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NMR Characterization of Ga-or Fe-MCM-41 and its Comparison with MFI-type Ga-or Fe-silicate
Takeguchi, Tatsuya,Kim, Jin-Bae,Inui, Tomoyuki 전남대학교 촉매연구소 1997 촉매학술발표회 Vol.- No.14
It has been reported that incorporation of Fe or Ga into the framework of MFI zeolite structure exhibits excellent functions, such as gasoline synthesis [1] and aromatization [2]. On the other hand, Mobil has patented a family of mesoporous molecular sieve materials designated MCM-41 [3], while Inagaki et al. also have prepared the mesoporous materials from Kanemite [4]. These materials have their uniform and relatively large pore diameter ranging from 15 to 100 Å [3]. Application to the catalyst is promising especial for bulky hydrocarbons or rapid conversion due to low diffusion resistance resulting from larger pore sizes [5]. In this study, the effect of incorporation of Ga and Fe into the MFI zeolite and MCM-41 was examined.
Takeguchi Kota,Chantana Jakapan,Nakayama Koichi,Kawano Yu,Nishimura Takahito,Hishikawa Yoshihiro,Minemoto Takashi 한국물리학회 2021 Current Applied Physics Vol.28 No.-
Spectral mismatch correction factor (MM) is determined by average photon energy (APE). APE based on wide solar spectral ranges leads to better description of solar spectral shape. Moreover, error between corrected outdoor short-circuit current (ISC) of PV module and its ISC under standard test conditions is investigated using PV module irradiance sensor (PVMS) and/or MM, where PVMS is a single-crystalline silicon PV module. The error of muti-crystalline silicon (mc-Si) PV module is as low as about 1% regardless of the use of MM attributed to small spectral mismatch between PVMS and mc-Si PV module. On the other hand, the low error of CdTe test PV module is obtained under the use of both PVMS and MM caused by the high spectral mismatch between PVMS and CdTe test PV module. The error is further decreased, when MM is estimated from the APE based on wide ranges of the solar spectrum.
日本語學,日本語敎育學 篇 : 繼承語敎育における父親の役割 -韓國における大學日本語敎員を對象に-
다케구치토모유키 ( Takeguchi Tomoyuki ) 한국일어일문학회 2011 日語日文學硏究 Vol.77 No.1
本硏究は、日本に住む異言語間家庭の子どもへの、繼承語としての日本語敎育について調査、分析したものである。從來行われていた繼承語についての親の調査は、主に母親の意識についてのものが多く、父親を對象とした硏究はまだまだ絶對數が少ないのが實情である。本硏究では韓國人妻を持つ日本人夫4名を對象にインタビュ―を行い、子どもの日本語に敎育的な동きかけや意職を分析した。修正版グラウンデッド·セオリ―·アプロ―チ(M-GTA)によって分析を進めていった結果、25の槪念が抽出された。またこれらの槪念は、父親の敎育歷の高さや學識の高さを表す【父親の文化繼承】、家庭內の調和を表す【家庭環境整備】、敎育方略が具現化された【インプット·アウトプット過程】、韓國內の言語狀況を表す【韓國言語社會認識】というカテゴリ―に收斂された。これらの諸カテゴリ―は【父親の文化繼承】を中心に關連しあっている。M-GTAは地域密着、領域限定というのが大きな特色である。このため、從來認識されている繼承語敎育についての調査とは異なる見解が出た。さらに父親の繼承語敎育の重要性が明らかになった。今後はさらに調査協力者を募り、今回得た暫時的理論の確認を行うことが必要となってくる。
Heo, Y.U.,Takeguchi, M.,Furuya, K.,Lee, H.C. Elsevier Science 2009 Acta materialia Vol.57 No.4
The transformation of the grain boundary hexagonal close-packed η-Ni<SUB>3</SUB>Ti (DO<SUB>24</SUB>) precipitates to face-centered cubic austenite (γ) was investigated in an Fe-Ni-Ti alloy using transmission electron microscopy. The heterogeneous nucleation of austenite on the (0001) basal plane of the η-Ni<SUB>3</SUB>Ti precipitate was identified. During the growth of the interface austenite, ordered face-centered cubic (fcc) (L1<SUB>2</SUB>) γ'-Ni<SUB>3</SUB>Ti phase was formed in the η-Ni<SUB>3</SUB>Ti by the climbing of the b->=14[0001] edge dislocations. The diffusion of iron from austenite to the γ'-Ni<SUB>3</SUB>Ti phase was detected by electron energy loss spectroscopy analysis, resulting in the disordering of the γ'-Ni<SUB>3</SUB>Ti phase. The transformation sequence is schematically suggested and the transformation mechanism was discussed based on the misfit strain in the η/γ interface.
Sung Kang,배동식,Masaki Takeguchi,Ki-Jung Hong,Chang-Hwan Chang,Mahoto Takeda 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.3
The microstructures formed in a Cu75-Fe5-Ni20 alloy on isothermal annealing at 1073K were investigated by means of transmission electron microscopy (TEM) and the EELS element mapping technique, to com-pare with the precipitation phenomena occurring at 873K. Cubic and rod precipitates were simultane-ously formed in the copper matrix in the initial stage of annealing at 1073K. This feature shows a sharp contrast to the feature observed at 873K, since only cubic precipitates were observed in the specimens isothermally aged at lower temperatures. The cubic precipitates tend to stretch their shapes along one of the <100> directions of the Cu matrix and to have rectangular shapes in the late stage of the annealing at both temperatures. This tendency was, however, more clearly observed in the specimen receiving the iso-thermal annealing at 1073K.
( Tomoyuki Inui ),( Kotaro Ichino ),( Isao Matsuoka ),( Tatsuya Takeguchi ),( Shinji Iwamoto ),( Shu Bin Pu ),( Sei Ichi Nishimoto ) 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.6
Development in highly active catalysts for the reforming of methane with CO₂and partial oxidation of methane was conducted to produce hydrogen and carbon monoxide with high reaction rates. An Ni-based four-components catalyst, Ni-Ce₂O₃-Pt-Rh, supported on an alumina wash-coated ceramic fiber in a plate shape was suitable for the objective reaction. By combining the catalytic combustion of ethane or propane, methane conversion was markedly enhanced, and a high space-time yield of syngas, 25,000 ㏖/ℓ·h was obtained at a catalyst temperature of 700℃ or furnace temperature of 500℃. The extraordinary high space-time yield of syngas was also confirmed even under the very rapid flow rate conditions as a contact time of 3 m-sec by using a monolithic shape of catalyst bed without back pressure.
Inui, Tomoyuki,Ichino, Kotaro,Matsuoka, Isao,Takeguchi, Tatsuya,Iwamoto, Shinji,Pu, Shu Bin,Nishimoto, Sei-ichi 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.6
Development in highly active catalysts for the reforming of methane with CO₂and partial oxidation of methane was conducted to produce hydrogen and carbon monoxide with high reaction rates. An Ni-based four-components catalyst, Ni-Ce₂O₃-Pt-Rh, supported on an alumina wash-coated ceramic fiber in a plate shape was suitable for the objective reaction. By combining the catalytic combustion of ethane or propane, methane conversion was markedly enhanced, and a high space-time yield of syngas, 25,000 ㏖/ℓ·h was obtained at a catalyst temperature of 700℃ or furnace temperature of 500℃. The extraordinary high space-time yield of syngas was also confirmed even under the very rapid flow rate conditions as a contact time of 3 m-sec by using a monolithic shape of catalyst bed without back pressure.