系统发生

The warm high ridge in mid-and-lower troposphere over North China, the pressure ridge over Okhotsk sea and the western Pacific subtropical high are major circulation system influencing summer climate anomaly in North China.

2华北地区上空对流层中下层发生的暖高压、鄂霍兹克海地区的高压脊和西太平副热带高压是影响华北地区夏季气候变异的主要环流系统。

The model is a 10-level limited-area primitive equation model, with horizonatal resolution of 22.5km.

这样预报对流系统的发生就变成了吸引子的计算，不严格地依赖于初始状态。

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。

A novel distributed printing system, method, program, printer and server are provided that provide optimum distributed printing without problems such as a backlog of print jobs in a print queue.

本发明公开了一种可以实现最佳分布式打印，而不发生诸如在打印队列中积压打印作业的问题的新颖的分布式打印系统、方法、程序、打印机以及服务器。

A: Since the printer can print the form on the printer in the hardware there is no failure, caused by the above phenomenon is most likely a printer driver error or system infected with a virus.

答：既然打印机可以打印表格，说明打印机在硬件方面没有任何故障，引起上面现象的很有可能是打印机驱动程序发生了错误，或者系统中染上了病毒。

Hormonal imbalance happens may occur when you get too much estrogen and progesterone in your system.

荷尔蒙不平衡的情况可能会发生，当你得到太多的雌激素和孕酮在您的系统。

In summary, the grain boundary effect in the CMR granular composites strongly depends on the second phase propertied and material preparation method. MR can be enhanced at higher temperature range by appropriate choice of the second phase.

由此可见，不同的第二相材料和工艺制备方法对锰氧化物颗粒复合系统的颗粒边界效应有显著的影响，通过选择合适的第二相材料可以提高磁电阻增强效应所发生的温区。

It is true that there is systematic change in discounted price, but it is not a proportionate change.

贴现价格确会发生有系统的变更，但不是一种按比例的变更。

Connection can put the whole circuit out of action. This should not happen with a wireless system because it

前的芯片某一条连接出现故障就可能导致整个电路无法运转，而采用无线系统就不会发生这样的问题，因

As a necessary and sufficient evidence of dynamical localization, this method can be used to study the system quantitatively.

作为动态局域发生的充要条件，使用该方法可对系统进行定量的研究。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。