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。     

教育中的公平问题：以借读费为例的道德分析

文章试图从实践伦理学的角度切入分析义务教育中的"借读费"问题.在界定借读费的基础上,检讨借读费存在的理由.受教育权,因为公共物品拥挤,市场的介入,而遭到了损害.这种损害得以辩护的伦理理由是,地方性的道德压倒了普遍性的公民资格及其相应的权利.驳斥地方性,甚至说,具有模糊边界的共同体道德是本文的主要论域.     

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.     

Criteria for selecting a production control philosophy

Logistic objectives constitute a compromise between having short leadtimes and a low volume of work in progress on the one hand and a high resource loading and due date obligation on the other. Miscellaneous production planning approaches offered today provide different combinations of logistic objectives for satisfying a manufacturing strategy. To combine the strength of the various approaches into a unified system, a new approach based on a dynamic and distributed production planning methodology is proposed. To customize the approach, various analyses and specifications have to be made and for that reason some important characteristics and criteria for analysing production control philosophies will be given.     

Constrained production lot-size model with trade-credit policy: 'A comparison geometric programming approach via Lagrange'

In this paper our main objective is to investigate a deterministic inventory production lot-size model with a permissible delay in payment under a restriction. We analyse our deterministic inventory model under a restriction which will be assumed as the average inventory level. In fact we use in our analysis two approaches: the geometric programming approach; and the Lagrange method. Then a comparison between these two approaches is performed, which is our aim. Finally we deduce some previously published works of other researchers as special cases.     

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。