有方法的

In this paper we study the effect of numerical integration in expanded mixed finite element methods for linear elliptic problems.

关于数值积分对椭圆型及抛物型方程有限元方法的影响，已有一些研究，本文考虑了数值积分对扩展混合有限元方法的影响。

This method is local method, and can be appliced to objects with some partial occlusion.

该方法是图像局部识别方法，可以对景物中有部分的遮挡物的物体进行识别。

For all his scientific methods of detection, the only way the oilman can actually know for sure that there is oil in the ground is to drill a well.

对石油工人所有的科学探测方法来说，能确切地知道地下是否有油的唯一方法就是钻一口井。

The representative methods during that time such as the Du Pont System, EVA and BSC, etc.

其间比较有代表性的绩效评价方法有：杜邦财务分析体系、经济增加值、平衡计分卡等。

This thesis also makes the simulation of experiment methods used MATLAB software. The simulations results show that the proposed methods can practicably be used in this experiment.

本文还对文中提出的实验方法作了MATLAB/Simulink仿真，验证了该方法的可行性，对实验有指导意义。

In the past, either about the art theory or during the course of Chinese teaching, the theme comprehension is often analysed extremely and prejudicially for lack of comprehend to the theme intension and significance, so it has been shaped singly and rigidly, ignoring special character of literature significance and spirit of literary texts are hardl...

本文揭示了这样的主题分析的失误所在，进而依据先进的文艺理论提出了适用于语文教学的引导学生正确理解主题的方法，在方法的阐述中，文章用大量作品分析的实例指出了方法运用及具体操作的尺度，旨在帮助学生多方位观照和认识作品的主题，真正理解作品，获得更为丰富的审美感受，发展语文能力，以期对实际教学有指导意义。

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。

"Where there is a will, there is a way," which is a common English proverb.

"有了决心就会有方法，"这是一条常见的英语谚语。

Quadratic interpolation technique and Taylor series are used as CV model of circuits and the relevant methods of model establishment are also proposed.

为了提高精度，减少电路分析次数，近年来出现了一些有效的方法，控制变数法(Control Variates Method，简称CV法)就是其中一种很有发展前途的方法。

Three novel equation-solving methods have been developed to solve the phase stability problem of ternary systems with satisfying robustness and rapidness.

本文提出了三种新的有效相稳定性判断方法，这三种方法各有相应的应用范围和侧重点。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了