16 Result(s)
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T Yokoyama
Characterization and Evaluation of Materials
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Article
Preparation and electrical properties of sintered bodies composed of CrXMn1.5Co(1.0-X)Ni0.5O4 (0 ≦ X ≦ 0.42) with a cubic spinel structure
Preparation and electrical properties of sintered bodies consisting of monophase cubic spinel oxides, CrXMn1.5Co(1.0-X)Ni0.5O4 (0 ≦ X ≦ 0.42), were investigated. Specimens with compositions within X = 0.42 were p...
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Article
Preparation and electrical properties of sintered bodies composed of Mn(2.25-X)FeXNi0.75O4 (0≦X≦2.25) with cubic spinel structure
Preparation and electrical properties of sintered bodies consisting of monophase cubic spinel oxides, Mn(2.25-X)FeXNi0.75O4 (0≦X≦2.25), were investigated. Sintered bodies with monophase cubic spinel structure wer...
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Article
Preparation and electrical properties of sintered oxide composed of MnFeNiO4 with a cubic spinel structure
The preparation and electrical properties of a sintered body consisting of cubic spinel oxide MnFeNiO4 were investigated. A sintered body with cubic spinel and NaCl-type oxides prepared at 1400 °C in Ar could be ...
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Article
Theory of Josephson Effect in Sr2RuO4/Diffusive Ferromagnet/Sr2RuO4 Junctions
We study Josephson effect in Sr2RuO4/insulator/diffusive ferromagnet (DF)/insulator/Sr2RuO4 junctions, solving the Usadel equation under a new boundary condition for DF/Sr2RuO4 interface. Josephson current is ca...
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Article
Dependence of Josephson Current on Orientational Angle in Diffusive p-Wave Superconductor Junctions
We calculate Josephson current in p-wave superconductor (P)/diffusive normal metal (DN)/insulator/diffusive normal metal/p-wave superconductor junctions, using quasi-classical Green’s function theory. We study t...
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Article
Preparation and electrical properties of sintered oxides composed of Mn1.5Co(0.25+X)Ni(1.25-X)O4 ( \(0 \leqq X \leqq 0.75\) ) with a cubic spinel structure
Monophase cubic spinel-type oxides of Mn1.5Co(0.25+X)Ni(1.25-X)O4 ( \(0 \leqq X \leqq 1\) ) were prepared through the ...
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Article
Electric double layer capacitance of multi-walled carbon nanotubes and B-do** effect
The double layer capacitance properties of multi-walled carbon nanotubes (MWCNTs) prepared by CVD were investigated using propylene carbonate electrolytes. The original MWCNTsare typically entangled tubes with...
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Article
Impact tensile properties of 6061 aluminium alloy to SUS 304 stainless steel friction-welded butt joints
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Article
Effect of TiO2 addition on oxidation behavior of sintered bodies composed of Si3N4-Y2O3-Al2O3-AlN
The effect of TiO2 content on the oxidation of sintered bodies from the conventional Si3N4-Y2O3-Al2O3-AlN system was investigated. Sintered specimens composed of Si3N4, Y2O3, Al2O3, and AlN, with a ratio of 100 :...
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Article
Formation region of monophase with cubic spinel-type oxides in Mn–Co–Ni ternary system
This study was performed to find the composition area of cubic spinel-type monophase oxides composed of the Mn–Co–Ni ternary system. Starting materials were prepared by mixing Mn, Co, and Ni nitrates then evap...
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Article
Flow analysis preconcentration of Mg and Zn using emulsions for flame atomic absorption spectrometry
A preconcentration method combining Water/ Oil/Water (W/O/W) emulsions with flow injection manifolds has been developed for determinations of Mg and Zn. The system consists of a mixing coil filled with Span 8...
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Article
Preparation and electrical properties of monophase cubic spinel, Mn1.5Co0.95Ni0.55O4, derived from rock salt type oxide
The purpose of this study was to prepare a sintered body consisting of monophase cubic spinel type oxide, Mn1.5Co0.95Ni0.55O4, and to evaluate its electrical properties. It was found that cooling from 1400 to 100...
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Article
Thermoelectric Properties of Boron and Boron Phosphide Film
This paper describes the thermoelectric properties of amorphous or polycrystalline boron and boron phosphide films prepared using chemical vapor deposition and molecular beam deposition. The temperature depend...
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Article
Preparation of Mn-Co-Ni mono-phase spinel oxide by oxidation of rock salt-type oxide
Preparation of a mono-phase spinel from a ternary system Mn-Co-Ni oxide with a molar ratio of 3.0∶1.9∶1.1 was investigated. It was found that the oxidation profile of a rock salt-type oxide, which was formed a...
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Article
A novel impact three-point bend test method for determining dynamic fracture-initiation toughness
A novel impact three-point bend test method has been developed for determining the dynamic fracture-initiation toughness,K Id, over the range of loading rates
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Chapter
Behaviour of Materials at High Strain Rates and Cryogenic Temperature
An experimental technique has been developed for investigating behaviour of materials at high strain rates and cryogenic temperature using a split Hopkinson bar system and a liquid helium cryostat. Yield stres...
