直流无级调速控制系统的设计

无刷电机既有有刷直流电机的优良性能,又有交流异步电机结构简单的特点,集两者优点于一体。无刷直流电机驱动和控制朝着通用数字信号处理和专用集成电路控制两个方向发展。本文着重介绍专用集成电路控制器的内容。     

脉流牵引电机调速的研究

本文针对ZD105型、ZD115型、ZD120型牵引电机调速进行研究、比较,发现机车调速操纵由复杂向简单过度,但机车牵引电机控制系统越来越复杂,并且向自动化方向发展。     

家用电动器具绕组极限温度的测试

阐述了在非下沉工作试验中考核、检验和电动器具的电机性能的原则步骤及注意事项。     

基于SVPWM的异步电机直接转矩控制系统研究

介绍了一种以TMS320LF2407A为核心的异步电机直接转矩控制系统.系统采用空间电压矢量脉宽调制技术得到逆变器的开关控制信号.实验结果表明,采用SVPWM 技术的异步电机直接转矩控制系统实现简单、性能优良,大大改善了电机的运行品质,提高了电压利用率.     

中国宏观消费的协整分析和误差修正模型

本文旨在对中国宏观消费、国民生产总值和零售物价指数进行协整分析,并使用EG两步法建立一个中国宏观消费的误差修正模型(ECM)。     

南京都市圈汽车、船舶产业互动发展研究

采取切实措施，把南京都市圈有较好基础的现代汽车、船舶产业做大做强是南京都市圈区域经济发展的必然选择。南京都市圈有条件建成我国重要的汽车、船舶产业基地，应当选择“科学导引，抢抓机遇，发挥优势，外引内吸，合作重组，做大做强”发展战略。南京都市圈各市政府必须有所作为，重视优秀企业家的领军作用，共同推进科技进步和技术升级，构建都市圈合作发展平台，建立以汽车、船舶产业为基础的新技术项目联合体。     

浅析运筹学方法在物流设备管理与维护中的应用--直线电机最大连续运行时间的计算方法

在对现有各种时间序列预测方法进行简要对比的基础上,从中优选出了修正的指数曲线模型进行了较为深入的研究,提出了应用于直线电机温度预测的计算模型。在此基础上,以深圳机场海关国际快件监管中心物流分拣系统使用的直线电机的历史数据为样本数据,开展了预测计算试验,对直线电机较长时间连续运行后的温度变化数值进行了预报。     

智能提醒药盒的电路设计研究

本文介绍的以STC15F2K60S2为核心的单片机,控制光敏电阻、发光二极管、步进电机驱动电路,形成取药判定与识别电路,设计研究出能按老人服药次数和时间能将药盒送入药盒的出药窗口,同时能判定与识别出老人放回药盒内是否有药,能用老人自家人的语音提醒老人吃药的智能提醒药盒电路。     

Non-seatbelt use and associated factors among passengers

Seatbelt use is the most effective way to save lives and reduce severe injuries. However, the percentage of non-seatbelt use is still high among drivers and passengers. Although the factors related to non-seatbelt use among drivers have been widely studied, the factors associated with non-seatbelt use among passengers have not been well documented. In addition, recent surveys showed that the driver's attitude has a significant impact on the passenger's seatbelt use. However, the lower response rate and less accurate of self-reported seatbelt use in survey studies, especially among participants who had a high level perception of penalty for non-seatbelt use. Therefore, we examined the association between passenger's seatbelt use and driver's seatbelt use with a statewide injury surveillance system. 36,012 passengers who were involved in motor vehicle crashes (MVC) in 2004–2013 were included in this study. Our results showed that if a driver wore a seatbelt, 92.6% of his/her passengers also wore seatbelts while if a driver did not wear a seatbelt, only 19.1% of his/her passengers wore seatbelts. Compared to the passenger whose driver wore a seatbelt, the passenger had a significantly higher probability of non-seatbelt use (odds ratio = 46.7; 95% confidence intervals, 42.7–51.1) if his/her driver did not wear a seatbelt. The driver has the greatest influence on the passenger's seatbelt use. The findings will provide important information for future public health practices to increase seatbelt use at the highest possible rate for passengers, such as educational interventions for drivers and seatbelt reminders use.     

Peer-to-Peer Value Through Social Capital in an Online Motor Neuron Disease Community

Millions of people affected by disability or chronic disease access social support and information through online health communities. These communities of common interest flourish on the Internet, with participants creating peer-to-peer value through social support and information exchange. This study observes a community of people affected by motor neuron disease creating value for themselves and each other within an online health community. The community is studied through the lens of social capital theory, a construct borrowed from the field of sociology that contributes to our understanding of why people gravitate towards these online communities for support and information. The results contribute increased awareness of how peer-to-peer value is created within online health communities and highlight the need for marketers to understand the implications of such communities on consumer behavior as it relates to health care.