龙门山褶皱逆冲带中前山逆冲带之新期构造及断层运动学(英文)     

徐澔德  Ling-Ho Chung  Xi-wei Xu  Kuang-Yin Lai  Yue-Gau Chen 《国际地震动态》2010,(6):32-33

The disastrous Wenchuan, Sichuan, earthquake (MS=8.0) on 12 May 2009 ruptured several major thrust faults of the Longmenshan fold-and-thrust belt, along the western margin of the Sichuan Basin.  相似文献   

Visual-Semantic Modeling in Content-Based Geospatial Information Retrieval Using Associative Mining Techniques     

Barb  A. S. Shyu  C.-R. 《Geoscience and Remote Sensing Letters, IEEE》2010,7(1):38-42

Automatic learning of geospatial intelligence is challenging due to the complexity of articulating knowledge from visual patterns and to the ever-increasing quantities of image data generated on a daily basis. In this setting, human inspection and annotation is subjective and, more importantly, impractical. In this letter, we propose a knowledge-discovery algorithm that uses content-based methods to link low-level image features with high-level visual semantics in an effort to automate the process of retrieving semantically similar images. Our algorithm represents geospatial images by using a high-dimensional feature vector and generates a set of association rules that correlate semantic terms with visual patterns represented by discrete feature intervals. We also provide a mathematical model to customize the relevance of feature measurements to semantic assignments as well as methods of querying by semantics and by example.   相似文献   

气象与城市火灾及预报方法研究   总被引：6，自引：1，他引：5  

张书余  乔锐平  陈道红 《气象》1999,25(10):48-52

分析河北省４５年的火灾和气象资料得知,河北省火灾发生的次数与相对湿度,降雨日数,气温成反比,与雷击次数,风速成正比,气象要素是重大火灾发生的主要环境因素,依据火灾和气象要素的统计关系建立了河北省火险等级预报系统。  相似文献   

Analysis and reversal of dry and hydroelastic vibration modes of stiffened plates     

Pi-Liang Li  Rong-Juin Shyu  Wei-Hui Wang  Chieh-Yuan Cheng 《Ocean Engineering》2011,38(8-9):1014-1026

This work describes the theoretical modal analysis model for the stiffened bottom plate of a tank that is filled with fluid having an undisturbed free surface. In the analysis model, the effects of bending, transverse shear and rotary inertia in both the plate and the stiffener are considered. Analytical results concerning the natural frequencies of the stiffened plate correlate well with experimental modal testing (EMT) results for above the second mode. To overcome the complexities in the modal analysis of the fluid–structure interaction, the Mindlin plate theory and the potential flow theory are applied; the velocity potential is also expressed using double finite Fourier transforms. Additionally, a parametric study was also performed for eigenfrequencies of the plate with a stiffener, in terms of the ratio of the depth of the stiffener to the thickness of the plate and that of the width of the stiffener to the thickness of the plate. Analysis results revealed the phenomenon of “mode reversal”, i.e. the first and second mode shapes of the plate with a deep stiffener in contact with air and water, respectively, are reversed. An occurring condition of “mode reversal” is derived and verified by both finite element analysis and EMT.  相似文献