岩浆驱动破裂的形态研究

轴地壳岩浆房是活动扩张中心海洋地壳结构的一个重要组成部分，轴地壳岩浆房通过深部岩浆源的补充，内部岩浆的同化熔融、结晶分异等岩浆房过程，其中的岩浆会破裂上覆的岩石层形成岩浆破裂，并沿岩浆破裂继续向上迁移。本文建立了岩浆迁移的层流模型，从理论上对岩浆迁移问题进行了探讨，并将遗传算法引入到该问题中来，用遗传算法求解了描述岩浆驱动破裂传播的积分方程。如果假设岩浆破裂在远离破裂末梢处的权限宽度为1M，则靠近末梢，破裂的宽度逐渐加大，在末梢处宽度为2m左右。并根据文献对岩浆流体的一些观测参数计算得出，岩浆破裂权限宽度不会很大，一般在1m左右的量级。     

基于倾斜摄影测量技术的高原地区三维城市建模研究

为建设"数字西宁"地理信息公共平台,本文利用AMC580多视角航空摄影仪的倾斜摄影技术和Smart3DCapture软件为数据处理平台,以高原城市西宁市实景真三维模型数据生产为例介绍了数据生产过程及其应用领域。结果表明,用倾斜摄影的方法能高效、高质量地实现实景真三维数据生产。倾斜摄影技术不仅从多个角度采集地面影像,从而克服了传统航空摄影技术只能从垂直角度进行拍摄的局限;倾斜摄影建立三维模型技术相对于传统的三维建模方法而言,凸显其建模速度快、成本低等优势;且所获取的真实、详细、丰富的地物信息,更符合人眼视觉习惯的真实且直观的世界。     

Investigating meteorological effect on river flow recession rate in an arid environment

ABSTRACT

This study explores previously unreported linkage between recession rates of rainfall hyetograph and river flow hydrograph in an arid environment in Sultanate of Oman. Ephemeral streams are hydraulically disconnected from groundwater aquifers and depend on rainfall to produce water that flows only for hours or a few days at most. It therefore prompted to hypothesize that the recession rate of the rainfall event controls the corresponding recession of river flow. To test this assumption, 1-h river flow rates and 20-min rainfall rates in Al-Khoud catchment area for the period 1997–2013 were analysed. The river flow recession rate and antecedent river flow were found to be inversely proportional, while their relation improved with increasing time span of cumulating the antecedent river flow. The results further show that the simulation of river flow recession rate can be improved by incorporating the combined effects of rainfall recession rate and antecedent moisture content.     

WCDMA增强型无线技术--HSDPA

介绍了WCDMA（宽带码分多址）增强型无线技术——HSDPA（高速下行分组接入）技术,详细讨论了其关键技术：AMC（自适应调制和编码）技术、HARQ（混合自动重传请求）技术以及快速调度和MIMO（多天线发射多天线接受）.并在此基础上,就HSDPA在WCDMA系统中的实现进行了较为深入的研究.