation (TEMA), University of Aveiro, 3810-193 Aveiro, Portugal; (A.P.); (I.D.)
- LASI—Intelligent Systems Associate Laboratory, 4800-058 Guimarães, Portugal
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van Manen BR, Sluiter V, Mersha AY. FirebotSLAM: Thermal SLAM to Increase Situational Awareness in Smoke-Filled Environments. Sensors (Basel) 2023; 23:7611. [PMID: 37688067 PMCID: PMC10490787 DOI: 10.3390/s23177611] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Revised: 08/20/2023] [Accepted: 08/31/2023] [Indexed: 09/10/2023]
Abstract
Operating in extreme environments is often challenging due to the lack of perceptual knowledge. During fire incidents in large buildings, the extreme levels of smoke can seriously impede a firefighter's vision, potentially leading to severe material damage and loss of life. To increase the safety of firefighters, research is conducted in collaboration with Dutch fire departments into the usability of Unmanned Ground Vehicles to increase situational awareness in hazardous environments. This paper proposes FirebotSLAM, the first algorithm capable of coherently computing a robot's odometry while creating a comprehensible 3D map solely using the information extracted from thermal images. The literature showed that the most challenging aspect of thermal Simultaneous Localization and Mapping (SLAM) is the extraction of robust features in thermal images. Therefore, a practical benchmark of feature extraction and description methods was performed on datasets recorded during a fire incident. The best-performing combination of extractor and descriptor is then implemented into a state-of-the-art visual SLAM algorithm. As a result, FirebotSLAM is the first thermal odometry algorithm able to perform global trajectory optimization by detecting loop closures. Finally, FirebotSLAM is the first thermal SLAM algorithm to be tested in a fiery environment to validate its applicability in an operational scenario.
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Affiliation(s)
- Benjamin Ronald van Manen
- Smart Mechatronics And RoboTics (SMART) Research Group, Saxion University of Applied Sciences, Ariënsplein 1-300, 7511 JX Enschede, The Netherlands; (V.S.); (A.Y.M.)
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Mapossa AB, da Silva Júnior AH, de Oliveira CRS, Mhike W. Thermal, Morphological and Mechanical Properties of Multifunctional Composites Based on Biodegradable Polymers/Bentonite Clay: A Review. Polymers (Basel) 2023; 15:3443. [PMID: 37631500 PMCID: PMC10458906 DOI: 10.3390/polym15163443] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 08/07/2023] [Accepted: 08/15/2023] [Indexed: 08/27/2023] Open
Abstract
The extensive use of non-biodegradable plastic products has resulted in significant environmental problems caused by their accumulation in landfills and their proliferation into water bodies. Biodegradable polymers offer a potential solution to mitigate these issues through the utilization of renewable resources which are abundantly available and biodegradable, making them environmentally friendly. However, biodegradable polymers face challenges such as relatively low mechanical strength and thermal resistance, relatively inferior gas barrier properties, low processability, and economic viability. To overcome these limitations, researchers are investigating the incorporation of nanofillers, specifically bentonite clay, into biodegradable polymeric matrices. Bentonite clay is an aluminum phyllosilicate with interesting properties such as a high cation exchange capacity, a large surface area, and environmental compatibility. However, achieving complete dispersion of nanoclays in polymeric matrices remains a challenge due to these materials' hydrophilic and hydrophobic nature. Several methods are employed to prepare polymer-clay nanocomposites, including solution casting, melt extrusion, spraying, inkjet printing, and electrospinning. Biodegradable polymeric nanocomposites are versatile and promising in various industrial applications such as electromagnetic shielding, energy storage, electronics, and flexible electronics. Additionally, combining bentonite clay with other fillers such as graphene can significantly reduce production costs compared to the exclusive use of carbon nanotubes or metallic fillers in the matrix. This work reviews the development of bentonite clay-based composites with biodegradable polymers for multifunctional applications. The composition, structure, preparation methods, and characterization techniques of these nanocomposites are discussed, along with the challenges and future directions in this field.
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Affiliation(s)
- António Benjamim Mapossa
- Department of Chemical Engineering, University of Pretoria, Lynnwood Road, Pretoria 0002, South Africa
| | - Afonso Henrique da Silva Júnior
- Department of Chemical Engineering and Food Engineering, Federal University of Santa Catarina, Florianópolis 88037-000, SC, Brazil
| | | | - Washington Mhike
- Polymer Technology Division, Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Pretoria 0183, South Africa
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Sanchaniya JV, Lasenko I, Kanukuntala SP, Smogor H, Viluma-Gudmona A, Krasnikovs A, Tipans I, Gobins V. Mechanical and Thermal Characterization of Annealed Oriented PAN Nanofibers. Polymers (Basel) 2023; 15:3287. [PMID: 37571181 PMCID: PMC10422648 DOI: 10.3390/polym15153287] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Revised: 07/31/2023] [Accepted: 08/01/2023] [Indexed: 08/13/2023] Open
Abstract
Polyacrylonitrile (PAN) nanofibers have extensive applications as filters in various fields, including air and water filtration, biofluid purification, and the removal of toxic compounds and hazardous pollutants from contaminated water. This research focuses on investigating the impacts of annealing on the mechanical and thermal characteristics of oriented PAN nanofibers produced through the electrospinning of a PAN solution. The nanofiber mats were subjected to annealing temperatures ranging from 70 °C to 350 °C and characterized using a tensile test machine, thermogravimetry, differential scanning calorimetry, and scanning electron microscopy (SEM). The study aimed to examine the tensile strength in the transverse and longitudinal directions, Young's modulus, and glass transition temperatures of PAN nanofiber mats. The results indicate that, upon annealing, the diameter of the nanofibers decreased by approximately 20%, while the tensile strength increased in the longitudinal and transverse directions by 32% and 23%, respectively. Furthermore, the annealing temperature influenced the glass transition temperature of the nanofiber mats, which exhibited a 6% decrease at 280 °C, while the degradation temperature showed a slight increase of 3.5% at 280 °C. The findings contribute to a better understanding of the effects of annealing on PAN nanofiber mats, facilitating their potential for various filtration applications.
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Affiliation(s)
- Jaymin Vrajlal Sanchaniya
- Mechanics and Biotextile Research Laboratory, Riga Technical University, 3/3-20 Pulka Street, LV-1007 Riga, Latvia; (I.L.)
- Department of Theoretical Mechanics and Strength of Materials, Riga Technical University, 6B Kipsala Street, LV-1048 Riga, Latvia
| | - Inga Lasenko
- Mechanics and Biotextile Research Laboratory, Riga Technical University, 3/3-20 Pulka Street, LV-1007 Riga, Latvia; (I.L.)
| | - Sai Pavan Kanukuntala
- Mechanics and Biotextile Research Laboratory, Riga Technical University, 3/3-20 Pulka Street, LV-1007 Riga, Latvia; (I.L.)
- Department of Theoretical Mechanics and Strength of Materials, Riga Technical University, 6B Kipsala Street, LV-1048 Riga, Latvia
| | - Hilary Smogor
- NETZSCH Instrumenty, Halicka 9, 31-036 Krakow, Poland
| | - Arta Viluma-Gudmona
- Mechanics and Biotextile Research Laboratory, Riga Technical University, 3/3-20 Pulka Street, LV-1007 Riga, Latvia; (I.L.)
| | - Andrejs Krasnikovs
- Department of Theoretical Mechanics and Strength of Materials, Riga Technical University, 6B Kipsala Street, LV-1048 Riga, Latvia
| | - Igors Tipans
- Department of Theoretical Mechanics and Strength of Materials, Riga Technical University, 6B Kipsala Street, LV-1048 Riga, Latvia
| | - Valters Gobins
- Laboratory of Environmental Genetics, Institute of Biology, Faculty of Biology, Latvian University, Jelgavas Street 1, LV-1004 Riga, Latvia
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Low LYH, Baig MN, McCabe JP. Thermal Generation in Spinal Surgery: Does Rate of Irrigation Matter During Anterior Cervical Discectomy? Int J Spine Surg 2023; 17:542-546. [PMID: 37080718 PMCID: PMC10478695 DOI: 10.14444/8471] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/22/2023] Open
Abstract
BACKGROUND High-speed rotational burring is considered the mainstay of modern spinal decompression surgery. However, high-energy burrs generate significant heat due to the friction between the bone and the rotating burr. This study determines the effects of automated irrigation rate on burr tip temperatures either with a serrated steel burr or diamond-coated burr during anterior cervical discectomy and fusion (ACDF). METHODS This is an observational study of the routine practice of a single surgeon for 20 patients aged 18 years or older undergoing elective single- or multilevel ACDF. Various continuous irrigation rates of 0, 0.5, 1.0, or 2.0 cc/min were used. Forward-looking infrared thermography was used to measure the burr tip temperatures. The Midas Rex Legend EHS (Medtronic, PLC, Minneapolis, MN) stylus high-speed surgical drill was used with 3-mm burrs (diamond-coated and carbide-serrated steel) paired to the Medtronic Integrated Power Console set at 60,000 rpm. RESULTS The 0.5-cc/min irrigation rate kept the maximum burr temperatures below 45°C (P < .001). With no irrigation (0 cc/min), the steel burrs reached a maximum of 141°C, and the diamond-coated burrs reached 177°C, which was the only significant difference related to the burr materials (P = 0.0354). With irrigation rates of 0.5 cc/min and above, the maximum recorded temperature for steel burrs was 40.6°C, and the maximum temperature for diamond-coated burrs was 38.9°C. Irrigation rates greater than 0.5 cc/min yielded little additional benefit. CONCLUSION This study highlights the importance of adequate irrigation during high-speed burr drilling. Continuous irrigation is recommended even as low as 0.5 cc/min. It is good operative practice to reduce the risk of heat transmission to surrounding tissues, especially considering the proximity of cervical spinal nerve roots during uncoforaminal decompression. LEVEL OF EVIDENCE: 3
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Affiliation(s)
- Lyndon Y H Low
- Spine Service, Galway University Hospitals, Galway, Ireland
| | | | - John P McCabe
- Spine Service, Galway University Hospitals, Galway, Ireland
- School of Medicine, University of Galway, Galway, Ireland
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Dawlings FME, Mackay C, Humphrey M, Mitchell WF, Sorrell KJ, Sanchez S, Viola BM, Clarke RH. Portable thermal scanners to detect and monitor small endotherms: A comparative assessment of available equipment to guide practitioners. Ecol Evol 2023; 13:e10331. [PMID: 37484932 PMCID: PMC10361347 DOI: 10.1002/ece3.10331] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Accepted: 07/03/2023] [Indexed: 07/25/2023] Open
Abstract
Detection is essential to studying and monitoring wild animals; however, detection is challenging for small endotherms that are nocturnal or best detected at night. Techniques such as trapping or spotlighting disturb focal species, and the effectiveness of spotlighting can be limited for cryptic species, resulting in low detection rates that hinder our ability to monitor and study some endotherms at night. Thermal scanners detect infrared wavelengths not otherwise visible to humans. With improvements in equipment size and cost, thermal scanners have emerged as a valuable tool for passive detection of endotherms. Here we seek to provide objective guidance on thermal tool selection to practitioners who wish to adopt such tools to detect and monitor small endotherms. We compared the efficacy of three handheld thermal scanners (of varying resolutions) and a traditional spotlight for detecting small, cryptic endotherms at night. Random arrays of artificially heated small bird models (representing small, cryptic endotherms) were established along transects in native grasslands that support a range of small threatened endotherms, including the Critically Endangered Plains-wanderer (Pedionomus torquatus). Transects were independently surveyed by five observers, blind to model locations and model density. Performance measures representing detection capability were assessed for all devices, and usability of each device was assessed with a survey completed by all observers. Detection rates, detection distances, and survey accuracy were greater for thermal scanners with resolutions of 320 × 240 and 640 × 480 than for the spotlight. A low-resolution thermal scope (160 × 120) performed poorly for all performance measures. There was a consensus among users that a video camera-style thermal scanner was most comfortable to hold and view while traversing the transect, as opposed to thermal scopes where users look directly through the lens. These results suggest that high-resolution thermal scanners (≥320 × 240) provide improved detection capabilities compared to traditional spotlights. Higher detection rates provide opportunities for detecting and monitoring small endotherms at night where this was once difficult or impossible.
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Affiliation(s)
| | - Claire Mackay
- School of Biological SciencesMonash UniversityClaytonVictoriaAustralia
| | - Morgan Humphrey
- School of Biological SciencesMonash UniversityClaytonVictoriaAustralia
| | | | - Karina J. Sorrell
- School of Biological SciencesMonash UniversityClaytonVictoriaAustralia
| | - Sonia Sanchez
- School of Biological SciencesMonash UniversityClaytonVictoriaAustralia
| | - Benjamin M. Viola
- School of Biological SciencesMonash UniversityClaytonVictoriaAustralia
| | - Rohan H. Clarke
- School of Biological SciencesMonash UniversityClaytonVictoriaAustralia
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20
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Shoham Y, Krieger Y, Goverman J. Anacaulase-bcdb for the treatment of severe thermal burns. Expert Opin Biol Ther 2023; 23:1185-1191. [PMID: 37833828 DOI: 10.1080/14712598.2023.2270903] [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: 07/12/2023] [Accepted: 10/11/2023] [Indexed: 10/15/2023]
Abstract
INTRODUCTION Accurate burn depth assessment and early excision of burn eschar with maximal dermal preservation are key concepts in the optimal care of burn injury. Although excision with knife has long since been standard of care, a newer technique for wound bed preparation utilizing a bromelain-based enzyme has gained popularity worldwide and may offer several advantages. AREAS COVERED Here we report the pharmacologic properties, evidence for clinical efficacy, safety, and tolerability of anacaulase-bcdb for the treatment of deep partial thickness and full thickness burns. EXPERT OPINION Anacaulase-bcdb is a safe, non-surgical, selective eschar removal agent. It offers advantages over surgical excision of burn with knife and fulfills two unmet needs: burn depth assessment and dermal preservation during excision. Evidence supports a faster time to complete eschar removal; reduced number of operations; reduction in the amount of autografting, length of stay, and blood loss; prevention of burn induced compartment syndrome; and improved cosmetic outcome.
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Affiliation(s)
- Yaron Shoham
- Plastic and Reconstructive Surgery Department and Burn Unit, Soroka University Medical Center, Beer Sheba, Israel
- Plastic Surgery Department and Burn Unit, Ben-Gurion University of the Negev Faculty of Health Sciences, Plastic Surgery, Beer-Sheva, Israel
| | - Yuval Krieger
- Plastic and Reconstructive Surgery Department and Burn Unit, Soroka University Medical Center, Beer Sheba, Israel
- Plastic Surgery Department and Burn Unit, Ben-Gurion University of the Negev Faculty of Health Sciences, Plastic Surgery, Beer-Sheva, Israel
| | - Jeremy Goverman
- Mass General Brigham, Inc. Department of Surgery, Massachusetts General Hospital, Sumner Redstone Burn Center, Harvard Medical School, Boston, MA, USA
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21
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Liu J, Liu W, Thakur D, Mack J, Spina A, Montell C. Alleviation of thermal nociception depends on heat-sensitive neurons and a TRP channel in the brain. Curr Biol 2023:S0960-9822(23)00537-7. [PMID: 37201520 DOI: 10.1016/j.cub.2023.04.055] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 04/11/2023] [Accepted: 04/24/2023] [Indexed: 05/20/2023]
Abstract
Acute avoidance of dangerous temperatures is critical for animals to prevent or minimize injury. Therefore, surface receptors have evolved to endow neurons with the capacity to detect noxious heat so that animals can initiate escape behaviors. Animals including humans have evolved intrinsic pain-suppressing systems to attenuate nociception under some circumstances. Here, using Drosophila melanogaster, we uncovered a new mechanism through which thermal nociception is suppressed. We identified a single descending neuron in each brain hemisphere, which is the center for suppression of thermal nociception. These Epi neurons, for Epione-the goddess of soothing of pain-express a nociception-suppressing neuropeptide Allatostatin C (AstC), which is related to a mammalian anti-nociceptive peptide, somatostatin. Epi neurons are direct sensors for noxious heat, and when activated they release AstC, which diminishes nociception. We found that Epi neurons also express the heat-activated TRP channel, Painless (Pain), and thermal activation of Epi neurons and the subsequent suppression of thermal nociception depend on Pain. Thus, while TRP channels are well known to sense noxious temperatures to promote avoidance behavior, this work reveals the first role for a TRP channel for detecting noxious temperatures for the purpose of suppressing rather than enhancing nociception behavior in response to hot thermal stimuli.
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Affiliation(s)
- Jiangqu Liu
- Neuroscience Research Institute and Department of Molecular, Cellular and Developmental Biology, University of California, Santa Barbara, Santa Barbara, CA 93106, USA
| | - Weiwei Liu
- Neuroscience Research Institute and Department of Molecular, Cellular and Developmental Biology, University of California, Santa Barbara, Santa Barbara, CA 93106, USA
| | - Dhananjay Thakur
- Neuroscience Research Institute and Department of Molecular, Cellular and Developmental Biology, University of California, Santa Barbara, Santa Barbara, CA 93106, USA
| | - John Mack
- Neuroscience Research Institute and Department of Molecular, Cellular and Developmental Biology, University of California, Santa Barbara, Santa Barbara, CA 93106, USA
| | - Aidin Spina
- Neuroscience Research Institute and Department of Molecular, Cellular and Developmental Biology, University of California, Santa Barbara, Santa Barbara, CA 93106, USA
| | - Craig Montell
- Neuroscience Research Institute and Department of Molecular, Cellular and Developmental Biology, University of California, Santa Barbara, Santa Barbara, CA 93106, USA.
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22
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Zhang RY, Wild KH, Pottier P, Carrasco MI, Nakagawa S, Noble DWA. Developmental environments do not affect thermal physiological traits in reptiles: an experimental test and meta-analysis. Biol Lett 2023; 19:20230019. [PMID: 37161297 PMCID: PMC10170202 DOI: 10.1098/rsbl.2023.0019] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023] Open
Abstract
On a global scale, organisms face significant challenges due to climate change and anthropogenic disturbance. In many ectotherms, developmental and physiological processes are sensitive to changes in temperature and resources. Developmental plasticity in thermal physiology may provide adaptive advantages to environmental extremes if early environmental conditions are predictive of late-life environments. Here, we conducted a laboratory experiment to test how developmental temperature and maternal resource investment influence thermal physiological traits (critical thermal maximum: CTmax and thermal preference: Tpref) in a common skink (Lampropholis delicata). We then compared our experimental findings more broadly across reptiles (snakes, lizards and turtles) using meta-analysis. In both our experimental study and meta-analysis, we did not find evidence that developmental environments influence CTmax or Tpref. Furthermore, the effects of developmental environments on thermal physiology did not vary by age, taxon or climate zone (temperate/tropical). Overall, the magnitude of developmental plasticity on thermal physiology appears to be limited across reptile taxa suggesting that behavioural or evolutionary processes may be more important. However, there is a paucity of information across most reptile taxa, and a broader focus on thermal performance curves themselves will be critical in understanding the impacts of changing thermal conditions on reptiles in the future.
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Affiliation(s)
- Rose Y Zhang
- Division of Ecology and Evolution, Research School of Biology, The Australian National University, Canberra, ACT, 2600, Australia
| | - Kristoffer H Wild
- Division of Ecology and Evolution, Research School of Biology, The Australian National University, Canberra, ACT, 2600, Australia
| | - Patrice Pottier
- Evolution and Ecology Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW, 2050, Australia
| | - Maider Iglesias Carrasco
- Division of Ecology and Evolution, Research School of Biology, The Australian National University, Canberra, ACT, 2600, Australia
- Doñana Biological Station-Spanish Research Council CSIC, Seville, 41092, Spain
| | - Shinichi Nakagawa
- Evolution and Ecology Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW, 2050, Australia
| | - Daniel W A Noble
- Division of Ecology and Evolution, Research School of Biology, The Australian National University, Canberra, ACT, 2600, Australia
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Lerna M, Foti D, Petrella A, Sabbà MF, Mansour S. Effect of the Chemical and Mechanical Recycling of PET on the Thermal and Mechanical Response of Mortars and Premixed Screeds. Materials (Basel) 2023; 16:3155. [PMID: 37109991 PMCID: PMC10144017 DOI: 10.3390/ma16083155] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 04/13/2023] [Accepted: 04/14/2023] [Indexed: 06/19/2023]
Abstract
In this paper, recycled polyethylene terephthalate (PET) was used to produce eco-innovative engineering materials with optimized performance, minimizing the environmental impact deriving from plastic consumption activity and limiting the continuous consumption of raw materials. The recycled PET obtained from waste bottles, commonly used to improve the ductility of concrete, has been used with a different weight percentage as plastic aggregate in the replacement of sand in cement mortars and as fibers added to premixed screeds. In detail, the effect of PET treatment (chemical or mechanical) on the thermal performance was evaluated. Non-destructive physical tests were conducted to determine the thermal conductivity of the investigated building materials. The performed tests showed that chemically depolymerized PET aggregate and recycled PET fibers derived from plastic wastes can reduce the heat conduction capacity of the cementitious materials with limited reduction in compressive strength. The results of the experimental campaign have made it possible to evaluate the influence of the recycled material on the physical and mechanical properties and its feasibility in non-structural applications.
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Affiliation(s)
- Michela Lerna
- Department of Architecture, Construction and Design (DArCoD), Polytechnic University of Bari, 70125 Bari, Italy
| | - Dora Foti
- Department of Architecture, Construction and Design (DArCoD), Polytechnic University of Bari, 70125 Bari, Italy
| | - Andrea Petrella
- Department of Civil, Environmental, Land, Construction and Chemistry, Polytechnic University of Bari, 70125 Bari, Italy
| | - Maria Francesca Sabbà
- Department of Architecture, Construction and Design (DArCoD), Polytechnic University of Bari, 70125 Bari, Italy
| | - Sulyman Mansour
- Department of Architecture, Construction and Design (DArCoD), Polytechnic University of Bari, 70125 Bari, Italy
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24
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Kawata KHDS, Hirano K, Hamamoto Y, Oi H, Kanno A, Kawashima R, Sugiura M. Motivational decline and proactive response under thermal environmental stress are related to emotion- and problem-focused coping, respectively: Questionnaire construction and fMRI study. Front Behav Neurosci 2023; 17:1143450. [PMID: 37122493 PMCID: PMC10130452 DOI: 10.3389/fnbeh.2023.1143450] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Accepted: 03/21/2023] [Indexed: 05/02/2023] Open
Abstract
Despite the diversity of human behavioral and psychological responses to environmental thermal stress, the major dimensions of these responses have not been formulated. Accordingly, the relevance of these responses to a framework of coping with stress (i.e., emotion- and problem-focused) and the neural correlates are unexplored. In this study, we first developed a multidimensional inventory for such responses using social surveys and a factor analysis, and then examined the neural correlates of each dimension using a functional magnetic resonance imaging; we manipulated the ambient temperature between uncomfortably hot and cold, and the correlations between the inventory factor scores and discomfort-related neural responses were examined. We identified three factors to construct the inventory: motivational decline, proactive response, and an active behavior, which appeared to reflect inefficient emotion-focused coping, efficient problem-focused coping, and positive appreciation of extreme environmental temperatures, respectively, under environmental thermal stress. Motivational decline score was positively associated with common neural response to thermal stress in the frontal and temporoparietal regions, implicated in emotion regulation, while proactive response score negatively with the neural responses related to subjective discomfort in the medial and lateral parietal cortices, implicated in problem-solving. We thus demonstrated that two of three major dimensions of individual variation in response to and coping with environmental thermal stress conform to an influential two-dimensional framework of stress coping. The current three-dimensional model may expand the frontiers of meteorological human science in both basic and application domains.
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Affiliation(s)
- Kelssy Hitomi dos Santos Kawata
- Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan
- Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
- Graduate School of Interdisciplinary Information Studies, The University of Tokyo, Tokyo, Japan
| | - Kanan Hirano
- Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan
| | - Yumi Hamamoto
- Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan
| | - Hajime Oi
- Climate Control and Cooling System Engineering Group, Nissan Motor Co., Ltd., Atsugi, Japan
| | - Akitake Kanno
- Graduate School of Medicine, Tohoku University, Sendai, Japan
- Graduate School of Engineering, Tohoku University, Sendai, Japan
| | - Ryuta Kawashima
- Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan
| | - Motoaki Sugiura
- Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan
- International Research Institute of Disaster Science, Tohoku University, Sendai, Japan
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25
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Al Qudah M, Mohamed A, Lutfi S. Analysis of Facial Occlusion Challenge in Thermal Images for Human Affective State Recognition. Sensors (Basel) 2023; 23:3513. [PMID: 37050571 PMCID: PMC10098690 DOI: 10.3390/s23073513] [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] [Figures] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 03/11/2023] [Accepted: 03/15/2023] [Indexed: 06/19/2023]
Abstract
Several studies have been conducted using both visual and thermal facial images to identify human affective states. Despite the advantages of thermal facial images in recognizing spontaneous human affects, few studies have focused on facial occlusion challenges in thermal images, particularly eyeglasses and facial hair occlusion. As a result, three classification models are proposed in this paper to address the problem of thermal occlusion in facial images, with six basic spontaneous emotions being classified. The first proposed model in this paper is based on six main facial regions, including the forehead, tip of the nose, cheeks, mouth, and chin. The second model deconstructs the six main facial regions into multiple subregions to investigate the efficacy of subregions in recognizing the human affective state. The third proposed model in this paper uses selected facial subregions, free of eyeglasses and facial hair (beard, mustaches). Nine statistical features on apex and onset thermal images are implemented. Furthermore, four feature selection techniques with two classification algorithms are proposed for a further investigation. According to the comparative analysis presented in this paper, the results obtained from the three proposed modalities were promising and comparable to those of other studies.
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Affiliation(s)
- Mustafa Al Qudah
- School of Computer Sciences, Universiti Sains Malaysia, Gelugor 11800, Penang, Malaysia
- Department of Computer Science, College of Science and Humanities in Al-Sulail, Prince Sattam bin Abdulaziz University, Kharj 16278, Saudi Arabia
| | - Ahmad Mohamed
- School of Computer Sciences, Universiti Sains Malaysia, Gelugor 11800, Penang, Malaysia
| | - Syaheerah Lutfi
- School of Computer Sciences, Universiti Sains Malaysia, Gelugor 11800, Penang, Malaysia
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26
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Wu S, Lin S, Shi Z, Guo D, Huang H, Zhou X, Zhang D, Zhou K, Zhang W, Hu Y, Zhou C. Improved Thermal Stability and Film Uniformity of Halide Perovskite by Confinement Effect brought by Polymer Chains of Polyvinyl Pyrrolidone. Small 2023:e2207848. [PMID: 36929269 DOI: 10.1002/smll.202207848] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 02/22/2023] [Indexed: 06/18/2023]
Abstract
Polyvinyl pyrrolidone (PVP) is doped to PbI2 and organic salt during two-step growth of halideperovskite. It is observed that PVP molecules can interact with both PbI2 and organic salt, reduce the aggregation and crystallization of the two, and then slow down the coarsening rate of perovskite. As doping concentration increases from 0 to 1 mM in organic salt, average crystallite size of perovskite decreases monotonously from 90 to 34 nm; Surface fluctuation reduces from 259.9 to 179.8 nm at first, and then increases; Similarly, surface roughness decreases from 45.55 to 26.64 nm at first, and then rises. Accordingly, a kind of "confinement effect" is resolved to crystallite growth and surface fluctuation/roughness, which helps to build compact and uniform perovskite film. Density of trap states (t-DOS) is cut down by ≈60% at moderate doping (0.2 mM). Due to the "confinement effect", power conversion efficiency of perovskite solar cells is improved from 19.46 (±2.80) % to 21.50 (±0.99) %, and further improved to 24.11% after surface modification. Meanwhile, "confinement effect" strengthens crystallite/grain boundaries and improves thermal stability of both film and device. T80 of device increases to 120 h, compared to 50 h for reference ones.
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Affiliation(s)
- Shuyue Wu
- Hunan Key Laboratory of Super-microstructure and Ultrafast Process, Hunan Key Laboratory of Nanophotonics and Devices, Institute of Super-microstructure and Ultrafast Process in Advanced Materials (ISUPAM), School of Physics and Electronics, Central South University, Changsha, Hunan, 410083, P. R. China
| | - Siyuan Lin
- Hunan Key Laboratory of Super-microstructure and Ultrafast Process, Hunan Key Laboratory of Nanophotonics and Devices, Institute of Super-microstructure and Ultrafast Process in Advanced Materials (ISUPAM), School of Physics and Electronics, Central South University, Changsha, Hunan, 410083, P. R. China
| | - Zhiqiang Shi
- Hunan Key Laboratory of Super-microstructure and Ultrafast Process, Hunan Key Laboratory of Nanophotonics and Devices, Institute of Super-microstructure and Ultrafast Process in Advanced Materials (ISUPAM), School of Physics and Electronics, Central South University, Changsha, Hunan, 410083, P. R. China
| | - De'en Guo
- Hunan Key Laboratory of Super-microstructure and Ultrafast Process, Hunan Key Laboratory of Nanophotonics and Devices, Institute of Super-microstructure and Ultrafast Process in Advanced Materials (ISUPAM), School of Physics and Electronics, Central South University, Changsha, Hunan, 410083, P. R. China
| | - Han Huang
- Hunan Key Laboratory of Super-microstructure and Ultrafast Process, Hunan Key Laboratory of Nanophotonics and Devices, Institute of Super-microstructure and Ultrafast Process in Advanced Materials (ISUPAM), School of Physics and Electronics, Central South University, Changsha, Hunan, 410083, P. R. China
| | - Xuefan Zhou
- State Key Laboratory of Powder Metallurgy, Powder Metallurgy Research Institute, Central South University, Changsha, Hunan, 410083, P. R. China
| | - Dou Zhang
- State Key Laboratory of Powder Metallurgy, Powder Metallurgy Research Institute, Central South University, Changsha, Hunan, 410083, P. R. China
| | - Kechao Zhou
- State Key Laboratory of Powder Metallurgy, Powder Metallurgy Research Institute, Central South University, Changsha, Hunan, 410083, P. R. China
| | - Wenhao Zhang
- Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, P. R. China
| | - Yue Hu
- Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, P. R. China
| | - Conghua Zhou
- Hunan Key Laboratory of Super-microstructure and Ultrafast Process, Hunan Key Laboratory of Nanophotonics and Devices, Institute of Super-microstructure and Ultrafast Process in Advanced Materials (ISUPAM), School of Physics and Electronics, Central South University, Changsha, Hunan, 410083, P. R. China
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27
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Bakhsh AA. Optimization of Polyolefin-Bonded Hydroxyapatite Graphite for Sustainable Industrial Applications. Polymers (Basel) 2023; 15:polym15061505. [PMID: 36987286 PMCID: PMC10058556 DOI: 10.3390/polym15061505] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 03/11/2023] [Accepted: 03/15/2023] [Indexed: 03/30/2023] Open
Abstract
As a means of introducing environmental responsibility to industrial applications, the usage of biobased composite materials has been encouraged in recent years. Polymer nanocomposites utilize polyolefins increasingly as a matrix, owing to the diversity in their features and prospective applications, even though typical polyester blend materials, such as glass and composite materials, have garnered greater attention from researchers. The mineral hydroxy-apatite, or Ca10(PO4)6(OH)2, is the primary structural component of bone and tooth enamel. Increased bone density and strength result from this procedure. As a result, nanohms are fabricated from eggshells into rods with very tiny particle sizes. Although there have been many papers written on the benefits of HA-loaded polyolefins, the reinforcing effect of HA at low loadings has not yet been taken into account. The purpose of this work was to examine the mechanical and thermal characteristics of polyolefin-HA nanocomposites. These nanocomposites were built out of HDPE and LDPE (LDPE). As an extension of this work, we investigated what would happen when HA is added to LDPE composites at concentrations as high as 40% by weight. Carbonaceous fillers, including graphene, carbon nanotubes, carbon fibers, and exfoliated graphite, all play significant roles in nanotechnology owing to the extraordinary enhancements in their thermal, electrical, mechanical, and chemical properties. The purpose of this study was to examine the effects of adding a layered filler, such as exfoliated graphite (EG), to microwave zones that might have real-world applications for their mechanical, thermal, and electrical characteristics. Mechanical and thermal properties were significantly enhanced by the incorporation of HA, notwithstanding a minor decrease in these attributes at a loading of 40% HA by weight. A higher load-bearing capability of LLDPE matrices suggests their potential usage in biological contexts.
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Affiliation(s)
- Ahmed A Bakhsh
- Department of Industrial Engineering, Faculty of Engineering, King Abdulaziz University, Jeddah 21589, Saudi Arabia
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28
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Sorenson AE, Schaeffer PM. Real-Time Temperature Sensing Using a Ratiometric Dual Fluorescent Protein Biosensor. Biosensors (Basel) 2023; 13:338. [PMID: 36979550 PMCID: PMC10046200 DOI: 10.3390/bios13030338] [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] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 02/27/2023] [Accepted: 03/02/2023] [Indexed: 06/18/2023]
Abstract
Accurate temperature control within biological and chemical reaction samples and instrument calibration are essential to the diagnostic, pharmaceutical and chemical industries. This is particularly challenging for microlitre-scale reactions typically used in real-time PCR applications and differential scanning fluorometry. Here, we describe the development of a simple, inexpensive ratiometric dual fluorescent protein temperature biosensor (DFPTB). A combination of cycle three green fluorescent protein and a monomeric red fluorescent protein enabled the quantification of relative temperature changes and the identification of temperature discrepancies across a wide temperature range of 4-70 °C. The maximal sensitivity of 6.7% °C-1 and precision of 0.1 °C were achieved in a biologically relevant temperature range of 25-42 °C in standard phosphate-buffered saline conditions at a pH of 7.2. Good temperature sensitivity was achieved in a variety of biological buffers and pH ranging from 4.8 to 9.1. The DFPTB can be used in either purified or mixed bacteria-encapsulated formats, paving the way for in vitro and in vivo applications for topologically precise temperature measurements.
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29
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Schlaepfer CH, Flynn KJ, Polgreen PM, Erickson BA. Thermal Infrared Camera Imaging to Aid Necrotizing Soft Tissue Infections of the Genitalia Management. Urology 2023:S0090-4295(23)00175-9. [PMID: 36828267 DOI: 10.1016/j.urology.2022.12.056] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 12/19/2022] [Accepted: 12/26/2022] [Indexed: 02/24/2023]
Abstract
OBJECTIVE To determine if imaging with a thermal infrared camera might aid clinicians with diagnosis of equivocal necrotizing soft tissue infections of the genitalia (NSTIG) cases and help surgeons when determining appropriate surgical resection margins. MATERIALS/METHODS For twelve months at a single tertiary academic hospital, sequential patients already undergoing exploration for acute scrotum had preoperative photography with an infrared camera (FLIR C5). We compared infrared and standard preoperative photography with operative reports and postoperative photography to investigate if infrared photography corresponded with operative findings in severe scrotal infections - specifically the viability of the skin and the ultimate surgical resection margins. RESULTS A total of 16 patients were included. The pre-operative infrared photos directly correlated with resection margins in 13 of 16 (81%) patients. Notably, areas with a relatively lower (cooler) infrared intensity corresponded well to both visibly necrotic tissue when discrete and areas with large underlying fluid collections. Diffuse warm signal relative to surrounding skin correlated with cellulitis and viable skin. CONCLUSIONS In this observational study, infrared photography corresponded well with physical exam and operative findings. There may be a role for augmented temperature photography in the diagnosis and triage of scrotal infections. More research with standardized temperature gating of infrared signal and controls with normal or nonacute scrotums are needed to elucidate the clinical utility for infrared photograph.
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Affiliation(s)
| | - Kevin J Flynn
- University of Iowa Carver College of Medicine, Department of Urology
| | - Philip M Polgreen
- University of Iowa Carver College of Medicine, Department of Urology; University of Iowa, Carver College of Medicine, Department of Internal Medicine, Division of Infectious Disease
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30
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Álvarez-Noriega M, Marrable I, Noonan SHC, Barneche DR, Ortiz JC. Highly conserved thermal performance strategies may limit adaptive potential in corals. Proc Biol Sci 2023; 290:20221703. [PMID: 36629109 PMCID: PMC9832572 DOI: 10.1098/rspb.2022.1703] [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: 08/29/2022] [Accepted: 12/12/2022] [Indexed: 01/12/2023] Open
Abstract
Increasing seawater temperatures are expected to have profound consequences for reef-building corals' physiology. Understanding how demography changes in response to chronic exposure to warming will help forecast how coral communities will respond to climate change. Here, we measure growth rates of coral fragments of four common species, while exposing them to temperatures ranging from 19°C to 31°C for one month to calibrate their thermal-performance curves (TPCs). Our results show that, while there are contrasting differences between species, the shape of the TPCs was remarkably consistent among individuals of the same species. The low variation in thermal sensitivity within species may imply a reduced capacity for rapid adaptive responses to future changes in thermal regimes. Additionally, interspecific differences in thermal responses show a negative relationship between maximum growth and thermal optima, contradicting expectations derived from the classic 'warmer-is-better' hypothesis. Among species, there was a trade-off between current and future growth, whereby most species perform well under current thermal regimes but are susceptible to future increases in temperature. Increases in water temperature with climate change are likely to reduce growth rates, further hampering future coral reef recovery rates and potentially altering community composition.
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Affiliation(s)
| | - Isabella Marrable
- Australian Institute of Marine Science, PMB 3, Townsville MC, Queensland 4810, Australia
| | - Sam H. C. Noonan
- Australian Institute of Marine Science, PMB 3, Townsville MC, Queensland 4810, Australia
| | - Diego R. Barneche
- Australian Institute of Marine Science, Crawley, Western Australia 6009, Australia
- Oceans Institute, The University of Western Australia, Crawley, Western Australia 6009, Australia
| | - Juan C. Ortiz
- Australian Institute of Marine Science, PMB 3, Townsville MC, Queensland 4810, Australia
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31
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Sharma N, Banerjee BP, Hayden M, Kant S. An Open-Source Package for Thermal and Multispectral Image Analysis for Plants in Glasshouse. Plants (Basel) 2023; 12:317. [PMID: 36679030 PMCID: PMC9866171 DOI: 10.3390/plants12020317] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Revised: 01/03/2023] [Accepted: 01/06/2023] [Indexed: 06/17/2023]
Abstract
Advanced plant phenotyping techniques to measure biophysical traits of crops are helping to deliver improved crop varieties faster. Phenotyping of plants using different sensors for image acquisition and its analysis with novel computational algorithms are increasingly being adapted to measure plant traits. Thermal and multispectral imagery provides novel opportunities to reliably phenotype crop genotypes tested for biotic and abiotic stresses under glasshouse conditions. However, optimization for image acquisition, pre-processing, and analysis is required to correct for optical distortion, image co-registration, radiometric rescaling, and illumination correction. This study provides a computational pipeline that optimizes these issues and synchronizes image acquisition from thermal and multispectral sensors. The image processing pipeline provides a processed stacked image comprising RGB, green, red, NIR, red edge, and thermal, containing only the pixels present in the object of interest, e.g., plant canopy. These multimodal outputs in thermal and multispectral imageries of the plants can be compared and analysed mutually to provide complementary insights and develop vegetative indices effectively. This study offers digital platform and analytics to monitor early symptoms of biotic and abiotic stresses and to screen a large number of genotypes for improved growth and productivity. The pipeline is packaged as open source and is hosted online so that it can be utilized by researchers working with similar sensors for crop phenotyping.
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Affiliation(s)
- Neelesh Sharma
- Agriculture Victoria, Grains Innovation Park, 110 Natimuk Rd, Horsham, VIC 3400, Australia
| | - Bikram Pratap Banerjee
- Agriculture Victoria, Grains Innovation Park, 110 Natimuk Rd, Horsham, VIC 3400, Australia
| | - Matthew Hayden
- AgriBio, Centre for AgriBioscience, Agriculture Victoria, 5 Ring Road, Melbourne, VIC 3083, Australia
- School of Applied Systems Biology, La Trobe University, Melbourne, VIC 3083, Australia
| | - Surya Kant
- Agriculture Victoria, Grains Innovation Park, 110 Natimuk Rd, Horsham, VIC 3400, Australia
- AgriBio, Centre for AgriBioscience, Agriculture Victoria, 5 Ring Road, Melbourne, VIC 3083, Australia
- School of Applied Systems Biology, La Trobe University, Melbourne, VIC 3083, Australia
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Mendoza-Duarte ME, Estrada-Moreno IA, López-Martínez EI, Vega-Rios A. Effect of the Addition of Different Natural Waxes on the Mechanical and Rheological Behavior of PLA-A Comparative Study. Polymers (Basel) 2023; 15:polym15020305. [PMID: 36679186 PMCID: PMC9866918 DOI: 10.3390/polym15020305] [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] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 12/24/2022] [Accepted: 12/30/2022] [Indexed: 01/11/2023] Open
Abstract
In this study, poly(lactic acid) (PLA) blended with different natural waxes (beeswax, candelilla, carnauba, and cocoa) was investigated. Different wax amounts, 3, 5, 10, and 15 wt%, were incorporated into the PLA using a Brabender internal mixer. The blends were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), rotational rheometer (RR), dynamic mechanical analysis (DMA), and contact angle to observe the effect of the different waxes on the PLA physicochemical, rheological, mechanical behavior, and wetting properties. The complex viscosity of the blends was studied by employing a RR. The effect of the addition of the waxes on the mechanical properties of PLA was evaluated by DMA in the tension modality. A slight decrease in the thermal stability of PLA was observed with the addition of the waxes. However, in the case of the mechanical properties, the cocoa wax showed a considerable effect, especially in the elongation at break of PLA. Likewise, waxes had an essential impact on the water affinity of PLA. Specifically, with the addition of cocoa, the PLA became more hydrophilic, while the rest of the waxes increased the hydrophobic character.
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Affiliation(s)
- Mónica Elvira Mendoza-Duarte
- Centro de Investigación en Materiales Avanzados, SC, Av. Miguel de Cervantes #120, Chihuahua 31136, Mexico
- Correspondence: (M.E.M.-D.); (A.V.-R.)
| | | | | | - Alejandro Vega-Rios
- Centro de Investigación en Materiales Avanzados, SC, Av. Miguel de Cervantes #120, Chihuahua 31136, Mexico
- Correspondence: (M.E.M.-D.); (A.V.-R.)
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Marchant ED, Nelson WB, Hyldahl RD, Gifford JR, Hancock CR. Passive heat stress induces mitochondrial adaptations in skeletal muscle. Int J Hyperthermia 2023; 40:2205066. [PMID: 37106474 DOI: 10.1080/02656736.2023.2205066] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023] Open
Abstract
The mitochondria are central to skeletal muscle metabolic health. Impaired mitochondrial function is associated with various muscle pathologies, including insulin resistance and muscle atrophy. As a result, continuous efforts are made to find ways to improve mitochondrial health in the context of disuse and disease. While exercise is known to cause robust improvements in mitochondrial health, not all individuals are able to exercise. This creates a need for alternate interventions which elicit some of the same benefits as exercise. Passive heating (i.e., application of heat in the absence of muscle contractions) is one potential intervention which has been shown to increase mitochondrial enzyme content and activity, and to improve mitochondrial respiration. Associated with increases in mitochondrial content and/or function, passive heating can also improve insulin sensitivity in the context of type II diabetes and preserve muscle mass in the face of limb disuse. This area of research remains in its infancy, with many questions yet to be answered about how to maximize the benefits of passive heating and elucidate the mechanisms by which heat stress affects muscle mitochondria.
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Affiliation(s)
- Erik D Marchant
- Nutrition, Dietetics, and Food Science, Brigham Young University, Provo, UT, USA
| | | | | | | | - Chad R Hancock
- Nutrition, Dietetics, and Food Science, Brigham Young University, Provo, UT, USA
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Bouaichi CG, Odegaard KE, Neese C, Vincis R. Oral thermal processing in the gustatory cortex of awake mice. Chem Senses 2023; 48:bjad042. [PMID: 37850853 PMCID: PMC10630187 DOI: 10.1093/chemse/bjad042] [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: 07/27/2023] [Indexed: 10/19/2023] Open
Abstract
Oral temperature is a sensory cue relevant to food preference and nutrition. To understand how orally sourced thermal inputs are represented in the gustatory cortex (GC), we recorded neural responses from the GC of male and female mice presented with deionized water at different innocuous temperatures (14 °C, 25 °C, and 36 °C) and taste stimuli (room temperature). Our results demonstrate that GC neurons encode orally sourced thermal information in the absence of classical taste qualities at the single neuron and population levels, as confirmed through additional experiments comparing GC neuron responses to water and artificial saliva. Analysis of thermal-evoked responses showed broadly tuned neurons that responded to temperature in a mostly monotonic manner. Spatial location may play a minor role regarding thermosensory activity; aside from the most ventral GC, neurons reliably responded to and encoded thermal information across the dorso-ventral and antero-postero cortical axes. Additional analysis revealed that more than half of the GC neurons that encoded chemosensory taste stimuli also accurately discriminated thermal information, providing additional evidence of the GC's involvement in processing thermosensory information important for ingestive behaviors. In terms of convergence, we found that GC neurons encoding information about both taste and temperature were broadly tuned and carried more information than taste-selective-only neurons; both groups encoded similar information about the palatability of stimuli. Altogether, our data reveal new details of the cortical code for the mammalian oral thermosensory system in behaving mice and pave the way for future investigations on GC functions and operational principles with respect to thermogustation.
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Affiliation(s)
- Cecilia G Bouaichi
- Department of Biological Science and Programs in Neuroscience, Cell and Molecular Biology, and Biophysics, Florida State University, Tallahassee, FL, United States
| | - Katherine E Odegaard
- Department of Biological Science and Programs in Neuroscience, Cell and Molecular Biology, and Biophysics, Florida State University, Tallahassee, FL, United States
| | - Camden Neese
- Department of Biological Science and Programs in Neuroscience, Cell and Molecular Biology, and Biophysics, Florida State University, Tallahassee, FL, United States
| | - Roberto Vincis
- Department of Biological Science and Programs in Neuroscience, Molecular Biophysics and Cell and Molecular Biology, Florida State University, Tallahassee, FL, United States
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Yang Y, Pan G, Li X, Xu W, Chen N, Xie Q. Preparation and properties of environmentally benign waterborne polyurethane composites from sodium-alginate-modified nano calcium carbonate. Nanotechnology 2022; 34:095601. [PMID: 36541488 DOI: 10.1088/1361-6528/aca616] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Accepted: 11/25/2022] [Indexed: 06/17/2023]
Abstract
Well-dispersed inorganic nanoparticles in organic polymers are critical in the preparation of high-performance nanocomposites. This study prepared a series of waterborne polyurethane (WPU)/calcium carbonate nanocomposites using the solution blending method. Next, FT-IR, TG-DTG and XRD tests were carried out to confirm that the biopolymer sodium alginate (SA) was successfully encapsulated on the surface of the calcium carbonate nanoparticles, and that SA achieved satisfactory surface modification of the calcium carbonate nanoparticles. The Zeta and ultraviolet (UV) absorbance test results reveal that SA-modified nano calcium carbonate (MCC) had good dispersion stability in water. The effects of the MCC dosage on the composite mechanical properties, thermal stability, and cross-sectional morphology observed by scanning electron microscopy, and the water resistance of the nanocomposite were investigated. The results reveal that the incorporation of 3wt% of MCC in WPU had stable distribution, which led to a 54% increase in the tensile strength of the nanocomposite, while maintaining excellent elongation at break (2187%) and increasing the maximum decomposition temperature to 419.6 °C. Importantly, the improved water resistance facilitates the application of this environmentally benign composite material in humid environments.
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Affiliation(s)
- Yuhang Yang
- College of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, People's Republic of China
| | - Guanghua Pan
- College of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, People's Republic of China
| | - Xing Li
- College of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, People's Republic of China
| | - Wenqin Xu
- College of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, People's Republic of China
| | - Nanchun Chen
- College of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, People's Republic of China
| | - QingLin Xie
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, People's Republic of China
- Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541006, People's Republic of China
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36
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Foray G, Randrianalisoa JH, Adrien J, Maire E. X-ray Tomography Coupled with Finite Elements, A Fast Method to Design Aerogel Composites and Prove Their Superinsulation Experimentally. Gels 2022; 8:gels8110732. [PMID: 36354640 PMCID: PMC9689696 DOI: 10.3390/gels8110732] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 10/24/2022] [Accepted: 10/24/2022] [Indexed: 11/12/2022] Open
Abstract
Composite aerogels can include fibers, opacifiers and binders but are rarely designed and optimized to achieve the best thermal/mechanical efficiency. This paper proposes a three-dimensional X-ray tomography-based method for designing composites. Two types of models are considered: classical and inexpensive homogenization models and more refined finite element models. XrFE is based on the material’s real three-dimensional microstructure and/or its twin numerical microstructure, and calculates the effective conductivity of the material. First, the three-dimensional sample is meshed and labeled. Then, a finite element method is used to calculate the heat flow in the samples. The entire three-dimensional microstructure of a real or fictitious sample is thus associated with a heat flow and an effective conductivity. Parametric studies were performed to understand the relationship between microstructure and thermal efficiency. They highlighted how quickly a low volume fraction addition can improve or ruin thermal conductivity. A reduced set of three formulations was developed and fully characterized. The mechanical behavior was higher than 50 KPa, with thermal efficiencies ranging from 14 to 15 mW·m·K−1.
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Affiliation(s)
- Genevieve Foray
- Université de Lyon, INSA-Lyon, Université Claude Bernard Lyon 1, CNRS, MATEIS, UMR-5510, 69621 Villeurbanne, France
- Correspondence:
| | - Jaona Harifidy Randrianalisoa
- Institut de Thermique, Mécanique et Matériaux (ITheMM), Université de Reims Champagne-Ardenne, Campus Moulin de la Housse, CEDEX 2, 51687 Reims, France
| | - Jerome Adrien
- Université de Lyon, INSA-Lyon, Université Claude Bernard Lyon 1, CNRS, MATEIS, UMR-5510, 69621 Villeurbanne, France
| | - Eric Maire
- Université de Lyon, INSA-Lyon, Université Claude Bernard Lyon 1, CNRS, MATEIS, UMR-5510, 69621 Villeurbanne, France
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37
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Glowacz A. Thermographic Fault Diagnosis of Shaft of BLDC Motor. Sensors (Basel) 2022; 22:s22218537. [PMID: 36366235 PMCID: PMC9656265 DOI: 10.3390/s22218537] [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: 10/05/2022] [Revised: 10/22/2022] [Accepted: 11/02/2022] [Indexed: 05/25/2023]
Abstract
A technique of thermographic fault diagnosis of the shaft of a BLDC (Brushless Direct Current Electric) motor is presented in this article. The technique works for the shivering of the thermal imaging camera in the range of 0-1.5 [m/s2]. An electric shaver was used as the source of the BLDC motor. The following states of the BLDC motor were analyzed: Healthy BLDC motor (HB), BLDC motor with one faulty shaft (1FSB), BLDC motor with two faulty shafts (2FSB), and BLDC motor with three faulty shafts (3FSB). A new method of feature extraction named PNID (power of normalized image difference) was presented. Deep neural networks were used for the analysis of thermal images of the faulty shaft of the BLDC motor: GoogLeNet, ResNet50, and EfficientNet-b0. The results of the proposed technique were very good. PNID, GoogLeNet, ResNet50, and EfficientNet-b0 have an efficiency of recognition equal to 100% for four classes.
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Affiliation(s)
- Adam Glowacz
- Department of Automatic Control and Robotics, Faculty of Electrical Engineering, Automatics, Computer Science and Biomedical Engineering, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Kraków, Poland
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38
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Bao C, Mazumder SK. Reduced Collateral Tissue Damage Using Thermal-Feedback-Based Power Adaptation of an Electrosurgery Inverter. IEEE Trans Power Electron 2022; 37:11540-11545. [PMID: 35782315 PMCID: PMC9249024 DOI: 10.1109/tpel.2022.3179301] [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] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Well-selected power with accurate delivery is of importance in electrosurgery to generate proper temperature at the cutting site, and thus, reduce undesired collateral tissue damages. Conventional electrosurgery generator (ESG) targets tracking a preset power, manually set by surgeons per their experience before the surgery, with high accurate delivery. It is possible that this fixed power setting is not at the optimal point and, thus, increases the possibility of added-collateral biomedical tissue damage. To eliminate the potential negative impact of the fixed and ill-suited power setting, a real-time feedback control scheme is outlined in this article to adjust the preset power of the ESG to create an adaptive power reference, which is then tracked using an experimental high-frequency inverter (HFI) that enables electrosurgery with a fundamental (sinusoidal) output frequency of 390 kHz. Subsequently, experiments using the gallium nitride (GaN)-based HFI are carried out to demonstrate the efficacy of the new variable-power approach over the conventional fixed power approach in terms of collateral tissue damage reduction.
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Affiliation(s)
- Congbo Bao
- Electrical and Computer Engineering, University of Illinois at Chicago, Chicago, IL 60607 USA
| | - Sudip K Mazumder
- Electrical and Computer Engineering, University of Illinois at Chicago, Chicago, IL 60607 USA
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Kirk D, O’Connor MI, Mordecai EA. Scaling effects of temperature on parasitism from individuals to populations. J Anim Ecol 2022; 91:2087-2102. [PMID: 35900837 PMCID: PMC9532350 DOI: 10.1111/1365-2656.13786] [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: 04/29/2022] [Accepted: 07/15/2022] [Indexed: 11/27/2022]
Abstract
Parasitism is expected to change in a warmer future, but whether warming leads to substantial increases in parasitism remains unclear. Understanding how warming effects on parasitism in individual hosts (e.g. parasite load) translate to effects on population-level parasitism (e.g. prevalence, R0 ) remains a major knowledge gap. We conducted a literature review and identified 24 host-parasite systems that had information on the temperature dependence of parasitism at both individual host and host population levels: 13 vector-borne systems and 11 environmentally transmitted systems. We found a strong positive correlation between the thermal optima of individual- and population-level parasitism, although several of the environmentally transmitted systems exhibited thermal optima >5°C apart between individual and population levels. Parasitism thermal optima were close to vector performance thermal optima in vector-borne systems but not hosts in environmentally transmitted systems, suggesting these thermal mismatches may be more common in certain types of host-parasite systems. We also adapted and simulated simple models for both types of transmission modes and found the same pattern across the two modes: thermal optima were more strongly correlated across scales when there were more traits linking individual- to population-level processes. Generally, our results suggest that information on the temperature dependence, and specifically the thermal optimum, at either the individual or population level should provide a useful-although not quantitatively exact-baseline for predicting temperature dependence at the other level, especially in vector-borne parasite systems. Environmentally transmitted parasitism may operate by a different set of rules, in which temperature dependence is decoupled in some systems, requiring the need for trait-based studies of temperature dependence at individual and population levels.
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Affiliation(s)
- Devin Kirk
- Department of Biology, Stanford University, Stanford, USA
- Department of Zoology, University of British Columbia, Vancouver, Canada
| | - Mary I. O’Connor
- Department of Zoology, University of British Columbia, Vancouver, Canada
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Abuhussein M, Robinson A. Obscurant Segmentation in Long Wave Infrared Images Using GLCM Textures. J Imaging 2022; 8:266. [PMID: 36286360 DOI: 10.3390/jimaging8100266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 09/19/2022] [Accepted: 09/21/2022] [Indexed: 11/05/2022] Open
Abstract
The benefits of autonomous image segmentation are readily apparent in many applications and garners interest from stakeholders in many fields. The wide range of benefits encompass applications ranging from medical diagnosis, where the shape of the grouped pixels increases diagnosis accuracy, to autonomous vehicles where the grouping of pixels defines roadways, traffic signs, other vehicles, etc. It even proves beneficial in many phases of machine learning, where the resulting segmentation can be used as inputs to the network or as labels for training. The majority of the available image segmentation algorithmic development and results focus on visible image modalities. Therefore, in this treatment, the authors present the results of a study designed to identify and improve current semantic methods for infrared scene segmentation. Specifically, the goal is to propose a novel approach to provide tile-based segmentation of occlusion clouds in Long Wave Infrared images. This work complements the collection of well-known semantic segmentation algorithms applicable to thermal images but requires a vast dataset to provide accurate performance. We document performance in applications where the distinction between dust cloud tiles and clear tiles enables conditional processing. Therefore, the authors propose a Gray Level Co-Occurrence Matrix (GLCM) based method for infrared image segmentation. The main idea of our approach is that GLCM features are extracted from local tiles in the image and used to train a binary classifier to provide indication of tile occlusions. Our method introduces a new texture analysis scheme that is more suitable for image segmentation than the solitary Gabor segmentation or Markov Random Field (MRF) scheme. Our experimental results show that our algorithm performs well in terms of accuracy and a better inter-region homogeneity than the pixel-based infrared image segmentation algorithms.
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Rapisarda M, Meo M. Multifunctional Thermal, Acoustic, and Piezoresistive Properties of In Situ-Modified Composite Aerogels with Graphene Oxide as the Main Phase. ACS Appl Mater Interfaces 2022; 14:43646-43655. [PMID: 36121008 PMCID: PMC9523609 DOI: 10.1021/acsami.2c08042] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 09/07/2022] [Indexed: 06/15/2023]
Abstract
Automotive and aerospace industries require advanced materials capable of multifunctional abilities while guaranteeing limited weight and volume and simple processing. Cellular materials such as graphene-based aerogels represent a promising solution. In this study, chemical modification approaches of graphene oxide and polyvinyl alcohol (GOP) aerogels are presented. The combination of a plasticizing agent, glycerol, and a cross-linking agent, glutaraldehyde, is exploited to obtain a mechanically balanced and robust cellular structure. Modified GOP aerogels show high elastic resilience (energy loss coefficient of 29% and compressive strength of 5 kPa at 30% strain, after the 10th compression cycle), low thermal conductivity (0.0424 W mK-1), and high sound absorption (average coefficient of 0.72 between 500 and 1500 Hz) while maintaining a low density of 6.51 kg m-3 with a maximum thickness of 25 mm. Moreover, chemically reduced GOP (rGOP) aerogels are also synthesized. They are characterized by the additional feature of piezoresistive behavior, with only a marginal impact on the other properties. These results show that modified GOP and rGOP aerogels are promising candidates for the fabrication of multifunctional structures to be applied in advanced engineering applications.
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Behrmann O, Lisec T, Gojdka B. Towards Robust Thermal MEMS: Demonstration of a Novel Approach for Solid Thermal Isolation by Substrate-Level Integrated Porous Microstructures. Micromachines (Basel) 2022; 13:mi13081178. [PMID: 35893176 PMCID: PMC9332110 DOI: 10.3390/mi13081178] [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] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 07/19/2022] [Accepted: 07/21/2022] [Indexed: 01/27/2023]
Abstract
Most current thermal MEMS use fragile structures such as thin-film membranes or microcantilevers for thermal isolation. To increase the robustness of these devices, solid thermal insulators that are compatible with MEMS cleanroom processing are needed. This work introduces a novel approach for microscale thermal isolation using porous microstructures created with the recently developed PowderMEMS wafer-level process. MEMS devices consisting of heaters on a thin-film membrane were modified with porous microstructures made from three different materials. A thermal model for the estimation of the resulting thermal conductivity was developed, and measurements for porous structures in ambient air and under vacuum were performed. The PowderMEMS process was successfully used to create microscale thermal insulators in silicon cavities at the wafer level. Measurements indicate thermal conductivities of close to 0.1 W/mK in ambient air and close to 0.04 W/mK for porous structures under vacuum for the best-performing material. The obtained thermal conductivities are lower than those reported for both glass and porous silicon, making PowderMEMS a very interesting alternative for solid microscale thermal isolation.
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Li H, Wang Y, Fan K, Mao Y, Shen Y, Ding Z. Evaluation of important phenotypic parameters of tea plantations using multi-source remote sensing data. Front Plant Sci 2022; 13:898962. [PMID: 35937382 PMCID: PMC9355610 DOI: 10.3389/fpls.2022.898962] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Accepted: 06/28/2022] [Indexed: 06/15/2023]
Abstract
Tea height, leaf area index, canopy water content, leaf chlorophyll, and nitrogen concentrations are important phenotypic parameters to reflect the status of tea growth and guide the management of tea plantation. UAV multi-source remote sensing is an emerging technology, which can obtain more abundant multi-source information and enhance dynamic monitoring ability of crops. To monitor the phenotypic parameters of tea canopy more efficiently, we first deploy UAVs equipped with multispectral, thermal infrared, RGB, LiDAR, and tilt photography sensors to acquire phenotypic remote sensing data of tea canopy, and then, we utilize four machine learning algorithms to model the single-source and multi-source data, respectively. The results show that, on the one hand, using multi-source data sets to evaluate H, LAI, W, and LCC can greatly improve the accuracy and robustness of the model. LiDAR + TC data sets are suggested for assessing H, and the SVM model delivers the best estimation (Rp2 = 0.82 and RMSEP = 0.078). LiDAR + TC + MS data sets are suggested for LAI assessment, and the SVM model delivers the best estimation (Rp2 = 0.90 and RMSEP = 0.40). RGB + TM data sets are recommended for evaluating W, and the SVM model delivers the best estimation (Rp2 = 0.62 and RMSEP = 1.80). The MS +RGB data set is suggested for studying LCC, and the RF model offers the best estimation (Rp2 = 0.87 and RMSEP = 1.80). On the other hand, using single-source data sets to evaluate LNC can greatly improve the accuracy and robustness of the model. MS data set is suggested for assessing LNC, and the RF model delivers the best estimation (Rp2 = 0.65 and RMSEP = 0.85). The work revealed an effective technique for obtaining high-throughput tea crown phenotypic information and the best model for the joint analysis of diverse phenotypes, and it has significant importance as a guiding principle for the future use of artificial intelligence in the management of tea plantations.
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Affiliation(s)
- He Li
- Tea Research Institute, Qingdao Agricultural University, Qingdao, China
| | - Yu Wang
- Tea Research Institute, Qingdao Agricultural University, Qingdao, China
| | - Kai Fan
- Tea Research Institute, Qingdao Agricultural University, Qingdao, China
| | - Yilin Mao
- Tea Research Institute, Qingdao Agricultural University, Qingdao, China
| | - Yaozong Shen
- Tea Research Institute, Qingdao Agricultural University, Qingdao, China
| | - Zhaotang Ding
- Tea Research Institute, Qingdao Agricultural University, Qingdao, China
- Tea Research Institute, Shandong Academy of Agricultural Sciences, Jinan, China
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Azlin MNM, Sapuan SM, Zuhri MYM, Zainudin ES, Ilyas RA. Thermal Stability, Dynamic Mechanical Analysis and Flammability Properties of Woven Kenaf/Polyester-Reinforced Polylactic Acid Hybrid Laminated Composites. Polymers (Basel) 2022; 14:2690. [PMID: 35808734 PMCID: PMC9269322 DOI: 10.3390/polym14132690] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 06/17/2022] [Accepted: 06/21/2022] [Indexed: 02/01/2023] Open
Abstract
This paper presents the thermal and flammability properties of woven kenaf/polyester-reinforced polylactic acid hybrid laminated composites. The effects of the fiber content and stacking sequences of hybrid composites were examined. The hybrid composites were fabricated using the hot press method. Thermogravimetric analysis, differential scanning calorimetry, dynamic mechanical analysis, and flammability properties of woven kenaf/polyester-reinforced polylactic hybrid composites were reported. The thermal results have demonstrated the effect of the hybridization of the composites on the thermal stability and viscoelastic properties of the laminates. The work also measured the burning rate of the hybrid composites during the flammability test. The S7 sample that consisted of all woven kenaf layers in composite recorded the highest char residue of 10%, and the S8 sample displayed the highest decomposition temperature among all samples. However, as for hybrid composites, the S5 sample shows the optimum result with a high char yield and exhibited the lowest burning rate at 29 mm/min. The S5 sample also shows the optimum viscoelastic properties such as storage and loss modulus among hybrid composites.
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Affiliation(s)
- M. N. M. Azlin
- Laboratory of Biocomposite Technology, Institute of Tropical Forestry and Forest Products, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia; (M.N.M.A.); (M.Y.M.Z.); (E.S.Z.)
- School of Industrial Technology, Department of Textile Technology, Universiti Teknologi MARA, Cawangan Negeri Sembilan, Kampus Kuala Pilah, Kuala Pilah 72000, Negeri Sembilan, Malaysia
| | - S. M. Sapuan
- Advanced Engineering Materials and Composites Research Centre, Department of Mechanical and Manufacturing Engineering, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
| | - M. Y. M. Zuhri
- Laboratory of Biocomposite Technology, Institute of Tropical Forestry and Forest Products, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia; (M.N.M.A.); (M.Y.M.Z.); (E.S.Z.)
- Advanced Engineering Materials and Composites Research Centre, Department of Mechanical and Manufacturing Engineering, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
| | - E. S. Zainudin
- Laboratory of Biocomposite Technology, Institute of Tropical Forestry and Forest Products, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia; (M.N.M.A.); (M.Y.M.Z.); (E.S.Z.)
- Advanced Engineering Materials and Composites Research Centre, Department of Mechanical and Manufacturing Engineering, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
| | - R. A. Ilyas
- School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor Bahru 81310, Johor, Malaysia;
- Centre for Advanced Composite Materials (CACM), Faculty of Engineering, Universiti Teknologi Malaysia, Johor Bahru 81310, Johor, Malaysia
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Soni A, Brightwell G. Effect of Hurdle Approaches Using Conventional and Moderate Thermal Processing Technologies for Microbial Inactivation in Fruit and Vegetable Products. Foods 2022; 11:1811. [PMID: 35742009 DOI: 10.3390/foods11121811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 06/13/2022] [Accepted: 06/16/2022] [Indexed: 12/04/2022] Open
Abstract
Thermal processing of packaged fruit and vegetable products is targeted at eliminating microbial contaminants (related to spoilage or pathogenicity) and extending shelf life using microbial inactivation or/and by reducing enzymatic activity in the food. The conventional process of thermal processing involves sterilization (canning and retorting) and pasteurization. The parameters used to design the thermal processing regime depend on the time (minutes) required to eliminate a known population of bacteria in a given food matrix under specified conditions. However, due to the effect of thermal exposure on the sensitive nutrients such as vitamins or bioactive compounds present in fruits and vegetables, alternative technologies and their combinations are required to minimize nutrient loss. The novel moderate thermal regimes aim to eliminate bacterial contaminants while retaining nutritional quality. This review focuses on the “thermal” processing regimes for fruit and vegetable products, including conventional sterilization and pasteurization as well as mild to moderate thermal techniques such as pressure-assisted thermal sterilization (PATS), microwave-assisted thermal sterilization (MATS) and pulsed electric field (PEF) in combination with thermal treatment as a hurdle approach or a combined regime.
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Khryshchanovich VY, Shestak NG, Skobeleva NY. [Truncal mechanochemical versus thermal endovenous ablation for varicose vein disease: a systematic review and meta-analysis]. Khirurgiia (Mosk) 2022:116-126. [PMID: 35658143 DOI: 10.17116/hirurgia2022061116] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVE To compare the outcomes of thermal and mechanochemical endovenous ablative techniques in patients with varicose veins. MATERIAL AND METHODS We searched the PubMed, EMBASE and Cochrane Library databases for studies devoted to mechanochemical and thermal endovenous ablative techniques from inception until July 2021. The primary outcome was anatomical success. Secondary endpoints were intraoperative pain syndrome, complications, modification of disease severity and quality of life. RESULTS This meta-analysis enrolled 10 comparative studies and 1.252 participants after truncal ablations. The follow-up period ranged from 4 weeks to 36 months. With regard to overall anatomical success, 245 out of 267 (91.8%) patients after mechanochemical ablation and 249 out of 266 (93.6%) patients after thermal ablation had favorable results after a month (low-quality evidence; odds ratio [OR] 0.79; 95% CI 0.40-1.55). No statistical heterogeneity was identified (χ2=1.48; df=2; p=0.48; I2=0%). Further analysis identified different incidence of total occlusion after 12 months or later (OR 0.36; 95% CI 0.11-1.21; p=0.05; I2=68%). Mechanochemical ablation resulted less intraoperative pain. Mean difference was -1.3 (95% CI -2.53- -0.07; p=0.00001). MOCA was followed by fewer incidence of nerve injury, hematoma, deep vein thrombosis and phlebitis. There were more cases of skin pigmentation compared to thermal ablation (low-quality evidence, p>0.05). Subsequent assessment of disease severity identified significant between-group difference of means (-0.64 (95% CI -1.82-0.53; p=0.004) and -0.16 (95% CI -0.43-0.11; p=0.005) after 6 and 12 months, respectively). Further assessment of quality of life revealed no between-group differences. These data were characterized by moderate methodological quality. CONCLUSION Mechanochemical ablation is as effective as standard TA within the first postoperative month. However, this approach is associated with lesser anatomical success after 12 months. In most studies, pain syndrome was less severe in case of mechanochemical ablation. These data suggest that mechanochemical ablation is a safe alternative for varicose veins. However, further large-scale trials are required to define the role of MOCA.
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Affiliation(s)
| | - N G Shestak
- Belarussian State Medical University, Minsk, Republic of Belarus.,Savchenko Minsk City Clinical Hospital No. 4, Minsk, Republic of Belarus
| | - N Ya Skobeleva
- Belarussian State Medical University, Minsk, Republic of Belarus.,Clinical Maternity Hospital of Minsk Region, Minsk, Republic of Belarus
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Abujabal M, Abunahla H, Mohammad B, Alazzam A. Tunable Switching Behavior of GO-Based Memristors Using Thermal Reduction. Nanomaterials (Basel) 2022; 12:nano12111812. [PMID: 35683668 PMCID: PMC9182041 DOI: 10.3390/nano12111812] [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] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 05/20/2022] [Accepted: 05/23/2022] [Indexed: 11/17/2022]
Abstract
This work reports on the fabrication of a novel planar reduced graphene oxide (rGO) memristor (MR) device. For the first time in the literature, the MR tunable resistive switching behavior is controlled by the GO reduction time at a constant temperature. The device is fabricated using standard microfabrication techniques on a flexible cyclic olefin copolymer substrate (COC). Thermal reduction of the GO layer at low temperatures (100 °C) avoids the drawbacks of chemical reduction methods such as toxicity and electrode metal damage during fabrication, while allowing for fine-tuning of the MR’s switching behavior. The device has analog switching characteristics, with a range of different resistance states. By taking advantage of the slow nature of GO thermal annealing, the switching properties of the rGO memristors can be precisely controlled by adjusting the reduction period. At short annealing times (i.e., T < 20 h), the devices switch from high to low resistance states, while at longer annealing times the switching behavior is reversed, with the device switching from low to high resistance states (LRS to HRS). Resistive switching occurs as a result of the diffusion and removal of the oxygen functional groups in the GO film caused by Joule heating induced by the electric current. Complete electrical characterization tests are presented along with wettability and X-ray diffraction (XRD) tests. This work opens a new vision for realizing rGO-based MR devices with tunable switching properties, broadening the application horizon of the device.
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Affiliation(s)
- Muayad Abujabal
- System on Chip Lab, Department of Mechanical Engineering, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates;
| | - Heba Abunahla
- System on Chip Lab, Department of Electrical Engineering and Computer Science, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates; (H.A.); (B.M.)
| | - Baker Mohammad
- System on Chip Lab, Department of Electrical Engineering and Computer Science, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates; (H.A.); (B.M.)
| | - Anas Alazzam
- System on Chip Lab, Department of Mechanical Engineering, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates;
- Correspondence:
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Roy A, Ullah H, Alzahrani M, Ghosh A, Mallick TK, Tahir AA. Synergistic Effect of Paraffin-Incorporated In 2O 3/ZnO Multifold Smart Glazing Composite for the Self-Cleaning and Energy-Saving Built Environment. ACS Sustain Chem Eng 2022; 10:6609-6621. [PMID: 35634267 PMCID: PMC9131515 DOI: 10.1021/acssuschemeng.2c00260] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 04/26/2022] [Indexed: 05/06/2023]
Abstract
The thermal performance of window glazing requires improvement for a sustainable built environment at an acceptable cost. The current work demonstrates a multifold smart composite consisting of an optimized In2O3/ZnO-polymethyl methacrylate-paraffin composite to reduce heat exchange through the combined self-cleaning and energy-saving envelope of the smart built environment. This work has attempted to develop a smart composite coating that combines photosensitive metal oxide and phase change materials and investigate their thermal comfort performance as a glazed window. It is observed that the In2O3/ZnO (5 wt %) multifold composite film experienced better transmittance and thermal performance compared to its other wt % composite samples. Moreover, the multifold composite-coated glass integrated into a prototype glazed window was further investigated for its thermal performance, where a steady average indoor temperature of ∼30 °C was achieved when the outside temperature reached ∼55 °C, while maintaining good visibility. Interestingly, the transparency reached ∼86% at 60 °C and exhibited a hydrophobic water contact angle (WCA) of ∼138°. In contrast, a similar film exhibits ∼64% transparency at 22 °C, where the WCA becomes moderately hydrophilic (∼68°). Temperature dependency on transparency and wettability properties was examined for up to 60 cycles, resulting in excellent indoor thermal comfort. In addition, a thermal simulation study was executed for the smart multifold glazing composite. Moreover, this study offers dynamic glazing development options for energy saving in the smart built environment.
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Affiliation(s)
- Anurag Roy
- Environment
and Sustainability Institute, University
of Exeter, Penryn Campus, Cornwall TR10 9FE, U.K.
- ;
| | - Habib Ullah
- Environment
and Sustainability Institute, University
of Exeter, Penryn Campus, Cornwall TR10 9FE, U.K.
| | - Mussad Alzahrani
- Environment
and Sustainability Institute, University
of Exeter, Penryn Campus, Cornwall TR10 9FE, U.K.
- Mechanical
and Energy Engineering Department, Imam
Abdulrahman Bin Faisal University, Dammam 34212, Saudi Arabia
| | - Aritra Ghosh
- College
of Engineering, Mathematics and Physical Sciences, Renewable Energy, University of Exeter,
Penryn, Cornwall TR10 9FE, U.K.
| | - Tapas K. Mallick
- Environment
and Sustainability Institute, University
of Exeter, Penryn Campus, Cornwall TR10 9FE, U.K.
| | - Asif Ali Tahir
- Environment
and Sustainability Institute, University
of Exeter, Penryn Campus, Cornwall TR10 9FE, U.K.
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Pais-Vieira C, Gaspar P, Matos D, Alves LP, da Cruz BM, Azevedo MJ, Gago M, Poleri T, Perrotta A, Pais-Vieira M. Embodiment Comfort Levels During Motor Imagery Training Combined With Immersive Virtual Reality in a Spinal Cord Injury Patient. Front Hum Neurosci 2022; 16:909112. [PMID: 35669203 PMCID: PMC9163805 DOI: 10.3389/fnhum.2022.909112] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 04/28/2022] [Indexed: 02/02/2023] Open
Abstract
Brain-machine interfaces combining visual, auditory, and tactile feedback have been previously used to generate embodiment experiences during spinal cord injury (SCI) rehabilitation. It is not known if adding temperature to these modalities can result in discomfort with embodiment experiences. Here, comfort levels with the embodiment experiences were investigated in an intervention that required a chronic pain SCI patient to generate lower limb motor imagery commands in an immersive environment combining visual (virtual reality -VR), auditory, tactile, and thermal feedback. Assessments were made pre-/ post-, throughout the intervention (Weeks 0-5), and at 7 weeks follow up. Overall, high levels of embodiment in the adapted three-domain scale of embodiment were found throughout the sessions. No significant adverse effects of VR were reported. Although sessions induced only a modest reduction in pain levels, an overall reduction occurred in all pain scales (Faces, Intensity, and Verbal) at follow up. A high degree of comfort in the comfort scale for the thermal-tactile sleeve, in both the thermal and tactile feedback components of the sleeve was reported. This study supports the feasibility of combining multimodal stimulation involving visual (VR), auditory, tactile, and thermal feedback to generate embodiment experiences in neurorehabilitation programs.
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Affiliation(s)
- Carla Pais-Vieira
- Centro de Investigação Interdisciplinar em Saúde (CIIS), Instituto de Ciências da Saúde (ICS), Universidade Católica Portuguesa, Porto, Portugal
| | - Pedro Gaspar
- Centro de Investigação em Ciência e Tecnologia das Artes (CITAR), Universidade Católica Portuguesa, Porto, Portugal
| | - Demétrio Matos
- ID+ (Instituto de Investigação em Design, Média e Cultura), Instituto Politécnico do Cávado e do Ave, Vila Frescainha, Portugal
| | - Leonor Palminha Alves
- Human Robotics Group, Centro de Sistemas Inteligentes do IDMEC - Instituto de Engenharia Mecânica, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
| | - Bárbara Moreira da Cruz
- Serviço de Medicina Física e Reabilitação, Hospital Senhora da Oliveira, Guimarães, Portugal
| | - Maria João Azevedo
- Serviço de Medicina Física e Reabilitação, Hospital Senhora da Oliveira, Guimarães, Portugal
| | - Miguel Gago
- Serviço de Neurologia, Hospital Senhora da Oliveira, Guimarães, Portugal
| | - Tânia Poleri
- Plano de Ação para Apoio aos Deficientes Militares, Porto, Portugal
| | - André Perrotta
- Centre for Informatics and Systems of the University of Coimbra (CISUC), Coimbra, Portugal
| | - Miguel Pais-Vieira
- Institute of Biomedicine (iBiMED), Department of Medical Sciences, Universidade de Aveiro, Aveiro, Portugal
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Nikolov A, Karamanov A. Thermal Properties of Geopolymer Based on Fayalite Waste from Copper Production and Metakaolin. Materials (Basel) 2022; 15:2666. [PMID: 35407998 DOI: 10.3390/ma15072666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 03/30/2022] [Accepted: 04/01/2022] [Indexed: 02/05/2023]
Abstract
In the present study, thermal properties of geopolymer paste, based on fayalite waste from copper producing plants and metakaolin, were analyzed. The used activator solution was a mixture of sodium water glass, potassium hydroxide and water with the following molar ratio: SiO2/M2O = 1.08, H2O/M2O = 15.0 and K2O/Na2O = 1.75. High strength geopolymers pastes were evaluated after exposure to 400, 800 and 1150 °C. The physical properties (absolute and apparent density, water absorption) and compressive strength were determined on the initial and the heat treated samples. The phase composition, microstructure and spectroscopic characteristics were examined by XRD, SEM-EDS, FTIR and Mössbauer spectroscopy, respectively. The structure of the heat-treated geopolymers differs in the outer and inner layers of the specimens due to variation in the phase composition. The outer layer was characterized by a reddish color and more rigidity, while the inner core was black and less viscous at elevated temperatures. The results showed that geopolymer pastes based on fayalite are fire-resistant up to 1150 °C. Moreover, after heat treatment at this temperature, the compressive strength increased by 75% to 139 MPa, while water absorption reduced by about 9 times to 1.2%. These improvements are explained with the crystallization of the geopolymer gel to leucite and K,Na-sanidine, and substitutions of Al/Fe in the geopolymer gel and iron phases.
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