脉冲

From the angle of a beam-forming, the cross- range focusing principle of the synthetic-aperture radar based on nonsinusoidal waves is studied. The expressions of antenna pattern for both rectangular signa l and Gaussian signal are presented. Compared with the conventional narrow bandw idth SAR whose cross-rang resolution is determined by the carrier frequency, th e cross-range resolution of the nonsinusoidal SAR is affected by the signal ban dwidth.

为研究非正弦波SAR的方位向分辨力，从波束形成的角度分析了非正弦波SAR的方位向聚焦原理，导出了基于矩形脉冲和高斯脉冲的合成孔径天线阵列方向图表达式，并与常规窄带SAR进行比较，指出影响非正弦波SAR方位向分辨力的主要因素为合成孔径长度和信号带宽，而与信号载频无关。

To investigate the relationship between the impulse oscillometry method and plethysmogrophy used in measuring airway resistance,Using the two methods to measure the airway resistance and the ventilation data of 158 patients.

为探讨脉冲振荡法和体描法测定呼吸道阻力的关系，对158例患者分别用脉冲振荡法和体描法测定呼吸道阻力，同时测定测试患者的通气功能，对2种方法测得的呼吸道阻力进行相关分析，考察各组数据的分布情况。

This teehnology makes the pulmonary function test go well for children, especially for the children before school age, and also prorides a reliable basis for early diagnosis and early clinical treatment of respiratory diseases.In this paper, I will introduce the clinical applications of bronchiectasis test using impulse oscillometry for children.

脉冲振荡法(impulse oseillometry，10S)是近年来开展的一项肺功能检测，是以外部发生器产生矩形电磁脉冲，通过扩音器转变为各种频率的机械波作为测试源，叠加在被检者静息呼吸上，再通过计算机的复杂运算，可快速、精确得出呼吸系统总气道阻力、中心气道阻力、周围气道阻力和肺顺应性等各参数的数值。

METHODS: A total of 140 subjects with bilateral knee OA were randomized sequentially into 4 groups (groups I-IV). Group I received isokinetic exercises; group II received isokinetic exercise and pulse ultrasound for periarticular soft tissue pain; group III received isokinetic exercise, pulse ultrasound, and intraarticular hyaluronan therapy; and group IV acted as the control group.

140名患有双侧膝骨关节炎的患者（Altman分级II级）被连续地随机分配到4个组。I组进行等速运动；II组进行等速运动，同时，伴关节周围软组织痛的患者接受脉冲超声治疗；III组进行等速运动联合脉冲超声及关节内透明质酸治疗；IV组为对照组。

In general, the principle of seismic method is to send an impulse down into the earth and to measure the time until it comes back as an echo, reflected by petrographic boundaries in the underground.

总的说来，地震法的原理就是向地球深处传送一个脉冲信号，然后测量这个脉冲信号在遇到岩相边界后反射回发射点所需的时问。

By isualization the phased array pulse with a strobed photoelastic system the real picture can be seen.

使相控阵脉冲和光弹系统同步，而可以看到超声脉冲传播的真实照片。

Photothermic and photochemical action will be triggered by the radiation of IPL. On one hand, IPL will promote collagen reproducing and recombining which makes the skin more flexible and smooth. On the other hand, the light with long wavelength can easily pass through epidermis layer and will be absorbed selectively in priority by pathological pigments which will be destroyed by high heat, and get the effect of remove pigmentations, vascular lesions and unwanted hair.

当强脉冲光照射皮肤时，会产生生物刺激作用和光热解作用，一方面使皮肤中的胶原纤维和弹力纤维再生并重新排列，恢复皮肤弹性，从而减轻皱纹；另一方面，强脉冲光能穿透皮肤，被组织中的病变色素团优先选择性吸收，热能在不破坏正常皮肤组织的前提下，击碎病变色素团，从而达到治疗毛细血管扩张，祛除色斑，和脱除多余毛发的效果。

An analog prefilter;(2) an ADC;(3) a digital pulse shaper;(4) pulse selection logic;(5) histogram logic, and 6

波器；（2）模数转换器；（3）数字脉冲整形器；（4）脉冲选择逻辑单元；（5）条带逻辑

In the presence of L-isoproterenol (through local infusion into area CA1), the theta-pulse stimulation with the parameter of 10 Hz, 150 pulses/train, 1 train, a frequency weakly modifying synaptic strength, induced a robust LTP, and this effect was blocked when DL-propranolol was co-administered. By contrast, the theta-pulse stimulation with the parameter of 5 Hz, 150 pulses/train, 3 train, a frequency strongly modifying synaptic strength, induced a significantly smaller LTP when DL-propranolol was administered into area CA1. Accordingly, DL-propranolol impaired rat's spatial learning in the water maze when infused into area CA1 20min pretraining.

正常情况下对突触传递效能仅有微小调制作用的10Hz的θ节律刺激（每串150个脉冲，1串），在CA1区局部给予L-异丙肾上腺素后，显著地诱导出LTP，这一效应可被DL-心得安所阻断；相反，正常情况下对突触传递强度有显著调制作用的5Hz的θ节律刺激（每串150个脉冲，3串），在CA1区局部给予DL-心得安后，所诱导出的LTP被显著压抑。

Pulse detonation engine is a new concept of propulsive engine which uses high temperature and pressure gas produced by intermittent or pulsant detonation wave to generate thrust. PDE has many desirable advantages, including high thermal dynamic cycle efficiency, low specific fuel consumption, high thrust/weight and specific impulse, simple configuration, and will become propulsive device of aviation and spaceflight aerocraft in 21st century.

脉冲爆震发动机是一种利用间歇式或脉冲式爆震波产生的高温、高压燃气来产生推力的新概念发动机，这种发动机具有循环热效率高、燃料消耗率低、推重比高、比冲大、结构简单等优点，将成为21世纪新型的航空航天飞行器的动力装置。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。