Its software is designed to calculate the running parameters of the AC drive system, including transformer, quadrant rectifier, DC circuit, inverter, AC motor and train load.

系统采用软件方式实时计算交流传动系统的运行参数，包括变压器、四象限整流器、直流中间回路、逆变器、电机及负载。

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The output amplitude and the length of pulses train are greatly improved with additional semiconductor optical amplifier and filter in the optical fiber loop as the DC component of input keeps low.

光纤环形腔中光放大器、滤波器的加入，以及光脉冲直流基座的降低，可以明显改善输出的幅值和复制序列长度。

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Recently I was on a train to DC, thinking about human beings as tribal creatures.

FORBES: Support the Tribe

In 2012, the Greenbrier Presidential Express will provide train service between Washington, DC and the resort.

BBC: Openings: Quito, West Virginia, Agra, Oman