交流电机变绕组匝数拓宽调速范围的新方法

在典型交流电机调速应用领域需要拓宽电机的调速范围。传统的拓宽电机调速范围的方法主要包括弱磁调速、 变极调速以及改变绕组结构等。针对电动汽车驱动电机应用背景,提出了一种拓宽交流电机调速范围的新方法,即在维 持电机本体结构与变频器功率等级基本不变的情况下,利用由少量全控和不控电力电子器件构成的绕组调节功率变换 电路,实现电机定子绕组等效匝数的连续可调。仿真结果表明,定子绕组等效匝数是可以通过脉冲控制方法实现连续可 调的,应用该方法,可以拓宽电机的调速范围,使其适应不同应用场合对电机转矩曲线的要求。     

论抽象行政行为的可诉性--由孙志刚案引发的行政法问题思考

抽象行政行为因缺乏必要的法律监督而导致行政和司法实践问题丛生.惟有将抽象行政行为纳入行政诉讼受案范围,接受司法审查,才能健全对抽象行政行为的监督制度,进而推进依法治国的进程.     

Objective Tests versus Subjective tests

objective test has only one correct answer, while subjective test has a range of possible answers. Because of this feature, reliability will not be difficult to achieve in the marking of the objective item, while the marking of the subjective items is reliable. On the whole, a good test must contain both subjective and objective test items.     

Best bounds for order statistics and their expectations in range and mean units with applications

Best bounds for the order statistics are obtained in terras of the sample range and, for non-negative samples, in terms of the sample mean. Best bounds for the differences of two order statistics are found in this case also. Corresponding bounds on the expectation of order statistics and their differences are also found. Several applications of these bounds are considered     

Extension of two-sided test to multiple treatment trials

In a two-treatment trial, a two-sided test is often used to reach a conclusion, Usually we are interested in doing a two-sided test because of no prior preference between the two treatments and we want a three-decision framework. When a standard control is just as good as the new experimental treatment (which has the same toxicity and cost), then we will accept both treatments. Only when the standard control is clearly worse or better than the new experimental treatment, then we choose only one treatment. In this paper, we extend the concept of a two-sided test to the multiple treatment trial where three or more treatments are involved. The procedure turns out to be a subset selection procedure; however, the theoretical framework and performance requirement are different from the existing subset selection procedures. Two procedures (exclusion or inclusion) are developed here for the case of normal data with equal known variance. If the sample size is large, they can be applied with unknown variance and with the binomial data or survival data with random censoring.     

体验营销在中国的应用问题探讨

体验营销作为一种新型的营销理论和营销方式，目前在理论上尚未获得市场营销学界的共识，而体验营销的实践却鲜活得多。因此，本文重点探讨了体验营销的实际应用问题，包括体验营销的应用基础与应用领域、体验营销形式的适用范围与执行工具，并指出，目前中国企业开展体验营销应与现阶段的经济发展水平和服务营销质量相适应，注重契合消费者的心理需求属性，立足中国悠久的历史和文化，加强对国外先进的文化体验产品的学习与借鉴，并注意体验营销的管理与实效。     

企业集团合并会计报表若干问题探讨

讨论了企业集团编制合并会计报表的前提条件与理论基础，通过实例对比分析得出不同的理论基础对合并报表中有关项目造成不同的影响，指出了合并会计报表本身存在着信息揭示的不完整性，某些项目含义的不明确性和所依理论的缺陷性．     

试论精神损害赔偿

精神损害赔偿一直是学界和司法界关注的热点和难点,也是进一步完善我国法律制度必须要解决的课题之一。确立并完善精神损害制度,是出自维护权利的需要,也是权利人维护自身精神利益的必然前提。我国精神损害赔偿的法律依据是《民法通则》及最高人民法院的相关司法解释,但是对于精神损害赔偿的规定显得不够具体和完善。笔者将就该问题谈谈个人的看法。     

关于差动变压器式大量程位移传感器的探讨

介绍了差动变压器式大量程位移传感器的结构及工作原理,并对其组件选取、参数确定以及磁场、输出等特性进行了探讨分析.