正弦波

The foundation of this system provides a good reference to promote the standardization and intelligence of the overhaul and maintenance of vacuum switches. This paper develops a special HF pulse power supply for internal pressure estimation, which achieves the output of HF-HV sinusoidal pulse wave whose frequency and amplitude can be modified respectively, and meets the design requirements according to the results of Simulink simulation and practical experiments. With the help of AT89S52, this paper designs an I~2C serial bus based signal detection system for peak value signal acquisition of HF pulse currents, which communicates with the upper computer by asynchronous serial communication for uploading the data. In the upper computer, a human computer interface is developed by Matlab software, whose functions are to do some computation and graphic display, such as calibrating the relation curve of vacuum degree and peak value of HF pulse currents, vacuum degree computation, and vacuum lifetime evaluation analysis basing on grey forecasting model as well as making relative suggestions.

本文研制了用于真空度检测的高频脉冲电源，通过Simulink仿真和试验检验其满足设计要求，实现了电压幅值和频率独立可调的正弦波高频高压脉冲输出；利用以AT89S52为核心基于I~2C串行总线的信号检测系统实现高频脉冲电流峰值信号的采集，通过异步串行通信实现单片机与计算机之间的数据通信，将检测数据传至上位机；在上位机利用Matlab开发人机交互界面，实现相关数据处理和图形显示，包括真空度——高频脉冲电流峰值关系曲线标定、真空度数值计算、基于灰色预测模型的真空寿命评估分析和提出相应决策建议。

The analysis of the continuous property of raw silk size Setting the decaying rateλand the quasi-cycle value T in the model of the silk size autocorrelation coefficient, building the time series of a single cocoon reeling silk size with autoregressive model, then by combining k such time series according to different phrase, obtained time series of the raw silk size, and finally count up the silk size deviation of the time series.

利用一理想化的正弦波模型生成一粒缫生丝纤度时间序列，通过调查该模型中波动幅度及波动周期的变化对自相关系数序列衰减率的影响，初步建立起一粒缫生丝纤度自相关系数列衰减率λ与纤度时间序列特征数之间的关系式。从而使我们可以生成具有要求连续性特征的生丝纤度时间序列，为进一步研究生丝纤度连续性特征提供了新的途径。

Realize high-speed binary scale accumulating, producing sinusoidal wave to search the form address.

实现高速二进制累加，产生正弦波查表地址。

Based on the nonlinear dynamical equation of product packaging system,the shock spectra and the damage boundary curve of tangent nonlinear packaging system under the action of half-sinusoid pulse are obtained using a numerical method,and the influence of various factors on shock response is discussed.

采用数值求解单自由度产品包装系统的非线性动力学方程，得到了半正弦波冲击下正切型非线性包装系统的冲击谱曲线和边界破损曲线，讨论了相关参数对它们的影响

For analog systems, the carrier is usually a sine wave of a particular frequency, such as 1800 Hz.

模拟系统中，载波通常是某个频率如1800 Hz的正弦波。

The most important of the most commonly used analog modulation is the sine wave as a carrier perspective modulation and amplitude modulation.

最常用最重要的模拟调制方式是用正弦波作为载波的幅度调制和角度调制。

One method is to change the problems of estimating complex two-dimension sinusoids into the problems of estimating characteristic polynomial coefficients.

一种方法是将复杂的二维正弦波参数估计问题巧妙地转换成一个特征多项式系数估计问题。

Reducing and canceling common-mode voltage methods are presented respectively using SPWM and SVM . Simulation results validate their correctness.

针对常用的变频器控制策略—正弦波脉宽调制SPWM和空间矢量调制SVM，分别提出了降低和消除共模电压的改进策略，并用仿真结果验证了其正确性。

Installation, test and practical measurements of the whole system also have been implemented. Studied the various methods of digital monitoring dielectric loss for transformer bushes: harmonic analysis method. Sine-shape parameters method and integration method, states the principles of the three methods, its computational formula has been inferred and compared. Among them, harmonic analysis method was used to test practically both in lab and on site.

研究了变压器套管介质损耗的数字化监测方法：谐波分析法、正弦波参数法和积分法，论述了三种方法的监测原理，详细推导了各种方法的计算公式，比较了各种方法的优缺点，并采用谐波分析法在实验室和现场进行了测试，其结果表明该方法在介损测试中具有较高的稳定性和准确性。

The core of this method is that it turns the unequal interval TOA sequence into a continuous signal.

为了克服上述缺点，该文提出了一种的新算法——方正弦波插值算法。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。