微型钢管桩——锚杆联合支护工程应用实例分析

微型钢管桩—锚杆联合支护是一种新的支护形式,本文结合工程实例对该支护设计施工方法进行了介绍分析。基坑监测和微型钢管桩应力测试表明基坑稳定,该新型支护体系安全可靠,有较高的推广应用价值。     

生物液体能源发展对我国农业发展和粮食安全的影响

阐述了全球生物液体能源的发展是导致近期世界粮食价格持续上涨的主要原因;我国2005~2006年是大米、小麦、玉米的净出口国,但大豆进口快速增长;我国目前所采取的政策,虽然短期内控制了部分农产品价格,但会不断积累价格上涨的风险;应准许粮食价格适当上涨,同时对城市低收入者适当补贴。     

农户奶牛养殖与乳品加工业扩展

随着收入提高和现代零售市场的发展,城乡居民乳制品需求和奶牛养殖业迅速增长。本文的研究目的是分析影响农户奶牛养殖发展的各种因素,尤其是乳品加工企业发展和布局。利用北京周边地区的农户奶牛养殖业的调查数据,通过计量经济模型分析,研究结果表明,乳品加工企业的发展和布局是影响农户奶牛养殖发展的最主要因素;除此之外,当地的交通条件和家庭非农就业等显著影响着农户的奶牛养殖发展;同时还发现,贫困农户并没有被排除在乳制品市场扩展的发展机遇之外,他们同样在乳制品市场扩展中得到益处。     

组织化潜在利润对农民专业合作组织形成发展的影响

关于农民专业合作经济组织的形成与发展,现有文献多强调外部支持,对内在动力,特别是组织化潜在利润普遍关注不够。本文基于制度变迁理论,提出追求组织化潜在利润是农民进行制度创新的动力,是组织形成和良性发展的先决条件的假说,并基于一套于2003年年底和2009年年初对全国5省380村跟踪调查形成的面板数据,对假说进行了检验。     

Will the Biosafety Protocol hinder or protect the developing world: Learning from China’s experience

Uncertainties about the effect of Biosafety Protocol (BSP) on global agricultural trade have caused concern among those with a stake in agrifood imports and exports. The primary goal of this paper is to analyze the potential economic impacts of the BSP on both importing countries with a specific emphasis on China and exporting countries of soybean and maize. The results show that in absolute terms the BSP will require large investments internationally and will induce compliance costs. The BSP will increase the international price and domestic production in importing countries, and lower international trade and domestic production in the exporting countries. In absolute terms the impacts are large, amounting for each commodity into the tens of millions of dollars and varying largely among different scenarios. But in the percentage the impacts are small. Much smaller impacts are found in China because China has already invested in a system that provides almost all of the services that could be required by the BSP. Other developing nations may need more help; and that it will be more costly.     

How do consumers determine the safety of milk in Beijing,China?

In asymmetric information markets, consumers often rely on certain extrinsic indictors to assess the safety of food products. This study analyzes how consumers in Beijing determined milk safety when they purchased liquid milk using survey data conducted just before the melamine-contaminated infant formula event was disclosed. The key finding indicates that milk brand and purchase venue, on average, were ranked as the first two important safety indicators in fluid milk purchases, suggesting that China's milk safety regulators should put more monitoring resources toward supervising the safety of milk produced from branded firms and milk sold in ostensibly trustable stores and not allow exemptions to inspections. Meanwhile, the findings of this study indicate that the existing milk safety certification system in China might be significantly inefficient, suggesting potential waste of regulatory resources.