Some properties such as oscillation, stability, existence of periodic solutions and quadratic integrability of solutions based on a class of second order nonlinear delayed systems are analyzed by using the V-function,...Some properties such as oscillation, stability, existence of periodic solutions and quadratic integrability of solutions based on a class of second order nonlinear delayed systems are analyzed by using the V-function, the Lyapunov functional or the Beuman-Bihari inequality, and some sufficient conditions based on those properties are given. Finally, the conclusions are applied to over-voltage models based on three-phase nonsynchronous closing of switches appearing in the power systems, the results in accord with the background physical meaning are obtained. And all the conditions of the conclusions are easy to validate, so the conclusions have definite theoretical meaning and are easy to apply in practice.展开更多
Simulations were carried out for studying the periodic phase separation of a symmetric binary polymer blend on the basis of Cahn-Hilliard-Cook theory. The time dependent interaction parameter x（τ） was assumed to un...Simulations were carried out for studying the periodic phase separation of a symmetric binary polymer blend on the basis of Cahn-Hilliard-Cook theory. The time dependent interaction parameter x（τ） was assumed to undergo a step-wise oscillation. The hierarchic structures composed of both large and small domains were obtained. The mechanism of the periodic formation of hierarchic structures was also demonstrated.展开更多
Long-period ground motion has become an important consideration because of the increasing number of large and long-period structures.Therefore,a thorough investigation on the formation and characteristics of longperio...Long-period ground motion has become an important consideration because of the increasing number of large and long-period structures.Therefore,a thorough investigation on the formation and characteristics of longperiod ground motion is desirable for engineering applications.In this work,an analytical study is performed to examine the effect of several parameters and the combining mode for equivalent harmonic components on the dynamic response of systems.The results of the work show that the harmonic components in equivalent ground motion are evidently influenced by the intensity rise time,duration,phase and combining mode.Moreover,the long-period ground motions are simplified and simulated by separate harmonic components through proper combination.The findings of the work are believed to be useful in the selection of input ground motion in structural seismic analysis.展开更多
In this paper, the dimension of the double periodic cubic C^1 spline space over non-uniform type-2 triangulations is determined and a local support basis is given.
Objective: To observe the therapeutic effects of peridural injection of Mailuoning Compound Liquor (脉络宁复合液) for prolapse of lumbar intervertebral disc (PLID). Methods: Peridural injection of Mailuoning Compound ...Objective: To observe the therapeutic effects of peridural injection of Mailuoning Compound Liquor (脉络宁复合液) for prolapse of lumbar intervertebral disc (PLID). Methods: Peridural injection of Mailuoning Compound Liquor (MCL) was given to 100 cases of PLID, once a week, 4 sessions constituting a therapeutic course. By adopting the scoring method, observations were carried out on the total therapeutic effect and changes in the 13 items of the symptoms and signs. Results: After treatment, the JOA scores in this series of patients were markedly enhanced as compared with the scores before treatment, showing significant differences in the paired t test (P<0.05). The sum of the excellent and good rates was 64%, and the total effective rate was 97%. All the scores in the 13 items under observation were significantly raised as compared with the scores before treatment (P<0.05). Conclusion: Peridural injection of MCL is an effective and safe therapy for PLID, and with shorter treating course, quicker therapeutic effects, and less suffering for the patients.展开更多
This paper is concerned with limit cycles which bifurcate from a period annulus of a quadratic reversible Lotka-Volterra system with sextic orbits.The authors apply the property of an extended complete Chebyshev syste...This paper is concerned with limit cycles which bifurcate from a period annulus of a quadratic reversible Lotka-Volterra system with sextic orbits.The authors apply the property of an extended complete Chebyshev system and prove that the cyclicity of the period annulus under quadratic perturbations is equal to two.展开更多
文摘Some properties such as oscillation, stability, existence of periodic solutions and quadratic integrability of solutions based on a class of second order nonlinear delayed systems are analyzed by using the V-function, the Lyapunov functional or the Beuman-Bihari inequality, and some sufficient conditions based on those properties are given. Finally, the conclusions are applied to over-voltage models based on three-phase nonsynchronous closing of switches appearing in the power systems, the results in accord with the background physical meaning are obtained. And all the conditions of the conclusions are easy to validate, so the conclusions have definite theoretical meaning and are easy to apply in practice.
文摘Simulations were carried out for studying the periodic phase separation of a symmetric binary polymer blend on the basis of Cahn-Hilliard-Cook theory. The time dependent interaction parameter x（τ） was assumed to undergo a step-wise oscillation. The hierarchic structures composed of both large and small domains were obtained. The mechanism of the periodic formation of hierarchic structures was also demonstrated.
基金Supported by Major Research Plan of National Natural Science Foundation of China(No.91215301)National Natural Science Foundation of China(No.51238012,No.51178152,No.51008208)the Special Fund for Earthquake Scientific Research in the Public Interest(No.201208013)
文摘Long-period ground motion has become an important consideration because of the increasing number of large and long-period structures.Therefore,a thorough investigation on the formation and characteristics of longperiod ground motion is desirable for engineering applications.In this work,an analytical study is performed to examine the effect of several parameters and the combining mode for equivalent harmonic components on the dynamic response of systems.The results of the work show that the harmonic components in equivalent ground motion are evidently influenced by the intensity rise time,duration,phase and combining mode.Moreover,the long-period ground motions are simplified and simulated by separate harmonic components through proper combination.The findings of the work are believed to be useful in the selection of input ground motion in structural seismic analysis.
文摘In this paper, the dimension of the double periodic cubic C^1 spline space over non-uniform type-2 triangulations is determined and a local support basis is given.
文摘Objective: To observe the therapeutic effects of peridural injection of Mailuoning Compound Liquor (脉络宁复合液) for prolapse of lumbar intervertebral disc (PLID). Methods: Peridural injection of Mailuoning Compound Liquor (MCL) was given to 100 cases of PLID, once a week, 4 sessions constituting a therapeutic course. By adopting the scoring method, observations were carried out on the total therapeutic effect and changes in the 13 items of the symptoms and signs. Results: After treatment, the JOA scores in this series of patients were markedly enhanced as compared with the scores before treatment, showing significant differences in the paired t test (P<0.05). The sum of the excellent and good rates was 64%, and the total effective rate was 97%. All the scores in the 13 items under observation were significantly raised as compared with the scores before treatment (P<0.05). Conclusion: Peridural injection of MCL is an effective and safe therapy for PLID, and with shorter treating course, quicker therapeutic effects, and less suffering for the patients.
基金Project supported by the National Natural Science Foundation of China(Nos.11226152,11201086)the Science and Technology Foundation of Guizhou Province(No.[2012]2167)+1 种基金the Foundation for Distinguished Young Talents in Higher Education of Guangdong(No.2012LYM_0087)the Talent Project Foundation of Guizhou University(No.201104)
文摘This paper is concerned with limit cycles which bifurcate from a period annulus of a quadratic reversible Lotka-Volterra system with sextic orbits.The authors apply the property of an extended complete Chebyshev system and prove that the cyclicity of the period annulus under quadratic perturbations is equal to two.
