查询词典 a series of frustrations

A relatively direct method is expounded in this paper to prove the termwise differentiation of power series, and a simple method is expressed to calculate the Fourier coefficient.

文摘：用比较直接的方法证明幂级数的和函数在收敛域内可以逐项微分的公式；并得到了计算傅立叶系数的一种简便方法。

With the method, tendency of measured value was analyzed, harmonic mode was checked by using autocorrelation function, the relation between spectrum parameters was analyzed and Fourier coefficient was calculated based on the theory of Fourier series. Finally, the significance of every period was tested and dominant period determined so as to establish the prediction model.

首先对实测序列进行趋势项分析；其次用自相关函数进行谐波模式检验；然后根据函数的傅立叶级数展开理论，分析谱参数之间的函数关系，计算傅氏系数；最后采用F分布检验法对周期进行显著性检验，确定主要周期，从而建立预报模型。

By use of time-varying Fourier coefficient series of power system variables, new dynamic phasor models of thyristor-controlled reactor are developed. In this model the higher order harmonic components that have less impacts on dynamic characteristic of TCR are neglected, and through the average operation of time-domain model of TCR, a dynamic phasor state-space model of TCR is derived.

利用电力系统变量的时变傅里叶系数得到晶闸管控制电抗器(thyristor controlled reactor，TCR)的动态相量模型，该模型忽略了对TCR动态特性影响较小的谐波分量，并通过对TCR时域模型的平均运算获得动态相量状态空间模型。

They adopted the Fourier series expansion for normal form N, which is a new technique.

他们采用了对法形进行Fourier展开的技巧，这是一个新技巧。

Study of propagation properties of apertured super-Gaussian beam by using the Fourier series expansion .

用傅里叶级数展开法研究受光阑限制的超高斯光束的传输特性。

This program has been organized into WORD document I, the programming language MATLAB, the filter designed in this paper Fourier series expansion method.

详细说明：本程序已被本人整理到WORD文档中，编程语言为MATLAB，本文设计的滤波器采用傅里叶级数展开法。

Using the theory of radiation modes and the piezoelectric equation, a Fourier series expansion method is presented to design the PVDF sensors.

该文在声辐射模态理论及一维分布式压电传感器方程基础上，以Fourier级数展开的方法，给出了梁结构PVDF传感器形状与边界条件无关的设计方法。

Fourier series expansion is used to analyze the power spectrum of different injection pulses,such as sine,triangle and rectangle wave.

采用傅里叶级数展开方法，对矩形、正弦和三角等多种注入脉冲信号的功率谱进行分析，研究不同注入脉冲对半导体器件和电路的影响。

Using Fourier series expansion and Laplace transform,a global dynamic equilibrium equation in the spatial state-space form is obtained.

文中利用Fourier级数展开，Laplace变换，推导了变厚度圆锥壳状态空间形式的运动微分方程。

Improve the accuracy of the initial rotor position estimator by using the Fourier series expansion.

在永磁同步的马达启动方面，则透过送出不同向量空间角度的定子电压向量脉冲所量测到的d轴定子电流的大小来估测转子的初始位置，并利用d轴定子电流在空间向量角度以2π为周期的特性，应用傅立叶级数分析做曲线拟合的方式提高转子位置估测解析度，以提高转矩/电流比节省不必要的功率浪费。

Wenxing consistently adheres to the principle of "trict Management,All Member Participation,Quality First,Users Foremost" and follows the business philosophy of excellent quality,highly active and pursue excellence,thus outdoing its counterparts in terms of technology,production scale and administration.

文兴一贯秉承&严格管理、全员参与、质量第一、用户至上&的企业方针，遵循优质、高效和追求卓越的经营理念，从而实现在技术上、规模上、管理上处于同行领先地位。

The left atrium of the guinea pigs was innervated by the two afferent system.

豚鼠左心房受心脏的两个传入系统的双重支配。