Desarrollo de un “Sistema de Gestión de Contenidos” para desarrollos informáticos, basado en Plone

En las últimas décadas en el INTA se desarrollaron decenas de aplicaciones informáticas y sistemas de información de las que no se tiene debida cuenta. Se requiere de un mecanismo de registro, comunicación y seguimiento de todos los desarrollos (software y servicios informáticos), que permita y facilite una dinámica de gestión del conocimiento, que incluya a los desarrolladores, a la comunidad de usuarios y a las propias áreas de gestión del INTA. AgroTank ofrece una solución a esta problemática, mediante una plataforma on-line que, bajo el enfoque CMS (Content Management System) permite realizar una completa administración de los mismos, permitiéndo a la institución conocer y dar a conocer todo su potencial informático y capacidades.Sociedad Argentina de Informática e Investigación Operativ

Desarrollo experimental de prototipos de techo solar de bajo costo

Se presenta el desarrollo experimental de los primeros prototipos de un nuevo diseño conceptual de techo solar configurable, cuya innovación radica en proveer de calefacción solar y refrigeración natural a las viviendas, mediante redistribución de agua. El estudio experimental ha demostrado la factibilidad de su construcción empleando técnicas y materiales de construcción convencionales. Se discuten sus costos, que podrían ser similares a los de un techo convencional de similar calidad térmica, y que por lo tanto permitirían aplicar este sistema sobre toda la superficie del techado. Resultados preliminares permiten estimar que en condiciones de clima patagónico se podrían obtener eficiencias como colector solar en el rango del 30% al 50%. Se discute las fortalezas y debilidades de este diseño y otras posibles variantes del mismo también en estudio, que podrían servir para mejorar su desempeño y generalizar su aplicación a techos preexistentes y/o inclinados.The experimental development of prototypes relates a new conceptual design of a configurable solar roof is presented. Its innovation involve a solution for the solar heating and natural cooling of houses, by means of water redistribution. The feasibility of concept by using standard constructions materials and techniques is checked. The cost analyze shows this roof could achieve similar cost than conventional roofs. Preliminary, initial results have shown than efficiencies as solar collector ranging from 30% to 50% could be achievable in this configuration. The strengths and weaknesses of this design are discussed, together with other possible variations of this original design. These variations could be useful for implementing this solar roof onto older and (or) titled roofs.Asociación Argentina de Energías Renovables y Medio Ambiente (ASADES

Resonance production by neutrinos: I. J=3/2 Resonances

The article contains general formulas for the production of J=3/2 resonances by neutrinos and antineutrinos. It specializes to the P_{33}(1232) resonance whose form factors are determined by theory and experiment and then are compared with experimental results at low and high energies. It is shown that the minimum in the low Q^2 region is a consequence of a combined effect from the vanishing of the vector form factors, the muon mass and Pauli blocking. Several improvements for the future investigations are suggested.Comment: 10 pages, LaTeX, misprints corrected, 1 reference adde

Effects of nuclear re-interactions in quasi-elastic neutrino-nucleus scattering

The effects of nuclear re-interactions in the quasi-elastic neutrino-nucleus scattering are investigated with a phenomenological model. We found that the nuclear responses are lowered and their maxima are shifted towards higher excitation energies. This is reflected on the total neutrino-nucleus cross section in a general reduction of about 15% for neutrino energies above 300 MeV.Comment: 15 pages, 5 figures. Submitted to AstroParticle Physic

Constraints on Recoil Leader Properties Estimated from X-ray Emissions in Aircraft-Triggered Discharges

During Airbus aircraft campaigns flying into thunderstorms in 2014–2016, X-rays were observed during two stages of aircraft-triggered lightning: nanosecond pulses of X-rays associated with negative leader steps and bursts of X-rays during recoil events. This work will focus on the observations of X-ray bursts associated with recoils. Recoils are observed as microsecond-fast changes in the local electric field, associated with large currents passing through the aircraft, and are found to sometimes be associated with bursts of X-rays. From over 200 aircraft-triggered lightning strikes, 54 recoil events were found to be associated with microsecond bursts of X-rays. The majority of the bursts consist of 1–3 X-ray pulses, with some bursts containing as many as 29 X-ray pulses. We compare the observed superposed X-ray spectrum with modeled spectra using a GEANT4 model of the detector and aircraft, to determine the source potential needed to accelerate the electrons that produce the observed X-rays. A model of the recoil leader was made to determine the gap distance and gap potential between the recoil leader and the aircraft. From the modeling, we determine a solution space for the gap and leader lengths where the gap length is constrained by the observed minimum and maximum times between the onset of the X-ray pulses and the onset of the current pulses detected at the aircraft (1 to 93 m). We also find two constraints from the fitting of the modeled spectra to the superposed spectrum, limiting the leader length to between 1 and ∼240 m.publishedVersio

Testing J/psi Production and Decay Properties in Hadronic Collisions

The polar and azimuthal angular distributions for the lepton pair arising from the decay of a J/psi meson produced at transverse momentum p_T balanced by a photon [or gluon] in hadronic collisions are calculated in the color singlet model (CSM). It is shown that the general structure of the decay lepton distribution is controlled by four invariant structure functions, which are functions of the transverse momentum and the rapidity of the J/psi. We found that two of these structure functions [the longitudinal and transverse interference structure functions] are identical in the CSM. Analytical and numerical results are given in the Collins-Soper and in the Gottfried-Jackson frame. We present a Monte Carlo study of the effect of acceptance cuts applied to the leptons and the photon for J/psi+ gamma production at the Tevatron.Comment: 22 pages (LaTeX) plus 11 postscript figures, MAD/PH/822, YUMS94-11. Figures are available from the authors or as a compressed tar file via anonymous ftp at phenom.physics.wisc.edu in directory {}~pub/preprints/madph-94-822-figs.tar.