电力机车对外电磁辐射测试标准与方法的研究

随着我国环保标准的强化执行和人们环保意识的不断提高，电力机车的电磁兼容性已成为表示质量水平的重要指标，同时也是电力机车出厂型式试验的不可缺少的检测项目。本文着重阐述了国内外有关电力机车对外电磁辐射的标准，介绍了测试电力机车对外电磁辐射的具体方法和实例。     

Estimation of origin‐destination matrices for a multimodal public transit network

This paper presents a procedure for the estimation of origin‐destination (O‐D) matrices for a multimodal public transit network. The system consists of a number of favored public transit modes that are obtained from a modal split process in a traditional four‐step transportation model. The demand of each favored mode is assigned to the multimodal network, which is comprised of a set of connected links of different public transit modes. An entropy maximization procedure is proposed to simultaneously estimate the O‐D demand matrices of all favored modes, which are consistent with target data sets such as the boarding counts and line segment flows that are observed directly in the network. A case study of the Hong Kong multimodal transit network is used to demonstrate the effectiveness of the proposed methodology.     

未来之路——中国航母发展战略

众所周知，中国拥有960万平方千米的陆地国土，因此是一个陆地大国，但同时，中国也是一个海洋大国拥有总长3．2万千米的海岸线（其中陆地海岸线1．8万千米，岛屿海岸线1．4万千米），总面积8万平方千米的6000多个岛屿，濒海面积472．7万平方千米。依照《联合国海洋公约》的规定，中国应当拥有300万平方千米的管辖海域。我们应当对这片宝贵的海洋国土投入足够的重视。[编者按]     

关于漏解问题的探讨

“N 1”改造后,有关出发进路末端道岔区段漏解锁问题的探讨。     

A traffic flow simulator for short‐term travel time forecasting

This paper presents an off‐line forecasting system for short‐term travel time forecasting. These forecasts are based on the historical traffic count data provided by detectors installed on Annual Traffic Census (ATC) stations in Hong Kong. A traffic flow simulator (TFS) is developed for short‐term travel time forecasting (in terms of offline forecasting), in which the variation of perceived travel time error and the fluctuations of origin‐destination (O‐D) demand are considered explicitly. On the basis of prior O‐D demand and partial updated detector data, the TFS can estimate the link travel times and flows for the whole network together with their variances and covariances. The short‐term travel time forecasting by O‐D pair can also be assessed and the O‐D matrix can be updated simultaneously. The application of the proposed off‐line forecasting system is illustrated by a numerical example in Hong Kong.     

某电厂一期铁路专用线磁铁矿采空区分布特征与治理

在分析已收集既有采空区资料基础上，进行采空区地表塌陷测绘，用物探成果对采空区分布特征进行详细划分，再用钻探对物探成果进行验证。通过综合勘察方法，初步查明了线路通过处采空区的分布范围、规模，并提出了整治措施。     

企业电子商务的现状、应用及前景

叙述了电子商务的应用前景,探讨了企业电子商务应用的问题和措施。     

Exact Equations for Tractrix Curves Associated with Vehicle Offtracking

Vehicle offtracking behavior at low speeds is closely approximated by a geometric entity called a tractrix. This paper presents differential equations for generalized coordinates of a planar multibody vehicle model based on tractrix behavior. The equations are exact, can be used with any type of input path, are valid for forward and backward movements, and are much simpler than previously published formulations used to compute transient offtracking. The differential equations can be integrated using conventional numerical integration algorithms to obtain plots of the low-speed tracking performance of articulated vehicles. The equations were formulated symbolically by a computer program used to analyze the kinematic and dynamic behavior of multibody systems. Example numerical results are plotted.     

阿尔斯通开发的PRIMA 3U15型电力机车

阿尔斯通公司运输部开发了PRIMATM机车系列,其类型满足了运营部门提出的模块化和系列化要求.投放欧洲市场的PRIMA型电力机车既满足了通用性要求,又有助于与公路的经济竞争取得成效.为此,阿尔斯通公司继法国双流制机车后又开发了一种三流制机车,该型机车可用于法国、德国和瑞士之间的跨境运输.文章介绍PRIMATM系列的开发过程以及得到法国国家铁路的订单.详细叙述了PRIMA 3U15型三流制机车,重点是PRIMA电力机车的维修、可靠性和可用性.