基于J2EE的移动定位服务研究   总被引：6，自引：0，他引：6  

陈能成  龚健雅  朱欣焰  刘琳 《武汉大学学报(信息科学版)》2004,29(1):48-51

阐述了基于J2EE的移动定位服务 (MLS)的体系结构 ,介绍了适于MLS的GIS应用服务器和信息设备地图可视化表达的关键技术 ,给出了GeoSurf的WAP和J2ME的两种解决方案 ,并阐述了其应用前景  相似文献   

Thermodynamic conditions of framework grain dissolution of clastic rocks and its application in Kela 2 gas field   总被引：2，自引：2，他引：2  

LAI Xingyun  YU Bingsong  CHEN Junyuan  CHEN Xiaolin  LIU Jianqing  MEI Mingxiang  JING Weiguang & CHENG Suhua School of Earth Sciences  Mineral Resources  China University of Geosciences  Beijing  China  Key Laboratory of Lithospheric Tectonics  Deep-level Process  Exploration of Ministry of Education  Beijing  China 《中国科学D辑(英文版)》2005,48(1):21-31

Feldspar and clastic debris are the most important constituent framework grains of sedimentary clastic rocks and their chemical dissolution plays an essential role in the formation and evolution of the secondary pore in the reservoir rocks. On the basis of thermodynamic phase equilibrium, this study investigates the chemical equilibrium relationships between fluid and various plagioclase and K-feldspar in diagenesis of the sediments, particularly, the impact of temperature and fluid compositions (pH, activity of K+, Na+, Ca2+ and so on) on precipitation and dissolution equilibria of feldspars. Feldspar is extremely easily dissolved in the acid pore water with a low salinity when temperature decreases. The dissolution of anorthite end-member of plagioclase is related to the Ca content of the mineral and the fluid, higher Ca either in the mineral or in the fluid, easier dissolution of the feldspar. Moreover, the dissolution of albite end-member of plagioclase is related to Na of both the mineral and fluid,  相似文献   

Taxonomic composition and seasonality of diatoms in three Dinaric karstic lakes in Croatia     

Nenad Jasprica  Dubravka Hafner 《Limnologica》2005,35(4):304-319

The composition and temporal distribution of planktonic diatoms were studied in three small shallow karstic lakes – Modro Oko, Desne, and Kuti – throughout the seasons in 1994, 1995, 1997, and 1998. Physico-chemical parameters did not differ among the three lakes, except for NO₃ concentrations. Altogether, 137 diatom taxa within 41 genera were found in all three lakes combined. The highest number of taxa belonged to the genera Surirella (13), Navicula (12), andCymbella (9). Most taxa were tychoplanktonic, with true panktonic taxa contributing only 14% of the total. Despite their physical-chemical similarity, the lakes showed differences in the structure and dynamics of their diatom communities. Blooms occurred at different times in each of the lakes, and community similarity (Jaccard index) among all three was low (17.6–29.1%). The highest mean values of surface diatom abundance in Modro Oko (2199 cells L⁻¹), Desne (7900 cells L⁻¹), and Kuti (20690 cells L⁻¹) were not significantly different. Margalef's species richness index did not differ either among the lakes or seasonally. Only five diatom taxa in quantitative samples, and 22 taxa in net-samples, were common to all lakes. The most frequent diatoms were Cyclotella striata (56–93%), Fragilaria ulna (50–67%), and Asterionella formosa (27–83%). The most abundant taxa in Modro Oko, Desne, and Kuti were, respectively, Cymbella sp. 1 (402 cells L⁻¹), Cyclotella striata (3000 cells L⁻¹) and Asterionella formosa (20690 cells L⁻¹). Eighteen taxa were recorded for the first time in Croatia: Amphora commutata, Caloneis amphisbaena var. subsalina, C. silicula var. peisonis, Campylodiscus echeneis, Coscinodiscus lacustris, Denticula elegans, Gyrosigma acuminatum var. lacustre, G. distortum var. parkeri, G. fasciola, Navicula menisculus var. menisculus, N. pusilla, N. helensis, Stauroneis parvula var. prominula, Staurosira construens f. subsalina, Stephanodiscus sp. 1, Surirella gracilis, S. ovalis, and S. striatula. The genus Stephanodiscus was recorded for the first time in Croatia.  相似文献   

The southern Norwegian Sea during the last 45 ka: hydrographical reorganizations under changing ice‐sheet dynamics     

《第四纪科学杂志》2017,32(7):908-922

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Runoff response of a small agricultural basin in the argentine Pampas considering connectivity aspects     

María Guadalupe Ares  Marcelo Varni  Celio Chagas 《水文研究》2020,34(14):3102-3119

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基于ArcGIS平台与质检软件的地理国情普查快速质量控制方法     

宋旭东 《测绘与空间地理信息》2016,(4):91-94

"信息化质检平台IGCES"及"地理国情普查成果质检软件"是某省地理国情普查采用的主要人机交互质量控制软件。该类软件使用复杂,某些检查项耗时长,难以满足快速化质检的要求,本文结合地理国情普查具体实施要求,提出"人工详查、基于ArcGIS 10.1平台与质检软件概查"的快速质检方法,为国家战略规划制定、空间规划管理、区域政策制定、灾害预警、科学研究等领域的地理国情监测提供有力的数据保障。  相似文献   

基于ArcGIS Add-in的交互式DLG质量检查平台搭建研究     

金丽华  钱枫  王晓波  朱李忠 《测绘与空间地理信息》2016,(3):152-154

DLG作为基础地理信息的核心数据,质量直接影响其在各个领域内的应用,为此,DLG质量检查尤为重要。基于现有检查软件的质检工作大多将检查和编辑分离成两个独立部分,使得错误信息的查看和修改不便。因此,基于ArcGIS Add-in研发了交互式DLG质量检查平台,将质检和编辑无缝衔接,实现随查随改的高效质量过程控制。  相似文献   

齐齐哈尔市地理国情分析与表达     

刘艳芳  方佳琳  焦利民  彭金金 《测绘与空间地理信息》2016,(3):5-8

以齐齐哈尔市为例,利用地理国情普查数据与统计年鉴数据,构建自然地表指数、地理区位指数、生态覆被指数,对齐齐哈尔市各县、区的地理国情进行综合分析和地图表达。结果表明,齐齐哈尔市的总体条件较好,但区域差异较大,自然地表条件与地理区位条件均以中部的齐齐哈尔市辖区为优,而生态覆被条件则以北部和西部地区为优。  相似文献   

地理世情监测标准建设初探     

张月  桂德竹 《测绘与空间地理信息》2016,(2):60-63

探讨地理世情监测标准规范建设的需求与意义,归纳梳理国内外相关标准规范建设的现状,分析目前我国地理世情监测标准规范建设存在的不足,提出相关建议,以推动地理世情监测工作的开展。  相似文献   

基于MapGIS的地理国情普查研究与应用     

张洪升  张建新  王艳华 《测绘与空间地理信息》2016,(1):119-121

随着第一次全国地理国情普查工作的全面开展,出现了众多地理国情信息数据处理软件,数据的采集和制作也遇到了各种各样的问题,我们利用MapGIS平台对软件的内部模块和功能进行了有效的利用,并得到了很好的应用效果。  相似文献