基于近似网页聚类的Web文本数据挖掘技术

提出一种针对小文本的基于近似网页聚类算法的Web文本数据挖掘技术,以获得用户感兴趣的近似网页簇系列。试验证明,该算法在保证查全率和查准率的基础上大大提高了搜索效率。由于是针对小文本的数据挖掘,研究的算法时间和空间复杂度都不高,因此,有望成为一种实用、有效的信息检索技术。     

计算机联锁增加关键继电器后接点采集接口电路设计

针对集宁至包头段增建第二双线工程,完成了在计算机联锁系统中对涉及安全输入信息的关键继电器增加后接点采集的接口电路设计,实现了闭环逻辑安全运算检查,进一步提高了计算机联锁系统的可靠性及安全性。     

沥青混凝土路面施工中应把握的几个关键环节

结合工作实践,阐述了沥青混凝土路面施工中应把握的几个关键环节.     

Charging strategies for economic operations of electric vehicles in commercial applications

When substituting conventional with electric vehicles (EV) a high annual mileage is desirable from an environmental as well as an economic perspective. However, there are still significant technological limitations that need to be taken into consideration. This study presents and discusses five different charging strategies for two mobility applications executed during an early stage long-term field test from 2013 to 2015 in Germany, which main objective was to increase the utilization within the existing technological restrictions. During the field test seven EV drove more than 450,000 km. For four out of five presented charging strategies the inclusion of DC fast charging is indispensable. Based on the empirical evidence five key performance indicators (KPI) are developed. These indicators give recommendations to economically deploy EV in commercial fleets. The results demonstrate that the more predictable the underlying mobility demand and the more technical information is available the better the charging strategies can be defined. Furthermore, the results indicate that a prudent mix of conventional and DC fast charging allows a high annual mileage while at the same time limiting avoidable harmful effects on the battery.     

摩托车减震器限压弹簧的设计要点

限压弹簧是指采用处于材料边缘的设计指标,通过特殊的弹簧绕制工艺,来提高材料的强度和疲劳寿命,从而达到设计指标要求的特殊弹簧。对于重要用途的弹簧,绕制时一般需要强制压并处理,将弹簧数次强制压并超过材料的弹性极限,获得的应力与绕制中产生的内应力抵消,形成新的有利应力,从而提高弹簧的抗疲劳强度,延长弹簧的疲劳寿命。     

地效翼船大型化的关键技术和军事应用研究

本文指出了地效翼船的大型化发展趋势,分析了地效翼船发展的关键技术和军事应用上的问题,并探讨了地效翼船在军事上可能的发展方向.     

现代物流中心选址分析

合理地规划和设计物流中心,对于减少物流系统给城市发展带来的负面影响,改善城市的交通和生态环境、优化城市的功能布局、增强城市的载体功能具有十分重要的意义。结合增长极(Growth Pole)理论,对发展区域物流中心城市进行分析,确定选址方位,并以乌鲁木齐市作为案例进行论述。     

论高职院校学生关键能力的培养

“关键能力”的概念自提出后,已被应用于众多学科领域的研究。高职教育要特别注重学生职业能力的培养,除了一般意义上的职业技能以外,尤其应重视学生关键能力的培养。文章首先阐述了“关键能力”的内涵和基本特征,然后对高职学生关键能力的培养策略提出了自己的看法。     

Urban parking policy in Europe: A conceptualization of past and possible future trends

In the last two decades parking has increasingly gained importance in urban planning. Despite the growing number of papers published in recent years, an overall conceptualization of parking policy is still missing. Previous attempts (Shoup, 2005; Litman, 2006; Barter, 2010) focus mainly on the North American planning experience. We try to bridge this gap analysing the evolution of parking policy in Europe. In this paper we first present the key aspects of parking policy, and describe their generic evolution. Next we suggest a novel approach for parking policy making. We conclude by discussing some of the major challenges policy makers will face in the near future regarding parking in urban areas.     

350km/h以上速度条件下信号系统适应性及关键技术研究

对信号系统的车-地信息传输、列车定位、列车制动以及相应的安全可靠性等技术进行试验、验证和分析,以明确与运行速度相关的信号系统的关键技术要素,研究相应的解决方案。研究分析和现场动态试验结果表明,现有的信号系统在350km/h以上更高运行速度条件下仍有一定的应用空间,这一结论为更高速度条件下信号系统的发展和应用提供了指导和借鉴。