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603 results on '"Dubois, J. M."'

2. Scratch-induced surface microstructures on the deformed surface of Al-Cu-Fe icosahedral quasicrystals

Author

Wu, J. S, Brien, Valerie, Brunet, P., Dong, C., and Dubois, J. -M

Subjects
Condensed Matter - Materials Science
Abstract

Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) investigations of sintered Al-Cu-Fe icosahedral quasicrystal (IQC) have been carried out to understand the origin of some ductility previously noticed within tracks produced by standard tribological scratch tests. Transformation of the icosahedral phase to a modulated structure is shown and a transformation of the IQC to a bcc phase has been found beneath the tracks. Twins and dislocations have also been observed.

Published
2020
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4. The camera of the fifth H.E.S.S. telescope. Part I: System description

Author

Bolmont, J., Corona, P., Gauron, P., Ghislain, P., Goffin, C., Riveros, L. Guevara, Huppert, J. -F., Martineau-Huynh, O., Nayman, P., Parraud, J. -M., Tavernet, J. -P., Toussenel, F., Vincent, D., Vincent, P., Bertoli, W., Espigat, P., Punch, M., Besin, D., Delagnes, E., Glicenstein, J. -F., Moudden, Y., Venault, P., Zaghia, H., Brunetti, L., David, P. -Y., Dubois, J-M., Fiasson, A., Geffroy, N., Monteiro, I. Gomes, Journet, L., Krayzel, F., Lamanna, G., Flour, T. Le, Lees, S., Lieunard, B., Maurin, G., Mugnier, P., Panazol, J. -L., Prast, J., Chounet, L. -M., Degrange, B., Edy, E., Fontaine, G., Giebels, B., Hormigos, S., Khélifi, B., Manigot, P., Maritaz, P., de Naurois, M., Compin, M., Feinstein, F., Fernandez, D., Mehault, J., Rivoire, S., Royer, S., Sanguillon, M., and Vasileiadis, G.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

In July 2012, as the four ground-based gamma-ray telescopes of the H.E.S.S. (High Energy Stereoscopic System) array reached their tenth year of operation in Khomas Highlands, Namibia, a fifth telescope took its first data as part of the system. This new Cherenkov detector, comprising a 614.5 m^2 reflector with a highly pixelized camera in its focal plane, improves the sensitivity of the current array by a factor two and extends its energy domain down to a few tens of GeV. The present part I of the paper gives a detailed description of the fifth H.E.S.S. telescope's camera, presenting the details of both the hardware and the software, emphasizing the main improvements as compared to previous H.E.S.S. camera technology., Comment: 16 pages, 13 figures, accepted for publication in NIM A

Published
2013
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5. Improved sensitivity of H.E.S.S.-II through the fifth telescope focus system

Author

Krayzel, F., Maurin, G., Brunetti, L., Dubois, J. -M., Fiasson, A., Journet, L., Lamanna, G., Leflour, T., Lieunard, B., Monteiro, I., and Rosier-Lees, S.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The Imaging Atmospheric Cherenkov Telescope (IACT) works by imaging the very short flash of Cherenkov radiation generated by the cascade of relativistic charged particles produced when a TeV gamma ray strikes the atmosphere. This energetic air shower is initiated at an altitude of 10-30 km depending on the energy and the arrival direction of the primary gamma ray. Whether the best image of the shower is obtained by focusing the telescope at infinity and measuring the Cherenkov photon angles or focusing on the central region of the shower is a not obvious question. This is particularly true for large size IACT for which the depth of the field is much smaller. We address this issue in particular with the fifth telescope (CT5) of the High Energy Stereoscopic System (H.E.S.S.); a 28 m dish large size telescope recently entered in operation and sensitive to an energy threshold of tens of GeVs. CT5 is equipped with a focus system, its working principle and the expected effect of focusing depth on the telescope sensitivity at low energies (50-200 GeV) is discussed., Comment: In Proceedings of the 33rd International Cosmic Ray Conference (ICRC2013), Rio de Janeiro (Brazil)

Published
2013

7. The camera of the fifth H.E.S.S. telescope. Part I: System description

Author

Bolmont, J., Corona, P., Gauron, P., Ghislain, P., Goffin, C., Guevara Riveros, L., Huppert, J.-F., Martineau-Huynh, O., Nayman, P., Parraud, J.-M., Tavernet, J.-P., Toussenel, F., Vincent, D., Vincent, P., Bertoli, W., Espigat, P., Punch, M., Besin, D., Delagnes, E., Glicenstein, J.-F., Moudden, Y., Venault, P., Zaghia, H., Brunetti, L., David, P.-Y., Dubois, J.-M., Fiasson, A., Geffroy, N., Gomes Monteiro, I., Journet, L., Krayzel, F., Lamanna, G., Le Flour, T., Lees, S., Lieunard, B., Maurin, G., Mugnier, P., Panazol, J-L., Prast, J., Chounet, L.-M., Degrange, B., Edy, E., Fontaine, G., Giebels, B., Hormigos, S., Khélifi, B., Manigot, P., Maritaz, P., de Naurois, M., Compin, M., Feinstein, F., Fernandez, D., Mehault, J., Rivoire, S., Royer, S., Sanguillon, M., and Vasileiadis, G.

Published
2014
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11. Index to the Reports of the University of California Archaeological Survey, Number 1-30

Author

Antevs, Ernst, Avery, B P, Baumhoff, Martin A, Beardsley, Richard K, Bennyhoff, J A, Dubois, J. M. F, Bowen, Alley, Brainerd, George W, Cessac, Leon de, Cook, Sherburne F, Ehleben, E T, Ellis, H Holmes, Elsasser, Albert B, Gifford, E W, Goldschmidt, Walter, Gonsalves, William C, Greengo, Robert E, Grosscup, Gordon L, Hamy, E, Harner, Michael J, Harradine, Frank, Heizer, Nancy E, Heizer, Robert F, Hrdlicka, Ales, Kroeber, Alfred L, Lathrap, Donald, Lee, S L, Loud, LLowellyn L, McCown, T D, Meighan, Clement W, Mills, John E, Riddell, F A, Riddell, Harry S, Robinson, Eugene, Sample, L L, Smith, C E, Squier, Robert J, Storie, R E, Tarr, W A, Taylor, Edith S, Treganza, Adan E, Wallace, William J, Weymouth, W D, and Willis, Bailey

Published
1955

18. [11C]PBR28 MR–PET imaging reveals lower regional brain expression of translocator protein (TSPO) in young adult males with autism spectrum disorder

Author

Zürcher, N. R., primary, Loggia, M. L., additional, Mullett, J. E., additional, Tseng, C., additional, Bhanot, A., additional, Richey, L., additional, Hightower, B. G., additional, Wu, C., additional, Parmar, A. J., additional, Butterfield, R. I., additional, Dubois, J. M., additional, Chonde, D. B., additional, Izquierdo-Garcia, D., additional, Wey, H. Y., additional, Catana, C., additional, Hadjikhani, N., additional, McDougle, C. J., additional, and Hooker, J. M., additional

Published
2020
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