A. H. Andrei
A5003787407- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- History and Developments in Astronomy
- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Inertial Sensor and Navigation
- Historical Astronomy and Related Studies
- Adaptive optics and wavefront sensing
- Solar Radiation and Photovoltaics
- Planetary Science and Exploration
- Radio Astronomy Observations and Technology
- Diamond and Carbon-based Materials Research
- GNSS positioning and interference
- Metal and Thin Film Mechanics
- Scientific Research and Discoveries
- Neuroscience and Neural Engineering
- Acoustic Wave Resonator Technologies
- Astrophysics and Cosmic Phenomena
- Historical and Architectural Studies
- Atmospheric Ozone and Climate
- Advanced MEMS and NEMS Technologies
Victor Babeș University of Medicine and Pharmacy Timișoara
2024
IMEC
2009-2024
National Observatory
2011-2022
Universidade Federal do Rio de Janeiro
2008-2021
Systèmes de Référence Temps-Espace
2010-2020
Centre National de la Recherche Scientifique
2011-2020
Sorbonne Université
2013-2020
Observatoire de Paris
2009-2020
Université Paris Sciences et Lettres
2016-2020
Valongo Observatory
2010-2019
Gaia Data Release 2 (Gaia DR2) contains results for 1693 million sources in the magnitude range 3 to 21 based on observations collected by European Space Agency satellite during first 22 months of its operational phase. We describe input data, models, and processing used astrometric content DR2, validation these performed within astrometry task. Some 320 billion centroid positions from pre-processed CCD were estimate five parameters (positions, parallaxes, proper motions) 1332 sources,...
Gaia Data Release 1 (Gaia DR1) contains astrometric results for more than billion stars brighter magnitude 20.7 based on observations collected by the satellite during first 14 months of its operational phase. We give a brief overview content data release and model assumptions, processing, validation results. For in common with Hipparcos Tycho-2 catalogues, complete single-star solutions are obtained incorporating positional information from earlier catalogues. other only their positions...
We report the discovery of 76 new T dwarfs from UKIDSS Large Area Survey (LAS). Near-infrared broad and narrow-band photometry spectroscopy are presented for objects, along with WISE warm-Spitzer photometry. Proper motions 128 a two epoch LAS proper motion catalogue. use these to identify benchmark systems: LHS 6176AB, T8+M4 pair HD118865AB, T5.5+F8 pair. Using age constraints primaries evolutionary models constrain radii we have estimated their physical properties bolometric luminosity....
Context. The first data release from the Gaia mission contains accurate positions and magnitudes for more than a billion sources, proper motions parallaxes majority of 2.5 million Hipparcos Tycho-2 stars.
The second release of Gaia data (Gaia DR2) contains the astrometric parameters for more than half a million quasars. This set defines kinematically non-rotating reference frame in optical domain referred to as Gaia-CRF2. Gaia-CRF2 is first realisation global that meets ICRS prescriptions, meaning it built only on extragalactic sources. It consists positions sample 556 869 sources DR2, obtained from positional cross-match with ICRF3-prototype and AllWISE AGN catalogues. constitutes clean,...
As part of the data processing for Gaia Data Release~1 (Gaia DR1) a special astrometric solution was computed, so-called auxiliary quasar solution. This gives positions selected extragalactic objects, including radio sources in second realisation International Celestial Reference Frame (ICRF2) that have optical counterparts bright enough to be observed with Gaia. A subset these used align positional reference frame DR1 ICRF2. We describe properties matched ICRF2, and compare their at sub-mas...
We present near-infrared spectroscopy for 52 ultracool dwarfs, including two newly discovered late-M one new subdwarf candidate, three L and four T dwarfs. also parallaxes proper motions 21 of them. Four the targets presented here have previous parallax measurements, while all others are values. This allow us to populate further spectral sequence at early types (L0-L4). Combining astrometric parameters with here, we able investigate nature some objects. In particular, find that peculiar blue...
FlexRay will very likely become the de-facto standard for in-vehicle communications. However, before it can be successfully used safety-critical applications that require predictability, timing analysis techniques are necessary providing bounds message communication times. In this paper, we propose determining properties of messages transmitted in both static (ST) and dynamic (DYN) segments a cycle. The integrated context holistic schedulability computes worst-case response times all tasks...
We present results from the PARallaxes of Southern Extremely Cool objects (PARSEC) program, an observational program begun in 2007 April to determine parallaxes for 122 L and 28 T southern hemisphere dwarfs using Wide Field Imager on ESO 2.2 m telescope. The presented here include 10 targets observations over 18 months a first version proper motion catalog. motions were obtained by combining PARSEC astrometrically reduced with respect Second US Naval Observatory CCD Astrograph Catalog, Two...
In this study, the effect of insertion speed on long-term tissue response and mechanics was investigated. A dummy silicon parylene-coated probe used in context implanted rat brain at 10 μm/s (n = 6) or 100 to a depth 9 mm. The were assessed by dimpling distance, force point penetration, end phase, after 3-min rest period brain. After 6 weeks, evaluated estimating amount gliosis, inflammation, neuronal cell loss with immunohistochemistry. No difference dimpling, penetration force, observed....
The discovery and subsequent detailed study of T dwarfs have provided many surprises pushed the physics modelling cool atmospheres in unpredicted directions. Distance is a critical parameter for studies these objects to determine intrinsic luminosities, test binarity measure their motion Galaxy. We describe new observational programme distances across full range T-dwarf subtypes using New Technology Telescope (NTT)/SOFI telescope/instrument combination. present preliminary results ten...
Context. From an astrometric point of view, quasars constitute quasi-ideal reference objects in the celestial sphere, with a priori absence proper motion. Since second release Large Quasar Astrometric Catalog (LQAC), large number have been discovered, particular upcoming new SDSS catalog.
The mechanical damage caused by the insertion of a foreign body into living tissue is inevitable, especially when considerable stiffness mismatch present, as in case micromachined neural implants and brain tissue. However, response surface model based on central composite experimental design described this study showed that for particular configurations implant tip angle, width, thickness or speed, some these factors could be safely increased without causing an unwanted significant force...
<i>Context. <i/>We investigate transneptunian objects, including Pluto and its satellites, by stellar occultations.<i>Aims. <i/>Our aim is to derive precise, astrometric predictions for occultations satellites Charon, Hydra Nix 2008-2015. We construct an star catalog in the UCAC2 system covering Plutos sky path.<i>Methods. carried out 2007 observational program at ESO2p2/WFI instrument path of from 2008 2015. made astrometry 110 GB images with Platform Reduction Astronomical Images...
Several studies have demonstrated that understanding certain brain functions can only be achieved by simultaneously monitoring the electrical activity of many individual neurons in multiple areas [1]. Therefore, main tradeoff neural probe design is between minimizing dimensions and achieving high spatial resolution using large arrays small recording sites. Current state-of-the-art solutions are limited amount simultaneous readout channels [2], contain a number electrodes [2,3] or use hybrid...