用简单模式法对高纬电离层电场的进一步研究

本文采用的是有二区场向电流但无电导率时角变化的简单模式。文章通过模式计算,系统讨论了在恒稳条件下二区场向电流强度及位相和Hall与Pederson电导率在极光带升高等因素对高纬电场分布的影响。模式说明,二区场向电流的存在使二区电流圈以内电场加强,其外电场大大削弱。这种加强与削弱作用与二区电流的强度与位相均有关。Hall电导率在极光区升高会加强上述作用,Pederson电导率的升高则对其有所削弱。一般说来,极盖区外电场分布的位相与极盖区边界的驱动势不同,一、二区场向电流的位相与驱动势也有差异。这些现象都是场向电流与电导率共同影响的结果。以下结果初步解释了近年来的某些观测现象。最后,本文对简单模式法的应用及今后的某些方向作了探讨。     

最小二乘法求解三类卫星重力梯度边值问题的研究

研究了最小二乘法求解3类卫星重力梯度边值问题的理论和方法，给出了3类梯度观测值{Гzz}、{Гxz、Гyz}和{Гxx-Гyy,2Гxy}对应边值问题解的核函数严密表达式。模拟试算结果表明，最小二乘法求解的卫星重力梯度积分公式用于恢复地球重力场是有效而严密的。     

鄂尔多斯盆地塔巴庙地区上古生界气藏高产地质因素分析

鄂尔多斯盆地塔巴庙地区上古生界气藏为一套致密低渗砂岩储层,产层分布在下石盒子组、山西组及太原组,其中测试高产层集中分布在盒3段及盒2段。这里在对产层特征进行研究的基础上,通过对各地质参数与产能的相关性研究,对控制高产的主要地质因素进行了分析讨论,结果表明,优质的储层条件是产层获得高产的基础,产层含气丰度及地层能量是控制高产的主要地质因素。产层电阻率的大小能反映出含气丰度大小,依据电阻率分布来评价高产层的平面分布,并提出了下一步主要勘探开发目标区。     

新疆艾比湖流域水文特征分析

本文根据艾比湖流域各水文站历年水文统计资料及近几年来的实际水文调查,通过流域概况、气温、蒸发、降水、冰川、径流年内和年际变化、泥沙、冰情、水质等方面的分析,研究艾比湖流域的水文特征变化规律。     

低水合氯化镁吸水过程中水蒸气分压计算

对低水合氯化镁的吸水过程进行了初步的探讨,并对低水合氯化镁吸水过程中与水蒸气的平衡分压进行了计算。     

关于城市三维景观建模的探讨

本文以乌鲁木齐市三维景观建模项目为依托,阐述了利用数字摄影测量系统,获取城市基础地理信息,结合GIS、虚拟现实、仿真等系统软件,建立城市三维景观的方法；探讨了在城市三维景观制作过程中存在的关键技术问题。     

TiO2 nanoparticle trails in garnet: implications of inclusion pressure-induced microcracks and spontaneous metamorphic-reaction healing during exhumation

A new mechanism of cleaving-healing of garnet in metamorphic rocks during exhumation is reported. Almandine garnet with submicron multiple-phase inclusions characteristic of the GRAIL reaction, garnet + rutile = kyanite + ilmenite + low-quartz, was found by analytical electron microscopy to have non-epitaxial rutile nanoparticles distributed along internal {110} microcrack trails at the acute corner of submicron multiple-phase inclusions defined by the intersecting (110) and (011) mould surfaces. Such garnet microcracks were formed during lithostatic decompression due to a relatively high compressibility of quartz in the inclusion pockets and stress concentration at the acute corner. Spontaneous healing with accompanied formation of non-epitaxial rutile nanoparticles was activated predominantly via the GRAIL reaction due to high surface tension at the tip of microcracks and, to a lesser extent, decreasing lithostatic pressure or increasing inclusion pressure upon exhumation. This new mechanism of microcracking and healing involves stress build up, fracture propagation, mineral reaction, transport of elements to the reaction site and lowering of reaction boundaries by capillarity effect, all under the influence of thermodynamic and kinetic factors at the submicron-scale. Thus, TiO₂ nanoparticle trails in garnet provide additional information on the P–T path and may shed light on exhumation rates/mechanisms and metamorphic reactions/processes. Careful scrutiny of host minerals on the submicron scale is required to tell whether there are other metamorphic-reaction facilitated healing processes being overlooked by inappropriate techniques or being obliterated by the predominant healing processes of fluid infiltration and resorption zoning.     

铜陵狮子山铜金矿田成矿流体成分及稳定同位素地球化学

Shizishan ore-field is a nonferrous and noble metal ore-field which is most rich in copper and gold.There are many types of fluid inclusions in minerals of the deposits.The homogeneous temperatures and the salinities of the fluid inclusions in main mineralization stages have wide ranges,while the different types of the fluid inclusions existed together and their homogeneous temperatures are almost identical in the same mineralization stage,which indicates that the ore-forming process has great relation with the fluid boiling.The gas and liquid chemical compositions and the carbon,hydrogen and oxygen isotopic compositions of the fluid inclusions show that the ore-forming fluids of copper-gold deposits have the same characteristics and evolution tendency,which reflects that the ore-forming material mainly came from the magmatism.The stratigraphic component and the meteoric water may mix in ore- forming fluids in the later mineralization stages.Furthermore,with the fall of the ore-forming temperature the ratios of water and rock decreased.The characteristics of chemical composition and carbon isotopic composition of fluid inclusions indicate that CH4 may play an important role for separating copper and gold in the ore-forming process.     

基于AVHRR﹑MODIS和MVRIS数据的辐射雾变化检测与分析

以过境时间不同的NOAA-16/AVHRR、NOAA-17/AVHRR、FY1-D/MVRIS、TERRA/MODIS和AQUA/MODIS五种遥感影像数据组成一组序列影像,对发生在湖北省2005年2月4日的辐射雾进行了一次变化检测与分析.经地面验证,序列影像数据在雾变化检测的研究方面具有很大的潜力,检测结果动态地显示了该次大雾的形成﹑发展﹑稳定﹑消散的过程.将检测结果与该区域的DEM和水系矢量图结合分析发现,二者在辐射雾的变化发展过程中起着非常重要的作用.     

基于AVHRR、MODIS和MVRIS数据的辐射雾变化检测与分析

以过境时间不同的NOAA-16／AVHRR、NOAA-17／AVHRR、FY1-D／MVRIS、TERRA／MODIS和AQUA／MODIS五种遥感影像数据组成一组序列影像，对发生在湖北省2005年2月4日的辐射雾进行了一次变化检测与分析。经地面验证，序列影像数据在雾变化检测的研究方面具有很大的潜力，检测结果动态地显示了该次大雾的形成、发展、稳定、消散的过程。将检测结果与该区域的DEM和水系矢量图结合分析发现，二者在辐射雾的变化发展过程中起着非常重要的作用。