A new diarylheptanoid glycoside, 1,7-bis-（3,4-dihydroxyphenyl）-5-hydroxyheptane- 3-O-β-D-xylopyranoside （1）, together with nine known diarylheptanoids （2-10） were isolated from the fresh bark of Alnus japonica ...A new diarylheptanoid glycoside, 1,7-bis-（3,4-dihydroxyphenyl）-5-hydroxyheptane- 3-O-β-D-xylopyranoside （1）, together with nine known diarylheptanoids （2-10） were isolated from the fresh bark of Alnus japonica which is a species of the genus Alnus species, growing throughout Korea.展开更多
Intermittent dynamics switching on the route to chaos in a discrete-mode laser with long time-delayed feedback is experimentally and numerically studied by analyzing the time series,power spectra,and phase portraits. ...Intermittent dynamics switching on the route to chaos in a discrete-mode laser with long time-delayed feedback is experimentally and numerically studied by analyzing the time series,power spectra,and phase portraits. The results show two types of dynamics switching:one or multiple times regular intermittent dynamics switching between stable state and square-wave envelope period-one oscillation within one feedback round time,and the irregular intermittent dynamics switching between stable state and quasi-periodic or multi-states or chaos with higher feedback ratio and bias currents. The relationship between the duty cycle of period-one oscillation and the feedback ratio has been analyzed. The map of the dynamics distribution in the parameter space of feedback ratio and bias current is plotted for a better understanding of dynamics evolution in long external cavity discrete-mode lasers.展开更多
文摘A new diarylheptanoid glycoside, 1,7-bis-（3,4-dihydroxyphenyl）-5-hydroxyheptane- 3-O-β-D-xylopyranoside （1）, together with nine known diarylheptanoids （2-10） were isolated from the fresh bark of Alnus japonica which is a species of the genus Alnus species, growing throughout Korea.
基金European Regional Development Fund (2017/COL/007,82085)。
文摘Intermittent dynamics switching on the route to chaos in a discrete-mode laser with long time-delayed feedback is experimentally and numerically studied by analyzing the time series,power spectra,and phase portraits. The results show two types of dynamics switching:one or multiple times regular intermittent dynamics switching between stable state and square-wave envelope period-one oscillation within one feedback round time,and the irregular intermittent dynamics switching between stable state and quasi-periodic or multi-states or chaos with higher feedback ratio and bias currents. The relationship between the duty cycle of period-one oscillation and the feedback ratio has been analyzed. The map of the dynamics distribution in the parameter space of feedback ratio and bias current is plotted for a better understanding of dynamics evolution in long external cavity discrete-mode lasers.
