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Sako, Hiroyuki; Harada, Hiroyuki; Sakaguchi, Takao*; Chujo, Tatsuya*; Esumi, Shinichi*; Gunji, Taku*; Hasegawa, Shoichi; Hwang, S.; Ichikawa, Yudai; Imai, Kenichi; et al.
Nuclear Physics A, 956, p.850 - 853, 2016/12
Times Cited Count:13 Percentile:65.38(Physics, Nuclear)Watanabe, Takahiro; Nara, Fumiko*; Matsunaka, Tetsuya*; Minoura, Koji*; Kakegawa, Takeshi*; Yamasaki, Shinichi*; Tsuchiya, Noriyoshi*; Nakamura, Toshio*; Junbo, W.*; Liping, Z.*
no journal, ,
Understanding of past environmental and geochemical changes is significant issues to estimate global climate variation. Therefore, these changes have been studied by continuous terrestrial sediments. The high-time resolution past environmental changes, especially monsoon fluctuations, have been reported in previous studies using geochemical signatures in stalagmites from Asian caves. However, continuous climate records in Tibetan plateau have not yet been cleared, which a key area to understand mechanism of monsoon fluctuations. In this study, mean grain size and geochemical proxies from lake sediment cores from south Tibetan plateau were used for estimation of past monsoon changes during Holocene. Spectral analysis of the mean grain size in the Tibetan lake indicated 1000-1500 years climate cycles, which might be caused by the changes in solar activities. These monsoon fluctuations based on the mean grain size were also supported by geochemical proxies in this study.
Iino, Chiaki*; Okumoto, Shunsuke*; Oda, Masato*; Nara, Jun*; Muraguchi, Masakazu*; Ishii, Hiroyuki*; Honda, Mitsunori
no journal, ,
Weathered Biotite (WB) with Cs adsorbed on it is removed of less than 99.9999% of Cs by the molten salt method, and crystalline minerals such as Augite and Wadalite are synthesized. In order to elucidate the reaction mechanism of the synthesis of Wadalite, a comparative study of chemical potentials was conducted to investigate the stable structures and electronic properties of WB and Wadalite before and after the reaction, using first-principles calculations.