绕线转子异步电动机转子频率鉴频调速

介绍了利用绕线转子异步电动机转子频率控制电机转速的新方法.文中阐述了这种新方法所用控制器的结构、工作原理;展示了原理波形.该控制器是静止的电子装置,可以替代常规的测速发电机,有很强的实用价值.     

Older People and Permanent Care: Whose Decision?

This paper looks at decision making when older people enterpermanent care, and focuses on power issues. The recent pastis reviewed and related to aspects of the current picture. Dementiaand capacity are a specific focus. The complexities of the workfor practitioners, together with their sometimes difficult workingenvironments, engender a climate which can be counter productiveto protecting the self-determination of older people.     

步进电机最佳变频控制研究

通过讨论功率步进电机的运行频率与输出转矩之间的动力学关系,提出了电机输出最大转矩的变频控制新方法。该方法对机床等机械设备进行技术改造,实现经济型数控系统具有实用价值。     

北京机动车环境外部成本的测算

针对噪声污染、大气污染、气候变化、土地资源占用等4种主要机动车环境污染,通过定量方法测度2006-2014年北京市机动车的环境外部成本。结果表明:机动车环境污染代价不仅受实际污染量、剂量暴露率等因素影响,还受当地疾病成本、人均收入、碳税价格和心理预期费用等机会成本因素约束,不同的成本体系测算出来的污染代价差异显著。以北京当地成本为例,2006年起北京机动车环境总代价有缓慢上升趋势,年平均增长6.7%,其中空气污染占比最大。环境总代价占当年GDP的比重平均约为0.56%,但污染的相对代价有所减少,且呈现下降趋势。机动车限制政策对环境污染影响有正面的影响效果,2012年以后这种效果逐步减弱。在此基础上,在政策层面认为应通过技术手段,改善机动车尾气污染;增加降噪设备,规范行为;加强重污染天气的预报等综合性手段,以控制机动车的外部性污染问题。     

螺杆钻具马达线型的优化设计

应用齿轮啮合理论原理，采用三次样条函数作为拟合曲线进行数值分析，得到离散的定子与转子共轭线型.以简单函数寻找解析解的方法为基础，扩散到以数值分析为基础寻找优化解的范围.将简单函数求解法与三次样条插值法进行比较，证明了优化方法的有效性与可行性.     

A log-logistic regression model for a transition rate with a starting threshold

The paper presents a new type of parametric transition rate model that is particularly suitable for studying household and union formation. In such studies, it is often not easy to determine the moment at which individuals actually enter the population at risk - or at least when the risk begins to become socially important. Even in the presence of regulations stipulated by law, one might be interested in studying ‘social’ timetables. We assume that there is a constant rate for any duration and that after a certain threshold point a log-logistic rate is added, with this threshold as its time origin. This can be justified in a behavioural sense by assuming that random and social transitions arise from separate processes. We then apply the model to union formation in Italy and show how threshold and intensity effects generated by theoretical hypotheses can be revealed.     

人心决断:和平的堡垒——卡尔·雅斯贝尔斯对康德《永久和平论》的解释

雅斯贝尔斯对康德的著名文本《永久和平论》进行了一种人道主义或者说生存论的解释:要实现真正的和平,政治决断、社会理念固然重要,但最重要的是"思维方式的革命",即人心的决断。与格哈德把《永久和平论》解释为政治哲学主题和哈贝马斯解释为社会哲学主题相比,雅斯贝尔斯的人道主义解释更有价值,也更易于理解。     

Lean Six Sigma applied to process performance and improvement model for the development of electric scooter water-cooling green motor assembly

Abstract

In response to the environmental issues triggered by global warming, worldwide companies gradually put the factor of carbon emission into the process of product lifecycle, developing green technology or adopting cleaner production aimed at sustainable development. Lean Six Sigma has advantages of cutting waste and facilitating process improvements as well as system analysis, helping enterprises create the overall business benefits in the value chain. Used in the renewable energy industry, it can promote the triple bottom line (TBL), the performance of sustainable production for corporate profit, social responsibility and environmental responsibility. Therefore, this work took the process performance of the electric scooter water-cooling green motor manufactured in Taiwan with the world’s highest density of scooters as a case study. The developed performance evaluation and improvement model for manufacturing scheduling and process quality achieved the goal of economic benefits of enhancing process quality performance by shortening manufacturing scheduling and reducing process variations with Lean Six Sigma. Besides, they could respond to the policy of energy saving and carbon reduction – replacing the traditional scooters of high-carbon emissions with the electric scooters of low emissions. Furthermore, they could bring enterprises into harmony with economic benefits, ecological benefits and social benefits.     

从心理词汇的存储谈大学英语词汇教学

本文从心理语言学的角度分析了记忆的工作方式和特点,强调在词汇附带学习中应该运用注意原则,并为词块教学法找到了心理依据。根据记忆的特点提出了在大学英语词汇教学中应该运用词块教学法,注重对学生词块构建能力的培养,为交际教学法之下的词汇教学提出了一些启示和建议。     

电动机转速检测的LabVIEW程序设计

基于美国N I公司的L abV IEW图形化编程语言,针对电机参数的检测进行虚拟仪器编程设计,开发出电动机转速和机电时间常数的在线测试系统。该系统分为人机界面,功能模块和外部电路三部分。具有很强的实用性,突破了传统仪器在显示、储存、读取方面的限制,有着成本低、兼容性强等特点。