非食用生物质制燃料乙醇的研究现状

生物质能源是清洁的可再生的能源,目前以非食用生物质为原料来制取可再生的新能源——燃料乙醇受到了越来越多研究者的关注。重点介绍了从纤维素类生物质制备燃料乙醇的发展现状及关键工艺,指出了其广阔的发展前景。     

飞机燃油系统高空性及其计算

在研究论述飞机燃油系统设计中高空性的基础上,通过分析燃油的饱和蒸汽压的影响因素,给出了燃油饱和蒸汽压的计算公式和燃油的饱和蒸汽压力随温度的变化曲线,并给出了航空煤油能够保证的飞行高度;讨论了燃油系统的汽蚀问题;分带供油泵管路和无供油泵管路2种情况讨论了燃油系统高空性计算流程,并给出了具体的计算公式和图表。     

基于全生命周期评价的燃料乙醇能值分析——以木薯为例

在生命周期理论框架下,引入能值分析方法,对燃料乙醇系统的3个阶段进行了能耗分析;把燃料乙醇生命周期过程中社会、经济、自然3个系统有机统一起来,定量分析自然和人类社会经济的真实价值;以木薯燃料乙醇为例,结果表明,木薯燃料乙醇生命周期能值转换率为1.10E＋06seJ/J、生命周期能值产出率为1.03,生命周期能值环境负载率为40.9,生命周期能值投资率为32.6,生命周期能值可持续值为0.025。     

Technological variation and the US renewable fuel standard

The US Renewable Fuel Standard contains a policy bias that undermines the three-broad policy goals of rural development, energy security, and greenhouse gas reductions. This policy bias, wherein a narrow range of options is expected to address broad societal objectives, contributes to a persistence of first-generation biofuels and limits technical variation. Renewable fuel content requirements have helped to expand the use of ethanol and biodiesel in the short term. However, long-term changes will require greater technological variation to stimulate innovation for the development of sustainable renewable fuel pathways.     

论生产者延伸责任制度

生产者延伸责任是产品生产者对产品废弃后的废物承担回收处置的责任,责任主体包括产品生产者、进口者和销售者,责任形式有行为责任、经济责任和信息责任。我国应遵循必要性、可行性和公平性原则,通过制定《中华人民共和国固体废物污染环境防治法》的实施细则,选择适当领域,逐步引入生产者延伸责任。     

基于结构方程模型的水利工程社会影响路径

以水利工程产生的社会影响为研究对象,在确定水利工程社会影响变量的基础上构建水利工程社会影响的结构方程模型,比较水利工程的社会影响路径。以富江小水电代燃料工程为例进行实证,结果表明:富江小水电代燃料工程对家庭结构、人文景观以及个人收入产生的影响较大,在水利工程项目评价中应特别注重这些方面的影响。     

焦化酸焦油的处置利用

介绍了酸焦油的性质及危害,综述了酸焦油生产燃料油、橡胶添加剂、配煤炼焦、表面活性剂等处置利用方式。     

基于Solid Works的双顶置凸轮轴的设计与建模研究

本文以Solid Works为平台,利用其强大的参数化造型技术和Solid Works提供的二次开发模块,建立汽车的双顶置凸轮轴参数化设计与三维实体建模,以适应机车新产品的设计和开发,与CAD软件建库方案相比较,Solid Works具有基于特征,全尺寸的约束,尺寸驱动设计修改,全数据相关等特点,适合标准件的建模,提高了设计效率。     

加强火电企业燃料成本控制的路径分析

火电企业作为市场经济的一个主体,也要追求经济效益,而其重点便在于对燃料成本的控制。本文以燃煤为例,对火电企业燃料成本的影响因素进行了分析,并从这些因素出发,提出一系列成本控制的对策。     

A fuzzy assessment method to airport waste management: A case study of Congonhas Airport,Brazil

This study presents a fuzzy mathematical model to support and evaluate airport waste management. The model generates a waste management index, composed of three dimensions, and it was applied in a case study of Congonhas Airport, located in Brazil. In addition to the mathematical model, the nonparametric Mann-Kendall test was applied to verify the existence of bias in the obtained results. The results showed that there is a concern on the part of the airport regarding waste management, reflected in the Fuzzy Waste Management Index (FWMI) results. They also indicated that there was an improvement in waste management in 2015 compared to 2014, resulting from increased accounting for recyclables and awareness of the airport community. The developed model proved to be an important tool to support the decision making of airport managers, including aspects related to waste management steps, and there may be adjustments that may be made to include new indicators.