Maquetas virtuales dinámicas : aplicación a la docencia e investigación sobre formas arquitectónicas

Las explicaciones de los temas de análisis de cuerpos así como de sus secciones e intersecciones entre sí suelen ser unos temas que resultan difíciles de asimilar por el alumnado. Por otro lado la confección de problemas sobre estos temas también presenta sus dificultades al profesor en cuanto a encajar el problema adecuadamente en sus posiciones y medidas para hacerlo compatible con los límites del formato usado para su resolución. En la presente ponencia se abordan estos temas mediante un tratamiento que involucra la confección de maquetas 3D que permitan al profesor desarrollar estos temas y hacer presentaciones con maquetas virtuales, susceptibles de movimientos, para mostrar las soluciones así como hacer los análisis que se estimen oportunos. Palabras clave: maquetas, maquetas virtuales, docencia de Expresión Gráfica, investigación y análisis de formas. Abstract The explanations of the topics of analysis of bodies as well as of their sections and intersections among if they are usually some topics that they are difficult to assimilate for the pupil. On the other hand the making of problems on these topics also introduces its difficulties to the professor as for inserting the problem appropriately in its positions and measures to make it compatible with the limits of the format used for its resolution. In the present report these topics are approached by means of a treatment that involves the making of scale models 3D that allow the professor to develop these topics and to make presentations with virtual scale models, susceptible of movements, to show the solutions as well as to make the analyses that are considered opportune. Words key: scale models, virtual scale models, docencia of Graphic Expression, investigation and analysis in ways

Time scale of forerunners in quantum tunneling

The forerunners preceding the main tunneling signal of the wave created by a source with a sharp onset or by a quantum shutter, have been generally associated with over-the-barrier (non-tunneling) components. We demonstrate that, while this association is true for distances which are larger than the penetration lenght, for smaller distances the forerunner is dominated by under-the-barrier components. We find that its characteristic arrival time is inversely proportional to the difference between the barrier energy and the incidence energy, a tunneling time scale different from both the phase time and the B\"uttiker-Landauer (BL) time.Comment: Revtex4, 14 eps figure

El reconocimiento de los aprendizajes adquiridos por la experiencia previa: un nuevo reto para el sistema universitario

El propósito del Reconocimiento de los Aprendizajes derivados de la Experiencia Previa (RAEP) es hacer visible el abanico de competencias que posee una persona, independientemente del contexto donde la adquisición de éstas tuvo lugar. En este artículo se analiza el papel del reconocimiento del aprendizaje experiencial dentro de una visión amplia de la educación y se presentan sus elementos clave. Se comenta el rol del RAEP en la educación superior, señalando asimismo las oportunidades y desafíos que este tipo de procesos impone a los protagonistas de la enseñanza universitaria

Implementation of Spin Hamiltonians in Optical Lattices

We propose an optical lattice setup to investigate spin chains and ladders. Electric and magnetic fields allow us to vary at will the coupling constants, producing a variety of quantum phases including the Haldane phase, critical phases, quantum dimers etc. Numerical simulations are presented showing how ground states can be prepared adiabatically. We also propose ways to measure a number of observables, like energy gap, staggered magnetization, end-chain spins effects, spin correlations and the string order parameter

The CaT strength in Seyfert nuclei revisited: analyzing young stars and non-stellar light contributions to the spectra

In a former paper (Garcia-Rissmann et al. 2005; hereafter Paper I), we have presented spectra of 64 active, 9 normal and 5 Starburst galaxies in the region around the near-IR Calcium triplet absorption lines and the [SIII]9069 line. In the present paper we analyze the CaT strength (WCaT), and kinematical products derived in that study, namely stellar and ionized gas velocity dispersions. Our main results may be summarized as follows: (1) Seyfert 2s show no sign of dilution in WCaT with respect to the values spanned by normal galaxies, even when optical absorption lines such as the CaII K band at 3933 A are much weaker than in old, bulge-like stellar populations. (2) The location of Seyfert 2s in the WCaT-WCaK plane is consistent with evolutionary synthesis models. The implication is that the source responsible for the dilution of optical lines in these AGN is a young stellar population, rather than an AGN featureless continuum, confirming the conclusion of the pioneer study of Terlevich, Diaz & Terlevich. (3) In Seyfert 1s, both W[SIII] and WCaT tend to be diluted due to the presence of a non-stellar component, in agreement with the unification paradigm. (4) A comparison of stellar and gas velocity dispersions confirms the existence of a correlation between the typical velocities of stars and clouds of the Narrow Line Region. The strength and scatter around this correlation are similar to those previously obtained from the [OIII]5007 line width.Comment: 14 pages, 15 figures. Paper accepted for publication in MNRA

Diseño de teselas con curvas de forma libre

[ES] Sin resumenMárquez García, ML.; Delgado Olmos, ÁH. (2009). Diseño de teselas con curvas de forma libre. EGA. Revista de Expresión Gráfica Arquitectónica. (14):238-245. https://doi.org/10.4995/ega.2009.10261SWORD23824514ALSINA, C. et Alter,; Simetría Dinámica. Síntesis Editorial. Madrid 1989.BIRGEN, i.; Hyperbolic Geometry. University Press Editorial, Cambridge 1992.DELGADO OLMOS, a.: Modelado de superficies polinomiales y su aplicación a la técnica. Tesis Doctoral. Universidad de Granada 1995.DELGADO OLMOS, a. & Cosos GUTIERREZ, c.; Modelado de superficies polinomiales que pasan por una red de puntos fijo, Jaén (España) VIII Congreso Internacional de Expresión Gráfica Arquitectónica, Servicio de Publicaciones de la Universidad de Jaén .1996. ISBN: 84-88942-71-0.DELGADO OLMOS, a. & MARQUEZ GARCÍA, l.; El modelado en escultura, arquitectura e ingeniería. Posibilidades que ofrecen los nuevos algoritmos desarrollados con ordenador, Salamanca (España) Congreso Internacional: La ciencia ante el público. Cultura humanista y desarrollo científico tecnológico, Instituto Universitario de Estudios de la Ciencia y la Tecnología .2002. ISBN: 84-688-2676-6.DELGADO OLMOS. a.; Elementos autoencajables. Diseño y uso, Málaga (España) X Congreso Internacional de Ingeniería Gráfica, Departamento de Expresión Gráfica, Diseño y Proyecto .1998. ISBN: 84-89791-04-X.DELGADO OLM0S, a. & MÁRQUEZ GARCÍA, l.; Lengthening, expansion and torsión: three geometric operations for aesthetics creation, Granada (España) Meeting Alhambra. The lnternational Socíety of the Arts, Mathematics and Architecture. 2002.DEGEORGE, g.-; Tiles and tilework of Europe/ Alun Graves. London: V&A Publications. 2002.DEGEORGE, g-; The art of the lslamic tile/ Gerard Degeorge, Yves Porter, Paris : Flammarion, c2002.BOHM, w.; Geometrics Concepts for Geometric Design A.K Peters, Wellesley, Massachusetts.1994.CORDERO VALLE, j.m.& CORTÉS PAREJO, j: Curvas y Superficies para Modelado Geométrico. RA-MA Editorial, Madrid 2002.FABER, richard l.; Foundations of Euclidean and Non-Euclidean Geometry Geométrico. board Editorial. New Yord 1983.FARIN. g: curves and surfaces for computer aided geometric design. Academic Press, INC.1988.WILHELM; magnus; Noneuclidean Tesslations and Their Groups. Academic Press Editorial, New York 1974

The Bulgeless Seyfert/LINER Galaxy NGC 3367: Disk, Bar, Lopsidedness and Environment

NGC3367 is a nearby isolated active galaxy that shows a radio jet, a strong bar and evidence of lopsidedness. We present a quantitative analysis of the stellar and gaseous structure of the galaxy disk and a search for evidence of recent interaction based on new UBVRI Halpha and JHK images and on archival Halpha Fabry-Perot and HI VLA data. From a coupled 1D/2D GALFIT bulge/bar/disk decomposition an (B/D ~ 0.07-0.1) exponential pseudobulge is inferred in all the observed bands. A NIR estimate of the bar strength = 0.44 places NGC 3367 bar among the strongest ones. The asymmetry properties were studied using (1) optical and NIR CAS indexes (2) the stellar (NIR) and gaseous (Halpha, HI) A_1 Fourier mode amplitudes and (3) the HI integrated profile and HI mean intensity distribution. While the average stellar component shows asymmetry values close to the average found in the Local Universe for isolated galaxies, the young stellar component and gas values are largely decoupled showing significantly larger A_1 mode amplitudes suggesting that the gas has been recently perturbed. Our search for (1) faint stellar structures in the outer regions (up to u_R ~ 26 mag arcsec^{-2}), (2) (Halpha) star-forming satellite galaxies and (3) regions with different colors (stellar populations) along the disk all failed. Such an absence is interpreted using recent numerical simulations to constrain a tidal event with an LMC like galaxy to some dynamical times in the past or to a current very low mass, gas rich accretion. We conclude that a cold accretion mode (gas and small/dark galaxies) may be responsible of the nuclear activity and peculiar (young stars and gas) morphology regardless of the highly isolated environment. Black hole growth in bulgeless galaxies may be triggered by cosmic smooth mass accretion.Comment: 27 pages, 12 figures, accepted for publication in The Astronomical Journa

Eliminating Error in the Chemical Abundance Scale for Extragalactic HII Regions

In an attempt to remove the systematic errors which have plagued the calibration of the HII region abundance sequence, we have theoretically modeled the extragalactic HII region sequence. We then used the theoretical spectra so generated in a double blind experiment to recover the chemical abundances using both the classical electron temperature + ionization correction factor technique, and the technique which depends on the use of strong emission lines (SELs) in the nebular spectrum to estimate the abundance of oxygen. We find a number of systematic trends, and we provide correction formulae which should remove systematic errors in the electron temperature + ionization correction factor technique. We also provide a critical evaluation of the various semi-empirical SEL techniques. Finally, we offer a scheme which should help to eliminate systematic errors in the SEL-derived chemical abundance scale for extragalactic HII regions.Comment: 24 pages, 9 Tables, 13 figures, accepted for publication in MNRAS. Updated considering minor changes during the final edition process and some few missing reference