煤储层吸附特征研究现状及展望   总被引：11，自引：0，他引：11  

张晓东秦勇  桑树勋 《中国煤田地质》2005,17(1):16-21,29

从吸附机理、吸附数学模型、吸附影响因素以及多元气体吸附等几个方面，综述了国内外煤储层吸附气体研究的现状，分析了当前我国煤储层吸附研究中存在的问题和难点，对下一步煤储层吸附研究的发展趋势和需要解决的问题作了进一步的探讨。  相似文献   

常熟市可持续农业与农村发展系统评价及其规划   总被引：4，自引：2，他引：2  

罗守贵  曾尊固  王伟伦  涂为员  杨建新 《地理科学》2000,20(5):437-443

杏持续农业与农村发展（ＳＡＲＤ）是发达国家与发展中国家面临的共同问题,而不同地区ＳＡＲＤ所处的阶段不同,发展模式也各具特色。科学地确定其发展偏离度并为其未来发展作出合理的规划,具有重要的理论与实践意义。文章构建了ＳＡＲＤ多目标规划模型,运用它对常熟市过去８年进行了系统评价,并对未来发展进行了动态规划,得出了３个不同的投入方案。  相似文献   

兖济滕矿区地质环境综合评价     

郝启勇  尹儿琴  鲁孟胜  林树杰  张心彬 《煤田地质与勘探》2006,34(2):48-51

提出了矿区地质环境综合评价的概念和目的,并通过对矿区的系统研究,建立了兖济滕矿区地质环境综合评价指标体系,采用专家调查-层次分析法确定了各评价指标的权重,并且利用模糊数学方法对矿区地质环境综合质量进行了评价。结果表明,济宁矿区和滕北矿区的地质环境综合评价等级为Ⅰ级(较轻),兖州矿区和滕南矿区分别为Ⅲ级(较重)和Ⅳ级(重)。   相似文献   

Perception and attitudes of local communities towards wild elephant-related problems and conservation in Xishuangbanna,southwestern China     

Qingcheng?He  Zhaolu?WuEmail author  Wai?Zhou  Rui?Dong 《中国地理科学(英文版)》2011,21(5):629-636

The problem of wild elephants, or human-elephant conflict (HEC), influences the daily life of local communities and hinders the conservation of wild elephants.The perception and attitudes of local communities who inhabited the frontiers between human activities and wild elephant movement are important to the mitigation of the HEC and conservation of wild elephants. To analyze the perception and attitudes of local communities, the Participatory Rural Appraisal (PRA) was used in the investigation of 423 interviewees from 22 villages in Xishuangbanna from July 2009 to February 2010. The results indicated that local communities had their views on the elephant-related problems. In field survey, we found that 66.5% of interviewees were willing to support, participate in, and assist in the conservation of wild elephants;33.5% of interviewees were opposed or indifferent to such conservation, because their livelihoods and even their lives were endangered by wild elephants. These views and attitudes were influenced by local communities′perception of HEC, education level, gender and self-interest. Therefore, it is necessary to analyze the diverse views among local communities and balance profits and costs in addressing HEC.  相似文献   

单元矿床值概率分布法在新疆东部地区铁矿资源预测中的应用     

Guo Ruiqing 《地球科学与环境学报》1997,(1)

矿床在空间的分布是不均匀的，它受到区域地质构造的控制，又受到大量随机因素的影响，具有一定的统计规律．研究这种统计规律，就可以进行预测。本文尝试用“单元矿床值概率分布法”预测铁矿资源。  相似文献   

肝癌与地形地貌类型关系初探     

曾昭华  曾雪萍 《南方国土资源》1997,(2)

文章利用地形地貌资料４５０２个数据，肝癌死亡调查资料８３４３例，研究了肝癌死亡率与人群生存的地形地貌类型的相关性。在此基础上综合评价了与肝癌有相关性的地形地貌类型对肝癌产生和发展的影响  相似文献   

青海省门源县铜厂沟金矿3号矿化蚀变带的发现与评价     

刘军  ;靳淑韵  ;张汉成  ;肖荣阁  ;安国英 《物探与化探》2014,(5):879-884

青海省门源县铜厂沟金矿床位于北祁连造山带,为受构造蚀变破碎带控制的构造蚀变岩型金矿床,属于高品位小型金矿床,资源面临枯竭。通过野外工作,在矿区西部新发现一条矿化蚀变带,通过3条剖面样品分析,矿化蚀变带有明显的地球化学显示,原生晕样品中金含量最高在(0.2~4.5)×10-6,次生晕土壤样品金含量最高为0.1×10-6,且银也有明显的异常显示。各种化学方法处理的数据均在3号矿化蚀变带表现出明显的转折点,说明3号矿化蚀变带是客观存在的地质体,并且有一定延伸。通过激电中梯物探方法进行异常查证,发现低阻、高极化异常带延伸通过处,正是3号矿化蚀变带位置,二者对应良好。地质、化探和物探三者对应良好,表明该区仍有一定找矿前景,下一步工作应重点针对3号矿化蚀变带进行勘探。  相似文献   

Study on applying optimal path to land valuation     

Wang Wei  Dong Fei  Shi Lite  Cao Fang 《地球空间信息科学学报》2013,16(1):49-54

As an important role in the urban land price system, the basic land price appraisal directs and reflects all kinds of land price in the real estate market. Using geographic information systems (GIS) with algorithms and powerful analysis functions to valuate land will improve the rationality and convenience of land valuation. The objective of the study on basic land price using the optimal path algorithm is to decrease the manmade error, enhance automatization, avoid make inconvenience by roadblock object.  相似文献   

Globalizing Polycentricity in Istanbul: Mamdani-Type Fuzzy Rule-Based Model of CBD Office Space Rents     

《Urban geography》2013,34(8):1212-1248

For some two millennia Istanbul has been one of the world's greatest cities, and is today classified as an "Alpha-" world city in the Globalization and World Cities (GaWC) group's 2010 rankings. Istanbul is an emerging global city that is facilitating Turkey's transnational integration into the global economy, and as of June 2009 the city had the second largest office stock among all Southeast European countries. This paper investigates the determinants of office rent levels in the city's Central Business District (CBD) and the spatial variation of rents in a polycentric metropolis. The paper uses a stepwise regression and a Mamdani-type fuzzy rule-based model to estimate office space rents, and compares empirical results with those of a conventional OLS regression analysis. Rents are driven not only by physical characteristics and locational services, but also the terms of lease contracts. New CBD locations that command the highest rents on spacious, high-rise office spaces with comparatively few employees conform well with contemporary accounts of world-city financial districts, and confirm the significance of urban office infrastructures for globally oriented financial elites beyond the familiar roster of Global North world cities. The traditional center retains the core purpose identified nearly a century ago, in Marshall's analysis of centralization during the most vibrant period of the industrial age. Despite all the transformations of transnational urbanist polycentricity, the traditional CBD is still the place with the most diverse mix of activities, and the greatest variation in rents.  相似文献   

芜湖市土地利用综合效益评价   总被引：3，自引：0，他引：3  

李玉伟  程先富 《云南地理环境研究》2008,20(4):94-98

通过建立芜湖市土地利用综合效益评价指标体系,利用相关分析法确定指标间的相关系数进而确定各评价指标权重,构建芜湖市土地利用效益综合评价模型及预测模型,最后运用数理统计方法对结果进行分析。分析：1990～2005年芜湖市土地利用综合效益水平总体处于上升趋势,土地利用综合效益指数达到94．3。结果表明：芜湖市土地利用正沿着一条以生态建设为中心,生态、社会、经济建设为一体的可持续的道路发展,并且成果显著。预测：2010年芜湖市土地利用综合效益指数达到99．6,但是增加幅度较往年减少。建议：由于芜湖市土地利用经济效益波动较大,政府要协调好经济建设与生态建设、社会建设的关系。  相似文献