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RISS 인기검색어
- 검색키워드
- 저자 : J. Noirot (검색결과 4 건)
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Assef, R. J.,Stern, D.,Noirot, G.,Jun, H. D.,Cutri, R. M.,Eisenhardt, P. R. M. American Astronomical Society 2018 The Astrophysical journal, Supplement series Vol.234 No.2
<P>We present two large catalogs of active galactic nucleus (AGN) candidates identified across 30,093 deg(2) of extragalactic sky from the Wide-field Infrared Survey Explorer's AllWISE Data Release. Both catalogs are selected purely using the Wide-field Infrared Survey Explorer (WISE) W1 and W2 bands. The R90 catalog consists of 4,543,530 AGN candidates with 90% reliability, while the C75 catalog consists of 20,907,127 AGN candidates with 75% completeness. These reliability and completeness figures were determined from a detailed analysis of UV- to near-IR spectral energy distributions of similar to 10(5) sources in the 9 deg(2) Bootes field. The AGN selection criteria are based on those of Assef et al. (2013) recalibrated to the AllWISE data release. We provide a detailed discussion of potential artifacts and excise portions of the sky close to the Galactic Center, Galactic Plane, nearby galaxies, and other expected contaminating sources. These catalogs are expected to enable a broad range of science, and we present a few illustrative cases. From the R90 sample, we identify 45 highly variable AGNs lacking radio counterparts in the FIRST survey. One of these sources, WISEA J142846.71+172353.1, is a changing-look quasar at z = 0.104, which has changed from having broad Ha to being a narrow-lined AGN. We characterize our catalogs by comparing them to large, wide-area AGN catalogs in the literature. We identify four ROSAT X-ray sources that are each matched to three WISE-selected AGNs in the R90 sample within 30.. Spectroscopy reveals that one of these systems, 2RXS J150158.6+691029, consists of a triplet of quasars at z = 1.133 +/- 0.004, suggestive of a rich group or forming galaxy cluster.</P>
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HIGH BURNUP CHANGES IN UO₂ FUELS IRRADIATED UP TO 83 GWD/T IN M5® CLADDINGS
J. NOIROT,I. AUBRUN,L. DESGRANGES,K. HANIFI,J. LAMONTAGNE,B. PASQUET,C. VALOT,P. BLANPAIN,H. COGNON 한국원자력학회 2009 Nuclear Engineering and Technology Vol.41 No.2
Since the 90’s, EDF and AREVA-NP have irradiated, up to very high burnups, lead assemblies housing M5® cladded fuels. Post-irradiation examination of high burnup UO₂ pellets show an increase in the fission-gas release rate, an increase in fuel swelling, and formation of fission-gas bubbles throughout the pellets. Xenon abundances were quantified, and phenomena leading to this bubble formation were identified. All examinations provided valuable data on the complex state of the fuel during irradiation. They show the good behavior of these fuels, exhibiting various microstructures at very high burnups, none of which is likely to lead to problems during irradiation
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HIGH BURNUP CHANGES IN UO<sub>2</sub> FUELS IRRADIATED UP TO 83 GWD/T IN M5<sup>(R)</sup> CLADDINGS
Noirot, J.,Aubrun, I.,Desgranges, L.,Hanifi, K.,Lamontagne, J.,Pasquet, B.,Valot, C.,Blanpain, P.,Cognon, H. Korean Nuclear Society 2009 Nuclear Engineering and Technology Vol.41 No.2
Since the 90's, EDF and AREVA-NP have irradiated, up to very high burnups, lead assemblies housing $M5^{(R)}$ cladded fuels. Post-irradiation examination of high burnup $UO_2$ pellets show an increase in the fission-gas release rate, an increase in fuel swelling, and formation of fission-gas bubbles throughout the pellets. Xenon abundances were quantified, and phenomena leading to this bubble formation were identified. All examinations provided valuable data on the complex state of the fuel during irradiation. They show the good behavior of these fuels, exhibiting various microstructures at very high burnups, none of which is likely to lead to problems during irradiation.
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J. Noirot,I. Zacharie-Aubrun,T. Blay 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.2
Focused ion beamescanning electron microscope and electron backscattered diffraction examinationswere conducted in the center of a 73 GWd/tU UO2 fuel. They showed the formation of subdomains withinthe initial grains. The local crystal orientations in these domains were close to that of the original grain. Most of the fission gas bubbles were located on the boundaries. Their shapes were far from spherical andfar from lenticular. No interlinked bubble network was found. These observations shed light on previousunexplained observations. They plead for a revision of the classical description of fission gas releasemechanisms for the center of high burn-up UO2. Yet, complementary detailed observations are needed tobetter understand the mechanisms involved
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