查询词典 pulse

The pulse overflow DDS, in which the overflow signal of the phase accumulator is used for the pulse output, can be easily implemented by using FPGA. But its pulse output has the drawback of the phase jitter.

脉冲溢出型DDS利用相位累加器的溢出信号作为输出信号，很容易用FPGA器件实现，但它输出的脉冲信号存在相位抖动的缺点。

The study inchcates that the best error pulse width and the competition pulse width are proportional to the sampling period to us and the modulation degree of SPWM; the number of competition pulse are dependent on the slop of us.

均与模数转换的采样周期和调制深度成正比，与载波比成反比；竞争脉冲的个数由us的斜率决定。

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。

Resonant laser ablation is a two-step process, occurring within a pulse of a tunable laser, in which the leading edge of the laser pulse ablates the surface of the solid sample to produce neutral atoms or molecules that are then resonantly ionized by the trailing edge of the same pulse.

共振激光烧蚀技术是指发生在同一激光脉冲时间内的两步过程，它是指用波长可调谐的染料激光取代固定波长输出的激光，并调谐激光输出波长实现所研究原子或分子电子态之间的共振跃迁，激光单次脉冲的前沿对样品进行烧蚀，烧蚀的物质在激光光束内形成粒子气团，同一次激光脉冲的后沿实现对气相原子或分子的共振电离。

Under the assumption of a sech〓 input pulse, TOD is significant only for pulse widths less than 10 femtoseconds resulting in pulse broadening as well as distinct amplitude oscillations on the leading edge. TOD is positively correlated with its length. The calculations presented here allow for the determination of the maximum thickness of crystal that may be used in the autocorrelation system.

结果表明当脉宽接近或小于10fs时，脉冲才有明显的展宽效应，脉冲的展宽倍数与晶体的长度成递增关系，计算同时给出能基本消除三阶色散的展宽效应的倍频晶体的最大厚度，为进一步实验研究提供了依据。

Secondly, we provide a two-level model to depict the one-, two-and three-photon fluorescent process and with it to calculate the one-, two-and three-photon fluorescence intensity dependence of the incident excitation intensity and time. We study the fluorescence intensity when excitation light's time distribution are square pulse、Gaussian pulse and sech pulse. We find that the influence of excitation light's time distribution on the two- and three- photon fluorescence peak intensity is larger than the one-photon fluorescence peak intensity. Two-level model can account for the behavior of saturation fluorescence.

然后用二能级模型解释了单、双、三光子激发原理，在理论上推导出了单、双、三光子吸收诱导荧光强度与脉冲强度以及脉冲作用时间的关系，并进一步研究了入射光时间分布分别为矩形、高斯型、双曲正割型时激发溶解在氯仿溶液中的C22H22N4O样品所产生的荧光峰值光强，结果表明激发光的时间分布对双、三光子荧光峰值强度的影响比对单光子的影响要大。

Result］ The syndrome of phlegm heat blocking lung is featured with fever,heavy cough,much sputum,red tongue,yellow greasy moss,slippery and quick pulse/purple and stagnant finger mark;the syndrome of wind heat with fever,heavy cough,snuffle and runny nose,red tongue,thin and yellow moss,shallow and quick pulse/ purple and shallow finger mark;qi deficiency of lung and spleen with impotent cough,much sputum,pale face,light tongue,white and greasy moss,thin pulse/light red or stagnant finger mark.

结果］痰热闭肺证以发热，咳声重浊，痰多，舌红，苔黄腻、厚，脉滑数、指纹紫滞为特点；风热证以发热，咳声重浊，鼻塞流涕，舌红，苔薄黄，脉浮数/指纹浮紫为特点；肺脾气虚证以咳声无力，痰多，面白无华，舌淡，苔白腻，脉细、指纹淡红或淡滞为特点。

Finally, we should emphasize that besides combing the explorations and researches on the time and frequency domain of traditional pulse wave signals, the central of subproject focuses on the realization of pulse wave signals to design a sphygmography with objective measurement by combining the results of the other two subprojects and clinical diagnoses and pulse condition analysis, in order to equip the sphygmography with automatic diagnostic functions and friendly user interface.

最后，要强调的是本计画的技术核心，兼并传统脉波信号时/频域探讨研究外，并著重在脉波信号定位与实现，以结合另外二个子计画，设计出一具有客观测量的脉诊仪系统，再配合临床疾病诊断与脉象分析，使脉诊仪具备自动诊断功能与人性化之人机界面。

In this dissertation, the scale-up experiments of the decomposition of toluene by pulse corona discharge in wire-plate reactor were investigated systematically, at the same time, The experiments of the decomposition of refinery odors by this technology were also studied. A pulse power based on thyratron switch, Blumlein pulse forming network and pulsed transformer was adopted.

基于上述小试成果，本文主要对有机废气中的代表性污染物模拟甲苯废气，在线板式反应器内进行了系统的放大试验研究，同时将该技术应用于实用目标炼油厂模拟恶臭废气(工业上排放的恶臭废气主要是含硫含氮的挥发性有机废气)的治理。

Thus the pulse parameters were determined based on examination of the microstructure, grain size, hardness and tensile strength of the deposits obtained at different average current densities with constant pulse-on time (ton =2 ms) and pulse-off time (toff= 45 ms).

结果表明，在恒定脉冲模式下(脉冲导通时间2ms，脉冲断开时间45ms)，镀层晶粒尺寸随电流密度的上升而明显下降，硬度与强度则显著上升，当电流密度超过8A/dm2时，抗拉强度开始急剧下降而硬度保持6kN/mm2的高位基本不变，当超过12A/dm2时，硬度也开始下降。

It is also known as one of the most poisonous naturally occurring substances.

它也被称为一个最自然发生的有毒物质。

The greatest stress is found at the location on the cross section where V is the largest.

最大应力出现在横截面上V为最大的地方。