Tensorial perturbations in the bulk of inflating brane worlds

In this paper we consider the stability of some inflating brane-world models in quantum cosmology. It is shown that whereas the singular model based on the construction of inflating branes from Euclidean five-dimensional anti-de Sitter space is unstable to tensorial cosmological perturbations in the bulk, the nonsingular model which uses a five-dimensional asymptotically anti-de Sitter wormhole to construct the inflating branes is stable to these perturbations.Comment: 4 pages, RevTex, to appear in Phys. Rev.

PEDESTRIAN PATHFINDING in URBAN ENVIRONMENTS: PRELIMINARY RESULTS

With the rise of urban population, many initiatives are focused upon the smart city concept, in which mobility of citizens arises as one of the main components. Updated and detailed spatial information of outdoor environments is needed to accurate path planning for pedestrians, especially for people with reduced mobility, in which physical barriers should be considered. This work presents a methodology to use point clouds to direct path planning. The starting point is a classified point cloud in which ground elements have been previously classified as roads, sidewalks, crosswalks, curbs and stairs. The remaining points compose the obstacle class. The methodology starts by individualizing ground elements and simplifying them into representative points, which are used as nodes in the graph creation. The region of influence of obstacles is used to refine the graph. Edges of the graph are weighted according to distance between nodes and according to their accessibility for wheelchairs. As a result, we obtain a very accurate graph representing the as-built environment. The methodology has been tested in a couple of real case studies and Dijkstra algorithm was used to pathfinding. The resulting paths represent the optimal according to motor skills and safety

Paleovegetación durante la Edad del Bronce en la Rioja alavesa: Análisis palinológico del yacimiento de Peña Parda ( Laguardia, Álava)

En este trabajo se presenta el estudio palinológico del yacimiento de Peña Parda (Laguardia, Álava). Los resultados obtenidos, en las 13 muestras estudiadas, han aportado interesantes datos sobre el paisaje vegetal existente en la vertiente sur de la Sierra de Cantabria durante la Edad del Bronce, así como sobre las evidencias de antropización

Genomic Evolution of Two Acinetobacter baumannii Clinical Strains from ST-2 Clones Isolated in 2000 and 2010 (ST-2_clon_2000 and ST-2_clon_2010)

Acinetobacter baumannii is a successful nosocomial pathogen due to its ability to persist in hospital environments by acquiring mobile elements such as transposons, plasmids, and phages. In this study, we compared two genomes of A. baumannii clinical strains isolated in 2000 (ST-2_clon_2000) and 2010 (ST-2_clon_2010) from GenBank project PRJNA308422

Heterologous expression of AtNPR1 gene in olive for increasing fungal tolerance

The NPR1 gene encodes a key component of SAR signaling mediated by salicylic acid (SA). After a pathogen infection, the accumulation of SA releases NPR1 monomers in the cytosol that are translocated to the nucleus, activating the expression of pathogenesis-related (PR) genes. Overexpression of NPR1 has conferred resistance to fungal, viral and bacterial pathogens in several plant species. The aim of this research was to generate transgenic olive plants expressing the gene AtNPR1 from Arabidopsis thaliana to obtain material resistant to fungal pathogens. Three transgenic lines expressing AtNPR1 gene under the control of the constitutive promoter CaMV35S were obtained following the protocol of Torreblanca et al. (2010), using an embryogenic line derived from a seed of cv. Picual. Level of AtNPR1 expression in transgenic calli varied greatly among the different lines, being higher in the line NPR1-780. The elicitation of embryogenic calli in liquid medium with AS did not increase endochitinase activity, a PR protein. However, jasmonic acid induced a transient increase in chitinase activity after 24 h of treatment in all the lines, being the increment higher in transgenic NPR1 than in control. After maturation and germination of transgenic somatic embryos, plants were micropropagated and acclimated to ex vitro conditions. The expression of AtNPR1 did not alter the growth of transgenic plants neither in vitro nor in the greenhouse. Experiments are in progress to determine the resistance of transgenic AtNPR1 plants to V. dalihae and R. necatrix.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. Research projects: Plan Nacional AGL2014-52518-C2-1-R; AGL2017-83368-C2-1-R and Junta de Andalucía P11-AGR799

Características acústicas de las vocales del español de Chile producidas por sujetos residentes en la ciudad de Santiago

The aim of this study was, firstly, to describe the acoustic characteristics of isolated vowels produced by Chilean young people from Santiago, Chile, secondly, to compare the results obtained between men and women and, finally, to compare the data with information collected from Argentinian speakers (Rio de la Plata) and Chilean speakers (Concepción). 117 university students were selected for this study. Neither vocal nor auditory pathologies were found in the participants. Vowels produced by the participants were registered in isolation and they were analyzed using the software PRAAT. In general, the comparison shows that women from Santiago produce higher frequency than men in the analyzed formants (F0, F2, F3 y F4), except in F1. It was also observed that women and men from Santiago show a higher F0 formant than speakers from Rio de la Plata. Finally, no differences were found between speakers from Santiago and speakers from Concepción. In each comparison, a detailed description of the vowel formants is also presented.El presente estudio tuvo por objetivos describir las características acústicas de las vocales aisladas en jóvenes chilenos residentes en Santiago, comparar en ellos los resultados obtenidos para hombres y mujeres y también realizar una comparación con datos de hablantes en Río de la Plata (Argentina) y de Concepción (Chile). Se seleccionó una muestra de 117 estudiantes universitarios en quienes se descartó patología vocal y auditiva. Se registraron las voces de los sujetos produciendo las vocales aisladas y, posteriormente, se analizaron sus registros vocales con el software PRAAT. En general, en las comparaciones se advierte que en los sujetos de Santiago las mujeres presentan mayor frecuencia que los hombres en los formantes analizados (F0, F2, F3 y F4) excepto en F1. A su vez, las mujeres y hombres de Santiago evidencian una F0 mayor que sus pares rioplatenses. Por último, no se advierten diferencias importantes en la comparación con hablantes de Concepción. En cada comparación, se comentan también en forma detallada los formantes de cada una de las vocales

Bóvedas por arista de paraboloides hiperbólicos asimétricos

The shell groin vaults constructed in previous decades were based on the same principles as old stone and brick groin vaults; that are to say, with identical symmetrical foils. By introducing asymmetries in the shape of the foils, the traditional design can be improved, thus opening up a new realm of formal and spatial possibilities wich allow us to recover and renew this old architectural tradition. The shell constructions wich are described in this article are founded on this idea.Las bóvedas por arista laminares que se construyeron en décadas anteriores fueron concebidas sobre los mismos principios que las viejas bóvedas por arista de piedra y ladrillo, es decir, con lóbulos simétricos e iguales entre sí. Introduciendo asimetrías en la forma de los lóbulos puede superarse el esquema tradicional, abriéndose un nuevo campo de posibilidades formales y espaciales que permite recuperar y renovar esta vieja tradición arquitectónica. Las construcciones laminares que se muestran en el presente artículo están fundadas en esta idea

Bóvedas por arista de paraboloides hiperbólicos asimétricos

The shell groin vaults constructed in previous decades were based on the same principles as old stone and brick groin vaults; that are to say, with identical symmetrical foils. By introducing asymmetries in the shape of the foils, the traditional design can be improved, thus opening up a new realm of formal and spatial possibilities wich allow us to recover and renew this old architectural tradition. The shell constructions wich are described in this article are founded on this idea.Las bóvedas por arista laminares que se construyeron en décadas anteriores fueron concebidas sobre los mismos principios que las viejas bóvedas por arista de piedra y ladrillo, es decir, con lóbulos simétricos e iguales entre sí. Introduciendo asimetrías en la forma de los lóbulos puede superarse el esquema tradicional, abriéndose un nuevo campo de posibilidades formales y espaciales que permite recuperar y renovar esta vieja tradición arquitectónica. Las construcciones laminares que se muestran en el presente artículo están fundadas en esta idea