Switched reluctance motors(SRM)with full-pitch windings and segmental rotors are particularly suitable for the drive systems in aerospace environments because of low wind(oil)resistance and iron losses at high speed.I...Switched reluctance motors(SRM)with full-pitch windings and segmental rotors are particularly suitable for the drive systems in aerospace environments because of low wind(oil)resistance and iron losses at high speed.In this paper,the authors have been studying electromagnetic design of this motor.展开更多
文摘目的:描述通辽市社区居民老年期痴呆流行病学调查的抽样设计、权重计算、调查工具、现场执行及质量控制方案。方法:采用三阶段不等概率抽样设计在内蒙古自治区通辽市调查65岁及以上的常住居民,采用10/66老年期痴呆系列研究(10/66 Dementia Research Group,10/66 DRG)评估工具获得老年期痴呆的疾病诊断,以计算机辅助个人访谈模式开展调查,并实施调查全程及时质量控制措施。结果:在通辽市9个旗/县/市/区的166个嘎查/村/居中共调查老人4345人,应答率为96.2%。计算抽样设计权数、无应答调整权数和事后分层调整权数后,将上述权数相乘并进行极值调整和标化调整,从而获得最终权数。171名访员接受培训,考核合格后开展入户调查,并采用计算机数据核查、录音核查和电话核查等质量控制措施,保证调查的真实性。结论:本调查采用严格的抽样设计和质量控制措施实施调查,并采用国际效度和信度满意的10/66DRG评估工具作为调查工具,具有国际跨文化可比性,可以为国内其他地区开展老年期痴呆流行病学调查提供方法学参考。
文摘Switched reluctance motors(SRM)with full-pitch windings and segmental rotors are particularly suitable for the drive systems in aerospace environments because of low wind(oil)resistance and iron losses at high speed.In this paper,the authors have been studying electromagnetic design of this motor.
