电子产品的可靠性分析和评估

针对目前可靠性数据统计中遇到的一些问题,阐述了可靠性数据统计和评估的基本对象,怎样得到一个子系统的可靠性要求以及该要求在子系统内部各部件中的分配,新产品取代老产品的必要条件以及冗余系统的可靠性统计和评估方法.其目的在于促进新产品的可靠性设计和现有产品的可靠性数据统计.     

华北地区钢铁工业发展与铁矿石供需分析

随着我国基础设施建设、房地产业和机械制造业的发展,钢铁产量处于加快增长的态势。华北地区是我国钢铁工业发展最快、钢铁企业最为密集的地区,进口矿石需求量逐年增加。由于国家环境保护及资源保护相关政策的要求,加上国内矿石开采成本高、品位低等原因,未来华北地区钢铁企业矿石需求中进口矿石所占比例还将有所提高。     

船体结构屈曲强度评估方法的规范研究及应用

论述了船舶结构规范中应用的结构屈曲强度评估方法的规范,如二维屈曲规范指定性要求,三维有限元模型中高级屈曲方法及其技术发展等。对其中的高级屈曲方法中的两种不同方法论的技术背景,包括理论基础和实际应用情况做了阐述,并对其中的非线性有限元加筋板格极限强度分析工作做了阐述,及时掌握目前国际领域新技术新标准发展信息。     

改性沥青的应用

从分析改性沥青的种类、技术要求入手,对改性沥青的路面施工工艺进行了分析,具有很高的使用价值。     

QFD方法在桥梁工程中的应用

质量功能展开(QFD)方法是一种顾客驱动的方法,可以把顾客的需求引入设计过程,有效地改善设计过程。通过对QFD方法进行分析,认为QFD方法可用于桥梁规划、设计、生产和施工等的分析决策,并研究了该方法在桥梁工程中应用的基本目标和应用步骤。最后通过实例分析证明了该方法很方便地将业主和使用者的需求转变成桥梁方案的功能要求和主要技术指标,确定桥梁设计中的关键技术指标,从而改进桥梁设计的质量,更好地满足业主和使用者的需求。     

Electric vehicles: How much range is required for a day’s driving?

One full year of high-resolution driving data from 484 instrumented gasoline vehicles in the US is used to analyze daily driving patterns, and from those infer the range requirements of electric vehicles (EVs). We conservatively assume that EV drivers would not change their current gasoline-fueled driving patterns and that they would charge only once daily, typically at home overnight. Next, the market is segmented into those drivers for whom a limited-range vehicle would meet every day’s range need, and those who could meet their daily range need only if they make adaptations on some days. Adaptations, for example, could mean they have to either recharge during the day, borrow a liquid-fueled vehicle, or save some errands for the subsequent day. From this analysis, with the stated assumptions, we infer the potential market share for limited-range vehicles. For example, we find that 9% of the vehicles in the sample never exceeded 100 miles in one day, and 21% never exceeded 150 miles in one day. These drivers presumably could substitute a limited-range vehicle, like electric vehicles now on the market, for their current gasoline vehicle without any adaptation in their driving at all. For drivers who are willing to make adaptations on 2 days a year, the same 100 mile range EV would meet the needs of 17% of drivers, and if they are willing to adapt every other month (six times a year), it would work for 32% of drivers. Thus, it appears that even modest electric vehicles with today’s limited battery range, if marketed correctly to segments with appropriate driving behavior, comprise a large enough market for substantial vehicle sales. An additional analysis examines driving versus parking by time of day. On the average weekday at 5 pm, only 15% of the vehicles in the sample are on the road; at no time during the year are fewer than 75% of vehicles parked. Also, because the return trip home is widely spread in time, even if all cars plug in and begin charging immediately when they arrive home and park, the increased demand on the electric system is less problematic than prior analyses have suggested.     

关于新时代我国综合交通运输发展的若干思考

为进一步明确交通强国背景下我国综合交通运输发展战略,从理论和实践两个层面论证交通强国与综合交通运输的辩证关系,在此基础上分析了供给侧结构性改革、国家战略支撑、区域协调发展、科技创新、扩大对外开放、治理体系和治理能力现代化等对综合交通运输发展的新要求。以习近平关于综合交通运输的重要论述为根本遵循,研究提出新时代我国综合交通运输发展安全、便捷、高效、绿色、经济的价值导向、总体思路,探讨基础设施、运输服务、科技创新、治理体系四个方面的战略重点,为交通强国背景下我国综合交通运输发展构建了总体战略框架。     

道路运输安全技术应用现状与标准需求研究

道路运输安全技术的应用特别是相关技术标准的制定是确保道路运输安全的重要环节。伴随着我国交通标准化建设的快速发展．道路运输安全技术的标准化工作也将大踏步的向前迈进。     

浅谈建立二板市场

主要阐述了建立二板市场的意义及有关要求。     

印度港口的发展规划

从政策方面介绍了印度国家港口发展规划和4个主要港口的开发计划,并从具体数据预测了印度港口的运输需求,提出了适合需求的吞吐能力、必要投资和资金计划。