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3 results on '"Shi-jie Chen"'

2. Terahertz optical constants of ytterbium-doped yttrium aluminum garnet crystals

Author

Tsong-Ru Tsai, Chih-Fu Chang, Shi-Jie Chen, Tani, Masahiko, Yamaguchi, Mariko, Sumikura, Hisashi, Hai-Pang Chiang, Yuan-Fan Chen, and Wan-Sun Tse

Subjects
Ytterbium -- Structure, Ytterbium -- Optical properties, Aluminum -- Optical properties, Aluminum -- Structure, Photons -- Research, Time-domain analysis, Physics
Abstract

Terahertz time-domain spectroscopy is used to measure the optical constants of ytterbium-doped yttrium aluminum garnet [([Yb.sub.x][Y.sub.1-x]). sub.3][Al.sub.5][O.sub.12] (Yb:YAG) crystals for nominal x values of 0.0, 0.1, 0.2, 0.5, 0.8 and 1.0 in the frequency range from 0.2 to 1.8 THz. The results show that the phonon modes of the Yb:YAG crystals shift to lower frequencies with substitution of Yb for Y and the extinction coefficients of the Yb:YAG crystals are smaller than 0.05.

Published
2006

3. RNA folding transitions and cooperativity

Author

Tostesen, Eivind, Shi-Jie Chen, and Dill, Ken A.

Subjects
Thermodynamics -- Research, RNA -- Research, RNA -- Thermal properties, RNA -- Mechanical properties, Chemistry, Physical and theoretical -- Research, Chemicals, plastics and rubber industries
Abstract

The conformational energy landscapes and the statistical thermodynamics of ribo-nucleic acid (RNA) secondary structure folding is explored by employing a new theoretical model, which is physical, treats the conformational entropies and excludes volume explicitly. The results suggest that the RNA folding can be complex and sequence-dependent and large changes in the shapes of the landscapes could be caused due to small changes.

Published
2001

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