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Adjustment time of the first baroclinic Rossby wave in the global oceans
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作者 FAN Haimei LI Bingrui +2 位作者 XU Ren ZHANG Zhenglong LI Yihong 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2006年第6期15-21,共7页
According to the freely linear Rossby wave theory, global 1°×1°climatology of Rossby deformation radius and phase speed are studied under the fiat bottom fluid approximation. Geographical variations in ... According to the freely linear Rossby wave theory, global 1°×1°climatology of Rossby deformation radius and phase speed are studied under the fiat bottom fluid approximation. Geographical variations in the contours of the phase speed are very similar to those of the Rossby radius of formation, which are mainly affected by stratification, rotation, water depth, topography, etc. The basin-crossing time of the first baroclinic Rossby wave is obtained and analyzed in the global ocean basins. The results are useful to learn the importance of Rosaby wave and the adiabatic adjustment of large-scale ocean circulation. 展开更多
关键词 first baroclinic Rossby wave global Rossby adjustment adjustment time
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Trajectory tracking and obstacle avoidance method for robots based on fast terminal sliding mode 被引量:4
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作者 CAO Zhi-bin YANG Wei +1 位作者 SHAO Xing-ling LIU Ning 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2020年第1期78-86,共9页
For accurate trajectory tracking and obstacle avoidance in finite time of a nonholonomic mobile robot,a trajectory tracking controller based on global fast terminal sliding mode method is proposed,which has the advant... For accurate trajectory tracking and obstacle avoidance in finite time of a nonholonomic mobile robot,a trajectory tracking controller based on global fast terminal sliding mode method is proposed,which has the advantages of chattering-free and adjustable convergence time.First of all,the kinematics model of the robot is established in mobile carrier coordinates.Secondly,the global structure including terminal attractor and exponential convergence of the fast terminal sliding mode trajectory tracking controller is proved by Lyapunov stability theory,ensuring that the trajectory and heading angle tracking error converges to a smaller zero range in finite time.Finally,the artificial potential field obstacle avoidance method is introduced to make the robot not only track the reference trajectory strictly,but also avoid the obstacles.The simulation results show that the proposed method can achieve a stable tracking control in finite time for a given reference trajectory. 展开更多
关键词 trajectory tracking global fast terminal sliding mode adjustable convergence time chattering free artificial potential field method
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Research on Adjust Time of Premium
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作者 Rong, Ximin Zhang, Shiying 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2000年第2期1-4,共4页
By considering economic strength and economic profit of insurance company, this paper presents a concept-contact point, and gives premium expectation adjust-time model which provides more practical significance for in... By considering economic strength and economic profit of insurance company, this paper presents a concept-contact point, and gives premium expectation adjust-time model which provides more practical significance for insurance company to make rational adjustment of premium. Finally, an illustration is given to show their application. 展开更多
关键词 Contact point EXPECTATION Adjust time ASSETS
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AN EXPLICIT COMPLETE SQUARE CONSERVATIVE SCHEME WITH ADJUSTABLE TIME INTERVALS
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作者 王斌 季仲贞 《Acta meteorologica Sinica》 SCIE 1994年第4期403-409,共7页
In this paper,a kind of explicit difference scheme to solve nonlinear evolution equations,perfectly keeping the square conservation by adjusting the time step interval,is constructed,from the comprehensive maintenance... In this paper,a kind of explicit difference scheme to solve nonlinear evolution equations,perfectly keeping the square conservation by adjusting the time step interval,is constructed,from the comprehensive maintenance of the ad- vantages of the implicit complete square conservative scheme and the explicit instantaneous square conservative scheme. The new schemes are based on the thought of adding a small dissipation,but it is different from the small dissipation method.The dissipative term used in the new schemes is not a simple artificial dissipative term,but a so-called (time) harmonious dissipative term that can compensate for the truncation errors from the dissociation of the time differential term.Therefore,the new schemes may have a high time precision and may acquire a satisfactory effect in numerical tests. 展开更多
关键词 adjustable time interval explicit scheme square conservation harmonious dissipation
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