正弦

Fourier's theorem : any periodic function can be expressed as a sum of sinusoids of appropriate amplitudes and frequencies.

付氏理论：任何周期函数均可以表示为一组正弦函数的和，正弦函数具有合适的大小和频率

And thus,the wavelet analysis has developed due to this demand, This thesis is to detect the point of signal discontinuity by wavelet transform.

小波分析正是由于这种需求而发展起来的通过小波变换来精确地检测信号发生变化的时刻，构造一个信号模型，由一个低频正弦波信号连接一个高频正弦波信号，利用小波工具可以检测出信号发生不连续的间断点的位置。

Secondly, the sinusoidal model, which is the speech production model used in STC, and its simplified model, harmonic sinusoidal model, are depicted in this thesis. Then, the key techniques, including pitch detection, magnitude model presentation, phase model presentation, voice probability analysis, vector quantization and speech synthesis, are discussed.

然后，本文对STC的语音产生模型——正弦模型与谐波正弦模型进行了系统阐述，并对低码率STC的关键技术，包括基音检测、幅度和相位参数的模型表示、浊音度分析、矢量量化以及语音合成等进行了详细研究。

A two-dimensional sine quadric surface model accord with the ridge gray distributing rule was designed, and a fingerprint enhancement algorithm was produced based on the model after analyzing the basic character of the fingerprint image.

在深入分析指纹图像的基本特征及其对正弦曲面相似性的基础上，构造符合指纹局部区域纹线灰度分布规律的正弦曲面滤波器模型，并提出了基于该模型的指纹增强算法。

In order to understand and calculate the reactive power of the nonsinusoidal electric circuit accurately and analyses the the influence of the reactive power in the nonsinusoidal electric circuit on reactive energy measurement .

为了能够准确地理解和计算非正弦电路的无功功率，分析非正弦无功对无功电能计量的影响。

In order to ensure that self-compensating devices for reactive power work stably and reliably in low-voltage electric power system, this paper introduces a new method and steps of selecting compensating devices by comparing their types, based on the theory of reactive power in non-sinusoidal alternating circuit.

产生谐波的根本原因是电力系统中器件、设备的非线性，即使供给这些器件、设备的电源是理想的正弦波形电压，电网供给它们的电流也是非正弦波形，即产生了谐波电流，当谐波电流流过线路后，产生谐波压降，使电网电压失真。

With the id￠=0 vector control and the feedforward compensation of cogging, the minimum force ripple and maximum efficiency control of non-sinusoidal BEMF SPM motors can be obtained.

考虑永磁磁链谐波对永磁磁链导数矢量幅值及相位的影响，通过引入d￠q￠轴坐标系，提出一种id￠=0的非正弦波BEMF SPM电机矢量控制新方法，结合齿槽前馈补偿可以实现非正弦BEMF SPM电机的最小推力纹波最大效率控制。

The software tells of the drive of the AD chip and the LCD scree,the realization of the sine interpolation,the display of LED,the scan of keyboard,and so on.

软件上讲述了AD与LCD显示的驱动，正弦内插算法的实现，LED显示与键盘的扫描等功能，在正弦内插算法中使用了DSP Builder软件。

Mainly consists of two aspects, one is made from an inverted pendulum control of the initial perspective through direct adaptive fuzzy control methods to restore stability at Liandugu; the other is an inverted pendulum control from the initial point begun tracking a sine curve, Even inverted pendulum angle according to the requirements of the sinusoidal changes.

主要分两个方面，一方面是使倒立摆从一个可控制的初始角度开始通过直接自适应模糊控制的方法使其重新稳定在零度角；另一方面是使倒立摆从一个可控制的初始角度开始使其跟踪一个正弦曲线，即使倒立摆的角度按所要求的正弦变化。

It is found that the carrier phase and the parameter of sine function affect the pulse energy and the center of time gravity seriously when the pulse width is shorter than one optical oscillation period.

结果表明载波相位和正弦函数的参数对超短正弦高斯脉冲的脉冲能量和时间重心有很大的影响。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。