查询词典 force constant

The study indicated that current and displacement stiffness are constant in the range of allowable engineering error. There is a linear range to the magnetic force. The simplified linear model meets the requirement of controller design. The more precise control precision is, the smaller linear range is.

研究表明，在工程误差允许范围内，位移刚度和电流刚度可视为定值，即此时电磁力方程在应用上存在较大的线性区间，因此简化的线性化模型完全可满足控制器设计的需要，且线性区间随着控制精度提高而减小。

A back electromotive force observer is constructed to acquire the information of speed as well as acceleration. By selecting the time constant or observer gain properly, the current command reduction characteristics can be adjusted freely in some range.

其中的反电动势观测器能方便地获得速度和加速度信息，通过适当调整观测器的时间常数和增益，就能使驱动电流指令值在一定范围内自由调解以达到控制目的。

Assumes that molecules are rigid ball, intermolecular End X are all elastic collision, in addition to the instant of collision, the molecular force can be ignored, then the chemical pure gas, K = 4nd2πkT = 4d2pπ, where: k for XmSkTSm Boltzmann constant, m is molecular weight, d the molecular diameter, n the molecular number density, p the gas pressure, T is thermodynamic temperature.

假定分子是刚性球，分子间完X全是弹性碰撞，除了碰撞瞬间外，分子力可以忽略，那么在化学纯的气体中，K＝4nd2πkT＝4d2pπ，式中：k为XmSkTSm玻耳兹曼常量，m为分子质量，d为分子直径，n为分子数密度，p为气体压强，T为热力学温度。

An extra force is produced using the piecewise-constant MS model during the segmenting. In each time step, the additional force is added to reinitialize the level set function, advance the speed of the curve evolution. Otherwise, a nonlinear function Ψ is introduced to instead of u+ and u-for edge preserving in MS model.

该方法在分割过程中利用分段常数MS模型产生一种驱动力，在每个时间间隔加入这种驱动力来推动水平集函数的进化，提高曲线演化速度；另外，通过在MS模型中引入一个非线性函数Ψ代替u+和u-实现保边。

But because the laws, that are at once, and in a short time made, have a constant and lasting force, and need a perpetual execution, or an attendance thereunto; therefore it is necessary there should be a power always in being, which should see to the execution of the laws that are made, and remain in force.

但是，因为立即并短期内可以制定出来的法律具有恒定和持续的强制力，需要持续的执行或照料；所以，有必要设置一种常在的权力，负责察看已制定的并仍具强制力的法律的执行。

The atomic force microscope invented by Binning et al in 1986 possesses very high spatial resolution. It measures the atomic force through a micro-cantilever of very little spring constant .

原子力显微镜是1986年由诺贝尔奖金获得者Binnig等人发明的一种分辨率极高的表面分析仪器，它通过检测一根弹性常数极小的微悬臂梁在样品表面。。。

The speed-sensorless vector control and the identification of motor parameters in this paper are the two novel research of vector control.Using asynchronous machine's mathematic model in three-phase static reference frame, this paper has derived it's mathematic model in two-phase static reference frameand in two-phase rotating reference frame, and got the coordinate transformance formulus based on the constant magnetic force and power force, by compared different field orientation methods, we can find that field orientation at rotor field can realize the decoupling of the stator current flux component

无速度传感器矢量控制和电机参数辨识是矢量控制的两个新的研究方向，本文利用异步电机在三相静止坐标系下的数学模型推导出两相静止坐标系、两相同步旋转坐标系下的数学模型，根据磁动势守恒和功率守恒的原则，得出各坐标变换公式；通过不同磁场定向方式的比较发现，异步电机按转子磁场定向时定子电流励磁分量和转矩分量可以比较方便地实现解耦。

As the temperature of rat aorta was raised, the vasoconstrictive force and vasoconstrictive speed increased, and the effects of norepinephrine on vasculature were raised. The results suggest that the constant X1 for vasoconstrictive force is a factor sensitive to temperature.

认为NE引起的血管收缩张力的大小，显然也处于温度的影响之下；随着温度的升高，血管收缩张力变大，收缩速率变快，NE对血管的作用效力增强；且张力因子X1是温度敏感因子。

This paper describs the requirements of testing members to be nominal, the precedure of exerting load upon the tension rod, specific cautions and the effect upon the construction, for the application of the shear type constant force tester to measure initial tensile force of the rod in the wharf construction for the Port of Tangshan .

阐述在唐山港码头施工中应用剪式恒力仪测定拉杆初拉力时对标定试件材料的要求、拉杆施力的过程和须注意的具体问题以及施工效果。

The results of conversion show that the serious disc must be rejected because its reliable L-HCCF life is greatly less than an overhaul period. Finally, the load distribution of centrifugal and vibration force on labe is derived. Using two method, load on the crack labe gradually reducing and keeping constant with the crack propagation, a crack propagation analysis of fir-tree slot is carried out, and the calculating L-HCCF crack propagation life of slot on the unload method, which is nearly 3 times longer than that on constant method, is 20 times shorter than the pure low cycle life, and agree well with the experimental's.

最后，分析了离心力载荷和振动载荷在榫齿上的分布，进行了榫槽榫齿的有限元计算；提出了枞树型榫槽的卸载概念，并按带裂纹榫齿上的承载随裂纹增长而逐步减少和始终保持不变两种处理方法，进行了复合疲劳裂纹扩展及其寿命计算，由计算得出卸载下复合疲劳裂纹扩展寿命较单纯低周疲劳寿命下降二十多倍；按卸载处理的疲劳裂纹扩展寿命是按恒载处理的三倍多，前者与试验吻合，而后者则偏差较大。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了