Vondrak滤波法在定点地形变资料分析中的应用

本文使用天文学数据处理中常用的Ｖｏｎｄｒａｋ平滑滤波法，对库尔勒短水准和呼图壁断层形变资料进行了高通、低通和带通数字滤波处理。结果表明，处理后的资料突出了地震前不同周期的地壳形变异常信息，降低了背景噪声和观测误差的影响。该方法对于识别形变异常有较好的效果。     

地层倾角测井资料在山东马厂地区沙河街组沉积微相研究中的应用

本文论述地层倾角测井资料在山东马厂地区沉积微相研究中的应用。通过地层倾角资料进行特殊处理,结合岩心观察、常规测井资料,验证了倾角解释模式,成功地确定了砂体的沉积层理类型、古水流方向,指出了砂体延伸和增厚方向,阐明了下第三系沙河街组沙三中亚段四种沉积微相的沉积和分布特征。研究成果用于该区的砂层对比、开发注水、井网调整和预测砂体成因类型,指导该区的勘探和开发。     

Robustness of noise filtering by kriging analysis

In geostatistics, factorial kriging is often proposed to filter noise. This filter is built from a linear model which is ideally suited to a Gaussian signal with additive independent noise. Robustness of the performance of factorial kriging is evaluated in less congenial situations. Three different types of noise are considered all perturbing a lognormally distributed signal. The first noise model is independent of the signal. The second noise model is heteroscedastic; its variance depends on the signal, yet noise and signal are uncorrelated. The third noise model is both heteroscedastic and linearly correlated with the signal. In ideal conditions, exhaustive sampling and additive independent noise, factorial kriging succeeds to reproduce the spatial patterns of high signal values. This score remains good in presence of heteroscedastic noise variance but falls quickly in presence of noise-to-signal correlation as soon as the sample becomes sparser.     

改进的Sage自适应滤波方法

本文首先介绍了 Sage自适应滤波方法 ,分析了基于新息向量、残差向量和状态参数预报值改正向量的协方差自适应估计所存在的问题 ,提出了改进 Sage自适应滤波的新方法。结果表明 ,该方法能有效地控制状态方程异常对动态系统参数估值的影响     

基于偏好融合的群组推荐研究

传统的推荐系统主要针对单个用户,但随着社会和电子商务的快速发展,人们越来越多地以多个用户的形式一起参与活动,而群组推荐旨在为多个用户组成的群组提供服务,已成为当前研究的热点之一.针对目前群组推荐准确率低,群组成员之间偏好冲突难以融合的问题,本文提出了一种新的共识模型策略,融合了群组领袖影响因子和项目热度影响因子,基于K近邻为目标群组寻找邻居群组,借鉴邻居群组的偏好,设计了基于偏好融合的群组推荐算法.在MovieLens数据集上的实验结果表明,本文所提的融合策略较传统的偏好融合策略有着更优越的表现,推荐准确率（nDCG）的总体平均性能约提高13%,推荐列表多样性指标的总体平均性能约提高10%.     

一种利用坡度分区滤波的DEM转换等高线方法

针对DEM转换等高线时,现有方法不能方便、有效处理好曲线光滑与地貌精度损失之间的关系,提出了基于坡度分区滤波的DEM转换等高线方法。对不同的坡度分区采用不同大小的窗口进行均值滤波,并对滤波高程差值进行控制,较好地处理了曲线光滑与地貌精度损失之间的关系;同时,对计曲线之间的窄部首曲线进行自动识别和打断删除。基于该方法,利用ArcGIS+Python脚本开发了DEM到等高线自动转换工具,在数字广西地理空间框架建设1：1万DLG项目的等高线采集工作中得到了初步应用,取得了良好的效果。     

一种基于GPS/BDS观测值的抗多路径误差导航定位算法

提出一种抑制卫星导航定位中多路径误差的算法,采用双卫星系统GPS/BDS的伪距和多普勒观测值,增加了观测值数据的有效性,结合抗差自适应卡尔曼滤波模型,减弱了城市稠密建筑中卫星导航定位多路径误差对定位的影响。城市车载实验结果显示,与GPS单系统伪距定位相比,采用GPS/BDS伪距定位,点位精度由4.9 m提高到4.3 m;采用本文算法,点位精度进一步提高到3.4 m,验证了本文算法的有效性。     

基于Poynting矢量的地震照明分析

地震照明分析能够定量分析影响逆时偏移成像质量的因素。文章基于Poynting矢量方法进行地震定向照明分析及成像补偿方法研究,利用Poynting矢量进行波场传播角度分解,通过计算不同入射及散射波方向的部分照明建立局部照明矩阵。该矩阵包含了照明分析中波与地质结构相互作用所涉及的所有角度信息,可以方便地分析目标附近所有可能的入射波和散射波对局部照明的贡献。根据局部照明矩阵可以获得对地下结构的照明描述、采集倾角响应,并依此进行成像补偿计算。以SEG/EAGE模型作为数值计算实例,进行基于Poynting矢量的照明分析及成像补偿,有效地提高了成像质量。该方法为角度域逆时偏移成像校正及分辨率分析等提供了高效的处理手段。     

基于大涡模拟和局部滤波同化方法的海洋环流模式

结合最小二乘法极值原理,提出了一种基于局部谱展开的滤波同化方法,把测量数据和数值计算过程中出现的高频短波滤掉,并将高度计数据同化到了求解过程中.结果既增加了数值稳定性,又提高了数值模拟的准确性.针对在海洋环流问题中水平的流动性质和垂直的不同的特点,我们还将大涡模拟的思想和直接涡黏的思想分别应用于水平方向和垂直方向,给出的方法是一种适用于海洋环流和浅水环流问题的大涡模拟湍流模式.对热带和北太平洋一年四季非定常季风作用下环流的数值模拟表明,提出的方法非常有效,数值结果与实际相当吻合.     

Structural Analysis for Gold Mineralization Using Remote Sensing and Geochemical Techniques in a GIS Environment: Island of Lesvos,Hellas

Exploration for epithermal Au has been active lately in the Aegean Sea of the eastern Mediterranean Basin, both in the islands of the Quaternary arc and in those of the back-arc region. The purpose of this study was the structural mapping and analysis for a preliminary investigation of possible epithermal gold mineralization, using remotely sensed data and techniques, structural and field data, and geochemical information, for a specific area on the Island of Lesvos. Therefore, Landsat-TM and SPOT-Pan satellite images and the Digital Elevation Model (DEM) of the study area were processed digitally using spatial filtering techniques for the enhancement and recognition of the geologically significant lineaments, as well as algebraic operations with band ratios and Principal Component Analysis (PCA), for the identification of alteration zones. Statistical rose diagrams and a SCHMIDT projection Stereo Net were generated from the lineament maps and the collected field data (dip and strike measurements of faults, joints, and veins), respectively. The derived lineament map and the band ratio images were manipulated in a GIS environment, in order to study the relation of the tectonic pattern to both the alteration zoning and the geomorphology of the volcanic field of the study area. Target areas of high interest for possible mineralization also were specified using geochemical techniques, such as X-Ray Diffraction (XRD) analysis, trace-element, and fluid-inclusion analysis. Finally, preliminary conclusions were derived about possible mineralization, the type (high or low sulfidation), and the extent of mineralization, by combining the structural information with geochemical information.