Reproducibility of a regional geological map derived from geochemical maps, using data mining techniques: with application to Chungbuk province of Korea   总被引：1，自引：0，他引：1  

SangGi Hwang  QuocPhi Nguyen  PyeongKoo Lee 《Environmental Geology》2005,48(4-5):569-578

Interpolated geochemical maps contain problems of sample catchments and vacant sample areas. However, the resemblance of these maps with regional geological maps implies that there are strong correlations between them. A conceptual model of the geological units from multivariate chemical elements is constructed by decision tree technique. The reproducibility of the geological map with the conceptual model is about 80% in the Chungbuk province map of Korea. Statistical uncertainties indicate that rock units could be predicted reasonably well by decision tree if the geological map polygon is big enough. Misinterpreted points are due to interpolation problems between samples from adjacent rock units and from different sample catchments. In the Chungbuk example, the latter is less significant. The size of the map polygon is one of the most critical factors, and a polygon size greater than 50 km² is reliable for such analyses for the Chungbuk example. Combined lithologies in a single mapping unit are not critically affected by decision tree prediction.  相似文献   

高空探测资料气球漂移的计算方法   总被引：1，自引：0，他引：1       下载免费PDF全文

李伟 王志文谢庄  刘凤琴徐磊 涂满红 《应用气象学报》2005,16(6):835-840

随着数值模式的不断发展，探空气球的漂移偏差越来越不可忽视。为了提高高空观测数据的质量，减小在探测过程中由于气球漂移造成探测资料在空间上的误差，中国气象局提出一套探空、测风报的空间、时间扩充编码方案。该文从探空雷达探测系统、探测原理分析出发，介绍了该方案计算方法，并用个例说明方案的使用方法及业务应用前景。  相似文献   

Interaction of calcium dioleate collector colloids with calcite and fluorite surfaces as revealed by AFM force measurements and molecular dynamics simulation     

Keqing Fa  Anh V. Nguyen  Jan D. Miller 《International Journal of Mineral Processing》2006

Spherical calcium dioleate particles (∼ 10 μm in diameter) were used as AFM (atomic force microscope) probes to measure interaction forces of the collector colloid with calcite and fluorite surfaces. The attractive AFM force between the calcium dioleate sphere and the fluorite surface is strong and has a longer range than the DLVO (Derjaguin–Landau–Verwey–Overbeek) prediction. The repulsive AFM force between the calcium dioleate sphere and the fluorite surface does not agree with the DLVO prediction. Consideration of non-DLVO forces, including the attractive hydrophobic force, was necessary to explain the experimental results. The non-DLVO interactions considered were justified by the different interfacial water structures at fluorite– and calcite–water interfaces as revealed by the numerical computation experiments using molecular dynamics simulation. The density of interfacial water at the fluorite surface is low and the fluorite surface is not strongly wetted by water molecules. In contrast to the water at the fluorite surface, water molecules at the calcite surface form tightly packed monolayer structures and the calcite surface is extensively hydrated by water molecules. The interfacial water structure agrees with the AFM force measurements and the flotation recovery data. The strong attraction between the calcium dioleate colloid and the fluorite surface, and the moderately wetted fluorite surface by water molecules explain the better flotation response of fluorite with the oleate collector colloid.  相似文献   

Novel Extreme Learning Machine-Multi-Verse Optimization Model for Predicting Peak Particle Velocity Induced by Mine Blasting     

Zhang  Xiliang  Nguyen  Hoang  Choi  Yosoon  Bui  Xuan-Nam  Zhou  Jian 《Natural Resources Research》2021,30(6):4735-4751

Natural Resources Research - Peak particle velocity (PPV) is an important criterion for assessing the risk level of ground vibration induced by mine blasting. Based on this criterion, many efforts...  相似文献   

Comment on ‘The residence time of aerosols and SO2 in the long-range transport over the Ocean’, by Ito et al.     

B. Bonsang  B. C. Nguyen  G. Lambert 《Journal of Atmospheric Chemistry》1987,5(3):367-369

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河北大湾锌矿中硫锰矿与闪锌矿的成因关系     

魏绮英  涂勘 《矿物学报》1987,(1)

本文研究了产于河北大湾锌矿床中的硫锰矿,探讨了硫锰矿与闪锌矿的成因关系。由实验结果而认为大湾硫锰矿是从深色高锰闪锌矿中出溶而成的。  相似文献   

Derivation of the Pearson type (PT) III distribution by using the principle of maximum entropy (POME) — Comment     

Huynh Ngoc Phien  Van-Thanh-Van Nguyen 《Journal of Hydrology》1987,90(3-4):351-355

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大气边界层的数值模式   总被引：3，自引：4，他引：3  

吴辉碇  张兴旺  屠伟铭  朱宗申 《气象学报》1984,42(3):290-300

从大气边界层温湿特征的模拟,讨论模式的设计和处理。模式计算所得位温,混合比垂直廓线和混合层厚度等随时间变化基本反映实际大气边界层的一些特点。并从地气之间热量收支、土壤热传导方程出发计算地面温度日变化。利用Clarke的Wangara资料计算了24小时内它们的变化,并与观测值进行比较。本文还对温湿预报方程的数值解的稳定性进行了讨论。  相似文献   

Morphology and distribution of the three epiphytic dinoflagellate species Coolia monotis,C. tropicalis,and C. canariensis (Ostreopsidaceae,Gonyaulacales, Dinophyceae) from Vietnamese coastal waters     

The V. Ho  Lam N. Nguyen 《Ocean Science Journal》2014,49(3):211-221

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我国东北地区冬季气温变化的东亚冬季风背景          下载免费PDF全文

刘实  隋波  涂钢  冯喜媛 《应用气象学报》2014,25(1):11-21

利用中国气象局国家气象信息中心1961—2011年我国东北地区72个气象站月平均气温资料及NCEP/NCAR月平均海平面气压、500 hPa高度场及200 hPa与850 hPa风场再分析资料,对东亚冬季风强度与我国东北地区冬季气温序列经去除线性趋势处理后的变化特征进行对比分析。结果表明:去除线性趋势后,东亚冬季风强度与我国东北地区冬季气温序列的相关系数为-0.69,较原始序列更为显著;两者变化的阶段性较为同步,我国东北地区冬季气温于2004年已转入低温阶段,这与东亚冬季风同时转为偏强阶段关系密切;两者均存在20年左右的长周期,同样存在相近的阶段性短周期;我国东北地区冬季气温的增温变化趋势在1986年前后的增暖性气候突变中起重要作用。东亚冬季风强度与我国东北地区冬季气温年代际信号的相关系数达-0.86,较原始序列年代际相关更为显著;两者的年代际变化存在21.5年左右的共同准周期。东亚冬季风强度与我国东北地区冬季气温的年际变化序列存在4年左右的共同准周期。我国东北地区冬季气温的年际和年代际异常存在与东亚冬季风相关联的200 hPa东亚急流、500 hPa东亚大槽、乌拉尔高压、850 hPa风场、地面西伯利亚高压等的异常背景。  相似文献