Fluorescence interferometry is developed and applied to study ultrafast amplitude and phase dynamics for fleeinduction decay in powdered rare earth solids. The time-resolved phase dynamics of free-induction decay thro...Fluorescence interferometry is developed and applied to study ultrafast amplitude and phase dynamics for fleeinduction decay in powdered rare earth solids. The time-resolved phase dynamics of free-induction decay throughout the decaying process is accurately determined by using a novel dual-channel correlation technique and subpicosecond dephasing time is measured for Nd3+ solids at room temperature. The phase dynamics is well simulated with linear coherent polarization theory.展开更多
Place spirit originates from ancient Rome, and emphasizes whole fusion of objective material environment and subjective consciousness. The introduction of "place spirit" concept in protection work of old tow...Place spirit originates from ancient Rome, and emphasizes whole fusion of objective material environment and subjective consciousness. The introduction of "place spirit" concept in protection work of old town is conducive to further understanding complex relationship between reconstruction of objective material environment and reappearance of traditional culture connotation. The street of Hekou Town of Qianshan is historical one, and its protection and planning are conducting. The street is full of rich marketplace breath and has certain feature. In this paper, started from protection status quo of Hekou Town, we preliminarily discuss how to effectively pass historical information in the protection process and maintain place spirit of old town in modern living environment.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.29673058Ministry of Education under GrantNo.97055803and Natural Science Foundation of Guangdong under Grant No.970146.
文摘Fluorescence interferometry is developed and applied to study ultrafast amplitude and phase dynamics for fleeinduction decay in powdered rare earth solids. The time-resolved phase dynamics of free-induction decay throughout the decaying process is accurately determined by using a novel dual-channel correlation technique and subpicosecond dephasing time is measured for Nd3+ solids at room temperature. The phase dynamics is well simulated with linear coherent polarization theory.
文摘Place spirit originates from ancient Rome, and emphasizes whole fusion of objective material environment and subjective consciousness. The introduction of "place spirit" concept in protection work of old town is conducive to further understanding complex relationship between reconstruction of objective material environment and reappearance of traditional culture connotation. The street of Hekou Town of Qianshan is historical one, and its protection and planning are conducting. The street is full of rich marketplace breath and has certain feature. In this paper, started from protection status quo of Hekou Town, we preliminarily discuss how to effectively pass historical information in the protection process and maintain place spirit of old town in modern living environment.