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- 저자 : Hideaki Matsuura (검색결과 3 건)
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Toshihisa Kamiji,Hideaki Matsuura 국립중앙과학관 2022 Journal of Asia-Pacific Biodiversity Vol.15 No.2
An illustrated key and annotated list for the subfamilies Phytalmiinae and Tephritinae (Diptera: Tephritidae) detected in plant quarantine may be useful for rapid identification by quarantine officials. In this study, specimens of the flies detected in Japanese quarantine, which have been stored at the plant protection station, Ministry of Agriculture, Forestry and Fisheries of Japan, were identified. The results showed that one species of Phytalmiinae and 17 species of Tephritinae were newly recorded in quarantined plants: Phytalmiinae, Themarictera flaveolata; Tephritinae, Actinoptera sp., Campiglossa sororcula, Campiglossa sp., Euaresta bellula, Euaresta stigmatica, Eurosta solidaginis solidaginis, Metasphenisca nigricans, Neotephritis finalis, Spathulina arcucincta, Spathulina hessii, Terellia sp. near longicauda, Terellia vectensis, Trupanea californica, Trupanea jonesi, Trupanea nigricornis, Trupanea radifera, and Trupanea signata. Here, an illustrated key containing fly species detected in Japanese quarantine, which were recorded in this and previous studies, is presented. The key includes simple features and specimen color images. An annotated list of the species detected in quarantine is also shown. The list includes related information such as diagnosis with simple features and specimen color images, distribution, and host plants. The key and list can contribute to the rapid identification of fruit flies detected in quarantine.
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Calculation of Low-Energy Reactor Neutrino Spectra for Reactor Neutrino Experiments
Riyana, Eka Sapta,Suda, Shoya,Ishibashi, Kenji,Matsuura, Hideaki,Katakura, Jun-ichi The Korean Association for Radiation Protection 2016 방사선방어학회지 Vol.41 No.2
Background: Nuclear reactors produce a great number of antielectron neutrinos mainly from beta-decay chains of fission products. Such neutrinos have energies mostly in MeV range. We are interested in neutrinos in a region of keV, since they may take part in special weak interactions. We calculate reactor antineutrino spectra especially in the low energy region. In this work we present neutrino spectrum from a typical pressurized water reactor (PWR) reactor core. Materials and Methods: To calculate neutrino spectra, we need information about all generated nuclides that emit neutrinos. They are mainly fission fragments, reaction products and trans-uranium nuclides that undergo negative beta decay. Information in relation to trans-uranium nuclide compositions and its evolution in time (burn-up process) were provided by a reactor code MVP-BURN. We used typical PWR parameter input for MVP-BURN code and assumed the reactor to be operated continuously for 1 year (12 months) in a steady thermal power (3.4 GWth). The PWR has three fuel compositions of 2.0, 3.5 and 4.1 wt% $^{235}U$ contents. For preliminary calculation we adopted a standard burn-up chain model provided by MVP-BURN. The chain model treated 21 heavy nuclides and 50 fission products. The MVB-BURN code utilized JENDL 3.3 as nuclear data library. Results and Discussion: We confirm that the antielectron neutrino flux in the low energy region increases with burn-up of nuclear fuel. The antielectron-neutrino spectrum in low energy region is influenced by beta emitter nuclides with low Q value in beta decay (e.g. $^{241}Pu$) which is influenced by burp-up level: Low energy antielectron-neutrino spectra or emission rates increase when beta emitters with low Q value in beta decay accumulate Conclusion: Our result shows the flux of low energy reactor neutrinos increases with burn-up of nuclear fuel.
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