A Model for Contact Binary Systems     

Han-Feng Song Run-Qian Huang Shao-Lan Bi 《中国天文和天体物理学报》2007,7(4):539-550

A model for contact binary systems is presented, which incorporates the following special features: a) The energy exchange between the components is based on the understand-ing that the energy exchange is due to the release of potential, kinetic and thermal energies of the exchanged mass. b) A special form of mass and angular momentum loss occurring in contact binaries is losses via the outer Lagrangian point. c) The effects of spin, orbital rota-tion and tidal action on the stellar structure as well as the effect of meridian circulation on the mixing of the chemical elements are considered. d) The model is valid not only for low-mass contact binaries but also for high-mass contact binaries. For illustration, we used the model to trace the evolution of a massive binary system consisting of one 12M and one 5M star. The result shows that the start and end of the contact stage fall within the semi-detached phase during which the primary continually transfers mass to the secondary. The time span of the contact stage is short and the mass transfer rate is very large. Therefore, the contact stage can be regarded as a special part of the semi-detached phase with a large mass transfer rate. Both mass loss through the outer Lagrangian point and oscillation between contact and semi-contact states can occur during the contact phase, and the effective temperatures of the primary and the secondary are almost equal.  相似文献   

Quantitative Tectonic Markers of Large Coastal Earthquakes in Fujian, Guangdong, Taiwan and Hainan——with a Discussion of Qualitative Indicators     

Bi Fuzhi Yuan Youshen Institute of Crustal Dynamics  State Seismological Bureau  Beijing 《《地质学报》英文版》1997,71(4):395-406

This paper expounds the quantitative tectonic indicators and some qualitative indicators of large earthquakes in the coast areas of Fujian, Guangdong, Taiwan and Hainan. The main quantitative indicators include uplift amplitude of the Moho, Quaternary and Late Holocene coasts. The paper also gives a brief account of the research method on quantitative indicators of surface uplifted zones. Taiwan is a famous neotectonic zone and an area of large earthquakes in the world. There is only one large-earthquake area in each of Fujian, Guangdong and Hainan Provinces. Along the coast large earthquake areas there are certainly many remains of crustal activity. Among these remains, coast activity, taking the sea level as the accurate marker horizon, can determine not only the amplitude of coastal elevation and subsidence in a certain period, but also the cycle and rate of positive or negative movements.  相似文献   

复杂地震系统的数字模拟     

郑兆Bi  刘杰 《地震》1996,16(4):347-354

借用细胞自动机的计算处理方法，对地震孕育过程中整个系统能量输入，积累，释放，传播等进行了数字模拟，并研究了复杂地震系统的整体特征，结果表明，整体调整系统，地震时能量的损耗系数，外部构造应力场的驱动力大小会影响到地震系统中能量积累和释放的状况，影响到Ｇ－Ｒ关系中ｂ值的大小。  相似文献   

实际地震序列和模拟地震序列的震级—频度关系   总被引：1，自引：0，他引：1  

郑兆Bi 《华北地震科学》1996,14(3):74-80

通过对实际观测的地震序列和由复杂地震系统模型产生的的模拟地震序列的分析，认为在整个震级段上粗略地看基本上符合古登堡－李希特经验关系式。仔细分析不同的震级段，ｂ值是差异的，这与孕震体的内在特性有关。这一认识对理论地震孕育的复杂性，认识地震孕育中共性与特性的关系是有启发性的。  相似文献   

地电阻率震兆异常可信度     

郑兆bi 《地震》1989,(6):20-27

本文通过总结震例经验,以地电分析预报人员的分析思路为基础,将概率统计、模糊识别、专家系统中的不精确推理基本原则相结合,给出了地电阻率震兆异常可信度,用它表示“某道测线出现了地电阻率异常后将会发生中强以上地震”这一结论的可信程度。这一信度是地电阻率单个异常可靠程度的一个综合定量化标准,也可将其作为地震预报专家系统综合预报推理的最基本定量参数。  相似文献   

GRANITOIDS AND TETONIC EVOLUTION OF THE WEST KUNLUN OROGENIC BELT     

Wang Yuanlong  Bi Hua  Wang Zhonggang  Zhu Xiaoqing 《地学前缘》2000,(Z1)

GRANITOIDS AND TETONIC EVOLUTION OF THE WEST KUNLUN OROGENIC BELT  相似文献   

全国年度地震重点危险区与地震相关性的统计模拟分析   总被引：4，自引：0，他引：4       下载免费PDF全文

郑兆 《地震学报》2000,22(5):538-546

用统计模拟的方法对1990～1997年全国年度重点危险区与地震的相关性进行了分析．由于统计模拟的方法有效地处理了地震和危险区的时空不均匀性,并且得到经运算105 次的统计模拟随机预报概率,将其与实际预报平均概率比较,得到较为客观的结果．结果表明:① 1990～1997年全国年度重点危险区的实际预报平均概率,比完全平均随机划定预报区的统计模拟平均随机概率高0.03719;② 考虑地震活动背景概率时,实际预报平均概率比危险区加权重的统计模拟平均概率高0.02183;③ 将中国大陆依地震分布不均匀性分为新疆西部地区、西南地区和其它地区３个区时,新疆西部地区的实际预报平均概率大大高出统计模拟平均随机概率,其差值为0.20962．   相似文献   

Copper partitioning between granitic silicate melt and coexisting aqueous fluid at 850 °C and 100 MPa     

Shuilong Wang  Hui Li  Linbo Shang  Xianwu Bi  Xinsong Wang  Wenlin Fan 《中国地球化学学报》2016,35(4):381-390

Experiments on the partitioning of Cu between different granitic silicate melts and the respective coexisting aqueous fluids have been performed under conditions of 850 °C, 100 MPa and oxygen fugacity（f O₂） buffered at approaching Ni–Ni O（NNO）. Partition coefficients of Cu（DCu= cfluid/cmelt） were varied with different alumina/alkali mole ratios [Al₂O₃/（Na₂O·K₂O）, abbreviated as Al/Alk], Na/K mole ratios, and Si O₂ mole contents. The DCu increased from 1.28 ± 0.01 to 22.18 ± 0.22 with the increase of Al/Alk mole ratios（ranging from 0.64 to 1.20）and Na/K mole ratios（ranging from 0.58 to 2.56）. The experimental results also showed that DCuwas positively correlated with the HCl concentration of the starting fluid.The DCuwas independent of the Si O₂ mole content in the range of Si O₂ content considered. No DCuvalue was less than 1 in our experiments at 850 °C and 100 MPa, indicating that Cu preferred to enter the fluid phase rather than the coexisting melt phase under most conditions in the melt-fluid system, and thus a significant amount of Cu could be transported in the fluid phase in the magmatichydrothermal environment. The results indicated that Cu favored partitioning into the aqueous fluid rather than themelt phase if there was a high Na/K ratio, Na-rich, peraluminous granitic melt coexisting with the high Cl-fluid.  相似文献   

霍山窗与华东中强地震关系研究   总被引：10，自引：0，他引：10  

郑必Bi  庆梅 《地震学刊》1999,(2):1-9

分析了１９７２￣１９９７年霍山窗小震的资料,研究了小震月频次、小震空间分布、Ｐ轴取向、Ｐ波初动等特征。认为当霍山窗小震月频次增高超过４０次时应注意３个月内华东地区在佛子岭东北或西南方向５００ｋｍ内可能发生中强地震。未来地震的大小、距离和方位与震群中的最大震级及佛子岭台记录到的Ｐ波初动符号的一致性和空间特征有关。  相似文献   

前兆异常与地震相关性研究——一个值得广大地震学者重视的问题     

郑兆Bi  黄显良 《地震学刊》1998,(4):10-13

简要介绍了前兆异常与地震相关性定量分析方法,并列举了在进行这方面研究中目前存在的薄弱环节和困难,以期引起广大地震分析预报人员的重视。  相似文献