地学信息图谱图形与属性信息的双向查询与检索方法研究   总被引：4，自引：0，他引：4  

余明  祝国瑞  李春华 《武汉大学学报(信息科学版)》2005,30(4):348-351

探讨了地学信息图谱图形与属性信息的双向查询与检索的实现方法，同时以福建某区域生态环境综合信息图谱为例，在VB、MS Access的环境中，利用GIS组件Mapobjects开发系统，实现了信息图谱图形与属性信息的双向查询与检索的新方法。该工作对福建省生态环境综合信息图谱数据库系统的建立有一定的指导作用，对其他地学图谱研究有一定的参考价值。  相似文献   

忻州市重点水库汛情自动监测预报服务系统          下载免费PDF全文

苏喜福  杨勇  李春华  王建民  马子平 《山西气象》2005,(3):24-26

该系统主要包括雨量监测子系统、水位监测子系统、库区专业预报服务子系统和库区控制中心四部分。系统运行后,库区防汛值班人员坐到值班室就可以通过微机随时了解到水库水位和水库上游面雨量实况,同时还能通过互联网浏览由市气象台专门制作的水库防汛专业气象服务网页,获取库区长、中、短、临近预报、流域面雨量预报和库区附近县(市)的历史资料、最新天气实况资料和天气预报信息。  相似文献   

哈密地区城镇体系发展与布局研究   总被引：3，自引：2，他引：3  

李春华  刘月兰 《干旱区地理》2001,24(1):57-61

从哈密地区城镇体系形成、发展的历史过程及条件入手，分析了城镇发展的现状特征，并从区域经济的角度，提出了优化哈密地区城镇体系结构的具体方案和完善城镇体系空间布局的设想。  相似文献   

机助制图中曲线与平行线的绘制     

李春华 《四川测绘》1997,20(3):124-125

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Michigan basin regional ground water flow discharge to three Great Lakes   总被引：1，自引：1，他引：0  

Hoaglund JR  Huffman GC  Grannemann NG 《Ground water》2002,40(4):390-406

Ground water discharge to the Great Lakes around the Lower Peninsula of Michigan is primarily from recharge in riparian basins and proximal upland areas that are especially important to the northern half of the Lake Michigan shoreline. A steady-state finite-difference model was developed to simulate ground water flow in four regional aquifers in Michigan's Lower Peninsula: the Glaciofluvial, Saginaw, Parma-Bayport, and Marshall aquifers interlayered with the Till/"red beds," Saginaw, and Michigan confining units, respectively. The model domain was laterally bound by a continuous specified-head boundary, formed from lakes Michigan, Huron, St. Clair, and Erie, with the St. Clair and Detroit River connecting channels. The model was developed to quantify regional ground water flow in the aquifer systems using independently determined recharge estimates. According to the flow model, local stream stages and discharges account for 95% of the overall model water budget; only 50% enters the lakes directly from the ground water system. Direct ground water discharge to the Great Lakes' shorelines was calculated at 36 m3/sec, accounting for 5% of the overall model water budget. Lowland areas contribute far less ground water discharge to the Great Lakes than upland areas. The model indicates that Saginaw Bay receives only approximately 1.13 m3/sec ground water; the southern half of the Lake Michigan shoreline receives only approximately 2.83 m3/sec. In contrast, the northern half of the Lake Michigan shoreline receives more than 17 m3/sec from upland areas.  相似文献   

Porphyrin and chlorin distributions in a Late Pliocene lacustrine sediment     

Keely BJ  Harris PG  Popp BN  Hayes JM  Meischner D  Maxwell JR 《Geochimica et cosmochimica acta》1994,58(17):3691-3701

The tetrapyrroles in a highly immature Late Pliocene lacustrine sediment (Willershausen, Germany) show a simple distribution of both chlorin and porphyrin components as the free bases. The major components are C32 desoxophylloerythroaetioporphyrin (DPEP), a C33 bicycloalkano porphyrin, the chlorin analogue of the latter, and desoxophylloerythrin and its chlorin counterpart. The structure of the novel bicycloalkano chlorin was determined using a combination of two-dimensional phase-sensitive COSY NMR and nOe studies. Measurements of delta 13C and other data indicate that DPEP and the bicycloalkano porphyrin were derived from the chlorophyll(s) of photosynthetic organisms utilising a common source of CO2, probably diatoms. The occurrence of DPEP and other minor alkyl porphyrins indicates that the chlorophyll defunctionalisation pathway leading to these components can occur at low temperature and was probably biologically mediated, as was the condensation leading to the fused ring components.  相似文献   

煤体收缩对煤储层绝对渗透率的影响的模型研究     

Levi.  JR 沈襄鹏 《国外煤田地质》1998,(2):26-36

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Survival of microorganisms in smectite clays: implications for Martian exobiology     

Moll DM  Vestal JR 《Icarus》1992,98(2):233-239

Manned exploration of Mars may result in the contamination of that planet with terrestrial microbes, a situation requiring assessment of the survival potential of possible contaminating organisms. In this study, the survival of Bacillius subtilis, Azotobacter chroococcum, and the enteric bacteriophage MS2 was examined in clays representing terrestrial (Wyoming type montmorillonite) or Martian (Fe(3+)-montmorillonite) soils exposed to terrestrial and Martian environmental conditions of temperature and atmospheric pressure and composition, but not to UV flux or oxidizing conditions. Survival of bacteria was determined by standard plate counts and biochemical and physiological measurements over 112 days. Extractable lipid phosphate was used to measure microbial biomass, and the rate of 14C-acetate incorporation into microbial lipids was used to determine physiological activity. MS2 survival was assayed by plaque counts. Both bacterial types survived terrestrial or Martian conditions in Wyoming montmorillonite better than Martian conditions in Fe(3+)-montmorillonite. Decreased survival may have been caused by the lower pH of the Fe(3+)-montmorillonite compared to Wyoming montmorillonite. MS2 survived simulated Mars conditions better than the terrestrial environment, likely due to stabilization of the virus caused by the cold and dry conditions of the simulated Martian environment. The survival of MS2 in the simulated Martian environment is the first published indication that viruses may be able to survive in Martian type soils. This work may have implications for planetary protection for future Mars missions.  相似文献   

Patterns of American rice consumption in 1955 and 1980     

Shortridge JR  Shortridge BG 《Geographical review》1983,73(4):417-429

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1992年加州兰德斯地震时埃默森断层形成的加尔维湖路断层崖的原始…     

Arro.  JR 段瑞清 《地震地质译丛》1995,17(1):56-64

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