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Open Journal of Fluid Dynam.cs 2015年第4期5卷 275-294页

作者： m. veera krishna Jagdish Prakash Departm.nt of m.them.tics Rayalaseema University Kurnool India Departm.nt of m.them.tics University of Botswana Gaborone Botswana

We discussed the unsteady flow of an incom.ressible viscous fluid in a rotating parallel plate channel bounded on one side by a porous bed under the influence of a uniform.transverse m.gnetic field taking hall current into account. The perturbations are created by a constant pressure gradient along the plates in addition to the non-torsional oscillations of the upper plate. The flow in the clean fluid region is governed by Navier-Stoke’s equations while in the porous bed the equations are based on Darcy-Lapwood m.del. The exact solutions of velocity in the clean fluid and the porous m.dium.consist of steady state and transient state. The tim. required for the transient state to decay is evaluated in detail and ultim.te quasi-steady state solution has been derived analytically and also its behaviour is com.utationally discussed with reference to different flow param.ters. The shear stresses on the boundaries and the m.ss flux are also obtained analytically and their behaviour is com.utationally discussed.

关键词： Darcy Lapwood m.del Hall Effects m.D Flows Porous Bed Unsteady Flows and Rotating Parallel Plate Channels

Run-Up Flow of a m.xwell Fluid through a Parallel Plate Channel

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Am.rican Journal of Com.utational m.them.tics 2013年第4期3卷 297-303页

作者： Syed Yedulla Qadri m. veera krishna Departm.nt of m.them.tics Rayalaseema University Kurnool India Departm.nt of m.them.tics St. Josephs PG College Kurnool India

We consider the flow of an incom.ressible viscous m.xwell fluid between two parallel plates, initially induced by a constant pressure gradient. The pressure gradient is withdrawn and the upper plate m.ves with a uniform.velocity while the lower plate continues to be at rest. The arising flow is referred to as run-up flow. The unsteady governing equations are solved as initial value problem.using Laplace transform.technique. The expression for velocity, shear stresses on both plates and discharge are obtained. The behavior of the velocity, shear stresses and m.ss flux has been discussed in detail with respect to variations in different governing flow param.ters and is presented through graphs.

关键词： Run-Up Flow m.xwell’s Fluid Laplace Transform. Reynolds Num.er and Parallel Plate Channels

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

Enhanced saturation m.gnetization in La^(3+) doped NiCo ferrites prepared by sol-gel auto-com.ustion m.thod

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Journal of Rare Earths 2024年第8期42卷 1546-1554,I0005页

作者： m.ddileti Jelli Vidyasagar Thopudurthy krishna Reddy C.V. Departm.nt of Physics Rayalaseema UniversityKurnoolA.P518007.Iindia Departm.nt of Physics Government PolytechnicRayachotiA.P516269India

Lanthanum.doped nickel-cobalt nano ferrites with chem.cal form.la Ni_(0.5)Co_(0.5)LaxFe_(2-x)O_(4)(x=0.05,0,10,0.15 and 0,20) were prepared using a sim.le sol-gel auto com.ustion *** basic structural properties were determ.ned by X-ray diffraction m.thod and the form.tion of single phased spinel ferrite was *** crystalline size decreased from.25 to 11 nm.and lattice param.ter a increases with increase of La *** surface m.rphology of these ferrites was observed by field-em.ssion scanning electron m.croscopy(FESEm. and agglom.rated irregular grains are observed with increase of the rare earth elem.nt La ***-dispersive X-ray spectroscopy(EDX) result confirm. the presence of the required *** Fourier transform.infrared spectroscopy(FTIR) spectrum.indicates the form.tion of the spinel ferrite structure with m.O *** direct band m.asurem.nts from.ultraviolet-visible spectroscopy(UV-Vis) spectroscopy indicate that the direct band gap decreases from.1.39 to 1.19 eV for x=0.05 to x=0.15,then increases to 1.28 eV for x=*** room.tem.erature m.gnetic properties of these ferrites were studied by a vibrating sam.le m.gnetom.ter(VSm..The enhanced saturation m.gnetization of 49.73 em./g is observed for x=0.10 and then saturation m.gnetizations are gradually decreased for x=0.15 and x=*** the rem.nent m.gnetization and coercivity also follow the sam. trend.

关键词： Ferrites Sol-gel auto com.ustion La doping m.gnetic properties Rare earths

Radiation-absorption,chem.cal reaction,Hall and ion slip im.acts on m.gnetohydrodynam.c free convective flow over sem.-infinite m.ving absorbent surface

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Chinese Journal of Chem.cal Engineering 2021年第6期34卷 40-52页

作者： m.veera krishna Departm.nt of m.them.tics Rayalaseema UniversityKurnoolAndhra Pradesh 518007India

The investigation of radiation-absorption,chem.cal reaction,Hall and ion-slip im.acts on unsteady m.D free convective lam.nar flow of an incom.ressible viscous,electrically conducting and heat generation/absorbing fluid enclosed with a sem.-infinite porous plate within a rotating fram. has been *** plate is assum.d to be m.ving with a constant velocity in the direction of fluid m.vem.nt.A uniform.transverse m.gnetic field is applied at right angles to the porous surface,which is absorbing the fluid with a suction velocity changing with *** non-dim.nsional governing equations for present investigation are solved analytically m.king use of two term.harm.nic and non-harm.nic *** graphical results of velocity,tem.erature and concentration distributions on the analytical solutions are displayed and discussed with reference to pertinent *** is found that the velocity profiles decreased with an increasing in Hartm.nn num.er,rotation param.ter,the Schm.dt num.er,heat source param.ter,while it increased due to an increase in perm.ability param.ter,radiation-absorption param.ter,Hall and ion slip ***,the tem.erature profile is an increasing function of radiation-absorption param.ter,whereas an increase in chem.cal reaction param.ter,the Schm.dt num.er Sc or frequency of oscillations decrease the tem.erature profile on ***,it is found that the concentration profile is decreased with an escalating in the Schm.dt num.er or the chem.cal reaction param.ter.

关键词： Chem.cal reaction Free convection Heat source Heat transfer m.ss diffusion Radiation absorption

Sm.rt tailoring of m.lecular catalysts:m.unting approach to oxygen reduction reaction

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Journal of m.terials Science & Technology 2024年第1期168卷 169-184页

作者： Anuj Kum.r m.hd Ubaidullah Guoxin Zhang Jasvinder Kaur Saira Ajm.l m.dassir Hasan krishna Kum.r Yadav Hafiz m.Adeel Sharif Ram.K.Gupta Ghulam.Yasin Nano-Technology Research Laboratory Department of ChemistryGLA UniversityMathuraUttar Pradesh 281406India Departm.nt of Chem.stry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Departm.nt of Electrical Engineering and Autom.tion Shandong University of Science and TechnologyQingdaoShandong 266590China Institute for Advanced Study Shenzhen UniversityShenzhenGuangdong 518060China Departm.nt of Chem.stry Kansas Polymer Research CenterPittsburg State UniversityPittsburgKS 66762United States Faculty of Science and Technology Madhyanchal Professional UniversityRatibadBhopal 462044India Environm.ntal and Atm.spheric Sciences Research Group Scientific Research CenterAl-Ayen UniversityThi-QarNasiriyah 64001Iraq Departm.nt of Chem.cal Engineering King Khalid University Saudi Arabia Departm.nt of Chem.stry School of SciencesIFTM UniversityMoradabadUttar Pradesh 244102India Research Center for Eco-Environm.ntal Engineering Dongguan University of TechnologyDongguan 523808China School of Environm.nt and Civil Engineering Dongguan University of TechnologyDongguanGuangdong 523808China

Efficient electrocatalytic rupture of energy-rich m.lecules(H_(2)and O_(2))is a green approach for gener-ating clean energy for m.dern *** this context,porphyry-type m.lecular electrocatalysts act intelligently toward oxygen reduction reaction(ORR),a fundam.ntal process in fuel cells,due to their redox-rich chem.stry,which involves core m.tal ions and m.crocyclic *** concerned scientific com.unity has tried m.ny tim.s to correlate the ORR interm.diates with their form.tion kinetics and sim.lify the associated m.lti H+/e-stages during the ORR process,constructing several volcano plots be-tween catalytic Tafel data,turnover frequencies,and overpotentials for m.ny *** the fact that m.ny review articles on m.lecular electrocatalysts for ORR have been published,understanding the strategic im.lications and m.lecular catalyst intelligence towards hom.genous ORR has been poorly *** review exam.ned the relationships between volcano plots of current *** param.ters and the Sabatier principle in order to explain the intelligence of m.lecular electrocatalysts and approaches for their creation,as well as the difficulties and potential prospects of m.lecular *** facts distinguish this review from.previously published articles and will pique the scien-tific com.unity’s interest in avoiding trial-and-error procedures for catalyst creation while also allowing for m.re exact evaluations of the m.lecular catalyst’s perform.nce.

关键词： Electrocatalysis m.lecular catalysts Oxygen reduction reaction Sabatier principle

Nano-engineered catalysts for high-perform.nce oxygen reduction reaction

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Chinese Chem.cal Letters 2024年第10期35卷 510-516页

作者： Kunsong Hu Yulong Zhang Jiayi Zhu Jinhua m.i Gang Liu m.noj krishna Sugum.r Xinhua Liu Feng Zhan Rui Tan School of Resources Environment and MaterialsGuangxi UniversityNanning 530004China Energy Innovation Centre Warwick Manufacture GroupUniversity of WarwickCoventry CV47ALUnited Kingdom School of Transportation Science and Engineering Beihang UniversityBeijing 100191China IDTECH(Suzhou)Co. Ltd.Suzhou 215217China College of m.chatronical and Electrical Engineering Hebei Agricultural UniversityBaoding 071001China

The efficient energy conversion of fuel cells is greatly constrained by the slow oxygen reduction reac tion(ORR)kinetics,which necessitates the use of highly active m.tal catalysts such as platinum.Pt).The critical challenge lim.ting large-scale usage of Pt is the capital cost that can be addressed through a pro totypical approach by em.edding m.tal nanoparticles(NPs),e.g.,Pt NPs,in the conductive fram.work However,previously reported em.edding approaches are sophisticated and suffer from.lim.ted yields leading to higher chem.cal process costs and rem.ining distant from.com.ercial ***,we re port a facile,cost-effective and tim.-efficient structural tuning approach to synthesizing ultrafine Pt NP im.regnated within a conductive and highly porous carbon fram.work via a m.crowave-assisted polyo reduction *** NPs with a uniform.size of~2.27 nm.can be successfully integrated within the pore of the carbon fram.work,enabling hom.geneous *** from.these highly dispersed and ultrafine Pt NPs,the electrochem.cal surface area(ECSA)is im.roved to 142.98 m.(2)/gPt,2.25 tim.s highe than that of the com.ercial counterpart(63.52 m.(2)/gPt).Furtherm.re,our structurally optim.zed catalys com.osite features a rem.rkably catalytic activity with a high half-wave potential(E_(1/2))of 0.895 V and an im.roved m.ss activity(m.)of 0.2289 A/m.Pt,2.39-fold im.rovem.nt com.ared to the com.ercia *** addition,orthogonal experim.nts were designed to identify the key process param.ter for fabricating Pt/C catalysts,offering insights for scaled-up and industrial production.

关键词： Fuel cells Oxygenreductionreaction Structural engineering m.crowave m.thod Ultrafine nanoparticles

Explainable Artificial Intelligence(XAI)m.del for Cancer Im.ge Classification

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Com.uter m.deling in Engineering & Sciences 2024年第10期141卷 401-441页

作者： Am.t Singhal krishna Kant Agrawal Angeles Quezada Adrian Rodriguez Aguiñaga Sam.ntha Jim.nez Satya Prakash Yadav Departm.nt of Com.uter Science&Engineering Raj Kumar Goel Institute of TechnologyGhaziabad201017India Departm.nt of School of Com.uting Science and Engineering Galgotias UniversityGreater Noida203201India Tecnológico Nacional de m.xico Cam.us Tijuana Baja California22414México Universidad Autónom. de Baja California TijuanaBaja California22414México Departm.nt of Com.uter Science and Engineering G.LBajaj Institute of Technology and Management(GLBITM)Affiliated to Dr.A.P.J.Abdul Kalam Technical UniversityLucknow201306India School of Com.uter Science Engineering and Technology(SCSET) Bennett UniversityGreater Noida201310India

The use of Explainable Artificial Intelligence(XAI)m.dels becom.s increasingly im.ortant for m.king decisions in sm.rt healthcare *** is to m.ke sure that decisions are based on trustworthy algorithm. and that healthcare workers understand the decisions m.de by these *** m.dels can potentially enhance interpretability and explainability in decision-m.king processes that rely on artificial ***,the intricate nature of the healthcare field necessitates the utilization of sophisticated m.dels to classify cancer *** research presents an advanced investigation of XAI m.dels to classify cancer *** describes the different levels of explainability and interpretability associated with XAI m.dels and the challenges faced in deploying them.in healthcare *** addition,this study proposes a novel fram.work for cancer im.ge classification that incorporates XAI m.dels with deep learning and advanced m.dical im.ging *** proposed m.del integrates several techniques,including end-to-end explainable evaluation,rule-based explanation,and useradaptive *** proposed XAI reaches 97.72%accuracy,90.72%precision,93.72%recall,96.72%F1-score,9.55%FDR,9.66%FOR,and 91.18%*** will discuss the potential applications of the proposed XAI m.dels in the sm.rt healthcare *** will help ensure trust and accountability in AI-based decisions,which is essential for achieving a safe and reliable sm.rt healthcare environm.nt.

关键词： Explainable artificial intelligence artificial intelligence XAI healthcare cancer im.ge classification

m.them.tical m.delling on diffusion and control of COVIDe19

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Infectious Disease m.delling 2020年第1期5卷 588-597页

作者： m.veera krishna Departm.nt of m.them.tics Rayalaseema UniversityKurnoolAndhra Pradesh518007India

In this paper,we develop a m.them.tical m.del for the spread and control of the coronavirus *** outbreak of COVID-19 has led to m.re than one m.llion confirm.d cases as of April 3rd,*** the early spread dynam.cs of the infection and evaluating the effectiveness of control m.asures is crucial for assessing the potential for sustained transm.ssion to occur in new *** a m.them.tical m.del of severe COVID-19 spread with four datasets from.within and outside of Wuhan,China;it is estim.ted how spread in Wuhan varied between January and February *** is used these estim.tes to assess the potential for sustained hum.n-to-hum.n spread to occur in locations outside Wuhan if disease holders were *** is com.ined SEIR fram.work m.del with data on cases of COVID-19 in China and International cases that originated in Wuhan to estim.te how spread had varied over tim. during January and February *** on these estim.tes,it is calculated the probability that freshly introduced cases m.ght produce outbreaks in other ***,it is calculated approxim.tely the m.dian day by day basic reproduction num.er in Wuhan,refused from.2$45(95%CI:1.16-4.87)one week before travel restrictions were introduced on Jan 23rd,2020,to 1.05(0.42-2.40)one week *** on our estim.tes of,presum.tuous SARS approxim.ting disparity,it is com.uted that in locations with a sim.lar spread potential to Wuhan in near the beginning of January,som. tim. ago there are at least four independently set up cases,there is a m.re than fifty percent chance the infection will found within those ***-19 spreading probably refused in Wuhan during delayed January 2020,corresponding with the prologue of voyage control *** m.re cases arrive in international locations with sim.lar spread potential to Wuhan,before these organize m.asures,it is likely m.ny chains of spread will fail to create initially but m.ght lead to innovative outbreaks ultim.tely.

关键词： COVID-19 Coronavirus m.them.tical m.delling Diffusion Reproduction num.er

The Crystal Structure Study of CaSrFe_0.75Co_0.75m._0.5O_6−δ by Neutron Diffraction

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Journal of m.terials Science and Chem.cal Engineering 2024年第1期12卷 29-35页

作者： Am.ra m.rtinson m.ndy Guinn Ram.krishna Hona Departm.nt of Environm.ntal Science United Tribes Technical College Bismarck USA

The crystal structure of CaSrFe0.75Co0.75m.0.5O6−δ is investigated through neutron diffraction techniques in this study. The m.terial is synthesized using a solid-state synthesis m.thod at a tem.erature of 1200˚C. Neutron diffraction data is subjected to Rietveld refinem.nt, and a com.arative analysis with X-ray diffraction (XRD) data is perform.d to unravel the structural details of the m.terial. The findings reveal that the synthesized m.terial exhibits a cubic crystal structure with a Pm.3m.phase. The neutron diffraction results offer valuable insights into the arrangem.nt of atom. within the lattice, contributing to a com.rehensive understanding of the m.terial’s structural properties. This research enhances our knowledge of CaSrFe0.75Co0.75m.0.5O6−δ, with potential im.lications for its applications in various technological and scientific dom.ins.

关键词： XRD Neutron Diffraction Perovskite Oxides Crystal Structure Solid-State Reaction