油库安全阀的选用参数计算和确定方法

阐述了油库常用安全阀排量、口径、开启压力的计算和确定方法,重点分析了油库和机场特定部位安全阀开启压力和公称通径的计算过程和考虑要素,并说明了安全阀定购和使用中的注意事项.     

军用机场净空新规定与原规定的比较分析

针对使用单位在应用《军用机场净空规定》的过程中,容易将新规定与原规定内容混淆的问题,分析比较了机场净空新旧规定的差异,对新规定中净空要求的基本原则、净空区组成和障碍物限制要求等方面的修改进行了详细分析。通过比较分析新旧规定的区别,有利于使用者更好地理解和应用新规定。     

设置导流岛的信号交叉口交通流特性研究

应用统计推理方法分析设置导流岛后信号交叉口交通流特性.结果表明,设置导流岛后交叉口行人和自行车到达符合泊松分布；行人和自行车分三阶段过街;机非冲突集中在右转车道的人行横道上,机非冲突面大大缩小.     

黄山区龙门至甘棠桥梁安全分析

山区旅游道路桥梁设计应遵循美观和有利环保的原则，考虑“因地制宜、就地取材、便于施工和养护”等因素，在桥梁结构选择、耐久性、抗震设计等方面应加强安全设计。     

National road mortality reduction targets under European Union road safety policy: 2011–2020

The European Union (EU) has proposed renewing the target for halving the number of road fatalities in the period 2011–2020. In this paper, a nonlinear distribution method for dynamic fatality reduction targets is applied for the purpose of finding individual national mortality reduction targets for each of the 27 member countries in the EU. Weighting is undertaken for four scenarios based on the following indicators: road mortality rates, fatality rates, fatality risks, and fatality density. Results are presented for four proposals to reduce the number of fatalities in each Member State, based on the original situation of the indicators considered in the study. The results seek to provide policy-makers with a broader vision with regard to the achievement of the goals of EU road safety policy.     

Alternative fuels for transportation

The alternatives to the oil based fuels for transportation are considered and analysed. These are the synthetic fuels, made from coal, the liquid petroleum gases of propane and butane, compressed natural gas and methanol. The problems associated with the use of electric vehicles are discussed; the main problem being that of range.

The possible use of hydrogen as a fuel is analysed in some detail. Since its supply can be tied directly to nuclear energy sources, rather than hydrocarbon feed stocks, it could be an alternative in the long term. The main problems of the storage of hydrogen on the vehicle and of its propensity to “back‐fire” into the engine intake are discussed. The first can be ameliorated and the second eliminated by dual fuelling; with petrol. It is advocated that the on‐board storage of hydrogen be by the use of hydrides for private cars. However, it is expected that it may be as liquid hydrogen for some forms of transport and will certainly be in this form for aircraft.     

高速公路大修工程施工区安全与交通组织研究

进行大修的高速公路,大多是所在区域的运输干道和交通骨架,交通量往往很大,交通环境复杂,如果对交通组织研究得不够,会导致施工时交通组织混乱,严重影响施进度和施工区的安全,还会造成长时间交通拥堵等被动局面.对高速公路大修施工路段事故原因、交通组织方案和交通分流的分析,对于确保施工的顺利实施以及驾驶员和施工人员安全具有重要意义.     

隧道瓦斯防突技术探讨

随着国家高速公路的迅猛发展,公路隧道越来越多地应用于高速公路的建设当中。当隧道经过煤层或采空区时,隧道周边围岩就会有瓦斯存在。作为特殊地质地段隧道的一种,瓦斯隧道施工过程中,要特别注意隧道内瓦斯的浓度,否则,极有可能发生瓦斯爆炸,引起工程事故。结合松卜岭隧道的瓦斯防护技术设计,主要讨论隧道通过煤层时,隧道掘进施工过程中的瓦斯突出危险性预测及防突措施。     

公路路面施工安全管理分析

鉴于公路路面施工质量安全事故频发,施工单位应该在路面施工各阶段,采取正确的管理方式,做好安全管理工作,以保证公路质量。因此,通过对公路路面做好安全管理的必要性进行分析,提出一些加强公路路面施工的安全管理措施,为同行提供借鉴。     

Did California’s hand-held cell phone ban reduce accidents?

On July 1st, 2008, California enacted a ban on hand-held cell phone use while driving. Using California Highway Patrol panel accident data for California freeways from January 1st, 2008 to December 31st, 2008, we examine whether this policy reduced the number of accidents on California highways. To control for unobserved time-varying effects that could be correlated with the ban, we use high-frequency data and a regression discontinuity design. We find no evidence that the ban on hand-held cell phone use led to a reduction in traffic accidents.