A model oscillator of irregular stellar variability     

Y. Tanaka  M. Takeuti 《Astrophysics and Space Science》1988,148(2):229-237

We have studied a set of equations with nonlinear and nonadiabatic terms which describes a simple oscillator. The equations have only one fixed point located at the origin. It is found that the oscillator shows the sequence of the period-doubling for the change of a parameter and results in chaotic oscillation. We illustrated the behaviour of the oscillator for several set of parameters and showed that the equations of the oscillator can be reduced to the one-zone model of stellar pulsation with simple nonlinear terms. It is suggested that the stellar irregular variability is resulted from the chaotic motion due to the nonlinear effect.  相似文献   

The coupling coefficients of radial pulsation in third order     

T. Ishida  R. Takano  F. Yamakawa  M. Takeuti 《Astrophysics and Space Science》1993,210(1-2):349-349

The third order theory of coupling is discussed regarding the radial pulsation of stellar models.  相似文献   

太白双王含金水压角砾岩体形成过程和金矿体预测   总被引：8，自引：0，他引：8       下载免费PDF全文

汪劲草  汤静如等 《地质论评》2001,47(5):508-513

陕西双王含金角砾岩体为水压角砾岩体，是深源富碱含金流体使泥盆系一套热水沉积的富钠质岩系发生水力压裂作用形成的。早期共轴递进挤压使能干性富钠质岩系与非能干性富泥质岩系发生变形分离，分别形成近等距分布的透镜状弱变形域与线性强变形带，其中，弱变形域中央是一个相对低温，低压，高渗透率的透镜状天然泵吸中心；晚期的右旋高角度斜冲非共轴递进剪切使弱变形域中央最发育的一组节理和裂隙由压性转变为张性，并沟通溶 部的裂隙系统，泵吸中心巨大的压力降使深部的承压流体在富钠质岩系中产生周期性的构造泵吸一水力压裂－沉淀愈合作用，根据分解变形构造型式预测的隐伏含金水压角砾岩体已获钻探初步验证。  相似文献   

保和堂矿区龙潭组下三角洲平原聚煤特征     

莫时旭  许桂生 《湖南地质》1997,16(4):227-231

邵东保和堂矿区龙潭组１，２煤形成地下三角洲平原废弃期，３煤形成于三角洲建设期，前者聚煤条件较好。在三角洲废弃破坏期，潮汐水流对形成于三角洲平原的煤层有较强的发行作用。本文提出了潮汐对煤厚，煤质及煤岩组成的作用机制。  相似文献   

新化古台山金锑矿床蚀变特征及其找矿方向   总被引：3，自引：0，他引：3  

余建国 《湖南地质》1998,17(3):155-159

本文结合古台山金锑矿床地质特征,着重分析了围岩蚀变类型及其分带,分布规律与矿化的关系,阐述了围岩蚀变特征及其找矿意义。  相似文献   

A Candidate Global Stratotype Section and Point for the Precambrian——Cambrian Boundary at Meishucun,Yunnan,China     

Xing Yusheng The Geological Museum of China  Beijing Luo Huilin Jiang Zhiwen Yunnan Institute of Geological Sciences  Kunming  Yunnan Zhang Shishan Kunyang Phosphorite Mine  Jinning  Yunnan 《中国地质大学学报(英文版)》1991,(1)

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狮子山矿田矽卡岩型金矿铋矿物与金矿化关系研究   总被引：9，自引：0，他引：9  

任云生  刘连登  万相宗  陈国华 《矿物岩石》2004,24(2):41-45

包村和朝山金矿床位于安徽铜陵狮子山矿田，成因上属于矽卡岩型金矿。矿相学鉴定和电子探针分析结果表明，两矿床中的铋矿物以自然铋、辉铋矿为主，其次为碲铋矿、硫铜铋矿、辉铋铅矿等；铋矿物作为主要载金矿物．与自然金紧密共生；包村矿区Bi-Au相关系数为0．69，铋矿物与金矿化关系非常密切。成矿流体相分离引起的热液硫逸度fs2降低，可能是黑铋金矿分解成金和铋，并最终导致金与铋矿物密切共生的主要原因。  相似文献   

The 2013 European Seismic Hazard Model: key components and results   总被引：11，自引：5，他引：6  

Jochen Woessner  Danciu Laurentiu  Domenico Giardini  Helen Crowley  Fabrice Cotton  Gottfried Grünthal  Gianluca Valensise  Ronald Arvidsson  Roberto Basili  Mine Betül Demircioglu  Stefan Hiemer  Carlo Meletti  Roger W. Musson  Andrea N. Rovida  Karin Sesetyan  Massimiliano Stucchi  The SHARE Consortium 《Bulletin of Earthquake Engineering》2015,13(12):3553-3596

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A probabilistic seismic hazard assessment for the Turkish territory: part II—fault source and background seismicity model     

Mine Betül Demircioğlu  Karin Şeşetyan  Tamer Y. Duman  Tolga Çan  Senem Tekin  Semih Ergintav 《Bulletin of Earthquake Engineering》2018,16(8):3399-3438

Over the years, several local and regional seismic hazard studies have been conducted for the estimation of the seismic hazard in Turkey using different statistical processing tools for instrumental and historical earthquake data and modeling the geologic and tectonic characteristics of the region. Recently developed techniques, increased knowledge and improved databases brought the necessity to review the national active fault database and the compiled earthquake catalogue for the development of a national earthquake hazard map. A national earthquake strategy and action plan were conceived and accordingly with the collaboration of the several institutions and expert researchers, the Revision of Turkish Seismic Hazard Map Project (UDAP-Ç-13-06) was initiated, and finalized at the end of 2014. The scope of the project was confined to the revision of current national seismic hazard map, using the state of the art technologies and knowledge of the active fault, earthquake database, and ground motion prediction equations. The following two seismic source zonation models are developed for the probabilistic earthquake hazard analysis: (1) Area source model, (2) Fault and spatial smoothing seismic source model (FSBCK). In this study, we focus on the development and the characterization of the Fault Source model, the background spatially smoothed seismicity model and intrinsic uncertainty on the earthquake occurrence-rates-estimation. Finally, PSHA results obtained from the fault and spatial smoothed seismic source model are presented for 43, 72, 475 and 2475 years return periods (corresponding to 69, 50, 10, and 2% probability of exceedance in 50 years) for PGA and 5% damped spectral accelerations at 0.2 and 1.0 s.  相似文献   

Seismic hazard map of the Middle East     

Domenico Giardini  Laurentiu Danciu  Mustafa Erdik  Karin Şeşetyan  Mine B. Demircioğlu Tümsa  Sinan Akkar  Levent Gülen  Mehdi Zare 《Bulletin of Earthquake Engineering》2018,16(8):3567-3570

The collaborative project Earthquake Model of the Middle East (EMME, 2010–2015) brought together scientists and engineers from the leading research institutions in the region and delivered state-of-the-art seismic hazard assessment covering Afghanistan, Armenia, Azerbaijan, Cyprus, Georgia, Iran, Iraq, Jordan, Lebanon, Palestine, Pakistan, Syria and Turkey. Their efforts have been materialized in the first homogenized seismic hazard model comprising earthquake catalogues, mapped active faults, strong motions databank, ground motion models and the estimated ground motion values for various intensity measure types and relevant return periods (e.g. 475–5000 years). The reference seismic hazard map of the Middle East, depicts the mean values of peak ground acceleration with a 10% chance of exceedance in 50 years, corresponding to a mean return period of 475 years. A full resolution poster is provided with this contribution.  相似文献