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中国与东盟正式签署协议 ,承诺到 2 0 1 0年建成中国—东盟自由贸易区。四川作为西部地区的重要省份 ,一方面与东盟国家有着密切的经济和文化联系 ;另一方面有着独特的交通优势。因此中国—东盟自由贸易区的启动对四川省外经贸发展具有极其重要的意义。四川必须抓住这一有利时机 ,集中优势 ,积极开拓东盟国家市场 ,加快四川省企业“走出去” ,促进其“外向型”经济的发展。 相似文献
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《国际农业可持续发展杂志》2013,11(3):186-198
Research on sustainability in agriculture often focuses on reducing the environmental impacts of production systems. However, environmentally friendly production methods may not be sufficient to ensure the long-term economic and social sustainability of a farm. Taking a systems approach to sustainable farming, we turn to resilience thinking with its focus on the interdependence of social and ecological systems. We apply this approach to farming by conceptualizing a farm as being part of a set of systems spanning several spatial scales and including agro-ecological, economic and political-social domains. These subsystems interact and are subjected to their own complex dynamics. Within such a complex adaptive system, farm sustainability can only be achieved through adaptability and change. To be ready for the inevitable periods of turbulent change, a farmer needs to retain diversity and redundancy to ensure adaptability. Resilience is thus more likely to emerge when farmers hone the capacity to transform the farm, when farm production is attuned to the local ecological carrying capacity, and when learning and innovation are targeted outcomes. This article shows how resilience theory applied to farming may provide a more comprehensive route to achieving sustainability and offers rules of thumb as guides to building farm resilience. 相似文献
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阀配流柱塞泵的吸、排油阀,由于运动滞后,造成泵的容积效率下降,这是该类泵的一个主要技术缺陷。本文设计了一种新型配流阀,解决了运动滞后问题,容积效率得到大幅度提高。同时文中对新型配流阀的设计计算,进行了探讨。 相似文献
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Farhad Moghimehfar Elizabeth A. Halpenny Gordon J. Walker 《Leisure Sciences: An Interdisciplinary Journal》2018,40(3):174-193
The theory of planned behavior (TPB) has been successfully tested in leisure and outdoor recreation studies over the last few decades. However, the inclusion of new predictors to improve the theory's predictive power has been encouraged. Utilizing leisure constraints approach, we extended the TPB by adding constraints to the theory. The literature also suggested that individuals employ cognitive and behavioural negotiation strategies to overcome their constraints. Therefore, the influence of negotiation through the constraints was also explored in this study. A sample of 1,009 front-country campers was analyzed to test the proposed extension to the TPB. Results of structural equation modeling confirmed a strong, negative indirect association between constraints and intention. Negotiation was positively and indirectly associated with intention. The proposed extension to the TPB was capable of capturing 84% of variation in intention. Theoretical and practical implications of these findings are discussed. 相似文献
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一般来说,协调发展是区域经济发展的最高目标,而减小区域梯度差,使区域内各经济实体协调发展,也是京津冀城市群未来发展的目标。在我国的三大城市群中,京津冀城市群一直没有形成特色鲜明的二级经济中心城市,使得京津冀区域发展不平衡性明显,形成了明显的区域梯度差。本文基于城市引力模型,计算河北省各市与京津地区的城市引力值的大小,按城市引力值的大小,对河北省各个城市进行排序,形成不同的城市层级。吸引力最大形成第一层级,吸引力次大形成第二层级,吸引力较小的形成第三层级。然后针对不同引力、不同层级的城市给出产业政策或经济政策方面的建议,最终促进京津冀区域的协调发展。 相似文献
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本文运用投入产出分析方法,研究了物流业在国民经济中的作用,通过对2002年宁波投入产出表的计算分析,定量研究了物流业的产业特性,物流业对国民经济各部门的影响力系数、感应度系数、物流业的前向与后向波及效应。本文研究的结论表明:宁波物流业的影响力高于感应力,适宜采取主动发展模式;大部分的物流服务产品被国民经济各部门用作中间产品投入生产消费,物流业与其他产业的前向相关性比较强,对其他产业发展产生很大的推动作用等一系列相应结论。 相似文献
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This study explores government and industry procurement official's perception of inhibiting factor importance to competition in Federal contracting. Within the government sector as well as the industrial sector there are no significant differences in perceived factor importance. However, between the industry and government sectors significant differences in perceived factor importance do exist. The study also reveals some commonality of factors identified by both sectors as important inhibitors to competition. 相似文献