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2006年夏、冬季珠江口附近海域水文特征调查分析

根据珠江口外沿岸海域2006年夏季(7-8月)及冬季(2006年12月-2007年1月)航次的CTD调查资料,分析了调查海域夏季与冬季的温度、盐度分布,温度、盐度、密度跃层特征及其与上升流、中尺度涡旋和海流的关系.结果表明:1)夏季调查海域冲淡水扩展、上升流、中尺度涡等现象在温度、盐度分布中都有很明显的表征,并对跃层分布有显著的影响,形成了复杂的跃层类型;在冲淡水扩展的影响下,还形成了双跃层与障碍层现象.2)冬季海水混合剧烈,沿岸浅水区域跃层现象不明显,在陆坡深水区存在跃层现象.     

利用证据权重法进行综合信息矿产资源预测——以大兴安岭北部地区为例

证据权重法是一种重要的矿产资源预测方法,它是基于二值图像的地学统计方法,通过对与矿产资源相关的地学信息的叠加分析进行预测,其优点是数据驱动、易于编程实现。笔者通过对大兴安岭北部地区金矿预测实验,证明证据权重法数学预测模型对区域成矿远景区预测有较高的准确性和科学性,同时在与ARCGIS系统结合后,可对多源信息进行空间位置综合处理并形成新的综合变量,能更全面、客观的反映地质体空间特征,使成矿预测更加准确。     

离散数据地球化学编图中克里格法的应用——以津巴布韦超低密度地球化学图为例

自由网离散数据的地球化学编图以任意方式进行网格化成图存在明显不确定性,会导致地球化学特征的改变或歪曲。克里格法提供了一种更科学合理的空间估计插值方法。笔者运用该方法对津巴布韦超低密度地球化学调查数据进行了空间分析并编制了地球化学图件,研究和讨论了自由网离散数据的地球化学编图方法,评价了采用克里格法编制地球化学图的效果。     

空间目标的地球引力加速度分析及工程实现

目前国内缺少针对雷达观测数据的空间目标定轨开源软件,给从事雷达系统设计的非轨道力学专业的研究人员带来不便.研制定轨软件的核心内容是摄动加速度计算,它是实现高精度数值轨道计算的基础.为此,本文以地球引力为例,介绍了地球非球形引力摄动的数学原理,给出了加速度计算的程序设计思路,实现了接口函数并集成到笔者前期开发的雷达定轨函数库(RadarOrbDet)中.实验结果验证了本文接口函数的有效性,表明该定轨函数库可以辅助科研人员进行雷达系统设计.     

Improved AHP method and its application in lake environmental comprehensive quality evaluation a case study of Xuanwu Lake, Nanjing, China

The relative importance of each pollution factor in analytical hierarchy process (AHP) method comes from pooling expert opinions in general. Because expert opinions are based on information and judgment criteria, determining their weight may lead to uncertainty.. Therefore, an improved AHP method had been developed. The process of the improved AHP method involved four key procedures. The weights of pollution factors were completely related to the objective monitoring data through the standardization of these procedures. The environmental comprehensive quality of water and sediment of Xuanwu Lake, Nanjing, China had been evaluated. The environmental quality comprehensive indices (EQCI) of the water in 1991-1995 and 1996-2000 were 3.32 and 1.85, respectively, indicating that the water quality improved. The EQCI of the sediment in 1995 and 2000 indicates that the sediment contamination decreased from 1995 to 2000. Such results agreed with the fact that the lake had been under comprehensive control. However, with the classical AHP method, the EQCI of the sediment in the northwestern part of the lake may have indicated that sediment contamination increased from 1995 to 2000. The discrepancy may have resulted from the judgment difference of the experts. The improved AHP method can avoid arbitrariness of subjective judgment and can reflect the real influential factors of environment pollution in different periods or regions.     

云南文山5.3级地震跨断层形变短期前兆研究

将云南东部的断层网络视为一个互有关联的动力学系统,利用蕴震系统信息合成方法对该系统15条跨断层短水准和14条短基线资料进行处理与分析,结果表明：2005年8月云南文山5．3级地震前,断层形变短期异常明显,且水平运动异常较垂直运动更为明显。