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Serological surveillance for SARS-coV-2 antibodies among students,faculty and staff within a large university system during the pandemic

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World Journal of Virology 2025年第1期14卷 99-107页

作者： Marcos G Pinheiro Gabriela G O Alves Maria Eduarda R conde Sofia L costa Regina c S Sant’Anna Isa M F Antunes Mônica c carneiro Fabio S Ronzei Julia c Scaffo Felipe R Pinheiro Lialyz S Andre Helvecio c Povoa Valéria t Baltar Fabíola Giordani Eduarda S Hemerly Gisele c Alexandre Karla c de Paula Márcio Watanabe Antonio claudio L da Nóbrega Jackeline christiane P Lobato Fabio Aguiar-Alves Laboratory of Molecular Epidemiology and Biotechnology Rodolpho Albino University LaboratoryFluminense Federal UniversityNiterói 24241000Rio de JaneiroBrazil Estácio de SáUniversity Nova Friburgo 28611135Rio de JaneiroBrazil Pathology Program Medicine schoolFluminense Federal UniversityNiterói 24070090Rio de JaneiroBrazil Department of Pharmaceutical Sciences Lloyd L.Gregory School of PharmacyPalm Beach Atlantic UniversityWest Palm BeachFL 33401United States Health Institute of Nova Friburgo Fluminense Federal UniversityNova Friburgo 28613001Rio de JaneiroBrazil Department of Epidemiology and Biostatistics Institute of Collective Health(ISC)Fluminense Federal UniversityNiterói 24033900Rio de JaneiroBrazil Institute of Physical Educ.t.on Fluminense Federal UniversityNiterói 24020005Rio de JaneiroBrazil Department of Statistics Fluminense Federal UniversityNiterói 24210200Rio de JaneiroBrazil Department of Physiology and Pharmacology Fluminense Federal UniversityNiterói 24210130Rio de JaneiroBrazil

BAcKGROUND At the end of December 2019,the world faced severe ac.t. respiratory syndrome-coronavirus 2(SARS-coV-2),which led to the outbreak of coronavirus disease 2019(cOVID-19),associated with respiratory *** virus has shown significant challenges,especially for senior c.t.zens,patients with other underlying illnesses,or those with a sedentary *** tests conducted early on have helped identify how the virus is transmitted and how to curb its *** study hypothesis was that the rapid serological test for SARS-coV-2 antibodies could indic.t. the immunoreactive profile during the cOVID-19 pandemic in a university *** to conduct active surveillance for serological expression of anti-SARS-coV-2 antibodies in individuals within a university setting during the cOVID-19 *** this sectional study by convenience sampling was conducted in a large university in Niteroi-RJ,Brazil,from March 2021 to July *** study population consisted of students,faculty,and administrative staff employed by the university.A total of 3433 faculty members,60703 students,and 3812 administrative staff were invited to *** were gathered through rapid serological tests to detect immunoglobulin(Ig)M and IgG against ***χ²or Fisher's exact test was used to conduct statistical analysis.A 0.20 significance level was adopted for variable selection in a multiple logistic regression model to evaluate *** A total of 1648 individuals were enrolled in the *** proportion of cOVID-19 positivity was 164/1648(9.8%).the adjusted logistic model indic.t. a positive association between the expression of IgM or IgG and age[odds ratio(OR)=1.16,95%cI:1.02-1.31](Pcontact with a cOVID-19-positive case(OR=3.49,95%cI:2.34-5.37)(Pthose who had received the cOVID-19 vaccine(OR=2.33,95%cI:1.61-3.35)(Pcial isolation(OR=0.59,95%cI:0.41-0.84)(Pthe likelihood of sho

关键词： Serological surveillance SARS-coV-2 antibodies cOVID-19 Serological rapid test Risk factors for cOVID-19

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cOMPUtAtIONAL tEcHNIQUE FOR FLOW IN BLOODVESSELS WItH POROUS EFFEctS

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Applied Mathematics and Mechanics(English Edition) 2005年第1期26卷 63-72页

作者： Anil kumar c.L.Varshney G.c.Sharma Department of Post-Graduate Studies and Research in Mathematics &computer Science S.Varshney College Aligarh-202001 IndiaDepartment of Post-Graduate Studies and Research in Mathematics &Computer Science S.Varshney College Aligarh-202001 IndiaInstitute of Basic Science Khandari Agra-282002 India

A finite element solution for the Navier-Stokes equations for steady flow under the porosity effects through a double branched two-dimensional section of a three-dimensional model of a canine aorta was obtained. the numerical solution involves transforming a physical coordinates to a curvilinear boundary fitted coordinate *** steady flow,branch flow and shear stress under the porous effects were discussed in detail. the shear stress at the wall was calculated for Reynolds number of 1 000 with branch to main aortic flow rate ratio as a parameter. the results are compared with earlier works involving experimental data and it has been observed that our results are very close to the exact *** work is in fact an improvement of the work of Sharma et al. (2001) in the sense that computational technique is economic and (Reynolds) number is large.

关键词： wall shear stress porosity Galerkin's technique blood vessel

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A novel PV array configuration for enhancing maximum power from PV array

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clean Energy 2022年第6期6卷 817-826页

作者： Dharani kumar Narne t.A.Ramesh kumar Rama Koteswara Rao Alla Department of Electrical Engineering Annamalai UniversityAnnamalai NagarChidambaramTamilnadu-608002India Department of Electrical and Electronics Engineering RVR&JC College of EngineeringGunturAndhra Pradesh-522019India

Partial shading conditions(PSc)are unavoidable and are the main reason for the reduction in power from a photovoltaic(PV)*** proper arrangement,the impact of PSc can be somewhat *** are distinct types of configurations,including series,parallel,series-parallel(SP),honeycomb,total cross-tied(tct),*** article presents a novel SP-tct configuration to maximize output power from PV panels under different shading *** proposed configuration performance has been examined considering a 4×4 PV array under long-narrow and long-wide,short-narrow,short-wide and uniform shading *** results of the proposed configurations are compared with existing configurations in terms of performance measures such as maximum power,fill factor,efficiency and mismatch *** all the cases,performance of the proposed configuration is nearer to the tct configuration *** percentage improvement in terms of efficiency for the proposed novel SP-tct configuration and tct configuration is nearly 1.6%compared to other methods.

关键词： maximum power shading patterns PV array efficiency

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transient thermal Distribution in a Wavy Fin Using Finite Difference Approximation Based Physics Informed Neural Network

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computer Modeling in Engineering & Sciences 2024年第12期141卷 2555-2574页

作者： Sara Salem Alzaid Badr Saad t.Alkahtani kumar chandan Ravikumar Shashikala Varun kumar Department of Mathematics College of ScienceKing Saud UniversityRiyadh11451Saudi Arabia Amrita School of Artificial Intelligence Amrita Vishwa VidyapeethamBengaluruKarnataka560035India Department of Pure and Applied Mathematics School of Mathematical SciencesSunway UniversityJalan UniversityBandar SunwaySelangor Darul Ehsan47500Malaysia

Heat transport has been significantly enhanced by the widespread usage of extended surfaces in various engi-neering *** turbine blade cooling,refrigeration,and electronic equipment cooling are a few prevalent ***,the thermal analysis of extended surfaces has been the subject of a significant assessment by *** by this,the present study describes the unsteady thermal dispersal phenomena in a wavy fin with the presence of convection heat *** analysis also emphasizes a novel mathematical model in accordance with transient thermal change in a wavy profiled fin resulting from convection using the finite difference method(FDM)and physics informed neural network(PINN).the time and space-dependent governing partial differential equation(PDE)for the suggested heat problem has been translated into a dimensionless form using the relevant dimensionless *** graph depicts the effect of thermal parameters on the fin’s thermal *** temperature dispersion in the fin decreases as the dimensionless convection-conduction variable *** heat dispersion in the fin is decreased by increasing the aspect ratio,whereas the reverse behavior is seen with the time ***,FDM-PINN results are validated against the outcomes of the FDM.

关键词： Heat transfer convection fin machine learning physics informed neural network

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Multivariate Broadcast Encryption with Group Key Algorithm for Secured Iot

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computer Systems Science & Engineering 2023年第4期45卷 925-938页

作者： M.Suresh kumar t.Purosothaman Department of computer Sceince and Engineering Sri Ranganathar Institute of Engineering and TechnologyCoimbatore641110India Department of Electronics and communic.t.on Engineering Government College of TechnologyCoimbatore641013India

the expanding and ubiquitous availability of the Internet of things(Iot)have changed everyone’s life easier and more *** time it also offers a number of issues,such as effectiveness,security,and excessive power consumption,which constitute a danger to intelligent Iot-based *** managing is primarily used for transmitting and multi-pathing communic.t.ons that are secured with a general group key and it can only be decrypted by an authorized group member.A centralized trustworthy system,which is in charge of key distribution and upgrades,is used to maintain group *** provide longitudinal access controls,Software Defined Network(SDN)based security controllers are employed for group administration *** service providers provide a variety of security *** are just a few software security answers *** the proposed system,a hybrid protocols were used in SDN and it embeds edge system to improve the security in the group ***-based algorithms compared with Group Key Establishment(GKE)and Multivariate public key cryptosystem with Broadcast Encryption in the proposed *** all factors are considered,Broadcast Encryption(BE)appears to become the most logical solution to the *** enables an initiator to send encrypted messages to a large set of recipients in a efficient and productive way,meanwhile assuring that the data can only be decrypted by defining *** proposed method improves the security,efficiency of the system and reduces the power consumption and minimizes the cost.

关键词： Internet of things encryption decryption group key software defined network public key security

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AVirtual cloud Storage Architecture for Enhanced Data Security

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computer Systems Science & Engineering 2023年第2期44卷 1735-1747页

作者： M.Antony Joans kumar c.christopher columbus E.Ben George t.Ajith Bosco Raj Department of Information technology St.Xavier’s Catholic College of EngineeringNagercoil629003Tamil NaduIndia Department of computer Science Engineering PSN College of Engineering and TechnologyTirunelveli627152India Department of computer Science Engineering University of Technology and Applied SciencesMuscat112Oman Department of Electronics and communic.t.ons Engineering PSN College of Engineering and TechnologyTirunelveli627152India

the sensitive data stored in the public cloud by privileged users,such as corporate companies and government agencies are highly vulnerable in the hands of cloud providers and *** proposed Virtual cloud Storage Archi-tecture is primarily concerned with data integrity and conﬁdentiality,as well as *** provide conﬁdentiality and availability,theﬁle to be stored in cloud storage should be encrypted using an auto-generated key and then encoded into distinct *** the encoded chunks ensured theﬁle integrity,and a newly proposed circular Shift chunk Alloc.t.on technique was used to determine the order of chunk ***ﬁle could be retrieved by performing the opera-tions in *** the regenerating code,the model could regenerate the missing and corrupted chunks from the *** proposed architecture adds an extra layer of security while maintaining a reasonable response time and sto-rage *** results analysis show that the proposed model has been tested with storage space and response time for storage and *** VcSA model consumes 1.5x(150%)storage *** was found that total storage required for the VcSA model is very low when compared with 2x Replic.t.on and completely satisﬁes the cIA *** response time VcSA model was tested with different sizedﬁles starting from 2 to 16 *** response time for storing and retrieving a 2 MBﬁle is 4.96 and 3.77 s respectively,and for a 16 MBﬁle,the response times are 11.06 s for storage and 5.6 s for retrieval.

关键词： Erasure code regenerating code cryptography virtual cloud storage architecture circular shift chunk alloc.t.on algorithm

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Fuzzy Based Interleaved Step-up converter for Electric Vehicle

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Intelligent Automation & Soft computing 2023年第1期35卷 1103-1118页

作者： t.Saravanakumar R.Saravana kumar School of Electrical Engineering Vellore Institute of TechnologyVellore632014India

this work focuses on the fuzzy controller for the proposed three-phase interleaved Step-up converter(ISc).the fuzzy controller for the proposed ISc converters for electric vehicles has been discussed in *** proposed ISc direct current(Dc-Dc)converter could also be used in automobiles,satellites,industries,and *** enhance voltage gain,the proposed ISc converter combines boost converter and interleaved converter(Ic).this design also reduces the number of *** a result,ISc converter switching losses are *** proposed ISc converter topology can produce a 143 V output voltage and 1 kW of *** to the high voltage gain of this converter design,it is suitable for medium and high-power *** proposed ISc converter topology is simulated in MAtLAB/*** simulated output displays a high output *** the output voltage contains maximum *** proposes an ISc converter which makes closed loop responsiveness and reduces the output voltage *** proposed ISc converter has the lowest ripple output voltage,which is less than 2%,because the duty cycle is regulated using the fuzzy logic *** offers high voltage gain,minimal ripple,and low switching *** performance of the proposed converter is compared to that of the fuzzy and Pro-portional Integral(PI)controllers implemented in MAtLAB.

关键词： Step-up converter interleaved converter ripple voltage fuzzy electric vehicles

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Proterozoic orogenic belts and rifting of Indian cratons: Geophysical constraints

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Geoscience Frontiers 2014年第1期5卷 25-41页

作者： D.c.Mishra M.Ravi kumar National Geophysical Research Institute (cSIR) Gravity GroupHyderabad 500007 India Indian Institute of Geomagnetism Navi Mumbai 410218 India

the Aravalli-Delhi and Satpura Mobile Belts （ADMB and SMB） and the Eastern Ghat Mobile Belt （EGMB） in India form major Proterozoic mobile belts with adjoining cratons and contemporary basins. the most convincing features of the ADMB and the SMB have been the crustal layers dipping from both sides in opposite directions, crustal thickening （ -45 km） and high density and high conductivity rocks in upper/ lower crust associated with faults/thrusts. these observations indic.t. convergence while domal type re- flectors in the lower crust suggest an extensional rifting phase. In case of the SMB, even the remnant of the subducting slab characterized by high conductive and low density slab in lithospheric mantle up to - 120 km across the Purna-Godavari river faults has been traced which may be caused by fluids due to metamorphism. Subduction related intrusives of the SMB south of it and the ADMB west of it suggest N-S and E-W directed convergence and subduction during Meso-Neoproterozoic convergence. the simultaneous E-W conver- gence between the Bundelkhand craton and Marwar craton （Western Rajasthan） across the ADMB and the N-S convergence between the Bundelkhand craton and the Bhaodara and Dharwar cratons across the SMB suggest that the forces of convergence might have been in a NE SW direction with E-W and N-S compo- nents in the two cases, respectively. this explains the arcuate shaped collision zone of the ADMB and the SMB which are connected in their western part. the Eastern Ghat Mobile Belt （EGMB） also shows signatures orE -W directed Meso Neoproterozoic convergence with East Antarctica similar to ADMB in north India. Foreland basins such as Vindhyan （ADMB-SMB）, and Kurnool （EGMB） Supergroups of rocks were formed during this convergence. Older rocks such as Aravalli （ADMB）, Mahakoshal-Bijawar （SMB）, and cuddapah （EGMB） Supergroups of rocks with several basic/ultrabasic intrusives along these mobile belts, plausibly formed during an earlier episode of rifting during

关键词： Indian Shield convergence collision Rifting Geophysical anomalies

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Radiative heat transfer analysis of a concave porous fin under the local thermal non-equilibrium condition:applic.t.on of the clique polynomial method and physics-informed neural networks

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Applied Mathematics and Mechanics(English Edition) 2024年第9期45卷 1613-1632页

作者： K.cHANDAN K.KARtHIK K.V.NAGARAJA B.c.PRASANNAkumarA R.S.VARUN kumar t.MUHAMMAD Amrita School of Artificial Intelligence Amrita Vishwa VidyapeethamBengaluru 560035KarnatakaIndia Department of Studies in Mathematics Davangere UniversityDavangere 577002KarnatakaIndia computational Science Lab Amrita School of EngineeringAmrita Vishwa VidyapeethamBengaluru 560035KarnatakaIndia Department of Pure and Applied Mathematics School of Mathematical SciencesSunway UniversityPetaling Jaya 47500Malaysia Department of Mathematics College of ScienceKing Khalid UniversityAbha 61413Saudi Arabia

the heat transfer through a concave permeable fin is analyzed by the local thermal non-equilibrium(LtNE)*** governing dimensional temperature equations for the solid and fluid phases of the porous extended surface are modeled,and then are nondimensionalized by suitable dimensionless ***,the obtained nondimensional equations are solved by the clique polynomial method(cPM).the effects of several dimensionless parameters on the fin's thermal profiles are shown by graphical ***,the current study implements deep neural structures to solve physics-governed coupled equations,and the best-suited hyperparameters are attained by comparison with various network *** results of the cPM and physicsinformed neural network(PINN)exhibit good agreement,signifying that both methods effectively solve the thermal modeling problem.

关键词： heat transfer fin porous fin local thermal non-equilibrium(LtNE)model physics-informed neural network(PINN)

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Intermediate Energy coulomb Exc.t.tion of Neutron-Rich Nuclei

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chinese Physics Letters 2010年第3期27卷 104-107页

作者： Rajiv kumar Rajesh Kharab H. c. Sharma Department of Applied Sciences Haryana College of Technology and Management Kaithal-136027 India Department of Physics Kurukshetra University Kurukshetra-136119 India

We reinvestigate the collective effects of the retardation as well as the bending on the coulomb exc.t.tion cross sections and also on the B（E2） strengths of some neutron-rich isotopes using the intermediate energy coulomb exc.t.tion theory. It is found that the B（E2） strengths extracted from the experimental coulomb exc.t.tion cross section data get suppressed approximately by 6%. Furthermore, the obtained B（E2） strengths in the energy range 30-100 MeV/A are found to be in better agreement with the corresponding values known from other sources, than those obtained by using the recoil-corrected relativistic coulomb exc.t.tion theory.

关键词： Nuclear physics

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