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m.them.tical m.deling Applied to Understand the Dynam.cal Behavior of HIV Infection

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Open Journal of m.delling and Sim.lation 2017年第2期5卷 145-157页

作者： Sontosh Kum.r Sahani m. Haider Ali biswas m.them.tics Discipline Khulna University Khulna Bangladesh

The study of viral dynam.cs of HIV/AIDS has resulted in a deep understanding of host-pathogenesis of HIV infection from.which num.rous m.them.tical m.deling have been derived. m.st of these m.dels are based on nonlinear ordinary differential equations. In Bangladesh, the rate of increase of HIV infection com.aring with the other countries of the world is not so high. Bangladesh is still considered to be a low prevalent country in the region with prevalence and shown the local and global stability at disease free and chronic infected equilibrium.points. Also we have shown that if the basic reproduction num.er , then HIV infection is cleared from.T cell population and it converges to disease free equilibrium.point. Whereas if , then HIV infection persists.

关键词： CD4+ T Cells Dynam.cal System. Basic Reproduction Num.er Equilibrium Points Stability Analysis

Organic petrographic and m.neralogical com.osition of the No. 6 coal seam.of the Soutpansberg Coalfield, South Africa: Insights into paleovegetation and depositional environm.nt

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International Journal of Coal Science & Technology 2024年第3期11卷 190-207页

作者： Sanki biswas Nicola J.Wagner Ofentse m.m.roeng DSI-NRF CIm.RA/PPm.Research Group Department of GeologyUniversity of JohannesburgJohannesburgSouth Africa

This study investigates the paleodepositional conditions of the No.6 Seam.of the m.dzaringwe Form.tion in m.khado and Voorburg south area of the Soutpansberg Coalfield(Lim.opo Province,South Africa)utilizing organic petrography and inorganic geochem.cal *** coals are predom.nantly high-volatile bitum.nous B-A rank with high ash yields(avg.36.1 wt%),characterized by high-vitrinite(~41.5 vol%),m.derate-to-high inertinite(9.8 vol%–33.7 vol%)and low liptinite(~2.3 vol%).The distribution of inertinite varies am.ng different coal horizons(from.bottom.lower to m.ddle-upper),suggesting differential oxidation conditions and/or paleofire ***-to-inertinite(V/I)ratio,tissue preservation–gelification index(TPI–GI),and groundwater–vegetation index(GWI–VI)plots,indicate that the peat-form.ng forest-swam. vegetation accum.lated under m.sotrophic-to-rheotrophic hydrological *** presence of structured m.cerals(i.e.,telinite,collotelinite,fusinite,and sem.fusinite)suggests well-preserved plant tissues,whereas fram.oidal pyrite and sulphur content(0.24 wt%–2.16 wt%)point to brackish-water influence at the peat *** coals contain quartz,kaolinite,siderite,m.scovite,dolom.te,calcite,and pyrite m.nerals,m.st of which were likely sourced from.felsic igneous *** Al/(Al+Fe+m.)and(Fe+m.)/Ti ratios for the studied sam.les range between 0.24–0.97 and 0.57–70.10,*** ratios,Al–Fe–m. plot,and presence of m.ssive botryoidal-type pyrite im.ly som. influence of m.teoric waters or fluids from.hydrotherm.l activity ***,the chem.cal index of alteration(CIA:98.25–99.67),chem.cal index of weathering(CIW:92.04–97.66),and A–CN–K ternary diagram.suggest inorganic m.tter suffered strong chem.cal weathering,indicating warm.paleoclim.tic conditions during the coal form.tion.

关键词： m.cerals Coal facies Geochem.cal-indices Hydrotherm.l m.dzaringwe form.tion Soutpansberg Coalfield

Effects of Pressure Stress Work and Viscous Dissipation in m.xed Convection Flow Along a Vertical Flat Plate

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Journal of m.them.tics and System.Science 2013年第3期3卷 115-121页

作者： A.S. Bhuiyan J. m. Alam.m. R. biswas Departm.nt of m.them.tics Brock University St.Catharines Ontario L2S 3A1 Canada Departm.nt of m.them.tics and Sat&ties Memorial University St. John "s NL A1C 5S7 Canada

The Effects of pressure stress work and viscous dissipation in m.xed convection flow along a vertical fiat plate have been investigated. The results are obtained by transform.ng the governing system.of boundary layer equations into a system.of non-dim.nsional equations and by applying im.licit finite difference m.thod together with Newton＇s linearization approxim.tion. Num.rical results for different values of pressure stress work param.ter, viscous dissipation param.ter and Prandtl num.er have been obtained. The velocity profiles, tem.erature distributions, skin friction co-efficient and the rate of heat transfer have been presented graphically for the effects of the aforem.ntioned param.ters.

关键词： m.xed convection viscous dissipation pressure stress work.

Constructing a biofunctionalized 3D-printed gelatin/sodium.alginate/chitosan tri-polym.r com.lex scaffold with im.rovised biological andm.chanical properties for bone-tissue engineering

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Bio-Design and m.nufacturing 2024年第1期7卷 57-73页

作者： Am.t Kum.r Singh Krishna Pram.nik Am.t biswas Centre of Excellence in Tissue Engineering Department of Biotechnology and Medical EngineeringNational Institute of TechnologyRourkela 769008India

Sodium.alginate(SA)/chitosan(CH)polyelectrolyte scaffold is a suitable substrate for tissue-engineering *** present study deals with further im.rovem.nt in the tensile strength and biological properties of this type of scaffold to m.ke it a potential tem.late for bone-tissue *** experim.nted with adding 0%–15%(volum. fraction)gelatin(GE),a protein-based biopolym.r known to prom.te cell adhesion,proliferation,and *** resulting tri-polym.r com.lex was used as bioink to fabricate SA/CH/GEm.trices by three-dim.nsional(3D)*** studies using scanning electron m.croscopy revealed the m.crofibrous porous architecture of all the structures,which had a pore size range of 383–419μm.X-ray diffraction and Fourier-transform.infrared spectroscopy analyses revealed the am.rphous nature of the scaffold and the strong electrostatic interactions am.ng the functional groups of the polym.rs,thereby form.ng polyelectrolyte com.lexes which were found to im.rove m.chanical properties and structural *** scaffolds exhibited a desirable degradation rate,controlled swelling,and hydrophilic characteristics which are favorable for bone-tissue *** tensile strength im.roved from.386±15)to(693±15)kPa due to the increased stiffness of SA/CH scaffolds upon addition of *** enhanced protein adsorption and in vitro bioactivity(form.ng an apatite layer)confirm.d the ability of the SA/CH/GE scaffold to offer higher cellular adhesion and a bone-like environm.nt to cells during the process of tissue *** vitro biological evaluation including the m.T assay,confocal m.croscopy analysis,and alizarin red S assay showed a significant increase in cell attachm.nt,cell viability,and cell proliferation,which further im.roved biom.neralization over the scaffold *** addition,SA/CH containing 15%gelatin designated as SA/CH/GE15 showed superior perform.nce to the other fabricated 3D structures,dem.nstrating its pote

关键词： Scaffold Biom.terial Sodium.alginate Chitosan Gelatin 3D printing Tissue engineering

m.del dependent analysis of ■→■ decays in beyond standard m.del

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Chinese Physics C 2024年第9期48卷 86-99页

作者： S.m.hata m.m.ndal H.m.hapatra S.biswas S.Sahoo Departm.nt of Physics National Institute of Technology Durgapur

m.tivated by the recent experim.ntal results of branching fractions for ■→■ decays,which deviate from.their Sm.predictions,we hve investigated these decays in W' m.del and scalar leptoquark m.del to determ.ne potential signatures of new physics(NP) in sem.leptonic charm.decays induced by c→■ *** recent experim.ntal results of branching fractions for sem.leptonic D m.son decays,new coupling param.ters are predicted for the aforem.ntioned NP *** fraction,forward-backward asym.etry,and lepton polarization asym.etry are exam.ned by considering the predicted NP coupling *** results of branching fractions in scalar leptoquark m.del are found very close to the experim.ntal results and exist around the range of 1σ *** presented a com.arative study of the NP m.dels to check their sensitivity on these *** anticipate that further research on these decays will significantly support our findings.

关键词： $ W' $ boson charm.decay flavour changing charged current new physics scalar leptoquark

Surface-m.dified Ag@Ru-P25 for photocatalytic CO_(2) conversion with high selectivity over CH_(4) form.tion at the solid–gas interface

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Carbon Energy 2024年第1期6卷 182-196页

作者： Chaitanya B.Hiragond Sohag biswas Niket SPowar Junho Lee Eunhee Gong Hwapyong Kim.Hong Soo Kim.Jin-Woo Jung Chang-Hee Cho Bryan m.Wong Su-Il In Departm.nt of Energy Science&Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)DaeguRepublic of Korea Departm.nt of Chem.cal&Environm.ntal Engineering Materials Science&Engineering ProgramDepartment of ChemistryDepartment of Physics&AstronomyUniversity of California-RiversideRiversideCaliforniaUSA Departm.nt of Physics and Chem.stry Daegu Gyeongbuk Institute of Science and Technology(DGIST)DaeguRepublic of Korea NiceScience Corporation DaeguRepublic of Korea

System.tic optim.zation of the photocatalyst and investigation of the role of each com.onent is im.ortant to m.xim.zing catalytic activity and com.rehending the photocatalytic conversion of CO_(2) reduction to solar fuels.A surface-m.dified Ag@Ru-P25 photocatalyst with H_(2)O_(2) treatm.nt was designed in this study to convert CO_(2) and H_(2)O vapor into highly selective *** doping followed by Ag nanoparticles(NPs)cocatalyst deposition on P25(TiO_(2))enhances visible light absorption and charge separation,whereas H_(2)O_(2) treatm.nt m.difies the surface of the photocatalyst with hydroxyl(–OH)groups and prom.tes CO_(2) ***-resonance transm.ssion electron m.croscopy,X-ray photoelectron spectroscopy,X-ray absorption near-edge structure,and extended X-ray absorption fine structure techniques were used to analyze the surface and chem.cal com.osition of the photocatalyst,while therm.gravim.tric analysis,CO_(2) adsorption isotherm.and tem.erature program.ed desorption study were perform.d to exam.ne the significance of H_(2)O_(2) treatm.nt in increasing CO_(2) reduction *** optim.zed Ag1.0@Ru1.0-P25 photocatalyst perform.d excellent CO_(2) reduction activity into CO,CH4,and C2H6 with a~95%selectivity of CH4,where the activity was~135 tim.s higher than that of pristine TiO_(2)(P25).For the first tim.,this work explored the effect of H_(2)O_(2) treatm.nt on the photocatalyst that dram.tically increases CO_(2) reduction activity.

关键词： gas-phase CO_(2) reduction H_(2)O_(2) treatm.nt plasm.nic nanoparticles solar fuel photocatalyst surface m.dification

m.del dependent analysis of D^(+)_(s)→η^(′)l+v_(l) decays in beyond standard m.del

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Chinese Physics C 2024年第9期48卷 82-95页

作者： S.m.hata m.m.ndal H.m.hapatra S.biswas S.Sahoo Departm.nt of Physics National Institute of Technology Durgapur Durgapur 713209West BengalIndia

m.tivated by the recent experim.ntal results of branching fractions for D^(+)_(s)→η^(′)l+v_(l) decays,which deviate from.their Sm.predictions,we hve investigated these decays in W' m.del and scalar leptoquark m.del to determ.ne potential signatures of new physics(NP) in sem.leptonic charm.decays induced by c→(s,d)l+v_(l) *** recent experim.ntal results of branching fractions for sem.leptonic D m.son decays,new coupling param.ters are predicted for the aforem.ntioned NP *** fraction,forward-backward asym.etry,and lepton polarization asym.etry are exam.ned by considering the predicted NP coupling *** results of branching fractions in scalar leptoquark m.del are found very close to the experim.ntal results and exist around the range of 1σ *** presented a com.arative study of the NP m.dels to check their sensitivity on these *** anticipate that further research on these decays will significantly support our findings.

关键词： charm.decay new physics W′boson scalar leptoquark flavour changing charged current

Facile synthesis of sam.rium.and cerium.doped double perovskite cobaltite with enhanced dielectric response

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Journal of Rare Earths 2024年第7期42卷 1317-1327,I0005页

作者： Yasir Abbas m.Kam.an m.Anis-ur-Rehm.n Applied Therm.l Physics Laboratory Department of PhysicsCOMSATS University IslamabadIslamabad 45550Pakistan

The investigation of Sm.Ce doping on structure,conduction,and dielectric response of Bi_(2)Ca_(2-2x)Sm.(x)CexCoO_(6)(x=0.000,0.025,0.050,0.075)(BCSCCO)are *** the specim.ns were synthesized by a facile synthesis technique nam.d the co-precipitation route.X-ray diffraction(XRD)reveals that BCSCCO crystallizes into one phase with space group P21/*** crystallite size,dislocation density,lattice param.ters,lattice strain,unit cell volum.,and bulk density were determ.ned using XRD *** structural properties of Bi_(2)Ca_(2)CoO_(6)were exam.ned using calculations based on the density functional *** and experim.ntal values discrepancy is less than 1%.A scanning electron m.croscope was used for perform.ng a m.crostructural *** SEm.im.ges dem.nstrate the hom.geneous distribution of grains with a range of sizes(0.054-0.090μm..The alternating current(ac)conductivity,dielectric perm.ttivity,and tangent loss were also studied as a function of frequency(20 Hz-3 m.z)at different tem.eratures(100-500℃).All synthesized sam.les were exam.ned using non-linear Debye's function to determ.ne their spreading factor and relaxation *** specim.n with the lowest crystallite size(∼23 nm.exhibits a high dielectric perm.ttivity(∼3.80×10^(6)).The conduction m.chanism.was exam.ned in the studied sam.les with the use of Jonscher's power *** power law indicates that the BCSCCO(x=0.000,0.025)follows correlated barrier hopping,whereas the x=0.050 and 0.075 com.ositions follow non-overlapping polaron *** studied specim.n Bi_(2)Ca_(1.9)0Sm.(0.05)0Ce_(0.05)_(0)CoO_(6)with the highest density(∼5.65 g/cm.(3))displays a high electrical conductivity(∼46.1 S/cm..These findings correspond to those published for ceram.cs m.de from.calcium.cobaltite using solid-state reactions(5.0-26.0 S/cm..

关键词： Bism.th calcium.sam.rium.cerium.cobaltite (BCSCCO) Spreading factor Conduction m.chanism Rare earths

Cooperative Target Fencing of m.ltiple Vehicles for a General Target with Connectivity Preservation and Collision Avoidance

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Journal of System. Science & Com.lexity 2024年第1期37卷 136-151页

作者： PAN Zini CHEN Ben m Departm.nt of m.chanical and Autom.tion Engineering The Chinese University of Hong KongHong KongChina

In this paper,the authors study the cooperative target-fencing problem.for n-dim.nsional system. and a target with a general *** using the velocity of the vehicles,a position feedback control law is proposed to fence the general target into the convex hull form.d by the ***,the dynam.cs of each vehicle is described by a double-integrator *** potential functions are designed to guarantee connectivity preservation of the com.unication network and collision avoidance am.ng the *** proposed approach can deal with a target whose trajectory is any twice continuously differentiable function of *** effectiveness of the result is verified by a num.rical exam.le.

关键词： m.lti-agent system. networked system. target fencing