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In recent years,impressive progress has been made in research on organic electroanalysis,organic electrosynthesis, organic photoelectrochemistry and organic electrocatalysis.

近年来，有机电化学在有机电分析，有机电合成，有机光电化学，有机电催化等方面的研究都得到了快速的发展。

According to analysis of roots locus,fast excitation tends to decrease damping of power systems which is controlled by AVR than slow excitation.But eigenvalues of power system are far from imaginary axis and strong damping is obtained when fast excitation system is added.

在高放大倍数的AVR控制下，快速励磁较慢速励磁更容易恶化系统阻尼；但是在同时附加励磁控制的情况下，快速励磁可使系统的机电模式根轨迹远离虚轴，机电模式阻尼较大；而慢速励磁下，系统机电模式根轨迹接近虚轴，机电模式阻尼较小，快速励磁优于慢速励磁。

The mapping between performance knowledge unit and mechatronical product structural is set up.According to the perfect mapping relationship,superfluous mapping relationship and coupling mapping relationship,the solution of mechatronical product design problem is proposed.

在机电产品性能知识语义描述的基础上，扩展出机电产品性能需求集的语义描述方法，建立结构性能知识单元与机电产品实例结构的映射关系，分别根据理想、冗余和耦合映射关系，提出机电产品结构设计的求解方法。

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。

Due to reassembly and maintenance,the reliability model for mechanical equipment is broken,so it is necessary to research and estimate the safety reliability of mechanical system.

基于机电系统中零件的失效时间分布密度函数，研究了在重组维护过程中机电系统服役期间零件年龄结构的分布规律，发展了机电系统可靠性数学模型。

By using the combined support technology of concrete sprayed anchored net,anchorage cable and backwall grouting in the mechanical and electronic underground chamber of Shuangmiao extending area of Gedian Mine,Shenhuo Coal and Electricity Joint-stock Company,the tunnel condition is effectively improved,the deformation of the surrounding rock is inhibited.

介绍了根据硐室布置的岩层和地质条件及机电硐室设备布置的具体要求，神火煤电股份有限公司葛店煤矿双庙扩大区井底车场机电硐室成功采用锚网、锚索、壁后注浆联合支护技术；实现了多次支护的抗压作用，保证了大断面机电硐室的有效施工，确保了机电设备的安全运行。

In Chinese mainland, is a company specialized in the manufacturing of electromechanical products.

广州市伊东机电有限公司是香港伊东机电有限公司在国内的生产厂家，是一家生产机电产品的专业公司。

In order to strengthen the management on old major mechanical and electrical product, old mechanical and electrical products (see the appendix for detailed catalogue) relating to production safety, personal safety (electric appliances, medical apparatus and instruments) and environmental protection (engineering and Vehicle and ship craft machinery), as well as those quota, specially designated, or unifiedly registered (including those old mechanical and electrical equipment provided by foreign investors in foreign investment and processing trade enterprises), shall be dealt with according to the Notice on Strengthening Management on Imported Old Mechanical and Electrical Products Guo Jing Mao Ji No.

一、为加强对重点旧机电产品的管理，对涉及生产安全、人身安全和环境保护的旧机电产品及配额、特定、集中登记的旧机电产品（包括外商投资和加工贸易企业由外商无偿提供进口的旧机电产品）仍按《关于加强旧机电产品进口管理的通知》（国经贸机〔1997〕877号）办理。

Is a professional production of large-scale explosion-proof heaters, high temperature heat pipetemperature Electrical, mechanical and electrical cellular heat pipe dehumidification drying, central air-conditioning fan coil heater, heating tube electric reflow wave soldering wire,, shoe-making mechanical and electrical heat pipe, mold heating pipes, electric cigarette tube equipment, pharmaceutical machinery electric pipe, electroplating equipment, heating tube, heater Teflon, titanium heating tube, far infrared heating tube, quartz heating tube, ceramic tube heater, titanium system without Pb furnace, electric lap Limited, and Deputy States imports and compensation of thermocouple wire.

深圳市新宏大电热科技有限公司是一家专业生产大型防爆加热器、高温型模温机电热管、蜂巢式除湿干燥机电热管、中央空调风机盘管加热器、波峰焊回流焊电热管电热丝、、制鞋机电热管、模具加热管、卷烟设备电热管，制药机械电热管、电镀设备加热管、铁弗龙加热器、钛加热管、远红外电热管、石英电热管、陶瓷电热管、钛制无铅锡炉、电热圈的有限公司，并代理各国进口热电偶及补偿导线。

Control type cabinet electromechanical product refers to electromechanical device control cabinet, electrical switchgear, network correspondence cabinet and so on.

控制类柜体机电产品是指各种机电设备控制柜、电器开关柜和网络通信机柜等量大面广的机电产品。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。