轿车冷起动/暖机工况排放优化

根据欧3/欧4排放法规的要求,对捷达/宝来轿车装备的1.6L2VRSH型发动机冷起动/暖机工况排放进行了优化。通过采取合理选择催化转换器、空燃比标定优化、调整点火提前角、加装二次空气系统等措施,可使1.6L2VRSH型发动机分别满足欧3、欧4排放标准。     

基于MSWBS的造船项目层次网络计划研究

为解决造船项目层次计划缺乏对应关系的问题,提出了基于现代船舶工程分解结构(MSWBS)的造船项目层次网络计划模型.通过分析MSWBS的特点,探讨MSWBS的分解原则、方法,在考虑MSWBS结构与网络图工序对应关系的基础上,提出了将MSWBS结构与任务依赖关系统一描述的造船项目层次网络计划模型.最后给出了一应用实例,说明该模型的可行性和实用性.     

甘肃农村劳动力转移过程中应关注的几个问题

甘肃省是经济欠发达的西部省区,省委、省政府很早就从经济社会发展和促进城乡就业的高度认识到了劳务输出工作的重要性,并采取相关措施促进农村劳动力转移,且在一定程度上取得了显著成效。然而,在取得成绩的同时一些问题也逐渐暴露出来,对此,我们必须予以高度关注。     

The impacts of built environment on home-based work and non-work trips: An empirical study from Iran

This paper aims to explore the impact of built environment attributes in the scale of one quarter-mile buffers on individuals’ travel behaviors in the metropolitan of Shiraz, Iran. In order to develop this topic, the present research is developed through the analysis of a dataset collected from residents of 22 neighborhoods with variety of land use features. Using household survey on daily activities, this study investigates home-based work and non-work (HBW and HBN) trips. Structural equation models are utilized to examine the relationships between land use attributes and travel behavior while taking into account socio-economic characteristics as the residential self-selection. Results from models indicate that individuals residing in areas with high residential and job density, and shorter distance to sub-centers are more interested in using transit and non-motorized modes. Moreover, residents of neighborhoods with mixed land uses tend to travel less by car and more by transit and non-motorized modes to non-work destinations. Nevertheless, the influences of design measurements such as street density and internal connectivity are mixed in our models. Although higher internal connectivity leads to more transit and non-motorized trips in HBW model, the impacts of design measurements on individuals travel behavior in HBN model are significantly in contrast with research hypothesis. Our study also shows the importance of individuals’ self-selection impacts on travel behaviors; individuals with special socio-demographic attributes live in the neighborhoods with regard to their transportation patterns. The findings of this paper reveal that the effects of built environment attributes on travel behavior in origins of trips do not exactly correspond with the expected predictions, when it comes in practice in a various study context. This study displays the necessity of regarding local conditions of urban areas and the inherent differences between travel destinations in integrating land use and transportation planning.     

铁路危险品装卸作业对工人健康影响研究

对铁路危险品装卸业场所空气毒物进行了测定，并对作业工人进行了体检。结果表明，危险品用优质包装较之普通包装空气毒物浓度下降３－９倍，机械装卸较之手工装卸空气毒物浓度下降２倍多。危险品装卸工与对照组相比，血清ＰＡ含量明显下降，外周血淋巴细胞微核显著增高。神经传导速度表现为正中神经ＭＣＶ、近端ＳＣＶ，尺神经近端ＳＣＶ明显降低。     

地铁维护工作安全风险研究现状及发展

通过论述国内外安全维护工作的现状,分析在地铁安全维护方面的研究薄弱点,将研究视角引入到地铁维护工作的安全风险上,探讨、梳理地铁维护工作的安全危险源及影响因素,以期对我国地铁维护工作提供新的研究思路。     

城市轨道交通票务收益安全管理体系研究

票务收入是轨道交通运营的经济命脉,票务 管理又是轨道交通运营管理的主要部分,收益安全保障体系的建立是衡量企业经营管理水平、促进企业管理的重要手段.探讨城市轨道交通运营管理的票务收益风险问题,以及如何建立收益安全管理体系.分析收益安全体系的组成,详细说明其所需硬件保障设备,阐述收益风险的评估、管理和意识3个概念.     

城市轨道交通运营企业的票务组织管理

论述票务组织管理在城市轨道交通运营企业中的核心作用,说明票务收入是轨道交通运营的经济命脉,票务管理又是轨道交通运营管理最主要的部分,票务组织管理水平的高低是衡量企业经营管理水平的重要标志。从国内城市轨道交通票务组织管理的现状入手,确立票务组织管理的核心位置,阐述票务政策的详细内容,对AFC系统进行介绍。     

空压机装配生产线平衡的研究和改善

从生产线平衡理论出发,以某空压机装配线为研究对象,运用作业测定技术中的时间研究方法,测定了流水线各工位作业时间,找出影响流水线生产能力的瓶颈工位,运用"5W1H"提问技术分析流水线存在的问题,根据ECRS(取消、合并、重排、简化)原则及流水线平整理论设计了流水线平整方案,新方案的实施使生产线平衡率和生产能力得到较大提高。     

双层地铁车辆基地内调车延续进路设计方案

针对双层地铁车辆基地(车辆场/段)存在调车作业进路坡度较大的问题,提出借鉴国铁"6‰接车进路设置延续进路"的理念,对调车进路进行防护,以防止车辆冒进信号。结合大连地铁2号线张前路双层地铁车辆段实例,通过合理的信号设备布置,解决调车作业进路坡度较大带来的安全隐患问题,并满足运营中对出段能力的要求。