查询词典 motion study

The study of motion characteristics,electromagnetic characteristics and oscillation characteristics of electrical particles are key composition of the EDM mechanism study.

电火花加工机理研究的相对滞后在一定程度上制约了电火花加工技术的进一步发展；放电通道中带电粒子的运动特性、电磁特性及振荡性的研究是电火花加工机理研究中的重要组成部分。

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。

This paper focuses on the study of launch dynamics for self-propelled artillery. In order to exactly compute the motion of projectile in gun tube and the initial disturbance, the theory of two- phase flow interior ballistic is applied to the study on launch dynamics.

为了更加准确地计算火炮弹丸的起始扰动，将两相流内弹道应用于发射动力学研究。

It can be divided into statics , the study of equilibrium, and dynamics, the study of motion caused by forces.

它可以分为静力学和动力学，前者研究平衡状态，后者研究力造成的运动。。

Firstly, the study of education policies focused on the basic education revolution, school programs, textbooks, and how "A reverse course", which was in the late occupation period, affected education policies change. Secondly, the study of culture policies analyzed theatricals, motion picture censorship and the revolution of religions.

教育政策的研究主要将重点摆在基本教育改革、教科课程、教科书、占领后期「逆反路线」所导致之教育政策转变等；文化政策方面则探讨媒体中对战后日本影响至为深远的演剧、电影检阅及最富争议的宗教改革。

This paper has no intention to put forward the ubiquitous educational principles, but has the intention to look for the educational significance in the situation. Against the way so called "top to down" by which most of the educational study deduct the certain theory, this paper prefers to use the collaboration of the way of "top to down "and the way of "bottom to up", but the preferable way is "bottom to up": I go near the world of the teacher's life, listen to the voice of the teacher, I make an attempt to keep the teacher's real situation, motion, chance and feeling, I welcome to invite readers to give an ear to their stories and understand the teacher's personal practical theory, also, expect me to do tiny but deep-ground task for verbalism in the educational study by standing the position on the Chinese reality.

与当前教育研究中大量的从既有理论框架中推演出某种论点并加以论证的所谓"自上而下"的方式不同，本研究更倾向于采取"自下而上"与"自上而下"相结合并以前者为主的策略：走近教师的生活世界，倾听教师的声音，用叙事的方式尽可能保留实践中的情境、流动、机缘、感受，邀请读者一同倾听故事，并以此为基础展开对教师个人实践理论的理解，也期望通过立足中国现实土壤的研究为教育研究本土化做一点哪怕微不足道却是扎实的工作。

This study demonstrated that DTI could detect difference of the wall motion between endocardial and epicardial myocardium and provide a quantitative analysis to study normal heart and pathologic heart disease.

多普勒组织成像脉冲技术能实时测量心肌各部位的运动速度，为评价正常心肌状态及病理性变化提供了一项无创性技术。

For some typical ship manoeuvring motions in restricted waters, numerical study on simulation of the viscous flow and calculation of the hydrodynamic forces is carried out by solving the RANS equations:(1) Numerical study on the viscous flow and the hydrodynamic forces on a ship in oblique motion in shallow water.

本文针对如下几种典型的限制水域中的船舶操纵运动，通过求解RANS方程，对其粘性流场和水动力进行了数值研究：(1)浅水域船舶斜航运动的粘性绕流场及水动力数值计算研究。

In traditional teaching practice, teachers tend to comfound advanced study with primary study, and analogize primary-study strategies to the stage of advanced study and thus oversimplify teaching and learning.

建构主义者认为，传统教学混淆了高级学习与初级学习之间的界限，将初级学习阶段的教学策略不合理地推及到高级学习阶段的教学中，使教学过于简单化。

Combining the teaching practice of analytical geometry, this article puts forward the implement strategy of instruction of mathematics study: penetrate the principle of mathematics study towards the students; instruct the students how to study; help the students form the better non-intellect factor; develop the student's original cognizance level; present the instruction of mathematics study ; raise the extent of students' participation ; keep the teaching and instruction in harmony and instruct the solution of students' query.

结合立体几何教学实践，本文提出了数学学法指导的实施策略：向学生渗透数学学习方法理念：对学生学习的各环节进行学习方法指导；对学生形成良好的非智力因素进行指导；发展学生的元认知水平；数学学法指导的基本方法；提高学生的智力参与程度；教学与学法指导和谐统一；对学生质疑问难的方法进行指导。

Effective local search tactics reaches local searchers when they are ready to buy - with every way that it is possible for them to buy from you.

有效的地方搜索策略达到当地的搜索，当他们准备购买-以各种方式，这是他们有可能从您那里进行购买。

The first two are periodic sentences for their beginnings; and the fifth and the last are also periodic sentences each for the embedding of a parenthetic structure.

1960年代中后期，当战后女权主义和当时的许多其他抗议运动在西欧和北美发展成某种势力时，性别的概念演绎成补充和延伸生物性别差异的概念。