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Murakami, Ryu*; Mitsui, Seiichiro; Hirabayashi, Akira*; Ueda, Norio*
Nihon Bunkazai Kagakkai Dai-26-Kai Taikai Kenkyu Happyo Yoshishu, p.108 - 109, 2009/07
Bronze halberds and bells in the Yayoi Period have been excavated from Yanagisawa archaeological site in Nakano City, Nagano Prefecture. This is the first case which both the artifacts were coincidentally excavated in eastern Japan and is important archaeological discovery. To identify the reason of good preservation of the artifacts, we analyzed soil and groundwater at the site as burial conditions. We also investigated migration behavior of copper, lead and tin as metal components derived from the artifacts in the surrounding soil. The results indicate that the preservation of the artifacts depends on the burial environment. In addition, we found that copper and lead migrated to the position of two meters from the pit buried the artifacts.
Lee, S.; Morgos, A.*; Matsui, Toshiya*; Yoshikawa, Hideki
no journal, ,
Examine for the relationship between microbial activity and a corrosion product of iron artifacts were performed to obtain some information for diagnostic artifacts and the degradation of metallic material. The iron phosphate that is important for anti-corrosion coatin the iron metal is observed in the reaction of iron-reducing bacteria on carbon steel corrosion.
Yoshikawa, Hideki; Tokuda, Masashi*; Seiki, Yuji*
no journal, ,
no abstracts in English