渝申300 TEU 集装箱标准船型研究

本项目是根据交通部到2010年底前在长江、珠江三角洲水网地区基本实现船舶标准化的战略目标,推进川江及三峡库区船型标准化的西部交通建设科技项目.主要介绍渝申300 TEU江型集装箱标准船型的总体设计,重点研究该船的主尺度分析、快速性、总体布置.并对全船概况、船舶技术性能评估等方面进行了介绍.本船具有良好的经济性指标,比国内同类型船快速性指标提高4.4%,千吨公里油耗降低4.8%,单位功率载箱量提高14.3%,已达到国内先进水平.渝申300 TEU集装箱标准船型是目前设计的三峡库区尺度最大、载箱量最多的集装箱标准船型.     

西方航运资本的入侵与上海的近代海运业

鸦片战争之后西方资本入侵中国，洋轮直驶我国沿海江河，传统的木帆船运输业受到剧烈冲击，急速衰落，但以轮船为标志的近代海运业出现了。上海的近代海运业由外国资本、本国官僚资本和民族资本等３种成份构成。西方资本的航运企业垄断上海的航运业达１００年，掠取了中国人民的巨额财富。官僚资本的轮船招商局在西方资本航运企业的刺激影响下出现，又在其排挤、打击下艰难地生存和发展。民族资本的轮船公司深受西方资本和官僚资本的双重抑制、打击，生存更为艰难，历程异常坎坷。     

长江三峡两坝间泄洪期船舶上水过滩能力研究

三峡-葛洲坝两坝间河段是川江船舶航行最困难的航段之一。研究在该航段航行的3种船型在泄洪期安全上水过滩的通航能力,分析计算相关船型在各种流量流速条件下安全上水过滩应具备的对水航速和对岸航速,总结出两坝间河段最危险的航段,为船舶安全上水过滩和有关部门制定船舶安全通行的政策和限制政策提供依据。     

A cell-based Merchant-Nemhauser model for the system optimum dynamic traffic assignment problem

A cell-based variant of the Merchant-Nemhauser (M-N) model is proposed for the system optimum (SO) dynamic traffic assignment (DTA) problem. Once linearized and augmented with additional constraints to capture cross-cell interactions, the model becomes a linear program that embeds a relaxed cell transmission model (CTM) to propagate traffic. As a result, we show that CTM-type traffic dynamics can be derived from the original M-N model, when the exit-flow function is properly selected and discretized. The proposed cell-based M-N model has a simple constraint structure and cell network representation because all intersections and cells are treated uniformly. Path marginal costs are defined using a recursive formula that involves a subset of multipliers from the linear program. This definition is then employed to interpret the necessary condition, which is a dynamic extension of the Wardrop’s second principle. An algorithm is presented to solve the flow holding back problem that is known to exist in many discrete SO-DTA models. A numerical experiment is conducted to verify the proposed model and algorithm.     

大学城对区域经济发展的影响研究——以西部大学城为例

大学城建设作为新的区域发展工具已经引起了社会各界特别是各级政府的关注.文中在对西部大学城实地调研的基础上,具体分析了西部大学城的建设对长安地区服务业、高新技术产业、文化旅游业、房地产开发等方面的影响,并提出了在此过程中需要注意的问题及对策,为今后西部大学城与长安区及其周边其它地区经济协调发展提供了一定的理论参考.     

冰冻地区公路路基边坡的防护措施

北方冰冻地区公路建设中如何保持路基边坡稳定,对自然植被遭破坏的边坡如何进行恢复与保护,以防止边坡水毁及减少土壤侵蚀与流失的工程措施进行了探讨,提出公路边坡防护方案,并将其运用于实际工程实践。     

基于网络技术和GIS的公路建设可视化项目管理系统的研究与应用

介绍了公路建设可视化项目管理系统的研究与应用。阐述了采用地理信息系统(GIS)技术、数据库技术和网络技术在公路建设项目可视化管理集成系统平台中的研究;并概述了对试验检测、质量评定、计划进度、工程图文及档案资料管理等子系统的研究与应用。展望了C/S结构和B/S结构在公路建设管理软件开发中的应用。     

山区河流弯曲分汊浅滩整治技术研究

结合川江铜鼓滩的整治情况,对山区河流弯曲分汊浅滩水流运动特性、卵石输移运动规律、浅滩碍航特征、整治措施等弯曲分汊类浅滩的整治技术进行研究,归纳出弯曲分汊浅滩治理要点,为弯曲分汊类浅滩的整治工作提供借鉴.     

SCGE modelling in cost-benefit analysis: The Dutch experience

Spatial computable general equilibrium (SCGE) models offer opportunities for computing wider economic effects in cost-benefit analysis (CBA) in a theoretically satisfactory way. This is important for the correct estimation of additional economic benefits and international relocation impacts. In the Netherlands, this potential has only been reached partly. Many different types of models are actually used, none of which yet covers all relevant markets. In CBAs carried out in recent years, ad hoc methods were used more often than models, let alone SCGE models. Moreover, the usual presentation of the model outcomes appears as a ‘black box’ to policy makers. There is much work to be done, in extending SCGE models to strengthen their empirical basis, and in improving the presentation of the outcomes.     

长联空心板拼接方案研究

对于原桥为长联结构连续空心板结构,研究满足结构受力、施工及运营安全需要的最佳方案。以广深高速太平立交主线桥为例,对该桥拼接结构进行了构造设计和计算分析,结果表明,对于长联空心板拼接,扩建桥采用简支结构刚性拼接方式、可减少新老桥收缩徐变差;端部宜采用刚性横梁连接以平衡新老桥挠度角差。