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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。

Taiwan problems aren"t the simple channel intercoastal relations problems. The forming and transforming are because of the US"s long intervention. The USs intervention brings mistakenly on the expanding and strengthening the forces of Taiwan independence. So Taiwan problems are also Sino-American relations problems.

台湾问题不是简单的海峡两岸关系问题,它的形成与演变是美国的长期介入造成的,对当今的台湾政局的发展以及台独势力的加强,美国更是难辞其咎,因此台湾问题又是中美关系问题。

These situations are the main character of Chinese credit rationing phenomena. It could be conclude that a great mummer of important problems, which including some macro-scale problems such as the dualistic financial structure, the inefficiency of fund allocation, the phenomena of regulation of interest rate, and some middling scale problems such as the banking industry structure, the rampart of entering and exiting banking, as well as some micro-scale problems such as non-performing loans of banks,'over investment' of state-owned enterprise, credit deficiency of enterprises, have concerned with the situations.

一方面,从微观层面来看,政府行政权利在资源配置中的主导作用是中国特色信贷配给现象的一个主要的组成部分;可以说,无论是宏观方面的二元金融结构、资金配置效率低下、利率管制等现象;中观方面的银行业市场结构、银行业进入以及退出壁垒;还是微观方面的某些痼疾,如银行不良资产、国有企业的"过度投资"、微观主体信用缺损等,都在一定程度上同政府主导的信贷配给有关。

Here mainly introduces five natures of the initial value problems, In several aspects summed up as the following : whether there are solutions to the problems, whether the only solution, the existence of solutions interval extent; Initial issues under what conditions have a solution--Cauchy - Piano existence theorem; how the district between the definition of a solution to open up a larger interval up; initial value problems for the sole condition --- Lipschitz conditions; 3、the numerical solution of the initial value problems of Ordinary Differential equations .

在这里主要介绍了初值问题的5个方面的性质,分别在这几个方面中总结了以下内容:初值问题是否有解,解是否惟1,解的存在区间有多大;初值问题在什么条件下有解----柯西-皮亚诺存在定理;怎样把在小区间上有定义的解开拓到较大的区间上去;初值问题解的惟1性条件---李普希茨条件;3:常微分方程初值问题的数值解法。

Results (1)Relevance rate of behavioral problems in type 1 diabetes group was 20.2%,two fold significantly higher than that in the control group(8.2%)(P=0.000).(2)Logistic analysis showed that risk factors concerned behavioral problems in diabetic children and adolescents included patients lived in rural areas,poor parents' marital relationship,poor parent- child relation,improper cultural ways,poor communication and understandings between family members,uniparental family and poor control of blood glucose.(3)It was found that diabetes was the most significant risk factor affected the occurrence of behavioral problems among all related factors based on the analytic results in both the type 1 diabetes group and the health group.Conclusions (1)Children and adolescents with type 1 diabetes are the high- risk population who are apt to the occurrence of behavioral problems.

结果①行为问题的检出率:糖尿病患儿检出率为20.0%,与健康对照组(8.2%)比较,糖尿病患儿行为问题检出率高于健康对照组P=0.000;②Logistic回归分析显示,与糖尿病患儿行为问题有关的危险因素分别为在农村生活、双亲关系紧张、亲子关系差、缺乏直接感情交流、教育方式不当、对子女了解较少、仅由父母中的一方承担管理子女的责任及血糖控制不良;③将健康对照组与1型糖尿病组综合分析后发现:影响行为问题发生的所有危险因素中,患糖尿病的相对危险度最大。

Later, as a member of an after-school science club, I was challenged to solve problems about the natural world by experimentation, initially by repeating already known experiments but later by being required to design new ways to solve the puzzles I had raised.

开始是重复已经做过的实验,随后就要求我设计新的实验方法来解决我自己提出的难题。这是极富挑战性的。在任何时候,创新思维都是最宝贵的。

In the light of cost index and pollution degree, the characteristics of kinds of pulp are analyzed in detail, and the GP pulp which is low cost, high-yield, no-pollution is chosen as the material of tableware. Based on material element analyzed, shaping technology is designed, the to and for single plane shaping equipment which is high shaping quality, high production efficiency and is easy to automatize is chosen. All kinds of measure are taken to solve the problems which are inequality in the shaping process of GP pulp, and dosage which matches with GP pulp is chosen. Some ways of fixing shape and heat up are analyzed, the technology of saving energy of heat pressing to fix shape being composed of oil heat and only one fixed shape in the mold is applied, with which it is high production efficiency, low cost to fix shape effectively, which saves energy 30 percent. In order to make the production line meet with material of GP pulp, measure are taken to solve the problem of pulp adhered to netlike molding which can lead to carry material difficult, the structure of fully automatic equipment is renovated, the loaded beam is optimizationally designed to make equipment structure compactand improve location precision and products quality. According to technologic flow and actual characteristic, Omron PLC is chosen as the core of the control system, proximity switch as detect unit take the place of touch switch, software is designed reasonably according to time order figure, hardware is simplified, the reliability of system is advanced, the stability of system is assured to make production order. Intelligence neuron PID system is studied theoretically which is made up of both neuron with self-organizing and self-learning function and ordinary PID with the characteristic of the simple structure and high stability, which can automatically tune the parameter with the change of system parameter, remain perfect performance.

按成本指标和污染程度分析各浆料的特点,选择低成本、高得率、无污染的磨石机械浆为原料,在原料组分分析的基础上,设计成型工艺,选择成型质量好、生产率高、易实现自动化的往复式单板成型机,采取各种措施解决GP浆成型不均匀的问题及选择与机械浆相匹配的助剂;分析几种定型方式和加热方式,采用定型效果好、生产率高、成本低的油加热与模内一次性定型相结合的热压定型节能技术,节能30%;为了使生产线适应磨石机械浆原料,采取相应措施解决由于粘网造成物料转移困难,对全自动设备结构进行改进设计,着重对物料传送系统的关键部件——承载梁的进行优化设计,使设备更加紧凑合理,提高设备的定位精度和产品质量;根据生产线工艺流程和现场特点,选用OMRON CPM1A型PLC为主核心,接近开关作为检测元件,替代有触点开关,选用可编程终端代替常规面板按扭,并按照时序图科学合理地设计软件,有效地简化系统硬件构成,提高系统的可靠性,保证系统的稳定性,从而使生产更加通畅有序;从理论上探索将神经元应具有的自组织、自学习要求与PID控制结构简单、稳定性好的全自动纸浆模塑餐具生产线的研究特点结合起来,构成神经元自适应PID控制器,当参数的变化时,系统能自行参数整定,保持优良的工作性能指标,满足实际需求。

Compilation of the plane trigonometry and spherical trigonometry book, spherical trigonometry to solve some problems in, and first proposed the introduction of auxiliary angle method to solve the triangle .

编撰了有关平面三角学和球面三角学的著作,解决了球面三角学中的若干难题,并首先提出引进辅助角的方法解三角形。

Compilation of the plane trigonometry and spherical trigonometry book, spherical trigonometry to solve some problems in, and first proposed the method to solve the introduction of auxiliary angle triangles .

编撰了有关平面三角学和球面三角学的著作,解决了球面三角学中的若干难题,并首先提出引进辅助角的方法解三角形。

In constructivist theory, under the guidance of the network to overcome the traditional teaching essay writing teaching many lack the advantages of network technology to solve the traditional composition of a series of their own can not solve problems, compared with the traditional composition, showing a very significant advantage.

在建构主义理论指导下,网络作文教学克服了传统作文教学的多方面不足,网络技术优势解决了传统作文自身无法解决的一系列难题,与传统作文相比,显示出了十分显著的优势。

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推荐网络例句

Don not attempt to do something which you can not to do.

不要企图做那些办不到的事情。

The expression of CTGF and TNF-αweredetected by immunochemistry and the number of Clara Cells was calculated.

光镜下观察肺组织的病理变化,采用免疫组化染色观察肺组织中结缔组织生长因子和肿瘤坏死因子-α的表达和Clara细胞的数量。

The latest results are published online January 13 in the Journal of the National Cancer Institute. They come from a case–control study that involved 459 cases,"which, for the rarity of this cancer, is a very big study," Dr. Stang said.

Stang医师表示,这项最新的研究结果线上发表在1月13日的国家癌症机构期刊上,研究来自一项收纳459个病例的病例控制研究,这是一项非常大的研究。