The paper introduces the basic cause of the sparkless space dispersion for DC motor with the wide adjustable speed ratio, and gives the control methods of projects.

本文论述了宽调速比直流电动机无火花换向区曲线分散的基本原因，并给出工程控制措施。

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Using ball mill mixture process. the fibers dispersion is uniformity and its aspect ratio can meet the demand.

采用干法球磨混合分散可以使纤维在耐火基质中分散较均匀。且纤维长径比满足要求。

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Utilizing phase modulator and dispersion compensation fiber (DCF) link, a non-return-zero (NRZ) data format is converted to return-zero (RZ) data format with tunable duty ratio.

提出了利用相位调制器和色散补偿光纤(DCF)把非归零(NRZ)码信号转换成为占空比可调的归零(RZ)码信号的方案。

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