La influencia de los videojuegos de contenido apocalíptico en los adolescentes

The aim of this study is the dissertation and analysis of the influence (sociological, psychological and cultural) exerted on adolescents by the concept of Apocalypse. Become a key thought of visual culture, the called doomsday theory achieves one of its highest expressions in video games, possibly the favorite entertainment for young people in their leisure time. The results obtained in this research represent a first approach to the subject through the selected samples, two secondary schools from the city of Seville with disparate locations and divergent socioeconomic backgrounds. To reinforce the comparative study, we have included issues related to parental control, principal gaming platforms used by respondents or the number of hours dedicated to this type of entertainment. The conclusions demonstrate an irremediable attraction from our youth towards apocalyptic universes, plotter consciously with leisure and entertainment as escape from their routine of everyday life.El objetivo del presente trabajo es la disertación y el análisis de la influencia (sociológica, psicológica y cultural) que ejerce en los adolescentes el concepto de Apocalipsis. Convertido en una noción clave de la cultura visual, la denominada teoría del fin del mundo alcanza una de sus mayores expresiones en los videojuegos, posiblemente el divertimento preferido por los jóvenes en sus ratos de ocio. Los resultados obtenidos en esta investigación suponen un primer acercamiento a la materia a través de las muestras seleccionadas, dos institutos de la ciudad de Sevilla con localizaciones dispares y situaciones socioeconómicas divergentes. Para fortalecer el estudio comparativo se han incluido cuestiones vinculadas con el control parental, las principales plataformas de juego utilizadas por los encuestados o el número de horas de dedicación a este tipo de entretenimientos. Las conclusiones demuestran una irremediable atracción de nuestros jóvenes hacia universos apocalípticos, urdidos de manera inconsciente con el ocio y el entretenimiento como vías de escape de su cotidianidad

Optical and Chemical Response of Nanostructured Films

When illuminated with visible light, nanostructured noble metals exhibit a strongplasmon resonance at wavelength, p, that has been shown to be sensitive to its size,structure, the dielectric properties of the surrounding medium, and charge density. Thetunability of the plasmon resonance has allowed metal nanosystems to be fabricated withresonances matching the solar spectrum for us in plasmon promoted catalysis, plasmonicphotovoltaics, and surface-enhanced raman spectroscopy. Here we use UV-Visible spectroscopyto track the shifts of the plasmon resonances from an array of gold nanoparticlesburied under metal oxide layers of varying thickness when in contact with one of two bulkmetals: aluminum or silver. By assuming the array of gold nanoparticles and metal-oxidelayers to be an optically homogenous lm of core-shell particles on a substrate, we developeda Maxwell-Garnett effective medium approximation to extract reliable opticalparameters for the gold nanoparticles, yielding their charge state before and after contactwith the bulk metal.Based on the optical parameters extracted from our model, we nd the magnitude ofcharge transfer from the bulk metal to the gold nanoparticle is independent of the workfunction of the bulk metal. Furthermore, when gold is used as the bulk layer in contactwith the gold nanoparticles, we measured an appreciable amount of charge transfer to thegold nanoparticles, failing to support the well-established model for electrostatic contactelectrication. Instead, we attribute the charge transfer to the so called plasmoelectriceffect, an optically induced charge transfer mechanism, in which the gold nanoparticlemodifes its charge density to allow its resonant wavelength to match that of the incidentlight. We show, however, that in our devices the Schottky barriers between the metalsand the metal oxide layers create a rectication effect that favors electron transfer fromthe bulk metal to the nanoparticles over the reverse effect

Understanding organic materials performance in field-effect transistors

Comunicación oralIn the last years, much of our effort has been devoted to the search and study of new high-mobility semiconductors for organic thin film transistors. The approach used for the materials design has been two-fold: (i) the combination of donor and acceptor moieties in the pi-conjugated skeleton, which allows fine tuning of the frontier molecular orbitals, being this necessary for achieving electron/hole or ambipolar transport and ambient stability; and (ii) rational selection of the type and positioning of specific solubilizing substituents ensuring processability, which is essential to make these materials scalable to industry. However, material processability should be attained minimizing a negative effect on charge transport. Therefore, proper energy levels, planar molecular conformations, close intermolecular pi-pi stacking and adequate thin film crystallinity need to be maintained upon alkyl substitution. In this communication, several examples of molecular and polymeric materials are shown. A rational design, guided by experimental and theoretical evidences, has prompted modifications on their conjugated skeletons, donor/acceptor subunits ratio and/or selection of proper alkyl solubilizing chains, which induce noticeable changes in their electronic performances. The main aim of these studies is the basic understanding of charge transport in organic materials. For this end, we will use Raman spectroscopy and DFT quantum-chemical calculations as important tools for materials characterization.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech

Gastropod Larvae and Zooplankton in Reef-Related Areas of the Western Caribbean Sea

In order to estimate the composition, distribution and abundance of zooplankton in 3 areas off the western Caribbean, samples were collected in 15 stations at South Coast and Chinchorro Bank, Mexico, and Hol-Chan Belize, from April to December 1996. Duplicate samples (2.5 m3) were collected bimonthly using a submersible pump. The pumped water was filtered through a 202 μm mesh net yielding a total of 20 zooplankton groups. Chinchorro Bank had 19 groups, South Coast had 15 groups, and Hol-Chan had 14 groups. The most abundant groups were copepods (43.1%), fish eggs (29.0%), foraminifera (12.0%), decapod larvae (5.7%) and gastropod larvae (4.3%). Twenty-seven species of gastropod larvae were identified with Natica sp. 1, Rissoina sp. 1, Cerithiopsis hero, Cerithium atratum, and Epitonium sp.1 being dominant. Newly hatched veligers of Strombus gigas were collected only at Chinchorro Bank (5.7/10m-3). Zooplankton was diverse and showed marked changes during the sampling months. Chinchorro Bank had a higher number of marine zooplankters than South Coast and Hol-Chan, and this may be related to a greater oceanic influence. In spite of the environmental homogeneity, there were differences in the distribution and abundance of Strombus veligers, and this might be related to some water characteristics locally, affecting gastropod reproduction mainly in South Coast and Hol-Chan

THE SCARAB BEETLES (COLEOPTERA : SCARABAEIDAE) OF PARQUE BICENTENARIO, EL SALVADOR

Parque Bicentenario in the Area Natural Protegida El Espino-Bosque Los Pericos, considered the "last green lung of San Salvador", is the most important forested area in central El Salvador. We performed a survey to provide the first inventory of scarab beetles (Scarabaeidae) of the park. Collections were conducted monthly for one year (August 2018-July 2019) by using baited pitfall, aerial, and ultraviolet light traps. Four subfamilies, nine tribes, 14 genera, 20 species (8% of the total richness of the family in El Salvador), and 1,584 individuals were captured. The most abundantly collected species in the park were the scarabaeines Onthophagus batesi Howden and Cartwright, Onthophagus belorhinus (Bates), Dichotomius centralis (Harold), Coprophanaeus corythus (Harold), Dichotomius yucatanus (Bates), and Coprophanaeus boucardi (Nevinson).Peer reviewe

Fondos Revolventes Comunitarios (FRC) impulsados por ADDAC, como alternativa socioeconómica para el Desarrollo Rural desde un enfoque de Género, en las comunidades de Yahoska y Achiote Arriba del municipio de Rancho Grande, 2013

La Asociación para la Diversificación y el Desarrollo Agrícola Comunal (ADDAC) es el principal impulsador de los fondos revolventes en las zonas del norte de Nicaragua, uno de ellos es en la comunidad de Yahoska y Achiote Arriba del Municipio de Rancho Grande. A partir de la presente problemática presentada por la misma institución (ADDAC) surge la idea de realizar un análisis de los fondos revolventes comunitarios, a través del funcionamiento y los aportes en el Desarrollo Rural con enfoque de género desde lo Humano y Comunitario en las dos comunidades de estudio. Como metodología aplicada, se utilizó un tipo de investigación descriptiva; con un enfoque cualitativo y los métodos aplicados son el teórico con información secundaria y el empírico con la aplicación de los instrumentos como la entrevista grupal y entrevistas. Los resultados fueron notables en el funcionamiento, Desarrollo Comunitario y Humano resaltando más en la comunidad de Yahoska debido a que hay mejores relaciones personales entre los hombres y mujeres, como también beneficios comunitarios y participación, sin dejar atrás los otros elementos que fueron estudiados como la organización, valores/principios, subsistencia, afecto, protección, etc. El fondo revolvente comunitario de la comunidad de Achiote Arriba ha aportado en el desarrollo humano y comunitario pero no tan relevante como en la comunidad de Yahoska. Se recomienda a ADDAC que siga proporcionando financiamiento a través de los fondos revolventes, pero con un mayor seguimiento y que los socios se apropien, que tengan más compromiso y responsabilidad con el fondo revolvente comunitari

Purely parabolic discrete subgroups of \PSL(3, \Bbb{C})

While for \PSL(2,\C) every purely parabolic subgroup is Abelian and acts on $\P^1$ with limit set a single point, the case of \PSL(3,\C) is far more subtle and intriguing. We show that there are twelve classes of purely parabolic discrete groups in \PSL(3,\C), and we classify them. We use first the Tits Alternative and Borel's fixed point theorem to show that all purely parabolic discrete groups in \PSL(3,\C) are virtually triangularizable; this extends a Theorem by Lie-Kolchin. Then we prove that purely parabolic groups in \PSL(3,\C) are virtually solvable and cocyclic, hence finitely presented. We then prove a Tits-inspired alternative for these groups: they are either virtually unipotent or else Abelian of rank 2 and of a very special type. All the virtually unipotent ones turn out to be conjugate to subgroups of the Heisenberg group {\rm Heis}(3,\C). We classify these using the obstructor dimension introduced by Bestvina, Kapovich and Kleiner. We find that their Kulkarni limit set is either a projective line, a cone of lines with base an Euclidean circle, or else the whole $\P^2$. We determine its relation with the Conze-Givarc'h limit set of the action on the dual projective space \dP^2. We show that in all cases the Kulkarni region of discontinuity is the largest open set where the group acts properly discontinuously, and that in all cases but one, this set coincides with the equicontinuity region.Comment: Minor chances in the new versio

Conocimiento general sobre neurociencias en estudiantes de décimo ciclo de dos instituciones de formación inicial docente de Lima e Ica, 2021

La presente investigación tuvo como objetivo principal comparar el conocimiento general sobre neurociencias entre los estudiantes de décimo ciclo de dos Instituciones de formación inicial docente (IFID) de Lima e Ica. Este estudio presenta un enfoque cuantitativo, es de tipo básica, con diseño no experimental, de corte transversal y nivel descriptivo comparativo. La población estuvo conformada por un total de 175 participantes. La técnica empleada para la recolección de datos fue la encuesta y el instrumento de recolección de datos fue el cuestionario titulado “Test para medir el conocimiento general sobre neurociencias” que presenta 32 ítems divididos en 2 dimensiones. Los datos recopilados fueron sometidos a la prueba Chi cuadrado de homogeneidad obteniendo un valor de 2 = 84.900, siendo su valor calculado = 0.000 y que al ser menor de 0.05, se concluyó que existen diferencias significativas respecto al conocimiento general sobre neurociencias entre los estudiantes de décimo ciclo de dos Instituciones de formación inicial docente (IFID) de Lima e Ica. Como resultados complementarios también se observó que un 22.86% (40) de la población total presenta un nivel bajo de conocimiento general sobre neurociencias, un 68.57% (120) obtuvo un nivel intermedio y un 8.57% (15) alcanzó un nivel alto