研究两足机器人质量分布对步行ZMP(zero moment point)稳定阈度及步行效率的影响.采用稳定的参数化步态,在步态不变的情况下,改变机器人各连杆的质量分布,观察其对ZMP稳定阈度及步行效率的影响.仿真实验结果表明,合理选择大腿、小腿和...研究两足机器人质量分布对步行ZMP(zero moment point)稳定阈度及步行效率的影响.采用稳定的参数化步态,在步态不变的情况下,改变机器人各连杆的质量分布,观察其对ZMP稳定阈度及步行效率的影响.仿真实验结果表明,合理选择大腿、小腿和上身的质量分布可以显著增加ZMP稳定阈度和步行效率.展开更多
A scheme for switching of the optical bistability(OB) and multi-stability(OM) in a dielectric slab doped with a three-level ladder-configuration n-doped semiconductor quantum well is simulated. It is shown that the bi...A scheme for switching of the optical bistability(OB) and multi-stability(OM) in a dielectric slab doped with a three-level ladder-configuration n-doped semiconductor quantum well is simulated. It is shown that the bistable behavior of the system in dielectric slab can be controlled via amplitude or relative phase of applied fields. This optical system may provide some new possibilities for test the switching process.展开更多
In this paper, the sharp threshold properties of a （2n ＋ 1）-dimensional delayed viral infection model are investigated. This model combines with n classes of uninfected tar- get cells, n classes of infected cells a...In this paper, the sharp threshold properties of a （2n ＋ 1）-dimensional delayed viral infection model are investigated. This model combines with n classes of uninfected tar- get cells, n classes of infected cells and nonlinear incidence rate h（x,v）. Two kinds of distributed time delays are incorporated into the model to describe the time needed for infection of uninfected target cells and virus replication. Under certain conditions, it is shown that the basic reproduction number is a threshold parameter for the existence of the equilibria, uniform persistence, as well as for global stability of the equilibria of the model.展开更多
文摘研究两足机器人质量分布对步行ZMP(zero moment point)稳定阈度及步行效率的影响.采用稳定的参数化步态,在步态不变的情况下,改变机器人各连杆的质量分布,观察其对ZMP稳定阈度及步行效率的影响.仿真实验结果表明,合理选择大腿、小腿和上身的质量分布可以显著增加ZMP稳定阈度和步行效率.
文摘A scheme for switching of the optical bistability(OB) and multi-stability(OM) in a dielectric slab doped with a three-level ladder-configuration n-doped semiconductor quantum well is simulated. It is shown that the bistable behavior of the system in dielectric slab can be controlled via amplitude or relative phase of applied fields. This optical system may provide some new possibilities for test the switching process.
基金The authors would like to thank the anonymous referees and the editor for very helpful suggestions and comments which led to improvements of our orig- inal paper. J. Wang was supported by National Natural Science Foundation of China （Nos. 11401182 and 11471089）, Natural Science Foundation of Heilongjiang Province （No. A201415）, Science and Technology Innovation Team in Higher Edu- cation Institutions of Heilongjiang Province （No. 2014TD005）, Project funded by China Postdoctoral Science Foundation （No. 2014M552295） and Project funded by Chongqing Postdoctoral Foundation （No. Xm2014024）. X. Wang is supported by the National Natural Science Foundation of China （No. 11301453）, Postdoctoral Science Foundation of China （No. 2014M562366）, Postdoctoral Science Foundation of Shaanxi Province （No. 2014010）, the Universities Young Teachers Program of Henan Province （No. 2014GGJS-093）.
文摘In this paper, the sharp threshold properties of a （2n ＋ 1）-dimensional delayed viral infection model are investigated. This model combines with n classes of uninfected tar- get cells, n classes of infected cells and nonlinear incidence rate h（x,v）. Two kinds of distributed time delays are incorporated into the model to describe the time needed for infection of uninfected target cells and virus replication. Under certain conditions, it is shown that the basic reproduction number is a threshold parameter for the existence of the equilibria, uniform persistence, as well as for global stability of the equilibria of the model.
