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天津市水资源供需现状与预测研究
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作者 马宗文 卢亚灵 许学工 《天津科技》 2016年第12期61-65,69,共6页
以天津市为例研究我国北方高强度开发的水资源供需问题。分析天津市近几十年的水资源供用现状,结合区域发展规划预测其2020年水资源需求量和供应量,并对其水资源供需平衡进行分析。结果表明,天津市近年年均水资源量为16.90亿m3,水... 以天津市为例研究我国北方高强度开发的水资源供需问题。分析天津市近几十年的水资源供用现状,结合区域发展规划预测其2020年水资源需求量和供应量,并对其水资源供需平衡进行分析。结果表明,天津市近年年均水资源量为16.90亿m3,水资源供需一直存在较大矛盾;2020年水资源需求量为52.53~54.90亿m3,供应量为48.04~50.54亿m3。在平水年(50%,保证率),水资源供需平衡为-1.99亿m3,少量缺水;在偏枯水年(75%,保证率),水资源供需平衡为-6.86亿m3,会出现水资源短缺情况,若遇特枯水年缺水则非常严峻。针对水资源短缺的情况,天津市需要采取各项措施开源节流,保证水资源供应。研究具有一定的学术价值和现实意义。 展开更多
关键词 水资源供需平衡水资源需求水资源供用预测天津市2020年
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跨区域物流网络优化的模型与算法的改进研究 被引量:7
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作者 孔荣娟 艾时钟 《工业工程与管理》 CSSCI 北大核心 2012年第2期57-61,108,共6页
针对跨区域物流网络存在的非优问题,综合考虑物流运输成本、过城费、出入库费、装卸费、仓储费以及物流网络流量等决策因素,建立了双目标数学模型:最小化物流总成本和最大化物流网络流量。给出了改进的最小费用最大流算法,并结合有供需... 针对跨区域物流网络存在的非优问题,综合考虑物流运输成本、过城费、出入库费、装卸费、仓储费以及物流网络流量等决策因素,建立了双目标数学模型:最小化物流总成本和最大化物流网络流量。给出了改进的最小费用最大流算法,并结合有供需需求的网络流算法和典则型网络转化法对模型进行求解。最后,通过MATLAB仿真实验,证实了模型的价值和算法的有效性。 展开更多
关键词 跨区域 物流网络 最小费用最大流算法 供需需求
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Institutional Options for the Settlement of Administrative Disputes in China:From the Perspective of Public Demand
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作者 程金华 《Social Sciences in China》 2010年第3期5-26,共22页
On the basis of data obtained from a comprehensive social survey across twenty- eight provinces, municipalities and autonomous regions in 2005 (CGSS2005), we have conducted quantitative empirical research on the dis... On the basis of data obtained from a comprehensive social survey across twenty- eight provinces, municipalities and autonomous regions in 2005 (CGSS2005), we have conducted quantitative empirical research on the distribution of administrative disputes and Chinese citizens’ purposive institutional choices in dealing with such disputes. Our study found that where administrative disputes are concerned, today’s Chinese citizens are by no means apathetic about the law. However, practical constraints mean that some of them resort to other means of dispute resolution than judicial or quasi-judicial procedures. In actuality, a two-track system exists in Chinese citizens’ resolution of administrative disputes; that is, they have the same level of demand for (quasi-) judicial channels and for Party/government channels in the resolution of disputes of this kind. In addition, different social groups show a great variety of preferences in terms of choice of channels for dealing with such disputes. On the basis of empirical research we argue for further reflection on the theory and methodology of this kind of research today and call on theoretical research and institution building to show a genuine understanding of and respect for citizens’ wishes. 展开更多
关键词 administrative dispute rule of law institutional supply institutional demand public demandy
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