检索结果-南通市图书馆

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： convective boundary condition Darcy-Forchheim.r m.dium hybrid nanofluid Joule heating m.gnetohydrodynam.c (m.D) num.rical solution squeezing flow regression analysis O361 O175.2

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

CAVITATION NUCLEI:EXPERIm.NTS AND THEORY

引用

Journal of Hydrodynam.cs 2009年第2期21卷 176-189页

作者： m.RCH k.a. Departm.nt of Physics and Center of Quantum.Protein DK-2800 Kongens LyngbyDenmark

The Swedish astrophysicist and Nobel Prize winner Hannes Alfven said： Theories com. and go -- the experim.nt is here forever. Often a theory, which we set up to describe an observed physical phenom.non, suffers from.the lack.of k.owledge of decisive param.ters, and therefore at best the theory becom.s insufficient. Contrary, the experim.nt always reveals nature itself, though at prevailing experim.ntal conditions. With essential param.ters being out of control and even m.ybe unidentified, apparently sim.lar experim.nts m.y deviate way beyond our expectations. However, these discrepancies offer us a chance to reflect on the character of the unk.own param.ters. In this way non-concordant experim.ntal results m.y hold the k.y to the developm.nt of better theories - and to new experim.nts for the testing of their validity. Cavitation and cavitation nuclei are phenom.na of that character.

关键词： cavitation nuclei gas bubbles surface nano voids scanning tunneling m.croscopy atom.c force m.croscopy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Tensile and Im.act Properties of Shielded m.tal Arc Welded AISI 409m.Ferritic Stainless Steel Joints

引用

Journal of m.terials Science & Technology 2009年第2期25卷 181-186页

作者： k. Shanm.gam.A.k. Lak.hm.narayanan V. Balasubram.nian Centre for m.terials Joining & Research (CEm.JOR) Department of Manufacturing Engineering Annamalai UniversityAnnamalai Nagar 608 002 Tamil Nadu India

The present study is concerned with the effect of filler m.tals such as austenitic stainless steel, ferritic stainless steel and duplex stainless steel on tensile and im.act properties of the ferritic stainless steel conform.ng to AISI 409m.grade. Rolled plates of 4 m. thick.ess were used as the base m.terial for preparing single pass butt welded joints. Tensile and im.act properties, m.crohardness, m.crostructure and fracture surface m.rphology of the joints fabricated by austenitic stainless steel, ferritic stainless steel and duplex stainless steel filler m.tals were evaluated and the results were reported. From.this investigation, it is found that the joints fabricated by duplex stainless steel filler m.tal showed higher tensile strength and hardness com.ared to the joints fabricated by austenitic and ferritic stainless steel filler m.tals. Joints fabricated by austenitic stainless steel filler m.tal exhibited higher ductility and im.act toughness com.ared with the joints fabricated by ferritic stainless steel and duplex stainless steel filler m.tals.

关键词： Ferritic stainless steel Shielded m.tal arc welding Tensile properties Im.act toughness

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nonlinear convection in a non-Darcy porous m.dium

引用

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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

m.ltiparty Quantum.Cryptographic Protocol

引用

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

作者： m. Ram.an m. k. k.a. 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

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

引用

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 k.lan 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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

LR-norm.l orthogroups

引用

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.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

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

引用

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

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A 4-quadrant Curvelet Transform.for Denoising Digital Im.ges

引用

International Journal of Autom.tion and com.uting 2013年第3期10卷 217-226页

作者： P. k. Parlewar k. m. Bhurchandi Departm.nt of Electronic and Com.unication Engineering Ramdeobaba College of Engineering and Management Departm.nt of Electronic Engineering Visvesvaraya National Institute of Technology

The conventional discrete wavelet transform.（DWT） introduces artifacts during denoising of im.ges containing sm.oth curves. Finite ridgelet transform.（FRIT） solved this problem.by m.pping the curves in term. of sm.ll curved ridges. However, blind application of FRIT all over an im.ge is com.utationally heavy. Finite curvelet transform.（FCT） selectively applies FRIT only to the tiles containing sm.ll portions of a curve. In this work. a novel curvelet transform.nam.d as 4-quadrant finite curvelet transform.（4QFCT） based on a new concept of 4-quadrant finite ridgelet transform.（4QFRIT） has been proposed. An im.ge is band pass filtered and the high frequency bands are divided into sm.ll non-overlapping square tiles. The 4QFRIT is applied to the tiles containing at least one curve elem.nt. Unlik. FRIT, the 4QFRIT tak.s 4 sets of radon projections in all the 4 quadrants and then averages them.in tim. and frequency dom.ins after denoising. The proposed algorithm.is extensively tested and benchm.rk.d for denoising of im.ges with Gaussian noise using m.an squared error （m.E） and peak.signal to noise ratio （PSNR）. The results confirm.that 4QFCT yields consistently better denoising perform.nce quantitatively and visually.

关键词： Curvelet transform ridgelet transform 4-quadrant ridgelet transform 4-quadrant curvelet transform denoising.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：