纵的分析

In this paper, we research the imaging problems beneath volcanic area. We sort common asymptotic conversion point gathers and perform velocity analysis to establish the initial velocity which will be used in PSTM. By scanning migration velocity and V p/ V s, we get the optimum migration velocity and

本文针对火山岩地震屏蔽层的转换波成像问题，通过对转换波共近似转换点道集进行速度分析，建立了转换波叠前时间偏移的初始速度场，通过速度扫描和纵、横波速度比值扫描确定最佳的偏移速度场和纵、横波速度比值，实现了在火山岩高速层覆盖区域的转换波偏移成像。

The FEM result showed that the impact of damping force from vibration absorber resulted in the fracture of side rail.

分析结果表明：减震器支架在车辆行驶过程中对纵梁的冲击导致了纵梁的开裂。

It shows that the FE method of tireanalysis under driving state and the method dealing with large slip frictionalcontact problems are correct and reliable. The properties of tires under steady cornering state are studied with FEmethod and experiment. Based on the presented contact solution algorithm, a FEmethod is carried out to analyze the properties of tire under steady corneringstate via imposing slip-rolling-constraints on tire bead nodes which contact therim, and the modules are programmed. The mechanical properties anddeformation of tire under pure steady cornering state and steadycornering-driving state are analyzed, and the results show good agreement withthe experimental data.

对匀速侧滑条件下轮胎侧偏特性进行了试验研究和有限元分析研究，基于本文提出的大滑动摩擦接触问题求解方法，通过在胎圈和轮辋接触节点上施加侧偏滚动约束，得到了匀速侧滑条件下轮胎侧偏特性有限元分析方法，编制了有限元分析模块；利用本文给出的有限元分析方法，分析了轮胎在匀速纯侧滑和侧滑-纵滑联合工况下受力变形特性，分析了侧偏角和载荷对轮胎侧偏特性的影响。

By measuring the velocities of the P-wave and S-wave in three orthotropic directions including parallel and vertical directions to the stratum of the rock samples for slate, phyllite, mylonite and metasandstone, and based on the wave velocities of other rocks from the relevant studies, the anisotropic effect of wave velocity ratio of the P-wave and S-wave for most rocks is put forward.

通过对板岩、千枚岩、糜棱岩和变质砂岩等4种各向异性岩石在平行和垂直层理或板理的3个正交方向上进行大量的纵、横波波速试验，并结合对相关文献中己有岩石波速数据的深入分析，提出岩石介质纵、横波波速比的各向异性效应。这种效应广泛存在，其发育程度受到岩石类别的控制。

Pitch of the ship sometimes reaches a large pitch motion,which has a big influence on the navigability of the ship,the accuracy of the weapons and the life of the crew on the naval vessels.

针对现有减小船舶纵摇的方法和装置进行总结和分析，并在此基础之上详细介绍一种新型十字型的被动式抗纵摇舵。

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。

In the test research of the most radical plane column-beam joint specimens are done, so the feasibility and the problem for this construction method could be discussed.

基于此，本文有针对性的对轴压比、剪压比及梁柱混凝土强度级差进行控制，设计并完成了7个按梁混凝土强度浇筑的钢筋混凝土平面框架节点的低周反复加载试验，通过量测各试件节点区水平箍筋以及贯穿节点的梁、柱纵筋在不同受力阶段的应变等，综合分析了各个试件的延性、耗能性及梁柱纵筋的粘结退化状况，考察了节点核心区采用梁混凝土浇筑后对试件综合抗震性能的影响。

A common mistake and its harm in CT secondary connection of transformer differential protection were analyzed,the correct connection mode was explaned,and how to use the hexagon vector diagram of checking was introduced.

分析了一种常见的变压器纵差保护电流互感器错误接线及其危害，说明了正确接线方式，并介绍了如何通过作六角图来检查纵差保护二次接线的正误。

It is shown that by using ECT,both the sensitivity and reliability of the relay protection are improved,and the operation property of conventional two-stage percentage restraint differential protection is meliorated.

以线路光纤纵差保护为例，利用实验数据分析了采用ECT后纵差保护的性能，指出采用ECT后保护在区外故障可靠性、区内故障灵敏度方面有显著提高，继而改进了传统的二段式比率制动差动保护动作特性。

The resolution is improved through optimal combination of bin attributes which are small offset, small bin, wide azimuth, large off-inline distance and high coverage. Then the "feature net" of near surface conditions was created, and the "sudden transition" of near surface variations was found to provide reliable foundation for optimum shooting parameters selection. The effective methods of spectrum analysis were generalized. It is concluded that the target is satisfying sand body interpretation, not pursuing high frequency.

通过较小炮检距、较小面元、较宽方位角、较大非纵距和较高的纵、横向覆盖次数等面元属性的优化组合，提高了该区地震资料的分辨率；建立了表层条件&特征网&，通过寻找表层变化&突变带&，可为最佳激发因素的选取提供可靠依据；总结了频谱分析的有效方法，提出要以砂体解释的需要为目标，避免陷入盲目追求高频率的误区。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。