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147 results on '"Mori, Ikuko"'

18. Polarized NEXAFS spectroscopic studies of poly(butylene terephthalate), poly(ethylene terephthalate), and their model compounds

Author

Okajima, Toshihiro, Teramoto, Kazuyoshi, Mitsumoto, Ryuichi, Oji, Hiroshi, Yamamoto, Yasushi, Mori, Ikuko, Ishii, Hisao, Ouchi, Yukio, and Seki, Kazuhiko

Subjects
Polybutylene terephthalate -- Research, Polyethylene terephthalate -- Research, X-ray spectroscopy -- Usage, Absorption spectra -- Analysis, Polarization (Light) -- Analysis, Chemicals, plastics and rubber industries
Abstract

Poly(butylene terephthalate)(PBT) and poly(ethylene terephthalate) (PET) and their model compounds 4,4'-biphenyldecarboxylic acid dimethyl ester (PAM), 4,4'-biphenyldicarboxylic acid (PCA), and terephthalic acid (TPA) were studied using polarized near edge X-ray absorption fine structure (NEXAFS) spectroscopy. Results indicate that the observed spectral features of PBT and PET could be assigned in detail by the polarization dependence and the comparison among the compounds. Some features were reassigned on the basis of the experimental observations.

Published
1998

25. Spatial contrast of Asian dust concentration between windward and leeward of mountains in Japan during 1-2 April 2007

Author

HAYASAKI, Masamitsu, YAMAMOTO, Munehisa K., HIGUCHI, Atsushi, SHIMIZU, Atsushi, MORI, Ikuko, and NISHIKAWA, Masataka

Abstract

[ABSTRACT]During massive Asian dust episode for 1-2 April 2007, mass concentration of suspended particulate matter (SPM) rapidly began to increase in the morning on 1 April from coastal side of the Japan Sea. For the daytime 1 April, while rapid SPM increase and extreme high concentrations observed in Hokuriku and Tohoku, SPM concentrations in Kanto remained low level and increased from late afternoon. Ground lidar observation and rawinsonde sounding in Hokuriku show that the top height of dust layer (~ 2 km) approximately correspond to the base of temperature inversion. In Kanto, SPM increase began from east coast and then it advanced westward after 15 LT with easterly wind. The CloudSat/CPR and CALIPSO/CALIOP observations show that clouds over mainland Japan and the Japan Sea was found in the upper-level (> 6 km). Continuous meteorological observations show that cloud condensation and rainfall was not observed over mountains for the daytime 1 April. These results suggest that the temporal delaying of SPM increase in Kanto was caused by an indirect dust transport.

Published
2010

27. AMS <14>^C ages and possibility of paleoenvironmental studies by <13>^C/<12>^C measurements of collagen and <18>^O/<16>^O of phosphate in fossil mammal bones and teeth

Author

Nakai, Nobuyuki, Yosida, Naohiro, Mori, Ikuko, Nakamura, T., and Kaneda, H.

Abstract

The purpose of present paper is to report the results of age determination and paleoclimatic studies deduced from isotope measurements of mammal fossil bones and teeth. Radio- and stable-carbon isotopes (^C and ^C) of collagens extracted from bones have been determined for seven fossil deers excavated from the Holocene shellmounds of the Kantoh plains. The stable oxygen isotope ratio (^O/^O) analyses also have been done for phosphate of eight teeth and six jaw bones from seven sites in Aichi Prefecture, Central Japan. A new sensitive technique of radiocarbon measurment, Accelerator Mass Spectrometry provides the ^C-date by using only 5 to 10mg of collagen or 2 to 5mg as C. The Tandetron Accelerator Mass Spectrometer at Dating and Materials Research Center, Nagoya University has been used for the present studies. Stable isotopes, δ^C and δ^O were analysed with the Dual Collector Mass Spectrometer at Department of Earth Sciences, Nagoya University and with the Triple Collector Mass Spectrometer at Department of Earth Sciences, Toyama University, respectively. After verifying the good preservation of collagens by the contents of fossil bone samples and the C/N ratios, ^C and ^C were determined for the age dating and the relative paleotemperature estimation, respectively. On the other hand ^O of calcium phosphate constituting bone and tooth samples was analysed for the paleohumidity estimation. Results obtained from the above-mentioned isotopic studies are as follows. (a) AMS ^C ages of mammal fossil sika deer (Cervus nippon) bones from the Kantoh plains range from 5,090 to 2,820yr.BP. Although the ^C age of teeth and jaw bones from Aichi Prefecture did not determined yet, their ages could be estimated to be from "Early Jomon period" to "Middle Yayoi period" by the detailed archeological studies, corresponding to 6,000 to 2,000yr.BP in the ^C age scale. (b) δ^C results of bone-collagens showed that before 4,000yr.BP the temperature was high, corresponding to "the Maximum Phase of Jomon Marine Transgression", and then a sudden dropping trend of temperature occurred from 4,000yr.BP to 3,000yr.BP, reaching the low temperature period like "Little Ice Age" around 3,000yr.BP. This temperature decrease agrees well with that deduced from organic δ^C-studies of colamnar sediments taken from the Pacific coast of Japanese Island. (c) Paleohumidity fluctuation deduced from δ^O measurements of tooth- and jaw bone-phosphate samples shows clearly a positive oorrelation with the paleotemperature fluctuation, that is, the high temperature period is fit for the high humidity and wet period, and the low temperature period for the low humidity and dry period without exception. (d) It can be finally concluded that it was high temperature even higher than the present and relatively wet climate during the Early Jomon through the early phase of Middle Jomon period and low temperature like a Little Ice Age and relatively dry climate in the Latest Jomon period., 名古屋大学タンデトロン加速器質量分析計シンポジウム報告 [タンデトロン加速器質量分析計を用いた14C年代測定の利用による地質学･地理学的研究の新展開] Proceedings of Symposium on Tandetron Accelerator Mass Spectrometer, Nagoya University\ “New Developments in Geological and Geographical Studies by Using 14C dates with the Tandetron Accelerator Mass Spectrometer”

Published
1993

43. Airborne Asian sand dust enhances murine lung eosinophilia

Author

He, Miao, primary, Ichinose, Takamichi, additional, Yoshida, Seiichi, additional, Nishikawa, Masataka, additional, Mori, Ikuko, additional, Yanagisawa, Rie, additional, Takano, Hirohisa, additional, Inoue, Ken-ichiro, additional, Sun, Guifan, additional, and Shibamoto, Takayuki, additional

Published
2010
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