扰动与基本带状环流非线性相互作用的实验研究

本文用转盘实验的方法,研究了均质正压流体运动中扰动与基本带状环流的非线性相互作用。着重考察了两类典型初始扰动场——即迭加在基流上的槽状扰动和多闭合涡旋中心扰动结构的演变过程。发现:非线性相互作用过程是以波动形式表现的。两类初始扰动场各自经历不同的演变过程,并趋向于不同的平衡态。槽状扰动结构有利于基流对扰动动能的吸收,流场最终趋向于轴对称带状环流状态,而且纬向波数越大,吸收过程越明显。多闭合涡心结构不利于基流对扰动动能的吸收。基流与扰动在动能随时间的变化上表现出准周期性振荡。实验结果与旋转适应过程理论有很好的一致性。     

On the Chemical Evolution of Upper Mantle of the Early Earth—An Experimental Study on Melting of the Silicate Phase in Jilin Chondrite at High Pressures

Relatively old ages of chondrites(normally around 4.5Ga)suggest that their parent bodies did not experience any mely-fractionation under high temperature and high pressure conditions pertaining to the interior of terrestrial plaets.Therefore,it is reasonable to take chondrites as starting materials in the study of the chemical evolution of the early earth.The sillicate phase in the Jilin chondrite (H5)was chosen for this purpose because it possesses a chemical composition similar to that of the primitive mantle.The melting experiment was carried out at 20-30 k bar and has rsulted in a product which contains1-5% melts in addition to solid cryustal phase.The chemical composition of the melt phases and the partitioning of various elements between the coexisting silicate melts are geochemically similar to those of anatectic rocks on the earth.This can thus serve as the basis for discussing the chemical evolution of the early upper mantle.     

Crustal Growth Rate of the North China Platform：a Method of Estimating Mass Equilibrium between Crust and Mantle

The following equation is proposed in this paper to estimate the crustal growth rate of the North China Platform on the basis of mass equilibrium between the crust and the mantle:

面向网络的海量影像空间数据在线分发技术

阐述了基于J2EE的海量空间数据在线分发系统原理和关键技术，给出了海量影像空间数据在线浏览发布的实例。     

基于JSP/JavaBean的Web GIS实现技术

研究了如何利用JSP／JavaBean技术更好地实现WebGIS系统，提出了基于JSP／JavaBean的WebGIS实现模型，并以应用实例加以说明。     

Web GIS组件方法研究

在分析WebGIS二次开发需求的基础上，提出了基于JavaBean的WebGIS组件概念，并详细阐述其特征、体系结构和空间数据组织，结合实例Internet GIS-GeoSurfV4.0介绍了系统的设计与实现以及二次开发的方法与比较。     

论空间信息与移动通信的集成应用

分析了空间信息技术与移动通信集成的必要性和可行性，讨论了技术集成所面临的关键技术，提出了空间信息与移动通信集成的体系结构，归纳总结了其应用领域和市场前景。     

Time and tectonic setting of the Xixiang Group: Constraints from zircon U-Pb geochronology and geochemistry

The present paper reports the research development in the timing and tectonic setting of the Xixiang Group, northwestern margin of the Yangtze block. U-Pb concordant ages of (946 ± 18) Ma and (904±18) Ma of zircons were obtained from the upper and lower units of the Xixiang volcanic succession, respectively. Elemental and Nd isotope characteristics show that the volcanic suite has the affinities of arc island magmatism as well as an evolution trend of tectonic setting from front-arc to back-arc. The volcanic rocks suffered from some extensive post-stage tectono-thermal events, resulting in the resetting of their Rb-Sr isotopic system.     

表生介质中铜的赋存相态研究——以敖格道仁诺尔铜多金属矿(化)区为例

表生介质中铜的赋存相态对其表生异常的发育有重要意义。通过对敖格道仁诺尔铜与金属的矿化区内土壤及湖各湖积物中铜的七种赋存相态的分析研究，认为在土壤剖面上的不同层位之间，铜的赋存相态存在差异，而这种差异又随近矿地段和矿体上方土壤空间位置的不同有所变化。铜的这种赋存相态特征受研究区地理景观条件、土壤结构类型、土壤环境的化学物理参数及铜的表生地球化学性质等内外因素制约的。对这些制约因素的深入研究是表生异常形成机制及其评价研究的基础。     

GeoStar在北京绿化隔离带规划发展信息系统中的应用

概述了北京市区绿化隔离地区规划发展信息系统建设的背景，介绍了系统的总体构成，第一期建设的内容，系统功能模块与实现。通过本 建设，表明国产GIS软件GeoStar在二维矢量，三维表现，DEM，影像以及与MIS结合的综合应用中具有较强的优势。