The Object Management Group Ontology Definition Metamodel

Report of a submission being made to a major international software engineering standards group, the Object Management Group which ties together OMG standards with World-Wide Web Consortium and International Standards Organization standards. Major industry bodies including IBM are collaborating, and the submission has the support of 24 companies. OMG, W3C and ISO standards strongly influence the industry, especially in combination. Colomb was a major contributor, responsible for 30% of the submission, and the primary author of the paper

The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections

We present the final data release of observations of lambda 21-cm emission from Galactic neutral hydrogen over the entire sky, merging the Leiden/Dwingeloo Survey (LDS: Hartmann & Burton, 1997) of the sky north of delta = -30 deg with the Instituto Argentino de Radioastronomia Survey (IAR: Arnal et al., 2000, and Bajaja et al., 2005) of the sky south of delta = -25 deg. The angular resolution of the combined material is HPBW ~ 0.6 deg. The LSR velocity coverage spans the interval -450 km/s to +400 km/s, at a resolution of 1.3 km/s. The data were corrected for stray radiation at the Institute for Radioastronomy of the University of Bonn, refining the original correction applied to the LDS. The rms brightness-temperature noise of the merged database is 0.07 - 0.09 K. Residual errors in the profile wings due to defects in the correction for stray radiation are for most of the data below a level of 20 - 40 mK. It would be necessary to construct a telescope with a main beam efficiency of eta_{MB} > 99% to achieve the same accuracy. The merged and refined material entering the LAB Survey of Galactic HI is intended to be a general resource useful to a wide range of studies of the physical and structural characteristices of the Galactic interstellar environment. The LAB Survey is the most sensitive Milky Way HI survey to date, with the most extensive coverage both spatially and kinematically.Comment: 9 pages, 5 figures, accepted for publication by Astronomy & Astrophysic

Distribución del hidrógeno neutro a |b| ≥ 10°

Los datos obtenidos en el IAR con el radiotelescopio de 30 m fueron combinados con los obtenidos mediante el radiotelescopio de la Universidad de California en Hat Creek. De esta forma se obtuvieron mapas de la distribución de hidrógeno neutro que cubren todo el cielo, en el rango de velocidades de -40 a +40 km s⁻¹, cada 4 km s⁻¹. Se discuten las principales características de los mismos.Asociación Argentina de Astronomí

Distribución del hidrógeno neutro en el hemisferio sur

Se discuten dos estructuras de HI y sus asociaciones con el continuo, emisión de rayos X y polarización óptica.Asociación Argentina de Astronomí

Relevamiento del cielo austral en la línea de 21 cm y a bajas velocidades

Se está realizando un relevamiento completo del cielo con un espaciado de 1°, en el rango de -50 a 50 km/s. Se lleva realizado 25% del total de observaciones previstas.Asociación Argentina de Astronomí

Observaciones del cometa Kohoutek en 1420 MHz

Entre el 17-12-73 y el 4-1-74 se intentó detectar el cometa Kohoutek 1973b en 1420 MHz en el continuo y en la línea, sin resultado positivo dentro de la sensibilidad del instrumento utilizado.Asociación Argentina de Astronomí

Imaging Gold Nanoparticles in Living Cells Environments using Heterodyne Digital Holographic Microscopy

This paper describes an imaging microscopic technique based on heterodyne digital holography where subwavelength-sized gold colloids can be imaged in cell environment. Surface cellular receptors of 3T3 mouse fibroblasts are labeled with 40 nm gold nanoparticles, and the biological specimen is imaged in a total internal reflection configuration with holographic microscopy. Due to a higher scattering efficiency of the gold nanoparticles versus that of cellular structures, accurate localization of a gold marker is obtained within a 3D mapping of the entire sample's scattered field, with a lateral precision of 5 nm and 100 nm in the x,y and in the z directions respectively, demonstrating the ability of holographic microscopy to locate nanoparticles in living cells environments