pulse-modulated bridge

Results of the computations show that on overline bridge a pressure pulse occurs while a train passes.

结果表明，高速列车通过时跨线天桥表面受到空气压力波的作用，压力系数的波动范围为－0.135～0.095。

The mathematic models of the 12-pulse uncontrolled bridge rectifiers which work in different load current and reactor factor are analyzed and concluded in the paper. The operations of the 12-pulse uncontrolled bridge rectifiers with and without IPT are simulated by Matlab/ Simulink.

城市轨道交通供电的电气计算部分，本文采用Matlab/Simulink仿真了不带IPT和带IPT接线的十二脉波整流机组在不同负载电流、电抗因素下工作情况，并分析和总结了其数学模型。

The error includes two sides, one is the calculation error about Wheatstone bridge circuit, and another is the effect of the sharp pulse producing when test current is loaded on the sample.

系统误差分析分为两个方面，一是与惠斯顿电桥电路有关的计算误差；二是测试电流脉冲加载时出现的尖脉冲引起的误差。

Laser pulse control of bridge state electron transfer in heterogeneous structures

异质结中桥分子电子转移的飞秒激光控制研究

The design of power in accordance with ordinary laboratory user requirements, parameters of the proposed based on pulse width modulation ( PWM) high efficiency, low power switch power dc voltage converter design method, adopts full bridge, step-down, mainly push-pull loop circuit topology.

本设计依照普通实验室用户对电源参数的要求，提出了一种基于脉冲宽度调制（PWM）高效率、低功耗开关电源直流电压转换器的设计方法，采用全桥、降压、推挽回路为主电路拓扑。