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Srinivasan K, Sakthivel S. Classic anterior lenticonus in Alport syndrome. J Fr Ophtalmol 2024; 47:104120. [PMID: 38447292 DOI: 10.1016/j.jfo.2024.104120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 09/04/2023] [Accepted: 10/08/2023] [Indexed: 03/08/2024]
Affiliation(s)
- K Srinivasan
- Department of Glaucoma, Aravind Eye Hospital,Thavalakuppam, 605007 Puducherry, India.
| | - S Sakthivel
- Department of Glaucoma, Aravind Eye Hospital,Thavalakuppam, 605007 Puducherry, India
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Fonzin Fozin T, Tchamda AR, Sivaganesh G, Srinivasan K, Tabekoueng Njitacke Z, Mezatio AB. Superconductivity coupling of harmonic resonant oscillators: Homogeneous and heterogeneous extreme multistability with multi-scrolls. Chaos 2024; 34:013148. [PMID: 38285725 DOI: 10.1063/5.0176928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Accepted: 12/27/2023] [Indexed: 01/31/2024]
Abstract
Understanding and characterizing multistabilities, whether homogeneous or heterogeneous, is crucial in various fields as it helps to unveil complex system behaviors and provides insights into the resilience and adaptability of these systems when faced with perturbations or changes. Homogeneous and heterogeneous multistabilities refer, respectively, to situation in which various multiple stable states within a system are qualitatively similar or distinct. Generating such complex phenomena with multi-scrolls from inherent circuits is less reported. This paper aims to investigate extreme multistability dynamics with homogeneous and heterogeneous multi-scrolls in two coupled resonant oscillators through a shunted Josephson junction. Analysis of equilibrium points revealed that the system supports both hidden and self-excited attractors. Various dynamical tools, including bifurcation diagrams, spectrum of Lyapunov exponents, and phase portraits, are exploited to establish the connection between the system parameters and various complicated dynamical features of the system. By tuning both system parameters and initial conditions, some striking phenomena, such as homogeneous and heterogeneous extreme multistability, along with the emergence of multi-scrolls, are illustrated. Furthermore, it is observed that one can readily control the number of scrolls purely by varying the initial conditions of the investigated system. A multi-metastable phenomenon is also captured in the system and confirmed using the finite-time Lyapunov exponents. Finally, the microcontroller implementation of the system demonstrates strong alignment with the numerical investigations.
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Affiliation(s)
- T Fonzin Fozin
- Department of Electrical and Electronic Engineering, Faculty of Engineering and Technology (FET), University of Buea, P.O. Box 63, Buea, Cameroon
| | - A R Tchamda
- Department of Rural Engineering, Faculty of Agronomy and Agricultural Sciences, University of Dschang, P.O. Box 222, Dschang, Cameroon
| | - G Sivaganesh
- Department of Physics, Alagappa Chettiar Government College of Engineering and Technology, Karaikudi 630003, Tamilnadu, India
| | - K Srinivasan
- Department of Physics, Nehru Memorial College (Affiliated to Bharathidasan University, Tiruchirapalli 620024, Tamilnadu, India), Puthanampatti, Tiruchirapalli 621007, Tamilnadu, India
| | - Z Tabekoueng Njitacke
- Department of Electrical and Electronic Engineering, College of Technology (COT), University of Buea, P.O. Box 63, Buea, Cameroon
| | - A B Mezatio
- South-Polytech (Affiliated to École National Supérieur Polytechnique de Douala, Université de Douala, Douala, Cameroun), Institut Universitaire des Grandes Écoles des Tropiques, P.O. Box 25080, Douala, Cameroun
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Pegu I, Srinivasan K, Tejaswini U. Sparkling anterior chamber. J Fr Ophtalmol 2023; 46:1269-1270. [PMID: 37620190 DOI: 10.1016/j.jfo.2023.05.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 05/28/2023] [Indexed: 08/26/2023]
Affiliation(s)
- I Pegu
- Department of Glaucoma, Aravind Eye Hospital, Cuddalore Main Rd, Thavalakuppam, Puducherry, Pondicherry, India
| | - K Srinivasan
- Department of Glaucoma, Aravind Eye Hospital, Cuddalore Main Rd, Thavalakuppam, Puducherry, Pondicherry, India.
| | - U Tejaswini
- Department of Glaucoma, Aravind Eye Hospital, Cuddalore Main Rd, Thavalakuppam, Puducherry, Pondicherry, India
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Sivaganesh G, Srinivasan K, Fonzin Fozin T, Gladwin Pradeep R. Boosting of stable synchronization in coupled non-identical counter-rotating chaotic systems. Chaos 2023; 33:093116. [PMID: 37703475 DOI: 10.1063/5.0165063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Accepted: 08/21/2023] [Indexed: 09/15/2023]
Abstract
Achieving synchronization in coupled non-identical chaotic systems has been a difficult endeavor, and improving the stability of synchronization in such systems poses additional challenges. This research work addresses these challenges by identifying stable synchronization in coupled non-identical chaotic systems and enhancing its stability. The study explores chaotic attractors that arise from various system parameters to provide generalized results. Furthermore, the impact of the transient uncoupling factor on improving synchronization stability in coupled non-identical counter-rotating chaotic oscillators is discussed. By investigating these aspects, the research aims to contribute to the understanding and advancement of synchronization in coupled non-identical chaotic systems.
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Affiliation(s)
- G Sivaganesh
- Department of Physics, Alagappa Chettiar Government College of Engineering and Technology, Karaikudi, Tamilnadu 630 003, India
| | - K Srinivasan
- Bharathidasan University, Tiruchirapalli, Tamilnadu 620 024, India
- Department of Electrical and Electronic Engineering, Faculty of Engineering and Technology (FET), University of Buea, P.O. Box 63, Buea, Cameroon
| | - T Fonzin Fozin
- Department of Electrical and Electronic Engineering, Faculty of Engineering and Technology (FET), University of Buea, P.O. Box 63, Buea, Cameroon
| | - R Gladwin Pradeep
- Department of Physics, KCG College of Technology, Chennai 600 097, India
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Chaitanya SK, Sriraman S, Srinivasan S, Srinivasan K. Machine learning aided near-field acoustic holography based on equivalent source method. J Acoust Soc Am 2023; 153:940. [PMID: 36859159 DOI: 10.1121/10.0017115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Accepted: 01/16/2023] [Indexed: 06/18/2023]
Abstract
In recent times, equivalent source method-based near-field acoustic holography methods have been extensively applied in sound source localization and characterization. The most commonly used equivalent sources are spherical harmonics. In a non-reverberant environment with no reflections, these equivalent sources could be the best choice since spherical harmonics are derived for the Sommerfeld boundary condition. However, these methods are not the best fit for reverberating environments. In such cases, a new relationship can be calculated between the field weights and the measured pressure with enough training examples. The proposed machine learning models include linear regression (LR) with adaptive moment estimation (Adam), LR with limited-memory Broyden-Fletcher-Goldfarb-Shanno (L-BFGS), and multi-layer perceptron with one and two hidden layers. These methods are tested for multiple monopoles and vibrating plate simulations in a room with different wall absorption coefficients. The data-driven methods are also studied on loudspeakers numerically and experimentally in a free field environment. The results from these methods are compared with the results of one norm convex optimization (L1CVX). LR with L-BFGS performed the best among all the methods studied and performed better than L1CVX for less absorption coefficient for geometrically separable sources. LR with L-BFGS also has much faster inference times.
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Affiliation(s)
- S K Chaitanya
- Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, India
| | - Siddharth Sriraman
- Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, Chennai, India
| | - Srinath Srinivasan
- Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, Chennai, India
| | - K Srinivasan
- Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, India
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Srinivasan K, Sudarsan JS, Nithiyanantham S. Assessment of carbon nanotube’s bulk density property for improving flexural aspects of reinforcement steel-less concrete in construction projects-II. Appl Nanosci 2023. [DOI: 10.1007/s13204-023-02760-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Dharani S, Kalaiarasi G, Lynch VM, Srinivasan K, Prabhakaran R. Correction: C–H activation and subsequent C–C bond formation in rigid alkenes catalyzed by Ru( iii) metallates. REACT CHEM ENG 2023. [DOI: 10.1039/d3re90004e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Correction for ‘C–H activation and subsequent C–C bond formation in rigid alkenes catalyzed by Ru(iii) metallates’ by S. Dharani et al., React. Chem. Eng., 2023, 8, 164–174, https://doi.org/10.1039/D2RE00317A.
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Affiliation(s)
- S. Dharani
- Department of Chemistry, Bharathiar University, Coimbatore 641046, India
| | - G. Kalaiarasi
- Department of Chemistry, Bharathiar University, Coimbatore 641046, India
| | - Vincent M. Lynch
- Department of Chemistry, University of Texas, Austin, TX 78712-1224, USA
| | - K. Srinivasan
- Department of Physics, Bharathiar University, Coimbatore 641046, India
| | - R. Prabhakaran
- Department of Chemistry, Bharathiar University, Coimbatore 641046, India
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Saranya N, Srinivasan K, Pravin Kumar S. FBCNN-TSA: An optimal deep learning model for banana ripening stages classification. IFS 2022. [DOI: 10.3233/jifs-221841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Ripeness of the fruit is significant in agriculture since it affects the fruit’s quality and sales. Manually determining the fruit’s ripeness has various drawbacks, including the fact that it consumes time, needs a lot of work, and occasionally results in errors. One of the crucial areas of the economies of nations is the agricultural sector. However, the manual approach is still occasionally used to assess the maturity of fruit. Fruit ripeness could be automatically categorized by the advancement of computer vision and machine learning technology. The Convolutional Neural Network (CNN) is used in this work is to classify the different ripeness stages of banana fruit. The four stages of banana ripeness are unripe, mid-ripe, ripe, and overripe. Proposed method uses a fuzzy-based convolutional neural network with tunicate swarm algorithm. The proposed model outperforms cutting-edge computer vision-based algorithms in both coarse and perfectly acceptable classification of maturation phases. The experimental results using images of bananas at various stages of ripening, achieves overall accuracy of 96.9%.
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Affiliation(s)
- N. Saranya
- Department of Information Technology, Sri Ramakrishna Engineering College, Coimbatore
| | - K. Srinivasan
- Department of Electronics and Instrumentation Engineering, Sri Ramakrishna Engineering College, Coimbatore
| | - S.K. Pravin Kumar
- Department of Electronics and Communication Engineering, United Institute of Technology, Coimbatore
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Kelly G, Iordanov R, Franklin A, Ahmed A, Srinivasan K, Hayon J, Lasco TM, Amini R, Shay S, Kulkarni PA, Mohajer MA. 185. Implementation of Multiplex Polymerase Chain Reaction in Clinical Practice: Impact on Antimicrobial Management In Infectious Diarrhea. Open Forum Infect Dis 2022. [PMCID: PMC9751986 DOI: 10.1093/ofid/ofac492.263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Background Stool culture and stool polymerase chain reaction (PCR) panels are both used to evaluate patients with suspected infectious diarrhea. Stool PCR panels are especially advantageous because of their ability to detect a broad array of infectious pathogens in less than one hour. Our study assessed how the use of stool PCR panels instead of stool culture impacted antibiotic days of therapy (DOT) and length of therapy (LOT) in hospitalized patients with suspected infectious diarrhea. Methods In December 2021, an intervention was implemented in our hospital in which all electronic orders for stool cultures were automatically switched to stool PCR testing. The pre-intervention group was comprised of 75 hospitalized adult patients who had a stool culture obtained from September to November 2021. The post-intervention group was comprised of 81 adult patients who had a stool PCR obtained from December 2021 to February 2022. The DOT and LOT for antibiotics prescribed specifically for infectious diarrhea were determined for each patient; DOT and LOT were compared between the pre- and post- intervention groups. Results The median DOT in the pre- and post-intervention groups was 0 with a range of 0-10 and 0-8, respectively. The median LOT in the pre- and post-intervention groups was 0 (range 0-5 for both groups). No significant difference in the median DOT (Wilcoxon rank sum test, p-value = 0.967) or LOT (Wilcoxon rank sum test, p-value = 0.993) was found between the pre- and post-intervention groups (Figure 1). After adjusting for patient days present, no significant change in DOT or LOT incidence rate was found between the pre- and post-intervention groups. The DOT incidence rate ratio (RR) was 0.71 (95% CI 0.42, 1.22), and the LOT incidence RR was 0.67 (95% CI 0.36, 1.24).
DOT and LOT Comparisons between Pre- and Post-Intervention Groups ![]() Antibiotic days of therapy (DOT) stratified by study period (top) and antibiotic (LOT) stratified by study period (bottom). Conclusion An intervention of automatically changing stool culture testing to stool PCR testing did not result in a significant change in median DOT or LOT in hospitalized adult patients, nor did it result in a significant change in DOT or LOT incidence rate. These findings could be explained by an insufficient sample size (n = 156), limiting the study’s power. Additionally, most patients in the pre-intervention group received no antibiotics for infectious diarrhea, resulting in a short DOT and LOT at baseline. Disclosures Sabra Shay, BSN, MPH, Premier Inc.: Employee Prathit A. Kulkarni, M.D., Vessel Health, Inc.: Grant/Research Support.
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Affiliation(s)
- Gillean Kelly
- Baylor College of Medicine / The University of Texas Health Science Center at Houston School of Public Health, Houston, Texas
| | | | | | - Amna Ahmed
- Baylor College of Medicine, Houston, Texas
| | | | | | - Todd M Lasco
- Baylor St. Luke's Medical Center, Houston, Texas
| | - Rosie Amini
- Premier Healthcare Inc., Seattle, Washington
| | | | - Prathit A Kulkarni
- Michael E. DeBakey VA Medical Center / Baylor College of Medicine, Houston, Texas
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Aramburo OM, Spallone A, Khawaja F, Sassine J, Srinivasan K, Febres-Aldana AJ, Shigle TL, Rondon G, Ramdial J, Shpall E, Ariza-Heredia E, Chemaly RF. 2121. The Impact of Donor CMV Serostatus on Outcomes of CMV Infections in the Era of Letermovir. Open Forum Infect Dis 2022. [PMCID: PMC9752550 DOI: 10.1093/ofid/ofac492.1742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Background Cytomegalovirus (CMV) infection is a frequent complication after allogeneic hematopoietic cell transplant (allo-HCT) and may increase the risk of other viral infections through its immunomodulatory effects. Donor CMV serology (seropositive [D+] or seronegative donor [D-]) in CMV-seropositive (R+) or seronegative recipients (R-) may impact outcomes post allo-HCT. We analyzed the significance of donor CMV serostatus in a large cohort of alloHCT recipients. Methods This is a single-center, retrospective cohort study of 651 allo-HCT recipients cared for at our institution between March 2016 and December 2018. Data on baseline demographics, transplant characteristics, preventive strategies, CMV infection characteristics, and transplant-related outcomes (development of graft versus host disease (GVHD), all-cause mortality, and non-relapse mortality) were collected. A univariate analysis was performed for outcomes of interest using CMV serostatus D-/R- as a control group. Results Out of the 651 allo-HCT recipients, 77 were D-/R-, 43 D+/R-, 290 D+/R+, and 241 D-/R+ (table 1). Most patients underwent HCT for AML (40%), received myeloablative conditioning (51%), and had a matched unrelated donor (MUD) HCT (46%). In 2018, letermovir was used in 27% of the D+/R+, 18% of the D-/R+ allo-HCT recipients (table 1) for a total of 116 (55%) allo-HCT recipients. Compared to the CMV D-/R- group, D+/R+ and D-/R+ groups (table 2) had a greater incidence of clinically signicant CMV infections (CS-CMVi) (3.9% vs. 40% vs. 50.6%; all p< 0.01, respectively), CMV end organ disease (0% vs. 14.8% vs. 19.1%; all p< 0.001, respectively), and refractory/resistant (R/R) CMV infections (0% vs. 5.5% vs. 12.4%; all p< 0.03, respectively) with 48 weeks of allo-HCT. CS-CMVi and R/R CMV was more common in D-/R+ allo-HCT when compared to D+/R+ group (50.6% vs. 40.0%, p< 0.001). D-/R+ allo-HCT had worse non-relapse mortality at day 100 compared to D-/R- (3.9% vs. 10.8%, p=0.07).
Baseline characteristics ![]() Outcome analysis ![]() Conclusion Allo-HCT recipients with CMV seronegative donor and recipient had less CMV related complications and a trend towards better survival when compared to D-/R+ allo-HCT. CMV D-/R+ HCT recipients had greater CMV related complications when compared to CMV D+/R+ HCT recipients, possibly due to the protective affect of donor seropositivity. Disclosures Terri Lynn Shigle, PharmD, BCOP, Takeda: Advisor/Consultant Gabriella Rondon, MD, Omeros: Advisor/Consultant Elizabeth Shpall, MD, Adaptimmune: Advisor/Consultant|Affimed: License agreement|Axio: Advisor/Consultant|Bayer Helathcare Pharmaceuticals: Honoraria|Fibroblasts and FibrioBiologics: Advisor/Consultant|Navan: Advisor/Consultant|NY Blood Center: Advisor/Consultant|Takeda: License agreement Ella Ariza-Heredia, MD, MERCK: Grant/Research Support Roy F. Chemaly, MD/MPH, Karius: Advisor/Consultant|Karius: Grant/Research Support.
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Affiliation(s)
| | - Amy Spallone
- University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Fareed Khawaja
- The University of Texas MD Anderson Cancer Center, houston, Texas
| | - Joseph Sassine
- University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
| | | | | | | | - Gabriella Rondon
- The University of Texas MD Anderson Cancer Center, houston, Texas
| | - Jeremy Ramdial
- University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Elizabeth Shpall
- The University of Texas MD Anderson Cancer Center, houston, Texas
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Chiradoni Thungappa S, Taran R, Singh J, Shrivastav S, Vithalani N, Mukherjee K, Nagarkar R, Maksud T, Mehta A, Srinivasan K, Vikranth M, Sonawane S, Ahmad A, Sheikh S, Ali S, Paithankar M, Rajani A, Bunger D, Khan M, Ahmad I. 246P Nanosomal paclitaxel lipid suspension demonstrates better tumor response and safety versus conventional paclitaxel in patients with metastatic breast cancer. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.07.285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Senthil T, Parkavi R, Senthil Kumar P, Chandramohan A, Rangasamy G, Srinivasan K, Dinakaran K. PbS/graphene hybrid nanostructures coated glassy carbon electrode for the electrochemical sensing of copper ions in aqueous solution. Food Chem Toxicol 2022; 168:113375. [PMID: 35995075 DOI: 10.1016/j.fct.2022.113375] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 08/08/2022] [Accepted: 08/11/2022] [Indexed: 01/21/2023]
Abstract
In this research, we have studied the electrochemical sensing of Cu(II) ions in aqueous solution using PbS/Graphene composite nanostructure coated glassy carbon electrode (GCE). The SEM-EDAX analysis revealed that the lead sulphide nanocrystals are homogeneously embedded on the graphene nanosheets with an uniform particle size of 100 nm, and the elements presents 92.32% and Lead content of 5.45% and Sulfur content of 0.91%. Raman spectra exhibits G with respect to the E2g sp2 hybridized C-C and D band with respect to the A1g mode in the disordered edge region of the GNS. The composite nanostructure coated GCE (PbS/Graphene/GCE) was prepared and its performance in the existence of metal ions such us Cd(II),Pb(II), Mg(II), Cu(II) and Ni(II) was studied using the current voltage curves in double distilled water within the scan rates of 25 to 300mVs-1. The PbS/Graphene coated carbon electrode exhibited the higher anodic and cathodic peak current for copper solution than the other metal ions studied, which various linearly proportional to concentration. The electrochemical sensing characteristics PbS/GNS/GCE was found to be significant towards detecting Cu2+ ion within the concentration range of 1 × 10-4 to 1 × 10-8 M, with a lowest sensing detection limit of 1 × 10-8 M.
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Affiliation(s)
- T Senthil
- Department of Chemistry, Thiruvalluvar University, Vellore, 632115, India
| | - R Parkavi
- Department of Chemistry, Thiruvalluvar University, Vellore, 632115, India
| | - P Senthil Kumar
- Department of Chemical Engineering, Sri SivasubarmaniaNadar College of Engineering, Kalavakkam, 603110, Tamilnadu, India; Centre of Excellence in Water Research (CEWAR), Sri SivasubramaniyaNadar College of Engineering, Kalavakkam, 603110, India.
| | - A Chandramohan
- Department of Chemical Engineering, Sri SivasubarmaniaNadar College of Engineering, Kalavakkam, 603110, Tamilnadu, India
| | - Gayathri Rangasamy
- University Centre for Research and Development & Department of Civil Engineering, Chandigarh University, Gharuan, Mohali, Punjab, 140413, India
| | - K Srinivasan
- Department of Chemistry, Thiruvalluvar University, Vellore, 632115, India
| | - K Dinakaran
- Department of Chemistry, Thiruvalluvar University, Vellore, 632115, India.
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Dharani S, Kalaiarasi G, Lynch VM, Srinivasan K, Prabhakaran R. C–H activation and subsequent C–C bond formation in rigid alkenes catalyzed by Ru( iii) metallates. REACT CHEM ENG 2022. [DOI: 10.1039/d2re00317a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Pyrazolone derived Ru(iii) complexes were synthesized and applied as catalysts in the C–H activation reaction of α,β-unsaturated carbonyl compounds. In addition to Heck type coupling, ethanol mediated ethoxylation was also witnessed.
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Affiliation(s)
- S. Dharani
- Department of Chemistry, Bharathiar University, Coimbatore 641046, India
| | - G. Kalaiarasi
- Department of Chemistry, Bharathiar University, Coimbatore 641046, India
| | - Vincent M. Lynch
- Department of Chemistry, University of Texas, Austin, TX 78712-1224, USA
| | - K. Srinivasan
- Department of Physics, Bharathiar University, Coimbatore 641046, India
| | - R. Prabhakaran
- Department of Chemistry, Bharathiar University, Coimbatore 641046, India
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Mailsamy M, Rukkumani V, Srinivasan K. Low Power Adiabetic Logic System for Biomedical Applications. j med imaging hlth inform 2021. [DOI: 10.1166/jmihi.2021.3910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
There have been significant advances in sensors and device structures in the medical industry, particularly in implanted medical devices. Increasingly complex electronic circuitry may now be implanted in the human body thanks to compact, high-energy batteries and hermetic packaging.
These gadgets must adhere to strict power consumption guidelines due to the battery recharging schedule. Designing energy-efficient circuits and systems becomes increasingly important as a result of this fact. Adiabatic circuits provide a hopeful alternative for traditional circuitry in case
of low energy design. Because of power-clock phases synchronization complexity, designing and functionally verifying presenting 4-phase adiabatic circuitry takes longer. Accordingly, multiple clock generators are used typically and can reveal enhanced consumption of energy in the network of
clock distribution. Furthermore, they are not suitable for designing in high-speed because of their clock skew management and high complexity issues. In this paper, TMEL (True multi-phase energy recovering logic), the first energyrecovering/adiabatic logic family is presented for biomedical
applications, which functions using the scheme multiple-phase sinusoidal clocking. Moreover, a system of SCAL, a source-coupled variation with TMEL having enhanced energy efficiency and supply voltage scalability, is introduced. A novel true multi-phase Approach and Source-coupled adiabatic
logic for energy effective communication system is proposed. The adiabatic logic is employed for both write and read side operation. The CMOS inverter is integrated with TMEL cascades, which in turn reduces leakage loss. In SCAL, the optimal performance at any operating circumstance is attained
byan adjustable current source in each gate. SCAL, and TMEL, are capable of outperforming existing adiabatic logic families concerning operating speed and energy efficiency. The performance analysis was carried and simulated through 45 nm CMOS inverter in terms of leakage power, delay, and
power consumption. In particular, for the clock rates that range from 10 MHz to 200 MHz, the proposed SCAL was more energy-efficient and less dissipative on comparing their pipelined or purely combinational CMOS counterparts. In biomedical equipment, the system may be included into the low-power
design since it is energy efficient and very robust. Improvements in VLSI technology, such as increased dynamic range, low-voltage EEPROMs (electrically eraseable programmable ROMs), and specific sensor techniques, are also expected to contribute to advancements in implanted medical devices
in the near future.
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Affiliation(s)
- M. Mailsamy
- Department of Electronics and Communication, CMS College of Engineering and Technology, Coimbatore 641032, India
| | - V. Rukkumani
- Department of Electronics and Instrumentation Engineering, Sri Ramakrishna Engineering College, Coimbatore 641022, India
| | - K. Srinivasan
- Department of Electronics and Instrumentation Engineering, Sri Ramakrishna Engineering College, Coimbatore 641022, India
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Sritharan K, Manikandan V, Srinivasan K. Influence of solute-solvent interactions at the crystal-solution interface on the growth and morphology of the nonlinear optical single crystal methyl-p-hydroxybenzoate (p-MHB). J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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17
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Devasena D, Jagadeeswari M, Srinivasan K. Development of Optimized Algorithm and Field Programmable Gate Array Implementation for Bio Medical Image Denoising for Health Informatics Applications. j med imaging hlth inform 2021. [DOI: 10.1166/jmihi.2021.3851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Denoising images is a most difficult task in applications for image processing. The image specifics are preserved and the additional sounds found in the images are removed. It is also a challenge to remove noise from medical and satellite images. It improves the diagnostic capacity
of medical images and satellite images visual clarity. The noise in the images varies and its density varies depending on imaging techniques. The algorithms in the literature were suggested based on the noise density and the forms of noise. The aim of this paper is to eliminate the noise from
ultrasound, magnetic resonance images and satellite images using an effective denoisation algorithm Hybrid Wiener Adaptive Weighted Median filter (HWAWMF) which is the combination of Wiener and Adaptive Centre Pixel Weighted Median Filter (ACPWMEF). In terms of performance parameters with
an improved Peak to Signal Noise Ratio(PSNR), the hybrid filter shows better results than ACPWMEF. The Vienna filter takes out the additional noises in the images thus blurs the image’s optical perception. And also uses optimization approaches to enhance the image consistency. This paper
proposes HWAWMF (PSO HWAWMF) based on particle swarm optimization and HWAWMF based on dragonfly optimization algorithms (DOAF HWAWMF). Visual vision and PSNR also have been improved by using the optimising algorithm at an average of 3.18 db, 4.83 db, and 3.14 db for lower noise (0.0% to 30%),
medium noise (40% to 60%) as well as high noise density (70% to 90%). The efficacy of the algorithm using MATLAB R2013 is verified through both medical images, simulated and actual. In order to assess the computer complexity of the Altera algorithm for location, power and time using Cyclone
II EP2C35F672C6, Cyclone II and Stratix III EP3SL150F1152C2, this algorithm is also implemented in the Altera Field Programable Gate Array (FPGA).
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Affiliation(s)
- D. Devasena
- Department of Electronics and Information Engineering, SREC, Coimbatore 641022, India
| | - M. Jagadeeswari
- Department of Electronics and Communication Engineering, SREC, Coimbatore 641022, India
| | - K. Srinivasan
- Department of Electronics and Information Engineering, SREC, Coimbatore 641022, India
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18
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Koparkar S, Srivastava L, Randhir K, Dangat K, Pisal H, Kadam V, Malshe N, Wadhwani N, Lalwani S, Srinivasan K, Kumaran K, Fall C, Joshi S. Cognitive function and behavioral problems in children born to mothers with preeclampsia: an Indian study. Child Neuropsychol 2021; 28:337-354. [PMID: 34592908 DOI: 10.1080/09297049.2021.1978418] [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: 10/20/2022]
Abstract
Studies from high-income countries report associations of preeclampsia (PE) with reduced cognitive function and adverse behavioural outcomes in children. We examined these associations in Indian children aged 5-7 years. Children of mothers with PE (n=74) and without PE (non-PE; n=234) were recruited at delivery at Bharati Hospital, Pune, India. The cognitive performance was assessed using 3 core tests from the Kaufman Assessment Battery and additional tests including Verbal fluency, Kohs block design, and Coding A (from Wechsler Intelligence Scale for Children). The parent-reported Strengths and Difficulties Questionnaire (SDQ) was used to assess children's behavioral characteristics. Scores were compared between children from PE and non-PE groups, and associations analyzed further using regression models, adjusted for potential confounders. After adjusting for age, sex, socio-economic status and maternal education, children of PE mothers had lower Kohs block design scores (adjusted odds ratio per score category 0.57, [95% CI 0.34-0.96] p=0.034; 0.62 [95%CI (0.36, 1.07), p=0.09 on further adjustment for birth weight and gestation) compared to children of mothers without PE. In the SDQ, there was a lower prevalence of abnormal 'conduct problem' scores in PE group than non-PE group (OR=0.33, 95% CI 0.13-0.83, p=0.018, in the fully adjusted model); there were no differences for other behavioral domains. This preliminary study in Indian children suggests that fetal exposure to maternal PE may have an adverse impact on visuo-spatial performance but does not adversely affect behavior. Further studies with larger sample sizes are essential to understand effects of maternal PE on cognitive/behavioral outcomes in children.
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Affiliation(s)
- Shruti Koparkar
- Mother and Child Health, Interactive Research School for Health Affairs (IRSHA), Bharati Vidyapeeth (Deemed to Be) University, Pune, India
| | - Leena Srivastava
- Department of Paediatrics, Bharati Medical College and Hospital, Bharati Vidyapeeth Deemed University, Pune, India
| | - Karuna Randhir
- Mother and Child Health, Interactive Research School for Health Affairs (IRSHA), Bharati Vidyapeeth (Deemed to Be) University, Pune, India
| | - Kamini Dangat
- Mother and Child Health, Interactive Research School for Health Affairs (IRSHA), Bharati Vidyapeeth (Deemed to Be) University, Pune, India
| | - Hemlata Pisal
- Mother and Child Health, Interactive Research School for Health Affairs (IRSHA), Bharati Vidyapeeth (Deemed to Be) University, Pune, India
| | - Vrushali Kadam
- Mother and Child Health, Interactive Research School for Health Affairs (IRSHA), Bharati Vidyapeeth (Deemed to Be) University, Pune, India
| | - Nandini Malshe
- Department of Paediatrics, Bharati Medical College and Hospital, Bharati Vidyapeeth Deemed University, Pune, India
| | - Nisha Wadhwani
- Mother and Child Health, Interactive Research School for Health Affairs (IRSHA), Bharati Vidyapeeth (Deemed to Be) University, Pune, India
| | - Sanjay Lalwani
- Department of Paediatrics, Bharati Medical College and Hospital, Bharati Vidyapeeth Deemed University, Pune, India
| | - K Srinivasan
- Department of Psychiatry, St. John's Medical College Hospital, Bangalore, India.,Division of Mental Health and Neurosciences, St. John's Research Institute, Bangalore, India
| | - K Kumaran
- Epidemiology Research Unit, CSI, Holdsworth Memorial Hospital, Mysore, India
| | - Caroline Fall
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton, UK
| | - Sadhana Joshi
- Mother and Child Health, Interactive Research School for Health Affairs (IRSHA), Bharati Vidyapeeth (Deemed to Be) University, Pune, India
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19
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Rohith G, Rajesh BS, Archana E, Srinivasan K. Hydrogen Peroxide Poisoning-A Rare Cause of Portal Venous Gas. Indian J Radiol Imaging 2021; 31:492-494. [PMID: 34556938 PMCID: PMC8448209 DOI: 10.1055/s-0041-1734354] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Hydrogen peroxide is a clear and odorless liquid at room temperature that can easily be mistaken for water. Its ingestion results in varied clinical and radiological squeals depending on the volume and concentration of the liquid. We present a case of a 22-year-old lady who accidentally ingested 30 to 40 mL of 3% hydrogen peroxide and presented with hematemesis and abdominal pain. On further radiological evaluation, she was found to have portal venous gas and pneumatosis of the bowel wall. She was conservatively managed with 100% oxygen and nil per os for 2 days following which the portal venous gas resolved. Hydrogen peroxide ingestion causes a massive release of oxygen and when its volume exceeds its solubility in blood, gas embolism occurs that is responsible for portal venous gas and pneumatosis. Close monitoring with conservative management will suffice in mild cases without the need for any therapeutic intervention.
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Affiliation(s)
- Gorrepati Rohith
- Department of General Surgery, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Pondicherry, India
| | - B S Rajesh
- Department of General Surgery, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Pondicherry, India
| | - Elangovan Archana
- Department of General Surgery, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Pondicherry, India
| | - K Srinivasan
- Department of General Surgery, Jawaharlal Institute of Postgraduate Medical Education and Research (JIPMER), Pondicherry, India
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20
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Karthikeyan R, Sakthivel H, Rajkumar N, Srinivasan K. Interdigitating Dendritic Cell Sarcoma of the Small Intestine Presenting as Spontaneous Hemoperitoneum - A Rare Case Report. Niger J Surg 2021; 27:71-74. [PMID: 34012247 PMCID: PMC8112361 DOI: 10.4103/njs.njs_55_19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 11/01/2019] [Revised: 01/24/2020] [Accepted: 03/26/2020] [Indexed: 11/21/2022] Open
Abstract
Interdigitating dendritic cell sarcoma (IDCS) is an extremely rare neoplasm arising from the antigen-presenting cells of the immune system. It usually involves the lymph nodes, and extranodal sites are rarely affected. Here, we report a first known case of spontaneous hemoperitoneum caused by the rupture of IDCS of the small bowel. A 61-year-old male presented with complaints of abdominal pain and fever for 3 days and breathlessness for 1 day. Ultrasound abdomen revealed a 15 cm × 7 cm heterogeneous collection with thick septations in the periumbilical region. Diagnostic peritoneal lavage revealed hemoperitoneum and gangrenous bowel. Emergency laprotomy was done and it revealed a friable mass arising from the ileum. Resection of 2 ft of the ileum and double-barrel ileostomy was done. Immunohistochemical analysis revealed a positivity of S100 and leukocyte common antigen). A diagnosis of IDCS was made. The patient had an uneventful postoperative recovery and planned for postoperative chemotherapy.
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Affiliation(s)
- Raveena Karthikeyan
- Department of General Surgery, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
| | - H Sakthivel
- Department of General Surgery, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
| | - N Rajkumar
- Department of General Surgery, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
| | - K Srinivasan
- Department of General Surgery, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
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21
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Mohan VK, Rajesh K, Srinivas S, Ravi R, Prabhakaran J, Srinivasan K, Sundaramoorthy S. Unusual Presentations of Abdominal Melioidosis. J Glob Infect Dis 2021; 13:52-55. [PMID: 33911455 PMCID: PMC8054788 DOI: 10.4103/jgid.jgid_129_20] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 08/06/2020] [Accepted: 08/27/2020] [Indexed: 11/20/2022] Open
Abstract
Melioidosis is an endemic bacterial infection caused by soil saprophyte, Burkholderia pseudomallei. It infects adults with risk factors or immunosuppressed and exposed to moist soil. Its significance lies in its varied clinical presentation and high mortality (40%). We present two cases of abdominal melioidosis with unusual clinical presentations. The first case presented with intractable hiccups and had isolated splenic melioidosis with contained rupture. The second case presented with fever and acute abdominal pain found to have pancreatic melioidosis and splenic vein thrombosis. Both the patients were treated with IV antibiotics and subsequently discharged after improvement in symptoms. The imaging findings of isolated type of melioidosis can mimic various other infections and granulomatous disease. Hence high index of clinical suspicion for patients presenting from endemic areas will narrow down the differential diagnosis.
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Affiliation(s)
- Vignesh Kumar Mohan
- Department of Radiodiagnosis, Dr. Rela Institute and Medical Centre, Chennai, Tamil Nadu, India
| | - Komalavalli Rajesh
- Department of Radiodiagnosis, Dr. Rela Institute and Medical Centre, Chennai, Tamil Nadu, India
| | - Sripriya Srinivas
- Department of Radiodiagnosis, Dr. Rela Institute and Medical Centre, Chennai, Tamil Nadu, India
| | - R. Ravi
- Department of Medical Gastroenterology, Dr. Rela Institute and Medical Centre, Chennai, Tamil Nadu, India
| | - Jimmy Prabhakaran
- Department of Internal Medicine, Dr. Rela Institute and Medical Centre, Chennai, Tamil Nadu, India
| | - K. Srinivasan
- Department of Radiodiagnosis, Dr. Rela Institute and Medical Centre, Chennai, Tamil Nadu, India
| | - Subha Sundaramoorthy
- Department of Microbiology, Dr. Rela Institute and Medical Centre, Chennai, Tamil Nadu, India
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22
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Bhat A, Goud BR, Pradeep JR, Jayaram G, Radhakrishnan R, Srinivasan K. Can Mobile Health Improve Depression Treatment Access and Adherence Among Rural Indian Women? A Qualitative Study. Cult Med Psychiatry 2020; 44:461-478. [PMID: 31916181 DOI: 10.1007/s11013-019-09664-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Major Depressive Disorder (MDD) is associated with low rates of treatment and medication non-adherence, more so in low- and middle-income countries (LMICs). Mobile mental health (mHealth) interventions offer promise as a tool to address these problems. However, the feasibility and acceptability of mHealth interventions among rural women in LMICs is unknown. We examined barriers to accessing mental health treatment, reasons for non-adherence, and attitudes towards mHealth solutions among women with MDD in rural south India. Six focus groups were conducted among women with MDD (n = 69) who had been in treatment at a rural community health center. The discussion was transcribed and analyzed using a modified grounded-theory approach. Women perceived limited autonomy within their family structure, and experienced financial and systemic barriers as contributing to poor treatment access and non-adherence. Illiteracy, limited personal access to mobile phones, and preference for in-person clinical consultation were identified as barriers to use of mHealth. This is the first qualitative study, to our knowledge, that examines attitude towards mHealth among women with MDD in a rural setting in India. The study identified contextual barriers that will be important to address before implementing mHealth interventions.
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Affiliation(s)
- A Bhat
- Department of Psychiatry and Behavioral Sciences, University of Washington, NE Pacific Street, 1959, Seattle, WA, 98052, USA.
| | - B Ramakrishna Goud
- Department of Community Health, St John's Medical College, Bengaluru, India
| | - J R Pradeep
- Department of Psychiatry, St John's Medical College Hospital, Bengaluru, India
| | - G Jayaram
- Department of Psychiatry, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - R Radhakrishnan
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
- Yale Institute for Global Health, Yale University, New Haven, CT, USA
| | - K Srinivasan
- Department of Psychiatry, St John's Medical College Hospital, Bengaluru, India
- Division of Mental Health and Neurosciences, St Johns Research Institute, Bengaluru, India
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23
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Revathishree K, Shyam Sudhakar S, Indu R, Srinivasan K. Covid-19 Demographics from a Tertiary Care Center: Does It Depreciate Quality-of-Life? Indian J Otolaryngol Head Neck Surg 2020; 74:2721-2728. [PMID: 32953634 PMCID: PMC7491595 DOI: 10.1007/s12070-020-02144-w] [Citation(s) in RCA: 4] [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: 07/28/2020] [Accepted: 09/07/2020] [Indexed: 12/27/2022] Open
Abstract
Novel Coronavirus-disease-2019 (Covid-19) caused by the severe-acute-respiratory-syndrome coronavirus-2 (SARS-CoV-2) shows a rapid spread all over the world. It’s still an ongoing pandemic with greater morbidity and mortality. In our study, we describe clinical features, and demographics of patients presenting to our tertiary care center with Covid–19 infection. Global burden was around 14 million Covid-19 positive cases with .5 million deaths and rising as per WHO update. A descriptive analytical cross-sectional study was carried out from June 1st to 30th, 2020 in a tertiary care center. Patients who tested positive by Reverse Transcriptase-Polymerase chain reaction were included in the study and clinical characteristics and outcome of the patients were analyzed along with impact on quality-of-life. Sample size was 250. Mean age was around 41 years, with age range from 15 to 75 years. Gender ratio was 1:2.4, with male preponderance. Most common presenting symptom was throat pain (60%). Rhinorrhea and sneezing complaints were not recorded. Clinical categorization was done and scored accordingly. Clinical outcomes of above patients showed complication rate 5.2%, mortality rate .8%, with discharge and recovery rate being rate 94.8% and 96% respectively. Fear of COVID-19 scale was used to assess quality-of-life impact. We found throat pain was the most common symptom in our study. No cases reported with rhinorrhea/sneezing. Good recovery rate noted. Quality-of-life impacted.
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Affiliation(s)
- K Revathishree
- Department of ENT-HNS, Saveetha Medical College and Hospital, No. 1, Saveetha Nagar, Thandalam, Chennai, Tamil Nadu 602105 India
| | - Sudarsan Shyam Sudhakar
- Department of ENT-HNS, Saveetha Medical College and Hospital, No. 1, Saveetha Nagar, Thandalam, Chennai, Tamil Nadu 602105 India
| | - R Indu
- Department of ENT-HNS, Saveetha Medical College and Hospital, No. 1, Saveetha Nagar, Thandalam, Chennai, Tamil Nadu 602105 India
| | - K Srinivasan
- Department of ENT-HNS, Saveetha Medical College and Hospital, No. 1, Saveetha Nagar, Thandalam, Chennai, Tamil Nadu 602105 India
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24
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Srinivasan K, Samuel EJJ. Target biological tissue and energy influence on dose enhancement factor produced by gold nanoparticles and its relevant radiological properties. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2020.108912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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25
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Ramp H, Clark TJ, Hauer BD, Doolin CD, Balram KC, Srinivasan K, Davis JP. Wavelength transduction from a 3D microwave cavity to telecom using piezoelectric optomechanical crystals. Appl Phys Lett 2020; 116:10.1063/5.0002160. [PMID: 34815582 PMCID: PMC8607442 DOI: 10.1063/5.0002160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 03/14/2020] [Indexed: 06/13/2023]
Abstract
Microwave-to-optical transduction has received a great deal of interest from the cavity optomechanics community as a landmark application for electro-optomechanical systems. In this Letter, we demonstrate a novel transducer that combines high-frequency mechanical motion and a microwave cavity for the first time. The system consists of a 3D microwave cavity and a gallium arsenide optomechanical crystal, which has been placed in the microwave electric field maximum. This allows the microwave cavity to actuate the gigahertz-frequency mechanical breathing mode in the optomechanical crystal through the piezoelectric effect, which is then read out using a telecom optical mode. The gallium arsenide optomechanical crystal is a good candidate for low-noise microwave-to-telecom transduction, as it has been previously cooled to the mechanical ground state in a dilution refrigerator. Moreover, the 3D microwave cavity architecture can naturally be extended to couple to superconducting qubits and to create hybrid quantum systems.
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Affiliation(s)
- H. Ramp
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E9, Canada
| | - T. J. Clark
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E9, Canada
| | - B. D. Hauer
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E9, Canada
| | - C. D. Doolin
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E9, Canada
| | - K. C. Balram
- Center for Nanoscale Science and Technology, National Institute for Standards and Technology, Gaithersburg, Maryland 20878, USA
| | - K. Srinivasan
- Center for Nanoscale Science and Technology, National Institute for Standards and Technology, Gaithersburg, Maryland 20878, USA
| | - J. P. Davis
- Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E9, Canada
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26
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Iliyas M, Swaminathan N, Ravishankar G, Srinivasan K, Manimegalai E, Elangovan C, Venkatesan S, Nageshwaran P, Justin Paul G. Pharmaco-invasive therapy Vs primary PCI in A tertiary referral hospital in South India: A prospective observational study. Indian Heart J 2019. [DOI: 10.1016/j.ihj.2019.11.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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27
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Ramp H, Hauer B, Balram K, Clark T, Srinivasan K, Davis J. Elimination of Thermomechanical Noise in Piezoelectric Optomechanical Crystals. Phys Rev Lett 2019; 123:093603. [PMID: 31524457 PMCID: PMC10941253 DOI: 10.1103/physrevlett.123.093603] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Indexed: 06/10/2023]
Abstract
Mechanical modes are a potentially useful resource for quantum information applications, such as quantum-level wavelength transducers, due to their ability to interact with electromagnetic radiation across the spectrum. A significant challenge for wavelength transducers is thermomechanical noise in the mechanical mode, which pollutes the transduced signal with thermal states. In this Letter, we eliminate thermomechanical noise in the GHz-frequency mechanical breathing mode of a piezoelectric optomechanical crystal using cryogenic cooling in a dilution refrigerator. We optically measure an average thermal occupancy of the mechanical mode of only 0.7±0.4 phonons, providing a path towards low-noise microwave-to-optical conversion in the quantum regime.
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Affiliation(s)
- H. Ramp
- Department of Physics, University of Alberta, Canada
| | - B.D. Hauer
- Department of Physics, University of Alberta, Canada
| | - K.C. Balram
- Center for Nanoscale Science and Technology, National Institute for Standards and Technology, Gaithersburg, USA
| | - T.J. Clark
- Department of Physics, University of Alberta, Canada
| | - K. Srinivasan
- Center for Nanoscale Science and Technology, National Institute for Standards and Technology, Gaithersburg, USA
| | - J.P. Davis
- Department of Physics, University of Alberta, Canada
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28
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Rajendran C, Srinivasan K, Balasubramanian V, Balaji H, Selvaraj P. Data set on prediction of friction stir welding parameters to achieve maximum strength of AA2014-T6 aluminium alloy joints. Data Brief 2019; 23:103735. [PMID: 31372402 PMCID: PMC6661257 DOI: 10.1016/j.dib.2019.103735] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Revised: 01/27/2019] [Accepted: 01/31/2019] [Indexed: 12/02/2022] Open
Abstract
Statistical tools such as design of experiments (DoE), analysis of variance (ANOVA) were used to develop the empirical relationship, to predict the ultimate tensile strength of the joint at the 95% percent confidence level. Response surface graph and contour plots were constructed using response surface methodology (RSM) concept. From this investigation, it is found that the joint fabricated with a tool rotational speed of 1500 rpm, welding speed of 40 mm/min, tool tilt angle of 1.5° and tool shoulder diameter of 6 mm, exhibited maximum tensile strength of 380 MPa.
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Affiliation(s)
- C. Rajendran
- Department of Mechanical Engineering, Sri Krishna College of Engineering and Technology, Coimbatore, Tamilnadu, 641008, India
| | - K. Srinivasan
- Center for Materials & Joining and Research (CEMAJOR), Annamalai University, Tamilnadu, India
| | - V. Balasubramanian
- Center for Materials & Joining and Research (CEMAJOR), Annamalai University, Tamilnadu, India
| | - H. Balaji
- Aeronautical Development Agency, Bangalore, Karnataka, India
| | - P. Selvaraj
- Aeronautical Development Agency, Bangalore, Karnataka, India
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29
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Sridhar K, Srinivasan K. Diffusion tensor imaging and tractography in diffuse intrinsic pontine glioma - A major determinant of resectability and description of a new subtype. Neurol India 2019; 67:292-297. [PMID: 30860141 DOI: 10.4103/0028-3886.253625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- Krishnamurthy Sridhar
- Department of Neurosurgery, Gleneagles Global Health City, Chennai, Tamil Nadu, India
| | - K Srinivasan
- Department of Radiology, Gleneagles Global Health City, Chennai, Tamil Nadu, India
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30
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Clogher P, Clogher P, Srinivasan K, Maloney M, Meek J. Point Prevalence and Characteristics of In-House Antimicrobial Use in Nursing Homes, New Haven and Hartford Counties, Connecticut, 2017. J Am Med Dir Assoc 2019. [DOI: 10.1016/j.jamda.2019.01.111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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31
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Dinesh M, Ravindran R, Rukkumani V, Srinivasan K, Saravanakumar M. Effect of Oxygen Vacancy on Structural, Optical and Magnetic Behavior of Tin Oxide Nanoparticles. Int J Nanosci 2019. [DOI: 10.1142/s0219581x1850045x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Nanocrystalline SnO2powder has been successfully synthesized by using tin(II) chloride dihydrate (SnCl[Formula: see text]H2O), distilled water and liquid ammonia by the simple chemical co-precipitation method at room temperature using different SnCl[Formula: see text]H2O molar concentration of 0.3[Formula: see text]M, 0.4[Formula: see text]M and 0.5[Formula: see text]M. The structural properties of the prepared SnO2and transition metal doped SnO2nanoparticles has been studied using X-ray diffraction method and scanning electron microscope. The composition of the powders has been analyzed using energy dispersive X-ray analysis. The XRD pattern of the SnO2nanoparticles indicates the formation of single-phase rutile tetragonal structure. The grain size is found to be in the range of 3–7[Formula: see text]nm and is found to increase with increasing SnCl2molar concentration. The absorption spectra revealed that the bandgap decreased from 3.74[Formula: see text]eV to 3.59[Formula: see text]eV with increasing SnCl2molar concentration. The photoluminescence spectra of SnO2nanoparticles showed a visible broad luminescence band in the region of 385–430[Formula: see text]nm. The magnetic studies have been carried out using the hysteresis loop obtained from a vibrating sample magnetometer. The SnO2samples using 0.3 and 0.4 SnCl2molar concentration exhibited ferromagnetic behavior whereas the SnO2sample prepared using 0.5[Formula: see text]M SnCl[Formula: see text]H2O exhibited paramagnetic nature.
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Affiliation(s)
- M. Dinesh
- Department of Mechanical Engineering, SVS College of Engineering, Coimbatore-642109, India
| | - R. Ravindran
- Department of Mechanical Engineering, Dr. Mahalingam College of Engineering and Technology, Pollachi-642003, India
| | - V. Rukkumani
- Department of Mechanical Engineering, Dr. Mahalingam College of Engineering and Technology, Pollachi-642003, India
| | - K. Srinivasan
- Department of EIE, Sri Ramakrishna Engineering College Coimbatore, India
| | - M. Saravanakumar
- Department of Physics, Gobi Arts and Science College, Gobichettipalayam, India
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Abstract
Significant efforts have been made to address the hidden hunger challenges due to iron, zinc, iodine, and vitamin A since the beginning of the 21st century. Prioritizing the vitamin A deficiency (VAD) disorders, many countries are looking for viable alternative strategies such as biofortification. One of the leading causes of VAD is the poor bioconversion of β-carotene into retinoids. This review is focused on the opportunities of bacterial biosynthesis of retinoids, in particular, through the gut microbiota. The proposed hypothesis starts with the premise that an animal can able to store and timely convert carotenoids into retinoids in the liver and intestinal tissues. This theory is experimental with many scientific insights. The syntrophic metabolism, potential crosstalk of bile acids, lipocalins and lipopolysaccharides of gut microbiota are reported to contribute significantly to the retinoid biosynthesis. The gut bacteria respond to these kinds of factors by genetic restructuring driven mainly by events like horizontal gene transfer. A phylogenetic analysis of β-carotene 15, 15'-mono (di) oxygenase enzymes among a selected group of prokaryotes and eukaryotes was carried out to validate the hypotheses. Shedding light on the probiotic strategies through non-genetically modified organism such as gut bacteria capable of synthesizing vitamin A would address the VAD disorders.
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Affiliation(s)
- K Srinivasan
- Department of Consumer and Food Sciences, University of Pretoria, Hatfield Campus, Pretoria, South Africa
| | - Elna M Buys
- Department of Consumer and Food Sciences, University of Pretoria, Hatfield Campus, Pretoria, South Africa
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Srinivasan K, Jabaseelan Samuel EJ. Water equivalent radiological properties of Gafchromic external beam therapy and external beam therapy 2 film dosimeters. J Cancer Res Ther 2019; 15:S97-S102. [DOI: 10.4103/jcrt.jcrt_965_16] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Gnanaraj J, Princy A, Majella C, Srinivasan K, S V, N S, David P, Gunasingh S, P P, Susikar A, Rangarajan J. PO311 Sailing Through Pregnancy With a Prosthetic Heart Valve. Glob Heart 2018. [DOI: 10.1016/j.gheart.2018.09.250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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35
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Srinivasan K, Subramanian K, Murugan K, Dinakaran K. Sensitive fluorescence detection of mercury(ii) in aqueous solution by the fluorescence quenching effect of MoS 2 with DNA functionalized carbon dots. Analyst 2018; 141:6344-6352. [PMID: 27704070 DOI: 10.1039/c6an00879h] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A rapid and sensitive fluorescent sensor based on the MoS2 nanosheet/DNA/carbon dot nanoassembly has been developed towards the detection of mercury(ii) present in environmental samples. Bio-carbon dots (CDs) having strong fluorescence maxima at 451 nm were synthesized via one-step treatment with honey under low temperature carbonization. These CDs were nearly spherical with good size distribution and excellent monodispersity, and the average sizes of CD were around 2-4 nm as evidenced from transmission electron microscopy. The conjugation of DNA strands on the surface of the carbon dots provided an efficient fluorescent probe. The fluorescence of the MoS2 nanosheet/DNA/carbon dot nanoassembly enhanced gradually with the increase in the concentration of Hg2+ ions and the detection limit was found to be 1.02 nM. Furthermore, the fluorescence intensity was found to be linear with the concentration of Hg2+ ions in the range from 0 to 10 nM and their respective coefficient of determination was found to be 0.93676 and 0.98178. The present MoS2 nanosheet/DNA/carbon dot nanoassembly is highly selective toward Hg2+ ions over a wide range of metal ions tested.
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Affiliation(s)
- K Srinivasan
- Department of Chemistry, Anna University, Guindy, Chennai - 600 025, India
| | - K Subramanian
- Department of Chemistry, Anna University, Guindy, Chennai - 600 025, India
| | - K Murugan
- Department of Zoology, Bharathiar University, Coimbatore - 641 046, India
| | - K Dinakaran
- Department of Chemistry, Thiruvalluvar University, Vellore - 632 115, India.
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36
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Haseena BA, Srinivasan K. Development of mixed constrained RTDA controller for industrial applications. ISA Trans 2018; 81:197-209. [PMID: 30054036 DOI: 10.1016/j.isatra.2018.07.005] [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: 03/13/2018] [Revised: 05/23/2018] [Accepted: 07/07/2018] [Indexed: 06/08/2023]
Abstract
Most of the industrial processes are MIMO and constrained in nature. So the development of MIMO constrained controller is always preferable and makes challenges to the control community. This paper proposes the development of constrained next generation RTDA controller to handle various linear inequality constraints in a multi-variable control framework. The Lagrangian function is formulated, and the dual problem is solved using Hildreth's algorithm. The combined hard-soft constrained RTDA optimization problem with exact penalty functions is solved using KKT conditions. Performance of the developed constrained RTDA controller is demonstrated using simulation studies of typical industrial unit operations such as nonlinear CSTR process and Wood and Berry distillation column. The performance of the constrained RTDA controller is compared with constrained DMC and GPC.
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Affiliation(s)
- B A Haseena
- Instrumentation and Control Engineering Department, National Institute of Technology, Tiruchirappalli 620015, India.
| | - K Srinivasan
- Instrumentation and Control Engineering Department, National Institute of Technology, Tiruchirappalli 620015, India.
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Shenoy SV, Srinivasan K. Relationship of IPO Issue Price and Listing Day Returns with IPO Pricing Parameters. International Journal of Management Studies 2018. [DOI: 10.18843/ijms/v5i4(1)/02] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Vinodhini K, Srinivasan K. The Effect of Power, Pulse Rate and Treatment Time of Sonication on the Nucleation and Growth of α-Lactose Monohydrate (α-LM) Single Crystals from Aqueous Solution. Crystal Research and Technology 2018. [DOI: 10.1002/crat.201700227] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Kandasamy Vinodhini
- Crystal Growth Laboratory; Department of Physics; School of Physical Sciences; Bharathiar University; Coimbatore 641 046 Tamil Nadu India
| | - K. Srinivasan
- Crystal Growth Laboratory; Department of Physics; School of Physical Sciences; Bharathiar University; Coimbatore 641 046 Tamil Nadu India
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Padmanabhan M, Agarwal S, Reddy S, Thumsi J, Srinivasan K, Subramanian M, Jaison G, Ganganna R, Sunkappa Dayashankara S, Suresh Jadhav S. Poor penetrance of Deep inspiratory breath hold (DIBH) Gating technique in treatment of left sided breast cancers in developing countries. Eur J Cancer 2018. [DOI: 10.1016/s0959-8049(18)30409-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abstract
Context: Lead is the conventional shielding material against gamma/X-rays. It has some limitations such as toxic, high density, nonflexibility, and also bremsstrahlung production during electron interaction. It may affect the accuracy of radiotherapy outcome. Aims: To theoretically analyze the radiation shielding properties of flexible polyvinyl alcohol/iron oxide polymer composite with five different concentrations of magnetite over the energy range of 15 KeV–20 MeV. Subjects and Methods: Radiological properties were calculated based on the published literature. Attenuation coefficients of pure elements are generated with the help of WinXCOM database. Results: Effective atomic numbers and electron density are increased with the concentration of magnetite. On the other hand, the number of electrons per gram decreased. Mass attenuation coefficient (μ/ϼ) and linear attenuation coefficients (μ) are higher in the lower energy <100 KeV, and their values decreased when the energy increased. Computed tomography numbers (CT) show the significant variation between the concentrations in <60 KeV. Half-value layer and tenth-value layers are directly proportional to the energy and indirectly proportional to the concentration of magnetite. Transmission curve, relaxation length (ƛ), kinetic energy released in the matter, and elemental weight fraction are also calculated and the results are discussed. Conclusions: 0.5% of the magnetite gives superior shielding properties compared with other concentrations. It may be due to the presence of 0.3617% of Fe. Elemental weight fraction, atomic number, photon energy, and mass densities are the important parameters to understand the shielding behavior of any material.
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Affiliation(s)
- K Srinivasan
- Department of Oncology, M P Birla Hospital and Priyamvada Birla Cancer Research Institute, Satna, Madhya Pradesh.,Department of Physics, School of Advanced Sciences, VIT University, Vellore, Tamil Nadu, India
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41
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Srinivasan K, Sharma SS. Endocrine Pharmacology Research in India: Scientific Progress in Last Five Years. Proceedings of the Indian National Science Academy 2018. [DOI: 10.16943/ptinsa/2018/49303] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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42
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Hariharan A, Srinivasan K, Murthy C, Alagar M. Synthesis and characterization of a novel class of low temperature cure Benzoxazines. J Polym Res 2017. [DOI: 10.1007/s10965-017-1423-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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43
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Srinivasan K. Memorable clinical experiences, all in one year at Queen Square, London, United Kingdom (1968-1969): A tribute to Neurology legends. Neurol India 2017; 65:944-947. [PMID: 28879872 DOI: 10.4103/neuroindia.ni_736_17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- K Srinivasan
- Past President, Neurological Society of India, Department of Neurology, Madurai Medical College, Madurai, Tamil Nadu, India
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45
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Affiliation(s)
- A. Hariharan
- Centre of Excellence in Advanced
Material Manufacturing, Processing and Characterization (CoExAMMPC), Vignan University, Vadlamudi, Guntur-522 213, India
| | - K. Srinivasan
- Centre of Excellence in Advanced
Material Manufacturing, Processing and Characterization (CoExAMMPC), Vignan University, Vadlamudi, Guntur-522 213, India
| | - C. Murthy
- Centre of Excellence in Advanced
Material Manufacturing, Processing and Characterization (CoExAMMPC), Vignan University, Vadlamudi, Guntur-522 213, India
| | - M. Alagar
- Centre of Excellence in Advanced
Material Manufacturing, Processing and Characterization (CoExAMMPC), Vignan University, Vadlamudi, Guntur-522 213, India
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Abstract
<p>In the design of AFVs, study of structures subjected to land mine blast is important. Generally, blast related experimental studies are very time consuming and costly. A simple first cut alternative is finite element modelling and analysis. Here, modelling of mine and simulating the blast effect involves large number of mesh elements, which makes the model computationally intensive and time consuming. Hence, instead of using full scale model for analysis, a suitable scaled down model would reduce analysis time and leads to a faster DOE studies. A proper scaling mechanism is to be evolved in order to get accurate results. Discusses about the scaling of plate subjected to mine blast using dimensional analysis approach. The out-of-plane surface deformation, including velocity fields during the blast loading are compared between the scaled and unscaled plate.</p>
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Affiliation(s)
- T. P. Purdy
- Joint Quantum Institute, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - K. E. Grutter
- Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - K. Srinivasan
- Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - J. M. Taylor
- Joint Quantum Institute, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
- Joint Center for Quantum Information and Computer Science, University of Maryland, College Park, MD 20742, USA
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48
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Finkelstein JL, Kurpad AV, Thomas T, Srinivasan K, Duggan C. Vitamin B 12 status in pregnant women and their infants in South India. Eur J Clin Nutr 2017; 71:1046-1053. [PMID: 28402324 DOI: 10.1038/ejcn.2017.29] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Revised: 11/19/2016] [Accepted: 02/14/2017] [Indexed: 12/29/2022]
Abstract
BACKGROUND/OBJECTIVES Vitamin B12 deficiency during pregnancy has been associated with increased risk of adverse perinatal outcomes. However, few studies have investigated the burden and determinants of vitamin B12 status in young infants. This study was conducted to determine the associations between maternal and infant vitamin B12 status. SUBJECTS/METHODS Pregnant women participating in a vitamin B12 supplementation trial in Bangalore, India, were randomized to receive vitamin B12 (50 μg) or placebo supplementation daily during pregnancy through 6 weeks postpartum. All women received 60 mg of iron and 500 μg of folic acid daily during pregnancy, as per standard of care. This prospective analysis was conducted to determine the associations between maternal vitamin B12 biomarkers (that is, plasma vitamin B12, methylmalonic acid (MMA) and tHcy) during each trimester with infant vitamin B12 status (n=77) at 6 weeks of age. RESULTS At baseline (⩽14 weeks of gestation), 51% of mothers were vitamin B12 deficient (vitamin B12<150 pmol/l) and 43% had impaired vitamin B12 status (vitamin B12<150 pmol/l and MMA>0.26 μmol/l); 44% of infants were vitamin B12 deficient at 6 weeks of age. After adjusting for vitamin B12 supplementation, higher vitamin B12 concentrations in each trimester were associated with increased infant vitamin B12 concentrations and lower risk of vitamin B12 deficiency in infants (P<0.05). After adjusting for vitamin B12 supplementation, infants born to women with vitamin B12 deficiency had a twofold greater risk of vitamin B12 deficiency (P<0.01). Higher maternal folate concentrations also predicted lower risk of vitamin B12 deficiency in infants (P<0.05). Impaired maternal vitamin B12 status, which combined both circulating and functional biomarkers, was the single best predictor of infant vitamin B12 status. CONCLUSIONS Impaired maternal vitamin B12 status throughout pregnancy predicted higher risk of vitamin B12 deficiency in infants, after adjusting for vitamin B12 supplementation. Future interventions are needed to improve vitamin B12 status periconceptionally, and to ensure optimal vitamin B12 status and health outcomes in pregnant women and their children.
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Affiliation(s)
- J L Finkelstein
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, USA.,Division of Nutrition, St. John's Research Institute, Bangalore, India
| | - A V Kurpad
- Division of Nutrition, St. John's Research Institute, Bangalore, India.,Department of Physiology, St. John's Medical College, Bangalore, India
| | - T Thomas
- Division of Epidemiology, Biostatistics and Population Health, St. John's Research Institute, Bangalore, India
| | - K Srinivasan
- Division of Mental Health and Neurosciences, St. John's Research Institute, Bangalore, India.,Department of Psychiatry, St. John's Medical College, Bangalore, India
| | - C Duggan
- Division of Nutrition, St. John's Research Institute, Bangalore, India.,Department of Nutrition, Harvard T.H. Chan School of Public Health and Center for Nutrition, Boston Children's Hospital, Boston, MA, USA
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Bhattacharyya T, Anandalakshmi R, Srinivasan K. Heat Transfer Analysis on Finned Plate Air Heating Solar Collector for its Application in Paddy Drying. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.egypro.2017.03.086] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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50
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Teimourpour M, Rahman A, Srinivasan K, El-Ganainy R. Non-Hermitian engineering of synthetic saturable absorbers for applications in photonics. Phys Rev Appl 2017; 7:014015. [PMID: 28580374 PMCID: PMC5455789 DOI: 10.1103/physrevapplied.7.014015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We introduce a new type of synthetic saturable absorber based on quantum-inspired Jx photonic arrays. We demonstrate that the interplay between optical Kerr nonlinearity, interference effects and non-Hermiticity through radiation loss leads to a nonlinear optical filtering response with two distinct regimes of small and large optical transmissions. More interestingly, we show that the boundary between these two regimes can be very sharp. The threshold optical intensity that marks this abrupt "phase transition" and its steepness can be engineered by varying the number of the guiding elements. The practical feasibility of these structures as well as their potential applications in laser systems and optical signal processing are also discussed.
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Affiliation(s)
- M.H. Teimourpour
- Department of Physics, Michigan Technological University, Houghton, Michigan 49931, USA
- Henes Center for Quantum Phenomena, Michigan Technological University, Houghton, Michigan 49931, USA
| | - A. Rahman
- Department of Physics, Michigan Technological University, Houghton, Michigan 49931, USA
- Henes Center for Quantum Phenomena, Michigan Technological University, Houghton, Michigan 49931, USA
| | - K. Srinivasan
- Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
| | - R. El-Ganainy
- Department of Physics, Michigan Technological University, Houghton, Michigan 49931, USA
- Henes Center for Quantum Phenomena, Michigan Technological University, Houghton, Michigan 49931, USA
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