正弦波

Second order incident boundary condition on fixed incident boundary is derived for numerical simulations, based on the cnoidal or sinusoidal motions of wave maker paddle, which shows that the prediction with second order incident boundary condition is more accurate than the prediction with first order incident boundary condition. 2 The analytical solution for higher-order Boussinesq equations is derived and its applicable range is discussed. 3 A 2-D fully non-linear numerical model using boundary element method is developed to obtain wave forces acting on rectangular obstacle. 4 The three-dimensional fully non-linear waves are studied in a numerical wave tank using finite element method.The studies on the coupled numerical model combined Boussinesq equations with Laplace equation are following.

非耦合非线性波浪计算模型：1 根据造波板做椭圆余弦运动或正弦运动速度，推导出数值模拟波浪水槽时固定入射边界上的二阶波浪入射边界条件，数值计算结果和实验结果的对比表明采用二阶入射边界条件对波面升高的预报比采用一阶入射边界条件对波面升高的预报更为精确；2 推导了波浪水槽造波板做正弦运动所产生波浪的高阶Boussinesq方程摄动展开解析解，讨论了该解析解的适用范围；3 对整个波浪水槽应用边界元方法数值模拟了波浪对物体的非线性作用；4 用有限元法求解三维Laplace方程模拟了三维完全非线性波浪水槽。

According to the Lorentzian doppler spectrum, the weighted coefficients and the frequencies of the sinusoids are derived in four different modes.

推导了由Lorentzian型多普勒谱得到正弦波的频率和加权系数的四种不同方法的计算式。

In [26] it was shown those bases that consist of the spikes and the complex sinusoids yield a most mutually incoherent pair.

在文献[26]中证明了那些由尖峰和复杂正弦波构成的基础产生相互最不相干的对。

Each of the N sinusoids that make up the model has unknown amplitude and a frequency that equals one of the N frequencies in the list of frequencies.

构成该模型的N个正弦波中的每个均具有未知幅度，并具有一频率，该频率与频率列表中的N个频率中的一个相等。

Based on the DM model of the three-phase four-leg inverter, the DM performance of SPWM jump-edge delay strategy is analyzed. Its DM performance becomes worse because of the alteration to the local volt-second equivalent between the pulse and sine wave.

虽然SPWM跳变后移策略会使三相四桥臂逆变器获得最佳的共模输出特性，但因它改变了脉冲局部与正弦波的伏秒等效关系，导致逆变器差模特性变差。

In effect, the tank circuit makes the RF output sine wave--like a bell that is struck at a constant rate by a hammer.

其实，槽路就使之输出正弦波信号--就如同一个铃铛被一只锤子以恒定的速率敲击。

Three typical micro-mechanical models for the elastic constants analysis of stitched composites are compared by calculating,wihch are in-plane fiber bend model,sine waviness model and polynomially described fiber waviness model.

通过计算对比了铺层纤维面内弯折、正弦波状弯曲、多项式描述纤维弯曲三个典型的缝合复合材料弹性常数的细观力学分析模型。

Each Max object is an autonomous software 'device' that carries out a specific task, such as multiplying two numbers, sending a MIDI message, or synthesising a digital sine wave.

每个最高的对象是一个自主的软件'装置'是进行了具体任务，如乘以两个号码，发送的MIDI信息，或人工合成的数字正弦波。

AIM: To study the mechanism and implementation of current pulse exciting impedance measurement of bio tissues.

为减少皮肤电极接触阻抗、极化电势所引起的伪差，实际应用中多采用正弦波恒流源激励［2］。

The inclination of the ecliptic results in the contribution of another sine wave variation with an amplitude of 9.87 minutes and a period of a half year to the equation of time.

黄道倾角的结果导致另一个半年为周期的正弦波变动效应，使均时差在半年的震荡达到9.87分钟。

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。