研究者詳細 - 山川　純次

論文 - 山川　純次

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受講効率と講義効率から見たオンライン講義 —最適なオンライン講義時間の推定の試み—

山川純次

岡山大学教師教育開発センター紀要 12 ( 1 ) 1 - 6 2023年3月

リアルタイムオンライン講義の受講効率の検証と課題 ―YouTube Live + OBS Studio とGoogle Classroom の活用―

山川純次, 髙旗浩志

岡山大学教師教育開発センター紀要 12 33 - 46 2022年3月

担当区分：筆頭著者記述言語：日本語出版者・発行元：岡山大学教師教育開発センター

岡山大学でリアルタイムオンライン講義を実施した。使用したオンラインシステムはYouTubeLiveとGoogleClassroomのWebアプリケーションを使用して作成者が新たに構築した。このシステムは，講義ビデオアーカイブを提供することも可能であった。システムの構築費と運用費はかなり低くなる可能性がある。LMSは，講義ビデオの配信に加えて，学生とのコミュニケーションを合理化するために用いた。ビデオ配信システムまたはLMSの障害が原因でオンライン講義が停止することはなかった。このシステムにより講師は講義室の設備や講義の時間割の制約から解放され，マルチメディア教材やバーチャル教材の使用が容易になった。また学生の受講効率は従来の講義形式に対して約2.9倍に向上したと考えられる。授業の構成や内容の質的問題の検証，授業内容に対する生徒の理解の深化，生徒が習得した資質や能力の内容の検証は今後の課題である。
Real-time online lecture were held at the Okayama University. The online system that used were constructed newly by the authors using the YouTube Live and Google classroom Web applications. This system could also provide a lecture video archive. The construction cost and operating cost of the system could be quite low. In addition to delivering lecture videos, the LMS was using for streamline communication with students. Lectures were never stopped due to a failure in the video delivery system or the LMS. The system freed the lecturer from the restrictions of lecture room facilities and lecture timetables, made it easier to use multimedia teaching materials and virtual teaching materials. It was also thought that the student's attendance efficiency was improved to about 2.9 times that of legacy lecture style. Verification of the qualitative problems of the lesson structure and contents, the deepening of students' understanding of the lesson contents, and the breakdown of the qualifications and abilities acquired by t he students are future t asks.

DOI： 10.18926/cted/63296

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年

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年5月

教育ITシステムとしてのGoogle classroomとChromebook

山川純次, 高旗浩志

岡山大学教師教育開発センター紀要 9 ( 1 ) 1 - 12 2019年3月

岡山県南部におけるPM2.5の高精度高解像度空間分布推定

大森秋穂, 山川純次

岡山大学地球科学研究報告(Web) 21 ( 1 ) 1 - 5 2014年

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年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

その他リンク： http://link.springer.com/article/10.1007/s10762-013-9994-2/fulltext.html

理科教育におけるWebベースの対話型3次元結晶構造教材

山川純次

岡山大学教師教育開発センター紀要 3 ( 1 ) 27 - 31 2013年

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年

記述言語：日本語出版者・発行元：岡山大学理学部地球科学教室

Ordinary Kriging, OK, and Regression Kriging, RK, are the spatial statistical methods that are possible toestimate a horizontal distribution in a study area from discrete data. OK is the method which takes account ofonly spatial auto-correlation structure of the data, while RK is the method which takes account of an interrelationshipbetween spatial auto-correlation structure and some auxiliary variables to minimize the estimation error.Analytical processing for OK and RK methods was performed by the R-Language (R Core Team, 2012)and its some additional libraries. The auxiliary variables required to perform RK method were prepared by aGIS application, Quantum GIS (Quantum GIS Development Team, 2012). The 3-dimensional geographic representationof the estimation maps was performed by the Google Earth (Google, 2012).In this report, OK and RK methods were applied to one of the Earth scientific information, SPM (SupendedParticulate Matter). Then, these methods were considered by comparing two estimation maps, and finallyconsidered qualitatively by displaying these maps in the Google Earth.

DOI： 10.18926/ESR/49210

岡山大学理学部におけるe-ラーニングシステムの導入と運用

山川純次, 柴田次夫

岡山大学教師教育開発センター紀要 2 ( 1 ) 120 - 125 2012年

シベリア石とパラシベリア石の安定温度圧力条件

狩野正裕, 山川純次

岡山大学地球科学研究報告 19 ( 1 ) 13 - 17 2012年

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年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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.

岡山県大佐山産出緑レン石のMoessbauer分光法による解析

川瀬雅也, 山川純次, 大嶋珠世子, 黒葛真行, 森本正太郎, 斎藤直

ラジオアイソトープ 60 ( 11 ) 461 - 465 2011年

KED法を用いた地球科学情報の分布推定

山川純次, 海老貴宏, 松本宏文

岡山大学地球科学研究報告 18 ( 1 ) 1 - 3 2011年

Google(TM) Earth による地球科学情報の表示

山川純次, 海老貴宏, 松本宏文

岡山大学地球科学研究報告 17 ( 1 ) 25 - 26 2010年

DGEM: 数値地質標高モデル

山川純次, 海老貴宏, 松本宏文

岡山大学地球科学研究報告 17 ( 1 ) 21 - 23 2010年

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

102 ( 4 ) 233 - 239 2007年8月

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

45 ( 2 ) 307 - 315 2007年4月

岡山県高梁市布賀鉱山産borcariteのCu置換体

大西政之, 草地功, 小林祥一, 山川純次, 田邊満雄, 岸成具, 安田隆志

日本鉱物学会年会講演要旨集 2005 118 - 118 2005年

出版者・発行元：一般社団法人日本鉱物科学会

岡山県高梁市備中町布賀の布賀鉱山からborcarite Cuが置換体を見出したので，その産状および鉱物学的性質について報告する．BorcariteのCu置換体は結晶質石灰岩を切るpentahydroborite，nifontoviteのレンズ中に3 mm以下の粒状結晶をなして産出した．この結晶の外側は無色でborcarite，内側はエメラルドグリーンを呈しborcariteのCu置換体である．本鉱物は無から淡緑色のborcarite中に細脈をなしていることもある．共存鉱物はborcarite，nifontovite，calcite，bultfonteiniteである．肉眼的にはエメラルドグリーン_から_無色透明でガラス光沢を示す．鏡下では無色透明で，多色性はみられない．二方向に完全な劈開が認められる．密度は2.96(2) g cm-3(meas)，2.96 g cm-3(calc)．ビッカース硬度は376 (290-464) kg mm-2(25 g荷重)，モース硬度は4.5．光学的には二軸性負，屈折率α＝1.618，β＝1.658，γ＝1.672，2VX(calc)＝60°．WDSおよびTGAによって得られた分析値は，CaO 38.26，CuO 11.51，MgO 0.59，ZnO 0.09，B2O3 24.27，CO2 15.33，H2O 9.28，total 99.33 wt%で，O＝18とした実験式はCa3.965(Cu0.841Mg0.085Zn0.006)？0.932 B4.040O5.941(OH)5.987(CO3)2.024．単結晶を用いて四軸自動回折計で測定した結果は，単斜晶系，ラウエ群C2/m．粉末X線回折値から計算した格子定数は，a＝17.794(2)，b＝8.381(1)，c＝4.4494(7)Å，β＝102.42(2)°．IRでは3540，3260 cm-1にO-H，1410，870，290 cm-1に炭酸基，1450，390 cm-1にホウ酸基による吸収がそれぞれ認められた．TG-DTAでは484 °CにH2Oの放出による重量減少を伴う吸熱ピーク，682 °CにCO2の放出による重量減少を伴う吸熱ピークがそれぞれ認められた．これらの結晶学的データ，赤外吸収スペクトルおよびTG-DTAはborcariteと類似している．

DOI： 10.14824/kobutsu.2005.0.118.0

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年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

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年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

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年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

大阪府箕面市温泉町産含水塩基性硫酸亜鉛鉱物について

大西政之, 小林祥一, 草地功, 山川純次

日本鉱物学会年会講演要旨集 2003 134 - 134 2003年

出版者・発行元：一般社団法人日本鉱物科学会

一般式Zn₄(SO₄)(OH)₆・mH₂Oで示される亜鉛の塩基性硫酸塩は，合成物ではm=0, 0.5, 3, 4, 5の５種が報告されている(Jacob and Riquier, 1969; Bear et al., 1986, 1987)。天然ではm=4で，CuがZnの一部を置換したnamuwite(e.g. Bevins et al., 1982; Groat, 1996)のみが報告されている。今回，大阪府箕面市温泉町の平尾旧坑から，これまでに天然では報告のない合成Zn₄(SO₄)(OH)₆・5H₂Oとほぼ一致する性質をもつnamuwite類似の含水塩基性硫酸亜鉛鉱物を見出したので，その産状および鉱物学的性質について報告する。<BR>
箕面産含水塩基性硫酸亜鉛鉱物は湿った旧坑内の坑壁表面，またはchlorite化した母岩の裂罅に，sphaleriteなどの分解による二次生成物として，最大2mmの六角薄板状結晶をなして産出した。坑壁の表面には薄板状結晶が鍾乳状に集合したものがみられた。共存鉱物はhydrozincite，smithsonite，namuwiteである。肉眼的には淡青ないし無色，透明ないし半透明で真珠光沢を示す。鏡下では無色ないし淡青色透明で，一方向に完全な劈開がみられる。主なX線粉末回折値[dÅ(I)(hkl)]は，10.93(100)(001)，2.723(26)(3-10)，1.576(24)(1-50)，3.642(20)(003)，2.560(16)(-311)，4.16(14)(1-20)，5.47(12)(002)，3.236(12)(-122)，3.409(10)(1-13)，3.285(10)(013)，2.673(10)(121)，3.409(10)(1-13)，3.285(10)(013)，2.673(10)(121)で，Bear et al.(1987)に基づいて三斜晶系として求めた格子定数は，a=8.36(3)，b=8.35(3)，c=11.02(1)，α=94.1(3)，β=83.0(2)，γ=120.0(3)°である。KBr錠剤法によるIRスペクトルは，3400cm^-1付近および1620cm^-1付近に水，1120cm^-1付近に[SO₄]による吸収を示した。EPMAによる化学分析の平均値は，ZnO 51.34，CuO 7.25，FeO 0.13，MnO 0.12，NiO 0.12，CoO 0.02，SO₃ 15.84，H₂O 25.18 (差)，total 100 wt%で，O=15としたときの実験式は(Zn_3.481Cu_0.503Fe_0.010Mn_0.009Ni_0.009Co_0.001)_Σ4.010(SO₄)_1.092(OH)_5.843・4.79H₂Oである。Zn/(Zn+Cu) は0.82-0.93を示した。

DOI： 10.14824/kobutsu.2003.0.134.0

High-pressure phase relationships for FeS

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

HIGH PRESSURE RESEARCH 22 ( 2 ) 491 - 494 2002年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

大阪府箕面市温泉町産ramsbeckiteについて

大西政之, 小林祥一, 草地功, 山川純次, 白神正夫

日本鉱物学会年会講演要旨集 2002 42 - 42 2002年

大阪府箕面市温泉町産schulenbergiteのZn置換体について

大西政之, 小林祥一, 草地功, 山川純次

日本鉱物学会年会講演要旨集 2002 32 - 32 2002年

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

Junji Yamakawa, Yumi Ando, Yasuhito Osanai, Isao Kusachi

Polar Geoscience 14 139 - 156 2001年

担当区分：筆頭著者記述言語：英語

The crystal structure of scapolite from the Liitzow-Holm Bay region, East Antarctica with cell formular (Na_<1.97>Ca_<1.48>K_<0.46>Mg_<0.03>) _<3.94> (Al_<4.15>Si_<7.85>Fe_<0.01>) _<12.01>O_<24.00> (Cl_<0.65>(CO_3) _<0.42>) _<1.07>, Me_<39>, was determined in tetragonal, P4_2/n, a=12.122(2); c=7.585(2) A by the single crystal X-ray diffraction method. The structure is the same as that of meionite but with some difference in atomic coordinates and Al percentage in the tetrahedon. The CO_3 groups were mainly disordered on the xy plane and off-centred from the Anion site. The cation site was 8-coordinate rather than 6-coordinate.

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年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

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年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

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年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

新潟県東蒲原郡三川村三川鉱山産の自然金

山川純次, 田邊満雄, 島田和昌, 逸見千代子

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

担当区分：筆頭著者記述言語：日本語出版者・発行元：岡山大学理学部地球科学教室

Native gold was found at Mikawa mine, Niigata Prefecture, Japan. The mineral was associated with quartz in a druse within quartz-vein in propyrite. The crystals were formed in filiform, reticulated and dendritic shapes with about 1 mm length with 0.1 mm width and 0.05 mm thickness. Very malleable and ductile, opaque and yellow with metallic luster. Qualitative and semi-quantiative analyses were performed by the wavelength dispersive EPMA. Quantitatively, the crystals contained Au, Ag and Hg. Semi-quantitative analyses were executed with ZAF correction algorithm. The results showed that these specimens had a average chemical composition Au0.77 Ag0.11Hg0.12. This specimen was archived at our site with a collection number ESO-M01001.

Hexahydroborite from Fuka, Okayama Prefecture, Japan

Isao Kusachi, Yasushi Takeuchi, Shoichi Kobayashi, Junji Yamakawa, Yoshihiro Nakamuta, Kyue-Hyung Lee, Shoji Motomizu

Mineralogical Journal 21 ( 1 ) 9 - 14 1999年

記述言語：英語出版者・発行元：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 Ca_1.001B_2.102O_4.154·5.846H₂O 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

Un Monophosphate Synth6tique de Sodium et de Cobalt: Na4Co7(PO4)6

Dilshat Kobashi, Shizuo Kohara, Junji Yamakawa, Akira Kawahara

Acta Crystallographica Section C: Crystal Structure Communications 54 ( 1 ) 7 - 9 1998年

記述言語：フランス語掲載種別：研究論文（学術雑誌）出版者・発行元：Blackwell Munksgaard

Tetrasodium heptacobalt hexaphosphate, a new monophosphate prepared by hydrothermal methods, comprises CoO6 and CoO4 coordination polyhedra connected to each other by corner and edge sharing to form zigzag layers parallel to the ab plane. These layers are interconnected by Co-O polyhedra and P-O tetrahedra via corner sharing to form a three-dimensional network. The Na+ ions are located in the tunnels running parallel to the a axis. This compound is isostructural with Na4Ni7(PO4)6. © 1998 International Union of Crystallography all rights reserved.

DOI： 10.1107/S010827019701189X

Structure d''un Diphosphate Synthetique de Cobalt : Co₂P₂O₇

Dilshat Kobashi, Shizuo Kohara, Junji Yamakawa, Akira Kawahara

Acta Crystallographica 53 ( 11 ) 1523 - 1525 1997年1月

マイコンを利用した水熱合成炉徐冷制御装置の作成

山川純次, 河原昭

岡山大学地球科学研究報告 3 ( 1 ) 65 - 70 1996年

担当区分：筆頭著者記述言語：日本語出版者・発行元：岡山大学理学部地球科学教室

A used 8 bit microcomputer is applied for an instrument of controlling the heating temperatures of hydrothermal reactor furnaces. The temperatures were changed into appropriate values of voltage by thermocouples and additional devices. The interface board, programmable peripheral interface LSI and some IC's for addres decording are assembled into a complte unti. The device is useful for the inexpensive way of the construction of the accurate temperature control system.

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年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

X線発生装置真空度監視システムの試作(8ビットパソコンの有効利用)

山川純次, 河原昭

岡山大学地球科学研究報告 2 ( 1 ) 103 - 108 1995年

合成Na-Znリン酸塩の結晶構造の精密化

山川純次, 渡辺勲, 河原昭

50 979 - 980 1994年7月

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

Akira Kawahara, Hiromi Moritani, Junji Yamakawa

Mineralogical Journal 17 ( 3 ) 132 - 139 1994年

記述言語：英語出版者・発行元：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

Un Monophosphate de Magnesium et de Sodium

Junji Yamakawa, Tadashi Yamada, Akira Kawahara

Acta Crystallographica 50 ( C50 ) 986 - 988 1994年

CALCOMPからのLIPS3への変換ライブラリの作成

山川純次

岡山大学地球科学研究報告 1 ( 1 ) 37 - 48 1994年

単結晶強度データリスト作成プログラムLISTHKL

山川純次

岡山大学地球科学研究報告 1 ( 1 ) 49 - 52 1994年

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

Junji Yamakawa, Chiyoko Henmi, Akira Kawahara

Mineralogical Journal 17 ( 3 ) 371 - 377 1993年

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