客运专线与既有线共用GSM-R无线系统若干问题探讨

客运专线与相关既有线并行建设或存在交越情况时,二者存在共用GSM-R无线系统的可能性。若考虑共用无线系统,则会影响某些GSM-R业务的实现,因此,需要考虑相应的解决方案,此外,针对不同的情况,应考虑采用不同的无线组网原则。     

数字集群共网智能网组网设计方案的研究

本文研究分析了数字集群共网智能网组网设计方案及考虑原则，包括业务需求分析、用户预测和组网方案，并探讨网络规模和容量设计等关键的技术问题和需要重点考虑的内容。     

Performance Potential and Power Consumption of Slow-Active Suspension Systems with Preview

Two possible layouts of a slow-active suspension model are analysed. Optimal control laws for different actuator bandwidths and various amounts of road preview are generated, and estimates of power consumption are made. Higher bandwidth systems (10Hz) require less preview to obtain a given level of performance than those with a lower bandwidth (3Hz) but use more energy in doing so. Similar performance is available from the two systems considered, although the second uses considerably less energy to obtain that performance.     

浅谈静电在信号器材维护过程中的二次伤害

1 关于静电 静电作为一种自然现象而时刻存在着。当2种不同物质组成的固体相互接触后，一个固体上的自由电子会转移到另个固体上，其结果使2个固体分别带上等量异种电荷。当2个固体再次分开时，如果固体表面的电荷来不及中和，就会使固体带上静电。当静电通过人或其他接地导体向大地放电时，     

小导管注浆在处理公路隧道大坍方中的应用

某高速公路秦岭Ⅱ号隧道在穿围岩破碎带时发生坍塌,施工中采用小导管注浆超前加固,预留核心土环形分部开挖的处理方案,取得了良好的工程效果。     

浅析《北京市建设工程概算定额》——"第十三册地铁工程"通信、信号部分

京建市[2006]197号文发布了“关于颁发2004年《北京市建设工程概算定额》（第十三册地铁工程）的通知”（以下简称“本定额”）。自2006年4月1日起，凡北京市行政区域范围内编制地铁工程设计概算，均按本定额执行。本定额是北京市第一部地铁概算定额，也是国内第一部地铁概算定额，它填补了国内地铁工程概算定额的空白。     

资本结构决策的再思考

资本结构决策是公司财务决策的重要组成部分.随着MM理论的诞生,提出了资本结构与企业价值之间的相关性.特别是在MM有公司税模型下,企业负债达到100%的时候,企业价值达到最大.但是,负债率过高会严重的制约正常的经营运行和企业长远的发展.关于资本结构决策必须考虑到企业的竞争环境.     

波导公司海外目标市场的选择

尽管国际市场竞争日益激烈,但不充分竞争仍应是引导商品和资本在不同国家与地区之间流动的主动因.国际企业在国际经营中,如何面对海外纷繁复杂的市场环境,寻求市场机会,以尽可能少的风险、尽可能高的投资回报,成功开拓海外市场,其首要问题是选择正确的目标市场.本文以波导公司为例,阐述了其海外目标市场选择和进入策略,并从中得出对我国消费类电子企业的国际市场选择和市场进入策略方面的重要启示.     

Biochemical composition of marine sediment from the eastern Weddell Sea (Antarctica): High nutritive value in a high benthic-biomass environment

Within the SCAR's international EASIZ programme, as part of the benthic–pelagic coupling experiment, grain size and organic matter contents in marine surface sediment were measured. Samples were taken during the austral autumn of 2000 from 3 regions in the eastern Weddell Sea: Kapp Norvegia, Four Seasons Bank, and Austasen.In general, sediments were fine sand with a grain size fraction < 200 μm representing more than 40% of the total weight. The sediments from Four Seasons Bank (64 to 107 m depth) were coarser than those from Austasen and Kapp Norvegia (209 to 480 m depth), presumably due to winnowing of fine sediment at shallow depths. Organic carbon (OC) content ranged from 0.25% to 1.2% and constituted 10% to 97% of the total carbon. The samples from Kapp Norvegia presented the highest OC values. Overall, protein (PRT), lipid (LPD), and carbohydrate (CHO) contents were similar to those in sediment from cold regions (e.g., the North Atlantic and the Ross Sea) but higher than those in sediment from other Antarctic and more septentrional regions (e.g., the Ross Sea and the Mediterranean). The difference within the Antarctic is explained through the local conditions in Terra Nova Bay and Kapp Norvegia. In the Antarctic, PRT and LPD carbon were the main contributors to the biopolymeric carbon (BPC). In the eastern Weddell Sea shelf, the BPC accounted for more than 90% of the OC in most of the samples. More than 82% of the total PRT, LPD, and CHO were present in the fraction < 200 μm. This work remarks the existence of sediments with a high nutritional value persistent several weeks after the spring–summer pulse of fresh organic matter. It is also highlighted the high potential availability of these sediments (due to its grain size) for the benthic communities inhabiting this high-latitude continental shelf.     

我国北方国际航运中心的定位与发展研究

基于我国北方建设国际航运中心的思路,对传统的航运中心的概念进行了分析,并依托于对大连港各方面竞争优劣势的剖析,提出了环渤海湾乃至我国北方地区国际航运中心的新的定义,并对该地区国际航运中心的建设与发展提出了战略性发展的策略研究。