研究生体育锻炼性别差异研究

对安徽省7所大学在读研究生体育调查表明,研究生体育锻炼缺乏,对体育锻炼的认知态度及实际参与情况存在性别差异。高校应重视研究生体育课程建设,积极开展课余体育活动,提高女生参与体育锻炼的热情。     

经济地理学的发展及其战略咨询作用

近10多年来,我国经济地理学发挥了交叉学科的优势,在国土开发战略研究、国家和重点区域的规划和可持续发展方面完成了一系列重大任务,发挥了独特的战略咨询作用。文章就继续强化这一方向提出了若干理论和实践的要求。     

地区专业化、产业集中与经济集聚——对我国制造业的实证分析

以新经济地理学模型为基本理论框架,对我国各省区专业化水平、制造业各行业的集中程度和整个制造业的集聚程度进行了实证分析,结果显示1993—2003年间我国各省份的专业化水平呈显著上升趋势,制造业大部分行业集中程度提高,整个制造业集聚程度上升。在制造业各行业集中程度和整个制造业集聚程度的测算中,引入SP指数,结果显示这一指标的引进是非常必要的。     

库存周期计算的价值方法和实物方法研究

研究比较了库存周期计算的价值方法和实践中常常使用的实物方法,并以钢铁制造企业的钢卷产品为例加以说明。     

Is fertiliser use inconsistent with expected profit maximization in sub‐Saharan Africa? “Evidence from Nigeria”

This article revisits a conventional wisdom that inorganic fertiliser use across sub‐Saharan Africa is too low. This expectation that more farmers should be using inorganic fertiliser, and at higher rates, implies it is profitable to use rates higher than observed if farmers are rational expected profit maximisers. We obtain consistent estimates of the effects of applied nitrogen on rice production. We find the yield response to applied nitrogen to be low in the main rice growing farming system. Farmer behaviour is not inconsistent with expected profitability which is limited by a low yield response to applied fertiliser, high transportation costs, and low selling prices for rice in rural areas. In particular, we do not find any farmers for whom applied nitrogen is profitable that are not using fertiliser in the study sample for each of our survey years (2010 and 2012).     

International Trade and the Environment: Theoretical and Policy Linkages

I review and extend three approaches to trade and environmental policies: competitive general equilibrium, oligopoly and monopolistic competition. The first two have surprisingly similar implications: deviations from first-best rules are justified only by constraints on policy choice (which motivates what I call a “single dividend” approach to environmental policy), and taxes and emissions standards differ in ways which reflect the Le Chatelier principle. I also show how environmental taxes may lead to a catastrophic relocation of industry in the presence of agglomeration effects, although not necessarily if there is a continuum of industries which differ in pollution intensity. *An earlier version was presented as an invited plenary lecture to the European Association for Environmental and Resource Economics Conference, Oslo, 1999.     

跨国公司在华R&D的空间格局及成因

伴随着RD全球化,跨国公司海外RD的空间布局问题成了地理学研究的热点。通过分析外资在华RD的空间特征,并从新经济地理学视角实证考察其空间格局形成的内在机制。我国外资RD主要集中在东部沿海少数区域,且高度聚集在大型中心城市,区域差异显著。实证结果表明,劳动力成本、优惠政策等传统区位变量未能很好地反映外资在华RD的空间格局,而新经济地理理论所揭示的贸易成本、技术溢出、市场规模、外资区域生产水平以及区域历史外商RD投资等集聚变量是导致外资RD空间集聚的重要原因。     

基于模糊机会约束的物流配送路径优化

在建立基于模糊机会约束的物流配送路径优化问题的数学模型基础上,构造了求解该问题的模糊模拟遗传算法。并用实例验证,结果表明用此算法可以有效的求解此类不确定问题,具有良好的寻优能力。     

天津市大学生体育锻炼态度与体育锻炼行为的研究

文章对天津市六所大学中一年级和四年级的男、女大学生的体育锻炼态度和影响参加体育锻炼的因素进行研究和分析,旨在对体育锻炼态度和体育锻炼行为进行研究。