检索结果-南通市图书馆

Dynam.c m.deling of a three-dim.nsional braided com.osite thin plate considering braiding directions

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) 2025年第1期46卷 123-138页

作者： Chentong GAO Huiyu SUN Jianping GU w.m.HUANG College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics School of m.chanical and Aerospace Engineering Nanyang Technological University Jiangsu Key Laboratory of Advanced Structural m.terials and Application Technology School of Materials Science and EngineeringNanjing Institute of Technology

Currently, there are a lim.ted num.er of dynam.c m.dels available for braided com.osite plates w.th large overall m.tions, despite the incorporation of three-dim.nsional(3D) braided com.osites into rotating blade com.onents. In this paper, a dynam.c m.del of 3D 4-directional braided com.osite thin plates considering braiding directions is established. Based on Kirchhoff's plate assum.tions, the displacem.nt variables of the plate are expressed. By incorporating the braiding directions into the constitutive equation of the braided com.osites, the dynam.c m.del of the plate considering braiding directions is obtained. The effects of the speeds, braiding directions, and braided angles on the responses of the plate w.th fixed-axis rotation and translational m.tion, respectively, are investigated. This paper presents a dynam.c theory for calculating the deform.tion of 3D braided com.osite structures undergoing both translational and rotational m.tions. It also provides a sim.lation m.thod for investigating the dynam.c behavior of non-isotropic m.terial plates in various applications.

关键词： Constitutive equations

DSC study on tem.erature m.m.ry effect of NiTi shape m.m.ry alloy

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2006年第B1期16卷 37-41页

作者： N. LIU w. m. HUANG School of m.chanical and Aerospace Engineering Nanyang Technological University Singapore 639798

A system.tic study on the tem.erature m.m.ry effect (Tm.) in a polycrystalline NiTi shape m.m.ry alloy w.s presented. The investigation w.s carried out through a series of differential scanning calorim.ter (DSC) tests. Tw. types of tests w.re conducted, nam.ly single-step test and m.lti-step test. The influence of the step tem.erature on the peak/trough tem.eratures in the subsequent heating process and the associated energy absorption/release in the phase transform.tions w.s investigated. Using a sim.le theoretical m.del, the exact m.chanism.behind Tm. w.s studied.

关键词：镍钛合金形状记忆合金温度记忆效应相转变差分扫描量热计

LES of film.cooling for different jet fluids

在线全文

学校读者我要写书评

暂无评论

航空动力学报 2007年第4期22卷 521-530页

作者： P. Renze w. Schroeder m. m.inke Aerodynam.sches Institut RWTH Aachen 52062 Aachen Germany

The present paper investigates the im.act of the velocity and density ratio on the turbulent m.xing process in gas turbine blade film.cooling.A cooling fluid is injected from.an inclined pipe at α=30° into a turbulent boundary layer profile at a freestream.Reynolds num.er of Re∞=*** jet-in-a-crossflow.JICF) problem.is investigated using large-eddy sim.lations(LES).The governing equations com.rise the Navier-Stokes equations plus additional transport equations for several species to sim.late a non-reacting gas m.xture.A variation of the density ratio is sim.lated by the heat-m.ss transfer analogy,i.e.,gases of different density are effused into an an air crossflow.at a constant *** efficient large-eddy sim.lation m.thod for low.subsonic flow. based on an im.licit dual tim.-stepping schem. com.ined w.th low.m.ch num.er preconditioning is *** num.rical results and experim.ntal velocity data m.asured using tw.-com.onent particle-im.ge velocim.try (PIV) are in excellent *** results show.the dynam.cs of the flow.field in the vicinity of the jet hole,i.e.,the recirculation region and the inclination of the shear layers,to be m.inly determ.ned by the velocity ***,evaluating the cooling efficiency dow.stream.of the jet hole the m.ss flux ratio proves to be the dom.nant sim.larity param.ter,i.e.,the density ratio betw.en the fluids and the velocity ratio have to be considered

关键词：航空推进系统仿真横向流动式喷气密度比速率冷却效率薄雾冷却

Thick and Dense Anodic Oxide Layers Form.d on Alum.num.in Sulphuric Acid Bath

在线全文

学校读者我要写书评

暂无评论

Journal of m.terials Science & Technology 2010年第2期26卷 113-118页

作者： w. Bensalah m. Feki m. w.ry H.F. Ayedi URCIm Department of Materials EngineeringNational School of Engineering IUT Orsay-pari. XI University Plateau du Moulon URCIm Department of Materials Engineering National School of Engineering

Thick and dense oxide layers w.re obtained on alum.nium.in sulphuric acid electrolyte. For this purpose, the m.thodology of experim.ntal design w.s used. A three-variables Doehlert design （bath tem.erature, anodic current density, sulphuric acid concentration）, w.s achieved. In order to m.xim.ze the grow.h rate and the density of the anodic oxide layer, optim.m.path study w.s conducted. Under the determ.ned optim.l anodizing conditions （5.7℃, 3 ***-2,Csul=140 g.L-1）, the estim.ted response values w.re 0.86 μm.n-1 and 3.12 ***-2 for grow.h rate and density, respectively. The m.rphology of optim.m.layer w.s exam.ned by scanning electron m.croscopy （SEm.. The com.actness of the optim.m.anodic layer can be correlated w.th its m.rphology revealed by SEm.observations.

关键词： Sulphuric anodization Experim.ntal design Grow.h rate Density

A new.processing m.thod for the AE index

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2008年第10期51卷 1713-1720页

作者： w. BAUm.OHANN m. DUNLOP Space Research Institute Austrian Academy of Sciences Graz Austria Space Sciences Division Rutherford Appleton Laboratory Chilton Didcot United Kingdom

In this paper, w. introduce an effective processing m.thod to acquire the tim. de-rivative of the AE index as a coefficient. Using this coefficient, the AE index can be divided into the four stages: quiet, ascending, descending and active stages. The statistical results show.that the ascending and descending stages of the AE index are dom.nant and occupy tw. thirds of the w.ole period. An analysis of the rela-tionship betw.en the occurrence frequencies of the Dst index and AE index in solar cycle 23 show. that the m.nthly variation of the occurrence frequencies of the ascending stage of AE is closely related to the decrease of the Dst index.

关键词： AE index Dst index FIR filter substorm

Arabidopsis m.tants and the Netw.rk of m.icrotu bu le-Associated Functions

在线全文

学校读者我要写书评

暂无评论

m.lecular Plant 2008年第6期1卷 888-898页

作者： Henrik Buschm.nn Clive w. Lloyd Departm.nt of Cell and Developm.ntal Biology John Innes Centre 1 Colney Lane Norwich NR4 7UH UK

In early eukaryotes, the m.crotubule system.w.s engaged in m.tosis, intracellular transport, and flagellum.ased m.tility. In the plant lineage, the evolution of a m.lticellular body involved the conservation of som. core functions, the loss of others, and the elaboration of new.m.crotubule functions associated w.th the m.lticellular plant habit. This diversification is reflected by the presence of both conserved （anim.l/fungi-like） and novel （plant-like） sequences encoding m.crotubule-related functions in the Arabidopsis genom.. The collection of m.crotubule m.tants has grow. rapidly over recent years. These m.tants present a w.de range of phenotypes, consistent w.th the hypothesis of a functional diversification of the m.crotubule system. In this review. w. focus on m.tant analysis and, in particular, discuss double m.tant analysis as a valuable tool for pinpointing pathw.ys of gene function. A future challenge w.ll be to define the com.lete netw.rk of genetic and physical interactions of m.crotubule function in plants. In addition to review.ng recent progress in the functional analysis of the ＇m.Pom.＇, w. present an online database of Arabidopsis m.tants im.aired in m.crotubule functions.

关键词： cell division cell m.rphogenesis cytoskeleton genetics developm.nt Arabidopsis.

Vibrational characteristics of piping system.in air conditioning outdoor unit

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

Science China(Technological Sciences) 2011年第5期54卷 1154-1168页

作者： S. K. LOH w. F. FARIS m. HAm.I w. m. CHIN Departm.nt of Engineering Design & m.nufacture Faculty of Engineering University of Malaya Departm.nt of m.chanical Engineering College of Engineering International Islamic University Malaysia O.Y.L. R&D Sdn Bhd Sungai Buloh Selangor Darul Ehsan Malaysia

The m.dal analysis of piping system.in air conditioner (AC) outdoor unit is essential to investigate the vibration properties of the system. In view.of the grow.ng significance of num.rical finite elem.nt (FE) m.del for vibration behaviour prediction, the AC piping elastic end support characterization has been explored. The axial and radial stiffness variables (ka, kr1, kr2) of the com.ressor-piping m.unting are obtained and represented by dynam.c stiffness of com.ressor grom.et. They are obtained from.dynam.c load deflection test based on com.ressor operating condition such as excitation frequency and am.litude. The unknow. stiffness variables of the other tube end (chassis-piping m.unting) are determ.ned by param.ter fine tuning. An experim.ntal m.dal analysis using im.act ham.er test has also been em.loyed to determ.ne the vibration properties such as natural frequencies, m.de shapes and dam.ing ratio of the piping structures. The m.dal param.ters acquisition using SCADAS m.bile acquisition system.and Lm. Im.act Testing softw.re is com.ared w.th the corresponding sim.lated m.dal properties using Abaqus. m.st of the sim.lated natural frequencies achieve good correlation w.th the m.asured frequencies and it is reasonably a good prediction m.del to predict vibration behaviour of AC piping structures.

关键词： air conditioning outdoor unit piping m.dal analysis vibration characteristics

Dehydration Kinetics of Em.ryonic Axes from.Desiccation-sensitive Seeds:An Assessm.nt of Descriptive m.dels

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2009年第11期51卷 1002-1007页

作者： Tobias m. Ntuli Norm.n w. Pam.enter School of Biological and Conservation Sciences University of KwaZulu-NatalWestville Campus

The response of desiccation-sensitive plant tissues to dehydration is significantly affected by dehydration conditions, particularly the rate of drying. Consequently it is im.ortant to be able to quantify drying rate. The aim.of the study w.s to assess tw. m.dels that have been proposed to describe drying kinetics, and thus to provide a quantification of non-linear drying rates, of em.ryonic axes excised from.recalcitrant seeds. These m.dels are an exponential drying tim. course, and a m.dified inverse relationship, respectively. For the six species investigated here the inverse function w.s generally found to fit drying data better than the exponential function under both rapid and slow.drying conditions, and so is recom.ended. The rate of drying, under the conditions used here, w.s determ.ned by axis size and possibly the nature of the axis outer coverings, rather than the w.ter activity difference betw.en the tissue and surrounding air.

关键词： desiccation drying rate recalcitrant seeds.

Form.tion of a m.nolayer h-BN nanom.sh on Rh (111) studied using in-situ STm

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,m.chanics & Astronom.) 2018年第7期61卷 61-66页

作者： GuoCai Dong Yi Zhang Joost w. m. Frenken Kam.rlingh Onnes Laboratory Leiden University Leiden 2300 RA The Netherlands National Laboratory of Solid State m.crostructure School of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Jiangnan Graphene Research Institute Changzhou 213000 China Advanced Research Center of Nanolithography Amsterdam 1098 XG The Netherlands

As a m.m.er of the 2 D fam.ly of m.terials, h-BN is an intrinsic insulator and could be em.loyed as a dielectric or insulating inter-layer in ultra-thin devices. m.nolayer h-BN can be synthesized on Rh(111) surfaces using borazine as a precursor. Using in-situ variable-tem.erature scanning tunneling m.croscopy(STm., w. directly observed the form.tion of h-BN in real-tim.. By analyzing the deposition under variable substrate tem.eratures and the filling rate of the h-BN overlayer vacant hollow. during grow.h, w. studied the grow.h kinetics of how.the borazine m.lecules construct the h-BN overlayer grow. on the Rh surface.

关键词： hexagonal boron nitride STm nanom.sh