应用"极值剔除"和"逐步消空"法建立太原机场11月份辐射大雾预报指标集          下载免费PDF全文

管翔  栗毅 《山西气象》2004,(2):8-10

本文介绍了利用“极值剔除”和“逐步消空”方法建立太原机场11月份辐射大雾预报指标集的具体过程，并对得出的预报指标进行回报检验，以证实其在业务中的切实可行性。  相似文献   

南秦岭十里坪锑矿床成矿时代及成因的初步研究   总被引：1，自引：1，他引：1  

谢才富  熊成云  胡宁  李六权  常海亮  李劲松  管魁敏 《矿床地质》2004,23(4):473-483

十里坪锑矿床受赵川陆缘隆_滑构造的主滑脱拆离带的控制。矿体呈脉状赋存于韧_脆性主滑脱带上部的脆性次级断层_节理中,矿石类型主要为萤石石英辉锑矿型。围岩为太古宙_元古宙变质岩系,围岩蚀变弱。成矿流体属H2O_CO2_NaCl体系,流体包裹体盐度w(NaCleq)为3.6%～11.3%,均一温度为109～232℃,形成压力大致为800×105Pa。硫、铅同位素研究表明,矿质主要来源于变火山岩围岩;氢、氧同位素显示,成矿流体以大气降水为主,初步将该矿床定为变质岩源就地式大气降水热液矿床。矿石中萤石Sm_Nd等时线年龄为(392±24)Ma,与南秦岭北部晚古生代拗陷区热水喷流_沉积成矿时代相一致,它们都形成于秦岭微板块泥盆纪非造山裂解阶段。  相似文献   

青铜文物腐蚀过程中的次生矿物   总被引：3，自引：0，他引：3  

陈璋如  刘月妙  范光  孙淑云  李延祥 《矿物岩石》2004,24(1):10-13

产于不同环境不同地方的青铜文物经矿相显微镜观察、电子探针成分分析和X射线衍射研究表明，在青铜文物腐蚀层中观察到次生矿物——赤铜矿、孔雀石、蓝铜矿、白铅矿和锡石。由上述矿物组成的腐蚀层在青铜器表面形成保护层。腐蚀层细分为红色赤铜矿层、绿色碳酸盐矿物层和黄色锡石层组成，其厚度小于1mm。青铜合金在潮湿条件下的腐蚀比在干旱条件下要严重，另外青铜合金是适用于作高放废物地质处置系统中的废物罐的候选材质。  相似文献   

Tracing the protolith, UHP metamorphism, and exhumation ages of orthogneiss from the SW Sulu terrane (eastern China): SHRIMP U–Pb dating of mineral inclusion-bearing zircons     

Fulai Liu  Zhiqin Xu  Huaimin Xue 《Lithos》2004,78(4):411-429

Orthogneisses are the major country rocks hosting eclogites in the Sulu UHP terrane, eastern China. All of the analyzed orthogneiss cores from the main drilling hole of the Chinese Continental Scientific Drilling Project (CCSD-MH) have similar major and trace element compositions and a granite protolith. These rocks have relatively high LREE/HREE ratios, strong negative Eu anomalies (Eu/Eu*=0.20–0.39), and negative Ba anomalies (Ba/Ba*=0.25–0.64). Coesite and coesite-bearing UHP mineral assemblages are common inclusions in zircons separated from orthogneiss, paragneiss, amphibolite, and (retrograded) eclogite of the CCSD-MH. This suggests that the eclogite, together with its country rocks, experienced in situ ultrahigh-pressure (UHP) metamorphism. Laser Raman spectroscopy and cathodoluminescence (CL) images show that zircons from the orthogneisses are zoned and that they have distinct mineral inclusions in the different zones. Most zircons retain early magmatic cores with abundant low-pressure mineral inclusions, which are mantled with metamorphic zircon-containing inclusions of coesite and other UHP minerals. The outermost rims on these grains contain low-pressure mineral inclusions, such as quartz and albite. SHRIMP U–Pb dating of the zoned zircons gives three discrete and meaningful groups of ages: Proterozoic ages for the protolith, 227±2 Ma for the coesite-bearing mantles, and 209±3 Ma for the amphibolite facies retrograde rims. The widespread occurrence of UHP mineral inclusions in zircons from the Sulu metamorphic belt dated at about 227 Ma suggests that voluminous continental crust experienced late Triassic subduction to depths of at least 120 km and perhaps more than 200 km. Eighteen million years later, the terrane was rapidly exhumed to midcrustal levels, and the UHP rocks were overprinted by amphibolite facies metamorphism. The exhumation rate deduced from the zircon age data and previously obtained metamorphic P–T data is estimated to be 5.6–11.0 km/Ma. Such rapid exhumation of the Sulu UHP terrane may be due to the buoyancy forces produced by subduction of low-density continental material into the deep mantle.  相似文献   

储层岩石电性特征的逾渗网络模型研究(英文)     

王克文  孙建孟  关继腾  苏远大 《应用地球物理》2005,2(4):223-229

建立能够反映储层孔隙结构、流体特征的逾 渗网络模型,通过数值模拟研究了储层孔隙尺寸、 孔隙形状、连通性、微孔隙的发育状况等对I-Sw曲 线影响的定性规律,研究了地层水矿化度对岩石电 阻率的影响。分析讨论了不同因素对电阻率影响的 相对强度。最后,通过曲线拟合定量地研究了不同 因素对I-Sw曲线的影响规律。研究表明,在上述影 响因素中连通性和微孔隙对I-Sw曲线的影响很大, 其它因素的影响强度较小。地层水矿化度对岩石电 阻率绝对值的影响很大。“非阿尔奇”现象普遍存在, 在低渗透(低连通性)储层岩石中更为明显。  相似文献   

Photosynthesis-transpiration coupling model at canopy scale in terrestrial ecosystem   总被引：1，自引：0，他引：1  

REN Chuanyou  YU Guirui  WANG Qiufeng  Guan Dexin 《中国科学D辑(英文版)》2005,48(Z1)

At the hypothesis of big leaf, an ecosystem photosynthesis-transpiration coupling cycle model was established by the scaled SMPT-SB model from single leaf to canopy, and model parameterization methods were discussed. Through simulating the canopy light distribution, canopy internal conductance to CO2 can be scaled from single leaf to canopy by integrating to canopy using the relationship between single internal conductance and photosynthetic photon flux density. Using the data observed by eddy covariance method from the Changbai Mountains site of ChinaFLUX, the application of the model at the canopy scale was examined. Under no water stress, the simulated net ecosystem photosynthesis rate fitted with the observed data very well, the slope and R2 of the line regression equation of the observed and simulated values were 0.7977 and 0.8892, respectively (n = 752), and average absolute error was 3.78 μmol CO2 m-2s-1; the slope, R2 and average absolute error of transpiration rate were 0.7314, 0.4355 and 1.60mmol H2O m-2 s-1, respectively (n = 752). The relationship between canopy photosynthesis,transpiration and external environmental conditions was discussed by treating the canopy as a whole and neglecting the comprehensive feedback mechanism within canopy, and it was noted that the precipitation course affected the transpiration rate simulation badly. Compared to the models based on eco-physiological processes, the SMPT-SB model was simple and easy to be used. And it can be used as a basic carbon and water coupling model of soil-plant-atmosphere continuum.  相似文献   

Study on the multi-sources of ore-forming materials and ore-forming fluids in the Huize lead-zinc ore deposit     

张振亮  黄智龙管涛严再飞  高德荣 《中国地球化学学报》2005,24(3):243-252

TheHuizelarge sizedPb ZndepositinYunnan ProvinceislocatedinthecenteroftheSichuan Yun nan GuizhouPb Zn Agpolymetalmineralizationzone(SYGPb ZnMMD)inwesternYangtzePlateandis oneofthefamousPb Zn GebasesinChina(Wang Jiangzhenetal.,2003;WangXiaochunetal.,2000).Thisdeposit,whichischaracterizedbylarge scale(Pb+Znmetallicreservesarehigherthan5mil liontons),highPb+Zngrade(thePb+Zngradesof mostoresare25%-35%),highabundanceofuseful associatedelements(Ag,Ge,Cd,Ga,etc.)and someimportantbreakt…  相似文献   

指数平滑技术在斜坡位移预测中的应用     

王洪兴  王冠  罗文强 《地质科技情报》2005,24(Z1):196-198

应用趋势型数据指数平滑模型预测了链子崖危岩体监测点GA的位移量.根据其观测数据呈线性趋势的特点,选取趋势型二次指数平滑的线性预测公式和合适的平滑常数值进行了计算预测.预测结果表明位移预测值与实际观测值之间的误差很小,说明该模型可很好地应用于斜坡变形位移的预测.  相似文献   

Simulation of earthquake-induced hazards of falling exterior non-structural components and its application to emergency shelter design     

Zhen Xu  Xinzheng Lu  Hong Guan  Yuan Tian  Aizhu Ren 《Natural Hazards》2016,80(2):935-950

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Reconstruction of the springtime East Asian Subtropical Jet and Western Pacific pattern from a millennial-length Taiwanese tree-ring chronology     

W. E. Wright  B. T. Guan  Y.-H. Tseng  E. R. Cook  K.-Y. Wei  S.-T. Chang 《Climate Dynamics》2015,44(5-6):1645-1659

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