Reconocimiento y ejecución de laudos extranjeros en Colombia: un análisis crítico a partir del derecho comparado

El presente estudio busca determinar en qué consisten y cómo funcionan el reconocimiento y la ejecución en el ordenamiento jurídico colombiano. Para tal efecto, se estudiarán los fundamentos normativos de ambas figuras y sus implicaciones en nuestro territorio y en el derecho comparado, para luego dar paso a un análisis crítico sobre la jurisprudencia de esta figura. Antes de iniciar con el estudio, será entonces necesario definir las dos figuras para despejar claridad sobre su significado

A fresh perspective on the 3-D dynamics of Tycho's supernova remnant: ejecta asymmetries in X-rays

450 years after the explosion of the Type Ia SN1572, the dynamics of the Tycho supernova remnant can give us keys to understand the explosion mechanism and the interaction of the remnant with the interstellar medium. To probe the asymmetries and the evolution of the SNR, we track the ejecta dynamics using new methods applied to the deep X-ray observations available in the Chandra space telescope archive. For the line of sight velocity measurement Vz, we use the Doppler effect focused on the bright Si line in the 1.6-2.1 keV band. Using the component separation tool General Morphological Component Analysis (GMCA), we successfully disentangle the red and blueshifted Si ejecta emission. This allows us to reconstruct a map of the peak energy of the Si line with a total coverage of the SNR at a 2'' resolution and a proxy of the velocity in the line of sight. For the proper motions in the plane of the sky Vxy, we develop a new method, named Poisson Optical Flow, to measure the displacement of 2D features between the observations of 2003 and 2009. The result is a field of 1700 velocity vectors covering the entire SNR. These exhaustive 3D velocity measurements reveal the complex and patchy dynamics of the SNR. At the large-scale, an asymmetry with the North being dominantly blueshifted and the South redshifted is observed. The proper motion vector field Vxy highlights different dynamics between the East and the West parts of the SNR. The eastern velocity field is more disturbed by external inhomogeneities and the South-East ejecta knot. In particular, a slow-down is observed in the North-East which could be due to the interaction with higher densities as seen in other wavelengths. The vector field is also used to backtrace the center of the explosion which is then compared with potential stellar progenitors distances from the latest Gaia DR3, leaving only stars B and E as possible candidates.Comment: Accepted for publication in A&A. 18 pages, 12 figure

Óxido de cromo soportado en carbones activados como catalizador para deshidrogenación oxidativa de isobutano

A un carbón activado Norit ROX 0.8® se le modificó su química superficial mediante tratamientos en ácido nítrico, en oxígeno diluido al 8,8% en nitrógeno y en hidrógeno. Los materiales se impregnaron con una solución acuosa de CrO3 y se utilizaron en la reacción de deshidrogenación oxidativa (DHO) de isobutano a isobuteno. Se observó formación de isobuteno a 443 K, selectividades hasta del 85 % y rendimientos a isobuteno del 9 %

A joint spectro-imaging analysis of the XMM-Newton and HESS observations of the supernova remnant RX J1713.7-3946

Context. The supernova remnant (SNR) RX J1713.7-3946 (also known as G347.3-0.5) is part of the class of remnants dominated by synchrotron emission in X-rays. It is also one of the few shell-type SNRs observed at TeV energies allowing to investigate particle acceleration at SNRs shock. Aims. Our goal is to compare spatial and spectral properties of the remnant in X- and  -rays to understand the nature of the TeV emission. This requires to study the remnant at the same spatial scale at both energies. To complement the non-thermal spectrum of the remnant, we attempt to provide a reliable estimate for the radio flux density. Methods. In radio, we revisited ATCA data and used HI and mid-infrared observations to disentangle the thermal from the nonthermal emission. In X-rays, we produced a new mosaic of the remnant and degraded the spatial resolution of the X-ray data to the resolution of the HESS instrument to perform spatially resolved spectroscopy at the same spatial scale in X- and  gamma-rays. Radial profiles were obtained to investigate the extension of the emission at both energies. Results. We found that part of the radio emission within the SNR contours is thermal in nature. Taking this into account, we provide new lower and upper limits for the integrated synchrotron flux of the remnant at 1.4 GHz of 22 Jy and 26 Jy respectively. In X-rays, we obtained the first full coverage of RX J1713.7-3946 with XMM-Newton. The spatial variation of the photon index seen at small scale in X-rays is smeared out at HESS resolution. A non-linear correlation between the X- and  gamma-ray fluxes of the type F_X propto F_gamma^2.41   is found. If the flux variation are mainly due to density variation around the remnant then a leptonic model can more easily reproduce the observed X/ -ray correlation. In some angular sectors, radial profiles indicate that the bulk of the X-ray emission comes more from the inside of the remnant than in  gamma-rays.Fil: Acero Barriga, Fabio Nelson. Université Paris Diderot - Paris 7; FranciaFil: Ballet, J.. Université Paris Diderot - Paris 7; FranciaFil: Decourchelle, A.. Université Paris Diderot - Paris 7; FranciaFil: Lemoine Goumard, M.. Centre d’Etudes nucleaires de Bordeaux Gradignan; FranciaFil: Ortega, Martin Eduardo. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Giacani, Elsa Beatriz. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Dubner, Gloria Mabel. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Cassam Chenai, G.. Osservatorio Astrofisico di Arcetri; Itali

Suzaku Observations of the Non-thermal Supernova Remnant HESS J1731-347

A detailed analysis of the nonthermal X-ray emission from the North-Western and Southern parts of the supernova remnant (SNR) HESS J1731$-$347 with {\it Suzaku} is presented. The shell portions covered by the observations emit hard and line-less X-rays. The spectrum can be reproduced by a simple absorbed power-law model with a photon index $\Gamma$ of 1.8-2.7 and an absorption column density $N_{\rm H}$ of (1.0-2.1)$\times 10^{22}$ cm$^{-2}$. These quantities change significantly from region to region; the North-Western part of the SNR has the hardest and most absorbed spectrum. The Western part of the X-ray shell has a smaller curvature than North-Western and Southern shell segments. A comparison of the X-ray morphology to the Very High Energy (VHE) gamma-ray and radio images was performed. The efficiency of electron acceleration and emission mechanism in each portion of the shell are discussed. Thermal X-ray emission from the SNR was searched for but could not be detected at a significant level.Comment: 23 pages, 28 figures, ApJ, in pres

Construcción y confrontación de la teoría a la práctica del docente en primera infancia: caso Centro Regional Buga.

La Corporación Universitaria Minuto de Dios – UNIMINUTO se ha caracterizado por formar personas de manera integral, que no solo se preocupen por su desempeño profesional, sino que tengan un sentido humano dirigido hacia el servicio a los demás. Para ello, su modelo educativo se basa en brindar a los estudiantes unas herramientas para el quehacer, en este caso el pedagógico, orientado hacia una observación inicial de su contexto con todas las implicaciones que de este surjan, la priorización de acciones encaminadas a mejorar las condiciones encontradas en el mismo, el desarrollo de estas y la reflexión de dichas prácticas desarrolladas. Particularmente en la primera infancia, dentro de las prácticas pedagógicas que realizan los estudiantes del programa de Licenciatura en Pedagogía Infantil del Centro Regional Buga está inmerso dicho modelo educativo; en este se logra vislumbrar cómo a través de las diferentes propuestas realizadas en las instituciones educativas de los municipios del centro del Valle se obtiene la transformación de los contextos de manera óptima, siguiendo una a una las fases del modelo para así tener unas mejores prácticas pedagógicas en beneficio de los niños y las niñas del país