Updated on 2022/12/24

写真a

 
YAMAKAWA Junji
 
Organization
Faculty of Natural Science and Technology Assistant Professor
Position
Assistant Professor
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Degree

  • Doctor (Science) ( Okayama University )

Research Interests

  • 地理情報システム

  • 鉱物学

  • Geostatistics

  • GIS

  • Mineral science

  • 地球統計学

Research Areas

  • Natural Science / Solid earth sciences

  • Humanities & Social Sciences / Geography

  • Environmental Science/Agriculture Science / Environmental dynamic analysis

Education

  • Okayama University   自然科学研究科   物質基礎科学

    1991.4 - 1994

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    Country: Japan

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  • Okayama University   理学研究科   地球科学

    1989.4 - 1991.3

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  • Okayama University   理学部   地球科学科

    1985.4 - 1989.3

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    Country: Japan

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Research History

  • Faculty of Natural Science and Technology, Okayama University   Assistant Professor

    2021.4

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  • Graduate School of Natural Science and Technology, Okayama University   Assistant Professor

    2007.4 - 2021.3

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  • Graduate School of Natural Science and Technology, Okayama University   Research Assistant

    2005.4 - 2007.3

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  • Okayama University

    1994.4 - 2005.3

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Professional Memberships

  • Japan society of Geoinformatics

    2018.10

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  • International Association for Mathematical Geology

    2018.4

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  • Japan Associasion of Mineralogical Sciences

    1994.4

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Papers

  • Long-term exposure to fine particulate matter and natural-cause and cause-specific mortality in Japan

    Takashi Yorifuji, Saori Kashima, Yasunari Tani, Junji Yamakawa, Hiroyuki Doi

    Environmental Epidemiology   3 ( 3 )   e051 - e051   2019.5

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    Publishing type:Research paper (scientific journal)   Publisher:Ovid Technologies (Wolters Kluwer Health)  

    DOI: 10.1097/ee9.0000000000000051

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  • Non-Destructive Evaluation Method of Pharmaceutical Tablet by Terahertz-Time-Domain Spectroscopy: Application to Sound-Alike Medicines

    Masaya Kawase, Kohji Yamamoto, Keita Takagi, Ryohei Yasuda, Masafumi Ogawa, Yasutoshi Hatsuda, Sonoyo Kawanishi, Yoshihiko Hirotani, Michiaki Myotoku, Yoko Urashima, Katsuhito Nagai, Kenji Ikeda, Hiroki Konishi, Junji Yamakawa, Masahiko Tani

    Journal of Infrared, Millimeter, and Terahertz Waves   34 ( 9 )   566 - 571   2013.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    To evaluate terahertz time-domain spectroscopy (THz-TDS) as a promising tool for discriminating pharmaceutical tablets, THz-TDS has been applied for discrimination between pharmaceutical tablets with sound-alike names. Two sets of medicine tablets with sound-alike names, that is, Amaryl and Almarl, Zyloric and Zantac, are examined in this study. Based on the difference in THz absorption spectra, we have succeeded in distinguishing between sound-alike medicine tablets clearly for each set. The results in this study suggest that THz-TDS is a useful tool that is indispensable for medical security maintenance, such as a non-destructive way to prevent mix-up of medicine. © 2013 Springer Science+Business Media New York.

    DOI: 10.1007/s10762-013-9994-2

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    Other Link: http://link.springer.com/article/10.1007/s10762-013-9994-2/fulltext.html

  • Application of Terahertz Absorption Spectroscopy to Evaluation of Aging Variation of Medicine

    Masaya Kawase, Tadashi Saito, Masafumi Ogawa, Hideki Uejima, Yasutoshi Hatsuda, Sonoyo Kawanishi, Yoshihiko Hirotani, Michiaki Myotoku, Kenji Ikeda, Hiroki Konishi, Ikumi Iga, Junji Yamakawa, Seizi Nishizawa, Kohji Yamamoto, Masahiko Tani

    ANALYTICAL SCIENCES   27 ( 2 )   209 - 212   2011.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN SOC ANALYTICAL CHEMISTRY  

    The absorption spectra of three kinds of medicines both before and after the expiration date: Amlodin OD (R) (5 mg), Basen OD (R) (0.2 mg) and Gaster D (R) (10 mg) have been measured by terahertz time domain spectroscopy (THz-TDS). All the medicines show some differences in the THz absorption spectra between medicines before and after the expiration dates. X-Ray powder diffraction (XRD) studies of all medicines suggest that the polymorph of the main effective compound is not changed before and after the expiration date. Therefore, the differences in the THz spectra between medicines before and after the expiration dates arise from aging variation of diluting agents and/or from modifications of intermolecular interaction between the effective compounds and diluting agents.

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  • Moessbauer Spectroscopy of Epidote from Osayama, Okayama Prefecture

    KAWASE Masaya, YAMAKAWA Jyunji, OSHIMA Miyoko, KUROKUZU Masayuki, MORIMOTO Shotaro, SAITO Tadashi

    Radioisotope   60 ( 11 )   461 - 465   2011

  • Mineral chemistry of schulenbergite and its Zn-dominant analogue from the Hirao mine, Osaka, Japan

    Masayuki Ohnishi, Isao Kusachi, Shoichi Kobayashi, Junji Yamakawa

    JOURNAL OF MINERALOGICAL AND PETROLOGICAL SCIENCES   102 ( 4 )   233 - 239   2007.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN ASSOC MINERALOGICAL SCIENCES  

    Schulenbergite and its Zn-dominant analogue occur in the Hirao mine, Osaka Prefecture, Japan. The minerals were found as crusts on the same gallery wall and in cracks of altered shale. The minerals occur as aggregates of hexagonal platy crystals up to 0.5 mm across and 0.05 mm thick. The schulenbergite is greenish blue to blue-green in color, and the Cu/(Cu + Zn) molar ratio varies from 0.67 to 0.42. The Zn-dominant analogue of schulenbergite is pale blue in color, and the Cu/(Cu + Zn) molar ratio varies from 0.30 to 0.21. The average unit cell parameters of schulenbergite and its Zn-dominant analogue calculated from the X-ray powder diffraction data were: a = 8.256 (2) and c = 7.207 (3) angstrom, and a = 8.292 (2) and c = 7.271 (4) angstrom, respectively. It is likely that schulenbergite and its Zn-dominant analogue from the Hirao mine were formed as secondary minerals from Cu and Zn ion-bearing solution that were derived from chalcopyrite and sphalerite in the host rock.

    DOI: 10.2465/jmps.061130

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  • Numanoite, Ca4CuB4O6(OH)(6)(CO3)(2), a new mineral species, the Cu analogue of borcarite from the Fuka mine, Okayama Prefecture, Japan

    Masayuki Ohnishi, Isao Kusachi, Shoichi Kobayashi, Junji Yamakawa, Mitsuo Tanabe, Shigetomo Kishi, Takashi Yasuda

    CANADIAN MINERALOGIST   45 ( 2 )   307 - 315   2007.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:MINERALOGICAL ASSOC CANADA  

    Numanoite, the Cu analogue of borcarite, is found in an irregular patch in crystalline limestone near gehlenite-spurrite skarns at the Fuka mine, Okayama Prefecture, Japan. Numanoite (up to I mm across) is observed as a core or zones in borcarite crystals up to 5 mm long. The mineral is also found as veinlets up to 0.4 mm wide in aggregates of borcarite crystals. The associated minerals are nifontovite, bultfonteinite, calcite and an unidentified magnesium silicate mineral. In hand specimen, the mineral is blue-green to colorless and transparent with a vitreous luster. The streak is white to pale blue-green. Numanoite is monoclinic, space group C2/m, a 17.794(2), b 8.38 1 (1), c 4.4494(7) angstrom, beta 102.42(2)degrees and Z = 2. The strongest seven lines in the X-ray powder diffraction pattern [d in angstrom(I)(hkl)] are 7.57(100)(110), 2.671(84)(421), 2.727(68)(221), 1.887(52)(041,440), 2.272(48)(331), 2.899(44)(600) and 1.698(34)(640). Electron-microprobe and thermogravimetric analyses gave B2O3 24.09, CaO 38.11, CuO 10.32, MgO 1.02, ZnO 0.51, CO2 15.80, H2O 9.75, sum 99.60 wt.%. The empirical formula, calculated on the basis of 0 = 18, is Ca-3.898(Cu0.744Mg0.145Zn0.036)Sigma 0.925B3.969O5.615(OH)(6.208)(CO3)(2.059), ideally Ca4CuB4O6(OH)(6)(CO3)(2). The mineral is optically biaxial negative, alpha 1.618(2), beta 1.658(2), gamma 1.672(2), and 2V(calc) = 60 degrees. The mineral has perfect cleavages in two directions. The density is 2.96(2) g/cm(3) (meas.) and 2.93 g/cm(3) (calc.). The Vickers microhardness is 376 (290-464) kg/mm(2) (25 g load), and the Mohs hardness number is 41/2. The differential thermal analysis curve shows two endothermic peaks at 489 degrees and 692 degrees C. It is likely that numanoite from the Fuka mine formed by precipitation from late Cu- and Mg-bearing hydrothermal solutions.

    DOI: 10.2113/gscanmin.45.2.307

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  • Cu-analogue of borcarite from the Fuka mine, Takahashi, Okayama Prefecture, Japan

    Ohnishi Masayuki, Kusachi Isao, Kobayashi Shoichi, Yamakawa Junji, Tanabe Mitsuo, Kishi Shigetomo, Yasuda Takashi

    Abstracts for Annual Meeting of the Mineralogical Society of Japan   2005   118 - 118   2005

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    Publisher:Japan Association of Mineralogical Sciences  

    DOI: 10.14824/kobutsu.2005.0.118.0

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  • Inyoite from Fuka, Okayama Prefecture, Japan

    Kusachi, I, S Kobayashi, M Tanabe, S Kishi, J Yamakawa

    JOURNAL OF MINERALOGICAL AND PETROLOGICAL SCIENCES   99 ( 2 )   67 - 71   2004.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN ASSOC MINERALOGICAL SCIENCES  

    Inyoite was found as fissure fillings in calcium borate minerals, which occur as an irregularly shaped body in the crystalline limestone near the gehlenite-spurrite skarns at the Fuka mine, Okayama Prefecture, Japan. Inyoite occurs as aggregates of tabular crystals up to 1 mm wide, and rarely as euhedral crystals up to 0.5 mm wide in fissures of calcium borate minerals such as nifontovite, pentahydroborite, sibirskite and parasibirskite. The fissure fillings are composed only of inyoite. This is the first finding of inyoite in Japan. The type of occurrence is also different from those in many other localities in the world. Electron microprobe and CHNS / O analyses gave the empirical formula Ca1.99B5.96O5.92(OH)(10).8.08H(2)O on the basis of O = 24. The unit cell parameters are a = 10.616(2), b = 12.068(1), c = 8.404(1) angstrom and beta = 114.01(1)degrees. The mineral is optically biaxial negative with refractive indices alpha = 1.492, beta = 1.506 and gamma = 1.517, giving a calculated 2V = 82 degrees. The Vickers microhardness is 91 kg mm(-2) (10 g load) and the Mohs hardness number is 2.5. The measured density is 1.875 g cm(-3). It is likely that the inyoite at the Fuka mine was formed by a reaction of ground water with calcium borate minerals at a temperature of around 20 degrees C.

    DOI: 10.2465/jmps.99.67

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  • Ramsbeckite from the Hirao mine at Minoo, Osaka, Japan

    M Ohnishi, S Kobayashi, Kusachi, I, J Yamakawa, M Shirakami

    JOURNAL OF MINERALOGICAL AND PETROLOGICAL SCIENCES   99 ( 1 )   19 - 24   2004.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN ASSOC MINERALOGICAL SCIENCES  

    Ramsbeckite was found as a vein forming mineral in altered shale at the Hirao mine, Minoo, Osaka, Japan. It occurred as aggregates of euhedral granular crystals up to 0.5 mm across, in association with sphalerite, chalcopyrite, smithsonite, aurichalcite, amorphous manganese dioxide, schulenbergite, brochantite, serpierite, limonite and an unidentified mineral. It was emerald green to blue-green in color with a vitreous luster in hand specimen. An EPMA and CHNS/O analyzer gave the empirical formula (Cu(9.380)Zn(5.54)2Ni(0.034)Co(0.027)Fe(0.020) Mn-0.013)(Sigma 15.016)[(SO4)(3.871)(CO3)(0.166)](Sigma 4.037)(OH)(21.958)center dot 6.06H(2)O on the basis of O = 44. The unit cell parameters were a = 16.106 (3), b = 15.568 (2), c = 7.109 (1), angstrom, beta = 90.23 (1)degrees, and Z = 2. The mineral was optically biaxial negative with refractive indices alpha = 1.676, beta = 1.704 and gamma = 1.707, and 2V(X)(calc) = 37.8 degrees. The Vickers micro-hardness was 162 (144-182) kg/mm(2) ( 10 g load), and the Mohs hardness was 3.5. The measured density was 3.36 g/cm(3). It is likely that ramsbeckite at the Hirao mine crystallized from Cu and Zn-bearing fluids.

    DOI: 10.2465/jmps.99.19

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  • Effects of the counterion on dielectric spectroscopy of a montmorillonite suspension over the frequency range 10(5)-10(10) Hz

    T Ishida, M Kawase, K Yagi, J Yamakawa, K Fukada

    JOURNAL OF COLLOID AND INTERFACE SCIENCE   268 ( 1 )   121 - 126   2003.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACADEMIC PRESS INC ELSEVIER SCIENCE  

    Dielectric measurements were carried out on suspensions of montmorillonite clay exchanged with three different counterions: sodium, ammonium, and tetramethylammonium (TMA). Only two dielectric absorption peaks could be identified for the clay sample with the TMA counterion, whereas three peaks were found for the two inorganic counterions. The dielectric process observed at around 10 GHz is due to the orientation of bulk water molecules, judging from the relaxation time and relaxation strength. The relaxation strength of the process occurring at around 10 MHz was compared with the coefficient of adiabatic compressibility obtained from ultrasound velocity measurements. The increase in the relaxation strength with decreasing compressibility indicates that the process at around 10 MHz is caused by the orientation of bound water molecules on the clay samples. The relaxation strength of the process occurring at around 10 MHz for the TMA sample was remarkably small. Furthermore, the network structure of the bound water molecules can be characterized by a property peculiar to the TMA sample, taking into account the value of its Cole-Cole parameter. Results for the relaxation strength of the process occurring at around 100 kHz were compared with those for electrophoretic mobility. This comparison revealed that discrimination between bound ions and ions in the diffuse double layer is important, and both the relaxation and electrophoretic results could be satisfactorily explained by surface polarization of the clay. (C) 2003 Elsevier Inc. All rights reserved.

    DOI: 10.1016/S0021-9797(03)00688-X

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  • High-pressure phase relationships for FeS

    S Urakawa, M Hasegawa, Y Yamakawa, KI Funakoshi, W Utsumi

    HIGH PRESSURE RESEARCH   22 ( 2 )   491 - 494   2002.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:TAYLOR & FRANCIS LTD  

    Phase relationships for FeS polymorph have been studied at the pressure of 16-20 GPa and temperature of 300-1350 K by in situ X-ray observation using a large volume high-pressure apparatus and a synchrotron radiation. Contrary to Fei's prediction [1], we found the stability field of NiAs-type phase of FeS extending at least to 18 GPa. Results of in situ X-ray observation correspond with the NiAs-hexagonal phase boundary determined by Kusaba et al. [2,3], Assuming the straight NiAs-hexagonal phase boundary, we estimate that the NiAs-hexagonal-liquid triple junction is located at 39.5 GPa and 2300 K.

    DOI: 10.1080/08957950290006866

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  • Baghdadite from Fuka, Okayama Prefecture, Japan

    Kanako Shiraga, Isao Kusachi, Shoichi Kobayashi, Junji Yamakawa

    Journal of Mineralogical and Petrological Sciences   96 ( 2 )   43 - 47   2001

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Tohoku University  

    Baghdadite was found in a spurrite zone in skarns at Fuka, Okayama Prefecture, Japan. It occurs as anhedral grains up to 0,5 mm in length and prismatic crystals up to 0.6×0.4×0.2 mm, in association with gehlenite, spurrite, tilleyite, peroéskite, grandite garnet and éesuéianite. The empirical formula of the mineral is (Ca3.03Na0.01)∑3.04(Zr 0.83Ti0.15)∑0.98(Si1.99Al 0.01Fe0.01)∑2.01O9 on the basis of O=9, which is consistent with the ideal formula Ca3ZrSi2O9. The unit cell parameters are a= 10.429(2), b= 10.170(2), c=7.365(1)A and β = 91.01(1)°. The mineral is optically biaxial negatiée with refractiée indices a= 1.735, β= 1.747, and γ= 1.755, and calculated 2 V = 1W. The Vickers microhardness is 803 kg mm2 (25 g load) and the density is 3.36 g cm3. It is likely that baghdadite at Fuka was formed by a reaction of pre-existing rankinite and/ or kilchoanite, and ZrO2 eéoléed from an intrusiée igneous liquid at a high temperature.

    DOI: 10.2465/jmps.96.43

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  • Kinoite from Fuka, Okayama Prefecture, Japan

    Isao Kusachi, Makoto Nishimura, Kanako Shiraga, Shoichi Kobayashi, Junji Yamakawa

    Journal of Mineralogical and Petrological Sciences   96 ( 1 )   29 - 33   2001

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Tohoku University  

    Kinoite was found in a dump at the Fuka mine, Okayama Prefecture, Japan. It occurs as aggregates of flaky crystals, and rarely as subhedral platy crystals up to 1 mm wide in a vein cutting into crystalline limestone. Associated minerals are stringhamite, calcite and an unidentified mineral. The empirical formula of the mineral is (Ca2.00Mga0.02)∑2.02(Cu 1.92Fe0.04Co0.04)∑2.00Si 2.98O10 · 2.25H2O on the basis of O=10 (anhydrous). The unit cell parameters are a=6.989 (1), b=12.904 (2), c=5.659 (1) Å, and β=96.15 (2)°. The mineral is optically biaxial negative with refractive indices α= 1.642 (2), β= 1.662 (2), and γ= 1.675 (2). The Vickers microhardness is 536 kg mm-2 (50 g load) and the density is 3.14 g cm-3. It is likely that kinoite at the Fuka mine was formed as a primary mineral by a reaction of Cu- and Si-bearing fluids with limestone.

    DOI: 10.2465/jmps.96.29

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  • The crystal structure of scapolite in the Luetzow-Holm Bay region, East Antarctica

    Yamakawa Junji, Ando Yumi, Osanai Yasuhito, Kusachi Isao

    Polar geoscience   14   139 - 156   2001

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  • Uralborite from Fuka, Okayama Prefecture, Japan

    Isao Kusachi, Kanako Shiraga, Shoichi Kobayashi, Junji Yamakawa, Yasushi Takechi

    Journal of Mineralogical and Petrological Sciences   95 ( 4 )   43 - 47   2000

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Tohoku University  

    Uralborite, CaB2O2(OH)4, was found in a vein consisting of borate minerals that cut into crystalline limestone at Fuka, Okayama Prefecture, Japan. It occurs as aggregates of fibrous crystals up to 0.2 mm long and as euhedral crystals up to 7 mm long and 3 mm wide, in association with sibirskite, borcarite, fluorite and calcite. Electron microprobe analyses and ICP gave the empirical formula Ca1.006B2.019O2.069(OH)3.931 on the basis of O=6. X-ray powder diffraction were indexed on the monoclinic cell, a=6.923(1), b=12.326(1), c=9.831(1)Å, β=97.09(1)°, determined by a single crystal method. The mineral was optically biaxial positive with refractive indices α=1.605(2), β=1.611(2), γ=1.618(2). The Vickers microhardness was 372 kg mm-2 and the Moh's scale of hardness was 4.5. The density was 2.58(2) g cm-1. It is likely that uralborite at Fuka was formed as a secondary mineral by a late-hydrothermal alteration of sibirskite.

    DOI: 10.2465/jmps.95.43

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  • Hexahydroborite from Fuka, Okayama Prefecture, Japan

    KUSACHI Isao, TAKECHI Yasushi, KOBAYASHI Shoichi, YAMAKAWA Junji, NAKAMUTA Yoshihiro, LEE Kyue-Hyung, MOTOMIZU Shoji

    Journal of Mineralogical and Petrological Sciences   21 ( 1 )   9 - 14   1999

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    Language:English   Publisher:Japan Association of Mineralogical Sciences  

    Hexahydroborite was found in a vein consisting of borate minerals which developed along the boundary between crystalline limestone and skarns at Fuka, Okayama Prefecture, Japan. Hexahydroborite occurred as aggregates of pyramidal crystals up to 2mm wide on the cavity wall, in association with olshanskyite and calcite. Wet analyses and ICP-MS gave the empirical formula Ca1.001B2.102O4.154·5.846H2O on the basis of O=10, which was consistent with the ideal formula Ca[B(OH)4]2·2H2O. The reflections of X-ray powder data for hexahydroborite from Fuka were indexed on the monoclinic cell, a=16.011(2), b=6.688(1), c=7.954(2)Å, β=103.81(1)°, determined by single crystal method. The mineral was optically biaxial positive with refractive indices α=1.502(2), β=1.505(2), γ=1.509(2) and had a Mohs hardness of 2.5 and a density of 1.84gcm−3. It is likely that hexahydroborite at Fuka was formed by a reaction of ground water with sibirskite and/or parasibirskite at a low temperature around 25°C.

    DOI: 10.2465/minerj.21.9

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  • Un Monophosphate Synthetique de Sodium et de Cobalt : Na4Co7(PO4)6

    Dilshat Kobashi, Shizuo Kohara, Junji Yamakawa, Akira Kawahara

    Acta Crystallographica   C54   7 - 9   1998

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  • Structure of a synthetic dicobalt diphosphate: Co2P2O7

    Dilshat Kobashi, Shizuo Kohara, Junji Yamakawa, Akira Kawahara

    Acta Crystallographica, Section C: Crystal Structure Communications   53 ( 11 )   1523 - 1525   1997.1

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    Language:French   Publishing type:Research paper (scientific journal)   Publisher:Munksgaard Int Publ. Ltd.  

    The title compound, a new polymorphic phase of dicobalt diphosphate, Co2P2O7, was prepared by hydrothermal methods. The structure contains CoO6 coordination octahedra and P2O7 groups. The CoO6 octahedra are connected by edge sharing to form six-membered rings, which are further interconnected to form two-dimensional zigzag sheets parallel to (001). The P2O7 groups link these sheets to build three-dimensional networks.

    DOI: 10.1107/S0108270197006689

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  • SYNTHETIC MAGNESIUM SODIUM-HYDROGEN MONOPHOSPHATE - MGNA3H(PO4)(2)

    A KAWAHARA, J YAMAKAWA, T YAMADA, D KOBASHI

    ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS   51 ( C51 )   2220 - 2222   1995.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:MUNKSGAARD INT PUBL LTD  

    The structure belongs to the monophosphate group and contains one type of PO4 tetrahedra connected to one type of MgO6 octahedra by corner sharing. These PO4-MgO6 groups are connected along the two shorter a and b axes to form two-dimensional zigzag sheets. Two sheets are connected along the longer c axis by two types of Na-O polyhedra. Pairs of PO4 tetrahedra in the sheets are connected by H atoms situated at the centres of symmetry, forming short hydrogen bonds.

    DOI: 10.1107/S0108270195006901

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  • System for monitoring the vacuum of X-ray generators(A bailable use of 8 bit personal computer).

    Junji YAMAKAWA, Akira KAWAHARA

    Okayama University Earth Science Report   2 ( 1 )   103 - 108   1995

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  • REFINEMENT OF THE STRUCTURE OF SYNTHETIC SODIUM ZINC MONOPHOSPHATE

    J YAMAKAWA, WATANABE, I, A KAWAHARA

    ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS   50   979 - 980   1994.7

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:MUNKSGAARD INT PUBL LTD  

    The title structure, Zn2NaH(PO4)2, belongs to the monophosphate group and contains two kinds of PO4 tetrahedra connected by two kinds of ZnO4 distorted tetrahedra. These four kinds of tetrahedra are connected by corner sharing to form sheets parallel to the ac plane. The PO4 tetrahedra are isolated from each other in the sheets. The Na and H atoms are located between the sheets. The Na atoms have six O atoms as nearest neighbours. The H atoms are connected to the apex O atoms of two adjacent sheets by hydrogen bonding.

    DOI: 10.1107/S0108270193014337

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  • Crystal structure of Synthetic zinc monophosphate Zn2(OH)PO4. A polymorph of tarbuttite

    KAWAHARA Akira, MORITANI Hiromi, YAMAKAWA Junji

    Journal of Mineralogical and Petrological Sciences   17 ( 3 )   132 - 139   1994

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    Language:English   Publisher:Japan Association of Mineralogical Sciences  

    The syntheses of zinc hydroxyl monophosphate Zn2(OH)PO4 were carried out under hydrothermal conditions of 573 K and 200 kg/cm2. The crystal data are: orthorhombic, P21212, a=8.099(1), =8.325(1) and c=5.966(1) Å. The structure was solved by three dimensional Patterson syntheses and refined by least squares methods to give a final residual index of R=0.042. There are four units of Zn2(OH)PO4 in a unit cell and three kinds of zinc atoms with different coordinations, where the first zinc atom is six-coordinated by four oxygen atoms and two hydroxyl groups, the second one is octahedrally coordinated by six oxygen atoms and the third one is five-coordinated by four oxygen atoms and one hydroxyl group forming distorted pyramids. The framework consists of infinite straight chains of Zn–O octahedra along c-axis, connected together by isolated PO4 tetrahedra and distorted Zn–O pyramids. This compound is a polymorph of tarbuttite.

    DOI: 10.2465/minerj.17.132

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  • Un Monophosphate de Magnesium et de Sodium

    J YAMAKAWA, T YAMADA, A KAWAHARA

    ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS   50 ( C50 )   986 - 988   1994

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    Authorship:Lead author   Language:French   Publishing type:Research paper (scientific journal)   Publisher:MUNKSGAARD INT PUBL LTD  

    The title compound, magnesium sodium phosphate, Mg5Na2(PO4)4, belongs to a group of monophosphates which are constructed from five kinds of coordination polyhedra: two kinds of Po4 tetrahedra are connected by one type of Mg-O octahedra situated at the centres of symmetry; distorted five-coordinated Mg-O polyhedra and another type of distorted Mg-O octahedra are in general positions. Na-O polyhedra occupy the cavities formed by these five types of coordination polyhedra. The density, D(x), of this compound is 3.00 Mg m-3, reflecting the high-pressure synthesis. Similar compounds precipitated at 1 atm. (101.325 kPa) have densities of 2.55-2.82 Mg m-3, corresponding to the lower pressure condition.

    DOI: 10.1107/S0108270193012004

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  • Syntheses and X-ray studies of kimzeyite, Ca3Zr2(Al, Fe)2SiO12

    Junji YAMAKAWA, Chiyoko Henmi, Akira KAWAHARA

    Mineralogical Journal   17 ( 3 )   371 - 377   1993

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    DOI: 10.2465/minerj.16.371

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Books

  • Chemistry in the Elementary course of the College

    Masaya KAWASE, Junji YAMAKAWA( Role: Joint author)

    Kagaku Dojin  2012 

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  • LaTeX by examples

    Makoto HIRAMATSU, Yasushi MATSUSHIMA, Junji YAMAKWA( Role: Joint author)

    Baifu kan  1995  ( ISBN:4563013811

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  • An Investigation on “Ae” of Real-time Online Lecture at the Okayama university - Using the YouTube Live + OBS Studio and Google Classroom Web Applications

    Junji YAMAKAWA, Hiroshi TAKAHAATA

    Bulletin of Center for Teacher Education and Development, Okayama University   12   33 - 46   2022.3

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    DOI: 10.18926/cted/63296

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  • Google classroom and Chromebook as an Educational IT system

    Junji YAMAKAWA, Hiroshi TAKAHATA

    Bulletin of Center for Teacher Education and Development, Okayama University   9 ( 1 )   1 - 12   2019.3

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    DOI: 10.18926/CTED/56536

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  • A high precision and high resolution estimation of the spatial distribution of PM2.5 in the south area of Okayama prefecture, Japan

    Akiho Omori, Junji Yamakawa

    Okayama University Earth Science Reports   21 ( 1 )   1 - 5   2014

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  • The Web=based Interactive three-dimensional Crystal Structure Materials for Scientific Education

    Junji Yamakawa

    Bulletin of Center for Teacher Education and Development, Okayama University   3 ( 1 )   27 - 31   2013

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  • 瀬戸内海中部上空におけるSPM濃度分布の推定

    海老貴宏, 松本宏文, 山川純次

    岡山大学地球科学研究報告   19 ( 1 )   19 - 24   2012

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  • Chemical processing technology to be associated jewel

    Junji YAMAKAWA

    Monthly Chemistry   67 ( 3 )   24 - 28   2012

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    CiNii Article

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    Other Link: http://ousar.lib.okayama-u.ac.jp/52208

  • Estimation of SPM concentration distribution over the central Seto inland sea

    Takahiro Ebi, Hirofumi Matsumoto, Junji Yamakawa

    Okayama University Earth Science Reports   19 ( 1 )   19 - 24   2012

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  • The temperature and pressure conditions of synthetic Sibirskite and Parasibirskite

    Masahiro Kano, Junji Yamakawa

    Okayama University Earth Science Reports   19 ( 1 )   13 - 17   2012

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  • Design and Implemenmtation of e-Learning System at the Faculty of Science, Okayama University

    Junji Yamakawa, Tsugio Shibata

    Bulletin of Center for Teacher Education and Development, Okayama University   2 ( 1 )   120 - 125   2012

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  • llustrated birthstones by a mineralogist (6)

    Junji YAMAKAWA

    Monthly Chemistry   66 ( 6 )   51 - 51   2011.6

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  • Illustrated birthstones by a mineralogist (4)

    Junji YAMAKAWA

    Monthly Chemistry   66 ( 4 )   46 - 46   2011

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  • Illustrated birthstones by a mineralogist (5)

    Junji YAMAKAWA

    Monthly Chemistry   66 ( 5 )   43 - 43   2011

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  • KED estimated distribution of Earth Scientific Information

    Junji YAMAKAWA, Takahiro EBI, Hirofumi MATSUMOTO

    Okayama University Earth Science Report   18 ( 1 )   1 - 3   2011

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  • Illustrated birthstones by a mineralogist (2)

    Junji YAMAKAWA

    Monthly Chemistry   66 ( 2 )   46 - 46   2011

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  • Illustrated birthstones by a mineralogist (8)

    Junji YAMAKAWA

    Monthly Chemistry   66 ( 8 )   51 - 51   2011

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  • Illustrated birthstones by a mineralogist (9)

    Monthly Chemistry   66 ( 9 )   47 - 47   2011

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  • Illustrated birthstones by a mineralogist (7)

    Junji YAMAKAWA

    Monthly Chemistry   66 ( 7 )   51 - 51   2011

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  • Illustrated birthstones by a mineralogist (10)

    Junji YAMAKAWA

    Monthly Chemistry   66 ( 10 )   43 - 43   2011

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  • Illustrated birthstones by a mineralogist (3)

    Junji YAMAKAWA

    Monthly Chemistry   66 ( 3 )   46 - 46   2011

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  • Illustrated birthstones by a mineralogist (11)

    Monthly Chemistry   66 ( 11 )   43 - 43   2011

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  • Illustrated birthstones by a mineralogist (12)

    Junji YAMAKAWA

    Monthly Chemistry   66 ( 12 )   51 - 51   2011

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  • Representation of Earth scientific information by the GoogleTM Earth

    Junji YAMAKAWA, Takahiro EBI, Hirofumi MATSUMOTO

    OKAYAMA University Earth Science Reports   17 ( 1 )   25 - 26   2010

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  • DGEM: Digital Geological Elevation Model

    Junji YAMAKAWA, Takahiro EBI, Hirofumi MATSUMOTO

    OKAYAMA University Earth Science Reports   17 ( 1 )   21 - 23   2010

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  • Native gold from Mikawa mine, Niigata Prefecture, Japan

    Junji Yamakwa, Mitsuo Tanabe, Kazumasa Shimada, Chiyoko Henmi

    Okayama University Earth Science Reports   7 ( 1 )   19 - 20   2000

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  • A microcomputer-controlled gradual cooling system for hydrothrmal reactors

    Junji Yamakawa, Akira Kawahara

    Okayama University Earth Science Reports   3 ( 1 )   65 - 70   1996

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    CiNii Article

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  • CALCOMP to LIPS3 convert library

    Junji Yamakawa

    Okayama University Earth Science Report   1 ( 1 )   37 - 48   1994

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  • LISTHKL : List h, k, l, Fo and sFo tables

    Junji Yamakawa

    Okayama University Earth Science Report   1 ( 1 )   49 - 52   1994

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Presentations

  • Estimation and representation of wind vector field of Kobe-city by Kriging method

    Junji YAMAKAWA

    2022.12.17 

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  • Map representation of wind distribution model in Kobe city, Japan

    Junji YAMAKWA, Maho OKUTANI

    JpGU Meeting 2022  2022.5.26 

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  • Presentation of interval estimations of the environmental pollutant by R and WebGIS

    Junji YAMAKAWA

    2021.12.18 

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  • Modeling of a distribution of structural shift parameter of alpha-Quartz in the Nichioji granite body on the Northwest part of Okayama city by the Geostatistics

    Junji Yamakawa

    2021.6.18 

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  • Map representation of estimated concentration distribution of PM2.5 using WebGIS

    Junji YAMAKAWA

    2021.6.6 

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  • Map representations of interval estimations for environmental pollutants using WebGIS and R

    Junji YAMAKAWA

    JpGU-AGU Joint Meeting 2020  2020.7.16 

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  • An analysis of geographical compression effect of PM2.5 by R and GIS applications

    Junji YAMAKAWA

    JpGU Meeting 2017  2017 

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  • Crystal structure and electron density distribution of hydroxyapatite from longgu (Fossilia Ossis Mastodi) in the Kampo medicine prescription

    JpGU Meeting 2017  2017 

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  • Geostatistics analyis by R and GIS

    Junji YAMAKAWA

    2017 

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  • A spatial relationship analysis between the high resolution PM2.5 estimated distribution and transportation network by the R and the GIS applications

    Junji YAMAKAWA

    Japan Geoscience Union Meeting 2016  2016 

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  • Crystal structure analysis and investigation of the alternative materials of longgu (Fossilia Ossis Mastodi) in herbal medicine prescription

    Simposium of Structure activitiy relationship 43  2016 

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  • A high-resolution estimation of the PM2.5 distribution by the R and the GIS applications Invited

    Japan Geoscience Union Meeting 2015  2015 

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  • Effects of the buffer models in the estimation of the spatial SPM distribution at the sky of the Yokohama city

    Junji YAMAKAWA

    Japan Geoscience Union Meeting 2014  2014 

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  • The low-temperature Moessbauer spectroscopy of an M3' epidote from Osayama, Okayama prefecture, Japan

    Japan Geoscience Union Meeting 2014  2014 

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  • Estimation and representation of the spatial distribution of the structural shift of quartz sampled from a granite body by GIS applications

    Junji YAMAKAWA

    IGU Kyoto Regional Conference 2013  2013 

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  • Estimation and presentation of the spatial statistics analysis of the Earth scientific informations by R-Language

    Japan Geoscience Union Meeting 2013  2013 

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  • The temperature and pressure condition of synthetic sibirskite and parasibirskite

    2012 Annual Meeting of Japan Association of Mineralogical Sciences  2012 

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  • Estimation of the Fe site distribution and the formation temperature of Epidote by the Moessbauer Method

    2012 Annual Meeting of Japan Association of Mineralogical Sciences  2012 

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  • Application of Earth scientific information by the Google Earth

    Japan Geoscience Union Meeting 2011  2011 

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  • メスバウアー分光法による水熱合成kimzeyiteの解析

    2011日本放射化学会年会・第55回放射化学討論会  2011 

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  • The State Analysis of Fe in Natural and Synthesized Minerals by Mössbauer Spectroscopy

    The 31st International Conference on the Applications of the Mössbauer Effect  2011 

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  • Integration and visualization of some Earth scientific information and DEM

    Japan Geoscience Union Meeting 2011  2011 

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  • Moesbauer spectrogram of the Hydrothermal synthesized Kimzeyites

    2011 

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  • Distribution of Earth Scientific Information estimated using RK and Display by Google Earth

    Japan Geoscience Union Meeting 2012  2011 

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  • Estimated distribution of SPM in the sky above the Seto Inland Sea

    Japan Geoscience Union Meeting 2012  2011 

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  • The stable region of Sibirskite and Parashibirskite

    Japan Geoscience Union Meeting 2012  2011 

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  • メスバウアー効果測定による水熱合成kimzeyite中の鉄の状態解析

    日本物理学会第65回年次大会  2010 

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  • Gamma-ray spectroscopy of the beta-uranophane from Togo mine, Katamo, Yurihama, Tohaku, Tottori prefecture, Japan

    2010 Annual Meeting of Japan Association of Mineralogical Sciences  2010 

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  • Moessbauer spectroscopy of hydrothermal synthetic kimzeyite

    2010 

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  • 岡山県新見市大佐山産Epidoteのメスバウアースペクトル解析

    日本鉱物科学会2009年年会・総会  2009 

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  • Epidoteのメスバウアー分光

    日本物理学会 第62回年次大会  2007 

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  • 南極産スカポライトの結晶構造

    弟20回南極極地学シンポジウム  2000 

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Works

  • 岡山大学知恵の見本市2017

    2017

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  • 岡山大学知恵の見本市2016

    2016

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  • 岡山大学知恵の見本市2015

    2015

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  • 岡山大学知恵の見本市2014

    2014

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  • 岡山大学知恵の見本市2013

    2013

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