Zobrazeno 1 - 10
of 39
pro vyhledávání: '"E F Arias"'
Autor:
Tobias Nilsson, R. Gaume, Axel Nothnagel, E. Skurikhina, Zinovy Malkin, Patrick Charlot, S. Bolotin, David Gordon, David Mayer, A. de Witt, Johannes Böhm, Sébastien Lambert, O. Titov, Alan L. Fey, Christopher S. Jacobs, E. F. Arias, Robert Heinkelmann, Dan MacMillan, Chopo Ma, Geraldine Bourda
Publikováno v:
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2020, 644, pp.A159. ⟨10.1051/0004-6361/202038368⟩
Astronomy and Astrophysics
Astronomy and Astrophysics-A&A, EDP Sciences, 2020, 644, pp.A159. ⟨10.1051/0004-6361/202038368⟩
Astronomy and Astrophysics
A new realization of the International Celestial Reference Frame (ICRF) is presented based on the work achieved by a working group of the International Astronomical Union (IAU) mandated for this purpose. This new realization, referred to as ICRF3, is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::821c32215725e1896767e2ac71f1c124
http://hdl.handle.net/20.500.12278/95208
http://hdl.handle.net/20.500.12278/95208
Publikováno v:
Astronomy & Astrophysics. 659:A75
The celestial reference frame is realized by absolute positions of extragalactic sources that are assumed to be fixed in the space. The fixing of the axes is one of the crucial points for the International Celestial Reference System (ICRS) concept. H
Autor:
Jia-Cheng Liu, C. Barache, F. Taris, J. Souchay, N. Liu, E. F. Arias, Zi Zhu, Sébastien Lambert
Publikováno v:
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 651, pp.A64. ⟨10.1051/0004-6361/202140652⟩
Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 651, pp.A64. ⟨10.1051/0004-6361/202140652⟩
Aims. We aim to study the relative positions of quasar emission centers at different wavelengths in order to help link the various realizations of the International Celestial Reference System (ICRS), and to unveil systematic uncertainties and individ
Autor:
E. F. Arias, Gérard Petit
Publikováno v:
Annalen der Physik
Annalen der Physik, Wiley, 2018, 531 (5), pp.1900068. ⟨10.1002/andp.201900068⟩
Annalen der Physik, Wiley, 2018, 531 (5), pp.1900068. ⟨10.1002/andp.201900068⟩
International audience; The unit of time of the International System of Units (SI), the "atomic second" was defined through a constant of physics in 1967. It is derived from the frequency of the hyperfine transition of the atom of cesium 133. From th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::60fb98a2f4dee7587ec4f7ce129b18b8
https://hal.sorbonne-universite.fr/hal-02183619/file/Arias_et_al-2019-Annalen_der_Physik.pdf
https://hal.sorbonne-universite.fr/hal-02183619/file/Arias_et_al-2019-Annalen_der_Physik.pdf
Publikováno v:
Metrologia. 52:384-391
In Poland, an accurate two-way optical fibre time transfer (TWOTT) baseline of 420 km has been developed with a standard uncertainty of 112 ps. Meanwhile, the BIPM has been engaged in a pilot project to reduce the uncertainty of UTC GNSS time transfe
Autor:
W Lewandowski, E. F. Arias
Publikováno v:
Metrologia. 48:S219-S224
Global Navigation Satellite Systems (GNSSs) use internal reference time scales: GPS Time, GLONASS Time, Galileo System Time and BeiDou System Time. Constructed from a clock ensemble, they are designed for internal system synchronization, necessary to