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In this paper, we introduced very much and compared elasticity damper and viscous clamper more according to the wildly use in structure control at present. The result is that viscous damper be recommended.

对目前减振控制中应用较为广泛的粘弹性阻尼器和粘滞型阻尼器进行了重点介绍和对比,在自编程序中设置了粘滞型阻尼器单元的力学模型,可以模拟不同阻尼系数的粘滞型阻尼器,并导出了不可压缩流体的计算公式及给出了适用于结构流固耦合分析过程的近似算法。

Damage of permeability deformation has been studied contentiously since Dongpinghu reservoir dam had been built.

东平湖水库围坝自建成以来,对渗流破坏坝基土的研究即持续不断,但由于工程设计的目的和研究单位出发点的不同,侧重点各异。

We find that the naturally defined spin current obeys the covariant continuity equation.

我们发现,普遍定义的自旋流满足协变形式的连续性方程。

The results show that the frequency characteristic corresponds with vortex structures; the detail and approximate characteristics of signal are reflected by wavelet coefficient at different scales; the coefficient map of continuous wavelet transformation reveals the self-similarity of the signal.

采用傅里叶变换和小波变换技术,实现了混合层密度脉动信号的频谱与多分辨率分析,结果表明:信号的频域特性与流场的涡结构相对应,不同层面的离散小波系数反映了不同尺度下信号与图像的细节和平滑近似特征,连续小波变换系数图定性的反映了信号的自相似特征。

Based on the principle of cross correlation, a improved method for the velocity measurement of two-phase flow .

本文在互相关测速原理的基础上,提出了一种改进的方法,即运用差动自相关测量原理,对两相流流速进行测量。

Limit cycle flutter of a two-dimensional airfoil in cubic nonlinear aeroelastic system in incompressible flow is investigated.

引 言 在不可压缩流中的二元机翼是一个典型的自激振动的例子,在该系统中引入非线性项一般会产生如Hopf分岔,极限环颤振[1],周期倍化及混沌等现象。

The theory basic of this paper is the induction of extracting exciting current and theinduction of self-adaptive gain module.

本文的理论基础是:相似电感提取励磁电流的推导,及变增益自适应模型的推导。

A kind of novel bridge type fault current limiter based on self-turn-off devices for three-phase power systems is proposed.

提出一种基于自关断开关器件的新型桥式短路故障限流器。

And the structure and appearance of MnO2 were characterized using various techniques such as chemical analysis, scanning electron microscopy and X-ray diffraction, and the electrochemical performance of MnO2 was discussed using kinds of measurements such as cyclic voltammetry, constant charging/discharging and local action testing method.

采用化学分析、扫描电镜、X射线衍射等实验手段分析二氧化锰的组织结构和形貌,采用循环伏安、恒流充放电及自放电等测试方法分析二氧化锰的电化学性能。

Using first order plug-flow reactor model, BOD5 removal rate constants of the whole wetland system were estimated to be 0.50 1/day (at 24℃) and 0.76 1/day (at 24℃) in the start-up and stable phase, respectively. These values were comparable to or even higher than the value of deoxygenation rate constant, 0.23 1/day (at 20℃), that is normally used in the river water-quality model.

由一阶柱塞流反应器模式(first order plug-flow reactor model)估算人工湿地系统启动阶段及稳定操作阶段的BOD5去除速率常数平均分别为0.50 1/day(24℃)及0.76 1/day(24℃),相当於或甚至高於一般河川水质自净模式中的BOD5脱氧速率常数的0.232 1/day(20℃)。

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She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了,但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场,你等着挨绳子吧!

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本文综合考虑了几种电弧重燃和熄灭理论。