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This equation of motion will be very useful in identifying simple harmonic motion and its frequency.

该运动微分方程於识别简谐振动及其频率时非常有用。

Simple harmonic motion is the motion executed by a particle of mass m subject to a force that is proportional to the displacement of the particle but opposite in sign.

简谐振动是指质量为m的质点-该质点承受一种与其位移成正比而方向相反的力作用-的运动。

At first the structures of the face harmonic motion drive of separate tooth are analyzed. Its principle of work is given. And simple chart of dynamic mechanism without superfluous constraints is established according to contact and junction of components each other.

首先介绍了散齿端面谐波齿轮传动的结构，分析了其工作原理，根据各构件间的相互接触和联接情况建立了传递动力、无多余约束合理的机构运动简图。

The DIS exploring experiment of simple harmonic oscillation in teaching material is improved.

针对教材中简谐振动的DIS探究实验的不足，对实验进行了改进。

While working, the whole ultrasonic oscillation transmission is in state of resonance, and does harmonic oscillation.

工作过程中的超声振动系统整体处于谐振状态，超声传递系统做简谐振动。

By use of Fourier transforms or sine series ,the harmonic vibrations of the beams on the transversely isotropic saturated poro-semiplane were investigated.

利用Fourier变换或正弦级数，研究了该介质上梁的简谐振动问题，将原先极为复杂的问题转化为数值积分问题。

Compared with the computer simulation results, the experimental instrument can demonstrate the multi-frequency harmonic vibrations synthesis very well.

通过与计算机仿真结果的比较，实验仪能够很好地演示多倍频简谐振动的合成。

The response problem of a harmonically driven beam with respect to the influence of Winkler foundation in temperature field is considered.

研究在温度场中受简谐激励作用的 Winkler地基梁的响应问题。

Based on the definition of Boolean function on set and positive extension, The sufficient and necessary condition of PBF is proven. At last, an algorithm of generating MSP expression of stack filter positive Boolean function is presented taking advantage of Hasse diagram.

通过定义布尔函数开、闭集和最小项正、负扩展，证明了布尔函数具有层叠性的充要条件是布尔函数开集的正扩展或闭集的负扩展具有不变性，在此基础上，提出了一种通过Hasse图确定层叠滤波器最简正布尔函数的算法。

Based on the definition of Boolean function on set and positive extension, The sufficient and necessary condition of PBF is proven. At last,an algorithm of generating MSP expression of stack filter positive Boolean function ispresented taking advantage of Hasse diagram.

通过定义布尔函数开、闭集和最小项正、负扩展，证明了布尔函数具有层叠性的充要条件是布尔函数开集的正扩展或闭集的负扩展具有不变性，在此基础上，提出了一种通过Hasse图确定层叠滤波器最简正布尔函数的算法。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。