西宁市两种辐射观测仪器资料的对比分析

本文通过对西宁站2002年、2003年两种不同型号的自动辐射观测资料中的总辐射、净辐射各时月平均值、日总量值、日最大值的对比分析,初步分析了两种仪器误差产生的原因。结果表明两种仪器受温度的影响较大,仪器的密封是造成两种仪器误差的主要原因,两种仪器安装装置的不同是造成两者净辐射差异的主要原因之一。     

从HRPT中分离TIP数据

介绍一种从ＨＲＰＴ中分离ＴＩＰ数据的方法,并给出设计思想,部分电路、时序及程序流程图。     

GPS在地壳形变和板块运动监测中的应用

简要介绍了GPS在现代板块构造运动中的应用及其进展:GPS对于地球参考框架的建立和维持发挥着重要的作用;大量地壳运动监测网的建立使得GPS成为监测地壳运动强有力的工具;全球性、全天候的GPS卫星测高将在现代板块构造运动的监测中发挥重要作用;高精度的IGS产品为国际动力学服务提供坚实的数据基础。     

地图数据缩编更新中的道路自动选取研究

总结道路选取的研究现状,分析在道路的缩编更新过程中,道路要素选取需要考虑的要素指标。介绍一种道路选取方法,综合考虑道路的等级、长度、网眼面积、区域道路密度、是否是悬挂链等几何、语义和拓扑信息,模拟人类在缩编更新时的思维过程,实现道路的自动选取,并进行试验,验证方法的有效性。     

γCas的光谱变化

γ Cas是一颗Be/x-ray双星.紫台于1986年冬用新安装在60cm反光镜上的Marly-Nanjing非球面光(?)摄谱仪对其作了光谱观测.本文简要介绍了观测期间Ha、HeIλ5875与HeIλ6678发射线轮廓的特征及其待值宽度在天与天之间,数小时之间变化.     

中国与埃达克质岩有关的矿床分布、找矿方向及找矿方法刍议

根据埃达克质岩的特征、时空分布及有关矿产的产出情况,将中国与埃达克质岩有关的矿床分为产于造山带和产于陆块内两大类,若干成矿带(区)和次一级的成矿亚带.与前者相关的有古亚洲洋、秦祁昆洋、环太平洋和新特提斯成矿带;与后者相关的有中国东部、青藏高原和藏东南-川西南-滇西北成矿(区)带.埃达克岩与成矿作用的密切关系开辟了一条围绕埃达克岩来找矿的新思路.根据中国的现状和未来发展的需求,从立足于找大矿和世界级大矿出发,认为我国寻找Cu,Au,Mo和Ag等的找矿方向应当从战略目标、近期目标和远期目标3个不同层次来考虑,希望加强在古亚洲洋造山带和冈底斯造山带的找矿工作.在评述了早期和现行的找矿方法后,初步拟定了在埃达克岩出露地区的找矿思路,建议将埃达克岩作为找矿勘查的前提和标志之一来考虑.     

微机在分析含水层参数中的应用——通用标准曲线法

一般的标准曲线法仅能适用于无边界的单孔抽水试验。本文通过公式推导,黄金分割法选优,在VICTOR—9000微机上实现了通用标准曲线法计算含水层参数。 本法应用范围广。单主孔或多主孔,抽水或注水、承压水或潜水,凡是能通过映射变为无限问题的一切边界问题均可使用。 本法可打印出原始数据、计算结果并拷贝相应的匹配图形。 本法的特点是保证计算结果的一致性,克服了人为随意性;克服了直线法必须满足r~2/4at<0.01的局限性。不论抽水时间的长短,主孔、观测孔与边界距离的远近均可使用。 由于采用了黄金分割法选优,循环次数较少、计算速度快捷、拷贝图形方便。     

中国云南哀牢山含海蓝宝石伟晶岩的起源和成岩模拟实验研究

The Ailaoshan aquamarine-bearing pegmatites are associated with Proterozoic metamorphic rocks in the southern portion of the Ailaoshan fault-folded complex.The gem-bearing pegmatite mineralization zones of the region occur in areas generally consistent with the regional tectonic trend.The pegmatites are found in metamorphic rocks,migmatites and in the inner/outer contact zones of gneissoid granites. The Rb-Sr isochron drawn for the pegmatites is 26～31 Ma,(i.e.in Himalayan).The homogenization temperatures of melt and liquid inclusions in minerals vary from 185 to 920℃,which are comparable to the inclusions observed in banded migmatites and ptygmatic quartz veins in the surrounding metamorphic rocks. The mineralization fluids of the pegmatite were rich in HCO_3 and CO_2,and their compositional assemblages are comparable to metamorphic fluids.Results of H,O,C,Si etc.isotopic analyses and REE,and Be analyses indicates that the sources of mineralization components that formed the pegmatites are closely associated with metamorphic fluids and the enclosing metamorphic rocks. A pegmatite structure simulation experiment was conducted at high temperature and pressure(840℃and 1,500×105Pa.),with various metamorphic rock samples in a water-rich and volatile-rich environment.When the liquidus was reached,the temperature was gradually decreased at the rate of 5～10℃/day over a time period of three months.SEM energy-dispersive spectrum analyses were performed on the experimental products.A series of pegmatoid textures were observed including zonal texture,megacryst texture,drusy cavities,crystal druses,and vesicular texture along with more than ten types of minerals including plagioclase,microcline,quartz and biotite.Different metamorphic rock melts generated different mineral assemblages.Experiment results revealed that the partial melting of metamorphic rocks could form melts similar to pegmatite magmas. Based upon the geological characteristics,geochemistry,and pegmatite texture simulation experimental results,it is concluded that the mineralization components of Ailaoshan aquamarine-bearing pegmatites came from metamorphic rocks.The petrogenetic model for the origin of pegmatites is related to ultrametamorphism and metamorphic anatexis.