谐波

The truncation error in calculating the harmonic loss is analysed and a method is offered to determine how many times harmonics must...

文中还对谐波损耗计算的截断误差进行了理论分析，确定了谐波损耗所需计算的最少谐波次数。

Several aspects were also discussed , including control method of harmo nic wae , measurement mehtod , calculation and analysis process of hamonic wave .

论述了抑制谐波的措施，测量谐波的方法及系统谐波的计算和分析过程。

Based on the single-particle theory, we inspect the effects of harmonic wiggler field components on the outputs of free electron lasers (including the components of fundamental and harmonic frequecies), and derive the complete simulation equations for millimeter wave FELs. Meanwhile under the condition that the harmonic wiggler fields are much smaller than the fundamental one, we describe the effects simulated. Using the improved 3D WAGFEL code.

在单粒子理论的基础上，详细考察了摇摆场谐波分量对自由电子激光输出功率的影响，给出了完整的模拟方程组，并在摇摆场谐波振幅远小于其基波振幅值的假定下，利用三维WAGFEL程序和毫米波自由电子激光放大器的参数模拟计算了摇摆场谐波对自由电子激光基频输出功率的影响。

The reason is that the population of the ground state descends and the population of the first-excited state increases in the two-color coherent lase relative that in the monochromic laser and the transition channel of the electron to the even-parity continuum

氦离子在添加倍频光的双色场作用下高次谐波产生效率极大提高的原因是：倍频光极大地加快了电子电离到连续态及返回基态这一过程，使辐射出的高次谐波光子数大大增加，该初步阐释可为高次谐波真正应用到实际中提供一些理论启示。

In chapter 5, the new concept of net-calculatoin, and site testing of harmonic resistance is papered out, by means of the testing of a harmonic source.

在第五章，通过对一谐波源的具体测试工作，提出了电网谐波阻抗网络计算法及电网谐波阻抗实测法的新观点。

For electric power pulsive shipping, the voltage is not always normal, especially when the main motor is starting, and three-phase bridge commutated circuit is used widely, so, a new method to compute harmonic is developed, which is more accurate and practical, is more adapt to the ship condictions.

因此，本文在上述文献的基础上，对接入电压波形畸变的电网中的三相桥式整流电路进行了分析，采用了一种实用的新方法来计算三相桥式整流器所产生的谐波电流。本方法考虑了交流侧电抗及电网中存在的谐波电压，导出了交直流两侧谐波电流的计算公式。

The thesis includes the following contents:Firstly, some basic conception of the harmonics is introduced resumptively, main methods and history 、 present situation and development of harmonics measurement and harmonics analysis are summarized.

本文所做的工作如下：首先，概括地介绍了电力系统谐波的一些基本概念，总结了电力系统谐波测量与分析的主要方法以及谐波测量与分析的历史、现状和发展。

To reduce the errors caused by using FFT for an unsynchronized sample sequence analysis and to improve the measuring precision of interharmonics in electric power system, an interharmonics estimation based on interpolation FFT algorithm is proposed.

为了减小非同步采样的影响，提高间谐波分析精度，提出了基于加窗插值FFr算法的间谐波参数估计，分析和推导了基于Rife-Vincent窗的间谐波频率、幅值和相位的估计公式。

To reduce the influence of an unsynchronized sample sequence on FFT and improve the precision of harmonic in a power system, the harmonic estimation based on interpolation FFT algorithm is proposed. The estimation based on five coefficients of Rife-Vincent window is discussed in detail and the formulas for estimating harmonic patameters are deduced.

由于快速傅里叶变换在非同步采样时存在较大的误差，无法直接用于电力系统谐波分析，本文提出了一种基于五项窗Rife-Vincent插值FFT算法的谐波参数估计的新方法，并推导了其谐波参数估计公式。

The methods to solve the harmonic superposing problem and their shortcomings are discussed. An electromagnetic transient simulation model is proposed to analyze multi-harmonic superposition and simulation experiment is made in this article.

文章系统地比较了当前多谐波源叠加方法的缺陷和局限性，并给出了运用数字仿真技术来进行多谐波源网络的谐波分析方法，进行了仿真实验。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。