西秦岭天水尹道寺中生代酸性火山岩锆石U-Pb定年和元素地球化学研究

对天水尹道寺酸性火山岩进行了LA-ICPMS锆石U-Pb定年、全岩主量和微量元素分析.结果表明,本区酸性火岩熔岩均为流纹岩,SiO2、Na2O K2O含量高,TiO2含量低,主体为亚碱性系列,轻稀土高度富集,Eu负异常明显.微量元素原始地幔标准化分配模式及洋中脊玄武岩标准化分配模式分别与大陆板内火山岩或大陆板内花岗岩的分配模式一致,Ba、Sr、P、Ti显著亏损.锆石U-Pb同位素定年揭示了流纹岩的岩浆结晶年龄为印支末期(211Ma).流纹岩具有富集放射性Pb同位素的特点,其源区可能为北秦岭基底岩石.依据稀土元素和微量元素分配模式对比研究,认为流纹岩浆为地壳下部部分熔融的产物.源区物质可能为下元古界秦岭岩群中的黑云角闪斜长片麻岩,源区的残留物主体可能为斜长石,含有角闪石,岩浆演化过程中存在少量的碱性长石和黑云母的分离结晶.印支末期秦岭地区处于由陆内碰撞造山阶段开始向深部地幔调整和岩石圈减薄阶段转变,特殊的构造背景使得陆内挤压、剪切走滑和推覆构造较为发育,西秦岭尹道寺地区特定的构造背景与断裂构造的结合,形成了该地区独特的流纹岩浆喷发.     

局域网共享虚拟传真机的实现

介绍了一种利用电话线和Modem配合传真软件建立局域网内共享的“虚拟传真机”的方法。     

基于GIS的城市地价监测系统设计

建立城市地价监测体系,对完善我国从土地使用制度改革,建立起以市场机制形成土地价格的制度体系具有重要作用.以GIS为工作平台,从城市地价动态监测点建立的标准出发,以有利于工作数据的采集为目的,采用Oracle数据库建立了一套具有数据采集、图形编辑、地价发布、地价预警等多功能的城市地价动态监测体系.     

Testing the Ability of Numerical Model to Simulate Climate and Its Change With 4D-EOF Analysis

The four-dimensional empirical orthogonal function (4D-EOF), which in reality is a simple combination of three-dimensional EOF (3D-EOF) and extended EOF (EEOF), is put forward in this paper to test the ability of numerical model to simulate climate and its change. The 4D-E0F analysis is able to reveal not only the horizontal characteristic pattern of analyzed variable, and its corresponding annual and inter-annual variations, but also the vertical structural characteristics. The method suggested is then used to analyze the monthly mean 100-, 500-, 70G-, and 1000-hPa geopotential height fields (4941 grids and grid spacing 60 km) and their anomaly fields in 1989-1998 simulated by the MM5V3 from the RMIP (Regional Climate Model Inter-comparison Project for East Asia)-II, as well as their counterparts (used as the observed fields) from the NCEP/NCAR re-analysis dataset in the same period. The ability of MM5V3 in simulating East Asian climate and its change is tested by comparing the 4D-EOF analysis results of the simulated and observed datasets. The comparative analyzed results show that the horizontal pattern of the first eigenvector of the observed monthly mean geopotential height fields and its vertical equivalent barotropic feature were well simulated; the simulations of the first two eigenvectors of the observed monthly mean geopotential height anomaly fields were also successful for their horizontal abnormal distributions and significant equivalent barotropic features in the vertical were well reproduced; and furthermore, the observed characteristics, such as the variation with height, the annual and inter-annual variations of the monthly mean geopotential height/anomaly fields were also well reflected in the simulation. Therefore, the 4D-EOF is able to comprehensively test numerical model's ability of simulating the climate and its change, and the simulation ability of MM5V3 for the climate and its change in East Asia in the 1990s was satisfactory.     

大兴安岭南段晚中生代侵入岩时空分布及主脊与东坡岩体特征对比

通过岩相学、地球化学、锆石U-Pb年代学对位于大兴安岭主脊上的马勒根坝岩体、朝阳沟岩体和大兴安岭东坡区域的野猪沟岩体、布敦化岩体的4个不同花岗岩岩体的岩石类型、主量和微量元素特征、年代学及构造背景进行对比分析,讨论了研究区在晚侏罗世—早白垩世的岩浆活动及地质背景。LA-ICP-MS锆石U-Pb年龄显示:主脊朝阳沟岩体和东坡布敦化岩体年龄分别为(154±1) Ma和(154.1±1.6) Ma,属于晚侏罗世岩体,主脊马勒根坝岩体和东坡野猪沟岩体年龄分别为(144.62±0.74) Ma和(140.2±2.7) Ma,属于早白垩世岩体。岩相学和地球化学特征显示:主脊岩体为高钾钙碱性-准铝质-过铝质花岗岩岩体,东坡岩体为钙碱性-高钾钙碱性-准铝质-弱过铝质TTG型岩体;主脊比东坡岩体更加亏损Ba、Nb、Sr、P、Ti、Eu元素,为高分异I型花岗岩,东坡岩体为正常的I型花岗岩。结合区域地质资料分析,认为在晚侏罗世—早白垩世伊泽奈崎板块NNW向俯冲和蒙古—鄂霍次克洋闭合共同作用于大兴安岭南段地区,在大兴安岭主脊形成断裂带,导致幔源岩浆上涌底侵下地壳而形成沿断裂带分布的花岗岩体;主脊处于碰撞向伸展环境过渡的时期,东坡区域此时应处于俯冲时期。     

小冬克玛底和海螺沟冰川的物质平衡(英)

Studying the mass balance on the Xiao Dongkemadi Glacier and Hailuogou Glacier shows that the mass balance variation of continent type glacier in the interior of the plateau is in the same phase with that of the marine type glacier in the southeast margin of the plateau. However, the mass balance in the continent type glacier is always positive, and the marine type glacier is in large negative mass balance. The continent type glacier is slow to climate change and the marine glacier is sensitive to climate change.     

震源孕育的追赶模式

本文提出了一种一维震源孕育模型。用数学物理方法分析了该模型在地震前的孕育过程和各种物理量的变化规律,提出了震源孕育的追赶模式。追赶模式对纵波速度、地壳运动的前兆异常可作出解释,说明该模式是研究地震前兆的一种可能的力学基础.     

Pollen assemblages and their environmental implications in the Qaidam Basin,NW China

The Qaidam Basin is one of the most sensitive areas to climate change in China, owing to its unique geographical position and ecological condition. In this study, 32 surface‐soil pollen samples were collected to reveal the relationship between modern pollen assemblages, vegetation and precipitation in the eastern region of the Qaidam Basin. The results show that Chenopodiaceae (3.8–87%, average 48%), Artemisia (1.7–64.2%, average 17.5%) and Ephedra (0–90%, average 16.3%) are the dominant pollen types in all samples, and that different pollen assemblages correspond to different vegetation types. DCA and CCA of major pollen types demonstrate that precipitation is an important factor in the control of the distribution of vegetation in the study area. The content and concentration of the three major pollen types (Artemisia, Chenopodiaceae and Ephedra) change with the mean annual precipitation, and the optimum mean annual precipitation for Ephedra, Chenopodiaceae and Artemisia is <80, 80–200 and >160 mm, respectively. Correlation analysis between the variation in grain size of the three major pollen types and the main environmental variables shows that the grain size of the three pollen types is positively correlated with precipitation in the Qaidam Basin. The results confirm that precipitation is the most important environmental factor in the Qaidam Basin, and that it has an important effect on pollen grain size in the study area.     

广西山地风能资源开发利用可行性分析——以大容山为例

利用大容山自动观测站2004年8月～2006年7月气象观测资料和容县气象站1958～2006年7月测风资料,对大容山的风能资源各参数进行了详细计算和分析,并结合预选风电场的地形地貌、交通运输、联网条件、环境保护等状况对大容山风能资源开发利用进行了可行性分析评价.结果表明：大容山年平均风速为7.2m/s,年平均风功率密度为390.8W/m^2,其风能资源丰富,且交通运输、联网、工程地质等条件较好,可选择在坡度较小的山头或山腰建设风电场,预选风电场可布置750kW的风机45台,总装机容量约为34MW.     

基于UC/OS-Ⅱ的UCGUI和LWIP资源整合的研究

介绍了针对实时内核UC/OS-Ⅱ的资源扩展,主要是UCGUI和LWIP的资源整合,探讨了两者在UC/OS-Ⅱ中的移植方法,丰富了UC/OS-Ⅱ的功能.