475 research outputs found
Physical Electronics and Surface Physics
Contains research objectives, summary of research and reports on two research projects.Joint Services Electronics Programs (U. S. Army, U. S. Navy, and U. S. Air Force) under Contract DAAB07-71-C-0300National Aeronautics and Space Administration (Grant NGR 22-009-091
Physical Electronics and Surface Physics
Contains reports on two research projects.National Aeronautics and Space Administration (Grant NGR 22-009-091)Joint Services Electronics Programs (U. S. Army, U. S. Navy, and U. S. Air Force) under Contract DA 28-043-AMC-02536(E
PLAN2L: a web tool for integrated text mining and literature-based bioentity relation extraction
There is an increasing interest in using literature mining techniques to complement information extracted from annotation databases or generated by bioinformatics applications. Here we present PLAN2L, a web-based online search system that integrates text mining and information extraction techniques to access systematically information useful for analyzing genetic, cellular and molecular aspects of the plant model organism Arabidopsis thaliana. Our system facilitates a more efficient retrieval of information relevant to heterogeneous biological topics, from implications in biological relationships at the level of protein interactions and gene regulation, to sub-cellular locations of gene products and associations to cellular and developmental processes, i.e. cell cycle, flowering, root, leaf and seed development. Beyond single entities, also predefined pairs of entities can be provided as queries for which literature-derived relations together with textual evidences are returned. PLAN2L does not require registration and is freely accessible at http://zope.bioinfo.cnio.es/plan2l
High-efficiency Autonomous Laser Adaptive Optics
As new large-scale astronomical surveys greatly increase the number of
objects targeted and discoveries made, the requirement for efficient follow-up
observations is crucial. Adaptive optics imaging, which compensates for the
image-blurring effects of Earth's turbulent atmosphere, is essential for these
surveys, but the scarcity, complexity and high demand of current systems limits
their availability for following up large numbers of targets. To address this
need, we have engineered and implemented Robo-AO, a fully autonomous laser
adaptive optics and imaging system that routinely images over 200 objects per
night with an acuity 10 times sharper at visible wavelengths than typically
possible from the ground. By greatly improving the angular resolution,
sensitivity, and efficiency of 1-3 m class telescopes, we have eliminated a
major obstacle in the follow-up of the discoveries from current and future
large astronomical surveys.Comment: Published in ApJL. 6 pages, 4 figures, and 1 tabl
NuSTAR Discovery of a Cyclotron Line in the Be/X-ray Binary RX J0520.5-6932 During Outburst
We present spectral and timing analysis of NuSTAR observations of RX
J0520.56932 in the 3-79 keV band collected during its outburst in January
2014. The target was observed on two epochs and we report the detection of a
cyclotron resonant scattering feature with central energies of keV and keV during the two
observations, respectively, corresponding to a magnetic field of G. The 3-79 keV luminosity of the system during the two epochs
assuming a nominal distance of 50 kpc was and
. Both values are much higher
than the critical luminosity of
above which a radiation dominated shock front may be expected. This adds a new
object to the sparse set of three systems that have a cyclotron line observed
at luminosities in excess of . A broad
( keV) Fe emission line is observed in the spectrum at a
central energy of keV in both epochs. The pulse profile
of the pulsar was observed to be highly asymmetric with a sharply rising and
slowly falling profile of the primary peak. We also observed minor variations
in the cyclotron line energy and width as a function of the rotation phase.% As
in observations of other cyclotron absorption line sources, there is a small
() phase difference between the peak of the cyclotron
energy variation and the peak of the flux variation.Comment: 9 pages, 4 figures, 6 tables. Accepted to Ap
The Rise of SN 2014J in the Nearby Galaxy M82
We report on the discovery of SN 2014J in the nearby galaxy M82. Given its proximity, it offers the best opportunity to date to study a thermonuclear supernova (SN) over a wide range of the electromagnetic spectrum. Optical, near-IR, and mid-IR observations on the rising light curve, orchestrated by the intermediate Palomar Transient Factory, show that SN 2014J is a spectroscopically normal Type Ia supernova (SN Ia), albeit exhibiting high-velocity features in its spectrum and heavily reddened by dust in the host galaxy. Our earliest detections start just hours after the fitted time of explosion. We use high-resolution optical spectroscopy to analyze the dense intervening material and do not detect any evolution in the resolved absorption features during the light curve rise. Similar to other highly reddened SNe Ia, a low value of total-to-selective extinction, R_V ≲ 2, provides the best match to our observations. We also study pre-explosion optical and near-IR images from Hubble Space Telescope with special emphasis on the sources nearest to the SN location
Phase-resolved NuSTAR and Swift-XRT Observations of Magnetar 4U 0142+61
We present temporal and spectral analysis of simultaneous 0.5-79 keV
Swift-XRT and NuSTAR observations of the magnetar 4U 0142+61. The pulse profile
changes significantly with photon energy between 3 and 35 keV. The pulse
fraction increases with energy, reaching a value of ~20%, similar to that
observed in 1E 1841-045 and much lower than the ~80% pulse fraction observed in
1E 2259+586. We do not detect the 55-ks phase modulation reported in previous
Suzaku-HXD observations. The phase-averaged spectrum of 4U 0142+61 above 20 keV
is dominated by a hard power law with a photon index, ~ 0.65, and the
spectrum below 20 keV can be described by two blackbodies, a blackbody plus a
soft power law, or by a Comptonized blackbody model. We study the full
phase-resolved spectra using the electron-positron outflow model of Beloborodov
(2013). Our results are consistent with the parameters of the active j-bundle
derived from INTEGRAL data by Hascoet et al. (2014). We find that a significant
degeneracy appears in the inferred parameters if the footprint of the j-bundle
is allowed to be a thin ring instead of a polar cap. The degeneracy is reduced
when the footprint is required to be the hot spot inferred from the soft X-ray
data.Comment: 14 pages, 8 figures, 4 tables. Accepted for publication in Ap
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