动车组存车场消防系统研究

研究目的:通过对国内现有的地铁、轻轨车辆段列车存车线(库)及国外高速列车存车场消防设施的调研,以及对存车场火灾特性及成因的分析,找出客运专线动车组存车场消防的主要技术难点,研究不同规模动车组存车场消防系统的设置标准.研究结论:提出了不同规模动车组存车场消防系统的设置标准.     

Investigating the temporal changes in the relationships between time spent on the internet and non-mandatory activity-travel time use

The amount of time we spend online has been increasing dramatically, influencing our daily travel and activity patterns. However, empirical studies on changes in the extent to which the amount of time spent online are related to changes in our activity and travel patterns are scarce, mainly due to a lack of available longitudinal or quasi-longitudinal data. This paper explores how the relationships between the time spent using the Internet, and the time spent on non-mandatory maintenance and leisure activities, have evolved over a decade. Maintenance activities include out-of-home activities such as shopping, banking, and doctor visits, while leisure activities include entertainment activities, visiting friends, sporting activities, and so forth. Our approach uses two datasets from two major cross-sectional surveys in Scotland, i.e. the 2005/06 Scottish Household Survey (SHS) and the 2015 Integrated Multimedia City Data (iMCD) Survey, which were similarly structured and formed. The multiple discrete–continuous extreme value (MDCEV) model and difference-in-differences (DD) estimation are applied and integrated to examine how the relationships between the time spent on the Internet and travel have changed over time and the direction and magnitude of the changes. Our findings suggest that the complementary associations between Internet use and individuals’ non-mandatory activity-travel time use are diminishing over time, whereas their substitutive associations are increasing. We additionally find that such temporal changes are significant in the case of those who spent moderate to high levels of time on the Internet (5 h or more online) per week.

     

体外循环过程中红细胞免疫功能的改变

应用红细胞酵母花环试验和红细胞免疫调节因子一步测定法 ,对 30例体外循环过程中红细胞免疫功能及其调节因子进行测定。结果 :体外循环开始后红细胞C3b受体花环率明显升高 ,30 min时达到高峰 ,以后逐渐降低 ,但仍较转流前高 ,红细胞免疫复合物花环率无明显变化 ;红细胞免疫促进因子明显升高 ,而抑制因子明显降低 ,表现为红细胞免疫功能及调节功能紊乱。     

基于量子技术的目标探测研究

通过模拟人类视觉成像原理,将量子探测方法与技术,用于雷达探测,提出了量子雷达的概念。特别是提出利用激光的原理,用于雷达信号的接收与识别。量子雷达不仅克服了现有雷达功耗大,抗干扰性能差的弱点,而且探测距离更大,分辨率高且便于成像。     

信息技术对21世纪交通运输发展的影响

在即将进入２１世纪之际，在面对信息技术对社会带来日益深刻的影响之时，未来交通运输将如何发展是从事交通运输业的人们所关心的问题。本文从信息流与交通运输相关关系角度出发，比较了两者的特点，探讨了信息流对旅客运输和货物运输的影响。分析了信息时代交通运输的一些基本特征。     

Evaluation of factors for carrier selection in the China Pearl River delta

The efficient integration of logistics modes is critical for international cargo shipping. The local transportation connecting to the export port then plays a vital role in such integration. This paper investigates the problems of carrier selection in the China Pearl River delta area, with respect to international shipping. The analytical hierarchy process (AHP) model is constructed based on a comprehensive industrial interviews and statistical analysis. Rather than simply ranking the given alternatives, we use AHP is used to analyse the weakness and strength of impacting factors in carrier selection. The model is implemented under different types of shipper. Seven criteria are statistically summarized from the questionnaire for evaluating eight different modes. The results are useful to those liner companies serving the PRD region in relationship to port selection and fleet deployment.     

方中空夹层钢管混凝土双向偏压构件的承载力计算

采用纤维模型法对方中空夹层钢管混凝土双向偏压构件的荷载-变形全过程关系进行了计算；在此基础上，绘出了典型的承载力相关曲面，可供工程设计参考。     

ISO9001质量管理体系理论在工程监理中的管理应用

研究目的：ISO9001质量管理体系是国际上公认的、科学的、最先进的质量管理方法，监理企业如何正确理解和掌握ISO9001质量管理体系理论内涵及其在工程中的管理应用对企业的发展至关重要，因此有必要对ISO9001质量管理体系的八项管理原则、闭环式管理进行深入的阐述。研究结论：通过论述，得出监理企业应该正确贯彻ISO9001质量管理体系，使企业全员深刻理解ISO9001质量管理体系理论基础“八项管理原则”的内涵，提高贯彻国际标准的自觉性；实施P、D、C、A循环闭环式管理，强化管理过程控制，避免管理流于形式；认真进行管理评审，使企业监理服务质量得到提高，经济效益和社会信誉得到提升。     

日照港LNG码头配套航道及防波堤工程方案

日照港岚山港区北作业区规划新增LNG码头,针对其配套航道及防波堤工程平面布置问题,提出3个方案。采用数值模拟方法,推算不同方案下港池、航道,尤其是口门处的测点流速。计算结果表明,工程建设后,港池内各点在防波堤掩护下流速有所降低;受防波堤挑流作用的影响,口门位置处横流流速达到最大;以方案2流速相对较小,且流速大于某一值的持续时间较短。在方案2基础上进行优化,将一段防波堤调整为导流堤,由于导流堤上方可通过一部分水体,堤头附近航道横流有所减小。     

土性参数变异性对路堤稳定风险率影响分析

将有限元模拟、蒙特卡罗法与径向基理论相结合,建立了一个可用于评价土性参数变异性对路堤稳定风险影响的随机模型。以佛山"一环"南线K13+340为研究背景,分析了软土层粘聚力、摩擦角的变异性对路堤稳定风险率的影响,结果表明,软土层力学指标的变异性对路堤稳定风险影响显著,摩擦角的随机变异性对路堤稳定的平均影响大于粘聚力。