脉冲宽度

through the analysis of the infrared emission coding, this paper presents a kind of design scheme of infrared remote controller based on the mcu at89s52.in this paper, the remote controller learns infrared code by pulse width measuring, saves code by index, outputs carrier wave by timer.

通过对红外遥控器发射编码的分析，提出了一种以单片机at89s52为核心的自学习型红外遥控器的设计和实现方案。在方案中采用测量脉冲宽度的方法来学习红外遥控编码，采用索引存储的方法来保存学习到的红外编码，采用单片机定时器来产生红外编码发射所需要的38khz红外载波。

Combining the experimental results and theoretical analysis, the following work has been accomplished.(1) Reasons of the decrease of interelectrode capacitance and the increase of discharge gap caused by the powder suspended in dielectric fluid are explained. And the mechanism that surface quality of workpiece improved by powder-mixed EDM is analyzed from this viewpoint.(2) The variation regularity of the percentage of silicon on the machined surface of workpiece has been summarized according to the experiment results when silicon powder was added into the working fluid. The entropy is introduced to explain the reasons for this variation regularity by thermodynamics.(3) The dimensional accuracy is greatly influenced by the overcut resulting from discharge gap and electrode wear in practice application. Empirical formulas for the overcut in EDM and powder-mixed EDM are established based on the experimental results using the ternary linear regressive method in this paper.(4) The influence of main factors on the machined surface characteristics has been evaluated based on the orthogonal experimental design method.

通过一系列普通电火花加工与混粉电火花加工的对比实验，运用工艺实验和理论分析相结合的方法，重点做了以下工作：(1)探讨了粉末颗粒导致极间电容减小、放电间隙增大的原因，并从这个角度解释了混粉电火花加工可以改善工件表面质量的机理；(2)以混合硅粉的电火花加工为例，实验得出峰值电流和脉冲宽度对加工表面层成分中硅元素含量的影响规律，并引入熵的概念从热力学的角度对硅元素含量变化的原因寻找了理论依据；(3)在实际加工中，由于粉末的加入使放电间隙变大，这使得混粉电火花加工的尺寸精度难以控制，本文利用三元线性回归的方法，在实验数据的基础上，建立了两种电火花加工过切量的计算公式；(4)将正交试验法应用于混粉电火花加工实验研究，并通过对实验指标极差的直观分析，得出各电参数对加工指标影响的敏感程度。

After introducing to the inner structure and the driver timing of a interline area-CCD KAI-1010M briefly,a high speed and low cost CCD driver circuit used in digital space survey camera was designed in a new way.

介绍了行间转移面阵CCD芯片KAI-1010M的内部结构和驱动时序，采用新方法和低成本器件设计了该CCD芯片的驱动电路，把电源和电机控制的脉冲宽度调制技术引入CCD驱动电路，采用超高速运放驱动高速负压信号以减小其上升沿和下降沿时间，达到高速低成本驱动要求，解决了驱动设计中的技术难点。

The OA kneepad with PIC16F630 microcontroller core can control the output signal frequency, pulse width, intensity and work time by controlling keyboardbuttons.

1 以PIC16F630单片机为系统控制核心的OA护膝，可通过键盘按钮控制输出信号的频率、脉冲宽度、强度和工作时间。

The data given in Figure 5 may be used to find the maximum surge current for a square wave of any pulse width between 1 ms and 1000 ms by plotting the applicable points on logarithmic paper.

图5给出的数据可能被用来寻找最大浪涌一脉冲宽度之间的任何一方波电流MS和对数作图文件的适用点1000毫秒。

The function of integrated analog circuits realized with CPLD is discussed. Two methods of controlling the pulse width of monostable trigger are studied.

对用可编程逻辑器件技术实现模拟集成电路的功能进行了探讨，研究了实现单稳态触发器脉冲宽度控制的两种方法：用外接RC的单稳态触发器；用外部信号控制脉宽。

The function of integrated analog circuits realized with CPLD is discussed. Two methods of controlling the pulse width of monostable trigger are studied. One is realizing monostable trigger with external RC , the other is controlling the pulse width with external signal.

对用可编程逻辑器件技术实现模拟集成电路的功能进行了探讨，研究了实现单稳态触发器脉冲宽度控制的两种方法：用外接RC的单稳态触发器；用外部信号控制脉宽。

Pulse width generator 404 delays the output signal VIN of NAND gate 403 to generate an output signal VOUT.

脉冲宽度发生器404延迟NAND门403的输出信号VIN从而生成输出信号VOUT。

After the UP and DN signals transition to a logic low, NAND gate 403 generates a rising edge in VIN, and pulse width generator 404 generates a rising edge in VOUT a delayed period of time later.

在UP和DN信号转换到逻辑低电平后，NAND门403在VIN中生成上升沿，且脉冲宽度发生器404在延迟时间段后在VOUT中生成上升沿。

SURGE CURRENT Surge current is specified as the maximum allowable peak, nonrecurrent squarewave current with a pulse width, PW, of 8.3 ms.

浪涌电流的浪涌电流的最大允许指定为高峰期，非经常性方波脉冲宽度，星期三8.3毫秒，电流。

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。