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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, invoking 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 skin *** 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.

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High-pressure investigations on Piplia kalan eucrite m.teorite using in-situ X-ray diffraction and ^(57)Fe m.ssbauer spectroscopic technique up to 16 GPa

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Geoscience Frontiers 2016年第2期7卷 265-271页

作者： Usha Chandra k.k. Pandey G. Parthasarathy Surinder m. Sharm. Departm.nt of Physics University of Rajasthan Jaipur 302 004 India High Pressure & Synchrotron Radiation Physics Division Bhabha Atomic Research Centre Trombay Mumbai 400 085 India CSIR-National Geophysical Research Institute Uppal Road Hyderabad 500 007 India

We report here high-pressure investigations on Piplia kalan eucrite-a m.m.er of HED （Howardite -Eucrite-Diogenite） fam.ly from.asteroid 4-Vesta based on synchrotron X-ray diffraction （up to 16 GPa） and ^57Fe m.ssbauer spectroscopy （up to 8 GPa）. Dom.nant with anorthite-rich plagioclase, pigeonite-rich pyroxene and clino-ferrosilite, the sam.le displayed various phase transitions attaining am.rphous character at 16 GPa. These phase transitions of individual com.onents could be explained sim.ltaneously through variations in high-pressure XRD patterns and the m.ssbauer param.ters. m.st prom.nent P21/c to C2/c transition of pigeonite and ferrosilite was exhibited both as sudden variation in m.ssbauer param.ters and population inversion of Fe^2＋ in m. and m. sites between 2.9 and 3.8 GPa and variation in intensity profile in XRD patterns at 3.56 GPa. Anorthite seem.d to respond m.re to such im.act than other com.onents in the sam.le. Com.lete am.rphization in anorthite which occurred at lower pressure of - 12 GPa im.lied residual stress experienced due to shock im.act. The presence of high pressure （m.noclinic） phase of pigeonite and ferrosilite at am.ient condition in this eucrite sam.le confirm.d earlier suggestions of an early shock event. This report is an attem.t to em.hasize the role of anorthite in the determ.nation of the residual stress due to im.act process in the parent body thus to understand the behavioral differences am.ngst HED m.m.ers.

关键词： m.teorites High pressure X-ray diffraction m.ssbauer spectroscopy Eucrites synchrotron radiation Ferrosilite

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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. khan 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 attacks. 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 key 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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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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Synthesis of Aligned ZnO Nanorod Array on Silicon and Sapphire Substrates by Therm.l Evaporation Technique

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Journal of m.terials Science & Technology 2011年第8期27卷 701-706页

作者： k.m.k. Srivatsa Deepak Chhikara m. Senthil kum.r m.terials Physics and Engineering Division National Physical Laboratory Council of Scientific & Industrial Research (CSIR) Physics of Energy Harvesting Division National Physical Laboratory Council of Scientific & Industrial Research (CSIR)

High density ZnO nanorods were grown by therm.l evaporation of Zn powder at 700℃ on Si （100） and sapphire （0001） substrates at atm.spheric pressure without adding any catalyst. The nanorods were characterizated in term. of their structural and optical properties. The nanorods grown on Si have a diam.ter of 350-400 nm.and a length of 1.2 μm.while those on sapphire have a diam.ter of 600-800 nm.and a length of 2.5 μm. During the structural characterization, it is noticed that the rods grow along the （0002） plane with perfect hexagonal facet. The room.tem.erature photolum.nescence spectrum.showed a strong UV em.ssion peak at 385 nm.with a weak green band em.ssion, which confirm. that nanorods have good optical properties. It is observed that the oxygen partial pressure plays an im.ortant role to control the shape and size of the nanorods in therm.l evaporation growth technique.

关键词： Therm.l evaporation technique ZnO nanorods X-ray diffraction Photolum.nescence

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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 khan m. Ram.an m. k. khan 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-like situation in the classical gam. is resolved.

关键词： QUANTUm.theory PROFIT & loss PRICES NASH equilibrium ECONOPHYSICS

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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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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-stroke 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 Package ***/*** 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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One-loop approxim.tion of m.ller scattering in generalized krein-space quantization

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Science China(Physics,m.chanics & Astronom.) 2009年第2期52卷 212-217页

作者： F. PAYANDEH m. m.HRAFARIN m. V. TAkOOk Physics Departm.nt Amirkabir University of Technology Payam. Noor University Physics Departm.nt Razi University

It has been shown that the negative-norm.states necessarily appear in a covariant quantization of the free m.nim.lly coupled scalar field in de Sitter spacetim.. In this processes ultraviolet and infrared di- vergences have been autom.tically elim.nated. A natural renorm.lization of the one-loop interacting quantum.field in m.nkowski spacetim. (λφ 4) has been achieved through the consideration of the nega- tive-norm.states defined in krein space. It has been shown that the com.ination of quantum.field theory in krein space together with consideration of quantum.m.tric fluctuation, results in quantum.field the- ory without any divergences. Pursuing this approach, we express Wick’s theorem.and calculate m.ller scattering in the one-loop approxim.tion in generalized krein space. The m.them.tical consequence of this m.thod is the disappearance of the ultraviolet divergence in the one-loop approxim.tion.

关键词： quantum field theory krein space negative energy states

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Influence of Heat Input on m.rtensite Form.tion and Im.act Property of Ferritic-Austenitic Dissim.lar Weld m.tals

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Journal of m.terials Science & Technology 2012年第4期28卷 343-352页

作者： m. m.kherjee T.k. Pal Welding Technology Centre Metallurgical and Material Engineering Department Jadavpur University

The effect of heat input on m.rtensite form.tion and im.act properties of gas m.tal arc welded m.dified ferritic stainless steel （409m. sheets （as received） with thickness of 4 m. was described in detail in this work. The welded joints were prepared under three heat input conditions, i.e. 0.4, 0.5 and 0.6 kJ/m. using two different austenitic filler wires （308L and 316L） and shielding gas com.osition of Ar ＋ 5% CO2. The welded joints were evaluated by m.crostructure and charpy im.act toughness. The dependence of weld m.tal m.crostructure on heat input and filler wires were determ.ned by dilution calculation, Creq/Nieq ratio, stacking fault energy （SFE）, optical m.croscopy （Om. and transm.ssion electron m.croscopy （TEm.. It was observed that the m.crostructure as well as im.act property of weld m.tal was significantly affected by the heat input and filler wire. Weld m.tals prepared by high heat input exhibited higher am.unt of m.rtensite laths and toughness com.ared with those prepared by m.dium.and low heat inputs, which was true for both the filler wires. Furtherm.re, 308L weld m.tals in general provided higher am.unt of m.rtensite laths and toughness than 316L weld m.tals.

关键词： Heat input Ferritic-austenitic dissim.lar weld m.rtensite Grain size Toughness

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