第六届国际复合材料工程年会简介

第六届国际复合材料工程年会于１９９９年６月２７日～７月３日在美国佛罗里达州的奥兰多举行．美国国际复合材料联合会和新奥尔良大学工程学院为大会主要发起单位,来自阿根廷,澳大利亚,奥地利,巴西,加拿大,美国,英国,德国,日本等国家和地区的代表约２１０人参加会议,中国大陆有６人出席．本次会议收录论文４８０篇．１０篇大会主题报告的题目为：（１）有微结构增强的强韧陶瓷：设计原位增强氮化硅陶瓷（美国陶瓷学会主席Ｐ．Ｆ．Ｂｅｃｈｅｒ）;（２）复合材料结构的内装式健康监视（美国Ｆ．Ｋ．Ｃｈａｎｇ）;（３）带复盖层…     

第四次国际散体介质细观力学会议简介

１会议概况第四次国际散体介质细观力学会议（简称Ｐｏｗｄｅｒｓ　＆　Ｇｒａｉｎｓ　２００１）于２００１年５月２１日到５月２５日在日本仙台召开．来自法、日、美、英、德、中等１７个国家的１４０多人参加了会议,共收到论文１４０篇,其中７１篇在大会报告交流．口头报告和墙展均已收入会议论文集《Ｐｏｗｄｅｒｓ　ａｎｄ　Ｇｒａｉｎｓ　２００１》,论文数量是历次会议中最多的．前３次会议分别在法国（１９８９）,英国（１９９３）和美国（１９９７）召开,下次会议已决定２００５年在德国召开．这是大陆（３人）和香港（１人）…     

美国“应用力学与材料会议”简介

１．概况１９９９年美国机械工程学会（ＡＳＭＥ）主办的应用力学与材料会议（１９９９ＡＳＭＥＭｅｃｈａｎｉｃｓ＆Ｍａ－ｔｅｒｉａｌｓＣｏｎｆｅｒｅｎｃｅ）,于６月２７日～３０日在美国弗吉尼亚州理工大学召开．有来自美国、日本、英国、法国、德国、意大利、加拿大、俄国、新加坡及中国（包括香港和台湾）等３９个国家的６５０余位代表参加,其中有近半数为美方代表．美英一些知名大学及实验室均有代表参加．会议交流论文８００余篇,分５３个专题研讨会．我国代表黄克智（清华大学）、李国琛（中科院力学所）、徐永波（金属所）、…     

会议消息

’９９全国固体力学学术会议由中国力学学会固体力学专业委员会主办,哈尔滨工业大学复合材料研究所承办的’９９全国固体力学学术会议（’９９ＮＣＳＭ）于１９９９年１月７日～９日在哈尔滨工业大学召开,出席本次会议的正式代表共有１００余人,部分力学界老一辈专家、学者应邀出席了会议并在大会上作了精彩的报告,其中包括黄克智院士,中国力学学会理事长白以龙院士,王光远院士,崔俊芝院士．中国工程院院士黄文虎主持了闭幕式的大会报告．本次学术会议共收到论文１０４篇,会议期间交流了８０篇,其中大会特邀报告１１篇（大会开幕式…     

中国力学学会第五届全国多相流,非牛顿流,物理化学流学术会议简介

中国力学学会第五届全国多相流,非牛顿流,物理化学流学术会议于２０００年１０月３１日到１１月１日在武汉华中科技大学召开．本次会议是过去１９７９年在成都召开的第一届会议,１９８２年在北京召开的第二届会议,１９９０年在杭州召开的第三届会议,１９９３年召开的第四届会议,以及１９９７年在北京召开的第一届国际会议的继续．参加本届会议的代表来自国内力学,工程热物理和热能,化工,冶金,石油,水利等行业共４０人左右,发表论文３１篇,其中气固和液固流动８篇：气液和液液流动９篇,非牛顿流７篇,渗流７篇． 在气固和液固…     

第四届国际多相流会议简介

１会议概况第四届国际多相流会议于２００１年５月２７日到６月１日在美国Ｎｅｗ　Ｏｒｌｅａｎｓ召开．本次会议约有８００多名来自美国,加拿大,欧洲,亚洲（包括中,日,韩,　印等国）的代表参加,宣读论文共５６５篇,其中邀请报告２０篇,分组口头报告和张贴论文５４５篇．中国有清华大学周力行,杨瑞昌,西安交大陈学俊,林宗虎,陈听宽等,中科院工程热物理所蔡瑞贤,浙江大学林建忠,华中科技大学柳朝晖和大庆石油学院的２位代表共１１人参加,宣读论文１０余篇,其中周力行应邀做邀请报告１篇,宣读分组口头报告２篇,张贴论文１…     

国际理论与应用力学联合会非线性与随机结构动力学讨论会简介

国际理论与应用力学联合会非线性与随机结构动力学讨论会（ＩＵＴＡＭＳｙｍｐｏｓｉｕｍｏｎＮｏｎｌｉｎｅａｒｉｔｙ＆ＳｔｏｃｈａｓｔｉｃＳｔｒｕｃｔｕｒａｌＤｙｎａｍｉｃｓ）于１９９９年１月４日～８日在印度马德拉斯（Ｍａｄｒａｓ）印度工学院内召开．主办单位为印度工学院．主要组织者是Ｓ．Ｎａｒａｙａｎａｎ教授．与会代表４６人,参加会议的国家有：加拿大、中国、德国、印度、意大利、挪威、南非、荷兰、英国、美国、越南．大会报告论文３０篇．会议主要讨论非线性随机结构动力学（非线性随机振动）问题．非线性随机结构…     

第七届国际计算流体力学会议简介

１会议概况第七届国际计算流体力学会议于１９９７年９月１６日至１８日在北京召开．来自美国、英国、法国、日本、德国、俄罗斯、印度、韩国、新加坡、澳大利亚、瑞典和中国的１２６名代表出席会议,共收到学术论文１４０多篇．国内代表５２人,国内论文５２篇．美国国...      

科研教学双丰收

科研教学双丰收符松清华大学工程力学系,北京１０００８４清华大学工程力学系近几年来在科研与教学等各项工作上继续取得优异成绩．１９９６年我系发表的学术论文首次突破４００篇,达到４６７篇,居清华大学之首．其中１２７篇发表于国外学术刊物．１９９５年度（９６年...      

第四届亚洲计算流体力学会议学术交流情况

第四届亚洲计算流体力学会议于２０００年９月１９日至２１日在四川绵阳富乐山国际大酒店举办．出席会议的有１２６人,除我国大陆外,还有日本、韩国、印度、新加坡、美国、德国、英国、芬兰、瑞典等国家以及台湾、香港、澳门等地区的代表,远远超出了亚洲的范围．会议发表论文１０４篇,其中大会邀请报告９篇,专题邀请报告１２篇,其它论文８３篇．内容涉及计算流体力学的前沿方向和课题,重点领域的研究进展以及在网格技术、计算格式、并行计算、复杂流动及湍流等方面的新成果,也包含计算流体力学在航空航天及其它工业部门的应用研究．…     

On hysteresis in elasto-plasticity and in ferromagnetism

We define hysteresis as rate-independent memory, illustrate some of its properties, and review some scalar models of elasto-plasticity: the stop, the play, the Prandtl–Ishlinski models. In particular we study the Prager model of linear kinematic hardening, which encompasses stops and plays. We then couple the latter model with the dynamic equation for a one-dimensional system, show existence of a weak solution, and deal with its homogenization. We also discuss the extension to tensors and to three-dimensional systems.

We then deal with ferromagnetic hysteresis. We review the classic Preisach model and a vector extension. Finally, we formulate a model of vector ferromagnetic hysteresis, couple it with the magnetostatic equations, and discuss its homogenization. The latter consists in a two-length-scale model, and corresponds to a variant of the vector Preisach model.     

Genetic disorders in haematological practice in India

Haemoglobinopathies represent a significant national health burden in India. The distribution of specific disorders varies geographically and by community. Heterozygote frequencies of beta-thalassaemia range from 1 to 15%, resulting in an estimated 20 million carriers. HbS is mainly present in tribal and non-caste communities, with carrier prevalences of up to 40%. By comparison, alpha-thalassaemia carriers are found in both the caste and tribal communities, and can reach a frequency of >90% in the latter case. Community control of haemoglobinopathies relies mainly on out-reach education programmes and genetic counselling, with antenatal diagnosis offered in specific major centres. Only partial data are available on the prevalence of haemophilia, but it has been estimated that there are some 50,000 affected individuals nationwide, with an additional 1,500 new cases born each year. RFLP-based techniques have been established to detect mutations in the factor VIII and IX genes, enabling the limited introduction of carrier detection and antenatal diagnosis.     

Heating zone dynamics in in situ combustion

The integrodifferential equation of the quasisteady regime of a moving in situ combustion front is obtained and its exact solution is constructed in a particular case; the possibility of the heat generated at the combustion front being projected into the region ahead of the front is analyzed and the heating zone dynamics in the reservoir and the surrounding rock are investigated. In a number of studies of in situ combustion it is assumed that an increase in the water-air factor or, what amounts to the same thing, an increase in convection velocity in the reservoir leads to the total transfer of the heat into the region ahead of the combustion front [1–3]. In [3] the area of the heating zone ahead of the combustion front was calculated in accordance with the Marx-Longenheim model [4]. Below, on the basis of exact solutions of model problems it is shown that in the case of quasisteady Newtonian heat transfer between the surrounding medium, when the latter is assumed to be a thermal reservoir, i.e., maintain a constant temperature, this projection of heat is possible if the convection velocity exceeds the velocity of the combustion front. In the case of unsteady heat transfer in accordance with the Leverrier model there is no total projection of heat into the region in question; in the steady-state regime a limited heating zone, proportional in depth to the square of the difference of the convection and combustion front velocities, is formed ahead of the front.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 4, pp. 166–172, July–August, 1987.The author wishes to thank V. M. Entov for his valuable advice and useful discussions.     

Advance in Experimental Mechanics in Asia-2006

In order to offer an opening platform for researchers in Experimental Mechanics community from Asia and other regions to communicate their achievement, the Editorial Committee of Journal of Experimental Mechanics decided to publish an international series…     

Calculation of two-dimensional dispersion in a gas in unsteady flow in a porous medium

A two-dimensional problem of the flow of a gas containing an impurity through a porous medium is considered. At the initial time, the gas containing a uniformly distributed impurity is at a high pressure in a spherical cavity in a porous medium at a certain distance from a flat surface. It is assumed that for t > the motion of the carrier gas is described by the system of equations for flow in a porous medium and the dispersion of the impurity is described by the equations of convective diffusion and nonequilibrium adsorption. A numerical method for solving the problem is discussed. Some results of calculations are given. The influence of the flat surface on the flow of the gas and the dispersion of the impurity is analyzed.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 5, pp. 61–67, September–October, 1982.We thank V. N. Nikolaevskii for comments which permitted a significant improvement in the paper.     

Erosion in conical diffusers in particulate-laden cavitating flow

This paper highlights the serious damage that can occur in diffusing sections of pipework in which a cavitating particulate-laden fluid is flowing. The combined effects of particle erosion and cavitation are shown to remove considerably more material than would be expected from summing the effects of the individual mechanisms. It is demonstrated that, to be sure of avoiding this accelerated surface erosion, the transition from a smaller flow section to a larger one needs to be an abrupt expansion. If pressure recovery is important, a possible design solution is proposed. In the case of swirling flow, the expansion again needs to be abrupt. Evidence was also obtained which showed that, by allowing air to be entrained into the low pressure region in the flow, the cavitation and the erosion can be substantially reduced.