CCTF 2015: Report of the Royal Observatory of Belgium
نویسنده
چکیده
The Precise Time Facility (PTF) of the Royal Observatory of Belgium (ROB) contains presently 4 Cesium clocks HP5071A, one with standard tubes (since 1995), and three with High Perf. Tubes (since 2012), and one active H-maser CH175A (since 2006). UTC(ORB) is generated from the CH1-75A frequency, steered weekly upon the rapid UTC values. Due to an important maser failure, UTC(ORB) was generated by a Cesium clock between 07-2013 and 06-2015.
منابع مشابه
Contributions of Tidal Poisson Terms in the Theory of the Nutation of a Nonrigid Earth
The tidal potential generated by bodies in the solar system contains Poisson terms, i.e., periodic terms with linearly time-dependent amplitudes. The influence of these terms in the Earth’s rotation, although expected to be small, could be of interest in the present context of high accuracy modelling. We have studied their contribution in the rotation of a non rigid Earth with elastic mantle an...
متن کاملMaraghe Observatory and an Effort towards Retrieval of Architectural Design of Astronomical Units
Maraghe observatory was built by such engineers as Moayiededdin Orozi etc. under supervision of Khaje Nasireddin Tousi in 7th century AH. The most significant feature associated with Maraghe observatory is the fact that architecture is employed to achieve astronomical purposes in this site. The reason for preferring observatory by astronomers was the fact that these units are superior to wooden...
متن کاملFORWARD: A Toolset for Multiwavelength Coronal Magnetometry
High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO, USA, Goddard Space Flight Center, National Aeronautics and Space Administration (NASA), Greenbelt, MD, USA, 3 Air Force Research Labs, Kirtland Air Force Base, Albuquerque, NM, USA, Department of Physics, Metro State University Denver, Denver, CO, USA, Department of Physics, Indiana University, Bloomington, IN, US...
متن کاملLifecycle of a Large-Scale Polar Coronal Pseudostreamer/Cavity System
Departamento de Astrofísica, Instituto de Astrofísica de Canarias, La Laguna, Universidad de La Laguna, La Laguna, Spain, 2 Royal Observatory of Belgium, Uccle, Belgium, Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, USA, National Centers for Environmental Information, National Oceanic and Atmospheric Administration, Boulder, CO, USA, ...
متن کاملA cytoplasmic C-terminal fragment of syndecan-1 is generated by sequential proteolysis and antagonizes syndecan-1 dependent lung tumor cell migration
Syndecan-1 is a surface expressed heparan sulphate proteoglycan, which is upregulated by several tumor types and involved in tumor cell migration and metastasis. Syndecan-1 is shed from the cell surface and the remaining transmembrane fragment undergoes intramembrane proteolysis by γ-secretase. We here show that this generates a cytoplasmic C-terminal fragment (cCTF). In epithelial lung tumor A...
متن کامل