查询词典 electric shock

Compared with the initial value problems of scalar conservation laws with smooth flux function, the global weak entropy solutions for the initial-boundary value problems of scalar conservation laws with weak discontinuous flux function include the following new interaction types: a rarefaction wave collides with the boundary and is absorbed compltetely or partially by the boundary; a rarefaction wave collides with the boundary and the boundary will reflect a contact or non-contact shock wave; a contact or non-contact shock wave collides with the boundary and is absorbed by the boundary; a contact or non-contact shock wave collides with the boundary and a new non-contact shock will rebound from the boundary simultaneously or later.

与具有光滑流函数的单个守恒律的初始值问题相比，具有弱间断流函数的单个守恒律初边值问题的整体弱熵解中包括下列新的相互作用类型：稀疏波碰到边界并被边界部分或全部吸收；稀疏波与边界相撞，边界反射出一个接触或非接触激波；接触或非接触激波碰到边界并被边界吸收；接触或非接触激波与边界相撞，边界同时或稍后反射出一个新的非接触激波。

The usual way to calculate the residual shock response spectrum of the base shock response is as follows: the time domain shock response of the base is calculated firstly, then the residual shock response spectrum of the base response is calculated.

冲击作用下设备安装基座响应的冲击余谱的一般计算方法是先计算冲击作用下设备安装基座的时域响应，再计算安装基座响应的冲击余谱。

To obtain a complete picture about shock formation in non-viscous flow, in the succeeding chapter we investigate the isothermal shocks in adiabatic flows. We find that in this case the shock solution still exists, but the structure and the properties of the solution are greatly different from above even qualitatively. In some region of the parameter space there only exists unstable shock solution and in some region of the parameter space there may exist two stable shock solutions.

为得到完整的无粘流体中激波形成的图象，在接下来的第四章，我们研究绝热流体中等温作为激波条件时的情况，发现此时激波解仍存在，但解的结构和性质甚至在定性上都与前两章有了显著的不同：某些参数空间只存在非稳定的激波解，某些参数空间则会同时出现两个稳定的激波解。

The calculated results indicate that a bifurcated A. wave can be formed when the shock passes through the flame, and pre-induced shock transmission in the flame leads to the formation of Mach stem, followed by spheral shock wave. The Rayleigh-Taylor and Kelvin-Helmholtz instabilities occurred in the flame induced by shock wave lead to the flame distortion and breakup.

计算结果表明，激波掠过火团时，分叉形成λ波；前引激波在火团内透射并在轴线处碰撞形成Mach杆，进而逐渐发展为球形激波；火焰在激波作用下先后出现Richtmyer-Meshkov不稳定和Helmholtz不稳定，火焰逐渐变形以致破碎；燃烧速率因此剧增。

However,it is the dissipa-tive mechanism,i.e.the mechanism of energy localization that attracts one′sattention for the problem of shock initiation.Since the test result of shock initia-tion about fine-grain explosive charge does not support hot spot ignition model,the author of this dissertation advances that the mechanism of energy localiza-tion is coincident with phonon-fracton crossover of fractal network for ultra-fine-grained charge and,moreover,analyzes the relation between shock sensi-tivity and porosity,which is consistent with shock Hugoniot curve for porousmaterials.

由于超细颗粒压装炸药的冲击起爆实验不支持热点点火模型，为此、本文提出对于单晶颗粒半径为微米以下量级的药床，冲击起爆的能量局域化机制与分形网络中弱局域化声子向强局域化分形子的渡越对应，并且根据这一机制分析了超细颗粒药床的冲击感度和孔隙度的关系，结果与多孔物质冲击压缩的P-V图吻合。

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。

Such as burning glass electric rice cookers, electric heated glass cookers, electric Niunaibei glass, glass, electric heated rice bags, glass, such as electric ovens

诸如玻璃电热烧锅、玻璃电热暖锅，玻璃电热牛奶杯、玻璃电热恒温电饭包、玻璃电热烤炉等

Such as burning glass electric rice cookers, electric heated glass cookers, electric Niunaibei glass, glass, electric heated rice bags, glass, such as electric ovens A diagnostic radiology, with the ray protective devices, including the limited-hole plate (4), limited-hole plate (1), servo motor, with the upper limit switch (3), limit switch (7), and so on, installed in the activities Bed-shading of the ball before relying on the upper and lower limit switch servo motor control circuits and chain control, automatic transform limited-hole plate position, perspective and point of excess-ray films blocked so that patients and doctors have been reliable protection .

诸如玻璃电热烧锅、玻璃电热暖锅，玻璃电热牛奶杯、玻璃电热恒温电饭包、玻璃电热烤炉等一种放射线诊断时用的射线防护装置，包括方孔限光板（4）、圆孔限光板（1）、伺服电机、上限位开关（3）、下限位开关（7）等，装设在活动床球管遮光器前，依靠伺服电机上下限位开关及控制电路进行连锁控制，自动变换圆孔限光板的位置，将透视和点片时的多余射线遮挡住，使患者和医生都得到可靠的防护。

Such as burning Glass Protective Film electric rice cookers, electric heated Glass Protective Film cookers, electric Niunaibei glass, glass, electric heated rice bags, glass, such as electric ovens

诸如玻璃电热烧锅、玻璃电热暖锅，玻璃电热牛奶杯、玻璃电热恒温电饭包、玻璃电热烤炉等

This is the land of the elec-tric salad dryer, the electric can opener, the electric soap dispenser, the electric air freshener, the electric hair curler, the in-the-shell egg scrambler, and the electric ''.

这是电沙拉干燥器、电罐头起子、电皂液器、电空气清新器、电卷发器、炒蛋器、电拔毛器的国土。

A small, rubber-headed hammer used in examination or diagnosis by percussion.

叩诊槌用在通过''。'振荡'。''所作的检查或诊断中的橡皮头的''。'小'。''槌

Affixes are limited in number in a language, and are generally classified into three subtypes, namely, prefix, suffix, and infix, depending on their position with reference to the root or stem of the word.

语言中词缀的数量总是有限的，根据它们跟词根或词干的相对位置，一般可以把词缀分外三小类：前缀，后缀和中缀。