THE RISE MODEL OF BUOYANT PLUME LIMITED BY MECHANICAL TURBULENCE

This paper has investigated the rise of bent-over buoyant plume in neutral condition.By means of the combined-effect model proposed at earlier time,authors have deduced a formula of final rise limited by mechanical turbulence and therefore have concluded that the corresponding formula neglecting the accumulated effect of ambient turbulence is only its particular case.By analyzing the function relation of the various affecting factors with the plume rise in the existing equations,it is proved that the formula derived from the combined-effect model is the most reasonable and shows more conformity to the observations.     

Classification and Source Materials of Continental Crust Transformation Series Granitoids in South China

The granitoids of the continental crust transformation series in South China may be divided into threetypes: (1) synorogenic migmatic and magmatic type. (2) anorogenic continental crust anatexis type, and (3)syncollision type. Based on the results of Sr and Nd isotopic determinations, the source material compositionof the three types of granitoids is calculated with crust-mantle binary mixing simulation. The calculations indi-cate that the granitoids of the first type consist of 78.6-89.7% upper crust endmember materials and15.0-10.3% depleted mantle endmember materials, the granitoids of the second type are composed of 63.7%upper crust endmember materials and 36.3% depleted mantle endmember materials, and those of the third type100% upper crust endmember materials. Hence. the source material composition of the granitoids of all thethree types is dominated by upper crust endmembers.     

三元络合物在光度法测钍中的应用

本文综述了近十几年中三元络合物在光度法测钍中的进展及显色剂的应用。     

澜沧—耿马7.6级地震前中小地震活动信息熵和分维的研究

从信息论原理和分形几何学的观点出发,采用多种方法,分析研究1988年澜沧—耿马7.6级地震前地震活动的信息、信息熵和分维的变化特征表明,地震前1—2年内,中、小地震活动的信息熵、缺信量和容量维、信息维出现明显的低值变化过程,反映了地震前兆的减熵、降维特点,从一个侧面反映了大震前,一定区域内中、小地震活动的时空变化从无序向有序的演化过程。     

镇江大力山中,下三叠统沉积特征及环境分析

镇江大力山中、下三叠统青龙组2段和3段发育的瘤体灰岩属盆地边缘斜坡环境,杂乱瘤体灰岩横向相变为盆地边缘斜坡滑塌重力流成因(深水)的泥晶砾屑灰岩;蠕粒灰岩则为台地前缘斜坡的浅水沉积环境,与浅水重力流的砾屑泥晶灰岩共生.     

油气资源遥感勘查新方法

地下深处的油气藏中的烃类物质,在压力梯度下会向地表产生微渗漏,导致地表物质产生一系列理化异常,在地表形成吸附烃异常、红层退色、粘土化、碳酸盐化、放射性异常和地植物异常等标志。根据这些地表标志的地物波谱特征,选择出油气资源遥感勘查的最佳工作波段,在此基础上,以机载遥感信息为主,以星载遥感信息为辅,以地表地球化学、地植物学、地面遥感勘查作为验证手段,最终施行多元信息复合分析,可达到寻找油气藏的目的。     

夹皮沟地区金矿地球化学异常模式及深部成矿预测

在总结夹皮沟地区金矿勘查地球化学特征的基础上,提出了该区金矿地球化学异常模式.通过坑道岩石地球化学测量成果,进行因子分析、点群分析及趋势分析.综合元素垂直分劳、分劳序列的计算、Ag、Au剩余异常等多种信息对三道岔金矿床深部进行了预测,并取得良好的效果.     

M17树脂分离富集原子荧光测定岩矿中痕量碲

本文研究了不同种类树脂对Te的吸附能力,提出了在3mol/L HCl介质中,用M_(17)二甲胺树脂吸附,然后用水洗脱的新途径,使Te有效且无污染地得到分离和富集,实现了原子荧光测定地质试样中ppb级痕量Te。经地矿部标准参考样GSR7-12考察,分析结果与推荐值相符。     

Mixture of populations

A simple example simulating a mixture of two normal populations results in some important observations, nonnormality and nonsymmetry of the mixture conditional pdf, nonlinearity of the conditional mean as a function of the conditioning data, heteroscedasticity of the conditional variance and its nonmonotonicity as a function of distance of the unknown to the conditioning data. A comparison of the mixture statistics with those predicted by traditional models ignoring the mixture reveals the inadequacy and inappropriateness of these traditional approaches. A mixture of two multivariate normal populations is illustrated through the analytical expressions of its conditional distribution and moments.