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Search Results: 1 - 10 of 190 matches for " Ilesh; Mirabal "
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Gender differences in presbyopia
Ilesh Patel,Sheila West
Community Eye Health Journal , 2009,
Abstract: Presbyopia is the loss of lens accommodation with age that results in an inability to focus at near distances. It is receiving growing attention because of the recognition that good near vision is needed to accomplish a broad range of tasks, not only reading and writing.
Presbyopia: prevalence, impact, and interventions
Ilesh Patel,Sheila K West
Community Eye Health Journal , 2007,
Abstract: Presbyopia is an age-related loss of lens accommodation that results in an inability to focus at near distances. It is the most common physiological change occurring in the adult eye and is thought to cause universal near vision impairment with advancing age.
Alberto Mirabal
Scientia Et Technica , 2004,
Scientia Et Technica , 2008,
Abstract: El propósito del presente trabajo consiste en establecer conexiones entre el impacto de la formación y asistencia cross-cultural con relación a los fracasos foráneos. Así, una revisión de distintas investigaciones teóricas y empíricas sobre los mencionados tópicos y los resultados obtenidos en 19 de 44 casos donde hubo formación y asistencia cross-cultural, permitieron expresar un cuerpo de consideraciones que con aproximación en la teoría de agencia ratificaron la importancia de la respectiva práctica para reducir desajustes externos en el personal expatriado, si bien se advierte que su efectividad puede estar supeditada a distintos condicionantes vinculantes con la materia.
A Curious Source of Extended X-ray Emission in the Outskirts of Globular Cluster GLIMPSE-C01
N. Mirabal
Physics , 2009, DOI: 10.1111/j.1365-2966.2009.15984.x
Abstract: We report the discovery of an unusual source of extended X-ray emission CXOU J184846.3-013040 (`The Stem') located on the outskirts of the globular cluster GLIMPSE-C01. No point-like source falls within the extended emission which has an X-ray luminosity L_X =10^{32} ergs/s and a physical size of 0.1 pc at the inferred distance to the cluster. These X-ray properties are consistent with the pulsar wind nebula (PWN) of an unseen pulsar located within the 95-percent confidence error contour of unidentified Fermi gamma-ray source 0FGL J1848.6-0138. However, we cannot exclude an alternative interpretation that postulates X-ray emission associated with a bow shock produced from the interaction of the globular cluster and interstellar gas in the Galactic plane. Analysis of the X-ray data reveals that `The Stem' is most significant in the 2-5 keV band, which suggests that the emission may be dominated by non-thermal bremsstrahlung from suprathermal electrons at the bow shock. If the bow shock interpretation is correct, these observations would provide compelling evidence that GLIMPSE-C01 is shedding its intracluster gas during a galactic passage. Such a direct detection of gas stripping would help clarify a crucial step in the evolutionary history of globular clusters. Intriguingly, the data may also accommodate a new type of X-ray source.
A Point-Source Catalog from Swift Observations of Unidentified Fermi Sources
N. Mirabal
Physics , 2009,
Abstract: We present X-ray point source catalogs obtained from archival Swift observations that have partially or fully covered the 95% confidence error contour of unidentified Fermi sources. In total, 21 out of 37 unidentified Fermi sources have been observed by the X-Ray Telescope (XRT) on board the Swift observatory. Basic properties such as position, positional errors, count rates, and hardness ratios are derived for a total of 18 X-ray point sources found in the sample. From these detections, we discuss potential counterparts to 0FGL J0910.2-5044, 0FGL J1045.6-5937, 0FGL J1115.8-6108, 0FGL J1231.5-1410, 0FGL J1326.6-5302, 0FGL J1604.0-4904, and 0FGL J1805.3-2138. The catalog will assist observers planning future programs to identify 0FGL sources without obvious counterparts.
Dark matter vs. Pulsars: Catching the impostor
N. Mirabal
Physics , 2013, DOI: 10.1093/mnras/stt1740
Abstract: Evidence of excess GeV emission nearly coinciding with the Galactic Centre has been interpreted as a possible signature of annihilating dark matter. In this paper, we argue that it seems too early to discard pulsars as a viable explanation for the observed excess. On the heels of the recently released Second Fermi LAT Pulsar Catalogue (2FPC), it is still possible that a population of hard (Gamma < 1) millisecond pulsars (MSPs) either endemic to the innermost region or part of a larger nascent collection of hard MSPs that appears to be emerging in the 2FPC could explain the GeV excess near the Galactic Centre.
Pareidolic Dark Matter (PaDaM)
N. Mirabal
Physics , 2013,
Abstract: A pareidolic conjecture for the Fermi Large Area Telescope.
Swift observation of Segue 1: constraints on sterile neutrino parameters in the darkest galaxy
N. Mirabal
Physics , 2010, DOI: 10.1111/j.1745-3933.2010.00963.x
Abstract: Some extensions of standard particle physics postulate that dark matter may be partially composed of weakly interacting sterile neutrino particles that have so far eluded detection. We use a short (~5 ks) archival X-ray observation of Segue 1 obtained with the X-ray Telescope (XRT) onboard the Swift satellite to exclude the presence of sterile neutrinos in the 1.6 - 14 keV mass range down to a flux limit of 6 x 10^{-12} erg cm-2 s-1 within 67 pc of its centre. With an estimated mass-to-light ratio of ~3400 Msun/Lsun, Segue 1 is the darkest ultrafaint dwarf galaxy currently measured. Spectral analysis of the Swift XRT data fails to find any non-instrumental spectral feature possibly connected with the radiative decay of a dark matter particle. Accordingly, we establish upper bounds on the sterile neutrino parameter space based on the non-detection of emission lines in the spectrum. The present work provides the most sensitive X-ray search for sterile neutrinos in a region with the highest dark matter density yet measured.
Annihilating dark matter or noise?: A statistical examination of the Fermi GeV excess around the Galactic Centre
Nestor Mirabal
Physics , 2014,
Abstract: Excess Fermi GeV emission around the Galactic Centre has been interpreted as a possible signature of annihilating dark matter. Here we analyse three aspects of this claim: its spectral cutoff, the correlation between the spectral shape of the purported signal and known noise components, and its brightness profile. Experimentally, the correlations that exist between the GeV excess and known sources of noise make it difficult to conclude that a dark matter signal claim can be made without independent direct detection confirmation. As a possible way forward, we introduce three criteria that could potentially help to validate a dark matter annihilation signal in gamma rays.
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