Study on Unified Inter-Spherical Acting of Continental Collision of Tibet Plateau

STUDY ON UNIFIED INTER-SPHERICAL ACTING OF CONTINENTAL COLLISION OF TIBET PLATEAU     

影响华南沿海的热带气旋分析

利用１９４９－１９９８年《台风年鉴》和气候与水文资料,对华南沿海的热带气旋作了统计分析,结果表明：登陆华南沿海的热带气旋是厄尔尼诺年较反厄尔尼诺年少,近期厄尔尼诺过程对 旋活动影响尤为明显。登陆各少区热带气旋的年际变化存在明显差异,月际变化是登陆的高峰月份较一致。登陆个数提广东省居多,广西区最少,登陆岸区较集中。影响华南沿海海区的台风,东部海区明显地少于西部海区。５０ａ间,我国台风最大风速和最大增     

Extraction of plasmid-like DNA and high-quality total DNA from Porphyra yezoensis

I~ODWrIONExtraction of DNA from Porphyra po~nsis is very difficult due tO its high content ofpolysaccharides. TO avoid the interference Of POlysaccharides, HOng et al. (1992) used LiCI tosoften Porphyra thalli cells to release DNA directly without lysing the thalli, hoWever, the procedure is problematic in the isolation of high-quality DNA. Kitade et al. (1996) established a complicated procedure which includes the grindiflg of material in liquid nitrogen, lysing of material inextra…     

一种双目混合追踪的视觉里程计算法

针对特征点法视觉里程计(visual odometry,VO)中,描述子匹配算力要求较高,而光流追踪算法存在误差累积的问题,提出了一种双目混合追踪的视觉里程计算法,并通过实验对该方法的定位结果与计算效率进行分析.在该算法中,前端在影像关键帧提取ORB(oriented brief)特征点并生成路标点,优先采用Inverse Compositional光流进行追踪,使用卡方检验等检测外点;为检测定位粗差,提出通过由相邻帧位姿恢复的极线进行检验;光流追踪失败或未通过极线检验时,提取ORB特征点维持跟踪或进行重定位;同时,后端进行相机位姿、路标点联合优化以减小误差累积.实验结果表明,该算法定位精度低于ORB-SLAM2(simultaneous location and mapping)算法,但运算效率有明显提升.     

基于地理量化方法的四川省A级旅游景区空间分布结构研究

利用数理统计和地理信息空间分析方法,从定量和定性两方面探讨四川省221个A级旅游景区的空间分布结构,分析其空间分布规律。结果表明：四川省A级旅游景区的空间分布类型属于集聚型,且区域间差异较大,空间分布均匀度较低,不均衡性显著;四川省A级旅游景区规模等级结构表现为中间大两头小的纺锤形结构,中端的市场供给占据上风;四川省A级旅游景区空间分布受地理区位、交通条件、景区地域组合状况和经济发展水平等多种因素综合影响。     

温度和电子传递体AQDS对铁还原细菌Shewanella putrefaciens CN32矿化产物的影响

微生物矿化产生的超顺磁性(SP)磁铁矿是沉积物和土壤中磁性矿物的重要来源.本文比较了三个不同温度下(20℃,30℃,37℃)纯培养铁还原细菌Shewanella putre aciens CN32还原水合氧化铁形成SP磁铁矿的矿化特征.在实验体系中加入细菌CN32后,体系的氧化还原电位Eh迅速下降,酸碱度pH和亚铁离子...     

地震各向异性流体检测技术在胜利油田垦71井区的应用(英文)

根据Chapman理论模型,在各向异性介质(如HTI介质)中,当入射角在0-45。范围内,慢横波会发生较大的衰减和频散,且对流体粘度敏感,而P波和快横波则比较小。对于沿裂隙法向传播的慢横波,其振幅受流体影响很大。因此,在P波响应对流体不敏感的情况下,可利用慢横波来获得裂隙型油气藏的流体信息。本文分析了胜利油田垦71地区三维三分量地震数据,检测出的慢横波振幅和旅行时异常与该区的测井资料十分吻合。分析结果还发现,与含油区相比,含水区会产生更高的横波分裂。在含水区,慢横波振幅会产生明显变化,而在含油区则几乎没有变化。     

Influence of ground motion spatial variation,site condition and SSI on the required separation distances of bridge structures to avoid seismic pounding

It is commonly understood that earthquake ground excitations at multiple supports of large dimensional structures are not the same. These ground motion spatial variations may significantly influence the structural responses. Similarly, the interaction between the foundation and the surrounding soil during earthquake shaking also affects the dynamic response of the structure. Most previous studies on ground motion spatial variation effects on structural responses neglected soil–structure interaction (SSI) effect. This paper studies the combined effects of ground motion spatial variation, local site amplification and SSI on bridge responses, and estimates the required separation distances that modular expansion joints must provide to avoid seismic pounding. It is an extension of a previous study (Earthquake Engng Struct. Dyn. 2010; 39 (3):303–323), in which combined ground motion spatial variation and local site amplification effects on bridge responses were investigated. The present paper focuses on the simultaneous effect of SSI and ground motion spatial variation on structural responses. The soil surrounding the pile foundation is modelled by frequency‐dependent springs and dashpots in the horizontal and rotational directions. The peak structural responses are estimated by using the standard random vibration method. The minimum total gap between two adjacent bridge decks or between bridge deck and adjacent abutment to prevent seismic pounding is estimated. Numerical results show that SSI significantly affects the structural responses, and cannot be neglected. Copyright © 2010 John Wiley & Sons, Ltd.     

Petrographic, geochemical and geochronological investigation on granitic pebbles from Permotriassic metasediments of the Tisia terrain (eastern Papuk, Croatia)

Granitic pebbles occurring in the Permotriassic metasedimentary sequence of eastern Papuk, Slavonian Mountains, Croatia, were recognized to represent a coherent group of felsic, muscovite-albite metagranites. Fabrics, modal compositions and geochemical data imply that the rocks are derivatives of S-type granites formed through a combination of igneous and subsequent metasomatic processes. A Variscan formation age is demonstrated by K-Ar dating on coarse muscovite (range of 329?C317?Ma) as well as by electron microprobe based Th-U-Pb monazite dating (338?±?15?Ma). Additionally to the Variscan metasomatic processes of albitization and greisenisation, which led to an almost complete replacement of K-feldspar and biotite by albite and coarse muscovite, pebbles were affected by a younger phase of alteration resulting in the formation of a fine-grained sericitic matrix. The fine sericite yields K-Ar ages of 91?C83?Ma. A substantial reheating of the rocks during the Cretaceous is also indicated by the growth of new monazite dated at 106?±?10?Ma. Yttrium-contents of the Cretaceous monazite from the granite pebbles (0.3?C0.9?wt% Y₂O₃) are compatible with metamorphic temperatures of ~350?C400°C. These data confirm recent concepts according to which large parts of the Slavonian Mountains received a pervasive Cretaceous low-T regional metamorphic overprint. Furthermore, the pebbles provide useful information on the nature of the eroded Variscan crust of the Tisia Terrain, which has obviously contained considerable amounts of evolved high-level S-type granites modified through albitization and greisenization.