1.

図書

図書
ed. by B. C. Kuo
出版情報: Illinois : Incremental Motion Control Systems Society, 1987
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2.

論文(リポジトリ)

論文(リポジトリ)
Deng, Yange ; Fujinari, Hiroaki ; Yai, Hikari ; Shimada, Kojiro ; Miyazaki, Yuzo ; Tachibana, Eri ; Deshmukh, K. Dhananjay ; Kawamura, Kimitaka ; Nakayama, Tomoki ; Tatsuta, Shiori ; Cai, Mingfu ; Xu, Hanbing ; Li, Fei ; Tan, Haobo ; Ohata, Sho ; Kondo, Yutaka ; Takami, Akinori ; Hatakeyama, Shiro ; Mochida, Michihiro
出版情報: Atmospheric Chemistry and Physics.  22  pp.5515-5533,  2022-05-02.  European Geosciences Union — Copernicus Publications
URL: http://hdl.handle.net/20.500.12000/0002017926
概要: Filter-based offline analysis of atmospheric aerosol hygroscopicity coupled to composition analysis provides information complementary to that obtained from online analysis. However, its application itself and comparison to online analysis have remained limited to date. In this study, daily submicrometer aerosol particles (PM0.95, 50 % cutoff diameter 0.95 µm) were collected onto quartz fiber filters on Okinawa Island, a receptor of East Asian outflow, in the autumn of 2015. The chemical composition of water-soluble matter (WSM) in PM0.95, PM0.95 itself, and their respective hygroscopicities were characterized through the offline use of an aerosol mass spectrometer and a hygroscopicity tandem differential mobility analyzer. Thereafter, results were compared with those obtained from online analyses. Sulfate dominated the WSM mass (59 %), followed by water-soluble organic matter (WSOM, 20 %) and ammonium (13 %). WSOM accounted for most (91 %) of the mass of extracted organic matter (EOM) and the atomic O-to-C ratios (O : C) of WSOM and EOM were high (mean ± standard deviation were 0.84 ± 0.08 and 0.78 ± 0.08, respectively), both of which indicate highly aged characteristics of the observed aerosol. The hygroscopic growth curves showed clear hysteresis for most samples. At 85 % relative humidity (RH), the calculated hygroscopicity parameter κ values of the WSM (κWSM), WSOM, EOM, andPM0.95 (κPM0.95 ) were 0.50 ± 0.03, 0.22 ± 0.12, 0.20 ± 0.11, and 0.47 ± 0.03, respectively. An analysis using the thermodynamic Extended Aerosol Inorganics Model (E-AIM) shows, on average, that inorganic salts and WSOM contributed 88 % and 12 %, respectively, of the κWSM (or κPM0.95 ). High similarities were found between offline and online analysis for chemical compositions that are related to particle hygroscopicity (the mass fractions and O : C of organics and the degree of neutralization) and also for aerosol hygroscopicity. As possible factors governing the variation in κWSM, the influences of WSOM abundance and the neutralization of inorganic salts were assessed. At high RH (70 %–90 %), the hygroscopicity of WSM and PM0.95 was affected considerably by the presence of organic components; at low RH (20 %–50 %), the degree of neutralization could be important.This study not only characterized aerosol hygroscopicity at the receptor site of East Asian outflow but also shows that offline hygroscopicity analysis is an appropriate method, at least for aerosols of the studied type. The results encourage further applications to other environments and to more in-depth hygroscopicity analysis, in particular for organic fractions. 続きを見る
3.

論文(リポジトリ)

論文(リポジトリ)
水山, 克 ; Mizuyama, Masaru ; 久保, 弘文 ; Kubo, Hirofumi ; 藤田, 喜久 ; Fujita, Yoshihisa
出版情報: Fauna Ryukyuana — Fauna Ryukyuana.  64  pp.65-73,  2022-04-07.  琉球大学資料館 (風樹館)
概要: 琉球列島の海底洞窟 (沖縄諸島の沖縄島および伊江島, 宮古諸島の下地島) からハチノスキクザルChama cerion Matsukuma, Paulay & Hamada, 2003 の生貝を記録した. これらの標本は, 本種のホロタイプ 標本と同様に, 右殻表面に折れ曲がって重なり合う特徴的な鱗片状突起が確認され, また, この突起構造は左殻にも見られることが明らかとなった. 一方, 少なくとも本種のパラタイプ標本の一部には鱗片状突起が見らない個体が含まれており, C. cerion のパラタイプ標本にはホロタイプ標本とは異なる種 (おそらく未記載種) が含まれている可能性が示唆された. 本種の生貝記録は, トンガ王国ニウエ島で採集された一例のみとされてきたが, このパラタイプ標本はC. cerion ではない可能性があることから, 本報告が本種の確実な生貝の初記録となる. また, 本種が海底洞窟内のアンキアライン環境 (暗黒下かつ低塩分環境) に生息することも明らかとなった.
The rare chamid bivalve, Chama cerion Matsukuma, Paulay & Hamada, 2003, is recorded from submarine caves in Okinawa-jima Island and Ie-jima Island of the Okinawa Island Group, and Shimoji-jima Island of the Miyako Island Group, Ryukyu Islands, southwestern Japan. The specimens examined possessed bent over, overlapping scales that characterize the outer surface of right valve of the holotype of C. cerion, and these characteristic scales were also found in the left valve. On the other hand, these characteristic scales were not found in a paratype examined in this study. This indicates that at least one paratype is not conspecific to the holotype and they seem to consist of more than two species, including a potentially undescribed species. All the specimens of C. cerion from the Ryukyu Islands have been found in anchialine environments of submarine caves (darkness and low salinity conditions), and these records represent the first definite findings of living individuals of C. cerion.
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4.

論文(リポジトリ)

論文(リポジトリ)
Shimada, Kojiro ; Nohchi, Masayuki ; Maeshima, Koji ; Uchino, Tomonori ; Kobayashi, Yusuke ; Ono, Kazuki ; Ogata, Hiroko ; Katsumi, Naoya ; Inazu, Koji ; Okochi, Hiroshi
出版情報: Scientific Reports.  12  2022-03-11.  Springer Nature
URL: http://hdl.handle.net/20.500.12000/0002017922
概要: The concentrations of polycyclic aromatic hydrocarbons (PAHs) in aerosol were measured in Shinjuku, which is central Tok yo, Japan, for 10 years from 2007 to 2016. The efects of changes in emission sources and their degradation by reaction with ozone were assessed in this study. There was no signifcant increasing or decreasing trend of the PAH concentrations during 10 years (P> 0.05). The average selected seven the PAH concentrations (0.88 ng ­m−3) during 10 years was lower than those in New York and Paris. However, the trend of ozone concentrations is increasing in central Tokyo. This inconsistency raises a question. Did the fact that the ozone concentration was higher than the PAH concentrations promote PAH degradation? To apportion the PAH sources, we used PAH concentration profles and positive matrix factorization analysis. The contribution of vehicle emissions to the PAHs ranged from 40 to 80%. Ozone concentrations increased by 3.70%/year during 10 years. The theoretical degradation rates of PAHs by ozone, which were calculated using a pseudo-frst-order rate equation, suggested that the lifetimes of benzo[a]pyrene (BaP) decreased by 1 min from 2007 to 2016. We investigated the aging of BaP using the profle of the isomer ratios. We found that the aging of BaP at the urban and roadside sites were nearly identical indicating aging regardless of the season. Although the decomposition of BaP is promoted by the photochemical oxidation reaction, this result suggests that a certain threshold value exists as the degree of the decomposition. This degradation of PAH can improve chemical loss processes in air quality model. 続きを見る
5.

図書

図書
[edited by] Courtney M. Townsend, Jr. ... [et al.]
出版情報: St. Louis, Mo. : Elsevier, c2022
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6.

図書

図書
Gerald G. Briggs, Craig V. Towers, Alicia B. Forinash
出版情報: Philadelphia : Wolters Kluwer, c2022
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7.

図書

図書
Katherine Stuart van Wormer, Clemens Bartollas
出版情報: New York, NY : Routledge, 2022
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8.

図書

図書
edited by Nicholas McGuinn ... [et al.]
出版情報: London : Routledge, 2022
シリーズ名: Routledge research in education
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9.

図書

図書
[edited by] Roberta L. Hines, Stephanie B. Jones
出版情報: Philadelphia, PA : Elsevier, c2022
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10.

図書

図書
Paul F. Rothstein, David Crump, Ronald J. Coleman
出版情報: Saint Paul : West Academic Publishing, c2022
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