正弦曲线

研究得出，拉瓦尔喷管滑动弧存在四类电压突变点；电流大体上呈正弦曲线波动。

There are four types of gliding arc of the Laval nozzle voltage mutations are found . Current substantially show regular sinusoidal fluctuations .

结果表明，旋流器内空气柱的形状、弯扭程度因旋流器锥角和进口流量不同而不同，不能单纯用柱状、麻花状、正弦曲线状等来描述。

The results indicated that the shape of air core and its crackle varied with the cone angle and the inlet flows , which can not simply be described as column , twist or sinusoidal shape .

讨论了摆线、圆、正弦曲线、双曲线和悬链线等特殊曲线的规范B基表示问题。

Lastly , the representation of special curves by normalized B-basis is given , such as cycloid , sinusoidal , catenary and exponential curves .

使用基本Hough变换进行椭圆的检测与提取，利用形状在投影时各投影区间中点是否在一条有效的正弦曲线上来检测形状是否具有中心对称性；

The basic Hough transform is applied to the detection and extraction of ellipses .

使用的最后一个命令reset对于绘制正弦曲线不是必要的。

The last command used , reset , is strictly not necessary for plotting the sine curve .

DM各组IBS亦呈周期性变化，但曲线夫去正弦曲线形态，周期变化幅度亦减低（见图2。3），以DM11组减低明显；

IBS also change periodically in DM , but the form of the curve were abnormal .

在提示符中输入plotsin（x）：您应该在弹出窗口中看到熟悉的正弦曲线。

Type in plot sin ( x ) at the prompt : you should see the familiar sine curve in a pop-up window .

基于Hough变换识别单周期正弦曲线图像的算法及实现

The algorithm of Hough transform and its realization to identify the single cycle sinusoidal curve image

作为应用，给出了双曲线、双曲正弦曲线与指数曲线的UAHB样条精确表示。

As an application , hyperbolic curves , hyperbolic sine curves and exponentcurves are explicitly expressed by the3-order and4-order UAH B-splines .

结果：门）心肌IBS变化规律：对照组心肌IBS呈周期性变化，舒张末期最大，收缩末期最小，曲线形态呈正弦曲线样（见图1）；

Results : ( 1 ) IBS change periodically in normal subjects . The value was maximal at end diastole and was minimal at end systole .

曲线区段线索张力变化对吊弦计算的影响频域反射器（DR）用一个扫频正弦曲线来探测哪些频段是共振的还是静默的。

Influence to Calculation of Dropper Caused by Variation of Tension Force of Wires and Ropes in Curve Section Frequency-domain reflectometry ( FDR ): The loop is sounded with a swept sinusoid to identify frequencies that either resonate or are dead .

四种作物ψ（WL）日节奏为正弦曲线状，13：00&15：00小时ψ（WL）最低，黎明前最高。

Ψ _ ( WL ) of four kinds of crops described a sinusoidal curve with time , with minimum around 1300-1500 h and maximum before dawn .

提出了采用线性插值的方法来实现直接数字频率合成器（DDFS）结构中相位到正弦曲线幅度之间的映射（简称相幅映射）。

This paper presents an approach based on linear interpolation to realize the mapping from phase to sinusoid amplitude ( phase-to-amplitude ) in the structure of direct digital frequency synthesizers ( DDFS ) .

并结合Kemp的跑道型截面几何模型，预测出剪切变形下经纬纱的纤维体积分数和织物的纤维体积分数，经过比较发现，正弦曲线几何模型更适合预测经纬纱压扁程度较大的紧密织物。

By making a comparison between the two models , it had been found that geometrical model of sinusoidal curves was more suitable to predict tight fabrics of transverse compressed warp yarns and filling yarns .

文中还在对各种电梯运行曲线进行分析比较的基础上，把正弦曲线作为ADCM的理想速度曲线。

Based on the analysis of the current lift velocity curve , sine curve was used as the ideal velocity curve of the system .

针对一种新型的紧凑式换热器&一次表面换热器（PSR），分析了分别由椭圆、正弦曲线和抛物线构成板片波纹对芯体性能的影响。

With respect to an innovative type of compact heat exchanger , the so called primary surface recuperator ( PSR ), newly emerging in the international arena , analyzed is the effect of plate corrugation formed respectively by elliptic , sinusoid and parabola curves on exchanger core performance .

这是我们正在采用的一种类似正弦曲线一样的工作方式。

There 's kind of a sine wave thing going on .

自由曲线与正弦曲线合成曲线的研究

A Research into Synthesized Curve of Free Curve and Sine Curve

大跨度悬索结构正弦曲线单元几何非线性分析

Nonlinear Analysis of Large Span Cable Structure Using a Tow-Node Curved Element

数学解释说，正弦曲线是这样的。

And the reason is that a sine curve is like so .

正弦波，或正弦曲线，是数学函数的图形。

Sine waves , or sinusoids , are graphs of mathematical functions .

双正弦曲线能够完全满足非对称振动的要求；

Double sine curve to fully meet the requirements of non-symmetric vibration ;

提出一种以正弦曲线为生成齿条的齿廓曲线生成的新型齿轮。

A new type of gears generated with sine-curved rack are put forward .

周期函数解成简单正弦曲线之和的分析。

Analysis of a periodic function into a sum of simple sinusoidal components .

但是它们不能精确地表示某些圆锥曲线如圆弧、椭圆等，也不能精确地表示正弦曲线。

But they can not represent the arcs , cylinders and sine curves .

波形类似正弦曲线的波。

A wave whose waveform resembles a sine curve .

这里我们使用[-pi：pi]得到一个正弦曲线周期

Here we use [ - pi : pi ] to get one sinusoid cycle

四参数正弦曲线拟合的一种收敛算法

Convergence algorithm of four-parameter sine wave curve-fit

假设我们只想看到一个正弦曲线周期。

Let us say we want to see just one cycle of the sine wave .

简单分析前面例子中所示的电压和电流正弦曲线，就会看出

Eg.A brief look at the voltage and current sinusoids in the preceding examples shows that