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In this paper, model of vehicle with double axes is used to study the vibrations of vehicle-bridge dynamic interaction system. The active control law based on linear optimal control theory is designed, In which the transient power flow and displacement at mid-span of bridge are accounted separately.

本文采用能更加逼近真实车辆的双轴车辆模型,应用线性最优控制理论,采用可有效控制一阶振型的双臂弯矩控制系统,分别以双轴车辆输入桥梁的瞬时功率流和桥梁的跨中位移振动响应为目标函数来设计控制律。

Because of the off-phase motor running to recognize the harm caused by different fault in the implementation phase of the motor protection have had two different views: that the broken phase to the electrical damage caused by overheating point of view to the implementation of the motor overheating protection or inverse-time characteristics of overcurrent protection, thermal relays the resulting program, thermal resistance package with over-current fault protection program delay, and other programs; that the break caused by phase to the motor windings high-voltage breakdown back-EMF's view of Open-phase protection program to take instantaneous action, and some electronic-type protectors available.

由于对断相运行给电机造成的危害认识不同,因此在对电机实行断相保护时产生了两种不同的意见:认为断相给电机造成过热损坏的观点要对电机实行过热保护或过流反时限特性保护,由此产生了热继电器方案、热敏电阻方案、断相过流延时保护方案以及其他一些方案;认为断相给电机绕组造成高压反电势击穿的观点,对断相采取瞬时动作保护方案,于是一些电子式保护器问世。

An algorithm is presented based on instantaneous laser power detecting, which meets the requirements of the high precision and the large scale well. Furthermore, the key steps and experiment results are introduced.

空间傅里叶光谱仪的工作环境要求测角算法能够实现高精度和大范围的倾角检测,基于此设计了基于瞬时激光信号功率检测的动态测角算法,介绍了该算法实现的关键技术环节,给出了实验结果。

This paper gives the analysis about the changeable law and the cause of the produced flow pulsation on common gear wheel pump and shows the unfavourable influence of the flow pulsation on hydraulic pressure system, the concrete measures of reducing the flow pulsation to be given.

对齿轮泵瞬时流量的变化规律以及产生流量脉动的原因进行了分析,指出了流量脉动对液压系统的不利影响,提出了降低流量脉动的具体措施。

In accord with the promotion in the photosynthetic oxygen evolution and ATP content, the transient increase in chlorophyll fluorescence after the termination of actinic light was increased; and meanwhile, the half-time of re-reduction of P700〓 in the presence of DCMU after a pulse light under background far-red light was shortened by approximately 30%, indicating that cyclic electron flow around PS1 was accelerated by the treatment.

与此同时,我们还发现经NaHSO〓处理后,蓝藻细胞的作用光关闭后叶绿素荧光瞬时上升的幅度增加,同时在远红光背景下和DCMU存在时,饱和闪光后蓝藻细胞P700〓再还原的半时间缩短约30%,表明低浓度NaHSO〓溶液处理能够促进蓝藻细胞围绕PSI的循环电子传递。

The instantaneous super pore water pressure produced by the pore water of the inner structure of asphalt pavement, under the action of the high speed wheel load, is an important reason that results in water damage of the pavement.

沥青路面结构内部的孔隙水在高速行车荷载的作用下造成的瞬时超孔隙水压力,是造成路面水损害的重要原因。

Based on analysis of ISAR imaging theory in detail, the projection image plane is firstly built according to arithmetic imaging model. We can get ideal image, with which we are able to discuss the effects of the ISAR target image with spinning axis during integration time.

在详尽分析了ISAR成像机理的基础上,首先提出了以数学建模的方法建立目标模型的瞬时几何投影像,讨论在相干积累时间内目标等效旋转轴矢量对成像的影响。

It greatly enhanced the damping force of shock absorber and it is convenient to replacing the foam metal inside this typed shock absorber and it is possible to replacing foam metal of different structure according to different requirements of damping force.

由于该种减振器的阻尼力在一定范围内可由外部磁场快速无级调节,而且这种变化是瞬时可逆的,因此近年来对它的研究和应用开发得到了相当的重视。

It is significant to investigate the stress-strain relationship of green sand to control the molding quality.

利用侧限压缩试验,研究了松散型砂在侧限应力状态下的力学行为,描述型砂压实状态的物理量,提出了型砂的瞬时压缩模量与压缩状态相关的假设。

There is a classical consistency in his treatment of composition, with foregrounds rich of still-lives framed by deep blue, calm horizons.

他对组合的处理有着经典的一致性,眼前为瞬时静止的生物动态,其后则为深蓝宁静的背景。

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The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应,而且减少跟风的可能性。

The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.

聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力