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ASTROD I, Test of Relativity, Solar-System Measurement and G-Wave Detection
Wei-Tou Ni,Albrecht Rudiger,Etienne Samain,Stephan Schiller,Diana Shaul,Sachie Shiomi,Timothy Sumner,Chien-Jen Tang,Jinhe Tao,Pierre Touboul,Haitao Wang,Andreas Wicht,Ji Wu,Xue-Jun Wu,Yaoheng Xiong,Ch 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
ASTROD-I is a mission concept under study to realize the general concept of ASTROD (Astrodynamical Space Test of Relativity using Optical Devices). This mission concept has one spacecraft carrying a payload of a telescope, ve lasers, and a clock together with ground stations (ODSN: Optical Deep Space Network) to test the optical scheme of interferometric and pulse ranging and yet give important scientic results. The scientic goals include a better measurement of the relativistic parameters, a better sensitivity in using optical Doppler tracking method for detecting gravitational waves, and measurement of many solar system parameters more precisely. The weight of this spacecraft is estimated to be about 300-350 kg with a payload of about 100-120 kg. The spacecraft is to be launched with initial period about 290 days and to pass by Venus twice to receive gravity-assistance for achieving shorter periods. With good orbit design, after about 370 days from launch, the spacecraft will arrive at the other side of the Sun for the determination of relativistic parameters.
Photophysical characterization of oligopyrene modules for DNA-based nanosystems
Galievsky, Victor A.,Malinovskii, Vladimir L.,Stasheuski, Alexander S.,Samain, Florent,Zachariasse, Klaas A.,Haner, Robert,Chirvony, Vladimir S. Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.10
The photophysics of free pyrenedicarboxamide (Py-DCA) in solution as well as of single-stranded and double-stranded oligonucleotides (ss and ds ONs) containing 1-7 pyrene building blocks per strand were studied by steady-state and time-resolved fluorescence spectroscopy. It was found that the fluorescence quantum yield ${\Phi}F$ of free Py-DCA chromophore in solution is rather high (${\Phi}F$ = 0.44). However, after incorporation of the chromophore into a ss ON the monomeric chromophore fluorescence is quenched more than 40-fold due to electron-transfer reactions with ON bases. An increase of the number n of neighboring pyrenes in an ON results in ${\Phi}F$ growth up to 0.25 at n = 6. Starting from n = 2, all fluorescence belongs mainly to excimer formed by pyrene chromophores. Sections composed of multiple pyrenes may be considered as robust functional entities that may serve as independent modules in DNA-based, functional nano-architectures.