三塘湖盆地构造演化与油气聚集          下载免费PDF全文

吴晓智  郎风江  李伯华  齐雪峰  刘得光 《地质科学》2011,(3):808-825

三塘湖盆地处于西伯利亚板块南缘,早石炭世晚期,盆地褶皱基底形成;晚石炭世早期,总体处于碰撞期后伸展构造环境;晚石炭世晚期,洋壳消亡,断陷收缩与整体抬升,形成剥蚀不整合.早二叠世,进入陆内前陆盆地演化阶段;中二叠世,盆地进入推覆体前缘前陆盆地发育期;晚二叠世,构造褶皱回返,前陆盆地消失;三叠纪晚期至侏罗纪中期,进入统一坳...  相似文献   

Primary species recognitionand phylogeny of Chondrus （Gigartinales, Rhodophyta） using 18S rDNA sequence data     

胡自民  曾晓起  段德麟 《中国海洋湖沼学报》2007,25(2):174-183

The nuclear-encoded small subunit ribosomal RNA gene (18S rDNA) of 16 isolates of Chondrus from 8 countries were sequenced. A total of 1796 nucleotides were obtained and aligned with the phylogenetic analysis conducted. The results suggest that the entity from Dalian, China, regarded as C. sp1 is C. pinnulatus. The C. sp2 previously depicted as C. yendoi or Mazzaella japonica may belong to genus Chondrus. So, 4 Chondrus species, i.e. C. ocellatus, C. nipponicus, C. armatus, and C. pinnulatus are distributed in China. However, the entity from Connemara, Ireland, named C. crispus, is not a Chondrus species but that of Mastocarpus stellatus, although it is morphologically similar to C. crispus. Phylogenetic analysis based on complete 18S rDNA sequence data shows that genus Chondrus includes 3 main lineages: the Northern Pacific lineage, containing C. ocellatus, C. yendoi, and C. nipponicus; C. armatus, and C. pinnulatus form the sub-North Pacific lineage; and the Northern Atlantic Ocean lineage, comprising samples of C. crispus from Canada, Portugal, Ireland, Germany and France. The phylogenetic relationships indicate that genus Chondrus might have a North Pacific ancestral origin, radiated to North Atlantic area, and then formed the species C. crispus.  相似文献   

基于NAO机器人目标识别与定位算法     

柏雪峰  杨斌 《成都信息工程学院学报》2014,(6):625-629

针对目前应用最广的新型仿人机器人NAO平台,和其官网发布的目标识别算法原理,提出一种改进的识别方法,降低光照对目标识别的影响,缩短机器人识别、定位和跟踪整个过程闭环操作过程的反应时间。其中搜索路径采用原地查找、走动和旋转查找三部曲实现360度全视野搜索;目标颜色识别基于YUV颜色空间进行;目标跟踪采用目标始终在视野中心算法实现;同时分析第四代NAO机器人的硬件参数设计头关节垂直偏角与目标的距离计算公式,用于目标快速定位。  相似文献   

Characterizing turbulent overturns in CTD-data     

《Dynamics of Atmospheres and Oceans》2014

We are concerned with the shape of overturns due to irreversible effects of turbulent mixing through internal wave breaking in the ocean. Vertical (z) overturn displacements (d) are computed from ship-borne SeaBird-911 CTD-data using the well-established method of reordering unstable portions in vertical density profiles. When displayed as a function of z, the displacements d(z) reveal a characteristic zigzag shape. Here, we primarily investigate the particular slope (z/d) of this zigzag signature after assigning the displacements to the end-point depths. Using model-overturns we show that this slope equals ½ for a solid-body-rotation, while a more sophisticated Rankine-vortex overturn-model, here employed in the vertical, has slopes slightly >½ in the interior and >1 along the sides. In the case of a near-homogeneous layer, displacement-points fill a parallelogram with side-edges having a slope of 1. The models are used to interpret overturn shapes in NE-Atlantic-Ocean-data from moderately deep, turbulent waters above Rockall Bank (off Ireland) and from deep, weakly stratified waters above Mount Josephine (off Portugal). These are compared with salinity-compensated intrusion data in Mediterranean-outflow-waters in the Canary Basin. Dynamically, most overturns are found to resemble the half-turn Rankine-vortex model and very few a, small-only, solid-body-rotation. Additionally, the usefulness and uselessness of upcast-CTD-data are discussed for overturn characterization.  相似文献   

雷达回波顶高（ET）产品在广西冰雹云识别中的应用研究   总被引：1，自引：0，他引：1  

张正国  邹光源  刘丽君  程鹏 《气象研究与应用》2014,35(4):89-92

利用广西2009至2012年降雹样本资料和新一代天气雷达回波顶高（ET）产品,对广西冰雹云回波顶高变化特征进行统计分析,结果显示广西冰雹云的ET整体呈现明显的阶段性变化特征,降雹时间和ET值达到最大值时间基本一致。冰雹云量化识别指标分别为：2月份回波顶高≥8km且回波顶高与0℃层高度差36.1km;3-4月份回波顶高≥10km且回波顶高与0℃层高度差≥6.1km;5月份回波顶高≥13且回波顶高与0℃层高度差38.1km。降雹直径与冰雹云ET值和特征层高度差值成正相关关系,可作为估计降雹直径的一个重要参考依据。  相似文献   

二值图像中目标物体边界跟踪的一种快速算法及其应用     

陈旺  郭庆胜  范伟  张航  周贺杰 《测绘工程》2014,23(12):63-66

对比分析传统的二值图像边界跟踪算法,并在此基础上提出一种只根据邻近两个栅格的图像状态控制轮廓走向的新算法。实验结果表明,新算法搜索次数少,轮廓识别准确,且很好地解决了岛洞问题,最后在应用中验证了算法的有效性。  相似文献   

基于MATLAB图像处理的汽车牌照识别研究     

赵珊  裴亮  刘翠 《测绘工程》2014,(1):70-72

汽车牌照识别是智能交通领域的重要研究课题,整个过程主要分为预处理、车牌定位、字符分割、字符识别4个环节。用MATLAB软件编写代码实现每一个过程,有效地解决恶劣环境下的车牌定位、字符倾斜、字符分割等复杂问题,结果表明MATLAB在彩色汽车牌照的识别中十分有效。  相似文献   

Geometric structure simplification of 3D building models     

《ISPRS Journal of Photogrammetry and Remote Sensing》2013

The complexity of building models directly affects the application efficiencies of 3D urban maps. To address the challenges of building models with various structures, we propose a structural simplification method in this paper. The geometric structures of building models are classified into three categories: embedded structures, compositional structures, and connecting structures, which can be extracted separately through convex/concave analysis. Some specific rules are proposed for the simplification of geometric structures, and the building models are suggested to be simplified progressively. The robustness and efficiency of the method are demonstrated by experiments, and the applications of the Levels of detail of the building models are illustrated.  相似文献   

Speech recognition technology applied to intelligent mobile navigation system     

Wang Mi  Guo Bingxuan  Li Deren  Gong Jianya 《地球空间信息科学学报》2013,16(4):37-40

The capability of human-computer interaction reflects the intelligent degree of mobile navigation system. The navigation data and functions of mobile navigation system are divided into system commands and non-system commands in this paper. And then a group of speech commands are abstracted. This paper applies speech recognition technology to intelligent mobile navigation system to process speech commands and does some deep research on the integration of speech recognition technology with mobile navigation system. The navigation operation can be performed by speech commands, which makes human-computer interaction easy during navigation. Speech command interface of navigation system is implemented by Dutty ++ Software, which is based on speech recognition system-Via Voice of IBM. Through navigation experiments, navigation can be done almost without keyboard, which proved that human-computer interaction is very convenient by speech commands and the reliability is also higher.  相似文献   

卷积神经网络识别侧扫声呐影像的研究          下载免费PDF全文

张博宇  王晓  杨敬华  朱邦彦 《海洋科学进展》2022,40(1):102-109

卷积神经网络是当前应用最广泛的图像识别算法,利用大量数据对网络进行训练,即可达到快速、高效地对图像进行识别的目的 .由于卷积神经网络结构众多,且同一数据在不同网络表现也不尽相同,为了选择适用于分析沉船声呐数据的网络,使用Python搭建LeNet 5、AlexNet、VGG、GoogLeNet、ResNet系列(Res...  相似文献