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一种确定模拟的行星际MHD激波局地参数的新方法 被引量:2
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作者 向长青 王敬芳 +2 位作者 魏奉思 黄为民 熊东辉 《空间科学学报》 CAS CSCD 北大核心 2002年第1期6-12,共7页
简要阐述了分析模拟的行星际磁流体力学(MHD)激波的局部性质时,采用无厚度局部平面激波这一假设的合理性,说明了在激波未扰动区域(激波上游),物理量在几个小时内的变化很小这一事实.利用平面激波的分析方法,提出了分析模拟... 简要阐述了分析模拟的行星际磁流体力学(MHD)激波的局部性质时,采用无厚度局部平面激波这一假设的合理性,说明了在激波未扰动区域(激波上游),物理量在几个小时内的变化很小这一事实.利用平面激波的分析方法,提出了分析模拟的行星际MHD 激波的新方法,包括激波位置的确定,上下游状态参数的选择,激波局部参数的计算以及激波的分类,最后应用这种方法对一个二维的MHD模拟结果进行了分析.结果证实了过去文献关于磁流体力学混合激波空间连接和时间演化的链式规则,而且说明位于太阳赤道附近的慢激波和中间激波最终会发展为快激波. 展开更多
关键词 行星际模拟MHD激波 局地参数 流体力学 日冕物质抛射事件
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Existence and Uniqueness of the Nonlinear BSDEs with a Small Parameter under Locally Lipschitz Condition 被引量:1
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作者 XIE Zhen-yun XIA Ning-mao 《Chinese Quarterly Journal of Mathematics》 CSCD 2010年第3期344-351,共8页
In this paper we study the following nonlinear BSDE:y(t) + ∫1 t f(s,y(s),z(s))ds + ∫1 t [z(s) + g 1 (s,y(s)) + εg 2 (s,y(s),z(s))]dW s=ξ,t ∈ [0,1],where ε is a small parameter.The coeffi... In this paper we study the following nonlinear BSDE:y(t) + ∫1 t f(s,y(s),z(s))ds + ∫1 t [z(s) + g 1 (s,y(s)) + εg 2 (s,y(s),z(s))]dW s=ξ,t ∈ [0,1],where ε is a small parameter.The coefficient f is locally Lipschitz in y and z,the coefficient g 1 is locally Lipschitz in y,and the coefficient g 2 is uniformly Lipschitz in y and z.Let L N be the locally Lipschitz constant of the coefficients on the ball B(0,N) of R d × R d×r.We prove the existence and uniqueness of the solution when L N ~ √ log N and the parameter ε is small. 展开更多
关键词 nonlinear BSDE locally Lipschitz condition a small parameter
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Cluster of Strong Earthquakes and Aftershocks in Ahar-Varzeghan Area on August 11, 2012
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作者 Ebad Ghanbari Ahmadi Mashinchi Arash Valizadeghan Arjmand Sadegh 《Journal of Civil Engineering and Architecture》 2015年第7期869-874,共6页
Seismic events are very complex spatial-temporal phenomena. Seismic catalogues, reporting information about spatial-temporal distribution of the main shocks, are nowadays available for many seismic areas in the world,... Seismic events are very complex spatial-temporal phenomena. Seismic catalogues, reporting information about spatial-temporal distribution of the main shocks, are nowadays available for many seismic areas in the world, very often major events mark the beginning of a series of earthquakes (aflershocks) whose frequency and energy are meanly decreasing in time down to the background level of activity. Azerbaijan is one of the most active segments of the Alpine-Himalayan seismic belt and marks the junction between the African-Arabian and Indian plate to the south, and Eurasian plate to the north. The cluster of earthquakes that struck near Varzeghan-Ahar was centered near the Gosha-Dagh fault, but preliminary data suggested that the fault was not responsible for the temblor. On the late afternoon of Saturday, August 11, 2012, the northwest of Iran was shaken by two of the strong earthquakes in Iranian history. First was hit by Mw (moment magnitude scale) = 6.4 Richter at local time 16:54 (12:23 GMT (Greenwich Mean Time)), and about 11 min later, an Mw = 6.3 struck 10 km to the west. The spatial-temporal clustering of micro earthquakes (aftershocks) near Varzeghan, is parameterized by means of a generalized passion model. The region has known faults but numerous smaller or deeply buried faults remain undated, according to the Geological Survey of Iran. 展开更多
关键词 Ahar-Varzeghan cluster of strong earthquakes AFTERSHOCKS strike-slip fault.
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