响水涧抽水蓄能电站下水库工程临时交通桥设计

响水涧抽水蓄能电站下水库跨泊口河交通桥属临时交通工程。整座桥坐落于Q3软质土基上,基础采用混凝土刚性基础,结构为重力式桥墩结合箱型钢梁。该桥结构简单,施工难度小,施工周期短,整桥的稳定性满足下水库高强度、大方量的土方运输要求。     

确保BZS空腹复合楼板施工质量探析

通过对空腹复合无梁楼盖新技术的应用,在工程实例中采用PDCA循环质量管理,找出影响空腹复合楼板质量的主要问题,并展开原因分析,确定改进对策后实施,总结了空腹复合楼板的施工技术及施工经验。     

Factors contributing to injury severity in work zone related crashes in New Zealand

Roadworks take place frequently on existing roads in New Zealand. The adverse effects of poor road conditions and reduced road width due to the presence of a work zone on the safety of road users and workers at the work zone have been a matter of concern. Several studies have been conducted to examine the risk factors contributing to the occurrence of road crashes in work zones in different countries. Slow-moving and stopped vehicles near work zones have been found to be the primary cause of crashes and casualties in the work zones. Excessive speed of passing traffic has also been recognized as a crucial factor contributing to work zone related crashes in New Zealand. This study examined the effect of possible risk factors contributing to severe injury and fatality in work zone related crashes in New Zealand. A multinomial logistic regression model was established to determine the association between crash severity and factors such as road environment, vehicle attributes, driver behavior, and crash circumstances, based on the information available on 453 road crashes during the period from 2008 to 2013. The results indicated that the time period, vehicle involvement, and presence of vulnerable road users were the factors that determined the crash severity in work zones. This implies that improvements are required in traffic control and management measures in work zones to enhance road safety in the long run.     

Stock market crash of 2008: an empirical study of the deviation of share prices from company fundamentals

The aim of this study is to investigate quantitatively whether share prices deviated from company fundamentals in the stock market crash of 2008. For this purpose, we use a large database containing the balance sheets and share prices of 7796 worldwide companies for the period 2004–2013. We develop a panel regression model using three financial indicators – dividends per share, cash flow per share and book value per share – as explanatory variables for share price. We then estimate individual company fundamentals for each year by removing the time fixed effects from the two-way fixed effects model, which we identified as the best of the panel regression models.

Based on these results, we analyse the market anomaly quantitatively using the divergence rate – the rate of the deviation of share price from a company’s fundamentals. We find that share prices on average were overvalued in the period from 2005 to 2007 and were undervalued significantly in 2008, when the global financial crisis occurred. Share prices were equivalent to the fundamentals on average in the subsequent period. Our empirical results clearly demonstrate that the worldwide stock market fluctuated excessively in the time period before and just after the global financial crisis of 2008.     

A top box analysis of DinEX to optimize restaurant resources

This study examined the relative perceived importance of the various dimensions of the restaurant experience, as captured by DinEX. Over 1,000 U.S. restaurant patrons provided perceived importance ratings of six DinEX dimensions as they related to their most recent dining experience across a variety of meal periods and restaurant categories. To make comparisons, an innovative approach to analyzing top box data was utilized. The results indicate significant differences exist across each of the DinEX dimensions, with food quality emerging as the top concern of restaurant patrons. The results of the study offer valuable guidance to the restaurateur in terms of the distinct ordering of experience dimensions that were observed, as well as the straightforward methodology demonstrated for monitoring and evaluating customers’ importance perceptions.     

椭圆曲线密码体制的应用及研究

介绍了椭圆曲线密码体制的基本应用,分析了ECC优于其他公钥系统的具体优点及其数学原理。针对椭圆曲线的研究热点,归纳出椭圆曲线选取原则以及椭圆曲线快速算法的基本原理。深入研究了椭圆曲线上双线性映射,构建了其在电子商务中应用模型,证明了该性质对ECC进一步发展的促进作用。     

Fatality rate of pedestrians and fatal crash involvement rate of drivers in pedestrian crashes: a case study of Iran

The aim of this study was to uncover patterns of pedestrian crashes. In the first stage, 34,178 pedestrian-involved crashes occurred in Iran during a four-year period were grouped into homogeneous clusters using a clustering analysis. Next, some in-cluster and inter-cluster crash patterns were analysed. The clustering analysis yielded six pedestrian crash groups. Car/van/pickup crashes on rural roads as well as heavy vehicle crashes were found to be less frequent but more likely to be fatal compared to other crash clusters. In addition, after controlling for crash frequency in each cluster, it was found that the fatality rate of each pedestrian age group as well as the fatal crash involvement rate of each driver age group varies across the six clusters. Results of present study has some policy implications including, promoting pedestrian safety training sessions for heavy vehicle drivers, imposing limitations over elderly heavy vehicle drivers, reinforcing penalties toward under 19 drivers and motorcyclists. In addition, road safety campaigns in rural areas may be promoted to inform people about the higher fatality rate of pedestrians on rural roads. The crash patterns uncovered in this study might also be useful for prioritizing future pedestrian safety research areas.     

嘉绍大桥钢锚箱制作质量控制方法研究

根据嘉绍大桥钢锚箱的结构特点着重介绍嘉绍大桥钢锚箱制作难点及质量控制方法,并具体阐述了通过运用强化过程控制和三检制相结合的精细化质量控制法及各项措施的实施,有效的控制了嘉绍大桥钢锚箱的产品质量,一次报验合格率100%,桥址架设顺利。     

数字电视机顶盒的基本原理、技术及构成探讨

探讨了数字电视机顶盒的基本工作原理,分析其技术原理,并探讨了数字电视机顶盒的中间件结构。     

分形理论及其在资本市场研究中的意义

资本市场不是一个简单的线性系统 ,而是一个极其复杂的非线性系统。正因为如此 ,用分形理论来解释并预测各种复杂的经济现象便具有十分重要的现实意义。本文详细介绍了分形理论的基本概念 ,介绍了Hausdorff维数、拓扑维数和盒维数的定义 ,最后探讨了分形理论在资本市场研究中的意义。