A control strategy name PDF control is used in permanent magnet electromagnetism bearing. Then the model of PDF control system is founded.

采用伪微分反馈控制(PDF)策略对永磁电磁轴承进行控制，建立PD F控制模型。

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According to the feature of hydraulic servo system, the PDF control strategy is proposed, and simulation test is done based on the setup of control system model.

根据其液压伺服系统特点提出了P DF控制策略，并在建立控制系统模型的基础上进行了仿真试验。

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When you automate generation of PDF, you can begin to use all the techniques of software engineering: version control, abstraction, professional-quality backups, regression tests, and so on.

当您使PDF的生成自动化时，您可以开始使用软件工程的所有技术：版本控制、抽象、专业质量的备份和回归测试等等。

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Nationwide, 32.8% of students had texted or e-mailed while driving a car or other vehicle on at least 1 day during the 30 days before the Centers for Disease Control conducted its 2011 Youth Risk Survey (PDF).

FORBES: CDC Study: Too Many Teens Text While Driving