动的

The power system forced oscillation introduced by anharmonic periodic disturbances is then discussed. The effect of complicated pressure pulsation, ballistic pressure pulsation and quasiperiodic pressure pulsation on the stability of power system based on a single machine infinite bus power system and multi-machine power system are analyzed respectively through simulation.

从理论上探讨非简谐周期性扰动下的电力系统强迫振荡，并通过时域仿真分析单机无穷大系统和多机系统中汽轮机复杂压力脉动、准周期压力脉动及冲击性压力脉动对电力系统稳定性的影响。

An asymptotic series solution is constructed by the perturbation technique of deflection type for buckling and postbuckling behaviors of the cylindrical shells under external pressure.

考虑到边界效应对中短圆柱壳的影响及边值问题摄动解的一致性，详细研究了该圆柱壳端部边界层方程和奇异摄动解，以便与中部正则摄动解相匹配。

The first batch of three bullet trains rolled off the production line on April 11 at Tangshan Railway Vehicle Co., and is scheduled to start operating in ...

据介绍，时速300公里"和谐号"动车组是在引进消化吸收国外时速200公里动车组技术平台的基础上，是目前世界上运营速度最高的动车组列车之一。

The friction performances of carbon face were investigated with an inertia friction tester. The torque curve of carbon face was ideal, the coefficient of static friction was lower than that of dynamic in 0.28 MPa, the friction coefficient of static and dynamic decreased with the braking pressure increasing. To the fiber face, the coefficient of dynamic friction of carbon face was more stable in cycle braking process, the wear rate was lower, and it was efficient to protect the couple plate not to be worn.

结果表明：碳质层的摩擦力矩在制动初期上升较快，中间过渡区平稳，尾部翘起较小；在制动压力小于0.28 MPa时静摩擦系数小于动摩擦系数，且动、静摩擦系数均随制动压力增加而减小；相对纤维层而言，采用碳质层摩擦时摩擦力矩曲线形态更好，连续制动时摩擦系数波动较小，磨损率低且能够有效保护偶件，是1种静/动摩擦系数比较低且适用于高载荷工况条件下使用的摩擦材料。

The friction performances of carbon face were investigated with an inertia friction tester.The torque curve of carbon face was ideal,the coefficient of static friction was lower than that of dynamic in 0.28 MPa,the friction coefficient of static and dynamic decreased with the braking pressure increasing.To the fiber face,the coefficient of dynamic fric...

结果表明：碳质层的摩擦力矩在制动初期上升较快，中间过渡区平稳，尾部翘起较小；在制动压力小于0.28 MPa时静摩擦系数小于动摩擦系数，且动、静摩擦系数均随制动压力增加而减小；相对纤维层而言，采用碳质层摩擦时摩擦力矩曲线形态更好，连续制动时摩擦系数波动较小，磨损率低且能够有效保护偶件，是1种静/动摩擦系数比较低且适用于高载荷工况条件下使用的摩擦材料。

The two selection restrictions are determined by the cognitive function of middle construction. Though middles do not report actual event, they depict the properties of virtual events, therefore, naturally verbs in middles should be event verbs. And middles are cognitively motivated to deemphasize the role of agent in the occurrence of the event and focus the active role a passive participant could play in the occurrence of the event, then a volitional adjective or adverb that is under the control of agent would bring the deemphasized participant back into focus again, which is obviously contradictory to the cognitive motivation of middles.

这两种选择限制是由中动结构的认知功能决定的，中动结构虽然并不报道具体事件，但它描述虚拟事件的特性，因此动词必须是事件动词；同时中动结构之意图是弱化施事的作用而强化被动参与者在事件中的积极作用，因而一个语义上由施事自主控制的形容词或副词必然又会突显施事的作用，这与中动结构的认知动因是相矛盾的。

According to the requirements of precession, the motion equation of the spatial mechanism is developed.

在此基础上，根据进动要求建立了这一空间机构的进动运动方程，通过仿真研究了气囊进动过程中运动参数的变化规律。

According to the linear stability condition of fixed point, a method of chaotic control is presented.

根据不动点的线性稳定条件，提出了一种混沌控制方法，通过对系统不动点邻域内的状态变量进行扰动，将系统引导至不动点。

P47 Firstly, the fact that labour is external to the worker — i.e., does not belong to his essential being; that he, 16 therefore, does not confirm himself in his work, but denies himself, feels miserable and not happy, does not develop free mental and physical energy, but mortifies his flesh and ruins his mind. Hence, the worker feels himself only when he is not working; when he is working, he does not feel himself.

劳负的满动制劳种，动而力因动，，足的或动自首先，对劳动者说来，劳动是外在的东西也就是不属于他的本质的东西；因此，劳动者在自己中并不肯定自己，而是否定自己，并不感到幸是感到不幸，并不自己地发挥自己的肉体力量和量，而是使自己的肉体受到损伤，精神遭到催此劳动者只是在劳动之外才感到自由自在，而之内则感到爽然若失。

Based on the background given above, this dissertation studies the theories and technologies related with dynamic balancing , makes full use of DSP chips wonderful computational performance, finally researches and designs a portable dynamic balancing system, simplifying the field dynamic balance of rotating machines. Besides, a new method named Order Tracking Based On Phase is presented, which realizes order tracking purely by software. This method simplifies the hardware set for dynamic balancing and has the definitude physical meaning.

基于这样的背景，本文在对动平衡原理及技术方法深入研究的基础上，利用DSP芯片的高计算性能研制便携式嵌入式动平衡系统，使得旋转机械的现场动平衡工作更为简化方便；同时对与动平衡信号处理密切相关的阶比跟踪方法进行了深入研究，在此基础上提出了基于相位的阶比跟踪方法。

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％。