机动车辆智能收费系统的研究

本文介绍了利用射频询问器及安装在车辆上的有源射频ＩＣ卡（应答器）组成的远距离，不接触的无线识别系统，以及利用该系统向射频ＩＣ卡写入与读出的必要的数据；对距离很近的运动和静止的目标进行识别，实现不停车的机动车辆智能收费系统的原理和方法。     

乘用车车内结构噪声测量分析

针对车内噪声对乘用车舒适性的不良影响，透析了乘用车结构声源产生的原因与机理，重点分析了其声场分布特性，为控制噪声提出了对策，并为乘用车在降噪及相关领域内，确立了一个大致的研究方向。     

钢管混凝土拱桥超声波检测研究

本文主要介绍了钢管混凝土超声检测原理和钢管混凝土缺陷识别方法，并结合万县长江公路大桥应用超声检测钢管混凝土的缺陷实例进行了分析。     

Mean-Variance Hedging for General Claims in an Incomplete Market： Numeraire Method

This paper considered the problem of hedging a European call (put) option for a diffusion model where the asset price is influenced by n uncertain factors. The market is thus incomplete implying that perfect hedging is not possible. To derive a hedging strategy, it follows the approach based on the idea of hedging under a mean-vari-ance criterion suggested by Schweizer. A very simple solution of this hedging problem by using the numeraire method was presented and some examples with explicit solutions were given.     

企业运输计划研究

考虑企业仓储量有限，生产需求一定，而运输时间不确定的特点，本文建立了一个库存优化模型，并给出了解法，应用此模型，可优化制定企业原料运输计划，节省费用，文中所提供的一个工厂实例运算结果表明此模型具有一定的实用价值。     

雁门关隧道超前地质预报与监控量测技术

主要介绍雁门关隧道的超前地质预报与监控量测工作，通过超前地质预报为隧道工程的快速掘进、支护材料的提前准备以及灾害事故的有效预防提供可靠的地质资料与信息。通过监控量测技术为进一步修正设计提供信息，使得隧道围岩类别与支护结构相匹配，确保隧道工程安全、高质、经济与高效施工。     

轨道交通在城市中的应用展望

主要介绍轨道交通的种类、服务性能、特点,以及在城市中的应用,发展前景.     

图形几何变换在起重机械CAD中的应用

文章介绍发在起重机械ＣＡＤ的参数绘图中利用图形的几何变换进行编程，使减箱的装配图绘图编程工作量较变换前减少５０％，极大地提高了机械ＣＡＤ二次开发的速度。     

Effect of temperature, chloride ions and sulfide ions on the electrochemical properties of 316L stainless steel in simulated cooling water

The influence of temperature, chloride ions and sulfide ions on the anticorrosion behavior of 316L stainless steel in simulated cooling water was studied by electrochemical impedance spectroscopy and anodic polarization curves. The results show that the film resistance increases with the solution temperature but decreases after 8 days＇ immersion, which indicates that the film formed at higher temperature has inferior anticorrosion behavior; Chloride ions and sulfide ions have remarkable effects on the electrochemical property of 316L stainless steel in simulated cooling water and the pitting potential declines with the concentration of chloride ions; the passivation current has no obvious effect; the rise of the concentration of sulfide ions obviously increases the passivation current, but the pitting potential changes little, which indicates that the two types of ions may have different effects on destructing passive film of stainless steel. The critical concentration of chloride ions causing anodic potential curve＇s change in simulated cooling water is 250 mg/L for 316 L stainless. The effect of sulfide ions on the corrosion resistance behavior of stainless steel is increasing the passivation current density Ip. The addition of 6 mg/L sulfide ions to the solution makes Ip of 316 L increase by 0.5 times.     

城市轨道交通施工安全风险监控系统升级设计与功能创新

依据北京轨道交通安全风险技术管理体系,总结其风险监控系统多年运行的经验,根据新形势下安全风险管控的实际需要,结合移动互联网、大数据、GIS等新技术,对风险监控系统进行升级设计,优化监控信息即时采集、标准化数据存储与统计、风险动态分析管控、自动化履约考核等监控系统功能,实现对安全风险信息采集、信息分析、预警发布、成果报送...