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On the aspect of ultrasonic wave Transmit and Receive, we use two probes to realize the switching between transmitting and receiving mode; we also adopted a transmitted scheme based on intermissive multi-pulse, which develops the Time Difference with Interpolation, uses digital filter to adjust the waveform, and calculates the Time Delay with Correlation Arithmetic.

在超声波发射和接收方面,系统采用了两个探头进行发射和接收的切换,并采用了一种间隙式多脉冲发射方案;接收并采集数据后利用软件插值来提高时间分辨率,再用数字滤波来调整波形,最后用相关算法进行数据的相关运算,从而计算出时延得到流速。

It has the injection energy of 3.5MeV and will provide to deliver adose of about lOGy per 2 minutes.

注入系统体现了医院专用装置所要求的简单、经济和高可靠性的特点,它由强度较为合理的铜切割器和电脉冲偏转板所组成,注入能量为3.5MeV并能够在2分钟的时间内,提供剂量达10Gy左右的治疗流强。

The experiment on electromagnetism pulse biology effect could suggest that quantities-effect of EMP effect on system morphemic and function with applying different frequency, power and expose time. Combined with epidemic investigation and medical psychological research in EMP researcher, the immediate, early stage and middle and long-term biological effect of EMP was elucidated and EMP protection standard was established.

电磁脉冲(electromagnetism pulse,EMP)生物学效应实验是通过应用不同频率、功率、暴露时间的EMP照射动物,明确EMP所致各系统形态和功能危害的量效关系,探索其效应机理;并结合对EMP从业人员的流行病学调查和医学心理学研究,揭示EMP所引起的即刻、早期、中期和远期生物学效应,提出EMP卫生防护标准,为物理防护和医学防护的研究提供重要的理论依据和实验依据。

Especially, with the improvement on microelectronic integrating technique and the development of hegh-speed electronic devices in the recent decade, the rise time and width of working pulses have been reduced to the ps range in high-speed digital circuits. In such fast pulses there are microwave and even milliwave components, so analysis of the time-domain response of multiconductor tuansmission lines used as interconnects in high-speed integrated circuits must be performed to ensure the normal working state, Much research work has been done and many analysis methods have been developed.

近十年来随着微电子集成工艺技术的提高和高速电子器件的发展,高速数字电路的工作速度提高迅速,脉冲信号的上升时间和宽度已缩短至ps量级,对应的频谱已进入微波甚至毫米波波段,这种情形下对信号连接线的时域响应加以分析就成为保证高速电路正常工作的必要环节。

Presented in this paper is the process of design a fast pulse-charger for lead-acid battery. The charger is mainly designed for nonspillable lead-acid assembled batteries that used in automobiles, proposed working envirments are home and outdoors,main requirements are short charging time, high charging efficiency, smart control methods, reliable work,efficiently increase the life of batteries.

本文介绍了一个铅酸蓄电池脉冲快速充电装置的研制过程,这一装置以汽车用密封铅酸蓄电池作为主要充电对象,以家用及室外环境卫主要工作环境,主要设计要求为充电时间短,充电效率高,控制智能化,运转安全可靠,能够有效延长蓄电池寿命。

The conventional SHPB technique is improved by using a pulse shaper. Pulse shapers technique is used to modify the incident wave and decrease the effect of wave dispersion to ensure stress equilibrium and homogeneous deformation in specimen, and furthermore a constant strain rate is attained during the loading history. The lasting time of acceleration pulse is enhanced to numerable MSEL, which is more close to actual loading.

本文改进了传统的霍普金森压杆技术,采用波形整形技术,改变加载波形,获得了比较光滑的入射波,降低了波的弥散效应,保证实验时火工品试样中的应力平衡和均匀变形,得到了更接近常应变率的动态加载条件,使加速度脉冲持续时间t提高数倍,更加真实的反映了火工品实际加载环境。

Key words Laser surgery; Pulpotomy; Histological techniques

应用脉冲Nd∶YAG激光切髓时,应严格控制照射时间。

The saturation time of saturable pulsed transformer and magnetic switch are 47μs and 1.4μs.

可饱和脉冲变压器和磁开关磁芯的饱和时间分别为47μs和1.4μs。

First the input signal processed by the high-speed optocoupler and the sample circuit,then 89C55WD using two 32-bit timers surveyed time interval of the seriate pulse in inte.

首先,将输入的信号经过高速光耦合器和采样电路处理;然后,89C55WD在中断方式下利用两个32位计时器交替对连续脉冲信号的间隔时间进行测量。

Using digital signal processor can reduce the calculating time. Since the control pulses of axes are synchronistical during timer interrupt periods, the interpolating trajectory are significantly improved.

利用数字信号处理器进行三次B样条曲线实时插补,可缩短插补计算时间;通过设定DSP的定时器中断来实现各轴控制脉冲的发送,可实现最大限度地减少折线状的插补轨迹的目的。

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The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作:对伸臂位于顶部的单层框架—筒体模型进行分析,提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。

Its advantage is that it can be used in smaller units.

其优点在于可以在较小的单位中应用。