分析了等跨布置的铁路简支梁桥在共振速度下的动力特性，及车辆运行平稳性和稳定性。
The bridge's dynamic features and train's running com fort under resonant speed of simply supported beams with equal spans are analyzed.
为避免桥梁共振，设计时应满足第一阶竖向自振频率大于车辆最大速度与车辆长度的比值。
To avoid the most dangerous resonance, the first vertical frequency of the bridge should be greater than the ratio of the maximum vehicle speed to the vehicle length in design.
在相干波与磁化等离子体相互作用的系统中，当波的强度超过某个阈值时，速度空间中的一些共振区将互相重迭。
There is a series of resonant regions in the velocity space of a magnetized plasma interacting with a single wave.
我们获得了解析解，然后给出了共振频率、速度分布、振幅比和节点位置公式。
Analytical solutions were obtained, and the formulae for resonance frequency, velocity distribution, amplitude ratio and node location derived.
证明了相对论性共振条件在动量空间和速度空间存在着差异；
It is shown that there exists some difference between the relativistic resonance condition in momentum space arid that in velocity-space.
研究速度变化的轴向运动粘弹性梁在亚谐波共振及组合共振范围内的参数振动。
Parametric vibration of an axially moving, elastic, tensioned beam with pulsating speed was investigated in the vicinity of subharmonic and combination resonance.
提出了一种可以提高核磁共振测井测量速度的新型测量脉冲序列，它基于对原有CPMG测量脉冲序列的改进。
A new pulse sequence for the measurement of NMR logging is proposed in this article, based on the improvement of original CPMG pulse sequence.
与索氏萃取法相比，核磁共振法的样品用量少，测量速度快，操作简便，不损伤样品。
Compared with soxhlet extraction method, the NMR method features smaller sample consumption, rapid measurement, simple operation and non-destructive to samples.
利用共振隧穿二极管的介观压阻特性，设计了新型的加速度计；
Using Meso-piezoresistance effect of RTD as the principle of a novel accelerometer inthe first.
核磁共振测量中孔隙流体中分子以极快速度扩散的运动。
The rapid rate of diffusion of molecules in pore fluids during a nuclear magnetic resonance (NMR) measurement.
数值计算表明，速度反馈可有效地降低耦合系统共振区域的振动能量传递；
The numerical results show that, velocity feedback strategy can re duce the vibration energy transmission at natural frequencies of the coupled sys tem;
实验表明，顺磁离子能加快水相的核磁共振弛豫衰减速度，而对油相信号没有影响。
These experiments illustrate that paramagnetic ions imbibed in rock brine can shorten the relaxation time of the water protons, but can't effect the relaxation time of oil protons.
实验表明，顺磁离子能加快水相的核磁共振弛豫衰减速度，而对油相信号没有影响。
These experiments illustrate that paramagnetic ions imbibed in rock brine can shorten the relaxation time of the water protons, but can't effect the relaxation time of oil protons.
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