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Fabrication of La2O3-TiO2-SiO2 System Glass Derived from a Sol-Gel Process
Mitsunobu Iwasaki,Hitoshi Masaki,Seishiro Ito,박원규 한국세라믹학회 2007 한국세라믹학회지 Vol.44 No.3
La2O3-TiO2-SiO2 glass, a type that could not obtained so far by the conventional melting method, was prepared successfully using a sol-gel process. Glass derived with the sol-gel process has compositions of 5La2O3-5TiO2-90SiO2, 5La2O3-10TiO2-85SiO2, and 5La2O3-20TiO2-75SiO2. The UV-visible absorption edge of all glass compositions was below 400 nm. The measured density is in the range of 2.55-2.89, and was nearly identical to the calculated density and the refractive index of the glasses derived from the sol-gel ranges from 1.545 to 1.645. The molar additive coefficient of TiO2 measured in this ternary system is lower than the calculated value, while the value of La2O3 is higher.
Mitsunobu, S.,Suzuki, Y.,Watanabe, K.,Yang, K.,Kim, J.W. Elsevier 2018 Chemical geology Vol.501 No.-
<P><B>Abstract</B></P> <P>In the present study, we investigated secondary products formed on the surface of altered basaltic glass from the sediment-basalt interface by multiple characterizations with EPMA, μXANES, μEXAFS, TEM, and EELS. μXANES and EPMA analyses showed that secondary products with high Fe abundance were precipitated on the surface of basalt glass and that the Fe species in the secondary product was dominantly composed of Fe(III) oxides, hematite, which was also agreeable with EELS result. Characterization by TEM and μEXAFS suggested that the hematite was nanoparticulate with particle size of 10–20 nm. This is the first study showing the occurrence of nanosized hematite as secondary products in altered basaltic glass, although there are many studies on the formation of Fe(III) (hydr)oxides in basalt alteration.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Altered submarine basaltic glass from sediment-basalt interface in South Pacific Gyre </LI> <LI> Micro- and nano-scale characterizations by μXAFS and TEM techniques </LI> <LI> Occurrence of nanosized hematite as secondary products in altered basaltic glass </LI> </UL> </P>
Mitsunobu Hibino 한국항만경제학회 1994 韓國港灣經濟學會誌 Vol.10 No.-
It was during the period of high economic growth in the 1960' s that ports called social attention as a part of environmental problem8 in Japan. Port8 were built because Japan had to greatly depend upon countries overseas for their natural resources to make our large consumption here possible. This generated pollution and environmental problems in the middle of the 1960' s. Finally the national Diet became concerned with these problems, and the roles that ports had to play began to be discussed. Richness we can get from 'materials' began to be reflected on national policies.<br/> Advanced countries had already entered the stage of nature 'highly industrialized society' Reforms on complete transportation systems by containers connected with many different countries greatly influenced the roles of the ports. Huge spaces for sorting out imported products and materials were reguired. And because of that, port facilities existing at that time became functionally outdated and they even became useless Furthermore, the decline of heavy industries such as steel manufaturing and ship building prompted the necessity of redevelopment of seaside areas.<br/> The objective of the present paper is to discuss 'Problems of ports in relation to the natural environment, ' Problems of Historic Scenery in Redevelopment of Ports, and future of ' Ports and Problems of Citizens' Lives' from the perspectives discussed in the first paragraph.
DNA Length Dependent Photocurrent of Diketopyrrolopyrrole Aggregates Constructed with DNA
Nakamura, Mitsunobu,Tsuto, Koji,Takada, Tadao,Yamana, Kazushige Korean Society of Photoscience 2014 Rapid communication in photoscience Vol.3 No.4
Bis(2-thienyl)-diketopyrrolopyrrole having two $Zn^{II}$-cylcens (DPPCy) was synthesized. DPP-aggregates were constructed by self-organization of DPPCy and $dT_n$-DNAs. In the presence of L-ascorbic acid as an electron sacrifice reagent, the DPP aggregates immobilized on a gold electrode exhibit good anodic photocurrent responses as well as cathodic photocurrent responses in the presence of methyl viologen. The anodic photocurrent responses depend on the DNA lengths because of the formation of uniform DPP-aggregates corresponding to the DNA lengths. The present results show that photocurrent responses of the DPP-aggregates can be controlled by DNA lengths and electron sacrifice reagents.
Preparation of BaTiO<sub>3</sub> Thick Film by an Interfacial Polymerization Method
Iwasaki, Mitsunobu,Park, Won-Kyu Materials Research Society of Korea 2007 한국재료학회지 Vol.17 No.10
[ $BaTiO_3$ ] thick film by an interfacial polymerization method was prepared at the liquid/liquid interface between benzyl alcohol saturated solution with the basic catalyst [diethyl amine ($NHEt_2$) or triethylamine ($NEt_3$)], and the water dissolved with $TiO_2$ and $Ba(CH_3COO)_2$. The film thickness increased gradually with an increase in diethyl amine($NHEt_2$) or triethylamine($NEt_3$) volume and the reaction time. The homogeneity of $BaTiO_3$ thick film after sintered at $600^{\circ}C$ was confirmed by EPMA analysis, which showed that both of Ba and Ti element were homogeneously distributed on the surface as well as in the perpendicular direction of the film. The thickness of $BaTiO_3$ film obtained by this process was $8.75\;{\mu}m$.