Terahertz Time-Domain Spectroscopy of Amino Acids and Polypeptides

Frequency-dependent absorption coefficients and refractive indices of amino acids (glycine and l-alanine) and polypeptides (polyglycine and poly-l-alanine) in the wavenumber region from 7 to 55 cm(−1) were measured by terahertz time-domain spectroscopy. A vibrational band was observed at 45.5 cm(−1) for polyglycine, which was assigned as an interchain mode. The reduced absorption cross sections of the amino acids and polypeptides show power-law behavior. The exponents are different between the monomers and polymers, and those of the two polypeptides suggest that the time dependences of the total dipole moments are similar in the timescale of subpico- to picoseconds

温暖化時の台風が建物やまちに与える影響に関する研究

Replicated experiments and numerical experiments under future climate were conducted for Typhoon Hagibis. The results showed that under the future climate, the typhoon is more powerful than under the present climate, and the peak wind loads on building surfaces are about 1.5 to 2 times more likely. In addition, a large-scale ensemble experimental data set was used to investigate wind speeds and typhoon characteristics for reproduction periods of 50 years and 500 years. The results showed that wind speed increases and typhoon pressure drop increases with global warming