阿勒泰地区春季寒潮暴风雪气特征分析   总被引：1，自引：0，他引：1  

赵俊荣  晋绿生 《沙漠与绿洲气象(新疆气象)》2003,26(1):11-13

通过春季寒潮暴风雪天气的历史天气图和GMS－5卫星云图资料的分析，揭示了阿勒泰地区春季寒潮暴风雪天气的环流特点及云图特征，从中得出春季寒潮暴风雪天气的预报指标。  相似文献   

FI技术在油气地质研究中的应用新进展   总被引：1，自引：0，他引：1  

刘艳荣  吕新彪  何谋春 《矿物岩石地球化学通报》2003,22(3):245-250

流体包裹体(FI)为研究油气地质提供了一种崭新的思路、方法和手段。通过分析流体包裹体的类型、特征、丰度、均一温度、盐度、压力和成分，可以了解油气热演化程度，为油气生成时的物理化学条件和流体的来源等研究提供重要信息；在油气运移、聚集过程中，温度与成分等特征发生相应的交化，通过对不同阶段所捕获的FI的研究，可以确定油气的运移时间和深度，探明油气运移的通道和方向，评价油气资源潜力以及预测油气的勘探远景区。此外，作还用流体包裹体势图和流体包裹体地层学方法，从宏观上描述了油气的运聚方向和通道，指出了其会聚的最有利区段，为直接指导油气的勘探提供理论依据。  相似文献   

Simulation des changements climatiques au cours du XXI^e siècle incluant l'ozone stratosphériqueSimulation of climate changes during the 21st century including stratospheric ozone     

Jean-François Royer  Daniel Cariolle  Fabrice Chauvin  Michel Déqué  Hervé Douville  Rong-Ming Hu  Serge Planton  Annie Rascol  Jean-Louis Ricard  David Salas Y Melia  Florence Sevault  Pascal Simon  Samuel Somot  Sophie Tyteca  Laurent Terray  Sophie Valcke 《Comptes Rendus Geoscience》2002,334(3):147-154

Two climate simulations of 150 years, performed with a coupled ocean/sea-ice/atmosphere model including stratospheric ozone, respectively with and without heterogeneous chemistry, simulate the tropospheric warming associated with an increase of the greenhouse effect of carbon dioxide and other trace gases since 1950 and their impact on sea–ice extent, as well as the stratospheric cooling and its impact on ozone concentration. The scenario with heterogeneous chemistry reproduces the formation of the ozone hole over the South Pole from the 1970s and its deepening until the present time, and shows that the ozone hole should progressively fill during the coming decades. To cite this article: J.-F. Royer et al., C. R. Geoscience 334 (2002) 147–154.  相似文献   

Argiles et zéolites dans l'altération d'un volcan bouclier en milieu tropical (Le Piton des Neiges,La Réunion)     

Laurent Bret  Jean-Lambert Join  Xavier Legal  Jean Coudray  Bertrand Fritz 《Comptes Rendus Geoscience》2003,335(14):1031-1038

The drilling of a gallery through the Roche-Écrite massif (Reunion Island) allowed to sample the old formations of the ‘Piton des Neiges’ volcano. The mineralogical study of the alteration products of the formations showed significant variations of the zeolites/clay minerals ratio depending on the location of the rocks in the volcano. The abundance of zeolites in the formation near the surface hydrographic network or the underground water drainage system seems to be due to the physicochemical processes favouring zeolites in more open systems in their competition with secondary clays. To cite this article: L. Bret et al., C. R. Geoscience 335 (2003).  相似文献   

"3S"技术在四川木里地区金矿资源预测与定位中的应用     

徐韬  尹显科  宋元宝  李威 《四川地质学报》2005,25(2):122-126

在新的成矿理论、新思路的指导下,通过对已有地质、物探、化探、遥感资料进行二次开发及综合研究分析。应用以遥感技术(RS)为主。辅以GIS、GPS技术和野外现场验证等多源信息手段和方法,进行成矿预测,高效、快速、经济地实现找矿靶区的预测与定位。  相似文献   

共轭伸展褶劈理夹角的定量解析   总被引：16，自引：0，他引：16  

何科昭  赵崇贺  乐昌硕  周正国  聂泽同  邰道乾  叶枬 《地学前缘》1999,6(4):0-0

９０ 年代初以来,中国地质学者先后在浙、皖、赣、湘的“板溪群”及震旦系中发现了古生代的生物化石。因此,再次将“板溪群”是否是前震旦纪的一个变质地层单位、江南古陆是否存在以及华南大地构造格局是否需要重新厘定等问题提了出来。１９９３ 年笔者于赣东北蛇绿混杂岩带内的“双桥山群”岩块中,首次发现了含晚古生代的放射虫硅质岩。１９９６ 年又在该混杂岩带多处的“双桥山群”岩块和“下震旦统志棠组”中找到了含晚古生代的放射虫硅质岩,还首次在“登山群拔竹坑组”中发现了早古生代的几丁虫化石。经数年野外多次观察和对室内化石鉴定、岩石地球化学测试结果以及岩石学特征的综合分析表明,所发现的含晚古生代放射虫硅质岩及其岩石组合是一套洋盆深水相沉积;登山群拔竹坑组,是早古生代的一套浅水陆棚 深水陆棚 半深海相沉积。结合同行学者在邻区“板溪群”研究方面取得的新成果,笔者认为：“板溪群”不是前震旦纪的一个变质地层单位,而是一个复杂的构造岩带,江南古陆是不存在的,华南从早古生代到中生代早期还经历了一次洋盆演化过程,现在的构造格局是印支运动奠定的  相似文献   

Synthesis and Characterization of β‐Cyclodextrin Nanosponge and Its Application for the Removal of p‐Nitrophenol from Water     

《洁净——土壤、空气、水》2017,45(10)

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Modélisation de propagation d’écoulement entre lits mineur et majeur sur les fleuves Sénégal et Niger     

Jean-Claude Bader  Gilles Belaud  Jean-Pierre Lamagat  Thibaud Ferret  Philippe Vauchel 《水文科学杂志》2017,62(3):447-466

In the Senegal River valley and Niger Inner Delta, the annual floods inundate a wide floodplain consisting of a complex network of lakes and channels, where topographic information needed by standard hydraulic models is difficult to obtain. To represent the flood propagation between mainstream and floodplain, we use a model designed for flood propagation in river mainstreams with flat bed and large overflow and without topographic data. Depending on the water level in the riverbed, the model calibrated on the levels observed at two stations gives the level in the floodplains and propagation time between stations. Several cases are tested for various types of hydraulic connections between mainstream and floodplain. The model could correctly reproduce the flood rise and fall in the floodplain, even for a lake connected by a single channel to the riverbed or in the case of a strong attenuation of the flood between very distant stations.  相似文献   

Development and validation of p‐y modeling approach for seismic response predictions of highway bridges          下载免费PDF全文

Yazhou Xie  Yili Huo  Jian Zhang 《地震工程与结构动力学》2017,46(4):585-604

This study aims to realistically simulate the seismic responses of typical highway bridges in California with considerations of soil–structure interaction effects. The p‐y modeling approaches are developed and validated for embankments and pile foundations of bridges. The p‐y approach models the lateral and vertical foundation flexibility with distributed p‐y springs and associated t‐z and q‐z springs. Building upon the existing p‐y models for pile foundations, the study develops the nonlinear p‐y springs for embankments based on nonlinear 2D and 3D continuum finite element analysis under passive loading condition along both longitudinal and transverse directions. Closed‐form expressions are developed for two key parameters, the ultimate resistant force p_ult and the displacement y₅₀, where 0.5p_ult is reached, of embankment p‐y models as functions of abutment geometry (wall width and height, embankment fill height, etc.) and soil material properties (wall‐soil friction angle, soil friction angle, and cohesion). In order to account for the kinematic and site responses, depth‐varying ground motions are derived and applied at the free‐end of p‐y springs, which reflects the amplified embankment crest motion. The modeling approach is applied to simulate the seismic responses of the Painter Street Bridge and validated through comparisons with the recorded responses during the 1992 Petrolia earthquake. It is demonstrated that the flexibility and motion amplification at end abutments are the most crucial modeling aspects. The developed p‐y models and the modeling approach can effectively predict the seismic responses of highway bridges. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

Casiofx-4800p计算器路线测量计算程序     

黄永明  李泽民 《化工矿产地质》2007,29(2):119-121

为了满足现场完成计算的需要,采用线路测量中桩、边桩放线的Casiofx-4800p计算器程序,运用该程序可以根据测量需要进行直线、圆曲线、缓和曲线中桩坐标和构筑物任意位置坐标计算,方便快捷,值得推广。  相似文献