中板

This paper mainly consists of three parts:(1) Based on the Reddy's higher-order shear deformation plate theory and general von Kármán-type equations, put forward the governing equations of pre- and post-buckled vibration of several hybrid FGM plate forms which have not been studied adequately, triumphantly applying the perturbation technique combined with Galerkin method into equations solving, and get the comparatively simple result forms with complicated deduction at last;(2) As a new type of materials, piezoelectric fiber reinforced composite actuators were applied to optimal vibration control, interrelated informatons be depicted in this paper;(3) During the investigative cource, some factors not been considered adequently in other researches were discussed fully in the postbuckled vibration analysis, such as the temperature-dependent material coefficients, heat conduction and nonlinear vibration characteristic etc.

本文的研究工作主要包括：(1)基于Reddy高阶剪切变形板理论和广义Kármán型方程，给出了几类现有研究成果较少或没有彻底解决的FGM混合板结构的屈曲前和屈曲后振动特性研究的控制方程，成功将摄动-Galerkin混合法应用于求解过程，并给出了各控制方程相对直观且易于计算的解析解形式；(2)单向压电纤维增强复合材料(Piezoelectric Fiber Reinforced Composite，简称PFRC)是一种新型压电材料，本文将其应用到了结构振动控制研究当中，发现通过压电纤维体积含量的选择可以实现混合板结构的优化振动控制；(3)围绕几种有代表性的FGM混合板结构，讨论其屈曲后的振动特性，在分析中同时考虑热传导，材料物性参数的温度相关性，以及机/热/电荷载耦合效应对非线性振动特性的影响，最后给出了大量数值计算结果。

Therefore, combined with the past experiences of the optimization of satellite structures and based on the characteristics of honeycombed sandwich panel which is used a lot in the satellite structure, we propose an equivalent panel modeling method and it can avoid the inconveniences of design variables of honeycombed sandwich panel.

为此，作者结合卫星结构设计方面的经验，并根据卫星结构中大量应用的蜂窝夹层板的特点，提出了等效蜂窝夹层板和考虑板间连接刚度的一整套方案，为建立简单可靠，使用方便的卫星结构有限元模型提供了有效的方法，从而避免了蜂窝夹层板选取设计变量方面的诸多不便。

The restoring Casimir force, which is the force that changes from repulsion to attraction with the increasing slab separation, may be found to exist between perfectly conducting material and metamaterial slabs. This restoring force is a natural power for the system oscillation in vacuum and also can be used for system stabilization

而若将其中一个材料板取为理想导体板，Casimir效应则可表现为随板间距的增大从排斥力转变为吸引力即平衡回复力，这种力可用来产生板间振荡或稳定真空中的力学系统。

The major works in this thesis are: The effect of the straight and skew cracks on the vibration properties are studied for the cantilever beam, clamped-clamped rectangular plate, simple-supported rectangular plate and triangular plate. The effect on the natural frequency and vibration mode shapes of the bracket in the presence of cracks is discussed Based on the available index of crack diagnosis, a new index, is proposed.

本文主要的工作有以下几个方面：★研究了工程中常见的悬臂板、四边刚性固定矩形板、四边简支矩形板和三角形板的直裂纹和斜裂纹对振动特性的影响。

Regulation by the side of the block-pressed support, so that the supporting block to maintain good contact with the workpiece: by regulating the extension units in the handle, change or reduce the concentration of cutting lathe and extension units in the large gap between the extension units: in order to break them down.

可通过调节上侧支承块的压紧力，使支承块与工件保持良好接触：通过调节中拖板手柄，改变切削浓度或减少车床大拖板和中拖板间的间隙：从而加以消除。

In this paper, in accordance with Biacob plate-bending theory, analytical solutions of bending problems of rectangular plates are presented.

本文根据符拉索夫平板理论，提出了矩形板弯曲问题的解答格式，应用本文中的(8)和(9)式，可求解通常边界条件下，承受横向均布力q_0以及承受横向均布力和板边法向弯矩等组合荷载共同作用下的矩形中厚板的弯曲问题，而且使这类问题的解析解规律化。

BEIJING - Triple Olympic champion Guo Jingjing bagged women's 3m springboard gold at Beijing Olympics on Sunday, becoming the first-ever diver to win back-to-back Olympic individual and synchro titles.

三届奥运会金牌得主郭晶晶在周日进行的女子3米板跳水决赛中再次折桂，成为第一位在个人3米板与双人3米板跳水决赛中获得金牌的女运动员。

Triple Olympic champion Guo Jingjing bagged women's 3m springboard gold at Beijing Olympics on Sunday, becoming the first-ever diver to win back-to-back Olympic individual and synchro titles.

三届***金牌得主郭晶晶在周日进行的**3米板跳水决赛中再次折桂，成为第一位在个人3米板与双人3米板跳水决赛中获得金牌的女运动员。

Triple Olympic champion Guo Jingjing bagged women's 3m springboard gold at Beijing Olympics on Sunday, becoming the first-ever diver to win back-to-back Olympic individual and synchro titles.

参考译文：三届奥运会金牌得主郭晶晶在周日进行的女子3米板跳水决赛中再次折桂，成为第一位在个人3米板与双人3米板跳水决赛中获得金牌的女运动员。

The main research work of this dissertation is as follows: Based on the chemical reaction engineering theory and the nitrobenzene electroreduction mechanism, the plate and frame electrolyzer was designed and applied to the process of electroreduction nitrobenzene to p-aminophenol. This dissertation measured the residence time distribution data of the electrolyzer by means of the pulse response method and studied the rule of flow pattern along with the current capacity change. Under different conditions ,this dissertation studied the cyclic voltammetry properties of nitrobenzene on different electrodes by means of the dynamic cyclic voltammetry method and the electrode materials applied to the NB electroreduction have been selected primarily.Baseed on the results of cyclic voltammetry tests, this dissertation used p-electrode systems to measure the steady-state- polarization curves of nitrobenzene on different electrodes in H-type diaphragm cell, and obtained each primary factor s influence rule and the exchange current density value of each electrode.And then on the basis of the conclusions of fundamental researchs upword, the effects of influence factors on the the yield of p-aminophenol and the current efficiency,such as electrode material, current density, quantity of electricity circulated, nitrobenzene concentration . sulpuric acid concentration and so on, have been studied in detail in the systems of hign temperature , strong acidity and oxygen-poorthrough a series of electrolysis experiments in this paper.After all using Pb as anode Monel metal as cathode Dupont Nafion 417 cation-exchange membrane as membrane, this dissertation obtained the optimum technological condition: reaction temperature about 85C, current density 500A m-2, sulphuric acid concentration 20%wt.

论文的主要研究工作为：运用化学反应工程理论，结合硝基苯的电还原机理，设计出用于硝基苯直接电还原合成对氨基苯酚实验的板框式电解槽，并利用脉冲响应法测定了该板框式电解槽的停留时间分布数据，研究了流型随流量变化的规律；通过动态循环伏安法研究了硝基苯在不同电极上、不同条件下的循环伏安特性，初步评选出了用于硝基苯电还原的电极材料；结合循环伏安的测定结果，在H型隔膜电解槽中采用三电极体系测定了硝基苯在不同电极上、不同条件下的稳态极化曲线，得到了各主要因素的影响规律及硝基苯在各个电极上电还原的交换电流密度数值；在基础研究结论指导下，采用板框式电解槽，在高温、强酸、贫氧系统中，进行了一系列的电解实验，分别考察了电极材料、电流密度、通电量、硝基苯浓度、硫酸浓度等因素对收率及电流效率的影响，最终选择以蒙乃尔合金电极作为阴极、铅合金为阳极、Dupont Nofion 417阳离子交换膜为隔膜，得到由硝基苯直接电还原制对氨基苯酚的最佳电解工艺条件：反应温度85℃，电流密度500A·m~(-2)，硫酸浓度20％wt。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。