沥青混合料空隙率的研究

主要研究了沥青混合料空隙率试验中的有关问题 ,包括实测密度的测量、理论密度的计算以及空隙率计算等 .通过大量的室内试验得出了一些有益的结论 ,譬如理论密度计算的问题 ,和几种实测密度之间的关系等 ,为进一步标准沥青混合料空隙率的计算方法奠定基础     

论我国个人所得税的税制改革

阐述了我国个人所得税税制的特征,对个人所得税税制存在的缺陷做了分析,对个税改革的条件、原则和具体措施提出了自己的观点。     

车架纵梁材料利用率分析

在重型汽车中被称为汽车"脊梁"的车架总成,其最重要的零件纵梁被誉为车架总成的"脊梁",而纵梁加工过程中一个重要工艺指标是材料利用率,文章主要对车架加工工艺进行分析,找到纵梁材料损失的主要工序,分析原材料对纵梁下料过程的影响,通过采取措施减少材料损耗,降低生产成本.通过分析材料利用率,能够帮助企业在生产制作中,找到提升的...     

车用乙醇汽油金属腐蚀抑制剂的研究

针对乙醇汽油对金属腐蚀性加剧的问题,研究了新的金属腐蚀抑制剂,其作用机理是各种成分协同作用,在金属的表面形成有效的保护膜,抑制由于水的存在导致的酸腐蚀和电化学腐蚀。在金属腐蚀抑制剂加量200 m g/L时,对黄铜缓蚀率为93.7%;对紫铜缓蚀率为91.9%;对铝缓蚀率为90.0%;对20钢缓蚀率为78.5%;且性能优于美国专利配方。     

铁路浸水支挡结构的最不利水位与确定方法

本文从铁路行业最不利水位的概念和主要作用入手,分析了规范中最不利水位定义的局限性,提出了完善最不利水位定义的建议,构建了以最小偏移率确定浸水支挡结构控制项和最不利水位的通用方法.结合具体的工程实例,演示了确定最不利水位的步骤和过程.     

沉降速率法在软基沉降分析中的应用

文章结合国内沿海某机场飞行区扩建项目软基处理工程实例,对比分析了双曲线法、三点法、Asaoka法和沉降速率法的主固结沉降量推算结果,指出了沉降速率法的优势,并应用沉降速率法准确的进行了沉降预测和卸载时间预测。     

Mobility and environment improvement of signalized networks through Vehicle-to-Infrastructure (V2I) communications

Traffic signals, even though crucial for safe operations of busy intersections, are one of the leading causes of travel delays in urban settings, as well as the reason why billions of gallons of fuel are burned, and tons of toxic pollutants released to the atmosphere each year by idling engines. Recent advances in cellular networks and dedicated short-range communications make Vehicle-to-Infrastructure (V2I) communications a reality, as individual cars and traffic signals can now be equipped with communication and computing devices. In this paper, we first presented an integrated simulator with V2I, a car-following model and an emission model to simulate the behavior of vehicles at signalized intersections and calculate travel delays in queues, vehicle emissions, and fuel consumption. We then present a hierarchical green driving strategy based on feedback control to smooth stop-and-go traffic in signalized networks, where signals can disseminate traffic signal information and loop detector data to connected vehicles through V2I communications. In this strategy, the control variable is an individual advisory speed limit for each equipped vehicle, which is calculated from its location, signal settings, and traffic conditions. Finally, we quantify the mobility and environment improvements of the green driving strategy with respect to market penetration rates of equipped vehicles, traffic conditions, communication characteristics, location accuracy, and the car-following model itself, both in isolated and non-isolated intersections. In particular, we demonstrate savings of around 15% in travel delays and around 8% in fuel consumption and greenhouse gas emissions. Different from many existing ecodriving strategies in signalized road networks, where vehicles’ speed profiles are totally controlled, our strategy is hierarchical, since only the speed limit is provided, and vehicles still have to follow their leaders. Such a strategy is crucial for maintaining safety with mixed vehicles.     

How to best address aviation’s full climate impact from an economic policy point of view? – Main results from AviClim research project

The interdisciplinary research project AviClim (Including Aviation in International Protocols for Climate Protection) has explored the feasibility for including aviation’s full climate impact, i.e., both long-lived CO₂ and short-lived non-CO₂ effects, in international protocols for climate protection and has investigated the economic impacts. Short-lived non-CO₂ effects of aviation are NO_x emissions, H₂O emissions or contrail cirrus, for instance.Four geopolitical scenarios have been designed which differ concerning the level of international support for climate protecting measures. These scenarios have been combined alternatively with an emissions trading scheme on CO₂ and non-CO₂ species, a climate tax and a NO_x emission charge combined with CO₂ trading and operational measures (such as lower flight altitudes). Modelling results indicate that a global emissions trading scheme for both CO₂ and non-CO₂ emissions would be the best solution from an economic and environmental point of view. Costs and impacts on competition could be kept at a relatively moderate level and effects on employment are moderate, too. At the same time, environmental benefits are noticeable.     

基于业务的SNCP在寿平铁路的应用

通信系统的建设遵循技术成熟、经济适用、同时满足发展需要的原则,网络结构满足运营维护管理体制的要求,传输系统必须具备较高的网络保护和恢复能力。基于寿平铁路通信传输系统组网及益羊线既有运营维护管理体制,本次工程通信传输系统组网旨在保证业务的高度可靠。通过参照子网连接保护(SNCP)已广泛用于传输系统的组网案例,其适用于各种网络拓扑结构,倒换速度快,可实时切换工作通道和保护通道。为此,选用基于业务的SNCP作为本线传输系统的网络保护方式,以双发选收的原则保证通信传输业务的高度可靠,并在优化网络结构的同时,一定程度上提高益羊线传输系统的通道利用率。     

非恒定流作用下输沙率变化过程研究*

通航河流修建水利枢纽后,调峰发电下泄类似“人造洪峰”的非恒定流和含沙量趋近于零的清水,破坏了河流的平衡,给河床演变、航道整治技术等带来新的课题。通过水槽试验、理论分析等手段,研究枢纽下游非恒定流作用下均匀沙的起动与输移规律。研究认为：非恒定流作用下输沙率变化过程与水流条件具有不同步性,并与水流非恒定强度P有关,当P＞032时,水流参数峰值一般先于输沙率峰值;当P＜032时,水流参数峰值滞后于输沙率峰值。