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To establish the constitutive equation of material, the metric tensor for stress , strain and their transformation equations between different configurations are derived, and basic theory of finite deformation as well as elasto-plastic deformation criterion are studied. By analyzing the applicability of different element models, four-node quadrilateral degenerated Mindlin isoparametric element is adopted because of its good versatility, and the element stiffness matrix is derived. The static implicit elasto-plastic finite element equation for complex skin stretch-forming is put forward based on Updated Langrange formulation.

本文首先系统地阐述了有限变形的相关基本理论,针对板料成形建立了应力应变度量张量及其相应的转换关系;介绍了材料的屈服准则、塑性变形强化规律、塑性流动规律以及加、卸载准则,并在此基础上建立了有限变形各向异性弹塑性本构方程;对板料成形的单元模型进行了分析,针对飞机蒙皮零件特点,采用通用性强的四节点四边形退化Mindlin等参壳单元进行成形模拟,并导出其单元刚度矩阵的具体形式;基于以上研究,以逐级更新Langrange描述的持续虚功率原理为基础,建立了率形式的复杂蒙皮拉形过程静态隐式弹塑性有限元方程。

The microeconomic base of macroeconomic control is different from that of macroeconomy.

内容提要宏观调控的微观基础与宏观经济的微观基础是两个不同层次的问题。

By employing modern techniques achieved by physics, chemistry and molecular biology, the basic life of cell are shown from different layers ( micrological, sub-micrological and molecular level ).

在我国基础科学发展规划中,细胞生物学与分子生物学、神经生物学和生态学并列为生命科学的四大基础学科,它可以为各种生物工程如细胞工程、基因工程、蛋白质工程等打下坚实的理论基础

The question then arises: how do these novel fundamental properties relate to the already acknowledged fundamental properties of the world, namely those invoked in microphysics?

问题于是提出:这些奇怪的基础属性是如何关联于那些已经被承认的基础属性的?即那些在微观物理学中被承认的?

As the mine accidents happen frequently in recent years, the detecting technology for microseism becomes much more important. However, there is no advanced microseism detecting system at home. It's pretty important for microseisms denoising and Reversion. A wavelet denoising method is presented here to process microseism signal, and the microseism record can get high signal to noise ratio. Meanwhile based on the software of LabVIEW, s design of real-time detecting system for microseism based on virtual instrument is presented. The advantage of the virtual instrument was sufficiently exerted to achieve the real-time detecting and analyzing of the microseism.

以往基于DSP或其他单片机的微震系统,其资源的有限性很难达到理想的采集效果,同时也难以完成先进算法的实现,而对微震信号的去噪与还原在监测系统中起着很重要的作用;在深入分析小波变换的信号去噪方法基础上,对微震信号进行了处理,得到高信噪比的微震记录,实现了对噪声的有效抑止;同时在LabVIEW平台软件设计的基础上,实现了一种基于虚拟仪器微震实时检测的设计方案,充分发挥了虚拟仪器的优势,结果表明基于LabVIEW的微震系统能很好地完成实时监测及其分析。

From the infrastructure, our country's cities are middling and hold definite base to compete.

基础设施看,我国城市居中等水平,具有一定的竞争基础

Undergraduate education is the foundation of military academy education as well as military talents growing and developing.

本科教育是军队院校教育的基础,也是军事人才成长发展的基础

One reason is that the model is an algebra method and it is based on the theory of minimal element. It can give more credible proof. Another reason is that the model tries to prove security of protocols, rather than check them. Thirdly, the model is simple and easy to use, and proof can be finished by manual. Moreover, graphic description makes its proof more comprehensible. Fourthly, there is much research work related to the model, which gives me a good springboard.

首先,该模型是一种代数方法,以极小元等理论为基础,可以给出可信度较高的证明;其次,该模型不是验证协议,而是试图证明协议的安全性;第三,该模型简单、易用,可以手工的方式完成证明,而且图形表示使其证明更加直观;第四,关于该模型有许多相关的研究工作,这为进一步工作打下了良好的基础

Accordingly, an optimistic data consistency maintenance method based on key-attributes is proposed. In the method, the update of key-attributes is separated from user update requests. Key-Updates are propagated by latency-overlay update propagation model, that is, updates are always propagated to the nodes having maximum or minimum latency, and assured and uncertain propagation paths of updates are all taken into account. Based on classifying key-update conflicts, a double-level reconciling mechanism including buffer preprocessing and update-log processing is applied to detect and reconcile conflicts, and then conflicts are solved by policies as last-writer-win and divide-and-rule. Lastly, update-log management method and maintenance method brought by node failure and network partitioning are discussed for the above is deployed based on the information storied in update-log.

在该方法中,首先分离出用户提交的更新请求中关于关键属性的更新;然后采用基于延迟-覆盖的更新传播模型进行更新传播,即基于副本间的网络延迟选择具有最大和最小网络延迟的结点转发更新,并在传播过程中记录和综合考虑更新的确定传播和不确定传播两条路径;在对关键更新冲突分类的基础上,采用更新缓冲区和更新日志两层更新协商机制并结合最新写胜出和分而治之规则,优化关键更新冲突的发现和解决;更新日志信息是方法中各种策略开展的基础,讨论了更新日志中信息管理方法以及结点失效和网络划分发生时信息的维护方法。

Based on practical study of teachers' work,educational research,continuing education,statue quo of students' study activity and home educational environment of Kangle Middle School in Gansu province and careful analysis to firsthand material,the existing problem can be gotten,and some good suggestions that in what way to strength teacher's organization building,how to strength educational reform and strength student's ability to study in an active way,concerned countryside middle school especially to minori...

在对甘肃康乐县中学教师的教学、教育科研、继续教育,学生学习现状,以及家庭教育等方面实地考察的基础上,通过对所掌握的第一手资料的分析,发现存在的问题,并就农村中学,尤其是少数民族地区的中学教育如何进一步加强师资队伍建设、深化教育教学改革、增强学生自主学习能力等提出相应的对策与建议,期望为促进新农村建设奠定良好的基础

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推荐网络例句

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务,乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐,因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。

Closes the eye, the deep breathing, all no longer are the dreams as if......

关闭眼睛,深呼吸,一切不再是梦想,犹如。。。。。。