数字图书馆的公共性反思     

黄磊  陈慧 《国土资源信息化》2008,(4):3-5,14

本文在把握数字图书馆的基本特征前提下,运用公共性理论分析研究数字图书馆的公共性,通过分析数字图书馆的公共性特征及影响因素,发现许多非技术性的因素影响数字图书馆的进程,甚至违背了数字图书馆的服务宗旨,理想与现实之间存在着很大差距。  相似文献   

Construction of a Metagenomic DNA Library of Sponge Symbionts and Screening of Antibacterial Metabolites   总被引：1，自引：0，他引：1  

CHEN Juan ZHU Tianjiao LI Dehai CUI Chengbin FANG Yuchun LIU Hongbing LIU Peipei GU Qianqun ZHU Weiming 《中国海洋大学学报(英文版)》2006,5(2):119-122

To study the bioactive metabolites produced by sponge-derived uncultured symbionts, a metagenomic DNA library of the symbionts of sponge Gelliodes gracilis was constructed. The average size of DNA inserts in the library was 20 kb. This library was screened for antibiotic activity using paper disc assaying. Two clones displayed the antibacterial activity against Micrococcus tetragenus. The metabolites of these two clones were analyzed through HPLC. The result showed that their metabolites were quite different from those of the host E. coli DH5α and the host containing vector pHZ132. This study may present a new approach to exploring bioactive metabolites of sponge symbionts.  相似文献   

基于WebGL的航道数据组织与三维可视化方法     

辛全波  秦柳  范俊甫  毕金强 《测绘地理信息》2022,47(1):81-85

针对Web端进行航道构建与三维可视化时遇到的海量数据组织困难、即时显示效率低的问题,提出了一种多维度数据索引构建方法,利用多层次网格索引将空间分布特征和时空关联关系索引到数据中,实现了海量水深数据的快速增量入库和高效检索;提出了一种基于边界约束的航道地形模型构建方法,利用alpha-shape算法提取自适应边界,并对D...  相似文献   

土方直剪试验数据采集管理系统的设计与实践          下载免费PDF全文

郑现磊  贾向新  张西坤  靳益民  高淑芳  李雪峰  苏艳科 《探矿工程》2015,42(11):50-53

直剪试验被广泛应用于工程勘察中用来测定土的抗剪强度。针对直剪试验中,试验持续时间长、产生的测量数据多等特点,设计了一种基于VB6.0与USB7660多功能数据采集模块的数据采集与管理系统。详细介绍了系统的设计原理和实现方法,并对系统各部分的设计思路及实现过程进行了详细说明。实验表明,该系统基本能够满足在岩土工程勘察土方直剪试验过程中对测量数据采集与分析的要求。  相似文献   

Derivation of an urban materials spectral library through emittance and reflectance spectroscopy     

《ISPRS Journal of Photogrammetry and Remote Sensing》2014

Recent advances in thermal infrared remote sensing include the increased availability of airborne hyperspectral imagers (such as the Hyperspectral Thermal Emission Spectrometer, HyTES, or the Telops HyperCam and the Specim aisaOWL), and it is planned that an increased number spectral bands in the long-wave infrared (LWIR) region will soon be measured from space at reasonably high spatial resolution (by imagers such as HyspIRI). Detailed LWIR emissivity spectra are required to best interpret the observations from such systems. This includes the highly heterogeneous urban environment, whose construction materials are not yet particularly well represented in spectral libraries. Here, we present a new online spectral library of urban construction materials including LWIR emissivity spectra of 74 samples of impervious surfaces derived using measurements made by a portable Fourier Transform InfraRed (FTIR) spectrometer. FTIR emissivity measurements need to be carefully made, else they are prone to a series of errors relating to instrumental setup and radiometric calibration, which here relies on external blackbody sources. The performance of the laboratory-based emissivity measurement approach applied here, that in future can also be deployed in the field (e.g. to examine urban materials in situ), is evaluated herein. Our spectral library also contains matching short-wave (VIS–SWIR) reflectance spectra observed for each urban sample. This allows us to examine which characteristic (LWIR and) spectral signatures may in future best allow for the identification and discrimination of the various urban construction materials, that often overlap with respect to their chemical/mineralogical constituents. Hyperspectral or even strongly multi-spectral LWIR information appears especially useful, given that many urban materials are composed of minerals exhibiting notable reststrahlen/absorption effects in this spectral region. The final spectra and interpretations are included in the London Urban Micromet data Archive (LUMA; http://LondonClimate.info/LUMA/SLUM.html).  相似文献   

标准地址共享服务平台的设计与实现     

郭丽  祝士杰 《测绘与空间地理信息》2014,(10):175-177

在对标准地址库系统进行设计的基础上,详细阐述了标准地址共享服务平台——＂一库三平台＂的系统设计思路。建立了杭州市标准地址共享服务平台,即＂一库三平台＂,具体为：一个数据库——标准地址库,三个服务平台——标准地址云服务平台、标准地址监控管理平台、标准地址应用服务平台;该系统为杭州市各级政府各业务部门地理信息应用提供了统一的标准基础信息数据和标准地址库服务;同时,利用地址匹配与业务关联采集技术,实现业务信息资源与标准地址库的有机关联,实现了业务信息数据海量存储与应用,为政府及社会公众在工作和生活中提供翔实的检索、定位信息和云平台服务。  相似文献   

甘肃省明长城资源调查专题地图技术方案探讨     

张江霞 《测绘与空间地理信息》2011,34(4):216-218

介绍了甘肃省明长城资源调查中重要图件——专题图的制作方案和流程。基于GIS软件的优势,探讨利用空间基础资料结合专题数据制作专题地图的一种新思路,为甘肃省境内明长城的保护、研究与管理提供可靠依据。  相似文献   

应用MAPGIS地形库管理整合1∶200000区域化探数据     

高艳芳  王会强  杨长江 《物探化探计算技术》2011,33(4):446-449,349

利用1∶200 000地球化学数据,从整个成矿地球化学环境的角度出发,最大限度地开发、挖掘三十九种化学元素中每个元素以及元素组合所蕴含的矿化信息,为成矿远景区预测提供更加翔实的地球化学依据,是地球化学工作者的研究任务之一。MAPGIS功能强大,其地图库管理模块为多幅1∶200 000地球化学异常图的拼接提供了技术支持。这里论述了1∶200 000地球化学数据的特征和MAPGIS的地图库管理的功能,并记述了在实际工作中应用MAPGIS的地图库管理对多幅1∶200 000地球化学异常图的拼接,实现了对1∶200 000地球化学数据的另一种应用方式。  相似文献   

SYSTEM FOR AUTOMATIC GENERALIZATION OF TOPOGRAPHIC MAPS     

YAN Hao-wen LI Zhi-lin AI Ting-hua 《中国地理科学(英文版)》2006,16(2):165-170

1INTRODUCTION Map generalization may be defined as a procedure that generatessmallerscalemapsfromlargerscaleonesusing variousappropriateoperations (e.g.selection,combina- tion, displacement, simplification, etc.) under definite conditions (includingmap scale, purpose, etc.). The au- tomation of the generalization process has been a dream of cartographers for decades. For it is an indispensable wayto construct map databases from large-scale maps to small-scale ones, which can decrease repet…  相似文献   

Construction of cDNA Library from Intestine, Mesentery and Coelomocyte of Apostichopusjaponicus Selenka Infected with ~brio sp. and a Preliminary Analysis of Immunity-Related Genes     

LIU Hongzhan  ZHENG Fengrongt  SUN Xiuqin  CAI Yimei 《青岛海洋大学学报(英文版)》2012,(2):187-196

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