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In order to reasonably depict four basic problems with friction, one Coulomb friction new form in first Kirchhoff stress is proposed to deal with finite deformation problems, other Coulomb friction form in incremental mode to elastoplastic flow theory; Hilbert function spaces concerning elastoplastical problems with friction are established, so it makes all operations and calculations in the treatise standardized within the scope of reasonably topologic structure; In view of functional extremum, the equivalence between generalized variational inequalities principles in elastoplasticity with friction and corresponding basic problems are testified by inducing Lagrangian multipliers, so it provides a rationally theoretical basis for numerical methods in elastoplasticity with friction; From the viewpoint of variational inequality, the theory of generalized variational inequalities in elasticity and elastoplasticity with frictional constraint is studied, and the uniqueness and existence of the solution of FEM is proofed under the proposed conditions of stress compatibility, and them FEM approximation and a discrete solution are discussed; Based on the principles of generalized variational inequalities in elastoplasticity with friction, direct generalized variational inequalities methods is pretended, which is a natural generalization and development of direct variational methods; Using generalized variational inequalities methods, some examples in metal forming including plane deformation, upset and extrusion are analyzed and the results prove that all the theories and methods in the paper are right, feasible, accurate and advanced.

主要内容有:为了合理地描述金属塑性成形中摩擦约束弹性、弹塑性基本问题,提出和研究了有限变形下以Kirchhoff第一应力表示的Coulomb摩擦定律形式和弹塑性流动理论下以增量形式表示的Coulomb摩擦定律表示形式;系统建立了摩擦约束弹塑性问题的Hilbert函数空间,使本文规范在一个具有合理的代数拓扑结构内进行一切操作和运算;利用Lagrange乘子,从泛函极值的角度系统地阐述和论证了一系列摩擦约束弹性、弹塑性广义变分不等原理与相应的实际问题之间的等价性,它为处理摩擦约束的弹塑性力学数值方法提供了合理的理论基础;从变分不等式的角度出发,阐述了对应于摩擦约束弹性、弹塑性问题的广义变分不等式理论,首次提出了在应力相容性条件下,它的有限元解具有存在唯一性,进而讨论了其有限元近似及离散解法;基于摩擦约束弹塑性广义变分不等式原理,首次提出了直接广义变分不等式方法,这一方法是直接变分法的合理推广和发展;利用直接广义变分不等式方法对金属压力加工中的平面变形问题、镦粗、挤压等塑性成形问题进行了分析计算,验证了该理论和数值算法的正确性、实用性、精确性和优越性。

Based on HNC theory, we put forward a multimodal task specification method.

以HNC理论为指导提出了一种多通道任务描述的方法。

The protologue cited the holotype from Alxa Zuoqi in "Ningxia," although that locality is some 20 km to the west in Nei Mongol.

虽然采集地在内蒙古以西大约20 公里,但是原始描述对主模式的引用为在

In 1686 Robert Hooke of the Royal Society wrote that" A better knowledge of China's civilization would lay open to us an empire of learning, hitherto fabulously described".

年,皇家学会的罗伯特·霍科写道:"更好地了解中国的文明,将为我们打开一个知识的王国,对这个王国迄今只有神话般的描述。"

In 1686 Robert Hooke of the Royal Society wrote that "A better knowledge of China's civilisation would lay open to us an empire of learning, hitherto fabulously described"

1686年,皇家学会的罗伯特·霍克写道:"更好地了解中国的文明,将为我们打开一个知识的王国,对这个王国迄今只有神话般的描述。"

In describing their judgment, Jeremiah was horror-stricken and grieved by what he envisioned:"The destroyer of nations" from the north would swiftly descend upon Judah and Jerusalem, destroying and plundering every city and fruitful field.

当耶利米想像到从北方来的「列国毁灭者」会迅速临到犹大和耶路撒冷,要毁灭和劫掠每个城邑和果园的情况时,他描述他们要受的审判,心中为恐怖所打击忧伤不已。

Wolters regarded his mother as "a highly practical woman, full of zest for life, who in hard times thought nothing of serving a delicious roast without letting on it was horsemeat".

沃尔特斯在他个人出版的回忆录《生命的片段》中,描述他的父亲"严肃、认真而又勤勉,总是对未来充满担忧",而母亲"非常实际,对生活充满热情,生活困难时,她总是为我们做一顿美味的烤肉,却不透露那其实是马肉"。

In his Culture and Anarchy , Matthew Arnold writes,"The great men of culture are those who have had a passion for diffusing, for making prevail, for carrying from one end of society to the other, the best knowledge, the best ideas of their time; who have laboured to divest knowledge of all that was harsh, uncouth, difficult, abstract, professional, exclusive; to humanise it, to make it efficient outside the clique of the cultivated and learned, yet still remaining the best knowledge and thought of the time, and a true source, therefore, of sweetness and light."

马修·阿诺德在《文化和无政府状态》一书中这样描述:"伟大的文化人是这样一些人,他们具有一种激情,要将他们时代最好的知识、最好的思想从社会的一端传播和搬运到社会的另一端,使之流行不衰;他们殚精竭虑,要为知识去除一切粗糙的、粗野的、难解的、抽象的、专业的和孤傲的成分,要把它人性化,使它在绅士和学者的圈子之外,也见成效,与此同时,又保留了时代最好的知识和思想,因而成为甜美和光明的真正源泉。"

The results showed that the flow behavior of 2124 aluminum alloy was described by the hyperbolic sine constitutive equation, and an activation energy of 170.13 kJ/mol was calculated.

结果表明:2124铝合金热变形过程中的流变应力可用双曲正弦本构关系来描述,平均激活能为170.13 kJ/mol。

These pulses include a Gaussian pulse, a hyperbolic secant pulse, a Lorentzian pulse, a Poisson spectrum pulse, a asymmetrical hyperbolic secant pulse, a rectangular pulse, a chirped Gaussian pulse and a chirped super-Gaussian pulse.

本论文基于上述提及的基本概念、分析方法和衍射积分理论,以描述超短脉冲光束的数学物理模型(包括超短脉冲高斯光束、超短脉冲贝塞耳—高斯光束、超短脉冲拉盖尔—高斯光束和超短啁啾脉冲光束等)为主要研究对象,研究超短脉冲光束在自由空间、色散介质和通过光阑的传输特性和位相奇点附近的光谱异常行为。

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The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。

The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.

聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力