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257 results on '"Watamori A"'

255. High-Energy Ion Beam Analysis of YBa2Cu3OxThin Films

Author

Watamori, Michio, Oura, Kenjiro, Shoji, Fumiya, Yotsuya, Tsutomu, Ogawa, Soichi, and Hanawa, Teruo

Abstract

The composition and crystalline structure of high-Tcsuperconducting YBa2Cu3Oxthin films formed on MgO(100) and Si(100) substrates have been investigated by Rutherford backscattering and channeling techniques. Y, Ba, Cu contents have been analyzed by employing a high-energy (over 4.5 MeV) 4He ions and large scattering angle (near 170°) condition, where Y, Ba and Cu peaks are clearly separated from each other. Oxygen concentration has been obtained through the use of low primary energy (below 2.5 MeV) and small scattering angle (below 150°) conditions, where the O peak is separated from the background. The crystalline quality of the films has also been investigated by ion channeling techniques.

Published
1989
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256. Methodology for Accurate Oxygen Distribution Analysis and Its Application to YBa2Cu3OxThin Films Using 16O(?, ?)16O3.045 MeV Resonance Reaction

Author

Watamori, Michio, Fumiya Shoji, Fumiya Shoji, and Kenjiro Oura, Kenjiro Oura

Abstract

The enhancement factor of oxygen of 16O(?, ?)16O resonance for a Rutherford backscattering cross section has been investigated using SiO2films of various thicknesses. A new procedure to accurately extract the resonant oxygen height from a raw spectrum has been proposed. With this procedure, the dependence between the film thicknesses and resonant signals has been investigated, and was found to agree well with a computer simulation within experimental error. Using the enhancement factor, the depth dependence of oxygen concentration in the YBa2Cu3Ox/MgO systems has been estimated accurately. Estimations of the accuracy of elastic backscattering analysis are also given.

Published
1994
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257. Influenza A Virus Infection in Domestic Ferrets.

Author

Kuroda Y, Okada A, Shimoda H, Miwa Y, Watamori A, Ishida H, Murakami S, Takada A, Horimoto T, and Maeda K

Subjects
Animals, Antibodies, Viral, Ferrets metabolism, Hemagglutinin Glycoproteins, Influenza Virus genetics, Hemagglutinins, Humans, Influenza A virus genetics, Influenza, Human, Orthomyxoviridae Infections veterinary
Abstract

Ferrets are animals that are known to be susceptible to influenza A virus (IAV) infection. To evaluate the risk of IAV transmission from diseased ferrets to humans, a survey was performed to detect specific antibodies against the H1, H3, H5, and H7 subtypes of IAV. Using enzyme-linked immunosorbent assay for hemagglutinin proteins, we found a high positive rate for the H1 (24.1%) and H3 (5.2%) subtypes. The results were confirmed by a virus neutralization test for representative antibody-positive serum samples. We also detected hemagglutinin and neuraminidase genes in two ferrets showing acute respiratory disease and whose owner was diagnosed with IAV infection; a human H1N1pdm virus was isolated from one of these ferrets. Our findings suggest that attention should be paid to IAV infection from humans to ferrets and vice versa.

Published
2022
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