[基础科学]重要期刊的摘要范例.doc

基于Gabor变换的欠定盲信号分离新方法 DOI： 中文关键词: 非平稳信号;欠定;Gabor变换;盲信号分离 英文关键词:Non-stationary signal under-determined mixtures Gabor transform blind source separation 基金项目: 作者 单位 申永军，张光明，杨绍普 摘要点击次数: 12 全文下载次数: 2 中文摘要: 结合Gabor变换和盲信号分离的各自优点,提出了一种基于Gabor变换的欠定盲信号分离新方法。首先通过混合信号的Gabor变换系数之间的相互关系,得到了源信号个数的估计;然后对Gabor变换后的信号进行阈值处理，并进行Gabor逆变换得到新的混合信号,从而实现混合信号的升维。再利用现有的盲信号分离方法进行处理，该方法不受源信号个数的限制,因此属于一种欠定盲信号分离方法；最后,通过一组仿真信号的欠定盲分离验证了该方法的有效性。 英文摘要: A new method of blind source separation (BSS) is proposed in under-determined mixtures based on Gabor transform, and it combines the advantages of Gabor transform and BSS. Firstly, one can obtain the estimate for the number of source signals by the ratios of the coefficients of the mixed signals in Gabor transform field. Then, the appropriate threshold values are selected to process the Gabor transform coefficients, and the inverse Gabor transform is applied to the revised signals. This obtains new combinations of source signals to increase the dimensions of mixed signals. Moreover, the existing BSS methods, such as JADE, can be applied to the new mixed signals with the existing mixed ones, and one can obtain the separated source signals. The effectivity of the method is verified by some simulated signals. 混凝土结构复杂缺陷的SWRI诊断技术 DOI： 中文关键词: 混凝土; 缺陷检测; 成像技术; 反射 英文关键词:Concrete damage detection imaging techniques reflection 基金项目: 作者 单位 骆英，李忠芳 摘要点击次数: 31 全文下载次数: 11 中文摘要: 提出了混凝土结构中任意缺陷的应力波反射成像测试与诊断方法。利用特定的数据采集方法和应力波叠前偏移成像算法,测试预埋复杂形状缺陷的混凝土试件,分别采用不同数量的应力波信号获得了多张叠前偏移剖面图像。试验结果表明,随着应力波数量的增加,叠前偏移剖面能够反映的缺陷区域更广,成像更加清晰。当利用足量应力波信号进行叠前偏移成像处理时,试验结果诊断误差很小,能满足工程的精度要求。 英文摘要: A stress wave reflection imaging(SWRI) method is presented to test and diagnose the complex defects in the concrete structure. The method for collecting stress wavedata and the SWRI algorithm are used to detect the specimen with embedded complex defects, the corresponding pre-stack migration images are obtained by usingdifferent numbers of collected