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1.
本文介绍了加拿大生态经济学家William教授提出并由其学生Wackerngel完善的生态足迹模型,总结了前人基于该模型得出的Shannon-Weaver公式、Ulanowicz的发展能力公式,指出该公式能更好地反映区域生态经济系统的发展能力。利用全国、广东省、四川省、四川南充市等不同区域2001年生态足迹计算结果、计算出不同区域层面上的生态系统多样性和发展能力分别为1.9367、1.7947、2.0526、1.1049,说明其生态足迹的发展能力均超过生态存量的发展能力。选取了四川省南充市作为特定区域进行生态足迹和生态足迹效益的时间序列计算,进行生态经济系统多样性和发展能力的动态变化分析。最后.指出提高生态经济系统多样性指数和发展能力的一条重要途径是增加生态足迹的多样性。  相似文献   
2.
大学教育的现实与改革的取向   总被引:1,自引:0,他引:1  
本文就大学教育的现实与改革阐述了个人的看法。文章认为教育理念及改革要明确其核心指向和改革的原动力。回顾和讨论了有关通识教育的历史、现状和存在的问题,对于创建世界一流大学、大学的教育质量、教育的现实环境、教学水平评估及课程体系等方面存在的一些现象进行了分析。在对中美高等教育作了简单的对比后,就建立多元化的高等教育体系、小班教学、教育改革的制度配套以及应用型、技术型本科的一些问题提出了看法和建议。  相似文献   
3.
中国加入世贸组织之后,对外经营环境得到进一步改善,出口贸易发展迅速。但由于近年来世界经济和贸易增长缓慢,各国贸易保护增强,使我国出口所面临的难度增加。在入世的新环境下,政府和企业必须双管齐下,采取积极有效的措施,才能促进我国出口贸易的进一步发展。  相似文献   
4.
Current persistent sustainability challenges are widely understood to require transitions and system innovations. As these systemic changes typically emerge from multiple co-evolving innovations, Schot and Geels [2008. Strategic niche management and sustainable innovation journeys; theory, findings, research agenda, and policy. Technology Analysis and Strategic Management 20, no. 5: 537–54] urge to study the interactions between innovation journeys. Their call for multiplicity has been met through several studies. Yet considering that these analyses still leave the attendant navigational challenges underexposed, this article demonstrates the usefulness of nested-case methodologies. Focusing on the ‘intersections’ between interpenetrating case histories, in-depth investigation is combined with broader attention to next-order changes. The relevance and implications of these intersections are illustrated through four innovation journeys in the Dutch traffic management field: unfolding largely in parallel, but sometimes intersecting, they yield a mixed picture of trajectory formation and fragmentation. The phenomenon of emergent incoherence is identified as a key strategic challenge in system innovation processes.  相似文献   
5.
This paper, in contrast to earlier studies, tests market integration using a methodology that accounts for the multiplicity problem inherent in testing several time series. This method minimises the risk of finding spurious evidence of market integration. We examine market integration among 12 fish species in Sweden by applying cointegration tests, which identify market integration for two separate clusters of species. Furthermore, we find that the Law of One Price holds for 6 of the 12 species considered.  相似文献   
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7.
High multiplicity scheduling problems arise naturally in contemporary production settings where manufacturers combine economies of scale with high product variety. Despite their frequent occurrence in practice, the complexity of high multiplicity problems – as opposed to classical, single multiplicity problems – is in many cases not well understood. In this paper, we discuss various concepts and results that enable a better understanding of the nature and complexity of high multiplicity scheduling problems. The paper extends the framework presented in Brauner et al. [ Journal of Combinatorial Optimization (2005 ) Vol. 9, pp. 313–323] for single machine, non-preemptive high multiplicity scheduling problems, to more general classes of problems.  相似文献   
8.

In this paper, we consider a discrete time risk model. First we discuss the classical model, both exponential and non-exponential upper bounds for ruin probabilities are obtained by using martingale inequalities. Then similar results are obtained for the model with investment income.  相似文献   
9.
中国电信服务业的市场化演进   总被引:5,自引:0,他引:5  
本文对中国电信分拆后中国电信业市场新格局的变化,研究和分析了今后3-5年中国电信业市场化进程的走势,并对电信公司资产的多元化、民营资本的进入、打破行政性垄断,建立市场化垄断等问题进行了较深入的研究,提出了相应的对策。  相似文献   
10.
In this study, we aim to revisit theorizing on inclusion by turning to practice theory. Challenging the individualist ontological assumption of most diversity and inclusion studies, we follow a practice-based theory of diversity to understand how an inclusive social order is accomplished. Our empirical case centres on the real-time practicing of a dance production where diversity was central to its production process as well as final performance. Using a research strategy of connected situationalism, we uncover and document three practices: mixing, inverting and affirming, that are recursively intertwined into a nexus, producing inclusion. We advance the inclusion literature by proposing the notion ‘a site of diversalizing’ that processually captures the accomplishment of multiplicity through practices and their associations in time and space, highlighting the necessity to understand ‘practice’ as the entanglement of bodily, discursive and material components, and approaching context as comprised of mutually constituting relations instead of micro/macro levels.  相似文献   
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