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The rules of effect of the experimental parameters of the pulse electrochemical finishing, such as the flow field, the electrolyte flow rate and the interelectrode gap on surface quality are highlighted and analyzed based on the experiments in this paper.

目前 ,脉冲电化学加工主要集中在脉冲电解成形加工方面,加工精度是其重点研究对象[1~ 7] 。日本学者用成对电极的方法对线切割加工后的表面进行光整加工[8] ,取得了较好的表面质量,但这种方法也采用成形加工,通用性较差。

With the efforts of pre-processing interelectrode electrical parameters, discharge voltage and discharge current, the data acquisition system is qualified only if it can gather signal with frequency of 2MHz, the maximum frequency the pulse power source can generate.

通过对待测信号的调理,使采集系统的任务降到只需以微细电火花脉冲电源的脉冲速率进行采样即可,即速率要求为2 MHz。

First, it begins with the study of the centralized CFAR detection with multiple sensors. The non-CFAR problem is analyzed; the necessity for local CFAR processing is established. The effective local CFAR processing scheme is proposed, i.e. the local test statistic. The upper limit of the optimal performance is proved for the distributed CFAR detection based on LTS. Then, the new schemes based on LTS are analyzed in condition of signal pulse, and then the analysis is expanded to the case of multiple pulses. Next, the feedback mechanism is introduced. At last, the invariant test is used to reveal the essence of CFAR processing. It explains the necessity of local CFAR processing in the distributed CFAR detection at a higher level.

本文深入研究了这方面的问题,首先从多传感器集中式 CFAR 检测入手,分析其存在的非 CFAR 问题,论述局部 CFAR 处理的必要性,提出有效的局部 CFAR 处理方法:局部检测统计量,证明基于局部检测统计量的分布式 CFAR 检测的最优性能上限,分析基于局部检测统计量的新方案在单脉冲条件下的性能,并且进一步拓展到多脉冲非相干积累的情况,然后引入反馈机制,最后利用不变检验的概念揭示 CFAR 处理的机理,从更高的层次上解释分布式 CFAR 检测做局部 CFAR 处理的必要性。

With the quotation of three pulse coefficients, the fluctuating turbine is regarded as isobaric turbine.

引入三个脉冲系数将脉冲涡轮按等压涡轮计算。

Compared with rectangle and isosceles trapezoid electric pulses,it is indicated that transmission Characteristics of Nonlinear Electric Pulse is more closer to that of rectangle pulse,when the risetime is shorter and the beeline is more horizontal.

结果表明:上升沿愈陡,直线段愈水平时,非线性电脉冲与矩形脉冲的传输特性愈趋近。

It introduces the process of getting ultra-short pulse using a gain switched quantum well DFB laster as signal pulse source,the method of obtaining OTDM signal and extracting short pulse through the technique of extracting light-pulse which apply to high-speed OTDM system.

介绍了采用掺铒光纤放大器获得超短脉冲;利用方程差微调法获得光时分复用信号和易于实现动态色散补偿的啁啾光纤光栅实现色散补偿,以及通过适于高速光时分复用系统的光时钟提取技术提取时钟脉冲等内容。

The simulation results show that a characteristic saw-toothed velocity is generated in vertical, and a lower limit of laser repetitive pulse for stable ascent is defined; In lateral pass, higher frequency of laser pulse can produce quicker reversion and smoother trajectory, and with the increase of slope of lift curve, the lightcraft can be stabilized in shorter time.

结果表明:在垂直方向,光船上升速度呈锯齿状,且存在脉冲频率下限;在侧向,激光脉冲频率越高,回复速度越快,回复曲线也越光滑,升力线斜率的增加能够使光船以更短的时间趋于稳定。

D. Personick, of calculating the sensitivity of the digital optic receiver, the optimal gain of APD and the decision level, is based upon the waveform of input light pulse at the receiver.

本文提出以易于确定的发送端光脉冲波形及光纤展宽参σ'作为计算出发点,并假定光纤对光脉冲的响应为高斯函数。

The sending end when the use of pulse modulation approach will be a binary digital signal into a frequency modulation of the pulse sequence, and driver fired infrared tube to the form of light pulses sent receiver will receive the pulse of light conversion to electrical signals , and then, after amplification, filtering and other treatment to the demodulation circuit after demodulation, reduced to a binary digital signal after the output.

发送端采用脉时调制方式,将二进制数字信号调制成某一频率的脉冲序列,并驱动红外发射管以光脉冲的形式发送出去;接收端将接收到的光脉转换成电信号,再经过放大、滤波等处理后送给解调电路进行解调,还原为二进制数字信号后输出。

In this paper, the author investigate the oscillation of a class of second-order linear differential equation s with impulses, revealing the relation between this and the non linear differential equation s with impulses in Oscillation.

摘要研究一类二阶线性脉冲微分方程解的振动性,揭示了此类方程与相应的非脉冲方程在振动性方面的联系。

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