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土地利用规划的生态风险分析   总被引:3,自引:2,他引:1  
本文通过对土地利用及土地利用规划基本特性分析,提出土地利用规划生态风险源的五个方面,即土地利用规划的预测性、实施的长期性、决策主观性、土地利用的低可逆性、土地资源的系统性,描述了土地利用规划生态风险的主要表征:诱发泥石流或其发生频率增加、水土流失加剧、人居环境恶化、森林覆盖率降低、气候异常变化。  相似文献
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姚新胜  王清宇  徐杏 《经济地理》2006,26(4):573-576
立足于区域经济发展和产业结构演变理论,建立了几个交通运输区域特征评价的宏观性指标,并以我国近几年来交通运输业的相关统计数据进行了计算,就东、中、西部地区的运力和运量分布进行了区域特性分析,揭示了交通运输业和国民经济之间的某些区域性特征关系,结合四川省的具体情况进行了数据实例分析,为新形势下我国交通运输发展战略选择和政策制定提出了一些参考性建议。  相似文献
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We consider general OLG economies under uncertainty, with short maturity assets and with dividend paying assets of infinite maturity and fiat money, and study the optimality properties of equilibria with a sequence of asset markets that are sequentially complete. We provide necessary and sufficient conditions, in terms of asset prices and dividends, for equilibria to be conditionally Pareto optimal. These results provide a theoretical basis for empirical investigation.  相似文献
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In many economic decision problems the preferences of economic agents depend on the numbers or proportions of individuals choosing the same decision or other decisions. Examples include network or congestion externalities, location choices of firms, the tourist's choice of a vacation destination, the visit of public events like concerts, or the purchase of goods that are subject to fashion. In this article the relating equilibrium characterization and selection questions are formulated and solved in terms of anonymous games with a continuum of players facing a binary decision problem. Journal of Economic Literature Classification Numbers: C72, D62.  相似文献
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Concede-and-divide is a widely accepted procedure to solve the problem of adjudicating two conflicting claims. In this paper we show that this procedure can be characterized by combining three standard properties in the literature: self-duality, lower securement, and restricted composition up. We also show that self-duality can be replaced by the dual properties of lower securement and restricted composition up and that both characterization results are tight.  相似文献
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Summary. This paper presents and characterizes a two-parameter class of inequality measures that contains the generalized entropy measures, the variance of logarithms, the path independent measures of Foster and Shneyerov (1999) and several new classes of measures. The key axiom is a generalized form of additive decomposability which defines the within-group and between-group inequality terms using a generalized mean in place of the arithmetic mean. Our characterization result is proved without invoking any regularity assumption (such as continuity) on the functional form of the inequality measure; instead, it relies on a minimal form of the transfer principle – or consistency with the Lorenz criterion – over two-person distributions. Received: October 27, 1997; revised: March 25, 1998  相似文献
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Modern food systems are characterized by a range of resource use, environmental, and socioeconomic impacts, resulting from choices made by various actors, including the public, who are “distanced” from these impacts, with important implications for sustainability. In order to make ecologically responsible food choices, the public will need information that is reliable, easily comprehensible, and that allows them to discriminate between these choices in terms of the range of impacts, and their trade-offs with factors such as market price.We illustrate, by means of a case study involving nine variations of two meals of similar nutritional energy content, some challenges and issues associated with estimating and integrating the diverse impacts of food systems, and explore the implications of our results for communicating these impacts in a manner that balances epistemic adequacy with heuristic usefulness in enabling ecologically responsible food choices.  相似文献
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《左传》是包含着多样的叙事模式的史传文学的典范。《左传》作为编年体史书开中国叙事文学的先河。对于叙事作品,如果把人物拿掉了,那几乎就称不上是叙事了,人物是叙事的灵魂。"正如亨利.詹姆斯在一段常被引用的话里所说的:‘除却决定情节之外,人物还能是什么呢?除却表现人物之外,情节还能是什么呢?’"这段话,无疑给我们传达了这样一个信息:人物是叙事的核心。  相似文献
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An inequality index is called subgroup decomposable if it can be expressed as a weighted sum of inequality values calculated for population subgroups plus inequality arising from differences among subgroup means. This paper derives the class of subgroup decomposable inequality indices that satisfies the Bossert–Pfingsten type intermediate inequality invariance. When the intermediate inequality equivalence concept coincides with the relative notion of inequality, the derived class becomes the Cowell–Shorrocks generalized entropy family. For comments and suggestions, we are grateful to Peter J. Lambert and two anonymous referees. We thank Chranjib Neogi for drawing the only figure of the paper.  相似文献
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