浅谈如何打造学习型公路行业

在新的历史时期,建立学习型公路行业尤为重要.要树立三种学习观,通过建章立制,创新形式等措施,来打造学习型公路行业.     

微表处技术在城市道路应用中的施工控制

微表处以其优良的使用性能和显著的社会经济效益在公路预防性养护中得到广泛应用。文章介绍了微表处技术在市政道路应用过程中的一些问题及处理办法。     

浅谈影响公路工程质量的因素以及应对策略

工程建设是一个系统,影响工程质量的因素很多,上级政策、技术规范、决策思想、施工工艺、管理水平、工作质量及设计、施工、监理、业主、监督各单位的建设行为等因素都与工程质量密切相关。本文就几个主要原因进行分析,给出一些在公路路基建设阶段应该加强质量的措施。     

浅谈山区高等级公路的边坡防护设计

我国高等级公路边坡防护的研究起步较晚,至今仍处于不断完善和改进当中。本文简要介绍了高等级公路边坡防护设计工作在我国的发展状况以及边坡破坏的主要形式和原因,并对设计工作中应注意的问题以及具体措施进行了探讨。     

Trees,agroforestry and multifunctional agriculture in Cameroon

Modern agriculture has deprived local communities in the tropics of their natural life-support system—the forest resource and the traditional knowledge about indigenous species—and this has not been replaced by employment opportunities or social services. This project in the west and northwest regions of Cameroon takes an innovative three-step approach to improving the lives of local people by establishing rural resource centres (RRCs) to: (i) Rehabilitate degraded land and promote food security through the use of nitrogen-fixing trees to restore crop yields and then the diversification of the farming system with new crops; (ii) Create income generation opportunities from village tree nurseries and the domestication of indigenous fruits and nuts for local and regional trade. Income is rising annually and currently averages $150, $16,000 and $21,000 per RRC after 2, 5 and 10 years, respectively; (iii) Encourage the processing and marketing of food crops and tree products in order to create employment and entrepreneurial opportunities for community members. Income is currently $2400 per enterprise. The project's philosophy is one of helping smallholder farming communities to help themselves: first to become self-sufficient and economically independent, and then to be a hub for the dissemination of knowledge and skills to neighbouring communities.     

市政道路施工安全管理的有效措施分析

市政道路施工安全管理成为市政工程中最关键的环节。然而,影响施工安全管理工作的因素有很多,同时,这些因素都是非常复杂的,且处于不断的变化中。本文主要对当前我国市政道路施工安全管理的基本现状进行了深入的探讨和分析,并且提出了一些提高市政道路施工安全管理质量的措施,希望对今后的市政道路施工安全管理工作产生一些积极影响。     

城市道路拥挤额外时耗成本的实证研究——以上海市中心城为例

近年来,日益拥挤的城市道路对人们的出行效率产生了严重的影响.文本以上海为例,根据上海市的交通拥挤状况与市民的出行情况,采用“机会成本法”,结合最新可得数据,对上海市外环线以内中心城区的道路拥挤相关成本进行实证研究与测算,结论为:2009年,上海市中心城道路拥挤所导致额外耗时的经济成本为115.65亿元/年.     

MULTIDIMENSIONAL DISTANCE‐TO‐COLLAPSE POINT AND SOVEREIGN DEFAULT PREDICTION

By focusing on sovereign defaults, this paper introduces a multidimensional distance‐to‐collapse point based on a two‐step procedure. The first step is nonparametric and provides an early warning system that signals a potential crisis whenever preselected leading indicators exceed specific thresholds. The second is parametric and incorporates the first‐step country default predictors within a probit specification. Such a two‐step procedure generalizes the distance‐to‐default à la Merton within a multidimensional setting, wherein we care about the distance of each indicator from its threshold. Empirical evidence about debt crises of emerging markets over the period 1975–2002 proves that our methodology predicts 80% of the total defaults and non‐defaults in and out of sample. Copyright © 2012 John Wiley & Sons, Ltd.