Bioenergy Crop Production in the United States: Potential Quantities, Land Use Changes, and Economic Impacts on the Agricultural Sector

The U.S. Departments of Agriculture and Energyjointly analyzed the economic potential for,and impacts of, large-scale bioenergy cropproduction in the United States. Anagricultural sector model (POLYSYS) wasmodified to include three potential bioenergycrops (switchgrass, hybrid poplar, and willow). At farmgate prices of US $2.44/GJ, anestimated 17 million hectares of bioenergycrops, annually yielding 171 million dry Mg ofbiomass, could potentially be produced at aprofit greater than existing agricultural usesfor the land. The estimate assumes highproductivity management practices are permittedon Conservation Reserve Program lands. Traditional crops prices are estimated toincrease 9 to 14 percent above baseline pricesand farm income increases annually by US $6.0billion above baseline.At farmgate prices of US $1.83/GJ, anestimated 7.9 million hectares of bioenergycrops, annually yielding 55 million dry Mg ofbiomass, could potentially be produced at aprofit greater than existing agricultural usesfor the land. The estimate assumes managementpractices intended to achieve highenvironmental benefits on Conservation ReserveProgram lands. Traditional crops prices areestimated to increase 4 to 9 percent abovebaseline prices and farm income increasesannually by US $2.8 billion above baseline.     

工业共生效益分析——以九发工业园为例

本文在深入阐述工业共生及其效益的基础上,以九发工业园为例,详细分析了涉农企业发展生态工业园带来的经济效益、环境效益和社会效益,指出涉农企业应立足农业特点,借鉴工业生态学原理,积极构建农工商结合的生态产业体系。     

出生缺陷地理风险因子的空间分析

出生缺陷是影响人口出生质量最重要的因素。大量研究表明,出生缺陷仅仅靠单纯的生物医学研究还不够,多学科的交叉研究是有效探讨出生缺陷病因和预防的唯一出路。利用北京大学人口环境健康组调查数据,分类了能够在地理空间上归属的出生缺陷风险因素,将这些因素存在的空间相关性进行了传统统计分析方法不适宜的风险因子与出生缺陷统计因果之间的研究。探讨了空间分析技术在出生缺陷的地理风险因子研究的一般步骤与关键技术,为出生缺陷研究提供了新的思路。     

Regulatory and environmental effects on public transit efficiency: a mixed DEA-SFA approach

This paper assesses the impact of regulatory and environmental factors and statistical noise on the efficiency of public transit systems within a DEA-based framework. Using a panel of Italian companies, we implement a DEA-SFA mixed approach based on [H.O. Fried et al. (2002) Journal of Productivity Analysis, 17(1–2), 157–174] to decompose DEA inefficiency measures into three components: exogenous effects, managerial inefficiency and stochastic events. Besides providing evidence on the determinants of input-specific efficiency differentials across companies, the results point out that managerial skills play a minor role, and emphasize the relevance of regulatory policies aimed at replacing cost-plus subsidization with high-powered incentive contracts as well as improving environmental conditions of public transit networks.      

农业产业化经营中利益相关者关系、目标选择与实现方式

本文指出,农业产业化经营的利益相关者是农业价值创造和价值实现的重要影响因素,正确处理好利益相关者关系,有利于保障和提升农业利益,有利于农业价值创造与农业价值实现,这包括农户与龙头企业、政府、中介组织、合作经济组织以及龙头企业与协会之间的关系。农业产业化经营要以产业运作过程商品化、利益分配合理化等方式,实现农业价值创造最大化和农业价值分配最优化的农业产业化目标。     

注册会计师行业监管的若干问题研究

针对我国对舞弊的会计师事务所处罚力度明显不够的事实，监管机构应加大处罚力度，在确定合理处罚的基础上选择适当的监管力度，政府监管力度按成本效益原则确定监管费用的最优投入，决定监管机构的规模和大小，并完善相关的机构建设。     

INTEREG: A Twenty-region Input–Output Model for Italy

Since the regional scale turns out to be the scale at which fiscal devolution is likely to be accomplished in Italy, and that at which trade and growth interdependencies as well as regional convergence can be most conveniently investigated, a new 20-region input–output model for Italy seems to be a useful tool of analysis. Although various regional and interregional models have been constructed since the 1950s, none has been implemented for the whole system of 20 Italian administrative regions considered in their tight mutual dependence; also, the pool approach has not been greatly favoured, even in situations where direct information on regional trade is lacking. The main purpose of this paper is to report on the structure of the model, the rather complex procedure used in the model construction and the adopted solution technique. Some space is devoted to the problems encountered in handling regional trade endogenously in an input–output setting and to a comparison between the pool approach, used in the Italian model, and other current techniques. The paper also reports on some preliminary results regarding the regional impact of fiscal policy.     

四川与东盟旅游服务产业内贸易的核心因素初探

中国-东盟自由贸易区的建设为四川旅游业的发展带来了历史性的契机。在此背景下,四川如何抓住机遇,携手东盟,共谋发展成为了一个研究热点。本文以产业内贸易的视角来观察四川与东盟的旅游业发展状况,运用产业内贸易相关理论分析了影响四川与东盟旅游服务产业内贸易的核心因素,提出了区位条件、产品差异化、需求相似、区域经济协作和规模经济可以提升四川与东盟旅游服务产业内贸易水平,双方可以在较高的产业内贸易水平下,实现共赢。     

区域物流规划中的农业与农村物流问题探讨

提出了农业与农村物流的概念,并分析了其特点。在明确区域物流规划任务的基础上,指出农业与农村物流应该是区域物流规划的一个重要内容。从农业与农村物流和城市物流的关系、农业与农村物流规划的内容、农业与农村物流节点布局和农业与农村物流运作主体培育等四个方面论述了区域物流规划中农业与农村物流规划的思路,并简要论述了农业与农村物流规划的保障措施。     

城郊农业与郊区农业产业化问题--以芜湖市为例

城郊农业是一个特殊的农业生产地域类型。本文论述了随着城市发展所引起的城市郊区地域结构的变化，并以芜湖市为例，对城郊农业产业化及其发展方向－持续农业问题进行了初步讨论。