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变频器（Variable-frequency Drive，VFD）是应用变频技术与微电子技术，通过改变电机工作电源频率方式来控制交流电动机的电力控制设备。 变频器主要由整流（交流变直流）、滤波、逆变（直流变交流）、制动单元、驱动单元、检测单元微处理单元等组成。 电动机（Motor）是把电能转换成机械能的一种设备。 它是利用通电线圈（也就是定子绕组）产生旋转磁场并作用于转子（如鼠笼式闭合铝框）形成磁电动力旋转扭矩。 电动机按使用电源不同分为直流电动机和交流电动 …

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Identify patterns of FDG spatial distribution in brain PET of patients with MCI, AD, frontotemporal dementia, and dementia of Lewy Body. Identify the value and learn the appropriateness criteria for amyloid brain PET.

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2006年9月1日 · Several other studies have evaluated the role of 18 FfFDG PET in assessing response after completion of prefoperative chemotherf f apy and chemoradiotherapy in …