福建二叠系童子岩组煤炭洁净等级及其分布特征     

郑富龙 《福建地质》2012,31(1):41-44

以煤的宏量组分作为评价指标,根据福建省已勘查的118个井田(或矿区)煤的灰分和硫分分析数据,运用计算机软件对童子岩组煤的洁净等级及分布范围进行划分,结果表明童子岩组煤洁净等级主要为Ⅱ～Ⅴ级,以Ⅲ级为主,占80%以上,在各煤田均有分布;少量Ⅳ级,微量Ⅱ级和Ⅴ级。  相似文献   

Quantitatively analyze the impact of land use/land cover change on annual runoff decrease   总被引：1，自引：0，他引：1  

Jianzhu Li  Senming Tan  Fulong Chen  Ping Feng 《Natural Hazards》2014,74(2):1191-1207

Annual runoff in Luanhe river basin was detected a downward trend and caused water crisis in Tianjin, China. To quantify the decreased runoff volume, Mann–Kendall test and Pettitt test were employed to check whether there existed significant trend and change points for annual rainfall and runoff time series in Panjiakou reservoir basin and 8 sub-watersheds. It was found that the annual runoff time series had a significant downward trend at 5 % confidence level, and the change point was at 1979 in Panjiakou reservoir watershed. Then double mass curve of annual rainfall and annual runoff was plotted, and two lines were fitted before and after 1979, respectively. Based on this method, the comprehensive effects of land use/land cover change on annual runoff were estimated. To further quantify the contributions of each main factor to annual runoff decrease, water stored in check dams and social water use in different periods were surveyed first. And then multi-linear regression was used to develop the relations between annual runoff and the driven factors. Water area decrease was identified to be the main factor contributing to annual runoff reduction. The results in this study can provide valuable information for water resources planners and policy makers.  相似文献   

赞比亚Kamatete铁矿床成矿特征及成因探讨          下载免费PDF全文

葛之亮  李雷  孙成杰  毛付龙 《山东国土资源》2020,36(5):8-14

非洲中部卢弗里安弧形(Lufilian Arc)构造带,从北到南分为5个构造单元:加丹加坳拉槽-外部褶皱推覆带-穹隆区-复向斜带-加丹加高原。Kamatete铁矿床产于复向斜带构造单元中,该文通过对该铁矿床的区域地质背景、矿区地质、矿体特征及其围岩等方面进行分析研究,认为该矿床的成因类型为岩浆晚期贯入型铁矿床,铁矿床主要由富铁的二长岩类岩浆和富铁的辉长岩岩浆分异而成,少量由碳酸岩浆分异而成。  相似文献   

Tectonic Evolution of Foreland Basins in Gangdese-Himalaya Orogenic Belt:Implication for Timing of India and Asia Collision in the Early Cenozoic     

DING Lin  CAI Fulong  XU Qiang 《《地质学报》英文版》2013,87(Z1):1010-1011

  相似文献   

北斗卫星定轨中的常用光压模型比较     

陈晨  李建文  罗福龙  黄克亮  黄海 《测绘科学技术学报》2014,(5)

利用北斗精密星历作为伪观测值拟合了伯尔尼(BERN)光压模型和球光压模型的光压参数,并利用所求参数分别进行了轨道外推。通过分析轨道拟合和外推精度得到如下结论:在1 d的弧段上,BERN模型对于3类卫星GEO,IGSO和MEO的拟合精度相当且精度优于10 cm;球模型对于GEO和IGSO的轨道拟合精度相当且精度优于50 cm,明显低于其对MEO的拟合精度;对于GEO和MEO以及IGSO卫星6号星,利用BERN模型得到的外推轨道比利用球模型得到的外推轨道精度高;但对于8号,9号及10号IGSO卫星而言,利用球模型得到的外推轨道比利用BERN模型得到的外推轨道精度高。  相似文献   

中国大城市低收入邻里及其居民的贫困集聚度和贫困决定因素   总被引：11，自引：3，他引：8  

何深静  刘玉亭  吴缚龙  Chris Webster 《地理学报》2010,65(12):1464-1475

基于2007 年在中国6 个大城市开展的大规模家庭户调查,采用FGT指数法和逻辑回归分析方法,探讨中国大城市低收入邻里及其居民的贫困集聚程度和决定因素。研究发现,老城衰败邻里的贫困集聚度最高,同时承受多重不利状况的下岗/失业人员的贫困集聚度也是最高;事实贫困、被剥夺感与社会福利分配之间存在不匹配现象。在贫困的决定因素方面,制度保障和市场薪酬对城市贫困的发生具有同等重要的作用,但对不同低收入邻里和不同社会群体又表现出不同的关联性。随着市场作用的加强,市场薪酬机制正在成为贫困产生的更为重要的决定性因素。  相似文献   

基于全国第六次人口普查数据的广州新移民居住分异研究   总被引：12，自引：4，他引：8  

李志刚  吴缚龙  肖扬 《地理研究》2014,33(11):2056-2068

运用第六次全国人口普查数据,分析当前广州新移民的居住空间分异问题,探讨中国大城市新移民居住空间的整体格局、分异程度及其分异机制,并以此实证中国城市社会空间理论。研究表明：广州新移民的空间分布总体上表现出近郊集中和远郊分散的特征,其中省内新移民较多集中在中心区外围,省外新移民集中分散在远郊。广州新移民与本地常住人口的差异指数为0.48,分异指数为0.46,隔离指数为0.56,超过美国亚裔移民分异的平均水平。此外,各区的分异度水平存在较大差异。机制分析表明,历经30多年的市场化进程,制度因素对新移民聚居区的影响减弱,单位因素对新移民聚居无明显影响,市场因素的作用增强。与西方情况类似,人口和家庭因素对新移民聚居有一定影响,其中年龄因素和婚姻状况是影响新移民聚居的重要因素。总体上,市场化下中国城市新移民的社会隔离正不断转化为明显的空间分异问题。为推进社会融合,应尽快采取社会空间重构措施(如社会规划和社区规划)予以应对。  相似文献   

Early Cretaceous wedge extrusion in the Indo-Burma Range accretionary complex: implications for the Mesozoic subduction of Neotethys in SE Asia     

Zhang  Ji’en  Xiao  Wenjiao  Windley  Brian F.  Cai  Fulong  Sein  Kyaing  Naing  Soe 《International Journal of Earth Sciences》2017,106(4):1391-1408

International Journal of Earth Sciences - The Indo-Burma Range (IBR) of Myanmar, the eastern extension of the Yarlung-Tsangpo Neotethyan belt of Tibet in China, contains mélanges with...  相似文献   

采用方向滤波消除中巴地球资源卫星图像条带噪声     

陈富龙  方圣辉 《测绘信息与工程》2003,28(2):24-25

在简略分析Fourier变换滤波、中位数滤波、人工检测滤波以及方向滤波的基础上，提出了用方向模块拟合条带的斜率，并用概率统计的思想检测条带的位置，线性内插得到条带上各像素的灰度值的滤波方法，它不仅能很好地消除中巴地球资源卫星图像条带噪声，而且保留了图像上有用的信息。  相似文献   

Residential relocation under market-oriented redevelopment: the process and outcomes in urban China   总被引：3，自引：0，他引：3  

Fulong Wu 《Geoforum》2004,35(4):453-470

Residential displacement by urban regeneration in western economies and forced relocation in the Third World countries are contentious issues. This paper, based on a household survey in Shanghai, examines the process and outcomes of residential relocation under market-oriented urban redevelopment in China. The results show that commodification of the socialist tenancy right helped to initiate large-scale urban redevelopment. First, there has been a complicated process of negotiation during residential relocation, involving residents, development companies, and government agencies. The de facto right of public housing tenants is considered by a pragmatic attitude in urban redevelopment in the early years. Second, residential relocation is accompanied by the changes in housing tenure, housing conditions, and the improved built form of planned residential districts. Nevertheless, the social conflict has become intensified recently because the deepening of commodification began to favour property developers by constraining the compensation standard for relocated households.  相似文献