现代科技发展对实验力学带来的挑战和机遇--中国科协青年科学家第75次论坛会议简介

由清华大学、东南大学、天津大学、国防科技大学共同发起和中国科协主办的第75次青年科学家论坛(现代科技发展对实验力学带来的挑战和机遇)于2003年8月4日至5日在北京中国科学会堂召开.来自全国各科研院所、大专院校力学、材料、物理、化学、生物等学科的25名青年科学家参加了此次活动.中国科协李慧政处长为本次活动的致欢迎词,中国科协书记处书记冯长根教授、中国科协常委、中国力学学会副理事长杨卫教授、科协学术部主任马阳教授、中科院力学所白以龙院士、清华大学温诗铸院士、戴福隆教授、以及国家自然科学基金委数理学部力学处孟庆国处长出     

21世纪重大工程中的关键动力学、振动、控制问题及其发展战略'论坛介绍

中国科协主办的第40次“青年科学家论坛”,于1999年5月24日和25日在北京中国科技会堂举行．论坛以“21世纪重大工程中的关键动力学、振动、控制问题及其发展战略”为主题,27位相关领域的有代表性的青年专家、学者参加了此次活动．中国力学学会原理事长郑哲敏院士作了题为“展望21世纪力学”的特邀报告,中国力学学会副理事长陈滨和杨卫教授到会并讲话,受到各位代表的热烈欢迎．中国科协学会部周济副部长,国家自然科学基金委员会靳征漠研究员等参加了本次论坛活动．以Newton力学、Lagrange体系、Hamilton体系为代表的一般力学,建立在…     

中国科协第9次“青年科学家论坛”纪要（节录）

中国科协第９次“青年科学家论坛”纪要（节录）中国科协第９次“青年科学家论坛”于１９９６年５月在北京举行．由清华大学杨卫教授，郑泉水教授，中国矿业大学谢和平教授，中国科学院力学研究所洪友士研究员担任执行主席．“论坛”分为３个报告单元和２个讨论单元，报告...     

现代力学与中国的基础建设和高新技术研讨会——中国科协第9次“青年科学家论坛”

现代力学与中国的基础建设和高新技术研讨会——中国科协第９次“青年科学家论坛”（１９９６年５月２５—２７日,北京）由清华大学工程力学系杨卫教授和郑泉水教授发起的以“现代力学与中国的基础建设和高新技术”为主题的中国科协第９次“青年科学家论坛”于１９９６年...      

中国科协第235次青年科学家论坛简介————-极端复杂测试环境下实验力学的机遇与挑战

由中国科协主办、中国力学学会和北京交通大学共同承办的``中国科协第235次青年科学家论坛'于2011年5月27$\sim$29日在北京交通大学召开.本次论坛的主题为``极端复杂测试环境下实验力学的机遇与挑战', 论坛主席由北京交通大学王正道、中国科学技术大学龚兴龙、国家特种设备检测研究院丁克勤和清华大学冯雪共同担任.      

‘99全国固体力学学术会议税简介

１会议概况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。中科院力学所的王自强研究员和哈工大复合材料研究所的杜善义教授共同主持了会议．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,其中包括中科院院士、清华大学教授黄克智,中科院院士、中科院力学所研究员、中国力学学会理事长白以龙,中国工程院院士、哈尔滨建筑大学教授王光远,中国工…     

第三届"二十一世纪的实验力学学科发展-海峡两岸实验力学研讨会"会议纪要

由中国力学学会实验力学专业委员会主办,内蒙古工业大学协办的第三届"二十一世纪的实验力学学科发展-海峡两岸实验力学研讨会"于2009年7月28日在内蒙古呼和浩特举行.本次研讨会由来自清华大学(北京)、天津大学、中科院力学所等大陆10所院校和科研单位的15名一线学者、教授等高层次青年科学家和工程专家,与来自台湾清华大学、成功大学等10所院校和科研单位的16名学者进行了广泛地交流.大会由内蒙古工业大学邢永明教授主持开幕式,天津大学亢一澜教授、清华大学(新竹)王伟中教授分别致辞.     

2008年海峡两岸力学交流暨中学生力学竞赛夏令营活动纪要

由中国力学学会、周培源基金会以及台湾省力学学会共同主办的“2008年海峡两岸力学交流暨中学生力学竞赛夏令营”活动于2008年7月14-21日在台湾举行,由中国力学学会副理事长刘人怀院士任团长,清华大学附属中学校长王殿军教授任副团长的大陆访问团一行30人参加了此次交流活动,访问团中教师15人（北京2人,上海3人,湖南1人,西安6人）,学生15人（湖南2人,上海6人,北京2人,西安5人）．     

关于撰写科普文章,宣传力学贡献的倡议信

本期新设立的这一“科学家谈力学”小栏目,是响应曾先后担任过中国力学学会理事长的钱令希、郑哲敏、王仁、庄逢甘、白以龙等５位院士“关于撰写科普文章,宣传力学贡献的倡议信”,为两院院士和资深教授用深入浅出的方式宣传力学对科学、技术、国防和经济建设所做的贡献,提供一个发表的园地．下面刊登的“倡议信"和王仁院士的文章,就作为本栏目的开篇．     

中国力学学会员2000年、2001年国际、国内学术活动计划(续)

本期新设立的这一“科学家谈力学”小栏目,是响应曾先后担任过中国力学学会理事长的钱令希、郑哲敏、王仁、庄逢甘、白以龙等５位院士“关于撰写科普文章,宣传力学贡献的倡议信”,为两院院士和资深教授用深入浅出的方式宣传力学对科学、技术、国防和经济建设所做的贡献,提供一个发表的园地．下面刊登的“倡议信"和王仁院士的文章,就作为本栏目的开篇．     

Hydraulic modeling of the flow in the delta of the River Neva and in the eastern part of the Gulf of Finland

In connection with the construction of Leningrad's flood defenses the flow in the mouth of River Neva has been investigated on hydraulic models of different scales both unpressurized (see, for example, [1, 2]) and pressurized (see, for example, [3]). Since the results of these investigations are being intensively debated in connection with the discussion of the effect of defensive structures on the ecology of the Leningrad region, it is important to analyze the scientific basis for the hydraulic modeling of such flows.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 5, pp. 57–65, September–October, 1990.     

Changes in the experimentalist's role in the future of mechanics

At present there exist considerable opportunities for experimental studies. In large part this prognosis derives from the observation that analytical capability has, to some extent, outstripped our detailed understanding of many aspects of engineering concerns, so that there exists a need for providing input into the modeling of mechanics (of materials) problems. This favorable situation is supported by increasingly sophisticated experimental methods which, in turn, depend heavily on the computer, as well as on optical and other field methods. Examples are given that illustrate the gradual transition of macroscopic material related studies to those that require submicron resolution as demanded by ever increasing relevance in advanced materials related research. Paper was invited lecture at the 1995 SEM Spring Conference on Experimental Mechanics held in Grand Rapids, MI on June 12–14.     

Influence of the macrotransport processes in gases on the change in the hydrodynamic parameters in the presence of a resonance radiation pulse

The effect of a resonance radiation pulse on the gas parameters is investigated. It is assumed that the pulse duration is large enough for the diffusion and heat conduction to be taken into account. It is shown that the diffusion and heat conduction may be significantly influenced by the processes of excitation of the internal degrees of freedom of the molecules.Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No.4, pp. 120–128, July–August, 1992.     

Symmetrization of the tensor operator of the compatibility equations in stresses in the anisotropic theory of elasticity

The general form of the term whose addition to the left-hand side of the compatibility equation in stresses in anisotropic elasticity symmetrizes the rank four differential tensor operator of these equations is obtained. In the case of an arbitrary type of anisotropy, this term contains two arbitrary parameters of dimension of elastic compliances. The symmetrized compatibility equations themselves contain only one of these parameters, and the combination of the terms with this parameter can be separated from the terms containing the tensor of elastic compliances.     

Criterion of Hyperbolicity in Hyperelasticity in the Case of the Stored Energy in Separable Form

We consider the equations of hyperelasticity for isotropic solids in the Eulerian coordinates in a special case where the specific stored energy is a sum of two functions. The first one, the hydrodynamic part of the energy, depends only on the solid density and the entropy, and the second one, the shear energy, depends on the invariants of the Finger tensor in such a way that it is unaffected by the volume change. A new sufficient criterion of hyperbolicity for such a system is formulated: if the sound velocity is real and a symmetric 3×3 matrix determined in terms of the shear energy is positive definite on a one-parameter family of surfaces of the unit-determinant deformation gradient, the equations are hyperbolic.     

The evaluation of the surface impedance in the theory of the anomalous skin effect in metals

Summary A simple method is described for obtaining series expansions for the integrals which represent the surface impedance in the theory of the anomalous skin effect in metals. The results agree with those recently obtained by Dingle¹) by means of an intuitive procedure.     

Modeling the disturbances in the lake Chebarkul caused by the fall of the meteorite in 2013

The results of numerical simulation of the possible hydrodynamic disturbances in lake Chebarkul caused by the fall of the meteorite in 2013 are presented. In the calculations the system of Navier–Stokes equations is used. The entry of the meteorite into the water at an angle of 20° is modeled. The numerical experiments are performed both with and without account for the ice cover of the lake. The dimensions of the ice cover disruption are evaluated. The dimensions of the ice-hole observable in the place of the meteorite fall are shown to be in good agreement with the theoretical predictions and the preliminary estimations.     

Generalized logistic growth modeling of the COVID-19 outbreak: comparing the dynamics in the 29 provinces in China and in the rest of the world

Nonlinear Dynamics - Started in Wuhan, China, the COVID-19 has been spreading all over the world. We calibrate the logistic growth model, the generalized logistic growth model, the generalized...     

Changes in the type of the shock-wave structure in high-velocity flows

Physical aspects of nonuniqueness of shock-wave structures in supersonic and hypersonic flows are considered. Thermodynamic conditions determining the dual solution domains are analyzed, and the boundaries of the transition from Mach to regular reflection are examined.Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 46, No. 2, pp. 23–32, March–April, 2005.