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238 results on '"Mori, Yasushige"'

10. Physically unclonable functions taggant for universal steganographic prints

Author

20756803, 00346040, Fukuoka, Takao, Mori, Yasushige, Yasunaga, Toshiya, Namura, Kyoko, Suzuki, Motofumi, Yamaguchi, Akinobu, 20756803, 00346040, Fukuoka, Takao, Mori, Yasushige, Yasunaga, Toshiya, Namura, Kyoko, Suzuki, Motofumi, and Yamaguchi, Akinobu

Abstract

Counterfeiting of financial cards and marketable securities is a major social problem globally. Electronic identification and image recognition are common anti-counterfeiting techniques, yet they can be overcome by understanding the corresponding algorithms and analysis methods. The present work describes a physically unclonable functions taggant, in an aqueous-soluble ink, based on surface-enhanced Raman scattering of discrete self-assemblies of Au nanoparticles. Using this stealth nanobeacon, we detected a fingerprint-type Raman spectroscopy signal that we clearly identified even on a business card with a pigment mask such as copper-phthalocyanine printed on it. Accordingly, we have overcome the reverse engineering problem that is otherwise inherent to analogous anti-counterfeiting techniques. One can readily tailor the ink to various information needs and application requirements. Our stealth nanobeacon printing will be particularly useful for steganography and provide a sensitive fingerprint for anti-counterfeiting.

Published
2022

15. Determination of the metabolites of the new designer drugs bk-MBDB and bk-MDEA in human urine

Author

Zaitsu, Kei, Katagi, Munehiro, Kamata, Hiroe T., Kamata, Tooru, Shima, Noriaki, Miki, Akihiro, Tsuchihashi, Hitoshi, and Mori, Yasushige

Subjects
Designer drugs -- Research, Metabolism -- Research, Metabolites -- Research, Law
Abstract

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.forsciint.2009.04.001 Byline: Kei Zaitsu (a), Munehiro Katagi (a), Hiroe T. Kamata (a), Tooru Kamata (a), Noriaki Shima (a), Akihiro Miki (a), Hitoshi Tsuchihashi (a), Yasushige Mori (b) Keywords: Designer drug; bk-MBDB; bk-MDEA; Metabolism Abstract: This is the first report on identifying the specific metabolites of the new designer drugs 2-methylamino-1-(3,4-methylenedioxyphenyl)butan-1-one (bk-MBDB) and 2-ethylamino-1-(3,4-methylenedioxyphenyl)propan-1-one (bk-MDEA) in human urine using synthesized standards. Based on GC/MS and LC/MS, we identified N-dealkylation, demethylenation followed by O-methylation, and [beta]-ketone reduction as their major metabolic pathways. The quantitative analyses by LC/MS revealed that both demethylenation followed by O-methylation and [beta]-ketone reduction were superior to N-dealkylation and that both bk-MBDB and bk-MDEA were mainly metabolized into their corresponding 4-hydroxy-3-methoxy metabolites (4-OH-3MeO metabolites). After hydrolysis, the concentrations of 4-OH-3MeO metabolites and 3-hydroxy-4-methoxy metabolites of both bk-MBDB and bk-MDEA dramatically increased, suggesting that the metabolites mainly exist as their conjugates. Author Affiliation: (a) Forensic Science Laboratory, Osaka Prefectural Police Headquarters, 1-3-18, Hommachi, Chuo-ku, Osaka 541-0053, Japan (b) Department of Chemical Engineering and Materials Science, Doshisha University, 1-3, Tatara Miyakodani, Kyotanabe-shi, Kyoto 610-0321, Japan Article History: Received 23 October 2008; Revised 30 March 2009; Accepted 1 April 2009

Published
2009

46. Self-assembled nanoscale architecture of TiO2 and application for dye-sensitized solar cells

Author

Adachi, Motonari, Jiu, Jinting, Isoda, Seiji, Mori, Yasushige, and Uchida, Fumio

Subjects
Case Report
Abstract

A single-crystal-like titania nanowire network was successfully synthesized by a surfactant assisted “oriented attachment” mechanism. Highly crystallized titania nanorods have been synthesized by hydrothermal process using block-copolymer F127 with ethylenediamine. It was observed from high resolution TEM image that titanium atoms aligned perfectly in titania anatase structure with no defect. A high light-to-electricity conversion yield (9.3%) was attained by applying these titania nanoscale materials for making an electrode of dye-sensitized solar cells.

Published
2008

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