矩形阵

Transmitting and receiving impulse response of two-dimensional array are obtained by the summing impulse response of a single rectangular element with differentia delay time. The approximation arithmetic of array element impulse response is discussed.

讨论了单阵元声场脉冲响应函数的快速近似算法，通过对不同延时量的矩形单阵元声场脉冲响应函数进行叠加，得到了二维换能器阵列的发射和接收脉冲响应函数，再施加以宽带脉冲激励函数，从而得到二维换能器阵列的声场分布。

Secondly, we discuss the boundary value problem of two dimensional biharmonic equation in a rectangular field and its variational problem,discretize it by using dual tensor product of and the direct product and lining up of matrices, we get some special matrices which are the presupposition in exploring the fast computation, then solve the system of linear equations.

其次本文讨论了矩形域上二维双调和方程边值问题及其相应的变分问题，利用二元张量积小波分析和矩阵的直积、拉直技巧将变分问题离散化，从而使求解偏微分方程问题变为求解线性方程组的问题。一维情况两组基的张量积下得到的系数矩阵分别为块状七对角阵和稀疏矩阵。这些特殊结构为以后快速算法的研究打下一个基础。

Based on the model, computational method about the critical velocity of straight tube arrays is given.

2利用本文模型，给出了直管管阵临界流速的计算方法，详细地讨论了矩形管阵和三角形管的临界流速。

Based on the model, computational method about the critical velocity of straig...

2利用本文模型，给出了直管管阵临界流速的计算方法，详细地讨论了矩形管阵和三角形管的临界流速。

A series of theoretical and experimental studies on the microstrip patch antennas with dielectric superstrates is carried out systematically. Firstly, a comprehensive survey of the microstrip antenna technology and its theories are presented. Then, two analysis techniques, named as the spectral domain Green's function method and the spectral domain integral equation method are developed. The SDGF method is a simplified analysis technique, which takes advantage of the spectral domain immittance approach to find the dyadic Green's function for the stratified media, and obtains the complete closed-form formulas for radiation patterns, directivity, efficiency, gain etc. Some interesting calculated results are presented. The SDIE method is capable of determining resonant frequency, radiation characteristics, input impedance etc, for the covered microstrip patch antennas. Comparing with other full-wave analyses it reduced computation and mathematical labour remarkably. The singularities near the pole location of the surface-wave modes and the difficulty of the integral computation over infinite range of oscillating integrands are dealt with actively and documented well. Results predicted by the SDIE method agree extremely well with our experimental results for resonant frequencies of various superstrates. The superstrate effects on impedance and radiation characteristics also have been investigated experimentally so that the gap due to lack of measured data and computed results for multi-layered superstrate has been filled to some degrees and two useful observations have been achieved for weakening the resonant frequency shift and optimizing the microstrip antenna gain. As a meaningful application, the design and analysis of a 4×4 patch array are introduced.

实用微带天线普遍加介质覆盖层来防护热，物理损伤和环境影响，也可能在飞行或严酷气候条件下自然形成覆盖层本论文对带介质覆盖层的微带贴片天线系统地作了一系列理论和实验研究首先，对微带天线技术和理论作了全面的综述然后，发展了两种分析方法，称为谱域格林函数法和谱域积分方程法SDGF法是一种简化的分析技术，它利用谱域导抗法来求得分层媒质的并矢格林函数，并得出方向图、方向性系数、增益等参数的完整的闭式公式，给出了一些令人感兴趣的计算结果SDIE法能确定介质覆盖微带天线的谐振频率、辐射特性和输入阻抗等与其它全波分析方法相比，它明显减小了计算量和数学工作量已有效地处理了表面波模极点附近的奇异性和对振荡的被积函数的无限区间积分计算的困难对于不同覆盖层情况下的谐振频率，由SDIE法所预示的结果与我们的实验结果吻合得很好对于覆盖层对阻抗和辐射特性的影响也已作了实验研究这在某种程度上填补了缺少实验数据和计算结果之间的间隙，并得出了缓解谐振频率偏移和优化天线增益的两点有用的结论作为有意义的应用，介绍了一个4×4元矩形贴片天线阵的设计和分析。

Programs, AFITA and SHET, are developed, which can be used to compute the critical velocity for straight tube arrays and U-tube arrays of all sorts of tube arrangements in uniform and non—uniform flow and to calculate the response of tube due to flow induced vibration.

6开发了软件AFITA、SHET，能进行三角形、矩形排列的U型管和直管管阵、均匀流和非均匀流的临界流速分析，单根管自由振动和湍流诱发振动分析。

A cross shaped sum-difference network is constituted by microstrip ramose coupler with compact structure and calculated by ADS,while the 8×8 rectangular patchs,which is optimized by HFSS on basis of the method of parameter load and so on,form the transmiting/receiving antenna.

使用ADS优化设计了一种结构紧凑的&十&字形和差网络，并且使用参数加载等方法，在HFSS中仿真出一个8×8的微带矩形贴片天线阵列作为收/发天线，和差网络和微带天线阵列组成单脉冲天线阵。8×8天线阵列、和差网络和馈电系统在同一平面上，所以此天线阵列与传统单脉冲阵列相比体积更小，结构更紧凑，对该天线阵列进行了研制和测试，测试结果符合设计要求。

Round and rectangular piston transducers are the common sound source in ultrasonic nondestructive testing, and combination plane arrays of line and rectangular array are the foundation of investigating phased array technology, so simulating these sound field is significant for studying ultrasonic field simulation.

圆形活塞换能器、矩形活塞换能器是超声无损检测中常用的声源，而线列阵组合平面阵和矩形阵组合平面阵是相控阵换能器研究的基础，因而其声场的模拟在超声场模拟的研究中具有重要意义。

Using the method of Green's function, the coupling between conformal antennas is analyzed. The mutual coupling between the E plane and the H plane are calculated, and the effect of the curvature and space between to the mutual coupling are discussed.

本文利用格林函数法分析了微带天线阵元之间的互耦效应，得到了矩形微带单元阵元之间E面、H面的互耦结果，并讨论了圆柱曲率半径和阵元的间距对阵元之间互耦的影响。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。