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The sum of a series of trigonometric expressions; used in the analysis of periodic functions .

三角表达式级数之和，用在周期函数分析上。

The sum of a series of trigonometric expressions; used in the analysis of periodic functions.

三角表达式级数之和，用在周期函数分析上。粗鄙下流的举动；粗话；下流话

A criterion for the existence of a single impact period-1/n motion is obtained, and the initial position of the superharmonic periodic motion is found.

经过详细的理论演算得到单碰周期1/n的超谐周期运动的存在性判据，并能精确地找到超谐周期运动的初始位置。

The critical bifurcation parameter intervals of superharmonic periodic impact motions are deduced, and numerical simulations are used to verify the results.

本论文讨论了碰撞振动系统的周期碰撞运动，得到了超谐周期碰撞运动的存在性和稳定性，推导出亚谐周期运动的临界分岔参数区间，并利用数值模拟进行验证。

The fact is provided by simulation that, when the excitation frequency is close to the 3-times superharmonic resonance frequency, the system response consisted of principal response and 3-times superharmonic resonance is stable and periodic.

在出现3倍超谐共振的频率附近，系统的响应为主振动响应与3倍超谐振动响应共同组成的稳定的周期振动。

After undergoing a chaotic region, the period number will add one, in the same time, magnitude of the subharmonic response increases in sequence as the rotational speed ratio increases. When the rotational speed is below the critical speed, the chaotic bands resulted directly from a perioddoubling bifurcation occur among the successive orders of superharmonic responses, then they can return directly to periodic motion by a reversed period-doubling bifurcation.

在转速小于临界转速的情况下，在分岔图中各个连续阶亚谐运动的转换区中分别都出现了经由一个倍周期分岔直接导致的混沌频带，后又直接由一个逆倍周期分岔转化为周期一的运动，同时在三个混沌频带之间都出现了幅值突跳的现象。

Due to the regulating by the cubnonlinearities, some parametric ranges in which 3-times superharmonic vibration or 1/3-times subharmonic vibration arises exist in the sytem. When the excitation frequency approaching 3-times or 1/3-times resonance frequency, the system response is stable and periodic .This fact shows that regulating action of the cubic nonlinearities on the vibration system is strong.

由于立方非线性对达芬系统的调节，系统存在出现3次超谐共振和1/3亚谐共振的参数域，在激振频率接近3倍或1/3倍派生系统的固有频率时，立方非线性对系统的调节作用越来越强，从而使动态响应成为稳定的周期性。

The periodic variation in amplitude of a wave produced by the superposition of two waves of different frequencies.

通信技术中的一种调幅信号，其载波的振幅在调制波形周期的某些部分减少到零。

Due to the existence of periodic structure, the energy will be coupled into the surface wave.

由于周期性结构的存在，能量可以从自由空间耦合到表面波中。

Operating profit is the balance of operating revenue after deducting operating cost, periodic expenses and all turnover taxes, surtax and fees.

营业利润为营业收入减去营业成本、期间费用和各种流转税及附加税费后的余额。

No clear conclusions can be made about the predictie alidity of specific measures, they found, except for criteria for the underuse of drugs for cardioascular disease.

除了心血管病不合理用药标准外，对于特定评价方法的预测效度没有明确的结论。

The third and last is that almost all of them, being infinite in number, have been impostures, and by idle and crafty brains merely contrived and feigned after the event past.

第三、即最后一点是：几乎所有这些不胜枚举的预言都是欺人之谈，都是在事件过后由无聊而狡猾的脑筋推测与凭空捏造的。