排序方式: 共有306条查询结果,搜索用时 15 毫秒
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讨论了电子地图支持下的控制网设计,将地理环境信息、网优化设计理论、技术设计规程相融合,介绍了“大地网技术设计系统”的基本功能,从技术角度探讨了其软件开发的4个关键技术。此类软件的开发和应用,可以代替测量规范中有关技术设计部分的操作;这也是大地测量生产中软件开发向可视化和支持质量控制发展的方向。 相似文献
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熵理论在确定点位不确定性指标上的应用 总被引:3,自引:0,他引:3
分析了传统点位不确定性指标的局限性,基于信息论中的联合熵和最大熵定理导出了n维随机点熵不确定指标以及落入其内概率的统一公式;提出了以熵误差椭圆与熵误差椭球作为2维、3维GIS中点元的位置不确定性度量指标。提出的熵指标具有唯一确定、不受置信水平选取的主观性影响等特点,适合于度量未知分布的点位不确定性。 相似文献
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BAO XiuzhiCAO HuiZHANG Zuxun Professor School of Information Engineering WTUSM Wuhan China 《地球空间信息科学学报》1998,(1)
This paper presents a new spline called arc spline.It takes two arcsconnecting adjacent points among a sampled series,with known tangental of eachsampled point.The calculation for the parallel.the curve length and the segment-ing point coordinates are simple,thus making map symbol generation simplified.When "arclet" occurs,some special processing must be taken. 相似文献
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利用地震资料进行古地形恢复方法研究及应用 总被引:3,自引:0,他引:3
FENG Yan-zhuang )) SONG Wei-qi ) LIU Shi-you ) ) Nanjing Institute of Geology Palaeontology Chinese Academy of Sciences Nanjing ) Chunliang Oil Production of Shengli Oilfield Company SINOPEC Binzhou ) College of Geo-resources Information China University of Petroleum Dongying 《地层学杂志》2007,(Z2)
在讨论分析地质方法进行古地形恢复方法的基础上,研究了利用地震资料进行古地形恢复的技术方法。针对古地形恢复的几个技术关键问题:等时基准面的选取、压实校正系数的求取及差异构造校正进行讨论分析。综合利用各种基本地质成果,同时结合古构造、现今构造特点等,确定出研究区背景校正经验系数为0.2。就研究的方法对实际研究区目的层段进行了古地形的恢复。 相似文献
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Tectonic Evolution and Petroleum Systems in the Junggar Basin 总被引:1,自引:0,他引:1
WANG Weifeng CHEN Yequan Earth''s Resources Information College University of Petroleum Dongying Shandong Graduate School Chinese Academy of Sciences Beijing Institute of Geochemistry Chinese Academy of Sciences Guiyang Guizhou 《《地质学报》英文版》2004,78(3):667-675
The Junggar basin is located in the northern part of Xinjiang of China. It is part of the Kazakstan plate, surrounded by the Paleozoic folded mountains: the Halaart, Zayier and Chepaizi Mountains in the northwest, the Qingelidi and Karamaili Mountains in the northeast, and the Tianshan Mountains in the south. In different evolution stages, the basin's types are different, and the stratigraphy and deposition are also different. From the Carboniferous to Tertiary the basin has in turn gone through rift basin, collision foreland basin, intraplate depression basin and regenerated foreland basin. Based on an analysis of thermal evolution history and buried history of the source rocks, three major periods of oil generation are found in the basin. According to the characteristics of source rock distribution, evolution, oil-source correlation, structure and multi-phase and mixed pools, the Junggar basin could be divided into 4 composite petroleum systems. Due to the variation in sedimentary facies, difference in 相似文献
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Feedback and Feedforward Optimal Control for Offshore Jacket Platforms 总被引:18,自引:0,他引:18
The optimal control is investigated for linear systems affected by external harmonic disturbance and applied to vibration control systems of offshore steel jacket platforms. The wave-induced force is the dominant load that offshore structures are subjected to, and it can be taken as harmonic excitation for the system. The iineafized Morison equation is employed to estimate the wave loading. The main result concerns the existence and design of a realizable optimal regulator, which is proposed to damp the forced oscillation in an optimal fashion. For demonstration of the effectiveness of the control scheme, the platform performance is investigated for different wave states. The simulations axe based on the tuned mass damper (TMD) and the active mass damper (AMD) control devices. It is demonstrated that the control scheme is useful in reducing the displacement response of jacket-type offshore platforms. 相似文献
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YUAN Wei XU JiYao WU YongFu CHEN HongBin & BIAN JianChun State Key Laboratory of Space Weather Center for Space Science Applied Research Chinese Academy of Sciences Beijing China Graduate University of the Chinese Academy of Sciences Beijing School of Electronic Information Wuhan University Wuhan LAGEO 《中国科学:地球科学(英文版)》2010,(1)
We utilize the temperature profiles with a height resolution of 50-m obtained over the Beijing Observatory in the period between January of 2002 and December of 2002 to study vertical wavenumber spectra of normalized temperature fluctuations in the 1.67-8.02 km and 13.57-19.92 km altitude ranges and compare them with linear saturation model.Results indicate that individual vertical wavenumber spectra reveal a considerable variability in both slope and amplitude.The observed variability is not consistent wit... 相似文献