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高强度大六角头螺栓连接副扭矩系数测定方法
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作者 戴雅康 张忠光 《起重机》 2000年第3期26-27,共2页
本文阐述了高强度大六角头螺栓连接副据矩系数的意义及表达式,对据矩系数的要求及其测定方法。
关键词 六角头螺栓 螺栓连接副 据矩系数 测定方法
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Shell Model Description of Neutron-Deficient Sn Isotopes
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作者 Erdal Dikmen 《Communications in Theoretical Physics》 SCIE CAS CSCD 2009年第5期899-903,共5页
The shell model calculations in the sdgh major shell for the neutron-deficient ^106,107,108,109Sn isotopes have been carried out by using CD-Bonn and Nijmegenl two-body effective nucleon-nucleon interactions. The sing... The shell model calculations in the sdgh major shell for the neutron-deficient ^106,107,108,109Sn isotopes have been carried out by using CD-Bonn and Nijmegenl two-body effective nucleon-nucleon interactions. The singleshell states and the corresponding matrix elements needed for describing Sn isotopes are reconstructed to calculate the coefficient of fractional parantage by reducing the calculation requirements. This reconstruction allows us to do the shell model calculations of the neutron deficient Sn isotopes in very reasonable time. The results are compared to the recent high-resolution experimental data and found to be in good agreement with experiments. 展开更多
关键词 shell model low-lying states effective interactions
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A formal structure for symbolic reachability analysis of rectangular hybrid systems
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作者 ZHANG HaiBin ZHAO Cheng LI Rong 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2016年第2期347-356,共10页
For symbolic reachability analysis of rectangular hybrid systems, the basic issue is finding a formal structure to represent and manipulate its infinite state spaces. Firstly, this structure must be closed to the reac... For symbolic reachability analysis of rectangular hybrid systems, the basic issue is finding a formal structure to represent and manipulate its infinite state spaces. Firstly, this structure must be closed to the reachability operation which means that reachable states from states expressed by this structure can be presented by it too. Secondly, the operation of finding reachable states with this structure should take as less computation as possible. To this end, a constraint system called rectangular zone is formalized, which is a conjunction of fixed amount of inequalities that compare fixed types of linear expressions with two variables to rational numbers. It is proved that the rectangular zone is closed to those reachability operations-intersection, elapsing of time and edge transition. Since the number of inequalities and the linear expression of each inequality is fixed in rectangular zones, so to obtain reachable rectangular zones, it just needs to change the rational numbers to which these linear expressions need to compare. To represent rectangular zones and unions of rectangular zones, a data structure called three dimensional constraint matrix(TDCM) and a BDD-like structure rectangular hybrid diagram(RHD) are introduced. 展开更多
关键词 rectangular hybrid systems symbolic methods reachability analysis
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