脉冲波

The method of ultrasonic broaching waveguide entocoele mentioned in th e article is the impulse machining method, in the broaching process the broachin g tool is thrown over the vertical ultrasonic vibration to obviously improve wor king accuracy and surface quality of waveguide entocoele.

本文提出的波导内腔超声推挤方法是一种脉冲加工方法，其实质是在推挤工作过程中，给推刀施加纵向超声频振动，以大幅度提高波导内腔加工精度和加工表面质量。

Wavelet packet based multicarrier modulation is a technique combining wavelet analysis theory and multicarrier modulation perfectly. It provides high frequency efficiency, better performance against intersymbol interference, intercarrier interference, tone and impulse interference and can transmit multirate symbols easily.

小波包多载波调制技术是一种新兴的多载波调制技术，是小波分析理论和多载波通信的完美结合，具有频谱利用率高和良好的抗符号间串扰、信道间干扰、脉冲干扰和单频干扰的优良特性，并且易于多速率传输。

The conventional SHPB technique is improved by using a pulse shaper. Pulse shapers technique is used to modify the incident wave and decrease the effect of wave dispersion to ensure stress equilibrium and homogeneous deformation in specimen, and furthermore a constant strain rate is attained during the loading history. The lasting time of acceleration pulse is enhanced to numerable MSEL, which is more close to actual loading.

本文改进了传统的霍普金森压杆技术，采用波形整形技术，改变加载波形，获得了比较光滑的入射波，降低了波的弥散效应，保证实验时火工品试样中的应力平衡和均匀变形，得到了更接近常应变率的动态加载条件，使加速度脉冲持续时间t提高数倍，更加真实的反映了火工品实际加载环境。

The square wave or corrected sine wave auto inverters have many limitations. When supplying to inductive load (such as electric fan, electric drill etc.), a square wave or corrected sine wave auto inverter produces too much harmonic current which makes the load seriously heated and even damaged. When supplying to capacitive load or rectificative load such as notebook PC, mobile phone charger etc.

方波或修正正弦波电源有很多局限性：在为感性负载供电时产生大量谐波电流，导致电器严重发热，甚至损坏；为容性或整流性负载（笔记本电脑、手机充电器等）供电时产生严重的脉冲电流，严重时可能导致电器损坏。

In this set of experiments, the cells were subjected to sinusoidally pulsing electromagnetic fields for three different frequencies (2HZ、15HZ、50HZ) and one intensity (5～ 8GS). It showed that they enhanced osteoblasts proliferative activity, especially in the group of 2HZ.

通过观察频率分别为2HZ、15HZ、50HZ的正弦波脉冲电磁场对成骨细胞的作用，结果显示三种频率的正弦波电磁场均能促进成骨细胞的增殖，其中以频率为2HZ者作用最明显。

According to Andy Mazzara, the director of the Institute for Non-Lethal Defence Technologies at Pennsylvania State University, prototypes of such devices use a laser to create an ionise d channel of air through which an electromagnetic pulse is directed.

据宾夕法尼亚州立大学的非致命防御技术学院的主任 Andy Mazzara 说，这些设备的样本模型利用激光创造空气离子波道，电磁脉冲通过波道定向。

This thesis introduce the properties of sea clutters, sea clutters elimination, development direction and anti-interference.

简要介绍了海杂波特性，海杂波的抑制技术和发展方向，以及脉冲多普勒雷达抗干扰技术。

Thirdly, we study the clutters of the Pulsed Doppler radar and the clutters elimination algorithms.

再次，本文研究了脉冲多普勒雷达杂波以及杂波抑制算法。

Then the model is used to analyze the filter characteristics in the frequency wavenumber domain and the spatial-temporal domain.

分析了300km高度3维传输函数在频率波数域的特性，并以近地面单位脉冲点源为激发源，得到了内重力波在3维空间中的时空分布。

Every sub-circuit is designed reasonably according to the principle and character of PWM switching converter, such as: bandgap, error amplifier, oscillator, narrow pulse generator, saw tooth generator, PWM comparator, PWM modulator, output stage, OCP circuit and low voltage comparator.

根据PWM开关电源的原理和特点，合理地设计了各个子电路，其中包括：带隙基准源、误差放大器、振荡器、窄波发生器、锯齿波发生器、PWM比较器、PWM脉冲调整器、输出级电路、过流保护电路和低压比较器等。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。