分光光度法中过量显色剂隐色的研究——Ⅳ.铍试剂Ⅲ三阶导数光度法测定岩石中痕量铍

本文在EDTA和甘露醇存在下以Sn为共沉淀剂,沉淀富集痕量Be,分离大量Fe、Al和Ti等干扰元素。痕量Be测的定采用草酸存在下铍试剂Ⅲ(隐色)三阶导数光度法。显色体系灵敏度高,检出限为1ng Be/ml,且允许共存离子量较大。方法经GSD系列标样和硅酸盐岩石试样中痕量Be测定验证,其结果与推荐值(或原结果)相符。方法精密度好,对于含Be0.0091％硅酸盐岩石测定其RSD(n=6)为1.66％。     

GPS定位中对流层折射率随机模型的研究

分析了ＧＰＳ相对定位中对流层折射的特点，概述了目前所采用的几种确定性参数对流层折射估计和随机过程参数对流层折射估计方法。根据实测数据处理结果，分析比较了几种确定性模型和随机过程模型对ＧＰＳ相对定位精度的改善作用。结果表明：对流层折射的多参数确定性模型和随机参数模型对基线分量的重复性，特别是高程分量的重复性有明显改善；在大多数情况下，尤以随机参数模型为佳，其垂直分量的重复性精度较单参数模型可提高一倍左右。     

Astrometric detection of Earth-like planets with OSI

The Orbiting Stellar Interferometer (OSI) is a space-based astrometric interferometer designed primarily for wide-angle astrometry. OSI is potentially capable of achieving astrometric accuracies of 1as in narrow angle (1°) astrometry. This paper discusses the implications for astrometric planet detection, specifically the detection of Earth-like planets around nearby stars. OSI has the potential to detect a limited number of planetary systems with Earths, if a number of technical problems are solved.     

塔里木盆地中部地震转换波测深及其解释

沿塔里木盆地中部的库车—塔中—塔南测线,首次进行了地震转换波测深。探测结果表明,本区岩石圈具有明显的层状－块体结构,地壳厚度４０～５０ｋｍ,隆起区约为４０ｋｍ,凹陷区约为５０ｋｍ。上地壳的厚度在盆地中部明显减薄,中地壳波速相对偏高（ＶＰ＝６．４～６．５ｋｍ／ｓ）,下地壳上部普遍存在低速薄层,结晶地壳的速度高于周围青藏高原和天山地区的波速,波速结构表明地壳具有陆壳性质,地壳内存在具有逆冲性质的深部断裂。综合解释认为,自新生代以来,在印度－欧亚板块边界的强大挤压力作用下,岩石圈内包括结晶基底面和莫霍面在内的各深部界面（岩层）的准同步挠曲变形和地壳刚性块体沿深部逆冲断裂的调整运动,是塔里木盆地岩石圈中主要的深部动力学过程     

Tectono-thermal evolution of middle-south section of the Da Hinggan Mountains

The tectonic settings of the different stages of the magmatic activity in the middle-south section of the Da Hinggan Mts. are analyzed through measuring the isotopic ages of the Mesozoic volcano-plutonic rocks from this area, and thus the tectono-magmatic evolution series are consequently determined as the initial mantle upwelling marked by the Late Triassic invasion of basic-ultrabasic rocks containing mantle-source enclaves, middle-upper crust extension marked by intrusion of the Early-Middle Jurassic diobase dike swarms, dramatic ruption of the Late Jurassic trachitic volcanic rocks, the Early Cretaceous nonorogenic alkalic-subalkalic granite invasion and the formation of the basic dike swarms and basalts. It is thus inferred that the uprise of the Da Hinggan Mts. in the Mesozoic is closely reiated to the upwelling of the deep magma in the mantle upwarping settings. Project supported by the National Natural Science Foundation of China (Grant No. 249472143).     

强对流天气的雷达回波分析与预报

利用７１１转达做短时预报的关键是地雷达回波正确判别。根据观测资料及短时预报经验,并依据本地的特殊地形及气候特征,着重分析了强对流雷达回波的形状特征并引进了能量天气学的方法,以得出具有可操作性简明判据。     

中生代地球系统与核—幔边界动力学研究进展

本文介绍了９０年以来地球物理学在地球磁场方面的研究成果,揭示了２００－１００Ｍａ全球低的地球磁场古强度;１２４－８３Ｍａ低的极性反转频率以及１７０－１１０Ｍａ近乎停滞的真极移。     

内蒙古甘珠尔庙变质核杂岩

本文讨论了出露在大兴安岭主峰穹状复背斜核部的变质核杂岩。从岩石组合、变质温压条件、变形特征角度阐明了变质核杂岩的结构。从变质核杂岩各层之间的产状关系进一步探讨了变质核杂岩隆升时间以及与大兴安岭隆升的关系。最后通过核部侵位的超镁铁-镁铁质岩探讨了变质核杂岩隆升的深部背景。     

泌阳凹陷核桃园组湖相碳酸盐岩系孢粉相及烃源岩评价

孢粉相是反映一定沉积物以及成岩作用环境的显微沉积有机质组合。对我国河南泌阳凹陷下第三系核桃园组核三上段至核二段湖相碳酸盐岩系孢粉相进行了详细研究。基于有机质组分的鉴定和统计将碳酸盐岩系划分为五个孢粉相带;并利用孢粉相结合有机质成熟度地化指标,对其生油潜能进行了评价。