脉冲宽度

The ANSYS/LS-DYNA software was used to simulate the stress wave pattern and the pulse width in the process, as the hammers had different masses and the radius of impact head and its elastic modulus had different impact velocities, and the prestressed bolt was excited by hammers with different masses and different hardnesses in laboratory.

然后运用ANSYS/LS-DYNA软件模拟了不同质量、撞击头半径和弹性模量的撞击杆以不同的速度撞击长杆的应力波形态和脉冲宽度，并在实验室对预应力锚杆用不同质量、不同硬度的力锤进行了激振试验。

It means that the wider of the pulse, the unclearer of the fingerprint image.

这意味着，脉冲宽度越宽，指纹图像清晰度越差。

The pulse widths and spacings are arranged so that their weighted average produces a sine wave.

如此设置的脉冲宽度和间距使它的加权平均值恰好是正弦波。

3D effect is analyzed and the average velocity of wave propagating in the pile, which mainly influences inverse interpretation, is discussed. Finally, the theory results are verified by model experiment. It is shown that 3D results have the same phase with ID results. The pile radius, the duration of impulse, the ratio of hammer radius to pile radius and shear velocity of the soil around the pile have influences on 3D effect. The best position of receiver is 0.55R from the pile center. The average velocity of wave propagating in the pile reduces due to transversal inertia effect and 3D effect.

结果表明：三维曲线与一维结果在相位特征上一致；波场图直观地反映了波在桩中的传播规律；三维效应与桩径、激振脉冲宽度、相对激振半径及桩周土剪切波速有关；传感器放在0.55R处可以得到干扰较小的信号；三维效应和横向惯性效应的存在会使桩中的波速减小，土的性质对波速影响不大；反演精度与缺陷的性质、激振条件有关。

Based on the theoretical results, quasi-continuous wave with pulse width of 80 ps was lunched into a 70m long nonlinear PCF and SC with the spectral range from 1300 nm to 1700 nm was generated, covering the whole communication window.

在理论研究基础上，将脉冲宽度为80 ps的准连续光耦合入70 m长的非线性光子晶体光纤，获得了覆盖整个通信波段的超连续谱，波长范围1300～1700 nm。

The class-D amplifier works by varying the duty cycle of a pulse-width-modulated signal.

D类放大器通过变化脉冲宽度调谐信号的信号周期而工作。

By a piece of type-II critical phase matching biaxial crystal LBO for extra-cavity and for the compound system of telescope and Lens second-harmonic generation,green laser at 532 nm was achieved with average power of 40.6 mW,pulse duration of 16 ns, and peak power of 181 W.

先采用双凸透镜组合成的望远镜系统对1 063 nm的红外激光进行扩束，再对该光束聚焦，最后经双轴晶体LBO倍频后，得到了平均功率为40.6 mW，脉冲宽度为16 ns，重复频率为14 kHz，峰值功率高达181 W的绿光激光输出，1063 nm→532 nm的转换效率高达58%。

It is also analyzed that the influences of target shape, radial length and pulsewidth on the simulation results.

数据分析表明激光一维距离像曲线能够较好反映目标的纵向几何外形信息，并着重讨论了入射激光脉冲宽度与目标径向尺寸对距离像的影响。

It is presumed whether the electron temperature can rise up quickly in the early discharge and fall down rapidly during the discharge afterglow is the key to realize the alternate oscillation of self-terminating and recombination lasers in univalent ions of strontium in experiment.

分析了两种激光交替振荡的发射过程、脉冲宽度特性和粒子数反转机理，认为在放电早期和余辉期电子温度的急剧升高和降低是Sr离子自终止和复合激光实现交替振荡的关键所在。

The designed controller can operate at fixed frequency without an internal oscillator,which has better output voltage ripple.

AOT控制保证了转换器在无需内部振荡器的条件下，工作于固定频率脉冲宽度调制模式，并改善了输出电压的纹波特性。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。