地质结构面三维扩展模型研究   总被引：8，自引：0，他引：8  

柴贺军  黄地龙 《水文地质工程地质》1999,26(4):16-17

本文结合水电工程采集岩体结构数据的特点,详细介绍了岩体中结构面在空间上的扩展与延拓方法,即试图利用有限的地质数据建立结构面的拟合函数,从而实现三维地质模型可视化。  相似文献   

Study on feature storage and storage capacity of underground reservoir based on GMS in MHS area of Beijing,China     

Zhe Ma  Zhang Fang  Xinmin Xie  Fuxin Chai  Qiwei Zhang 《Arabian Journal of Geosciences》2015,8(12):10359-10369

  相似文献   

罗氏沼虾体长和体重的一些遗传参数分析   总被引：1，自引：0，他引：1  

陈刚  柴华金  林晓文 《广东海洋大学学报》1996,(1)

报告了罗氏沼虾［Ｍａｃｒｏｂｒａｃｈｉｕｍｒｏｓｅｎｂｅｒｇｉｉ（ＤｅＭａｎ）］体长和体重的一些遗传参数：在体长为１１．０４０±０．１２２（ｃｍ）、体重为４２．２５８±１．７４０（ｇ）时，雄体大于雌体。此时，体长与体重有显著的直线相关（ｒ＝０．９１２，Ｐ＜０．０１）。体重对体长的回归直线为Ｗ＝１３．０５６Ｌ—１０２．０１９，其中雌性为Ｗ＝８．３１５Ｌ—５５．３１１．雄性为Ｗ＝１６．１７ｌＬ—１３４．４０６。罗氏沼虾体长的同类相关系数为０．０４７５，体重的同类相关系数为０．０４７７１６。  相似文献   

IBM-PC/XT—电视及大屏幕显示转换系统     

高胜东  柴肇坤 《成都信息工程学院学报》1989,(3)

本文介绍了使用SONY72时大屏幕投影电视和PAL-D彩色电视机作为IBM-PC/XT微机彩色显示终端转换系统功能,硬件结构及工作原理。对关键技术问题—彩色电视信号编码给出了具体电路和波形。  相似文献   

大连市内部地域结构转型与郊区化   总被引：29，自引：7，他引：22  

曹广忠  柴彦威 《地理科学》1998,18(3):234-241

在回顾大连城市内涪地域结构形成发展的基础上,分析了８０年代以来大连城市土地利用结构的总体变化趋势,并尝试提出了大连市内部地域结构模式图。８０年代期间,大连市内部地域结构已开始由单中心集聚型向多中心集聚与扩散并存型转型,而这种转型是大连市效区化现象在城市地域上的空间反映。  相似文献   

工程VSP模拟和应用问题的研究     

高景华  徐明生 《物探化探计算技术》1998,20(3):241-248

本文对在工程地质勘查中常遇到的一些地质模型进行了ＶＳＰ正演模拟,根据正演模拟结果,讨论了在工程ＶＳＰ勘查中应注意的问题,并对工程ＶＳＰ的应用问题进行了讨论。  相似文献   

Simulated biogeochemical responses to iron enrichments in three high nutrient, low chlorophyll (HNLC) regions   总被引：1，自引：0，他引：1  

Masahiko Fujii  Naoki Yoshie  Yasuhiro Yamanaka  Fei Chai 《Progress in Oceanography》2005,64(2-4):307

To fill temporal gaps in iron-enrichment experimental data and gain further understanding of marine ecosystem responses to iron enrichments, we apply a fifteen-compartment ecosystem model to three iron-enrichment sites, namely SEEDS (the Subarctic Pacific Iron Experiment for Ecosystem Dynamics Study; 48.5°N, 165°E) in the western North Pacific, SOIREE (the Southern Ocean Iron RElease Experiment; 61°S, 140°E) in the Southern Ocean, and IronExII (the second mesoscale iron enrichment experiment; 3.5°S, 104°W) in the Equatorial Pacific. The ecological effects of iron in the model are represented by changing two photosynthetic parameters during the iron-enrichment period. The model results successfully reproduce the observed biogeochemical responses inside and outside the iron patch at each site, such as rapid increases in plankton biomass and biological productivity, and decreases in surface nutrients and pCO₂, inside the patch. However, the modeled timing and magnitude of changes differ among the sites because of differences in both physical environments and plankton species. After the iron enrichment, the diatom productivity is strongly controlled by light at SOIREE and by silicate at IronExII and SEEDS. Light limitation due to self-shading by the phytoplankton is significant during the bloom at all sites. Sensitivity analysis of the model results to duration of the iron enrichment reveals that long-term multiple infusions over more than a week would not be effective at SEEDS because of strong silicate limitation on diatom growth. Sensitivity of the model to water temperature shows that export production is higher at lower temperatures, because of slower recycling of particulate organic carbon. Therefore, the e-ratio (the ratio of export production to primary production) is inversely correlated with temperature, and the relationship can be described with a linear function. Through this study, we conclude that ecosystem modeling is a powerful tool to help design future iron-enrichment experiments and observational plans.  相似文献   

双齿围沙蚕Perinereis aibuhitensis繁殖的生态     

陈灿忠  叶永健 《台湾海峡》1992,11(1):54-60

本文研究了栖息于厦门杏林海区的双齿围沙蚕的繁殖习性等。结果表明,其繁殖期出现在每年2～5月,3月末至4月初为繁殖高峰期;雌雄性比为1∶1.7;卵径为186～214μm;胚胎发育经担轮幼虫、膜内疣足幼虫、疣足幼虫和刚节幼虫而达稚虫。幼虫和幼体的体节(X_1)与体长(Y_1)的回归方程为Y_1=139.77X_1-24.62;幼虫的生长特性为Y_2=323.40X_2~(0.35);幼虫和幼体的实验表明,亚心形扁藻是较好的饵料;疣足幼虫对海水的适宜比重为1.010～1.025;幼虫的生长速度随着投饵密度的增加而加快;在幼虫培养期间应铺以泥沙底质为佳。  相似文献   

闪电数据三维可视化统计分析系统设计与实现     

朱传林  王学良  范宏飞  柴健  余蓉  汪姿荷 《气象科技》2017,45(1):59-63

利用虚拟仿真技术,基于GaeaExplorer三维地理信息系统平台,设计开发了闪电数据三维可视化与统计分析系统。建立了闪电空间数据库,搭建了逼真的三维仿真场景,实现了闪电数据三维精细可视化;同时结合地理信息系统的空间分析能力,实现了闪电数据的管理及空间分析功能,为防雷减灾和决策服务提供了科学手段。应用结果表明:研发的闪电数据三维可视化与统计分析系统具有良好的应用体验,为闪电业务及科研工作提供了坚实的基础平台。  相似文献   

Neighborhood-scale urban form,travel behavior,and CO2 emissions in Beijing: implications for low-carbon urban planning     

Zhilin Liu  Yanwei Chai 《Urban geography》2017,38(3):381-400

With an increasing awareness of global climate change, the effect of urban spatial organization, at both city and neighborhood scales, on urban CO₂ emission reduction has attracted much scholarly and practical attention. Using Beijing as a case study, this article examines the extent to which neighborhood-scale urban form may contribute to reduction of travel-related CO₂ emissions in the context of rapid urbanization and spatial transformation. We derive complete travel-activity records of 1,048 residents from an activity diary survey conducted in 2007. Analysis using structural equation models finds that residents living in a neighborhood with higher land use mix, public transit accessibility, and more pedestrian-friendly street design tend to travel in a “low-carbon” manner and emit less CO₂ in daily travel, even controlling for residential and travel preferences. This article offers empirical evidence that sheds light on debates about policy measures to facilitate China’s transition toward sustainable and low-carbon urban development.  相似文献