查询词典 wave mode

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 new examination method combined lots of examination modes, such as uniform examination mode, interviewing mode, additional score mode by designing an object or writing a paper, and do-it-yourself mode, i.e., self-question, self-answer and self-comment, which is a reasonable link between uniform examination and free exertion, has been put forward by integrating common basic platform with synthetic enhancement.

考试方法改革应该直接促进学生自主学习，从而有利于学生能力培养，反过来又可以进一步促进教学方法的改革，从而充分调动教师和学生两方面的主动性和积极性；考试方法改革应该更加重视学生知识、素质和能力培养的过程，全面地考核学生的知识、素质和能力，从而为学生的发展创造更好的氛围和条件。

In global mode, annular omnidirectional images are captured by using skip subsampling mode to guarantee high frame rate, and then unwrapped to cylindrical panoramic images containing global scene information of 360 degrees. In local mode, the location and size of sampling window of image sensor are reconfigured according to the position of interested region, thereby only a corresponding rectangle region of omnidirectional images is captured by using pixel-by-pixel mode, and then unwrapped to a high- definition local perspective image of the corresponding view angle. Finally, a hardware design based on DSP+FPGA is presented.

在全局模式下，为保证采集帧速率，使用行列跳跃模式采集完整的环状全向图，并将其展开为包含360°全局信息的柱面全景图像；在局部模式下，根据感兴趣区域的空间位置设置采样窗口大小及位置，以逐像素采样模式只采集全向图中相应的一块矩形区域，并将其展开为对应视线方向上高清晰度的局部透视图；最后给出了DSP+FPGA结构的系统硬件设计方案。

Your website if mode is novel, it is a very good news is nodded so, comment on mode comment on a net, individual portal mode, the book sound of fabaceous valve resembles commenting on mode.

你的网站假如模式新奇，那么是一个很好的新闻点，评论模式的点评网，个人门户模式，豆瓣的书籍音像评论模式。

Study modelling thought, network configuration, majorize GNNM(1,1) mode method and learning algorithm of GNNM(1,1) mode combined grey system theory and neural network. Based on tunnel construction settlement monitoring of Nanjing Metro NO1, simulate and forecast monitoring data by GM(1,1) mode and GNNM(1,1) mode.

研究了灰色系统理论与神经网络组合的灰色神经网络GNNM(1，1)模型的建模思想、网络结构及其优化GNNM(1，1)模型的方法和学习算法；结合南京地铁一号线隧道结构沉降监测实例，分别运用灰色系统理论GM(1，1)模型和灰色神经网络GNNM(1，1)模型对监测数据进行了模拟与预报。

3 AC motor 15kw 1/set 1.4 Speed regulator 15kw 1/set 1.5 Detailed requirement:--thermal treatment and quench for gear surface Feeding base 6 Auto feeder --mode vacuum suction model 7 Dry with hopper type --mode auto control temp.hot wind for heating --mode AC motor 2、Composite die head with changeable core and mouth mould ф11~ф32mm one unit moule --mode spiral type,with changeable mouth moule and core moule --heating control zone stainless steel heating ring --power Each set for changeable calibrator、mouth moule and core rod

1.3交流电动机十五千瓦1/set 1.4调速器一十五千瓦1/set 1.5详细的要求：-热处理和淬火齿轮表面喂养基地 6 ）自动接驳-模式真空吸管模型 7 ）干燥，漏斗型-模式的自动化控制t emp.hot风加热-模式交流电动机 2 ，复合模头与复杂多变的核心和口模ф11 ф32毫米一个单位moule -模式，螺旋型，与复杂多变的口m oule和核心m oule -暖气管制区不锈钢暖气响动-电源每套为复杂多变的校准，口moule和核心杆

The organization structure of distance education system can be divided into four typical modes: tree mode, radial mode, netlike mode and mixed mode.

远程教育的组织结构分为四种典型模式：树状模式、辐射状模式、网状模式、混合模式。

By means of adiabatical elimination of the excited level with assumption of the large detuning between the pumping and ion, we have one cavity mode couples to the vibrational mode of the ion with a nondegenerate downversion and the linear mixing happens between the second cavity mode and the vibrational mode.

分析发现，即使在考虑腔场的衰减和声子模加热的情况下，光腔的输出场在中心频率总存在纠缠。接下来我们研究了在非大失谐的条件，离子辐射场的纠缠特性。

The article tries to sum up the legislative mode frame that break down makes in the round, baconian and wraparound break down makes configuration classify mode, establish the conditional mode, specific content that drafts mode of patternmaking type, responsibility and punishment and relationship.

本文试图全面总结中止犯的立法模式框架，归纳概括中止犯形态分类模式、成立条件模式、拟制模式、责任及处罚模式的具体内容和关系。

Based on the laser longitudinal mode splitting theory, a novel scheme of dual-frequency laser with large frequency-difference is presented using electrically controlled birefringence of liquid crystal, and the transmitted resonant mode splitting by birefringent of Fabry-Perot etalon has been analyzed theoretically. A new element of liquid crystal Fabry-Perot etalon is designed and fabricated, which serves as aselector and splitter of both laser longitudinal modes and Fabry-Perot etalons transmitted resonant modes. Two different experimental systems of laser-diode end-pumped Nd:YAG laser have been set up using two different LDs, and the transmission of liquid-crystal cell have been measured. When the empty LCFP is inserted in the cavity of high-power LD pumped Nd:YAG laser, the oscillation of a single laser longitudinal mode have been observed, such a result shows that the designed and fabricated LCFP element is capable of selecting single axial mode. While an anti-reflected liquid crystal cell is inserted in the cavity of Nd:YAG laser end-pumped by the high-power LD, it is difficult to confirm weather the laser longitudinal modes have been spitted or not. The subject is summarized in this thesis and the improvement of the project has been presented.

论文以激光纵模的分裂理论为基础，提出了可望获得几十GHz甚至上百GHz的液晶电控双折射双频Nd：YAG激光器的总体方案，并对用双折射效应分裂F-P标准具透射谐振模进行了理论分析；设计并加工了一种集激光纵模选择、激光纵模分裂和F-P标准具谐振透射模分裂于一体的多功能元件——液晶电控双折射F-P标准具；建立了两种不同功率激光二极管端面泵浦的Nd：YAG激光实验系统，并对液晶盒的透射性质进行了测试；将未灌注液晶的空液晶F-P摘要标准具插入大功率LD泵浦Nd：、叭G激光谐振腔内，观察到了单纵模激光输出，说明所设计和加工的液晶F一P标准具具有纵模选择能力；将镀有增透膜的液晶盒插入大功率LD泵浦Nd八7AG激光谐振腔内，是否产生了激光纵模分裂现象还难以确定。

Researches reveal that students who suffer from corporal punishment tend to resort to violence in their future life.

研究表明遭受过肉体惩罚的孩子倾向于在他们今后的人生中使用暴力。

Total sugar of sarcocarp and chlorophyll of pericarp increased firstly, and then decreased afterward along with altitude; Titratable acidity, ascorbicacid and anthocyanin of pericarp were increased along with altitude; The content of protein increased firstly and decreased afterward along with altitude; Carotenoid of pericarp were decreased along with altitude.

果肉总糖和果皮叶绿素含量随海拔高度升高先升高后降低；可滴定酸、维生素C和果皮花青苷含量均随海拔升高而升高；蛋白质在1720m处最大，1420m处最小；果皮类胡萝卜素随海拔升高而降低。