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Dynamic responses of k-type and inverted-k-type jacket support structures for offshore wind-turbines

Journal of Central South University 2017年第4期24卷 947-956页

作者： LIAO Ying-di GUO Meng-yuan WANG Na HOU Li-jun CHEN Da key Laboratory of Coastal Disaster and Defence Ministry of Education (Hohai University) Nanjing 210098 China College of Harbor Coastal and Offshore Engineering Hohai University Nanjing 210098 China

The jacket structure has become more popular as the offshore wind-turbine support structure. k-type and inverted-k-type jacket support structures have superior potential due to their fewer joints and lower cost of manufacture and installation. A numerical study was presented on the dynamic responses of k-type and inverted-k-type jacket support structures subjected to different kinds of dynamic load. The results show that the inverted-k-type jacket structure has higher natural frequencies than the k-type. The wave force spectrum response shows that the maximum displacement of the k-type jacket structure is larger than that of the inverted-k-type. The time-history responses under wind and wave-current load indicate that the inverted-k-type jacket structure shows smaller displacement and stress compared with the k-type, and presents different stress concentration phenomena. The dynamic responses reveal that the inverted-k-type of jacket support structure has greater stiffness and superior mechanical properties, and thus is more applicable in the offshore area with relatively deep water.

关键词： jacket support structure k-type inverted-k-type foundation dynamic responses

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Control over hysteresis curves and thresholds of optical bistability in different semiconductor double quantum wells

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Chinese Physics B 2015年第8期24卷 373-380页

作者： Hamedi H R Mehmannavaz M R Afshari Hadi Institute of Theoretical Physics and Astronomy Vilnius University Young Researchers and Elite Club Mashhad Branch Islamic Azad University Research Institute for Applied Physics University of Tabriz

The effects of optical field on the phenomenon of optical bistability(OB) are investigated in a k-type semiconductor double quantum well(SDQW) under various parametric conditions. It is shown that the OB threshold can be manipulated by increasing the intensity of coupling field. The dependence of the shift of OB hysteresis curve on probe wavelength detuning is then explored. In order to demonstrate controllability of the OB in this SDQW, we compare the OB features of three different configurations which could arise in this SDQW scheme, i.e., k-type, Y-type, and inverted Y-type systems. The controllability of this semiconductor nanostructure medium makes the presented OB scheme more valuable for applications in all-optical switches, information storage, and logic circuits of all optical information processing.

关键词： optical bistability semiconductor double quantum wells k-type Y-type and inverted Y-type schemes OB threshold intensity

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Dirac cohomology of unitary representations of equal rank exceptional groups

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Science China Mathematics 2007年第4期50卷 515-520页

作者： Fu-hai ZHU ke LIANG School of Mathematical Sciences and LPMC Nankai UniversityTianjin 300071China

In this paper, we consider the unitary representations of equal rank exceptional groups of type E with a regular lambda-lowest k-type and classify those unitary representations with the nonzero Dirac cohomology.

关键词： Dirac cohomology unitary representation k-type exceptional group 22E46 22E47

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