查询词典 Pulse

The pulse width broadening of the femtosecond laser after angular dispersion wasdescribed,the pulse width expression at arbitrary propagation distance was provided,the pulse width broadening of the femtosecond laser by AOD was precisely predicted,thegeneral theory on pulse width broadening of plane wave,spherical wave and Gaussianbeam was deduced and the physical mechanism of pulse width broadening based on eachabove light beam model was revealed.

本文对随机扫描双光子显微镜中飞秒激光传输特性进行了系统深入的研究，完整解决了这一理论问题，发现了空间与时间色散通过角色散耦合的规律，为空间与时间色散同时补偿的方案提供了理论依据，基于此原理的单个角色散器件同时补偿空间和时间色散的方案高效解决了声光偏转器的色散补偿这一核心难题，为建立随机扫描双光子显微成像装置并应用于神经学研究奠定了基础：阐明了飞秒激光经角色散后的光斑展宽规律，获得任意传输距离处的光斑解析式，精确预测了声光偏转器对飞秒激光的光斑展宽，并揭示了光斑展宽的物理机制。

The foundation of this system provides a good reference to promote the standardization and intelligence of the overhaul and maintenance of vacuum switches. This paper develops a special HF pulse power supply for internal pressure estimation, which achieves the output of HF-HV sinusoidal pulse wave whose frequency and amplitude can be modified respectively, and meets the design requirements according to the results of Simulink simulation and practical experiments. With the help of AT89S52, this paper designs an I~2C serial bus based signal detection system for peak value signal acquisition of HF pulse currents, which communicates with the upper computer by asynchronous serial communication for uploading the data. In the upper computer, a human computer interface is developed by Matlab software, whose functions are to do some computation and graphic display, such as calibrating the relation curve of vacuum degree and peak value of HF pulse currents, vacuum degree computation, and vacuum lifetime evaluation analysis basing on grey forecasting model as well as making relative suggestions.

本文研制了用于真空度检测的高频脉冲电源，通过Simulink仿真和试验检验其满足设计要求，实现了电压幅值和频率独立可调的正弦波高频高压脉冲输出；利用以AT89S52为核心基于I~2C串行总线的信号检测系统实现高频脉冲电流峰值信号的采集，通过异步串行通信实现单片机与计算机之间的数据通信，将检测数据传至上位机；在上位机利用Matlab开发人机交互界面，实现相关数据处理和图形显示，包括真空度——高频脉冲电流峰值关系曲线标定、真空度数值计算、基于灰色预测模型的真空寿命评估分析和提出相应决策建议。

When the chirped pulse with area smaller than propagates in the medium, splitting doesn't occur and the chirped pulse evolves gradually to an approximate normal Gaussian pulse (C=0), and this characteristic doesn't vary when the chirp coefficient; however, variation of the chirp coefficient will change amplitude and group velocity of the pulse.

面积小于的啁啾脉冲，在介质中传播时不发生分裂，且啁啾脉冲逐渐演化为一个近似的无啁啾(C=0)脉冲，这一特点不随啁啾系数的改变而改变；但啁啾系数的变化将改变脉冲的振幅和群速度。

The pulse propagation through fog medium is discussed .The pulse distortion induced by fog is found using method of closed solution for Fourier integral in time domain. It is found that the pulse distortion is affected by the visibility, frequency, pulse width and path length.

在此基础上应用傅立叶时域积分近似解方法对脉冲波通过雾媒质时的传输特性进行了研究和分析，给出了脉冲畸变、频移随频率、能见度及传播距离的变化关系。

Program is divided into three parts: phase.m symbol of the baseband shaping pulse sequences, optional rectangular pulse, the square root raised cosine pulse and raised cosine pulse model.m-based procedures, completed a variety of base-band signal constellation mapping , pulse shaping and modulation command.m given spectrum shows a simple test.

程序分成三个部分：phase.m对基带码元序列进行脉冲成型，可选矩形脉冲，升余弦脉冲和平方根升余弦脉冲； model.m 为主程序，完成各种信号的基带星座图映射、脉冲成型和调制； command.m给出一个简单的频谱显示测试。

After two experienced doctors of Traditional Chinese Medicine who knew nothing affirmed the pulse is wiry pulse, we used sphygmograph to note the sphygmogram of carotid. Then after the rabbits breathed calmly, two experienced doctors of Traditional Chinese Medicine who knew nothing affirmed the pulse was the normal pulse ,we noted the the sphygmogram of carotid under the same pulse-taking pressure. After classifying the parameters in the sphygmogram of carotid, we analyzed them by time domain.

2.2 给予家兔疼痛性刺激建立弦脉模型在非麻醉状态下将家兔行颈部手术，暴露颈动脉，经两名有经验的中医师双盲取脉，使用脉图仪记录颈动脉脉图，待家兔呼吸平稳后再由两名有经验的中医师双盲取脉，确认为平脉后在同样的取脉压力下记录颈动脉脉图，对脉图参数进行分类后做时域分析。

The effects of pulse parameters such as pulse width Ton, pulse interval Toff, pulse frequency f, pulse current density J on the morphology ,grain size , hardness, internal stress and orientation of coating , and coherence of coating to sucbstrate have been examined .

研究了脉冲电镀参数：脉冲宽度Ton ，脉冲间隔Toff，脉冲频率f，脉冲电流密度 J对镀层微观形貌、颗粒大小、硬度、与基体结合力的影响，分析了镀层内应力、择优取向与脉冲参数的关系。

Secondly, the pulse discharge plasma with allylamine was discussed, and the modification results with two kinds of discharge models were compared. The results showed that discharge models had influences on the plasma treatment results, especially under lower pressure and higher temperature with pulse discharge. The nitrogen element content in the layer under the pulse discharge was obviously lower than that under the continuous discharge, but there was higher proportion NH〓 groups remaining in the layer under the pulse discharge. The sample surfaces obtained by pulse discharge also had good biocompatibility.

其次讨论了脉冲放电模式下丙烯胺单体的等离子体修饰，比较了两种放电模式对修饰结果的影响，研究结果显示，放电模式对表面修饰层的结果有一定的影响，其中脉冲放电对低压及高温两等离子体条件下的影响尤为明显；脉冲放电下所得到的修饰层中的氮元素含量明显低于连续放电模式下，而脉冲放电下有较高比例NH〓基团保留在修饰层中；脉冲放电所得到的表面修饰层同样有较好的生物相容性。

Pulse of been extracted in different scales of energy feature is classified by fuzzy cluster analysis and come into being standard pulse model bank, which is used to help unsorted pulse find the closest pulse in standard pulse model bank by fuzzy diagnosis.

故采用模糊聚类分析的方法对已提取不同尺度能量特征的几种脉象进行分类并形成标准脉象模型库，供下一步模糊模式识别对未分类的脉象在标准脉象模型库中找出最接近者。

2Theory of pulse combustion was analyzed and its mechanism were discussed with planewave transferring theory in the thesis.Models of pulse combustor were reviewed and analyzed.Theone-dimensional unsteady nonlinear model of pulse combustor was simplified with lineal method.The phase relation between pulse pressure and combustion heat discharge which may prompt ordamp pulse combustion process were discussed.

对脉动燃烧理论进行了分析探讨，从平面波的传递理论出发，分析了脉动燃烧的机理；在归纳综合现有的脉动燃烧器理论模型的基础上，采用线性化分析方法，对一维非线性脉动燃烧器理论模型进行了简化，并定性分析了脉动压力与燃烧放热之间的相位关系对脉动燃烧过程的激励和阻尼作用。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。