脉冲

This paper analyzes the phase jitter of the overflow signal, and the spectrum expression of the pulse output is obtained. The computer simulation results are also given.

作者根据脉冲溢出型DDS的工作原理对其输出脉冲信号的抖动进行了理论分析，得到了输出脉冲信号的频谱表达式，并给出了计算机仿真结果。

The half paraboloidal IRA is easy to match UWB pulse generator. The principle and radiation field of IRA is discussed with field on the spherical surface aperture.

抛物面冲击脉冲辐射天线是一种新概念的超宽带电磁脉冲辐射天线，它包括抛物面反射器、TEM馈臂和匹配电路等，半抛物面冲击脉冲辐射天线解决了与源的匹配和连接问题。

A pulsed-tone timing device includes pulsed audible guide tones activated at an initial pulsing rate when on-off pause key is pressed.

本发明的脉冲音定时装置在按压通断暂停键时产生以初始脉冲率触发的脉冲可闻主导音。

A new way of distance measurement is introduced in this paper, it is similar to traditional measurement way, and has its origination. In the new measurement way, the rough measurement of the distance is realized by countering high frequency pulses filled in discriminable phase pulses. Discriminable phase pulses go through integral circuits, and then are sampled by Analogue Digital Converter, so the accurate measurement of the system is obtained by the sampling value.

本文提出了一种新的测距方法，该方法与常规相位测距仪比较，既有相似之处也有其创新之处，常规相位测距仪一般使用多波长测尺频率组合、差频数字测相的方法，本系统虽然也采用多波长测尺频率组合，但并不采用差频数字测相，该方法摒弃了传统的内外光路的切换方式及电路的混频，粗测采用对鉴相脉冲填充高频脉冲的办法实现，精测则利用鉴相脉冲对积分电路进行积分，然后由ADC 对积分电平进行转换，通过对ADC 的输出值的计算处理实现精测。

The main principle of this technique is to control sensitization time of photographic plate by light impulse instead of shutter.

高速频闪摄影技术的主要特点在于：用光脉冲代替相机快门，以控制底片的感光；在光脉冲时间非常短(本文最小光脉冲宽度可达8μs，其技术指标代表目前国内的最高水平)的情况下，达到对高速运动的流体"冻结"而拍照、观察的目的。

It includes high power high voltage constant-current-charging system, capacitors bank, discharge control system, power supply of preignition for Xe-flashlamps, general control and diagnostic system. The power conditioning system drives flashlamps that pump the SSHCL. Flashlamps are driven by high voltage Silicon Controlled Rectifiers switched, resonant charged, discharge pulse forming network. The system uses microchip and digital circle which is based on CAN-bus for control and diagnostics. Energy diagnosis and thermal management are controlled by computers.

其中大功率高压恒流充电装置采用了L-C串联谐振电路，充电功率大，效率较高；储能装置采用了多节脉冲成形网络，可产生波形良好的强电流放电脉冲；放电控制装置采用高压大功率晶闸管，开关速度快，工作稳定；预燃与触发装置采用了开关电源电路，效率高、功耗小；总控与测量装置采用基于CAN总线的数字电路和单片机技术，控制冷却系统在激光器出光时对脉冲氙灯进行水冷，并对全系统进行控制和状态检测，同时具有过压、过流、过热等保护功能。

By means of the comparison principle and the method of upper and lower solution,the corresponding sufficient conditions under which the models have a solution or no solution are obtained. If other parameters are given,the controllable parameters such as the population of release and the times of impulsive harvest are estimated respectively.

基于比较定理和上下解方法，分别获得了模型有解或无解的充分条件，估计了相关可控参数，即脉冲投放模型中的投放量以及脉冲收获模型中的脉冲收获次数。

In order to provide increased pulse width without compromising range resolution, a technique is used that provides for the transmission of a long pulse that can be compressed into a short pulse length in the receiver.

为了提供更多的脉冲宽度不损害分辨能力范围，使用提供长脉冲传输的技术，它可以在接收器中被压缩成短脉冲长度。

The pulsed Nd:YAG laser cladding is one of the most effective methods of the precise repairing technology. It is decided by the voltage, electric current, pulse length, pulse frequency, scanning speed and beam diameter of the Nd:YAG laser.

脉冲Nd：YAG激光熔覆技术是精密修复塑料模具最有效的方法之一，激光器的电压、电流、脉冲宽度、脉冲频率与激光的扫描速度、光斑直径等工艺参数直接影响着熔覆的质量。

The word '' pulse '' in the term '' Pulse-Code Modulation '' is somewhat confusing, as there appear to be no "pulses" per se anywhere to be found except in the transmission line.

脉冲」一词用在「脉冲编码调变」中似乎显得令人困惑，因为除了在电线中的电力以外，并没有任何明显可见的「脉冲」。

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。