单斗挖掘机在公路施工中的应用

针对单斗挖掘机在土石方施工中的特点,介绍了单斗挖掘机中正、反铲挖掘机的基本作业方法,施工作业方法,以及生产率提高的措施等,可供施工中参考.     

Productivity,efficiency and technical change in the European railways: A non-parametric approach

The purpose of this paper is to analyse the evolution of productivity in the European railways in the period 1970–95. We use a non-parametric approach that enables changes in productivity to be broken down into variations in efficiency and technical change. The results indicate that the productivity growth is concentrated in the last period (1985–95), when the majority of the companies undertook processes of reforms. This increase in productivity is mainly due to technical progress. We also analyse the determinants of efficiency and, unlike other papers, the technical change, finding that the greater the degree of autonomy and financial independence, the higher the efficiency levels and technical change. This revised version was published online in June 2006 with corrections to the Cover Date.     

沥青混合料中矿料粒径和拌和机筛网的选择

针对降低沥青混合料在拌和阶段成本的问题,简要介绍了沥青混合料中矿料粒径和拌和机筛网的选择以及拌和机筛网的孔径选择对拌和机生产效率的影响,并结合工程实例给以说明.     

西部高原地区沥青混凝土路面施工机群选型研究(3)

结合西部高原环境特点,分析了沥青混凝土路面机械化施工中,压实机械在高原环境下工作能力的折减规律,提出了不同海拔高度下,非增压压实机械及增压压实机械的工作能力折减系数.     

Increased productivity efforts yield few rewards in the knowledge economy

Population aging is reducing access to knowledge workers even as they are becoming more important to economic growth. Thus far, corporations and governments alike have made the intuitive yet untested assumption that working the existing workforce harder and longer can alleviate the economic fallout. This is based on the ‘success’ similar efforts have previously seen in production industries characterized by physical inputs. Our study provides evidence that these successes may not carry over to industries, such as transportation that are reliant on intellectual skill. It is shown that meeting productivity goals by increasing the job demands of knowledge workers, specifically air traffic controllers, compromises the provision of new kinds of value added. Furthermore, it is demonstrated for the first time that increasing job duration exacerbates the effects of job demand on human performance. Coping with staffing shortages by asking that knowledge workers simply ‘do more’ may impede rather than stimulate economic growth.     

When it comes to container port efficiency,are all developing regions equal?

In this paper we carry out a container port performance analysis of the developing world between 2000 and 2010, using both parametric and nonparametric approaches. From a unique dataset – our sample covers 70 developing countries, 203 ports, and 1750 data points–, we examine the evolution and drivers of productivity and efficiency changes across developing regions. We show that productivity growth rates between 2000 and 2010 vary significantly and that this heterogeneity is explained by pure efficiency changes rather than scale efficiency of technological changes. Therefore, we carry out a detailed efficiency analysis to determine the drivers of port efficiency. Time series results show an upward trend for port efficiency in developing regions, as it increased from 51 percent in 2000 to 61 percent in 2010. Our analysis indicates that private sector participation, the reduction of corruption in the public sector, improvements in liner connectivity and the existence of multimodal links increase the level of port efficiency in developing regions.     

连云港港混合土的特性指标与挖掘产量关系

绞吸船疏浚典型黏性土、密实粉土粉砂和钙质结核物的混合土时易糊绞刀头,且输送时易堵管。依托连云港港30万吨级航道疏浚工程,对混合土的不均匀性进行分析,从典型土的挖掘比能与船舶施工参数相关性角度,推导出连云港港混合土的特性指标与挖掘产量的计算公式,可预测复杂土的疏浚产量。结果表明:连云港港典型混合土由黏性土、密实粉土粉砂和钙质结核物混合而成,具有多种土质特性;利用推导出的公式预测"天虎号"绞吸船挖掘此类土的生产率,经过与实测值对比,其相对偏差在15%以下,可靠性好,可为类似工程提供借鉴。     

合力打造铁路给水排水行业快速发展的新局面

根据铁路跨越式发展对给水排水行业带来的新课题 ,提出了给水排水行业快速发展的总体思路和主要内涵 ,说明了行业加速实现装备现代化的建设要求 ,分析了生产布局调整的意义和前景。号召大家齐心协力 ,奋发进取     

MARINIMAP120拌和楼生产率因素分析

我国在用的沥青混凝土拌和楼中,意大利MARINI公司MAP120拌和楼的结构及工艺流程有其独到的特点。根据工程应用实际对影响拌和楼生产率的因素进行分析并提出处理方法,从而使该设备能充分发挥独特的工艺特性,有其非常现实的意义。     

一类汽车维修企业产能瓶颈的突破探析

由于对中国汽车市场估计不足,大多数一类汽车维修企业在发展过程中总是受到产能瓶颈的限制。首先通过人力资源结构调整、管理水准提升、技术水准提升等手段实现假象性产能的提升,然后再通过技术性、设备性等手段实现第二阶段的产能提升,可以彻底解决现有汽车维修企业的产能瓶颈问题。