Molecular biotransformation of 2-phenylthiazolidine (1) and its m-bromo derivative (2) in the mouse is followed by autoradiographic studies and assessed by analysis of urinary metabolites. Cysteamine ...(4) is one of the metabolites of compounds 1 and 2. Radioprotective activity and efficacy over a period of time of 1, 2, and 4 correlate closely with distribution and metabolism.
This paper proposes a method for the behavioral modeling of 1/f/sup 1/ noise sources, dedicated to time domain simulations. This method is theoretically based on fractional differentiation. The ...behavioral models are implemented in VHDL-AMS. As an illustration, examples of basic noise voltage sources (white and 1/f noise) are given and analyzed. The concept is then re-used to simulate noise effects on a sigma-delta modulator.
AMBER: a near infrared focal instrument for the VLTI Petrov, Romain G.; Malbet, Fabien; Richichi, Andrea ...
Comptes rendus de l'Académie des sciences. Série IV, Physique, astrophysique,
2001, 2001-1-00, Letnik:
2, Številka:
1
Journal Article
Odprti dostop
AMBER is the General User near-infrared focal instrument of the Very Large Telescope interferometer. Its specifications are based on three key programs on Young Stellar Objects, Active Galactic ...Nuclei central regions, masses and spectra of hot Extra Solar Planets. It has an imaging capacity because it combines up to three beams and very high accuracy measurement are expected from the spatial filtering of beams by single mode fibers and the comparison of measurements made simultaneously in different spectral channels.
AMBER est l'instruments focal proche infra rouge du mode interférométrique du Très Grand Télescope Européen. Les spécifications de cet instrument généraliste ont été définies pour trois programmes clefs sur les systèmes stellaires en formation, les régions centrales des noyaux actifs de galaxies et les masses et les spectres de planètes extra solaires géantes chaudes. Il combine trois faisceaux, ce qui lui donne une capacité de reconstruction d'images, et est optimisé pour la précision des mesures grâce à un filtrage spatial des faisceaux par des fibres optiques mono mode et à une combinaison des informations obtenues simultanément à différentes longueurs d'onde.
We describe an improved perfusion system designed for NMR studies with 13C-labeled metabolites. Using this system we have monitored the uptake and metabolism of 13Cacetate and 13Cglucose in pooled ...human lymphocytes cast in an agarose gel thread.
Impact of High Spectral Resolution on Stellar Interferometry Jankov, S; Vakili, F; Souza, A de Domiciano ...
The Power of Optical/IR Interferometry: Recent Scientific Results and 2nd Generation Instrumentation (ESO Astrophysics Symposia Series),
04/2007
Book Chapter
In this contribution we review a selection of outstanding problems in stellar physics showing the potential of new methods which combine the classical spectroscopy and Long Baseline Interferometry, ...providing informations that cannot be obtained otherwise with each of these techniques taken separately.
In this work, we present the first AMBER observations, of the Wolf-Rayet and
O (WR+O) star binary system y2 Velorum. The AMBER instrument was used with the
telescopes UT2, UT3, and UT4 on baselines ...ranging from 46m to 85m. It delivered
spectrally dispersed visibilities, as well as differential and closure phases,
with a resolution R = 1500 in the spectral band 1.95-2.17 micron. We interpret
these data in the context of a binary system with unresolved components,
neglecting in a first approximation the wind-wind collision zone flux
contribution. We show that the AMBER observables result primarily from the
contribution of the individual components of the WR+O binary system. We discuss
several interpretations of the residuals, and speculate on the detection of an
additional continuum component, originating from the free-free emission
associated with the wind-wind collision zone (WWCZ), and contributing at most
to the observed K-band flux at the 5% level. The expected absolute separation
and position angle at the time of observations were 5.1±0.9mas and
66±15° respectively. However, we infer a separation of
3.62+0.11-0.30 mas and a position angle of 73+9-11°. Our analysis thus
implies that the binary system lies at a distance of 368+38-13 pc, in agreement
with recent spectrophotometric estimates, but significantly larger than the
Hipparcos value of 258+41-31 pc.
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