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For the dynamic system of discrete coupled and nonlinear three phase voltage source PWM rectifier, the cycle switch average operator is introduced to transform the discrete system into continuous andthe small signal perturbation method is used to transform the nonlinear system into linear, the small signal dynamic mathematical models are set up.

中文摘要：针对三相电压型PWM整流器这个离散的、耦合的、非线性的动态系统，引入开关周期平均算子将离散的系统变换为连续的系统，应用小信号扰动法将非线性的系统化解为线性的系统，进而分析系统的小信号动态数学模型。

The basic theories of the solid rocket motor, the method of grid generation, discrete equations and coupled two-phase flow flied are introduced in detail.

论文以某小型实验发动机为研究对象，介绍了固体火箭发动机的基本理论、网格生成方法、方程的离散方法和两相耦合算法等内容。

By taking the advantages of SPH and standard finite element methods,a coupled method is proposed,in which the computational model is made up of finite elements in initial time and the large distortional elements are converted automatically into smoothed particles.

扼要讨论了光滑粒子法的离散思想，充分利用光滑粒子法和有限元方法各自的优点，提出了一种初始时刻用有限元建模，计算过程中大变形单元自动转换为光滑粒子的耦合算法。

This athleticism coupled with the theatricality of a doppelganger or triplet existing on the same stage is designed to subtly evoke feelings of competition, fear and omnipotence- all in relation to performance anxiety.

在这些图纸我描绘的生活我的身体虽然大小的规模，在这些图纸的艺术空间是相当肤浅，与数字存在足够的空间和互动。

According to user needs coupled with double-track automatically install the system, to its installation, maintenance bring great convenience, this may not enter the sewage pit.

可根据用户需要配备双导轨自动耦合安装系统，它给安装、维修带来极大方便，人可不必为此而进入污水坑。

We develop and apply the Hirota bilinear-θfunction method,Jacobi elliptic function expansion method,linear superposition method and F-expansion method respectively to solve many 2+1 dimensional nonlinear wave models including 2+1 dimensional 2DsG equation,the coupled ZK equation,2+1 dimensional KdV equation,2+1 dimensional long wave short wave resonance interaction equation and 2+1 dimensional dispersive long wave equation,abundant Jacobi elliptic function doubly periodic solutions are derived.These solutions show various periodic wave shapes and special periodic characters.

发展和应用Hirota双线性-θ函数方法，雅克比椭圆函数展开法，线性叠加法，F-函数展开法等分别求解2+1维2DsG方程，耦合ZK方程，2+1维KdV方程，2+1维长波短波共振相互作用方程，2+1维色散长波方程，获得丰富的雅克比椭圆函数双周期波解，描述了一些周期波形态及周期特性。

Coupled with the four remaining players on the winner's side of the drawsheet, event number 5 in Kelowna assured us of crowning a brand new tour winner for season three.

再加上4个，其余的球员获胜的一方的drawsheet ，事件的数目在5基洛纳向我们保证加冕一个全新的旅游得主赛季3。

Because of technical strength and a strong financial background, coupled with all the employees work hard, factory since its establishment has developed full-automatic hot fuel, hot coal-fired fully automatic, semi-automatic coal heating machines, greenhouse, plant with big fan , livestock fans, high-density drencher, roof fan, CAD optimization, such as circulation fans more than 60 kinds of products, and to establish from the product development, research, project design, selection of matching family of installation and commissioning, service one-stop system.

由于技术力量和资金雄厚，加上全体职工的奋发努力，本厂自成立后已研制开发出全自动燃油热风机、全自动燃煤热风机、半自动燃煤加温机、温室、厂房用大风机、畜牧风机、高密度水帘、屋顶风机、CAD优化环流风机等60多种产品，并建立了从产品开发、研制、工程项目设计、选型配套系列安装调试、服务一条龙体系。

The system is comprised of a 12 low frequency driver and a large-format, high frequency compression driver, coupled to a constant-directivity 90° x 40° horn.

该系统是由一个12低频驱动器和一个大型的格式，高频压缩驱动器，加上一个恒定指向90 °× 40 °角。

A 14XT compression driver with a 1.4 inch titanium diaphragm is coupled to an extremely smooth constant directivity horn with Sound Guard II high frequency driver protection.

14XT压缩驾驶员用一个 1.4 寸钛横隔膜与健全的守卫一起加倍到一个极端地平滑的持续择向性喇叭 2 高的频率驾驶员保护。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。