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Adjustable wavelength and lifetime in Mn4+ ion doped phosphate glasses
Chengguo Ming,Hanxiong Liu,Feng Song,Xiaobin Ren,Liqun An,Yanming Hao,Gangzhi Wang 한국물리학회 2013 Current Applied Physics Vol.13 No.6
Phosphate glasses doped with Mn4þ ion were prepared using high temperature melting method. Under 408 nm excitation, the peak wavelength and lifetime of the fluorescence are related to the Mn4þ ion concentration. With the increasing of Mn4þ ion concentration, the fluorescence wavelength varies from 605 nm to 685 nm and the lifetime increases from several microseconds to one millisecond. The fluorescence wavelength is variable and the lifetime is tunable for our materials.
GPS Overlay Experiment Using Geostationary Satellite, ETS-VIII
Shinichi Nakamura,Takahiro Inoue,Ryo Nakamura,Seiji Katagiri,Suthichai Noppanakeepong,Yanming Feng 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
For Global Navigation Satellite System (GNSS) technology, the accuracy of navigation signals (time reference signal) is very important. To improve the accuracy of the navigation signals, exact time control of thesatellite and highly accurate clock synchronization between satellites and ground stations are required. JAXA plans to conduct a time synchronization experiment for future global navigation satellite technology. The objective of the experiment is to confirm whether a geostationary satellite is useful for the positioning accuracy improvement if it isused as a GNSS. This clock management technology will be utilized in the quasi-zenith satellite system, which has been studied in Japan. In this symposium, the results of a experiment and the experiment outline will be reported.