大型油罐沉降监测数据处理软件的实现

介绍了针对某批大型油罐的沉降监测数据处理软件制作过程,采用了Excel电子表格软件在VBA可视化编程环境下完成,实现了工程测量数据的及时处理分析。     

预破裂中声波信号参数特性

通过对岩石样品进行变形及破坏试验，研究断裂形成过程中的声发射记录（ＡＥ），以找到能解释地震前兆现象的方法．另外，对试验过程中获得的大量数据及资料进行了数理统计处理．     

PTrees: A point-based approach to forest tree extraction from lidar data

This paper introduces PTrees, a multi-scale dynamic point cloud segmentation dedicated to forest tree extraction from lidar point clouds. The method process the point data using the raw elevation values (Z) and compute height (H = Z − ground elevation) during post-processing using an innovative procedure allowing to preserve the geometry of crown points. Multiple segmentations are done at different scales. Segmentation criteria are then applied to dynamically select the best set of apices from the tree segments extracted at the various scales. The selected set of apices is then used to generate a final segmentation. PTrees has been tested in 3 different forest types, allowing to detect 82% of the trees with under 10% of false detection rate. Future development will integrate crown profile estimation during the segmentation process in order to both maximize the detection of suppressed trees and minimize false detections.     

利用光谱角敏感森林的高光谱数据快速匹配方法

提出了一种新的光谱匹配算法——光谱角敏感森林方法。在位置敏感哈希函数算法的基础上引入光谱角度量,并利用新的数据桶检索结构改进了原位置敏感哈希函数算法中部分目标光谱点无法得到匹配光谱的缺陷。理论和实验证明,光谱角敏感森林算法的计算效率较传统高维数据匹配方法有较明显优势。     

Automatic morphological classification of galaxy images

We describe an image analysis supervised learning algorithm that can automatically classify galaxy images. The algorithm is first trained using manually classified images of elliptical, spiral and edge-on galaxies. A large set of image features is extracted from each image, and the most informative features are selected using Fisher scores. Test images can then be classified using a simple Weighted Nearest Neighbour rule such that the Fisher scores are used as the feature weights. Experimental results show that galaxy images from Galaxy Zoo can be classified automatically to spiral, elliptical and edge-on galaxies with an accuracy of ∼90 per cent compared to classifications carried out by the author. Full compilable source code of the algorithm is available for free download, and its general-purpose nature makes it suitable for other uses that involve automatic image analysis of celestial objects.     

鲲鹏山变形监测方案设计

通过论述变形监测控制网的建立与优化、变形监测点的布设、变形监测与数据处理的方法,给出了一套比较完整的鲲鹏山变形监测方案。     

剔除高密度电阻率法三极装置浅部不均匀体效应影响的方法及效果

基于总结出的高密度电阻率法三极测量装置下的二维正演拟断面中浅部不均匀体畸变规律和特征,设计了一套能有效剔除三极测量装置浅部不均匀体效应影响的数据处理方法,成功应用于野外实测数据的处理。     

向下延拓在深部矿产勘探中的应用——以青海某矿区为例

勘测深部盲矿体时,矿体距离观测点较远,磁异常的相互叠加常常在地面形成具有一个磁异常中心的宽缓磁异常,分辨不清矿致异常和背景异常。通常用向上延拓、方向导数等处理的效果差强人意。笔者采用向下延拓方法处理了青海某矿区的宽缓磁异常,向下延拓深度为30倍点距,获得了精细的各矿体异常特征。通过与大量的见矿、未见矿钻孔比较,向下延拓场反映的磁异常位置与已见矿钻孔有较好的对应关系,同时指示出全部的未见矿钻孔都处于向下延拓场反映的磁异常外围。基于当前向下延拓方法的稳定计算问题已经取得突破,笔者认为针对一些大埋藏深度的宽缓磁异常采用向下延拓处理,区分叠加异常,圈定异常位置,可以获得事半功倍的效果,为钻孔布置提供佐证。同时对勘探精度也作了一些有意义的讨论。     

An optimal extraction algorithm for imaging photometry

This paper is primarily an investigation of whether the 'optimal extraction' techniques used in CCD spectroscopy can be applied to imaging photometry. It is found that using such techniques provides a gain of around 10 per cent in signal-to-noise ratio over normal aperture photometry. Formally, it is shown to be equivalent to profile fitting, but offers advantages of robust error estimation, freedom from bias introduced by mis-estimating the point spread function, and convenience. In addition some other techniques are presented, which can be applied to profile fitting, aperture photometry and the 'optimal' photometry. Code implementing these algorithms is available at http://www.astro.keele.ac.uk/~timn/.     

The journal Communications in Numerical Methods in Engineering with Biomedical Applications becomes the International Journal for Numerical Methods in Biomedical Engineering (IJNMBE) from 1st January 2010

Communications in Numerical Methods in Engineering, founded by Roland W. Lewis in 1985, will change its title to the ‘International Journal for Numerical Methods in Biomedical Engineering’ and has a revised Aims and Scope. Copyright © 2009 John Wiley & Sons, Ltd.