项目集成控制中不确定参数挣值法研究

针对传统挣值方法没有考虑计划指标不确定性的问题,文章将挣值法与统计学的一般理论相结合,将不确定信息的处理方法引入挣值分析,提出不确定性参数挣值法。该方法通过分析工序作业成本一进度的统计规律性,建立项目成本一进度计划的控制区间,根据项目实际执行情况得到更客观的评价信息,在拓展了挣值分析的功能的同时,改善了计划实施的可靠度。     

后金融危机时代京津冀区域经济合作发展趋势与河北战略选择

本文首先介绍了京津冀地区区域经济合作的现状和存在的问题。通过分析金融危机后京津冀地区产业体系的变化,在此基础上探讨后金融危机时期京津冀区域经济合作发展的趋势。最后,有针对性地提出了河北省参与京津冀区域经济合作的战略对策。     

河北省县域农业旅游发展研究

农业旅游是县域经济的重要组成部分。河北省发展县域农业旅游取得了一定的成果,但也存在诸多问题。为了解决这些弊端,获得更大的经济效益,河北省各县域应充分利用现有农业资源,谨慎处理多种关系,采用适宜的开发模式,进行科学合理的规划。     

辽宁装备制造业竞争力实证研究与提升战略

文章根据波特的钻石模型及装备制造业竞争力的内涵,构建装备制造业的竞争力评价指标体系。运用2008—2009年经济数据,采用区位熵系数法、比较分析法对辽宁装备制造业竞争力进行实证研究,认为存在市场拓展能力和利润水平偏低、高端装备制造业发展滞后、核心企业不够强大、产业链短等问题。针对这些问题,辽宁装备制造业必须转变发展方式,提高企业国际竞争力,加快发展先进装备制造业,完善产业链,实施国际化和高端化发展战略。     

Older adult pedestrian injuries in the United States: causes and contributing circumstances

As the US population ages, more older adults will face transportation and mobility challenges. This study examines the characteristics and contributing circumstances of nonfatal older adult pedestrian injuries. Data were obtained from the National Electronic Injury Surveillance System-All Injury Programme (NEISS-AIP) for the years 2001 through 2006. Cases included persons aged 65 years and older who were nonfatally injured on a public roadway. The results indicated that on average, an estimated 52,482 older adults were treated in emergency departments each year for nonfatal pedestrian injuries. Falling and being hit by a motor vehicle were the leading mechanisms of injury, resulting in 77.5% and 15.0% of older adult pedestrian injuries, respectively. More than 9000 older pedestrian fall-related injuries each year involved a kerb. It is concluded that the growth in the older adult population could add to the overall burden of these nonfatal pedestrian injuries. Making transportation and mobility improvements, including environmental modifications, is important for preventing these injuries.     

Off‐farm work,technical efficiency,and rice production risk in Taiwan

This article investigates the differences in yield production, production efficiency, and yield risk for farmers both with and without off‐farm work. Using a nationwide survey of rice farmers in Taiwan, we estimate two stochastic production frontier models that accommodate technical inefficiency and production risk simultaneously for farmers both with and without off‐farm work. The stochastic dominance criterion is then applied to compare the differences in the distributions of the estimated technical efficiency and yield risk between groups. The empirical results indicate that these two groups of farmers use resources in different ways, and off‐farm work is not necessarily associated with lower technical efficiency. For farmers in the lower percentiles of the efficiency distribution, those with off‐farm work are more efficient than their counterparts without off‐farm work. In addition, farmers with off‐farm work face higher production risk and this result is robust for the entire distribution.     

聚合氯化铝在污水处理中的应用

聚合氯化铝（PAC）由于具有投加量少、絮体大、絮体沉降速度快、成本低、混凝效果好等优点．目前在国内外广泛应用于水和污水处理上。对PAC在污水处理中的应用情况进行了综合论述,并展望了PAC研究前景。PAC在污水处理中的应用方式主要有：PAC直接处理污水、PAC与其他工艺组合处理污水、PAC与其他药剂复配处理污水、改性PAC处理污水。     

调整政府支出结构促进居民消费增长——基于政府支出与居民消费互补性关系的分析

本文主要从政府支出与居民消费的互补性关系出发,提出政府支出结构调整的三个主要方面,即加大农村基础设施的投资、加大教育和健康服务等优效品的支付以及加大社会保障和收入支持的支出,以此促进居民消费快速增长,推动经济增长由主要依靠投资和出口拉动向主要依靠内需特别是消费拉动转变。     

集体林区生态公益林建设对劳动力转移的影响——以浙江省为例

生态公益林作为我国政府强化生态文明建设的重要举措,在保障生态安全方面发挥着重要作用.本文使用浙江省的农户调查数据,使用Heckit模型实证检验了农户生态公益林面积和生态公益林损失性补偿对农户家庭劳动力转移的影响.结果表明:尽管生态公益林面积的增加促进了农户劳动力转移,但是生态公益林补贴与劳动力转移呈现出倒U形关系,即随...     

体制创新的共建与共享

一、体制创新:共建什么,共享什么 (一)什么是共建 目前,社会上讲的"共建"主要集中在共建和谐社会.这固然是"共建"的一个重要方面,而且从社会体制改革角度来说,这个提法也是正确的.但是,从更广阔的整个体制转型来说,这又是不够的,应进一步地拓展,即拓展到四个方面,树立"四位一体"的广义"共建观".