基于客运量波动的城市轨道交通项目财务效益后评价分析

研究目的:城市轨道交通建设项目的决策和管理水平及其产生的效益越来越受到重视,后评价作为工程项目全生命周期管理的重要环节,正是满足这一要求的最佳手段.本文借鉴建设项目后评价理论与方法,结合城市轨道交通的特点,探讨基于客运量波动的城市轨道交通项目的财务效益后评价理论与方法.研究结果:根据城市轨道交通项目的特点,本文分析了财务效益后评价的内容,并从客运量的波动性建立城市轨道交通项目财务效益后评价的随机灰色系统模型,利用GM(1,1)模型对客运量进行拟合和预测,以此得到的客流数据作为财务效益后评价的基础数据.算例表明GM(1,1)模型能较好地反映客运量的变化发展规律,具有良好的外推性和准确度,适用于城市轨道交通项目的财务效益后评价.     

基于大规模定制的车型平台策略探讨

大规模定制是汽车市场竞争的方向,而平台化开发是实现大规模定制策略的有效手段。综合考虑产品设计开发阶段和制造阶段的关联性,结合CODP客户订单分离点制定合适的延迟策略,能够最大限度地发掘平台化造车的优势。     

电泳模拟分析及其应用

文章介绍如何应用有限元方法对电泳成膜情况进行评估,使车身设计在数据阶段评估电泳膜厚度成为可能,最终改善车身防腐性能。同时阐述该技术在某电动车型项目上的应用。     

地方海事行政执法难点探析

地方海事行政执法是法律法规授权的具有独立主体的行政执法,也是地方海事机构的主要社会功能和赖以存在的价值所在。本文根据笔者多年来海事执法实践,对地方海事行政执法过程中存在的外在执法难问题进行了综合分析,并提出了相应对策。     

上海口岸汽车物流的现状调研和分析

汽车工业已经成为上海工业的龙头产业。整个汽车产业面临的发展机遇,同样为汽车物流和汽车滚装码头装卸及其延伸业务开展的企业带来了良好的发展机遇。本文对上海口岸汽车物流的现状进行调研和分析,并提出物流发展对策。     

PREDICATING THE “WITS” APPRAISAL FROM THE ANB ANGLE

Objective In order to explore the relationship between the “Wits" appraisal and the ANB angle, and to see how accurately one can predict the “Wits”. Methods Given the ANB, lateral cephalometric radiographs were taken on 50 boys and 50 girls between the ages of 11～13. Results Each subject had no treatment either a Class Ⅰ or Class Ⅱ malocclusion, a good growth pattern. Group Ⅰ , 13 subjects of 100 had ANB≤1.5°, and negative “Wits” appraisal; group Ⅱ , 61 subjects had 5.8°＞ANB＞1.5°, and “Wits” appraisal either positive or negative; group Ⅲ , 26 subjects had ANB angle≥5.8°, and positive “Wits” appraisal. Statistically analysis showed that there was no sig nificant difference in sex (P＞0.05); there was significant correlation between the ANB and “Wits” values in the group Ⅱ and group Ⅲ (P ＜0. 05); there was statistical significance in regression analysis in the group Ⅰ and group Ⅱ (P ＜0. 05). We could predict the “Wits” with 21％ accuracy in group Ⅱ. Conclusion The results indicate that these figures are statistically significant but clinically irrelevant.     

Simulation of Old Urban Residential Area Evolution Based on Complex Adaptive System

On the basis of complex adaptive system theory,this paper proposed an agent-based model of old urban residential area,in which,residents and providers are the two adaptive agents.The behaviors of residents and providers in this model are trained with back propagation and simulated with Swarm software based on environment-rules-agents interaction.This model simulates the evolution of old urban residential area and analyzes the relations between the evolution and urban management with the background of Chaozhou city.As a result,the following are obtained:(1) Simulation without government intervention indicates the trend of housing ageing,environmental deterioration,economic depression,and social filtering-down in old urban residential area.If the development of old urban residential area is under control of developers in market,whose desire is profit maximization,and factors such as social justice,historic and culture value will be ignored.(2) If the government carries out some policies and measures which will perfectly serve their original aims,simulation reveals that old urban residential area could be adapted to environment and keep sustainable development.This conclusion emphasizes that government must act as initiator and program maker for guiding residents and other providers directly in the development of old urban residential area.     

黄山横江特大桥挂篮设计与施工

在黄山横江特大桥施工中利用贝雷片作为挂篮的受力杆件,文章介绍其结构形式、主要特点、结构计算和施工安装,对类似中小跨度的连续梁和刚构悬臂施工,有一定的借鉴作用。     

1600TEU集装箱船侧斜桨设计及首制船的试航分析

介绍一艘1600TEU集装箱船的侧斜桨设计及包括4只不同设计的侧斜桨模型比测试验。还给出两艘该首制船的试航结果及相关分析。到目前为止已有5搜1600TEU集装箱船投入国际航线参加航运。该船是目前全部由国内设计和制造的最大全集装箱船，其线型和螺旋桨设计之经中用于其他大型集装箱船的设计。     

迎接知识经济挑战、推进高校档案事业发展

知识经济带来了机遇，也带来了挑战。高校档案工作耍适应当前的形势，就要有所变革，无论是技术手段还是人员素质，或是管理机制都要与现代的高质、高效、全方位相适应。