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622 results on '"Samain, E."'

161. Time transfer by laser link T2L2 first results

Author

Samain, E., primary, Exertier, P., additional, Guillemot, Ph., additional, Pierron, F., additional, Albanese, D., additional, Paris, J., additional, Torre, J.-M., additional, Petitbon, I., additional, and Leon, S., additional

Published
2009
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168. Odyssey: a solar system mission

Author

Christophe, B., primary, Andersen, P. H., additional, Anderson, J. D., additional, Asmar, S., additional, Bério, Ph., additional, Bertolami, O., additional, Bingham, R., additional, Bondu, F., additional, Bouyer, Ph., additional, Bremer, S., additional, Courty, J.-M., additional, Dittus, H., additional, Foulon, B., additional, Gil, P., additional, Johann, U., additional, Jordan, J. F., additional, Kent, B., additional, Lämmerzahl, C., additional, Lévy, A., additional, Métris, G., additional, Olsen, O., additional, Pàramos, J., additional, Prestage, J. D., additional, Progrebenko, S. V., additional, Rasel, E., additional, Rathke, A., additional, Reynaud, S., additional, Rievers, B., additional, Samain, E., additional, Sumner, T. J., additional, Theil, S., additional, Touboul, P., additional, Turyshev, S., additional, Vrancken, P., additional, Wolf, P., additional, and Yu, N., additional

Published
2008
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171. Isolation of a thermophilic bacterium producing high levels of xylanase

Author

Samain, E., Touzel, J.P., Brodel, B., Debeire, Philippe, ProdInra, Migration, J. Visser, Laboratoire de Génie des Procédés et Technologie Alimentaires (LGPTA), and Institut National de la Recherche Agronomique (INRA)

Subjects
[SDV] Life Sciences [q-bio], [SDV]Life Sciences [q-bio], CULTURE DE BACTERIES
Published
1992

186. COLD ATOM CLOCKS IN SPACE: PHARAO and ACES

Author

LAURENT, P., primary, ABGRALL, M., additional, CLAIRON, A., additional, LEMONDE, P., additional, SANTARELLI, G., additional, UHRICH, P., additional, DIMARCQ, N., additional, BERNER, L. G., additional, BUSCA, G., additional, JORNOD, A., additional, THOMANN, P., additional, SAMAIN, E., additional, WOLF, P., additional, GONZALEZ, F., additional, GUILLEMOT, Ph., additional, LEON, S., additional, NOUEL, F., additional, SIRMAIN, Ch., additional, FELTHAM, S., additional, and SALOMON, C., additional

Published
2002
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188. Time transfer by Laser Link: The T2L2 experiment onboard the Jason-2 space vehicle.

Author

Guillemot, Ph., Petitbon, I., Gasc, K., Samain, E., Albanese, D., Dalla, R., Furia, M., Paris, J., Mangin, J-F., Torre, J-M., Vrancken, P., and Weick, J.

Abstract

The new generation of optical time transfer (T2L2: Time Transfer by Laser Link [1]) under development at OCA and CNES shall allow the synchronisation of remote ultra stable clocks and the determination of their performances over intercontinental distances. The principle is based on the propagation of light pulses between clocks to synchronize. T2L2 is the follow-on mission to LASSO (LAser Synchronisation from Stationary Orbit) [2] with performances improved by two orders of magnitude. We have now the opportunity to put a T2L2 payload on the Jason-2 space vehicle, which will be launched in mid 2008 for a 5 years long mission. A preliminary performance budget and a ground experiment conducted by the OCA permit to envision a performance improvement of at least one order of magnitude as compared to the best time transfer techniques available. Expected performances are in the 100ps range for accuracy, with an ultimate stability better than 1ps over 1000s (one pass) and than 10ps over one day. Time transfer performances in a common view mode are driven by the noise of both the ground and the onboard timers whereas the performances in a non-common view configuration are limited by the onboard clock (DORIS USO). The main objectives of the T2L2 mission are technological (In-orbit functional and performance validation), scientific (Time & Frequency metrology and Fundamental physics tests) with also a contribution to the Jason-2 core mission (Evaluation of the behaviours, versus radiations, of the DORIS USO). [ABSTRACT FROM PUBLISHER]

Published
2006

189. The T2L2 ground experiment time transfer in the picosecond range over a few kilometres.

Author

Samain, E., Albanese, D., Baumont, F., Cuot, E., Dalla, R., Fridelance, P., Gasc, K., Guillemot, Ph., Leon, S., Mangin, JF., Oneto, JL., Paris, J., Petitbon, I., Ravet, M., Torre, JM., Vrancken, P., and Weick, J.

Abstract

The new generation of optical time transfer (T2L2: Time Transfer by Laser Link [1]), under development at CNES (Centre National d'Etudes Spatiales) and OCA (Observatoire de la Côte d'Azur), shall allow the synchronisation of remote ultra-stable clocks and the determination of their performances over intercontinental distances. The principle is based on the propagation of light pulses between clocks to be synchronized. T2L2 is the follow-on mission to LASSO (LAser Synchronisation from Stationary Orbit) [2, 3] with performances in the picosecond range for both stability and accuracy. T2L2 is based on a space instrumentation that includes an event timer linked to the space clock, and some laser ranging stations linked to ground clocks. In order to validate the concept and to evaluate precisely the error budget, we realized two global experiments with some prototypes of both the ground and space instrumentations. These prototypes are based on electronic event timers and photo-detection devices that we developed in the framework of T2L2 project. In 1998, we performed a first ground experiment involving two OCA's laser stations and a first prototype of the space instrumentation 2.5 km apart. Results were promising but with some limitations due to the use of a bad quartz oscillator as the space clock. A second experiment was decided in 2004 with the OCA Lunar laser ranging station and a more finalized space segment installed closed to the station. The experiment was based on a free space propagation across 10 kilometres thanks to a large corner cube placed 2.5 km away. In order to measure the noise of the link without the noise of the clocks, a third event timer was able to measure the direct phase between signal clocks of both the space and ground prototypes. [ABSTRACT FROM PUBLISHER]

Published
2006

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