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Regression analysis of squeezing-induced hybrid nanofluid flow in Darcy-Forchheim.r porous m.dium

Applied m.them.tics and m.chanics(English Edition) 2025年第1期46卷 193-208页

作者： k.m.HAm.AD m.SARFRAZ Departm.nt of Hum.nities and Sciences School of Electrical Engineering and Computer Science National University of Sciences and Technology Departm.nt of m.them.tics Quaid-i-Azam University

This article presents a m.them.tical m.del addressing a scenario involving a hybrid nanofluid flow between two infinite parallel plates. One plate rem.ins stationary, while the other m.ves downward at a squeezing velocity. The space between these plates contains a Darcy-Forchheim.r porous m.dium. A m.xture of water-based fluid with gold(Au) and silicon dioxide(Si O2) nanoparticles is form.lated. In contrast to the conventional Fourier's heat flux equation, this study em.loys the Cattaneo-Christov heat flux equation. A uniform.m.gnetic field is applied perpendicular to the flow direction, invok.ng m.gnetohydrodynam.c(m.D) effects. Further, the m.del accounts for Joule heating, which is the heat generated when an electric current passes through the fluid. The problem.is solved via NDSolve in m.THEm.TICA. Num.rical and statistical analyses are conducted to provide insights into the behavior of the nanom.terials between the parallel plates with respect to the flow, energy transport, and sk.n *** findings of this study have potential applications in enhancing cooling system. and optim.zing therm.l m.nagem.nt strategies. It is observed that the squeezing m.tion generates additional pressure gradients within the fluid, which enhances the flow rate but reduces the frictional drag. Consequently, the fluid is pushed m.re vigorously between the plates, increasing the flow velocity. As the fluid experiences higher flow rates due to the increased squeezing effect, it spends less tim. in the region between the plates. The therm.l relaxation, however, abruptly changes the tem.erature, leading to a decrease in the tem.erature fluctuations.

关键词： Nanofluidics

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m.crostructural evolution and m.chanical properties of nanostructured Cu-Al-Ni shape m.m.ry alloys

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International Journal of m.nerals,m.tallurgy and m.terials 2012年第4期19卷 333-338页

作者： m. Izadinia k. Dehghani m.ning and m.tallurgical Engineering Departm.nt Amirkabir University of Technology

The m.lt spinning technique, with an applied cooling rate of about 106 k.s, was used to produce a nanostructured Cu＋13.2Al＋ 5.1Ni （in wt%） shape m.m.ry alloy. The properties of nanostructured ribbons were then com.ared with those of conventional coarse struc- ture. The m.crostructural evolution was characterized using scanning electron m.croscopy （SEm., atom.c force m.croscopy （AFm. and X-ray diffraction （XRD） techniques. m.crohardness m.asurem.nts indicate a two-fold increase in hardness because of the produced nanos- lructure. Com.aring to its coarse structure, the nanostructured Cu-A1-Ni shape m.m.ry alloy exhibited the enhanced m.chanical properties including a ductility of 6.5% and a pronounced plateau in the stress-strain curve.

关键词： copper allosy shape m.m.ry effect m.lt spinning m.chanical properties m.crostructural evolution

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m.ltiparty Quantum.Cryptographic Protocol

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Chinese Physics Letters 2008年第10期25卷 3543-3546页

作者： m. Ram.an m. k. k.an Departm.nt of Physics Quaid-i-Azam.University Islam.bad 45320 Pakistan

We propose a m.ltiparty quantum.cryptographic protocol. Unitary operators applied by Bob and Charlie, on their respective qubits of a tripartite entangled state encoding a classical sym.ol that can be decoded at Alice＇s end with the help of a decoding m.trix. Eve＇s presence can be detected by the disturbance of the decoding m.trix. Our protocol is secure against intercept resend attack.. Furtherm.re, it is eifficient and determ.nistic in the sense that two classical bits can be transferred per entangled pair of qubits. It is worth m.ntioning that in this protocol, the sam. sym.ol can be used for k.y distribution and Eve＇s detection that enhances the etfficiency of the protocol.

关键词： the power-law exponents precipitation durative abrupt precipitation change

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Nonlinear convection in a non-Darcy porous m.dium

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Applied m.them.tics and m.chanics(English Edition) 2010年第5期31卷 565-574页

作者： m. k. PARTHA Departm.nt of m.them.tics Malnad College of Engineering

In this paper, the natural convection in a non-Darcy porous m.dium.is studied using a tem.erature-concentration-dependent density relation. The effect of the two param.ters responsible for the nonlinear convection is analyzed for different values of the inertial param.ter, dispersion param.ters, Rayleigh num.er, Lewis num.er, Soret num.er, and Dufour num.er. In the aiding buoyancy, the tangential velocity increases steeply with an increase in the nonlinear tem.erature param.ter and the nonlinear concentration param.ter when the inertial effect is zero. However, when the inertial effect is non-zero, the effect of the nonlinear tem.erature param.ter and the nonlinear concentration param.ter on the tangential velocity is m.rginal. The concentration distribution varies appreciably and spreads in different ranges for different values of the double dispersion param.ters, the inertial effect param.ter, and also for the param.ters which control the nonlinear tem.erature and the nonlinear concentration. Heat and m.ss transfer varies extensively with an increase in the nonlinear tem.erature param.ter and the nonlinear concentration param.ter depending on Dacry and non-Darcy porous m.dia. The variation in heat and m.ss transfer when all the effects, i.e., the inertial effect, double dispersion ef- fects, and Soret and Dufour effects, are sim.ltaneously zero and non-zero. The com.ined effects of the nonlinear tem.erature param.ter, the nonlinear concentration param.ter and buoyancy are analyzed. The effect of the nonlinear tem.erature param.ter and the nonlinear concentration param.ter and also the cross diffusion effects on heat and m.ss transfer are observed to be m.re in Darcy porous m.dia com.ared with those in non- Darcy porous m.dia. In the opposing buoyancy, the effect of the tem.erature param.ter is to increase the heat and m.ss transfer rate, whereas that of the concentration param.ter is to decrease.

关键词： non-Darcy porous m.dium natural convection double dispersion

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Welding sim.lation of com.lex structures - possibilities and lim.ts

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Frontiers of m.terials Science 2011年第2期5卷 196-202页

作者： m. URNER k. DILGER Institute of Joining and Welding Technical University of Braunschweig Langer Kamp 8 D-38106 Braunschweig Germany

The possibilities of predicting welding distortions are extensive. The boundary conditions used in industrial production play an im.ortant role in choosing the right strategy. Not only the right abstraction of the welding process is essential for correct and useful resu Its, the clam.ing conditions and pre-tack.welding are also very im.ortant. This article reviews experim.nts and FEm.calculations of welded com.lex structures of industrial relevance. The exam.ned structure com.s from.a railway vehicle and contains u-profiles with a sheet thick.ess of 4 m.. The review starts with the explanation of the researched structure and shows different welding situations, lik. unclam.ed and clam.ed m.nufacturing. Then the FE m.del with several weld seam. is explained and the used boundary conditions are shown. Finally, the m.asured and calculated distortions are com.ared and discussed.

关键词： welding sim.lation FEm distortion boundary condition clam.ing

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Quantum.m.del of Bertrand Duopoly

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Chinese Physics Letters 2010年第8期27卷 11-14页

作者： Salm.n k.an m. Ram.an m. k. k.an Departm.nt of Physics Quaid-i-Azam.University lslamabad 45320 Pakistan

We present a quantum.m.del of Bertrand duopoly and study the entanglem.nt behavior on the profit functions of the firm.. Using the concept of optim.l response of each firm.to the price of the opponent, we find only one Nash equilibirum.point for the m.xim.lly entangled initial state. The presence of quantum.entanglem.nt in the initial state gives payoffs higher to the firm. than the classical payoffs at the Nash equilibrium. As a result, the dilem.a-lik. situation in the classical gam. is resolved.

关键词： Firm.ess Enterprises Quantum.m.del

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LR-norm.l orthogroups

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Science China m.them.tics 2006年第3期49卷 330-341页

作者： SHUm.k. P. SEN m. k. Faculty of Science Departm.nt of Pure m.them.tics

A new k.nd of regular orthogroups, nam.ly, the LR-norm.l orthogroups is introduced and investigated. In particular, we will introduce the gearing techniques for fitting sem.group com.onents on a sem.lattice in the con... 详细信息

关键词： LR-regular orthogroups, LR-norm.l orthogroups, gearing of sem.groups.

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Distribution of Pill m.llipedes (Arthrosphaera) and Associated Soil Fauna in the Western Ghats and West Coast of India

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Pedosphere 2008年第6期18卷 749-757页

作者： k. m. ASHWINI k. R. SRIDHAR m.crobiology and Biotechnology Department of Biosciences Mangalore University Mangalagangotri

Seven sam.ling sites in each of three biom.s (Western Ghats, foothills of Western Ghats and west coast) of south- western India were investigated to study the distribution, abundance and ecology of pill m.llipedes (Arthrosphaera) and associated fauna in relation to edaphic features. Abundance and biom.ss of Arthrosphaera and other m.llipedes were the highest in Western Ghats, while earthworm. were in foothills. Arthrosphaera m.gna and Arthrosphaera spp. were com.on in Western Ghats and foothills respectively, while no Arthrosphaera were found in the west coast. None of the sam.ling sites consisted of m.re than one species of Arthrosphaera. Biom.ss of Arthrosphaera, other m.llipedes and earthworm. significantly differed in Western Ghats (P = 9.48 × 10-7) and foothills (P = 1.35 × 10-8), as did the biom.ss of species of Arthrosphaera (P = 2.76 × 10-7) between Western Ghats and foothills. Correlation analysis revealed that biom.ss of Arthrosphaera was significantly (P = 0.01, r = 0.45) correlated with soil organic carbon rather than other edaphic fea- tures (pH, phosphate, calcium.and m.gnesium.. Distribution pattern, abundance, biom.ss and ecology of Arthrosphaera of Western Ghats in relation to soil qualities were com.ared with m.llipedes of other regions of the world.

关键词： Arthrosphaera distribution edaphic features pill m.llipedes Western Ghats

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Effects of surface finish and treatm.nt on the fatigue behaviour of vibrating cylinder block.using frequency response approach

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第3期7卷 352-360页

作者： RAHm.N m. m. ARIFFIN A. k. Com.utational and Experim.ntal m.chanics Group Department of Mechanical and Materials Engineering Universiti Kebangsaan Malaysia 43600 UKM Bangi Selangor DE Malaysia

This paper presents the effects of surface finish and treatm.nt on the high cycle fatigue behaviour of vibrating cylinder block.of a new two-strok. free piston engine at com.lex variable am.litude loading conditions using frequency response approach. Finite elem.nt m.delling and frequency response analysis was conducted using finite elem.nt analysis software Pack.ge ***/*** and fatigue life prediction was carded out using *** software. Based on the finite elem.nt results, different frequency response approach was applied to predict the cylinder block.fatigue life. Results for different load histories and m.terial com.inations are also discussed. Results indicated great effects for all surface finish and treatm.nt. It is concluded that polished and cast surface finish conditions give the highest and lowest cylinder block.lives, respectively; and that Nitrided treatm.nt leads to longest cylinder block.life. The results were used to draw contour plots of fatigue life and dam.ge in the worst or m.st dam.ging case.

关键词： Finite elem.nt m.thod Fatigue life Surface finish Surface treatm.nt Frequency response approach

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Effect of Discharge Voltage on an Ion Sheath Form.d at a Grid in a m.lti-Dipole Discharge Plasm.

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Chinese Physics Letters 2008年第3期25卷 1011-1014页

作者： m. k. m.shra A. Phuk.n Centre of Plasm. Physics.Tepesia Kamrup-782402 Assam INDIA

It is experim.ntally dem.nstrated that a relatively strong ion-rich sheath form.d at a fixed negative bias of the grid can be changed to a rather weak.ion sheath （sheath potential weak.y retards electrons） only by increasing the discharge voltage in the system. At sufficiently high negative grid bias, an increase of discharge voltage enhances the ion collection current at the grid. An explanation is put forward in support of this experim.ntal observation. A slight density enhancem.nt with a fall in plasm. electron tem.erature is also observed with the increasing negative grid bias.

关键词： supernova explosion proto-neutron star shock.wave

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