脉冲

The frequencies and intensities of the pulse producing bio-effects were dispersive and intervallic.

同时，能够在细胞胞浆Ca^2＋浓度的时-频域内产生生物学效应的电磁波脉冲频率和脉冲强度是离散的和间隔的，这意味着，ELF脉冲电磁波能够在细胞胞浆Ca^2＋浓度的时-频域内产生生物学窗效应。

FDTD numerical analysis and experimental simulation were carried out to study the shielding effectiveness of following models: metallic cavity with aperture and reinforced concrete layer exposed to the EMP plane wave, solid and meshy ferromagnetic shielding materials exposed to transient magnetic fields.

采用FDTD法作数值分析、进行电磁脉冲模拟实验，研究了有孔缝金属腔体、钢筋混凝土层对平面波型电磁脉冲场的屏蔽效能及其影响因素；实壁及网状铁磁屏蔽体对脉冲磁场的屏蔽效能。

This system uses a ring structure instead of complex multiangular optics structure.

导师王乃彦院士提出了应用激光能量储存环技术的多脉冲放大技术，这个技术是将种子光分解成同一方向上间隔相等的序列脉冲，通过放大器进行放大，放大的序列脉冲依次注入激光能量储存环中的拉曼池通过受激拉曼效应将能量传递给在激光能量储存环中的回转的一个stokes光，最后通过电光开关将经过多次放大的stokes光引出。

The neural network model simulates the visual characteristics of the human visual system by axons delay pulse neural network in order to extract the moving target and anlyse the actual significance of pulse neuroid algorithm.

这里提出一种基于神经轴突延迟机制，利用脉冲神经元网络模型对运动目标进行检测与跟踪的算法，该神经网络模型是利用轴突延迟脉冲神经网络模拟人类的视觉特性，从而提取运动目标，并具体分析脉冲神经元网络算法的实际意义。

First, a model of transformer has been built and analysed to formulate the expression of pulse on the load capacitor, which can demonstrate the influence of major parameters of transfomer on the charging time and efficiency of energy-transmitting. The influence of output pulse when the resistor of circuit is being took into account also has been analysed by the means of circuit simulation and approximate solution of circuit equation. The efficiency of energy-transmitting under dual nonresonant condition has been analysed and the parameters of transformer has been decided.

首先，对空心变压器的理论模型进行了分析，在得到了输出脉冲电压的表达式的基础上分析了变压器各主要参数对脉冲充电时间和充电时能量传输效率的影响；同时还通过近似求解状态方程的方法对考虑线路电阻时输出脉冲受到的影响进行了分析；讨论了在非双谐振情况下的能量传输效率的问题。

Experiment result indicates that laser power density,welding speed,pulse frequency and pulse width are the key factors of pulse laser welding and that the polishment,close touch of butt joint faces have an important effect on the air vents number in welding line and the mechanical performance of welding line.

实验结果表明：对焊面的打磨、抛光和紧密接触对防止焊缝中产生过多的气孔和提高焊缝的机械性能有重要作用；激光功率密度、焊接速度、脉冲宽度和脉冲频率四个参数是实现脉冲激光焊接的关键因素。

In AF, the regular electrical impulses of the sinoatrial node are replaced by disorganized, rapid electrical impulses which result in irregular heartbeats.

在AF时，窦房结的有规律的电脉冲被紊乱的快速电脉冲取代，该紊乱的快速电脉冲导致不规律的心跳。

The ADC and SNR of centrum semiovale,cingulate gyrus,thalamus, genu and splenium of corpus callosum were calculated separately,and were compared on both conventional DWI and FLAIR-DWI.

结果：扣带回和胼胝体压部的ADC值在施加FLAIR脉冲后显著下降，而半卵圆区、丘脑及胼胝体膝部在施加FLAIR脉冲前后无明显变化；5个部位的DWI图像信噪比在施加FLAIR脉冲后均显著下降（P〈0.01）。

The whole PWM circuit contains two subcircuit, the front-end is PWM module that make up of the counter that based on nine MOSFET True-Single-Phase-Clock D flip-flop; the back-end is demodulated module, which is consist of a three order Chebyshev low-pass filter used trans-conductor capacitor. All the subcircuits are simulated. At last, an approving simulated result of the whole circuit is given too.

在调制部分，利用九管单相时钟D触发器构成计数器，并由此组成了脉冲宽度调制电路，同时给出了在典型温度下的仿真结果；在解调部分，介绍了低通滤波器从无源到有源的设计方法，设计了三阶切比雪夫低通跨导电容滤波器，同样给出了相应的仿真结果；最后，作为将脉冲宽度调制电路和滤波器作为整体电路，以脉冲调频波为输入进行了仿真，取得了令人满意的结果。

352 Note: With totaliser in this mode (1 output pulse/unit - 1-pulse/bbl) it can be calculated that pulse output from totaliser is too slow for instantaneous EdgeX monitoring.

注：表头在此状态下（1输出脉冲/单位-1脉冲/桶）也可计算，但表头脉冲输出太慢无法满足数采系统瞬间产量的计算要求。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。