2,967 research outputs found
Spectral analysis of Markarian 421 and Markarian 501 with HAWC
The Hight Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory monitors the
gamma-ray sky in the energy range from 100 GeV to 100 TeV and has detected two
very high energy (VHE) blazars: Markarian 421 (Mrk 421) and Markarian 501 (Mrk
501) in 1.5 years of observations. In this work, we present the spectral
analysis above 1 TeV of both sources using a maximum likelihood method and an
artificial neural network as an energy estimator. The main objectives are to
constrain the spectral curvature of Mrk 421 and Mrk 501 at 5 TeV using
the EBL models from Gilmore et al. (2012) and Franceschini et al. (2008).Comment: Presented at the 35th International Cosmic Ray Conference (ICRC2017),
Bexco, Busan, Korea. See arXiv:1708.02572 for all HAWC contribution
Statistical measure of complexity for quantum systems with continuous variables
The Fisher-Shannon statistical measure of complexity is analyzed for a
continuous manifold of quantum observables. It is probed then than calculating
it only in the configuration and momentum spaces will not give a complete
description for certain systems. Then a more general measure for the complexity
of a quantum system by the integration of the usual Fisher-Shannon measure over
all the parameter space is proposed. Finally, these measures are applied to the
concrete case of a free particle in a box.Comment: 6 pages, 5 figures. Published versio
Proteins involved in plateled activation by GPVI and ALPHAIIBBETA3 receptors are differentially regulated in acute coronary symdrome: a platelet proteomics study
Comunicaciones a congreso
Star formation rates of distant luminous infrared galaxies derived from Halpha and IR luminosities
We present a study of the star formation rate (SFR) for a sample of 16
distant galaxies detected by ISOCAM at 15um in the CFRS0300+00 and CFRS1400+52
fields. Their high quality and intermediate resolution VLT/FORS spectra have
allowed a proper correction of the Balmer emission lines from the underlying
absorption. Extinction estimates using the Hbeta/Hgamma and the Halpha/Hbeta
Balmer decrement are in excellent agreement, providing a robust measurement of
the instantaneous SFR based on the extinction-corrected Halpha luminosity. Star
formation has also been estimated exploiting the correlations between IR
luminosity and those at MIR and radio wavelengths. Our study shows that the
relationship between the two SFR estimates follow two distinct regimes: (1) for
galaxies with SFRIR below ~ 100Msolar/yr, the SFR deduced from Halpha
measurements is a good approximation of the global SFR and (2) for galaxies
near of ULIRGs regime, corrected Halpha SFR understimated the SFR by a factor
of 1.5 to 2. Our analyses suggest that heavily extincted regions completely
hidden in optical bands (such as those found in Arp 220) contribute to less
than 20% of the global budget of star formation history up to z=1.Comment: (1) GEPI, Obs. Meudon, France ;(2) CEA-Saclay, France ;(3) ESO,
Gemany ;(4) IAC, Spain. To appear in A&
The effect of activity-related meridional flow modulation on the strength of the solar polar magnetic field
We studied the effect of the perturbation of the meridional flow in the
activity belts detected by local helioseismology on the development and
strength of the surface magnetic field at the polar caps. We carried out
simulations of synthetic solar cycles with a flux transport model, which
follows the cyclic evolution of the surface field determined by flux emergence
and advective transport by near-surface flows. In each hemisphere, an
axisymmetric band of latitudinal flows converging towards the central latitude
of the activity belt was superposed onto the background poleward meridional
flow. The overall effect of the flow perturbation is to reduce the latitude
separation of the magnetic polarities of a bipolar magnetic region and thus
diminish its contribution to the polar field. As a result, the polar field
maximum reached around cycle activity minimum is weakened by the presence of
the meridional flow perturbation. For a flow perturbation consistent with
helioseismic observations, the polar field is reduced by about 18% compared to
the case without inflows. If the amplitude of the flow perturbation depends on
the cycle strength, its effect on the polar field provides a nonlinearity that
could contribute to limiting the amplitude of a Babcock-Leighton type dynamo.Comment: 16 pages, 5 figures, accepted by Ap
The training of investigative skills and their Trends in Educational Leadership. Methodological Proposal
Las dinámicas contemporáneas de la Universidad, condicionan investigaciones
sobre los procesos de formación profesional con especial énfasis en la formación de
las competencias investigativas en docentes y su empoderamiento como líderes
científicos. A estos empeños los académicos e investigadores, prestan sus mejores
esfuerzos, tratando de potenciar una universidad pertinente, capaz de empoderar a
sus profesionales de la plenitud humana liberadora que requiere la sociedad del
siglo XXI. La investigación que se presenta responde a la pregunta ¿Cómo
contribuir a la formación de líderes científicos en las universidades? Situando su
objetivo en desarrollar los procesos de gestión formativa permanente de profesores
investigadores, para así convertirlos en agentes de transformación de los contextos
laborales en sus l territorios. A través de métodos y teorías científicas se revela la
trascendencia de los procesos formativos de investigadores docentes y su valor para
la potenciación de los procesos científicos en la comunidad universitaria.
Desarrollándose una metodología de intervención para la Universidad
UNIANDES, que propicia el surgimiento de líderes investigativosThe contemporary dynamics of the University, condition research on the processes
of professional training with special emphasis on the training of research
competencies in teachers and their empowerment as scientific leaders. To these
efforts academics and researchers, they give their best efforts, trying to promote a
relevant university, capable of empowering their professionals to the liberating
human fullness that society of the 21st century requires. The research that is
presented responds to the question How to contribute to the formation of scientific
leaders in the universities? Setting its objective in developing the processes of
permanent formative management of research professors, so as to transform them
into agents of transformation of labor contexts in their territories. Through
scientific methods and theories the transcendence of the educational processes of
educational researchers and their value for the enhancement of the scientific
processes in the university community is revealed. Developing an intervention
methodology for UNIANDES University, which promotes the emergence of
investigative leader
- …