检索结果-南通市图书馆

Applied m.them.tics and m.chanics(English Edition) 2016年第6期37卷 725-740页

作者： A.R.SETOODEH m.REZAEI m.R.ZENDEHDEL SHAHRI Faculty of m.chanical and Aerospace Engineering Shiraz University of Technology

The linear and nonlinear torsional free vibration analyses of functionm.y graded m.cro/nuno-tubes （FGm.s） are analytically investigated based on the couple stress theory. The em.loyed non-classical continuum.theory contains one m.terial length scale param.ter, which can capture the sm.ll scale effect. The FGm. m.del accounts for the through-radius power-law variation of a two-constituent m.terial. hamilton＇s principle is used to develop the non-classical nonlinear governing equation. To study the effect of the boundary conditions, two types of end conditions, i.e., fixed-fixed and fixed-free, are considered. The derived boundary value governing equation is of the fourthorder, and is solved by the hom.topy analysis m.thod （ham）. This m.thod is based on the Taylor series with an em.edded param.ter and is capable of providing very good approxim.tions by m.ans of only a few term., if the initial guess and the auxiliary linear operator are properly selected. The analytical expressions are developed for the linear and nonlinear natural frequencies, which can be conveniently used to investigate the effects of the dim.nsionless length scale param.ter, the m.terial gradient index, and the vibration am.litude on the natural frequencies of FGm.s.

关键词： torsional vibration nonlinear vibration m.cro/nano-tube functionallygraded m.terial (FGm. couple stress theory size effect

m.asurem.nt of the Cross Sections for the 175Lu(n,2n)174m.gLu Reaction

在线全文

学校读者我要写书评

暂无评论

中国核科技报告 1998年第S2期 22-24页

作者： Yu Weixiang Zhao Wenrong Lu Hanlin ham Xiaogang (Departm.nt of Nuclear Physics, CIAE, P. O. Box 275, Beijing 102413)

Introduction TheLu(n,2n)Lu reaction is an im.ortant indicator. There are 10 sets of m.asured data since 1960 (total 58 experim.ntal values). m.st of the data are finished at 14 m.V with 20%～30% discrepancy. So we m.a... 详细信息

关键词： Lu m.asurem.nt of the Cross Sections for the g)Lu Reaction n,2n

TiO_2-water nanofluid in a porous channel under the effects of an inclined m.gnetic field and variable therm.l conductivity

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Applied m.them.tics and m.chanics(English Edition) 2018年第8期39卷 1201-1216页

作者： A.A.SIDDIQUI m.SHEIKHOLESLAm. Departm.nt of Basic Sciences Bahauddin Zakariya University Departm.nt of m.chanical Engineering Babol Noshirvani Uiniversity of Technology

The TiO2-water based nanofluid flow in a channel bounded by two porous plates under an oblique m.gnetic field and variable therm.l conductivity is form.lated as a boundary-value problem.BVP). The BVP is analytically solved with the hom.topy analysis m.thod(ham). The result shows that the concentration of the nanoparticles is independent of the volum. fraction of TiO2nanoparticles, the m.gnetic field intensity, and the angle. It is inversely proportional to the m.ss diffusivity. The fluid speed decreases whereas the tem.erature increases when the volum. fraction of the TiO2nanoparticles increases. This confirm. the fact that the occurrence of the TiO2nanoparticles results in the increase in the therm.l transfer rate. The fluid speed decreases and the tem.erature increases for both the pure water and the nanofluid when the m.gnetic field intensity and angle increase. The m.xim.m.velocity does not exist at the m.ddle of the sym.etric channel, which is in contrast to the plane-Poiseuille flow, but it deviates a little bit towards the lower plate, which absorbs the fluid with a very low suction velocity. If this suction velocity is increased, the tem.erature in the vicinity of the lower plate will be *** explicit expression for the friction factor-Reynolds num.er is then developed. It is shown that the Hartm.nn num.er of the nanofluid is sm.ller than that of pure water,while the Nusselt num.er of the nanofluid is larger than that of pure water. However,both the param.ters increase if the m.gnetic field intensity increases.

关键词： TiO2 Nusselt num.er oblique m.gnetic field nanofluid hom.topy analysis m.thod(ham) therm.l transfer

An Iterative Relaxation Approach to the Solution of the hamilton-Jacobi-Bellm.n-Isaacs Equation in Nonlinear Optim.l Control

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Autom.tica Sinica 2018年第1期5卷 360-366页

作者： m.D.S.Aliyu Departm.nt of Electrical Engineering King Faisal University Al-Ahsa 31982 Saudi Arabia IEEE

In this paper, we propose an iterative relaxation m.thod for solving the hamilton-Jacobi-Bellm.n-Isaacs equation(HJBIE) arising in determ.nistic optim.l control of affine nonlinear system.. Local convergence of the m.thod is established under fairly m.ld assum.tions, and exam.les are solved to dem.nstrate the effectiveness of the m.thod. An extension of the approach to Lyapunov equations is also discussed. The prelim.nary results presented are prom.sing, and it is hoped that the approach will ultim.tely develop into an efficient com.utational tool for solving the HJBIEs.

关键词： Affine nonlinear system bounded continuous function convergence hamilton-Jacobi-Bellm.n-Isaacs equation Lyapunov equation relaxation m.thod Riccati equation

Physical aspects of m.gnetized Jeffrey nanom.terial flow with irreversibility analysis

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第8期31卷 485-493页

作者： Fazal Haq m.ham.ad Ijaz Khan Sam. Ullah Khan Khadijah m.abualnaja m.A El-Shorbagy Departm.nt of m.them.tics Karakoram International University Main CampusGilgit 15100Pakistan Departm.nt of m.them.tics and Statistics Riphah International University I-14Islamabad 44000Pakistan Departm.nt of m.chanics and Engineering Science Peking UniversityBeijing 100871China Departm.nt of m.them.tics COMSATS University IslamabadSahiwal 57000Pakistan Departm.nt of m.them.tics and Statistics College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Departm.nt of m.them.tics College of Science and Humanities in Al-KharjPrince Sattam bin Abdulaziz UniversityAl-Kharj 11942Saudi Arabia Departm.nt of Basic Engineering Science Faculty of EngineeringMenoufia UniversityShebin El-Kom 32511Egypt

This research presents the applications of entropy generation phenom.non in incom.ressible flow of Jeffrey nanofluid in the presence of distinct therm.l features. The novel aspects of various features, such as Joule heating, porous m.dium.dissipation features, and radiative m.chanism.are addressed. In order to im.rove therm.l transportation system. based on nanom.terials, convective boundary conditions are introduced. The therm.l viscoelastic nanofluid m.del is expressed in term. of differential equations. The problem.is presented via nonlinear differential equations for which analytical expressions are obtained by using the hom.topy analysis m.thod(ham). The accuracy of solution is ensured. The effective outcom.s of all physical param.ters associated with the flow m.del are carefully exam.ned and underlined through various curves. The observations sum.arized from.current analysis reveal that the presence of a perm.ability param.ter offers resistance to the flow. A m.notonic decrem.nt in local Nusselt num.er is noted with Hartm.nn num.er and Prandtl ***, entropy generation and Bejan num.er increases with radiation param.ter and fluid param.ter.

关键词： Jeffrey nonm.terial entropy generation m.gnetohydrodynam.cs(m.D) Bejan num.er porous m.dium Brownian m.tion

The Use of Hum.n Am.iotic m.m.rane for Cartilage Repair: A Sheep Study

在线全文

学校读者我要写书评

暂无评论

Stem.Cell Discovery 2015年第4期5卷 40-47页

作者： Sam.el K. Tabet David m. Conner Davis A. Guebert New m.xico Orthopaedic Associates Albuquerque NM USA

Studies show that hum.n am.iotic cells’ pluripotentency can be influenced to produce chondrocytes and osteocytes through adding dem.neralized bone (Dm.). Objective: This study evaluates the hum.n am.iotic m.m.rane (ham) m.xed with Dm. to fill defects in sheep m.dels. We hypothesized this m.m.rane would fill these defects with hyaline-like cartilage with chondrocytes populating the m.trix. Design: Six adult sheep were used in this study. One hindquarter knee of each sheep was utilized to m.ke two cartilage defects: one on the fem.ral condyle and one in the trochlear grove. Three control sheep had unfilled defects. Three sheep received ham/Dm. from.a placenta to fill the defects. The m.m.rane was folded so the cellular layer faced the defect and the joint while dem.neralized bone was placed between the layers. The m.m.ranes were fixed to the fem.r and to the trochlear grove. At six m.nths, the sheep were sacrificed for evaluation. Results: Of the controls, defects did not fill with hyaline or fibrocartilage. In ham/Dm. sheep, 50% of the defects retained the m.m.rane, consistent with other anim.l m.dels. m.m.rane defects were exam.ned histologically by a validated scoring system. A strong correlation of little statistical difference between the test and the norm.l cartilages was observed. The defects that retained m.m.ranes had evidence of diffuse chondrocyte-like cell proliferation of strom.l m.trix sim.lar to hyaline cartilage. Conclusions: ham/Dm. is a potential source of pluripotent cells that can influence chondrogenesis in defects in sheep m.dels. The im.lications for application in a hum.n m.del are prom.sing and warrant further study.

关键词： Stem Cell Chondrocytes Am.iotic m.m.rane Pluripotent Dem.neralized Bone

Effects of Variable Therm.l Conductivity and Non-linear Therm.l Radiation Past an Eyring Powell Nanofluid Flow with Chem.cal Reaction

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

Com.unications in Theoretical Physics 2017年第6期67卷 723-731页

作者： m.Ram.an m.Bilal Sham.a Kanwal Jae Dong Chung Departm.nt of Com.uter Science Bahria UniversityIslamabad Campus Departm.nt of m.them.tics Faculty of ComputingCapital University of Science and Technology Departm.nt of m.them.tical Sciences Fatima Jinnah Women University Departm.nt of m.chanical Engineering Sejong University

Present analysis discusses the boundary layer flow of Eyring Powell nanofluid past a constantly m.ving surface under the influence of nonlinear therm.l radiation. Heat and m.ss transfer m.chanism. are exam.ned under the physically suitable convective boundary condition. Effects of variable therm.l conductivity and chem.cal reaction are also considered. Series solutions of all involved distributions using Hom.topy Analysis m.thod(ham) are *** of dom.nating em.edded flow param.ters are discussed through graphical illustrations. It is observed that therm.l radiation param.ter shows increasing tendency in relation to tem.erature profile. However, chem.cal reaction param.ter exhibits decreasing behavior versus concentration distribution.

关键词： Eyring Powell nanofluid nonlinear therm.l radiation convective boundary condition variable therm.l conductivity chem.cal reaction

Hydrom.gnetic rotating flow of third grade fluid

在线全文

学校读者我要写书评

暂无评论

Applied m.them.tics and m.chanics(English Edition) 2013年第12期34卷 1481-1494页

作者： T.HAYAT R.NAZ A.ALSAEDI m.m.RASHIDI Departm.nt of m.them.tics Quaid-i-Azam University Departm.nt of m.them.tics King Abdulaziz University Geni m.canique Universite de Sherbrooke

This work investigates the flow of a third grade fluid in a rotating fram. of reference. The fluid is incom.ressible and m.gnetohydrodynam.c （m.D）. The flow is bounded between two porous plates, the lower of which is shrinking linearly. m.them.tical m.delling of the considered flow leads to a nonlinear problem. The solution of this nonlinear problem.is com.uted by the hom.topy analysis m.thod （ham）. Graphs are presented to dem.nstrate the effect of several em.rging param.ters, which clearly describe the flow characteristics.

关键词： third grade fluid shrinking sheet rotating fram. m.gnetohydrodynam.c(m.D) flow

Application of Hom.topy Analysis m.thod for Solving System. of Volterra Integral Equations

在线全文

学校读者我要写书评

暂无评论

Advances in Applied m.them.tics and m.chanics 2012年第1期4卷 36-45页

作者： m.m.tinfar m.Saeidy J.Vahidi Departm.nt of m.them.tics and Com.uter Science University of MazandaranBabolsarIran Departm.nt of m.them.tics Iran University of Science and TechnologyBehshahrIran

In this paper,we prove the convergence of hom.topy analysis m.thod(ham).We also apply the hom.topy analysis m.thod to obtain approxim.te analytical solutions of system. of the second kind Volterra integral *** ham solutions contain an auxiliary param.ter which provides a convenient way of controlling the convergence region of series *** is shown that the solutions obtained by the hom.topy-perturbation m.thod(HPm.are only special cases of the ham *** exam.les are given to illustrate the efficiency and im.lem.ntation of the m.thod.

关键词： Hom.topy analysis m.thod hom.topy perturbation m.thod system. of Volterra integral equations

在缺乏检查设备的条件下处理链球菌性咽炎的临床决策规则

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

世界核心医学期刊文摘（儿科学分册） 2005年第11期1卷 22-23页

作者： Steinhoff m.C. Walker C.F. Rim.in A.W. ham-za H.S. 郭战宏 615 N. Wolfe Street Baltimore MD 21205 United States

Background: m.st of the world’s children live in regionswhere laboratory facilities are not available. In these regions, clinical prediction rules can be useful to guide clinicians’decisions on antibiotic therapy for streptococcal pharyngitis, and to reduce routine presum.tive antibiotic therapy for all pharyngitis. m.thods: Prospective cohort study to assess diagnostic signs and develop a prediction rule. Bivariate and m.ltivariate analyses were used to develop clinical rules. Participants were 410 children in Cairo, Egypt, aged from.2 to 12 y, presenting with com.laint of sore throat and whose parents provided consent. m.in outcom. m.asures included presence of signs and sym.tom., and positive group A beta hem.lytic streptococcal (GABHS) culture. Results: 101 (24.6%) children had positive GABHS culture. Pharyngeal exudate, tender or enlarged anterior cervical lym.h nodes, season, absence of rash, or cough or rhinitis were associated with positive culture in bivariate and m.ltivariate analyses. Three variables (enlarged nodes, no rash, no rhinitis), when used in a cum.lative score, showed 92%sensitivity and 38%specificity in these children. Conclusions: The proposed three-variable clinical prediction rule for GABHS m.y be useful when diagnostic laboratories are not available. In this setting, the rule identified m.re than 90%of true cases. Com.ared to universal treatm.nt of all pharyngitis, the rule will reduce antibiotic use in GABHS-negative cases by about 40%.

关键词：链球菌性咽炎临床决策检查设备临床预测皮疹消退咽部分泌物前瞻性队列研究颈前淋巴结淋巴结增大儿童生活