基于GML的地理信息发布系统的安全防护研究     

张翰林  王青山  邹永初  寇静行 《测绘学院学报》2009,(4)

GML是构建地理信息发布系统的一种工具,在当前广泛采用的以Browser/Server方式开发的3层体系结构的地理信息发布系统中得到了极大的应用。但这种以GML为应用策略的地理信息发布系统存在着一定的安全隐患。此处分析了这种安全隐患,把主动防御的思想应用到地理信息发布系统的安全防护框架中,分别说明了安全防护、入侵检测、攻击响应、事故恢复等子系统在地理信息发布系统安全防护中所起的作用。  相似文献   

空间位置驱动的地理信息系统软件集成     

王珂珂  张立朝  寇静行  王青山  潘贞 《测绘通报》2009,(12)

研究一种简单有效的地理信息系统软件集成模式。通过深入研究扩展数据模型、统一方法协同以及空间位置驱动等三种地理信息系统软件集成模式,分别从内部实现机制、实现途径、难易程度等方面进行分析和对比,认为空间位置驱动的地理信息系统软件集成方案具有简单有效、易于编程实现等优点,是目前较为可行的集成模式。并对该方案进行了验证和测试。  相似文献   

Identification of Prorocentrum minimum and Takayama pulchella by fluorescence in situ hybridization through epifluorescence microscopy and flow cytometry     

HOU Jianjun          LAI Hongyan  HUANG Bangqin  CHEN Jixin College of Fisheries  Huazhong Agricultural University  Wuhan  China College of Life Sciences  Hubei Normal University  Huangshi  China State Key Laboratory of Marine Environmental Science  Environmental Science Research Center  Xiamen University  Xiamen  China Key Laboratory of Freshwater Fish Germplasm Resources  Biotechnology  Yangtse River Fisheries Research Institute  Jinzhou  China State Key La... 《海洋学报(英文版)》2009,28(2)

Partial rDNA sequences of Prorocentrum minimum and Takayama pulchella were amplified, cloned and sequenced, and these sequence data were deposited in the GenBank. Eight oligonucleotide probes (DNA probes) were designed based on the sequence analysis. The probes were employed to detect and identify P. minimum and T. pulchella in unialgal and mixed algal samples with a fluorescence in situ hybridization method using flow cytometry. Epifluorescence micrographs showed that these specific probes labeled with flu...  相似文献   

裂缝暂堵转向重复压裂技术   总被引：1，自引：0，他引：1  

时玉燕  刘晓燕  赵伟  陈爱峰  常国省  陈言美 《海洋地质译丛》2009,(2):60-64

针对中原油田以往的压裂工艺中单纯采用延伸原有裂缝的常规重复压裂,裂缝所控制的泄油区内的原油采出程度高,但泄油区外的大量剩余油动用程度较低的特点,研制了应用化学暂堵控制剂使流体在地层中发生转向,压裂液进入高应力区或新裂缝层,促使新缝的产生和支撑剂的铺置变化。通过11井次现场应用,累计增油7 162 t。转向压裂技术作为低渗油藏一项重点的配套工艺,更进一步改善了油田的整体开发效果。  相似文献   

Application of extension theory in risk zoning of debris flow in Beijing     

BAI Liping    WANG Yeyao  SUN Jiali  GONG Bin .College of Water Sciences  Beijing Normal University  Beijing  China .Chinese Research Academy of Environmental Sciences  Beijing  China 《东北亚地学研究》2009,12(1):40-45,56

The occurrence of debris flow is affected by many factors. Risk zoning of debris flow plays a vital role in the early-warning and prediction of abrupt geological hazards, and exploration of new method is needed in the early-warning and prediction of geological hazards. The extension theory is a new method to solve contradiction matters. Based on extension theory, AHP and GIS, the risk zoning model of debris flow was established in this paper. The result of this research provides a new way in the risk zoning, early-warning and prediction of debris flow  相似文献   

翡翠的矿物组成对其质量的影响     

朱薇珊  黄作良  寇大明 《国土资源》2000,(2)

翡翠的质量主要取决于它的颜色和结构,就颜色而言,主要取决于其中的矿物组成和化学成分。翡翠主要由辉石族矿物、闪石族矿物、长石族矿物等组成。其中辉石族的矿物如硬玉、霓石、钠铬辉石、钙铁辉石,它们的存在和数量的多少及化学成分的变化对翡翠的质量影响很大。另外,闪石族矿物使翡翠的颜色偏暗,部分飘蓝花,直接影响翡翠的质量。  相似文献   

Numerical analysis on water exchange and its response to the coastal engineering in the Yueqing Bay in China   总被引：2，自引：0，他引：2  

LI Jia  YAO Yanming  LI Xiaoyan  ZHANG Hongwei 《海洋学报(英文版)》2008,27(Z1):60-73

On the basis of a numerical model of tidal current using Delft3D, the distribution of the semi - exchange time of water was simula- ted in the Yueqing Bay here. The result showed that the semi - exchange time was about more than 6 d in the bay end, and about 1～2 d in the bay mouth. Besides, based on the calculation of the semi - exchange time before and after the Xuanmen Dam pro- ject, a comparison between them was further carried out. And the same work was also done with the recent reclamation projects in the Yueqing Bay as well. The results showed that the change in semi - exchange time caused by the Xuanmen Dam project was a- bout 6 d increase near the dam and 4.5 d increase at the bay end. And it was about 5 d increase at the bay end and 1 d increase at the mouth of the bay caused by the recent reclamation projects.  相似文献   

Depth inversion in coastal water based on SAR image of waves   总被引：1，自引：0，他引：1  

范开国  黄韦艮  贺明霞  傅斌  张彪  陈小燕 《中国海洋湖沼学报》2008,26(4):434-439

Wave-number spectrum technique is proposed to retrieve coastal water depths by means of Synthetic Aperture Radar （SAR） image of waves. Based on the general dispersion relation of ocean waves the wavelength changes of a surface wave over varying water depths can be derived from SAR. Approaching the analysis of SAR images of waves and using the general dispersion relation of ocean waves, this indirect technique of remote sensing bathymetry has been applied to a coastal region of Xiapu in Fujian Province, China. Results show that this technique is suitable for the coastal waters especially for the near-shore regions with variable water depths.  相似文献   

Effect of sea spray on the numerical simulation of super typhoon ‘Ewiniar’   总被引：1，自引：0，他引：1  

Jing Zheng  Jianfang Fei  Tao Du  Yuan Wang  Xiaoyan Cui  Xiaogang Huang  Qiming Li 《中国海洋大学学报(英文版)》2008,7(4):362-372

To study the potential effect of sea spray on the evolution of typhoons,two kinds of sea spray flux parameterizationschemes developed by Andreas (2005) and Andreas and Wang (2006) and Fairall et al.(1994) respectively are incorporated into theregional atmospheric Mesoscale Model version 3.6 (MM5V3) of Pennsylvania State University/National Center for AtmosphericResearch (PSU/NCAR) and the coupled atmosphere-sea spray modeling system is applied to simulate a Western Pacific super ty-phoon Ewiniar in 2006.The simulation results demonstrate that sea spray can lead to a significant increase in heat fluxes at theair-sea interface and the simulated typhoon's intensity.Compared with the results without sea spray,the minimum sea level pressurereduces about 8hPa after taking account of sea spray by Fairall et al.'s parameterization (1994) and about 5hPa by Andreas' (2005)and Andreas and Wang's (2006) parameterization at the end of the model integration,while the maximum 10m wind speed increasesabout 17% and 15% on average,respectively,through the entire simulation time period.Taking sea spray into account also causessignificant changes in Tropical Cyclone (TC) structure due to an enhancement of water vapor and heat transferred from the sea sur-face to the air; therefore,the center structure of the typhoon becomes more clearly defined and the wind speed around the typhooneye is stronger in numerical experiments.The simulations show that different sea spray flux parameterizations make different modifications to the TC structure.  相似文献   

浅谈枣庄市市中区基准地价成果分析及应用          下载免费PDF全文

王惠  刘晓燕 《山东国土资源》2008,24(7)

城区土地级别和基准地价是城市土地利用情况的反映,它客观地揭示了城区内不同区段土地使用价值及变化规律,是政府宏观调控土地市场、科学合理配置土地资产的有效手段。随着枣庄市市中区经济建设发展和城市规划的实施,城市基础设施不断完善,带动了城市房地产市场健康发展和土地使用权价格稳定上涨。该文通过对枣庄市市中区新一轮基准地价更新成果的详细分析,探讨了基准地价更新成果在城市经济发展中的应用。  相似文献