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Papers by Akiko Kobayashi

Journal of Solid State Chemistry France, May 1, 2009

We have grown group III nitride films on Al 2O 3 (0 0 0 1), 6H-SiC (0 0 0 1), and ZnO ( 0 0 0 1¯)... more We have grown group III nitride films on Al 2O 3 (0 0 0 1), 6H-SiC (0 0 0 1), and ZnO ( 0 0 0 1¯) substrates by pulsed electron beam deposition (PED) for the first time and investigated their characteristics. We found that c-plane AlN and GaN grow epitaxially on these substrates. It has been revealed that the growth of GaN on atomically flat 6H-SiC substrates starts with the three-dimensional mode and eventually changes into the two-dimensional mode. The GaN films exhibited strong near-band-edge emission in their room temperature photoluminescence spectra. We also found that the use of PED allows us to reduce the epitaxial growth temperature for GaN down to 200 °C.

Japanese Journal of Applied Physics, 2000

Transactions of Jwri, Jun 1, 1989

This paper proposes an image retrieval system, which searches a database for images similar to a ... more This paper proposes an image retrieval system, which searches a database for images similar to a target imagined by a user. The system uses image features, rather than keywords, and retrieves images by reducing a multidimensional feature space generated by the image feature vectors. The system presents the user sample images, with a suitable feature vector value, and requires the user's interaction to obtain information regarding application of specific images. The information is then used to appropriately reduce the feature space. This process continues, until the target region is reduced to a suitable volume. Since this method requires neither a real target image nor keywords in retrieving, it is quite simple and practical. Experimental results show the advantage and efficiency of the proposed system.

Agricultural and Biological Chemistry, Sep 9, 2014

Materials Science and Engineering B Advanced Functional Solid State Materials, Feb 1, 2007

Polycrystalline silicon carbide films have been prepared by the gas tunnel type plasma spraying m... more Polycrystalline silicon carbide films have been prepared by the gas tunnel type plasma spraying method (GTPS). The effect of gun current on microstructure and mechanical properties was investigated. Scanning electron microscopy, X-ray diffraction, energy dispersive spectroscopy, nanoindentation and abrasive wear were used to characterize the structure, thickness, composition and the mechanical properties of SiC films. Microstructural studies revealed that the formation of cubic silicon carbide (C-SiC) at higher gun currents from 120 to 140 A. The SiC films have good-adhesion, dense, smooth and compact morphology. Hardness of SiC films strongly improved from 23 to 31.5 GPa as the gun current increased from 0 to 140 A. SiC films formed at higher gun current exhibits better wear resistance than that deposited at low gun current, mainly due to SiC films become more hard and more dense. The crystalline cubic silicon carbide films with good morphology and mechanical properties have been obtained from the GTPS method, which makes it a suitable material for high-temperature thermoelectric and mechanical applications.

J Agr Food Chem, 1989

Eight geometrical isomers of 5,8,11-tetradecatrien-2-one were selectively synthesized. The values... more Eight geometrical isomers of 5,8,11-tetradecatrien-2-one were selectively synthesized. The values on the IH and 13C NMR spectra were unambiguously assigned on the basis of the synthetically established stereostructures. By comparing their IR and NMR spectra, the naturally occurring isomers isolated from an aroma concentrate of cooked small shrimps were confirmed to be all-2 and 5E,8Z,llZ isomers. A sensory evaluation of the synthesized isomers suggested that the two identical with the natural product had the most acceptable seafood aroma, like that of cooked shrimp and crab, and that these compounds seemed to be important to the flavor of some cooked seafood products.

Archive Proceedings of the Institution of Mechanical Engineers Conference Proceedings 1964 1970 Various Titles Labelled Volumes a to S, 1963

Food Science and Technology International Tokyo, 1996

Biosci Biotechnol Biochem, 1992

Journal of Solid State Chemistry France, May 1, 2009

We have grown group III nitride films on Al 2O 3 (0 0 0 1), 6H-SiC (0 0 0 1), and ZnO ( 0 0 0 1¯)... more We have grown group III nitride films on Al 2O 3 (0 0 0 1), 6H-SiC (0 0 0 1), and ZnO ( 0 0 0 1¯) substrates by pulsed electron beam deposition (PED) for the first time and investigated their characteristics. We found that c-plane AlN and GaN grow epitaxially on these substrates. It has been revealed that the growth of GaN on atomically flat 6H-SiC substrates starts with the three-dimensional mode and eventually changes into the two-dimensional mode. The GaN films exhibited strong near-band-edge emission in their room temperature photoluminescence spectra. We also found that the use of PED allows us to reduce the epitaxial growth temperature for GaN down to 200 °C.

Japanese Journal of Applied Physics, 2000

Transactions of Jwri, Jun 1, 1989

This paper proposes an image retrieval system, which searches a database for images similar to a ... more This paper proposes an image retrieval system, which searches a database for images similar to a target imagined by a user. The system uses image features, rather than keywords, and retrieves images by reducing a multidimensional feature space generated by the image feature vectors. The system presents the user sample images, with a suitable feature vector value, and requires the user's interaction to obtain information regarding application of specific images. The information is then used to appropriately reduce the feature space. This process continues, until the target region is reduced to a suitable volume. Since this method requires neither a real target image nor keywords in retrieving, it is quite simple and practical. Experimental results show the advantage and efficiency of the proposed system.

Agricultural and Biological Chemistry, Sep 9, 2014

Materials Science and Engineering B Advanced Functional Solid State Materials, Feb 1, 2007

Polycrystalline silicon carbide films have been prepared by the gas tunnel type plasma spraying m... more Polycrystalline silicon carbide films have been prepared by the gas tunnel type plasma spraying method (GTPS). The effect of gun current on microstructure and mechanical properties was investigated. Scanning electron microscopy, X-ray diffraction, energy dispersive spectroscopy, nanoindentation and abrasive wear were used to characterize the structure, thickness, composition and the mechanical properties of SiC films. Microstructural studies revealed that the formation of cubic silicon carbide (C-SiC) at higher gun currents from 120 to 140 A. The SiC films have good-adhesion, dense, smooth and compact morphology. Hardness of SiC films strongly improved from 23 to 31.5 GPa as the gun current increased from 0 to 140 A. SiC films formed at higher gun current exhibits better wear resistance than that deposited at low gun current, mainly due to SiC films become more hard and more dense. The crystalline cubic silicon carbide films with good morphology and mechanical properties have been obtained from the GTPS method, which makes it a suitable material for high-temperature thermoelectric and mechanical applications.

J Agr Food Chem, 1989

Eight geometrical isomers of 5,8,11-tetradecatrien-2-one were selectively synthesized. The values... more Eight geometrical isomers of 5,8,11-tetradecatrien-2-one were selectively synthesized. The values on the IH and 13C NMR spectra were unambiguously assigned on the basis of the synthetically established stereostructures. By comparing their IR and NMR spectra, the naturally occurring isomers isolated from an aroma concentrate of cooked small shrimps were confirmed to be all-2 and 5E,8Z,llZ isomers. A sensory evaluation of the synthesized isomers suggested that the two identical with the natural product had the most acceptable seafood aroma, like that of cooked shrimp and crab, and that these compounds seemed to be important to the flavor of some cooked seafood products.

Archive Proceedings of the Institution of Mechanical Engineers Conference Proceedings 1964 1970 Various Titles Labelled Volumes a to S, 1963

Food Science and Technology International Tokyo, 1996

Biosci Biotechnol Biochem, 1992