Truncation symmetry type graphs

There are operations that transform a map M (an embedding of a graph on a surface) into another map in the same surface, modifying its structure and consequently its set of flags F(M). For instance, by truncating all the vertices of a map M, each flag in F(M) is divided into three flags of the truncated map. Orbanic, Pellicer and Weiss studied the truncation of k-orbit maps for k < 4. They introduced the notion of T-compatible maps in order to give a necessary condition for a truncation of a k-orbit map to be either k-, 3k/2- or 3k-orbit map. Using a similar notion, by introducing an appropriate partition on the set of flags of the maps, we extend the results on truncation of k-orbit maps for k < 8 and k=9

The Rank of the Covariance Matrix of an Evanescent Field

Evanescent random fields arise as a component of the 2-D Wold decomposition of homogenous random fields. Besides their theoretical importance, evanescent random fields have a number of practical applications, such as in modeling the observed signal in the space time adaptive processing (STAP) of airborne radar data. In this paper we derive an expression for the rank of the low-rank covariance matrix of a finite dimension sample from an evanescent random field. It is shown that the rank of this covariance matrix is completely determined by the evanescent field spectral support parameters, alone. Thus, the problem of estimating the rank lends itself to a solution that avoids the need to estimate the rank from the sample covariance matrix. We show that this result can be immediately applied to considerably simplify the estimation of the rank of the interference covariance matrix in the STAP problem

Latent curing of epoxy-thiol thermosets

Epoxy-thiol curing is a click reaction which allows quantitative yield of the end products. The base-catalyzed reaction is rapid at low temperatures so it is most often desirable to harness reactivity by using latent catalysts. In this work, we used triazabicyclodecene tetraphenylborate (TBD·HBPh4) as a photobase generator (PB). We activated the PB either thermally or by UV light and monitored reaction kinetics by DSC and FTIR methods. Depending on the catalytic system used, the rate of the thiol-epoxy reaction was ordered as follows: Neat base > UV activated PB > thermally activated PB > uncatalyzed system. A series of isothermal and non-isothermal DSC experiments were run on non-irradiated and irradiated samples in order to study the effect of PB content and UV irradiation duration on PB activation efficiency and latency/storage stability. The data from DSC were analyzed using model-free linear isoconversional methods to estimate kinetic parameters such as activation energies. In addition, the kinetics data for both activation methods were shown to be accurately represented by multi-term Kamal models. The storage stability of the systems were studied at room temperature and was shown to fit well to the predictions of the kinetic model.Postprint (author's final draft

Evaluación de la calidad de programas de detección precoz de hipoacusia neonatal. Revision bibliográfica

La audición es la vía habitual de adquisición del lenguaje por lo que su mal funcionamiento interferirá negativamente en la esfera social del niño. Hay evidencia científica que remarca la importancia de una identificación y diagnóstico precoz, antes de los 6 meses, para conseguir resultados más favorables en la adquisición del lenguaje. En los últimos años se han ido instaurando programas de cribado auditivo neonatal con el objetivo de prevenir factores de riesgo predisponentes a desarrollar esta patología, detectar precozmente estos déficits de audición e instaurar lo antes posible un tratamiento. El objetivo de este trabajo es conocer la situación actual de los programas de cribado de hipoacusia neonatal en diferentes hospitales, en cuanto a la calidad. Se ha realizado una revisión bibliográfica de literatura publicada sobre este tema en los últimos cinco años. Con este fin, se han consultado diferentes bases de datos de ciencias de la salud. Para garantizar buenos resultados de estos programas se utilizan una serie de indicadores de calidad. Las publicaciones más recientes toman como referencia los principios publicados en el 2007 por el JCIH (Joint Committee On Infant Hearing). Sin embargo, muchos de los programas estudiados muestran carencias en cuanto a la calidad recomendada encontrándose diferencias significativas dependiendo de los países analizados. Los aspectos con mayores deficiencias fueron los relativos a la cobertura de los programas y a los tiempos de realización del cribado siendo el factor más prevalente en el incumplimiento del cribado la pérdida de seguimiento de los casos.Departamento de EnfermeríaGrado en Enfermerí

Técnicas de relajación en el aula: Propuesta teórica para desarrollar el autocontrol

En este apartado me gustaría dar las gracias a mis tutores Serafín Aldea y Jesús Bachiller, por toda la ayuda que me han prestado, su rápida disponibilidad, su comprensión, su atención y su paciencia. Gracias por todas las aportaciones, ideas y consejos con los que he podido realizar este trabajo. Gracias a las dos tutoras que tuve durante los períodos de prácticas Milagros Parrilla y Mª Esther Ruíz, por todo lo aprendido durante el practicum I y practicum II, y que he podido tener en cuenta a la hora de realizar el Trabajo Fin de Grado. Sin vuestra ayuda no me habría sido posible llevarlo a cabo. Muchas gracias.Grado en Educación Infanti

Medial symmetry type graphs

A $k$-orbit map is a map with its automorphism group partitioning the set of flags into $k$ orbits. Recently $k$-orbit maps were studied by Orbani\' c, Pellicer and Weiss, for $k \leq 4$. In this paper we use symmetry type graphs to extend such study and classify all the types of $5$-orbit maps, as well as all self-dual, properly and improperly, symmetry type of $k$-orbit maps with $k\leq 7$. Moreover, we determine, for small values of $k$, all types of $k$-orbits maps that are medial maps. Self-dualities constitute an important tool in this quest

New understanding of the shape-memory response in thiol-epoxy click systems: towards controlling the recovery process

Our research group has recently found excellent shape-memory response in “thiol-epoxy” thermosets obtained with click-chemistry. In this study, we use their well-designed, homogeneous and tailorable network structures to investigate parameters for better control of the shape-recovery process. We present a new methodology to analyse the shape-recovery process, enabling easy and efficient comparison of shape-memory experiments on the programming conditions. Shape-memory experiments at different programming conditions have been carried out to that end. Additionally, the programming process has been extensively analysed in uniaxial tensile experiments at different shape-memory testing temperatures. The results showed that the shape-memory response for a specific operational design can be optimized by choosing the correct programming conditions and accurately designing the network structure. When programming at a high temperature (T » Tg), under high network mobility conditions, high shape-recovery ratios and homogeneous shape-recovery processes are obtained for the network structure and the programmed strain level (eD). However, considerably lower stress and strain levels can be achieved. Meanwhile, when programming at temperatures lower than Tg, considerably higher stress and strain levels are attained but under low network mobility conditions. The shape-recovery process heavily depends on both the network structure and eD. Network relaxation occurs during the loading stage, resulting in a noticeable decrease in the shape-recovery rate as eD increases. Moreover, at a certain level of strain, permanent and non-recoverable deformations may occur, impeding the completion and modifying the whole path of the shape-recovery process.Postprint (author's final draft