[目的/意义]在定义论文引文和专利引文的引用时滞和循环周期基础上,探讨了富勒烯研究的引用时滞和循环周期及其随时间变化趋势。[方法/过程]采用引文分析法,数据来源自Web of Science中有关富勒烯研究的引文数据。[结果/结论]结果揭示...[目的/意义]在定义论文引文和专利引文的引用时滞和循环周期基础上,探讨了富勒烯研究的引用时滞和循环周期及其随时间变化趋势。[方法/过程]采用引文分析法,数据来源自Web of Science中有关富勒烯研究的引文数据。[结果/结论]结果揭示富勒烯研究的专利引文和论文引文的引用时滞基本一致,而科学循环周期平均小于技术循环周期,但二者之间的差距在逐年减小。展开更多
In this paper, we consider a Cohen-Grossberg neural network with three delays. Regard- ing time delays as a parameter, we investigate the effect of time delays on its dynamics. We show that there exist stability switc...In this paper, we consider a Cohen-Grossberg neural network with three delays. Regard- ing time delays as a parameter, we investigate the effect of time delays on its dynamics. We show that there exist stability switches for time delays under certain conditions and the conditions for the existence of periodic oscillations are given by discussing the associated characteristic equation. Numerical simulations are given to illustrate the obtained results and interesting network behaviors are observed, such as multiple stability switches of the network equilibrium and synchronous (asynchronous) oscillations.展开更多
文摘[目的/意义]在定义论文引文和专利引文的引用时滞和循环周期基础上,探讨了富勒烯研究的引用时滞和循环周期及其随时间变化趋势。[方法/过程]采用引文分析法,数据来源自Web of Science中有关富勒烯研究的引文数据。[结果/结论]结果揭示富勒烯研究的专利引文和论文引文的引用时滞基本一致,而科学循环周期平均小于技术循环周期,但二者之间的差距在逐年减小。
文摘In this paper, we consider a Cohen-Grossberg neural network with three delays. Regard- ing time delays as a parameter, we investigate the effect of time delays on its dynamics. We show that there exist stability switches for time delays under certain conditions and the conditions for the existence of periodic oscillations are given by discussing the associated characteristic equation. Numerical simulations are given to illustrate the obtained results and interesting network behaviors are observed, such as multiple stability switches of the network equilibrium and synchronous (asynchronous) oscillations.