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Search Results: 1 - 10 of 35259 matches for " 曹锐 "
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基于WPI模型的赣江流域水资源贫困评价
,
资源科学 , 2012,
Abstract: 以流域为单元对水资源贫困水平进行评价,可以为流域的可持续发展提供决策依据。本文以水贫困理论为基础,在调查和分析赣江流域水资源现状的基础上,应用WPI方法,从水资源状况、供水设施状况、资源利用能力、资源使用效率及资源利用对环境状况的影响五个方面选择16个指标,用主成分分析法确定指标权重构建综合指数模型,建立一套流域水资源贫困评价指标体系和评价模型,对赣江流域水资源贫困水平进行评估。评估结果表明,赣江流域水资源贫困状况有所改善,水环境质量呈逐年变好趋势,从水资源管理角度来看,环保投资指数成为影响水资源贫困水平的主要控制因子。
风险企业债务估值未定权益分析的两个公式
国华,
重庆大学学报 , 2003, DOI: 10.11835/j.issn.1000-582X.2003.03.027
Abstract: 风险债务与无风险债务的估值有显著差异,风险债务估值不仅其收入流不确定,并且其贴现率也不确定,因此得不到一种解析表达式。不考虑贴现率即利率的变化,这样便能专注于资产价值的不确定性对债务价值的影响。未定权益分析作为期权定价理论的推广,广泛运用于债务估值,并能给出解析表达式。把默顿给出的公式的与布莱克等人给出的公式进行比较,说明了两个公式运用所需的条件,并进行了评述。
中国农业转移人口市民化的空间特征与影响因素
,广忠
地理科学进展 , 2014, DOI: 10.11820/dlkxjz.2014.06.003
Abstract: 本文利用第6次人口普查数据和公安部门登记数据,分析了全国各省(市、区)需要市民化的农业转移人口的规模、结构以及市民化推进程度的空间特征。研究发现,全国待市民化人口每年新增1510万,东部沿海以跨省市迁移为主,中部地区以省内迁移为主。采用迁移人口中的落户人口与总迁移人口的比值考察不同地区迁入人口落户难度,发现中部地区落户最易,西北地区其次,东部沿海最难。影响市民化进程的因素,一是高昂的市民化成本,特别是需要政府承担的公共成本部分抑制了市民化进程;二是现行的财政体制下转移人口市民化的成本主要由迁入地政府负担,降低了地方政府的积极性;三是现有产业人口与落户要求不匹配,使得粗放型产业所吸引的就业人群难以达到落户门槛。本文进一步结合户籍制度改革的动力机制分析,从政府投资体制和空间资源配置两方面就不同地区转移人口市民化对策问题进行了初步讨论。
遥感技术监测海冰密集度
梅盛,晋 
遥感技术与研究 , 2006,
Abstract: ?概要评述可见近红外、主/被动微波遥感技术监测海冰密集度的基本原理、算法及其优缺点。着重介绍和讨论被动微波传感器smmr和smm/i遥感图像混合像元内海冰总密集度,一年海冰及多年海冰密集度的nasa算法及其天气滤波器。
一种新型锁相环输出寄生边带的理论分析
,宋俊寿
重庆大学学报 , 1991,
Abstract: 在简要介绍一种新型数字频率合成锁相环的基础上,详细分析了此环路对其鉴相器输出端具有特殊性质的寄生信号的抑制。结果表明,此环路的输出寄生边带抑制比是令人满意的。
连续纤维复合材料及其发展历程
,岳清瑞
工业建筑 , 2001, DOI: 10.13204/j.gyjz200109018
Abstract: 介绍了连续纤维复合材料(FRP)的诞生和发展,日、美、欧等发达国家和地区已投入了大量的人力和物力进行其在土木工程中的研究开发,并取得了不少成功的可借鉴的经验。
公司治理的政府介入结构分析
, 国华, 杨秀苔
中国管理科学 , 2001,
Abstract: ?针对当前我国股份公司治理机制的现状,本文构造了一个相应的模型,应用博弈论方法证明,政府过度介入公司治理将严重影响公司运行效率,认为国有资产应当尽快退出产业部门,以此消除国有企业改革的产权障碍,并且指出这应是当前最为急迫的一项任务。
黑龙江东部盆地群早白垩世早期海侵作用续探——以鸡西盆地鸡D7井为例
,张永生,宋天
地球学报 , 2013, DOI: 10.3975/cagsb.2013.01.10
Abstract: 黑龙江东部盆地群是我国东部重要的中生代陆相含油气区,属东北含油气亚区的一部分。早白垩世以陆相湖泊沉积为主,但有多次规模不等的海侵事件发生,本次研究进一步对鸡西盆地鸡D7井下白垩统城子河组和穆棱组砂岩的结构构造、矿物排列、碎屑岩组分、胶结物、综合结构系数、重矿物等特征进行了综合分析研究:在早白垩世地层发现了具典型滨海潮下带特征的双粘土层构造;该层位砂岩多为少石英或者石英含量在25%左右的长石岩屑砂岩和岩屑长石砂岩;胶结物以碳酸盐为主;受海侵作用影响,城子河组砂岩综合结构系数平均值为20.16,穆棱组平均值为46.65,表明穆棱期比城子河期受海侵影响更为明显;并且在砂岩中发现重矿物20余种,呈条带状富集,尤其是特征矿物海绿石、自生独居石、莓状黄铁矿及自然金等具明显海侵相特征。本次研究为黑龙江东部盆地群海侵的存在提供了一系列沉积学证据。
互联网命名问题研究
,吴建平?,徐明伟?
软件学报 , 2009,
Abstract: 分析了互联网命名问题的研究内容以及当前存在的问题,对命名空间和主要技术的现状进行了分类和介绍.讨论了命名问题研究中的重要思想,以及未来命名问题研究可能的发展方向.
Assessment of Water Poverty in Ganjiang Basin Based on WPI Model
基于WPI模型的赣江流域水资源贫困评价

CAO Qian,LIU Rei,
,

资源科学 , 2012,
Abstract: Water poverty is defined as the lack of water in nature or the capacity to use water, and can be divided into two levels : natural level and eco-social level. With The author treated watershed as a basic unit, this paper has for study to builtd a reasonable water poverty assessment index system, use WPI model and made appropriate modifications based on the watershed situation, which. The assessment of water poverty is decided by multiple ingredients. The new index system includes natural resource, access, capacityital, usage and environment to assess the water poverty in Ganjiang Basin. Among them, natural resource Access sub-system refers to the use of groundwater and surface water resources. The access use sub-system reflects the degree of public access to clean water and water security. The capacity sub-system reflects the impact of socio-economic conditions onto the water industry by, considering all aspects of integrated water management. The usage sub-system reflects the efficient use of water use efficiency in industry, agriculture and other departments and the environment sub-system includes potential pressure suffered by water quality and ecological environment, which reflects the impact of resource utilization on environmental impact of resource utilization. In this paper, weights of the indexes in each sub-system werewere determined by PCA (Principal Component Analysis) method. The theory of WPI was used in Ganjiang Basin and data for analysis were collected from Jiangxi Province Statistic Yearbooks (2008-2010), Jiangxi Province Environment Statistic Yearbooks (2008-2010), Jiangxi Province Environmental Comprehensive Improvement Examination Results (2008-2010), Jiangxi Province National economic and social development Statistic Yearbooks, and field survey results fromin Jiangxi Province Environmental Protection Office. In terms of regional exploratory spatial data analysis, the basin could be classified into three categories. The assessment rResults showed that the situation of water poverty inof Ganjiang Basin wasere better in 2007-2009, but while slightly a little worsereduce in 2009 due to, there are problems in management; the situation in Nanchang city was relatively severer, because of the pressure of population and polluting enterprises, while. Whereas thatat in Xinyu city, Pingxiang city, which are which located in the middle of the basin, wasere better. This coincides with water pollution situation in Ganjiang Basin. The bad water poverty situation sudden fall into a bad situation in Jian city mainly results from, its deep reason is the decrease plummeted of environmental protection investment index and, the pollution control investment, while reducing the environmental protection investment index is the main manipulative indicator for while the growth of the GDP, which further causes water poverty aggravated.Tthe good situation of water poverty in Ganjiang Basin was getting better, and the environmental protection investment
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