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草海湿地生态系统健康评价 被引量:34
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作者 彭益书 付培 杨瑞东 《地球与环境》 CAS CSCD 北大核心 2014年第1期68-81,共14页
贵州省威宁草海是贵州最大的天然高原淡水湖泊,同时也是我国亚热带高原湿地生态系统的典型代表,成为中国西南地区迁徙水禽的重要越冬地和停歇地。但草海湿地生态系统由于人类活动加剧引起的其功能作用会削弱、生物多样性会降低、水体富... 贵州省威宁草海是贵州最大的天然高原淡水湖泊,同时也是我国亚热带高原湿地生态系统的典型代表,成为中国西南地区迁徙水禽的重要越冬地和停歇地。但草海湿地生态系统由于人类活动加剧引起的其功能作用会削弱、生物多样性会降低、水体富营养化等生态环境问题多方面的影响导致其表现出明显的生态脆弱性,尤其是在其生态系统的生态环境方面表现尤为突出。如果草海受到多方面的影响不及时加以制止和消除,将直接威胁着草海湿地生态系统的稳定。本文首先从湿地的生态特征、功能和社会经济环境三个方面的30个主要影响草海生态健康的因子进行分析,并对每个因子的健康状况进行调查、分析说明。其次,利用模糊综合评价模型中的层次分析法对草海生态健康影响的30个主要因子进行了整合分析,并对草海现在的健康状况应用平均加权原则进行了评估。最后,针对草海目前的健康状况,对草海今后的防治提出了相关建议。 展开更多
关键词 草海 生态健康 模糊综合评价 层次分析法 平均加权原则
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Landfill Siting Using GIS and AHP (Analytical Hierarchy Process): A Case Study AI-Qasim Qadhaa, Babylon, Iraq 被引量:1
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作者 Ali Jalil Chabuk Nadhir A1-Ansari +2 位作者 Hussain Musa Hussain Sven Knutsson Roland Pusch 《Journal of Civil Engineering and Architecture》 2016年第5期530-543,共14页
The selection of a landfill site is considered as a complicated task because this process is based on many factors and restrictions. For Al-Qasim Qadhaa, which is situated in the southern part of the Babylon Governora... The selection of a landfill site is considered as a complicated task because this process is based on many factors and restrictions. For Al-Qasim Qadhaa, which is situated in the southern part of the Babylon Governorate, Iraq, there is no landfill site in that area that conforms to the scientific criteria for selecting sites for landfill. For this reason, 15 criteria were adopted in this study (groundwater depth, rivers, soil types, agriculture lands use, land use, elevation, slope, gas pipelines, oil pipelines, power lines, roads, railways, urban centers, villages and archaeological sites) using GIS (geographic information system), which has a large ability to manage input data. In addition, the AHP (analytical hierarchy process) method was used to derive the relative weightings for each criterion using pair-wise comparison. To obtain the suitability index for candidate landfill sites, a weighted linear combination method was used. After combining these methods, two suitable candidate landfill sites, with areas of 2.766 km2 and 2.055 km2, respectively, were found to satisfy the scientific and environmental requirements. The area of these sites can accommodate solid waste from 2020 until 2030 based on the required area, which was 0.702 km2. 展开更多
关键词 LANDFILL AI-Qasim Qadhaa AHP (analytical hierarchy process) GIS WLC (weighted linear combination).
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加权Lane-Emden方程组在紧集外正稳定解的不存在性
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作者 叶旦婷 《嘉兴学院学报》 2021年第6期35-38,共4页
研究了加权Lane-Emden方程组在紧集外正稳定解的不存在性问题,通过Pohozaev等式建立了该方程组稳定性定理,并证明了正稳定解的不存在性.
关键词 Lane-Emden方程组 Pohozaev等式 稳定解 加权
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