Search results for "ESA"
showing 10 items of 11914 documents
Radio Emission from Sgr A*: Pulsar Transits Through the Accretion Disc
2017
Radiatively inefficient accretion flow models have been shown to accurately account for the spectrum and luminosity observed from Sgr A* in the X-ray regime down to mm wavelengths. However, observations at a few GHz cannot be explained by thermal electrons alone but require the presence of an additional non-thermal particle population. Here, we propose a model for the origin of such a population in the accretion flow via means of a pulsar orbiting the supermassive black hole in our Galaxy. Interactions between the relativistic pulsar wind with the disc lead to the formation of a bow shock in the wind. During the pulsar's transit through the accretion disc, relativistic pairs, accelerated at…
New insights on the puzzling LMXB 1RXS J180408.9-342058: the intermediate state, the clocked type-I X-ray bursts and much more
2019
1RXS J180408.9--342058 is a low mass X-ray binary hosting a neutron star, which shows X-ray activity at very different mass-accretion regimes, from very faint to almost the Eddington luminosity. In this work, we present a comprehensive X-ray study of this source using data from the Neil Gehrels Swift Observatory, NuSTAR and INTEGRAL/JEM-X. In order to follow the spectral evolution, we analysed the 2015 outburst using Swift data and three Nustar observations. Besides the canonical hard and soft spectral states, we identified the rarely observed intermediate state. This was witnessed by the appeareance of the accretion disk emission in the spectrum (at $kT_{\rm disk}$ $\sim$0.7 keV) and the s…
ASYMPTOTIC ANALYSIS OF THE LINEARIZED NAVIER–STOKES EQUATION ON AN EXTERIOR CIRCULAR DOMAIN: EXPLICIT SOLUTION AND THE ZERO VISCOSITY LIMIT
2001
In this paper we study and derive explicit formulas for the linearized Navier-Stokes equations on an exterior circular domain in space dimension two. Through an explicit construction, the solution is decomposed into an inviscid solution, a boundary layer solution and a corrector. Bounds on these solutions are given, in the appropriate Sobolev spaces, in terms of the norms of the initial and boundary data. The correction term is shown to be of the same order of magnitude as the square root of the viscosity. Copyright © 2001 by Marcel Dekker, Inc.
Asymptotic stability of solutions to Volterra-renewal integral equations with space maps
2012
Abstract In this paper we consider linear Volterra-renewal integral equations (VIEs) whose solutions depend on a space variable, via a map transformation. We investigate the asymptotic properties of the solutions, and study the asymptotic stability of a numerical method based on direct quadrature in time and interpolation in space. We show its properties through test examples.
Tiesneša atbildība kā instruments taisnīgas tiesas nodrošināšanai
2017
Tā kā tiesa ir vienīgā institūcija, kurai ir tiesības spriest tiesu, svarīgi, lai tiesnesis būtu taisnīgs un tiktu nodrošinātas Satversmē garantētās pamattiesības uz taisnīgu tiesu. Personai ir tiesības uz lietas likumīgu izskatīšanu, ko nodrošina tieši tiesa (tiesnesis). Gan pildot amata pienākumus, gan arī ārpus darba tiesnesim ir jāievēro likumā paredzētās normas un tiesneša ētika. Spriežot tiesu tiesnesim nedrīkst būt savas intereses un viņš ir pakļauts vienīgi likumam. Tiesnesis nes atbildību par to, lai lietas dalībnieki tiktu pie taisnīga lietas iznākuma Likuma normu pārkāpuma gadījumos, tiesnesim jānes atbildība par savu rīcību, un viņš nav no tās atbrīvots. Bakalaura darba temats i…
Instrumentos de evaluación y diagnóstico en la edad comprendida de 0 a 6 años: Descripción, utilización y grado de satisfacción en los Centros de Ate…
2009
Este trabajo pretende conocer cuáles son los instrumentos de evaluación y diagnóstico que utilizan los profesionales que trabajan en los Centros de Atención Temprana de la Comunidad Valenciana, así como la frecuencia de utilización y grado de satisfacción de estos profesionales en relación a los instrumentos que utilizan para la evaluación de los niños. La recogida de datos se realizó entre los profesionales en activo de los centros de Atención Temprana de la comunidad valenciana a través de un cuestionario electrónico. Los resultados obtenidos muestran la falta de presupuesto y la necesidad de formación en instrumentos de evaluación de área de familia entre otros .Se concluye que es necesa…
Sociedades fragiles
2001
El honor de la sociedad civil israeli
2002
The stereographic coordinate system
2003
Lagrangian Description of Air Masses Associated with Latent Heat Release in Tropical Storm Karl (2016) during Extratropical Transition
2019
Abstract Extratropical transition (ET) of tropical cyclones involves distinct changes of the cyclone’s structure that are not yet well understood. This study presents for the first time a comprehensive Lagrangian description of structure change near the inner core. A large sample of trajectories is computed from a convection-permitting numerical simulation of the ET of Tropical Storm Karl (2016). Three main airstreams are considered: those associated with the inner-core convection, inner-core descent, and the developing warm conveyor belt. Analysis of these airstreams is performed both in thermodynamic and physical space. Prior to ET, Karl is embedded in weak vertical wind shear and its int…