必要性

He said the new world order would be driven by "the compelling necessity of the principle of the freedom of choice".

他表示，新的世界秩序将受到"自由选择原则这一无可辩驳的必要性"的推动。

Chapter I make the German blueprint for the concept and content of the principle of proportionality elaborated, and their three sons principles; the proper principle, the balanced principle and the principle of the need for a comparison of the relationship.

本章首先以德国为蓝本对比例原则的概念以及内涵进行了阐述，并对其三个子原则：妥当性原则、必要性原则以及均衡原则的关系进行了比较。

The writer passes the contrast example the creation and development,content of principle,abroad the administration method in of apply and the treatise of the value of the comparison principle inquiried into an our country the administration rule of law construction to draw lessons from of the necessity and the possibility of comparison principle.

笔者通过对比例原则的产生与发展、内涵、在国外行政法中的适用及比例原则的价值的论述探讨了我国行政法治建设借鉴的比例原则的必要性与可行性。

The principles of conviction include both of the principles of procedural law and of the principles of substantial law,the former involves principle of procedure according to laws,principle of evidence judging, principle of innocence presumption;the latter involves principle of conviction according to laws,principle of correspondence between subjectivity and objectivity,principle of necessity.

定罪的原则包括程序法原则与实体法原则两大组成部分，定罪的程序法原则为程序法定原则、证据裁判原则、无罪推定原则；定罪的实体法原则包括罪之法定原则、主客观相统一原则、必要性原则。

In this topic, the dynamic analysis methods for piezoelectric vibrator are studied systematically based on the theoretical model, FEM numerical experimentation and FEM governing equation for given compound-mode vibrator, and some valuable conclusions are obtained. The main work accomplished is summarized as follows: 1.Elaborate the main modeling methods for piezoelectric vibrator and the significance and necessity to study the dynamic characteristics of piezoelectric vibrator which emphasize the urgency of this paper. 2.Take the bending deformation induced by piezoelectric ceramic as example, the energy transfer mechanism of electric energy to mechanical energy are analyzed; the motion and force transfer mechanism are analyzed for the longitudinal-bending vibrator. 3.Based on mode assumption and Hamilton principle, the coupling model of piezoelectric vibrator of linear USM is built; moreover, the equivalent circuit model is obtained and a coupling equation represents the relation between electric parameters and mechanical parameters is derived which provides foundation to match the vibrator and driving circuit. 4.Combine the constitutive equation of piezoelectric ceramic with elastic-dynamical equation, geometric equation in force field and the Maxwell equation in electric field and the corresponding boundary condition equation, the FEM control equation for piezoelectric vibrator of USM to solve dynamic electro-mechanical coupling field is established by employing the principle of virtual displacement. The equation lays the foundation to study the non-linear constitutive equation of piezoelectric ceramic driven by high-power. 5.Define the dynamic indexes of characteristic of vibrator and carry out variable parameters simulation by calculating the model parameters and the electric characteristics of vibrator are simulated according to the equivalent circuit model. By numerical experimentation, the working mode of vibration of vibrator and the shock excitation results of the working frequency band which provides the mode frequency to realize bimodal are analyzed. Detailed calculation of the electro-mechanical coupling field parameters is made by programming the FEM control equation.

本课题从理论模型、有限元数值试验、有限元控制模型等方面以复合振动模式振子为例对超声电机压电振子的动力学特性及其分析方法进行了全面系统地研究，得出了许多有价值的结论，主要概括如下： 1、阐述了目前针对超声电机压电振子的主要建模方法，对压电振子动态特性的研究意义和必要性进行了论述，突出了本文研究内容的迫切性； 2、以压电陶瓷诱发弹性体发生弯曲变形为例，分析了压电陶瓷通过诱发应变来实现机电能量转换的机理；对基于纵弯模式的压电振子的运动及动力传递机理进行了分析； 3、基于模态假定，利用分析动力学的Hamilton原理，建立了面向直线超声电机压电振子的机电耦合动力学模型，并据此建立了压电振子的等效电路模型，导出了电参量与动力学特性参量的耦合方程，为压电振子与驱动电路的匹配提供了依据； 4、从压电陶瓷的本构方程出发，综合力场的弹性动力学方程、几何方程、电场的麦克斯韦方程以及相应的边界条件方程，采用虚位移原理，建立了压电振子动态问题机电耦合场求解的有限元控制方程，为研究其大功率驱动下的非线性本构模型奠定了基础； 5、界定压电振子的动力学特性指标，对压电振子的机电耦合动力学模型参数进行计算及变参数仿真；依据等效电路模型，对压电振子的电学特性进行了仿真分析；通过有限元数值实验，对压电振子工作模态附近的模态振型及工作频率附近的频段进行了激振效果分析，找出了实现模态简并的激振频率；利用有限元控制方程，通过编程计算，对压电振子的力电耦合场参数进行了详细计算，得出了一些有价值的结论。

Moreover, this paper discusses the probability and necessity of forming Chinese characteristic spatial school.

本文在归纳、整理、分析国内现有各种空间结构模式的基础上，对其进行了体系化归类的尝试，并探讨了形成有中国特色的空间学派的必要性和可能性。1 国内关于空间结构模式研究的主要

According to its features and the tourism trend,this paper analyses the probability,the necessities and the measures of developing countryside tourism in Langshang scenic spot.

结合我国旅游发展趋势以及山自身的特点分析了山发展乡村旅游的可能性、必要性和措施。

The second one analyses the law basis, design, judicial practice and general situation of personnel of the existing civil procurator system of our country.

第二章，进一步从法律依据、制度设计以及目前的司法实践和队伍状况等层面对我国民事检察监督制度进行了理论分析，阐述了民事检察监督存在的必要性及其自身存在的独立价值。

In this paper, the necessity of designing prod uct in concurrent way is proposed by analyzing the product development process.

通过对产品开发过程的分析，指出了并行产品开发过程的必要性。

The difference and relationship among design feature、machining feature and FEM feature are clearly presented. The necessary of feature mapping in product concurrent design system is discussed, and its theory and method are systematically studied.

详细分析了特征信息在产品生命周期中各应用环节的重要作用，揭示了设计特征、工艺特征以及分析特征的本质区别和内在联系，讨论了特征变换的必要性和特征变换的理论方法，指出建立一种柔性的特征表示模型，开发基于约束和参数驱动的特征造型系统，能方便的实现不同应用特征之间的变换，是实现CIM和CE的关键技术。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。