基于主成分分析的目标确认方法及其在车标定位识别中的应用

提出一种基于主成分分析的目标确认方法,解决小目标定位错误率高,并由此导致无效目标识别的问题.将已建好的目标模板看成一组随机向量,利用主成分分析得到一组特征目标;从原图像中检测可能目标,并将其映入特征目标空间进行重构;构造原目标与重构目标的似真度函数,根据该函数值可对检测目标进行确认或剔除,降低误定位率,确保了进入后续识别的目标为目标库中对象.将该方法应用在实测车辆图像车标定位识别测试,结果表明:与不使用似真度函数验证相比,目标定位准确度提高了16.5%;使用不变矩最小距离分类器进行车标识别,识别准确度比不使用似真度函数确认提高了20%.     

影响微震震源定位精度的主要因素分析

 微震震源坐标是微震监测最基本和最重要的参数之一,定位精度的高低直接影响着微震分析的结果。研究分析了微震震源定位精度的影响因素,台站误差,速度误差及由优化算法带来的误差。采用优化算法确定震源的坐标及震源事件的发生时间时,不同算法求解的源坐标值相差很大,为此,如何选取合理的优化算法意义重大。将麦夸特法(LM)、简面体爬山法(SM)、准牛顿法(QN)、最大继承法(MIO)、自组织群移法(SOMA)、麦夸特法与全局优化算法(LM-GO)、简面体爬山法与全局优化算法(SM-GO)、准牛顿法与全局优化算法(QN-GO)、最大继承法与全局优化算法(MIO-GO)应用到震源定位中,分析不同算法对震源定位精度的影响。研究发现单纯使用MIO、QN、LM很容易陷入局部最优值,选用时应慎重,联合使用全局最优算法可以显著提高定位精度。SOMA、SM-GO、MIO-GO、LM-GO计算结果较为稳定,定位精度高,建议在声发射源与震源定位时优先选用。     

The 3-D structure of shear wave in South China and the southward extension of Tanlu fault

By processing the CSND Rayleigh wave data with the matched filter FTAN technique, Rayleigh wave disper- sion for southeast China is obtained. The 4°×4°S wave dispersion of the pure path is calculated using random inversion scheme, and 3-D S wave velocity structure is set up. Incorporating the above-mentioned results with wide angle seismic sounding data, we studied structure framework and the extending of faults in this area, which demonstrates that the depth of Moho in South China varies from 30 to 40 km, shallower from west to east. The depth of Moho varies from 25 to 28 km for the offshore. The depth of the asthenosphere in upper mantle varies from 60 to 100 km. The depth difference of layers at the two sides of Tanlu fault is more than 10 km at the south part of the Yangtze River, and the fault extends downward more than 170 km. The fault exceeds the main land at Hainan Island and slips into the southern China Sea. Both Tanlu fault and the huge bend of gravity gradient anomaly are influenced by deep latent tectonics.     

采用一种新的乌龟坐标变换对Kinnersley黑洞视界表面引力及量子辐射的研究

作者采用一种乌龟坐标变换,对动态Kinnersley黑洞的视界表面引力和量子辐射特征进行了研究,对弯曲时空中的粒子运动方程的研究表明,根据弯曲时空中的Hamilton-Jacom方程,不仅可以研究量子非热辐射特征,而且可以研究黑洞视界表面引力等特征量.     

The effect of phase transition on the compressional wave velocity for a trachybasalt at high temperature and high pressure

Compressional wave velocities in a trachybasalt, from Yichuan County, Henan Province, have been measured at 2.0 GPa and up to 1 350℃ in a YJ-3000 t cubic-anvil high-pressure apparatus. The run products have been gained at the same pressure but different temperatures, the observation of the thin sections of the run products indicates that, corresponding to the variation of the compressional wave velocity in the trachybasalt, the phase transition has taken place. The relationship between the change of the compressional wave velocity and the hydrous mineral dehydration, solid-solid phase transformation and partial melting has been discussed. The experimental data presented here are of great importance to elucidating the geological process in the earth's interior.     

Application of the Three-Dimensional Shallow Sea and Continental Shelf Mode for Inversion of Undercurrent

0Introduction Muchresearchworkonoceancirculationhasbeendoneandsomenumericalmodels[14]havebeendeveloped.Athreelayer3DmodelwasraisedbyLeendertseandLiu[5].Butthesolutionofthemodelinthe(x,y,z)coordinatesys temrequireshugecomputationalquantity.XuDongfenget al[6]andFangGuohongetal[7]setupa3Dmodeltocalculateoffingcirculation.A3Dmodelinσcoordinatesystemwasap pliedtoEuropeanNorthSeabyDuranceandHughes[8],butnonlineartermswereignored.Differentmodelsareadoptedin simulationfordifferentproblems.Thea…     

反应工程中一类二阶常微分方程边值问题的初值化及求解

对于在反应工程中常见的一类特殊的二阶常微分方程边值问题,给出了二分法初值化求解的一种新方法。具体求解了多孔催化剂和多孔电极两个数学模型,给出了在不同参数下二者解的曲线。与传统的打靶法相比,此方法回避了复杂的迭代运算,只需用简单的二分法求解一个变上限函数表达的初值满足的方程。此方法利用MATLAB计算广义积分精度高的特点所确定的初值也可以达到很高的精度。     

从一件审查逮捕案件看如何区分适用刑法第267条第2款与第269条的问题

案发前,程正华与程东合谋抢钱,并向程东出示过匕首,案发时,程正华亲自抢包,但未向被害人出示过匕首,程东假借问路,阻拦被害人及时抓捕程正华,后逃跑,程正华不知主犯用匕首拒捕的情况。程正华在逃跑过程中,使用随身携带的匕首抗拒抓捕。程正华没有向被害人明示或暗示凶器,仍然应认定为携带凶器抢夺,而不是刑法第269条规定的事后抢劫,程东对程正华携带凶器这一构成要件事实有认识,并且为之逃匿提供帮助,也构成抢劫罪的共犯,两人的行为,符合最高人民法院《关于审理抢劫、抢夺刑事案件适用法律若干问题的意见》①第4条规定的情况,应适用刑法第267条第2款的规定,依照抢劫罪定罪处罚。