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Global Dynamics of a Multi-group sEIR Epidemic Model with Infection Age

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Chinese Annals of Mathematics,series B 2021年第6期42卷 833-860页

作者： vijay Pal BAJIYA Jai Prakash tripathi Vipul KAKKAR Jinshan WANG Guiquan sUN Department of Mathematics Central University of RajasthanBandar Sindri-305817KishangarhAjmerRajasthanIndia Complex systems Research Center Shanxi UniversityTaiyuan 030006China Department of Mathematics North University of ChinaTaiyuan 030051China Complex systems Research Center Shanxi UniversityTaiyuan 030006China.

Consider the heterogeneity(e.g.,heterogeneous social behaviour,heterogeneity due to different geography,contrasting contact patterns and different numbers of sexual partners etc.)of host population,in this paper,the authors propose an infection age multigroup sEIR epidemic *** model system also incorporates the feedback variables,where the infectivity of infected individuals may depend on the infection *** the direction of mathematical analysis of model,the basic reproduction number R_0 has been *** global stability of disease-free equilibrium and endemic equilibrium have been established in the term of R_(0).More precisely,for R_(0)≤1,the disease-free equilibrium is globally asymptotically stable and for R_(0)>1,they establish global stability of endemic equilibrium using some graph theoretic techniques to Lyapunov function *** considering a numerical example,they investigate the effects of infection age and feedback on the prevalence of the *** result shows that feedback parameters have different and even opposite effects on different ***,by choosing an appropriate value of feedback parameters,the disease could be eradicated or maintained at endemic ***,the infection age of infected individuals may also change the behaviour of the disease,global stable to damped oscillations or damped oscillations to global stable.

关键词： Multi-group model Infection age Feedback Graph-theoretic approach Lyapunov function

Thermally and Optical-Induced Effect on Optical and Electrical Parameters of Ag-Doped Cdse Thin Films

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Acta Metallurgica sinica(English Letters) 2015年第5期28卷 591-599页

作者： Jagdish Kaur s.K.tripathi Department of Physics Panjab University

Thin films of Ag-doped Cdse are deposited on the glass substrates by thermal evaporation technique using inert gas condensation method. The elemental composition of the prepared thin film is confirmed by EDX spectra. sEM analysis reveals the uniform distribution of the grains over the substrate. TEM analysis reveals the spherical nature of nanoparticles having size in the range of 25-30 nm. X-ray diffraction study indicates an increase in the grain size after thermal annealing and the decrease in the grain size after light soaking treatment. Transmittance spectra are found to decrease with corre- sponding red shift after annealing and light soaking of as-deposited thin films. The value of the band gap is found to decreases and refractive index increases, after annealing and light soaking treatment. The dispersion of refractive index is described using the Wemple-DiDomenico single oscillator model and the effects of the annealing and the light soaking on the dispersion parameters are studied. The dark conductivity is found to change from 2.24 × 10^-8 to 1.54 × 10^-7 and 1.45 ×10^-9 Ω-1 cm-1 after annealing and light soaking of thin films, respectively. Hall effect measurement reveals n-type behavior of as-deposited, annealed and light-soaked thin films.

关键词： Cdse Thin film surface treatment Electrical properties

Recent progress in in vivo studies and clinical applications of magnesium based biodegradable implants–A review

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Journal of Magnesium and Alloys 2021年第4期9卷 1149-1166页

作者： Prithivirajan sekar Narendranath s vijay Desai Corrosion Engineering Lab Department of Mechanical EngineeringNational Institute of Technology KarnatakaSurathkalSrinivasanagarMangalore 575025KarnatakaIndia

Biodegradable magnesium has regained great attention due to its ability to temporarily offer mechanical strength and degrade completely once the injured pathological tissue is healed.A few clinical applications of Mg-based implants were reported in the last ***,the knowledge and experience is being gained continuously by studying the host response and degradation behavior of Mg implant in animal models and clinical *** led to the development of commercial products emerging from Europe and Asia very *** potential of Mg implants in repairing fractures at upper and lower limb of large,small animal models and humans is compared and discussed in *** addition the possible future Mg implants that might treat problems concerning to urology and gynecology are reviewed.

关键词： Biodegradable Magnesium Fracture healing Translational medicine Clinical trials

A novel slot scheduling technique for duty-cycle based data transmission for wireless sensor network

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Digital Communications and Networks 2022年第3期8卷 351-358页

作者： Yogesh tripathi Arun Prakash Rajeev tripathi Department of Electronics and Communication Engineering Motilal Nehru National Institute of Technology AllahabadPrayagraj211004India

The duty cycling process involves turning a radio into an active and dormant state for conserving energy. It is a promising approach for designing routing protocols for a resource-constrained Wireless sensor Networks (WsNs). In the duty cycle-based WsNs, the network lifetime is improved and the network transmission is increased as compared to conventional routing protocols. In this study, the active period of the duty cycle is divided into slots that can minimize the idle listening problem. The slot scheduling technique helps determine the most efficient node that uses the active period. The proposed routing protocol uses the opportunistic concept to minimize the sender waiting problem. Therefore, the forwarder set will be selected according to the node's residual active time and energy. Further, the optimum routing path is selected to achieve the minimum forwarding delay from the source to the destination. simulation analysis reveals that the proposed routing scheme outperforms existing schemes in terms of the average transmission delay, energy consumption, and network throughput.

关键词： Duty cycle Energy model Wireless sensor network slot scheduling technique

silver Dopant-Induced Effect on structural and Optoelectronic Properties of Cdse Thin Films

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Acta Metallurgica sinica(English Letters) 2019年第5期32卷 541-549页

作者： Jagdish Kaur Ramneek Kaur s.K.tripathi PG Department of Physics DAV College Department of Physics Akal University Department of Physics Panjab University

Thin films of Cdse and silver(Ag)-doped Cdse have been prepared on glass substrates by thermal evaporation in argon gas atmosphere. X-ray diffraction pattern indicates the presence of hexagonal structure with preferred orientation along (100) plane. Elemental composition of the thin films has been analyzed using energy dispersive X-ray analysis. scanning electron microscopy has been used to investigate the morphology of the thin films. Transmission electron microscope reveals spherical nature of nanoparticles. A decrease in the band gap due to the formation of band tails in the band gap with increase in Ag doping in Cdse lattice has been observed. Photoluminescence spectra indicate redshift in band edge emission peak with increase in Ag doping in Cdse. Electrical conductivity measurements are also studied, and two types of conduction mechanisms taking part in the transport phenomena are observed. Hall measurements indicate n-type behavior of undoped and Ag-doped Cdse thin films.

关键词： semiconductors Thin films Vapor deposition Electron microscopy Electrical properties

A Mathematical study on Three Layered Oscillatory Blood Flow Through stenosed Arteries

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Journal of Bionic Engineering 2012年第1期9卷 119-131页

作者： Dharmendra tripathi Department of Mathematics Indian Institute of Technology Ropar Punjab-140001 India

A mathematical model is constructed to examine the characteristics of three layered blood flow through the oscillatory cylindrical tube （stenosed arteries）. The proposed model basically consists three layers of blood （viscous fluids with different viscosities） named as core layer （red blood cells）, intermediate layer （platelets/white blood cells） and peripheral layer （plasma）. The analysis was restricted to propagation of small-amplitude harmonic waves, generated due to blood flow whose wave length is larger compared to the radius of the arterial segment. The impacts of viscosity of fluid in peripheral layer and intermediate layer on the interfaces, average flow rate, mechanical efficiency, trapping and reflux are discussed with the help of numerical and computational results. This model is the generalized form of the preceding models. On the basis of present discussion, it is found that the size of intermediate and peripheral layers reduces in expanded region and enhances in contracted region with the increasing viscosity of fluid in peripheral layer, whereas, opposite effect is observed for viscosity of fluid in intermediate layer. Final conclusion is that the average flow rate and mechanical efficiency increase with the increasing viscosity of fluid in both layers, however, the effects of the viscosity of fluid in both layers on trapping and reflux are opposite to each other.

关键词： mathematical model three layered oscillatory blood flow stenosed arteries mechanical efficiency trapping reflux

Methyl-salicylate:A surveillance system fortriggering immunity in neighboring plants

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Journal of Integrative Plant Biology 2024年第2期66卷 163-165页

作者： saumya Jaiswal Durgesh Kumar tripathi Ravi Gupta JingHe Zhong-Hua Chen vijay Pratap singh Plant Physiology Laboratory Department of Botany C.M.P.Degree CollegeA Constituent Post Graduate College ofUniversity of AllahabadPrayagraj 211002India Crop Nanobiology and Molecular stress Physiology LabAmity Institute of Organic Agriculture Amity University UttarPradeshNoida 201313India College of General Education Kookmin UniversitySeoul 02707South Korea school of science Western Sydney UniversitySydney 2751New South WalesAustralia Hawkesbury Institute for the Environment Western SydneyUniversitySydney 2751New South WalesAustralia

Plant behavioral actions have been one of the major topicsof research in plant biology and *** actionsfrom plants are determined by their instant structural andphysical reactions to the circumstances(Bouwmeester et al.,2019).Upon sensing abiotic factors such as salinity,flooding,high temperature,drought,plants make suitable changes intheir physiology and behavior to survive such harsh conditions.

关键词： immunity neighboring salinity

comseedling growth of five tropical dry forest tree species in relation to light and nitrogen gradients

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Journal of Plant Ecology 2014年第3期7卷 250-263页

作者： s.N.tripathi A.s.Raghubanshi Ecosystems Analysis Laboratory Department of BotanyBanaras Hindu UniversityVaranasiUttar Pradesh 221005India Deen Dayal Upadhyaya College University of DelhiShivaji MargKarampuraNew Delhi 110015India Institute of Environment and sustainable Development Banaras Hindu UniversityVaranasiUttar Pradesh 221005India

Aims Increasing anthropogenic nitrogen(N)deposition has been claimed to induce changes in species composition and community dynamics.A greenhouse experiment was conducted to examine the effect of increased N availability on growth and functional attributes of seedlings of five tree species with different life history characteristics under varying *** following questions have been addressed:(i)how do the pioneer and non-pioneer species respond in absolute growth and relative growth rate(RGR)to the interaction of light and nitrogen?(ii)how does the interaction between irradiance and nitrogen availability modulate growth attributes(*** attributes)?(iii)is there any variation in growth responses between leguminous and non-leguminous species along the light and nitrogen gradients?Methods seedlings of five tree species(Acacia catechu,Bridelia retusa,Dalbergia sissoo,Lagerstroemia parviflora and Terminalia arjuna)were subjected to twelve combinations of irradiance and N *** growth traits,including height(HT),basal area(BA),whole plant dry biomass(MD),leaf mass per unit area(LMA),leaf area ratio(LAR),net assimilation rate(NAR),RGR,biomass fractions,root-toshoot ratio(R:s)and leaf nitrogen content,were studied to analyse intra-and inter-specific responses to interacting light and N *** Findings significant interactions for irradiance and N availability for majority of growth attributes indicates that growth and biomass allocation of seedlings were more responsive to N availability under high ***,species responded differentially to N addition and they did not follow successional *** growers(***,a shade-tolerant species and ***,a light demander)exhibited greater response to N enrichment than the fast growers(***,*** and ***).However,N-mediated increment in growth traits was greater in non-legumes(***,*** and ***)compared with that of legumes(*** and D

关键词： tropical dry forest irradiance nitrogen biomass allocation relative growth rate net assimilation rate

Analysing the combined effect of crystallographic orientation and grain refinement on mechanical properties and corrosion behaviour of ECAPed ZE41 Mg alloy

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Journal of Magnesium and Alloys 2020年第4期8卷 1128-1143页

作者： s.Prithivirajan s.Narendranath vijay Desai Corrosion Engineering Lab Department of Mechanical EngineeringNational Institute of Technology KarnatakaSurcithkalSrinivasanagarMangalore 575025KarnatakaIndia

Two step equal channel angular pressing carried out on as cast ZE41 Mg alloy resulted in a remarkable grain *** compared to grain size of 46p.m in as cast sample,refinement upto 2.5^01 was achieved after 8th pass equal channel angular pressing(ECAP).The combined effect of crystallographic orientation and grain refinement was investigated by analysing the mechanical properties and corrosion behaviour of ZE41 Mg alloy using electron back scattered diffraction(EBsD).The first stage comprises of 1st,2nd,3rd and 4th passes at a processing temperature of 300℃while the 5th,6th,7th and 8th passes were ECAPed at 275℃in second *** mechanical properties of ZE41 Mg 158 yield tensile strength(YTs),230 ultimate tensile strength(UTs)and 7%elongation in as cast condition is enhanced to 236 YTs,295 UTs and 19.76%,respectively,after first stage *** yield tensile strength deteriorated due to the effect of texture predominating grain refinement during the second stage *** corrosion resistance of ZE41 Mg was significantly enhanced by ECAP and is inferred from electrochemical impedance spectroscopy(EIs)and potentiodynamic polarisation *** role of microstructure was minimal on corrosion behaviour of ZE41 Mg due to extra resistance when tested in 0M ***,the influence of grain refinement greatly influenced the improvement in corrosion resistance of ZE4I Mg rather than crystallographic orientation observed from *** contrast,the crystallographic orientation predominated the effect of grain refinement during ZE41 Mg corrosion in chloride containing(0.1 M and 1 M NaCl)*** the observation of results it is found that equal channel angular pressing has the dual advantage of improving mechanical properties and corrosion resista nee of ZE41 Mg alloy.

关键词： Corrosion EBsD Equal channel angular pressing Magnesium alloy