Energy transfer among Pb, Ce and Mn in fluorescent calcite from Kuerle, Xinjiang, China

Natural calcite from Kuerle, Xinjiang, China, shows orange-red fluorescence when exposed to short-wave ultraviolet (UV) light (Hg 253.7 nm). Photoluminescence (PL) emission and excitation spectra of the calcite are observed at room temperature in detail. The PL emission spectrum under 208 nm excitation consists of three bands: two UV bands at 325 and 355 nm and an orange-red band at 620 nm. The three bands are ascribed to Pb²⁺, Ce³⁺ and Mn²⁺, respectively, as activators. The Pb²⁺ excitation band is observed at 243 nm, and the Ce³⁺ excitation band at 295 nm. The Pb²⁺ excitation band is also observed by monitoring the Ce³⁺ fluorescence, and the Pb²⁺ and Ce³⁺ excitation bands, in addition to six Mn²⁺ excitation bands, are also observed by monitoring the Mn²⁺ fluorescence. These indicate that four types of the energy transfer can occur in calcite through the following processes: (1) Pb²⁺ → Ce³⁺, (2) Pb²⁺ → Mn²⁺, (3) Ce³⁺ → Mn²⁺ and (4) Pb²⁺ → Ce³⁺ → Mn²⁺.     

利用三维地震在戈壁沙漠区解决复杂地质构造问题

在分析戈壁沙漠地区地球物理特征的基础上，针对性的提出了解决煤田地质构造问题的方法，包括三维地震野外施工方法的选取、施工因素的选择、资料处理手段；并以获得的实际地质成果证实三维地震在解决复杂地质构造问题的可行性。     

Influence of Adoptment of Geocentric 3D Coordinate System on Chinese Existent Maps

If a geocentric 3D coordinate system is adopted in China to replace 2D non-geocentric coordinate system, the coordinates of the surface points will be changed accordingly. The influences on the current maps of China, especially the topographic maps, are discussed due to the replacement of the coordinate systems. Taking the replacement of Xi‘an 80 coordinate system by GRS80 for a numerical example, this paper analyzes the changes of latitude, longitude, Gauss plane coordinates of the surface points, as well as the orientation and the length changes between the points on the map, including the changes of map border lines and sheet corner points.     

二维电子地图和三维虚拟场景的互响应

本文提出了基于二维电子地图与三维虚拟场景之间相互响应的思想来克服它们各自的局限性.简要的描述了相互响应的原理、表现形式、实现流程及实现方法.最后提出了一些结论和展望.     

基于IMAGIS的数字小区建模探讨

随着城市化水平的不断提高，对城市的规划管理也提出了很高的要求，数字城市作为数字地球的重要组成部分正是在这一背景下提出的。本文结合适普公司的IMAGIS软件，对城市小区鼍维场景建设中的相关问题进行了探讨，并以遂宁市某街区为例进行了实践。     

基于3DCM的日照分析模型研究

讨论了几何3DCM（three dimension city model）日照分析的基本模型．基于3DCM日照分析的3个难点问题——阴影显示、日照时间计算、日照间距计算．实现了日照分析的算法功能，并给出了实验与模拟分析结果。     

黑龙江省中部森林沼泽区 超低密度深穿透地球化学调查采样介质的确定

通过对王水溶矿法与四酸溶矿法的对比,元素在泛滥平原A层、B层沉积物及水系沉积物中的分配,以及这3种介质圈定的异常对比等综合因素的研究,确定了泛滥平原A层沉积物是黑龙江省中部森林沼泽区开展超低密度深穿透地球化学调查的有效采样介质。     

基于体素模型的三维显示技术

针对矿产资源勘探数据的特点,研究了适合地质体信息三维可视化的体绘制模型和空间插值算法。基于IDL软件平台,开发了三维数据可视化软件;该软件能够快速、准确地将地质体的物性特征展示出来。最后,以内蒙古某金属矿床钻孔资料为例,对建立的三维可视化方法技术进行了应用检验,取得了较好的应用效果。     

利用Java-X3D实现地震层位三维可视化

地震层位三维可视化可以提供形象化的地震层位三维特征,便于地震资料的后期解释.在叙述地震层位三维可视化技术原理、目标、方法的基础上,尝试利用Java-X3D技术实现地震层位三维可视化,并利用实际坐标数据,实现了在Internet上跨平台的地震层位及地质构造三维可视化模拟,取得了良好的效果.