渭河特大桥钢-砼结合段施工技术

以西铜高速公路渭河特大桥钢-砼结合梁段施工为背景,从钢箱梁的加工、运输、吊装就位及钢-砼结合梁段施工过程、工艺特点等方面进行了介绍,经工程实际应用,证明该工程技术施工原理清晰,成效明显,易于掌控,节约成本,可为以后类似桥梁施工提供参考经验。     

重庆轨道交通P+R换乘研究

根据重庆道路交通现状及重庆城市轨道交通发展状况,分析重庆轨道交通发展P+R换乘的可行性。并提出对P+R车场管理的若干建议。     

Spatial econometric analysis of automobile and motorcycle traffic on Indonesian national roads and its socio-economic determinants: Is it local or beyond city boundaries?

The purpose of this paper is to verify the justification provided for a centralized national road policyin Indonesia, namely, that trips on national roads are typically inter-urban, by measuring the spatialdimensions of automobile and motorcycle trips on national roads in Indonesia. The study finds thatmotorcycle trips are characteristically local; by contrast, automobile trips extend beyond city boundaries,although to a limited extent. The results suggest the decentralization of transportation policies for thedevelopment and maintenance of national roads by granting autonomy to local governments when nofiscal externality exists. The results also indicate that road capacity, gasoline prices, income, populationand worker density, city size, and the number of public buses are strong predictors of vehicle kilometerstraveled.     

R/S分析法在盾构下穿机场过程中的地表变形规律研究

为保证机场的正常运营,在盾构下穿机场的施工过程中,对地表沉降变形控制的要求较高,因此对穿越过程中的施工控制和变形规律研究具有重要意义。首先,基于盾构下穿机场的工程条件,分析盾构下穿过程中的风险,并提出相应的控制措施;同时,根据现场监测数据,分析盾构下穿机场过程中的地表沉降变形规律,并利用R/S分析法对地表沉降的发展趋势进行研究。结果表明:盾构施工引起的机场地表变形均在控制值范围以内,且各监测点在不同序列条件下的Hurst指数均大于0.5,具有沉降持续减弱的趋势,验证下穿过程中风险控制措施的有效性,为类似下穿机场的盾构施工提供一定的实践经验,也为盾构施工引起的地表沉降变形规律研究提供参考。     

强受力甲板机械环氧垫块实际应用

甲板机械底脚配装的垫块尺寸变大,不仅提高设备安装的工艺要求,而且增加重量。采用环氧浇注垫块可显著提高安装的工艺效果,免除设备底座的精加工要求,降低垫块重量。以铺管船弃置与回收(Abandonment and Recovery, AR)绞车环氧垫块为例,介绍强受力甲板机械环氧垫块的应用分析及在环氧强度计算中强度不符的优化方法。     

Congestion tolling in the bottleneck model with heterogeneous values of time

When analysing the effects of transport policies it is important to adequately control for heterogeneity: previous studies note that ignoring heterogeneity biases the estimated welfare effects of tolling. This paper examines the effects of tolling, in a bottleneck model, with a continuously distributed value of time. With homogeneous users, first-best public tolling has no effect on prices. With heterogeneity it does: low values of time lose, and high values of time gain. The average congestion externality decreases with the heterogeneity in the value of time. Consequently, the welfare gain of first-best tolling also decreases. The more heterogeneous the value of time is, the lower the relative efficiency of a public pay-lane. This finding contrasts with the previous literature. Earlier studies, using static flow congestion, conclude that the relative efficiency increases with this type of heterogeneity. With more heterogeneity in the value of time, the relative efficiency of a private pay-lane is also lower, while that of a public time-invariant toll is higher. Our results suggest that the welfare gains of different tolling schemes are affected differently by heterogeneity. Further, the impact of heterogeneity on the effects of a policy also depends on the type of congestion considered.     

我国玻璃钢救生艇产业发展现状及前景展望

分析当前我国玻璃钢救生艇产业的发展现状,针对与国外知名品牌相比存在的差距以及救生艇船员由于误操作引起人员死亡的情况,提出该行业发展的应对措施和建议。     

ZPW-2000R型无绝缘移频自动闭塞系统

简要介绍了ZPW-2000R型无绝缘移频自动闭塞系统的构成、原理和特点，重点介绍了系统的主要功能和自诊断方面的特点。     

800kV组合电器用金属波纹管补偿器检验控制

简要说明800 kV组合电器用金属波纹管补偿器小型化发展趋势,详细阐述了该产品质量控制的各个环节：原材料验收、铸铝法兰剪切力试验、部件尺寸及外观检验、无损检测控制、密封面平面度检验、内保护套铆接后质量检验、水压试验和SF6试验、型式试验等。     

Caterham Seven 420R v Porsche 911 GT3 RS

在赛道作为一条经验法则,除非420R在打滑,否则其实它根本没用尽全力。它会转向不足——其实有时还挺有用的,如果你非要找到它的极限并再用力推过头一点点的话;但如果你就是入弯时对前胎要求过高那它就那么有帮助了。Seven之妙处在于驾驶者可以立刻知道当前的情况。你完全可以在入弯到