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Combined effects of Joule heating and nonuniform heat source/sink on unsteady MHD mixed convective flow over a vertical stretching surface embedded in a Darcy-Forchheimer porous medium

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Propulsion and Power Research 2022年第2期11卷 276-292页

作者： b.k.sharma Rishu Gandhi Department of Mathematics Birla Institute of Technology and SciencePilani333031RajasthanIndia

This paper deals with an unsteady magnetohydrodynamics(MHD)heat and masstransfer for a viscous incompressible fluid through a vertical stretching surface embedded ina Darcy-Forchheimer porous medium in the presence of a non-uniform heat source/sink andfirst-order chemical *** porous surface is subjected to a uniform transverse *** influence of velocity,thermal,and concentration slip is also *** governing equations are coupled non-linear partial differential equations,which have been converted via similarity transformation into a set of ordinary differential *** resultantsystem of non-linear ordinary differential equations has been solved numerically with the helpof the“MATLAb”bVP4C *** are presented graphically to analyze the effects ofvarious physical parameters discovered in the problem such as Hartmann number(M),Forchheimer number(Fr),Grashof number(Gr),solutal Grashof number(Gc),suction parameter(S),porosity parameter(el),dimensionless velocity slip(Sv),Prandtl number(Pr),dimensionless thermal slip(St),space-dependent heat source/sink parameter(eA1),temperature-dependent heat source/sink(eb)1),Eckert number(Ec),Schmidt number(Sc),chemical reaction parameter(g),unsteadiness parameter(A),and dimensionless concentration slip(Sc)on non-dimensionalvelocity ec0ðhÞ,temperature zðhÞ,and concentration efðhÞ*** influence of these parameters on skin-friction coefficient(C)f),Nusselt number(Nu)x),and Sherwood number(Sh)x)areexpressed in tabular *** is observed that an enhancement in Fr and el results in the declination of the velocity *** is an enhancement in temperature with an increment in theeA)1 and eb)*** physical representation of flow characteristics that appeared in the problem ispresented using various graphs to depict real-world applications in industrial and *** results were compared to previous studies,revealing that the two are in *** nov

关键词： Magnetohydrodynamics(MHD) Unsteady Heat and mass transfer Non-Darcian porous medium Heat source Joule effect

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Microstructures of co-axially folded vein segments and crenulation cleavage： Evidence for dissolution phenomena in the Chamba Thrust Sheet, western Himalayas

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Episodes 2004年第2期27卷 119-124页

作者： b.k.sharma A.M.bhola DepartmentofGeology UniversityofDelhiDelhi-110007India.

The metasediments in the Chamba region experienced three phases of deformation: DF1, DF2 and *** quartz veins are co-folded with the F2 crenulation folds. Their geometric and tectonic significance is studied by microstructures and shortening adjacent to the discrete crenulation cleavage, S2. Microstructures of folded vein segments, their geometric changes and truncation to cleavage (S2) are mainly due to pressure-solution phenomena and the estimated volume loss from reconstructed vein segments range from 16 to 25.5%,which is closely related to volume decrease (26%) calculated from the polydeformed slates of North Wales areas.

关键词：显微结构变质沉积物地质学石英纹理

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Magnetohydrodynamics hemodynamics hybrid nanofluid flow through inclined stenotic artery

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Applied Mathematics and Mechanics(English Edition) 2023年第3期44卷 459-476页

作者： b.k.sharma R.GANDHI T.AbbAS M.M.bHATTI Department of Mathematics Birla Institute of Technology and SciencePilani 333031India Department of Mathematics Division of Science and TechnologyUniversity of EducationLahore 54770Pakistan College of Mathematics and Systems Science Shandong University of Science and TechnologyQingdao 266590Shandong ProvinceChina

The present study aims to perform computational simulations of twodimensional(2D)hemodynamics of unsteady blood flow via an inclined overlapping stenosed artery employing the Casson fluid model to discuss the hemorheological properties in the arterial region.A uniform magnetic field is applied to the blood flow in the radial direction as the magneto-hemodynamics effect is *** entropy generation is discussed using the second law of *** influence of different shape parameters is explored,which are assumed to have varied shapes(spherical,brick,cylindrical,platelet,and blade).The Crank-Nicolson scheme solves the equations and boundary conditions governing the *** a given critical height of the stenosis,the key hemodynamic variables such as velocity,wall shear stress(WSS),temperature,flow rate,and heat transfer coefficient are computed.

关键词： overlapping stenosis hematocrit-dependent viscosity Au-Cu/blood hybrid nanofluid entropy generation shape effect

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Mathematical model of micropolar fluid in two-phase immiscible fluid flow through porous channel

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Applied Mathematics and Mechanics(English Edition) 2018年第7期39卷 993-1006页

作者： P.k.YADAV S.JAISWAL b.D.sharma Department of Mathematics Motilal Nehru National Institute of Technology Allahabad

This paper is concerned with the flow of two immiscible fluids through a porous horizontal channel. The fluid in the upper region is the micropolar fluid/the Eringen fluid, and the fluid in the lower region is the Newtonian viscous fluid. The flow is driven by a constant pressure gradient. The presence of micropolar fluids introduces additional rotational parameters. Also, the porous material considered in both regions has two different permeabilities. A direct method is used to obtain the analytical solu- tion of the concerned problem. In the present problem, the effects of the couple stress, the micropolarity parameter, the viscosity ratio, and the permeability on the velocity profile and the microrotational velocity are discussed. It is found that all the physical parameters play an important role in controlling the translational velocity profile and the microrotational velocity. In addition, numerical values of the different flow parameters are computed. The effects of the different flow parameters on the flow rate and the wall shear stress are also discussed graphically.

关键词： micropolar fluid immiscible fluid porous medium couple stress microp=olarity parameter

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bRUCk FORMULA FOR A PERTURbED LIPSCHITZIAN ITERATION OF LIPSCHITZ PSEUDOCONTRACTIVE MAPS

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Applied Mathematics and Mechanics(English Edition) 2005年第11期26卷 1427-1434页

作者： krishna kumar b. k. sharma ZHOU Zhe-wei School of Studies in Mathematics Pt. Ravishankar Shukla University Raipur Chhattisgarh-492010 India 不详

The solution to evolution equations has developed an independent theory within nonlinear analysis dealing with the existence and approximation of such solution （ fixed point） of pseudocontractive operators and its variants. The object is to introduce a perturbed iteration method for proving the convergence of sequence of Lipschitzian pseudocontractive mapping using approximate fixed point technique. This iteration can be ued for nonlinear operators which are more general than Lipschitzian pseudocontractive operator and bruck iteration fails for proving their convergence. Our results generalize the results of Chidume and Zegeye.

关键词： pseudocontractive map perturbed Lipschitzian iteration fixed point uniformaly Gateaux differential norm

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Study of a collisionless magnetized plasma sheath with nonextensively distributed species

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Plasma Science and Technology 2023年第12期25卷 14-23页

作者： R PAUL k DEkA G sharma R MOULICk S ADHIkARI S S kAUSIk b k SAIkIA Centre of Plasma Physics Institute for Plasma ResearchAssam 782402India Institute for Energy Technology Instituttveien 8Kjeller 2007Norway

A weakly magnetized sheath for a collisionless, electronegative plasma comprising positive ions,electrons, and negative ions is investigated numerically using the fluid approach. The electrons are considered to be non-Maxwellian in nature and are described by Tsalli's distribution. Such electrons have a substantial effect on the sheath properties. The study also reveals that non-Maxwellian distribution is the most realistic description for negative ions in the presence of an oblique magnetic field. In addition to the negative ion temperature, the sheath potential is also affected by the nonextensive parameters. The present research finds application in the plasma processing and semiconductor industry as well as in space plasmas.

关键词： magnetised plasma sheath electronegative plasma non-extensive distribution

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Tree regeneration in gap-understory mosaics in a subtropical Shorea robusta(Sal) forest

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Journal of Forestry Research 2019年第6期30卷 2061-2068页

作者： L.N.sharma k.b.Shrestha I.E.Maren Forest Action Nepal GPO-12207 LalitpurNepal Department of biological Sciences University of BergenThormoensgate 53B5007 BergenNorway

Spatial variation in tree-regeneration density is attributed to the specialization of tree species to light availability for germination and *** availability,in turn,varies across the gap-understorey *** gaps provide an important habitat for the regeneration of tree species that would otherwise be suppressed in the *** subtropical forests,there is still a knowledge-gap relating to how canopy disturbances influence tree-regeneration patterns at local scale,and if they disproportionately favor regeneration of certain *** aim to analyze whether canopy gaps promote tree regeneration,and tree species are specialized to gaps or understory for germination and *** sampled vegetation in 128 plots(0.01 ha),equally distributed in gaps and below canopy,in two subtropical Shorea robusta Gaertn.(Sal)forests in Nepal,recording the number of tree seedlings and saplings in each *** compared the regeneration density of seedlings and saplings separately between gaps and the *** mean densities of seedlings and saplings were higher in the gaps at both sites;although there was no difference in the seedling density of the majority of the species between the *** species were confined to either gap or understorey at the seedling *** conclude that gaps are not critical for the germination of tree species in Sal forests but these are an important habitat for enabling seedlings to survive into *** classification of trees into regeneration guilds mainly based on germination does not apply to the majority of tree species in subtropical Sal *** results reaffirm that gap creation promotes tree regeneration by favouring seedling survival and growth and can influence forest management for conservation,as well as for plantations.

关键词： Canopy-gap Density Regeneration Saplings Seedlings Shade tolerance

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Ce-Co-doped biFeO_3 multiferroic for optoelectronic and photovoltaic applications

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Chinese Physics b 2017年第11期26卷 383-388页

作者： Jyoti sharma Deepak basandrai A k Srivastava Department of Physics Lovely Professional University

The Ce-Co-doped biFeO3 multiferroic, bi（1-x）Ce）xFe（1-x）CoxO3（x = 0.00, 0.01, 0.03, and 0.05）, has been prepared by a sol-gel auto-combustion method and analyzed through Raman spectroscopy, photoluminescence, and UV-visible spectroscopy. We have observed an anomalous intensity of the second-order Raman mode at - 1260 cm^-1 in pure bFO and suppressed intensity in doped samples, which indicates the presence of spin two-phonon coupling in these *** photoluminescence spectra show reduction in the intensity of emission with the increasing dopant concentration, which indicates the high charge separation efficiency. A sharp absorption with three charge transfer（C-T） and two d-d transitions are shown by UV-visible spectra in the visible region. The band gap of biFeO3（bFO） is decreasing with increasing dopant concentrations and the materials are suitable for photovoltaic applications.

关键词： Raman and UV-visible spectroscopy photoluminescence and photo-voltaic applications

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View Creation for Queriesin Object Oriented Databases

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Journal of Computer Science & Technology 1999年第4期14卷 349-362页

作者： RajeshNarang k.D.sharma DepartmentofComputerScience UniversityofDelhiDelhi110007，I DepartmentofComputerScience Universityof

A view in object oriented databases corresponds to virtual schemawith restructured generalization and decomposition hierarchies. Numbers of viewcreation methodologies have been proposed. A major drawback of existing method-ologies is that they do not maintain the closure property. That is, the result of aquery does not have the same semantics as embodied in the object oriented datamodel. Therefore, this paper presents a view creation methodology that derives aclass in response to a user's query, integrates derived class in global schema (i.e.,considers the problem of classes moving in class hierarchy) and selects the requiredclasses from global schema to create the view for user's query. Novel idea of viewcreation includes: (a) an object algebra for class derivation and customization (wherethe derived classes in terms of object instances and procedure/methods are studied),(b) maintenance of closure property, and (c) classification algorithm which providesmechanism to deal with the problem of a class moving in a class hierarchy.

关键词： object manipulation type level operation instance level operation,object algebra object operator operator syntax operator semantics derived class,class integration view creation algorithm

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Characterization of bi2/3Cu3Ti4O12 ceramics synthesized by semi-wet route

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Progress in Natural Science:Materials International 2016年第6期26卷 567-571页

作者： Pooja Gautam Ankur khare Sunita sharma N.b.Singh k.D.Mandal Department of Chemistry Indian Institute of Technology(BHU) Department of Chemistry & biochemistry University of Maryland

bi2/3Cu3Ti4O12（bCTO） ceramic was synthesized by the semi-wet route using metal nitrate solutions and solid TiO2powder in a stoichiometric ratio. Fourier transform infrared（FTIR） study of bCTO precursor powder and calcined ceramic showed the presence of alcoholic functional groups and the stretching band of Ti-O and Cu-O respectively. X-ray diffraction（XRD）, scanning electron microscope（SEM） and energy dispersive x-ray spectroscopy（EDX） were employed to characterize the structure, surface morphology and purity of the sintered bCTO ceramic respectively. X-ray diffraction study confirmed the single phase formation of bCTO ceramic at1073 k. The average dimension of grains calculated by SEM and AFM was found to be in the range of 0.73 ±0.2 μm with clear grain boundaries. Magnetic property was investigated over a wide temperature range 2–300 k at a magnetic field of 7 tesla. The Curie temperature was calculated by zero field cooled(MZFC) and field cooled(MFC) magnetization at 100 Oe applied field which was found to be 125 k. The sintered bCTO ceramic shows high dielectric constant（ε'=2.9×10～4） at 323 k and 100 Hz.

关键词： Ceramic Synthesis Structural properties Magnetic properties

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