Quasinormal modes of the Schwarzchild black hole with a deficit solid angle and quintessence-like matter: Scalar and electromagnetic perturbations

We study the quasinormal modes (QNM) for scalar, and electromagnetic perturbations in the Schwarzchild black hole with a deficit solid angle and quintessence-like matter. Using the sixth--order WKB approximation and the improved asymptotic iteration method (AIM) we can determine the dependence of the quasinormal modes on the parameters of the black hole and the parameters on the test fields. The values of the real part and imaginary parts of the quasi--normal modes increase with the decrease of the values of the deficit solid angle and density of quintessence-like matter. The quasinormal modes gotten by these two methods are in good agreement. Using the finite difference method, we obtain the time evolution profile of such perturbations in this Black Hole

Effects of quintessence on scattering and absorption sections of black holes

Basing on the ideas used by Kiselev, we study three black holes surrounded by quintessence and the effects of quintessence on the classical and semiclassical scattering cross-sections. In contrast, the absorption section is studied with the sinc approximation in the eikonal limit. For Schwarzschild, Reissner-Nordstr\"{o}m and Bardeen black holes surrounded by quintessence, the values critical of charges and the normalization factor are obtained. We also described the horizons and the extremal condition of the black holes surrounded by quintessence. By setting for the quintessence state parameter in two the particular cases w=-2/3 and w=-1/2

Simulation of Axisymmetric Flows with Swirl in Vorticity- Stream Function Variables Using the Lattice Boltzmann Method

In the present work, a Lattice Boltzmann formulation in vorticity-stream function variables is proposed for axisymmetric flows with swirl. For this purpose, several source terms are proposed and implemented. Although containing velocity gradients, these sources are in the Lattice Boltzmann framework and fulfill the Euler and Navier-Stokes equations in their conservative form. The main characteristics of the proposed method are: First, the momentum equation is solved using a unified Lattice Boltzmann solver; second, the proposed sources are consistent with the nonviscous and viscous momentum equations; and third, the implemented method is second-order accurate in space. Numerical tests on the Taylor-Couette flow with finite aspect ratio of 3.8 and the lid-driven cylindrical cavity flow were carried out showing good agreement with numerical and experimental results found in the literature, evidencing the ability of the implemented method to solve axisymmetric flows with swirl. In the case of the lid-driven cylindrical cavity flow, the implemented method is able to correctly reproduce some qualitative characteristics of this flow such as the vortex breakdown close to the cavity axis at different Reynolds numbers and cavity aspect ratio

Aplicación nativa de aula global para iPad

Este proyecto consistirá en el análisis y diseño de una aplicación de Aula Global, la plataforma docente de la Universidad Carlos III de Madrid, para dispositivos Apple iPad (Air, Mini o normal), que deberá ser capaz de realizar las siguientes tareas o funciones: Acceso a la aplicación empleando el mismo usuario y contraseña que en Aula Global y realizando una validación en el servidor. Acceso a los cursos en los que se encuentre matriculado el usuario. Además podrán marcarse como favoritos para facilitar su acceso desde la sección de favoritos en la que se incluirán todos los cursos previamente marcados por el usuario. En cada curso se podrán visualizar todos los documentos, vídeos, audios, enlaces y tareas incluidos en él. No habrá posibilidad de realizar las tareas del curso, mostrándose un resumen con el estado de la tarea y su calificación (en el caso de estar ya corregida). Los usuarios con permisos suficientes (principalmente profesores) serán capaces de ocultar, renombrar o eliminar recursos de cada curso. Se tendrá acceso a los próximos eventos del usuario en el cual se reflejan todas las actividades que tenga anotadas en la plataforma. Estas actividades podrán ser añadidas al calendario del dispositivo. Una sección dará acceso a todos los foros en los que el usuario esté incluido, pudiendo leer y comentar todos los posts que en ellos se encuentren. El usuario recibirá notificaciones push cada vez que haya nuevos comentarios en todos aquellos temas a los cuales esté suscrito. Todas estas funciones serán realizadas gracias al conjunto de servicios web que proporciona Moodle (plataforma en la cual está basada Aula Global), que permitirá que la consistencia de datos entre el servidor y la aplicación sea perfecta e instantánea y cualquier cambio realizado en la web se vea reflejado en la aplicación móvil y viceversa.This senior design project is about analyzing and designing a mobile app, based on any kind of Apple iPad device, for Aula Global, the Universidad Carlos III de Madrid learning platform. That app should have at least the following features: Log into the app using the same user and password as Aula Global by performing a validation with the server. Access to user courses. There will be also a favorites section that will give the user the chance to select courses and access to them easily. All the documents, videos, audios, links and tasks included in a course will be available in the app. However, it won’t be possible to complete the course tasks, showing just a summary showing its status and score if it’s already corrected. Some users with special permissions (mainly teachers) will be able to hide, rename or remove resources from a course. The user will have the chance to see his/her next events planned on the platform. It will be possible to synchronize these events with the device calendar. A section containing all the forums where the user is taking part, giving the chance to read and reply to all the posts included in those forums. The user will receive a push notification each time that a theme subscribed by the user is replied. All these features will be accomplished thanks to the web services provided by Moodle (the open source learning platform on which Aula Global is based), allowing a real persistency between server and app data. In this way, each change done in the web tool will be reflected in the app and vice versa.Ingeniería Técnica en Informática de Gestió

EL ESPACIO GEOGRAFICO Y LA PLANIFICACION ESPACIAL

El concepto de espacio, que hasta hace algunas décadas evocaba sólo unconcepto geométrico, complementado inmediatamente con términos como«euclidiano», «isotrópico» o «infinito», y que dependía sólo de la matemática; seaborda hoy desde diferentes puntos de vista y ramas del conocimiento hasta llegara ser «banal» como lo dice Francois Perroux. ¿Quién de nosotros, a lo largo denuestra vida académica no ha escuchado mencionar la palabra espacio, perodefinida como un Sustantivo? En estas condiciones se habla del espacio temporalde los historiadores, el espacio económico de los economistas, o el espacio socialtan de moda; y de nuestro espacio: el espacio geográfico

Diplomado de profundización CISCO (Diseño e implementación de soluciones integradas LAN / WAN).

La temática desarrollada en el transcurso de la carrera de ingeniería de sistemas , el diplomado de profundización en CISCO y la solución a los escenarios propuestos en la guía de actividades , me ayudo a fortalecerme al momento de realizar una instalación de dispositivos, configuración de una red local o empresarial , administrar las distintas redes que en el futuro se puedan presentar y aún más significativo la manera de atesorar cada uno de los problemas en redes pequeñas y empresariales como por ejemplo LAN y WAN, durante el desarrollo del trabajo en conjunto apoyado firmemente por profesionales y especialistas del área, con el fin de optimizar cada una de las destrezas adquiridas y de trabajar modo autónomo en el esquema de redes. Esta actividad logro afianzar mis conocimientos sobre protocolos de enrutamiento avanzados como IGRP, RIP, OSPF, se utilizó tanto el direccionamiento IPV4 e IPV6, con ellos se enfatizó en la seguridad. Una temática que es suma importancia la cual día a día es importante a momento del diseño de una red. El presente trabajo validad estas habilidades y nos da una visión más clara de lo que nos enfrentaremos, conjuntamente es la manera de evaluar nuestros conocimientos obtenidos durante el desarrollo de las unidades que forman el curso, así como la formación autónoma que el diplomado tiene como requerimiento.The theme developed in the course of the systems engineering career, the diploma of deepening in CISCO and the solution to the scenarios proposed in the activity guide, helped me to strengthen myself when performing a device installation, configuration of a network local or business, manage the different networks that may arise in the future and even more significant how to treasure each of the problems in small and business networks such as LAN and WAN, during the development of joint work strongly supported by professionals and specialists in the area, in order to optimize each of the acquired skills and work independently in the network scheme. This activity was able to strengthen my knowledge about advanced routing protocols such as IGRP, RIP, OSPF, IPV4 and IPV6 addressing was used, with them security was emphasized. A theme that is very important which day by day is important when designing a network. The present work validates these skills and gives us a clearer vision of what we will face, together it is the way to evaluate our knowledge obtained during the development of the units that form the course, as well as the autonomous training that the diploma has as a requirement

Estudio del estado del arte sobre la predicción de deserción universitaria usando machine learning

La deserción universitaria trae como principal consecuencia el aumento del número de estudiantes con educación superior incompleta. Por lo cual se ha implementado técnicas predictivas que han ayudado a detectar patrones que sirven para el estudio del tema. Existen varias técnicas utilizadas para el análisis predictivo como: La Regresión Logística, El Análisis Bayesiano, Árboles de Decisión, entre otras, que han logrado ser de suma importancia al momento de arrojar resultados favorables que ayuden a llevar un control estadístico sobre los casos de estudiantes desertores. Es importante señalar que el uso de técnicas predictivas como la minería de datos en donde se pueda visualizar las razones por las que los estudiantes desertan según los patrones expresados estadísticamente para que las autoridades institucionales puedan tomar decisiones basándose en esta información y disminuir la deserción de los estudiantes universitarios. Este artículo recopila información sobre los diferentes algoritmos de predicción utilizados en el tema de la deserción universitaria y analiza los datos sobre técnicas, algoritmos, datasets, usados para la predicción de la deserción universitaria, con el objetivo de encontrar la técnica de mejor rendimiento al momento de realizar el estudio mediante métricas de evaluación como son el Accuracy, Recall y F-Score.The main consequence of university desertion is the increase in the number of students with incomplete higher education. Therefore, predictive techniques have been implemented that have helped to detect patterns that are useful for the study of the subject. There are several techniques used for predictive analysis such as: Logistic Regression, Bayesian Analysis, Decision Trees, among others, which have become extremely important when it comes to yielding favorable results that help to keep statistical control over student cases. deserters. It is important to point out that the use of predictive techniques such as data mining where it can be visualized the reasons why students drop out according to patterns expressed statistically so that institutional authorities can make decisions based on this information and reduce the dropout rate of university students. This article collects information on the different prediction algorithms used in the subject of university dropout and analyzes the data on techniques, algorithms, datasets, used for the prediction of university dropout, with the aim of finding the technique with the best performance at the moment. to carry out the study on university desertion through evaluation metrics such as Accuracy, Recall and F-Score

Scattering and absorption sections of Schwarzschild-anti de Sitter with quintessence

In this paper, we study the Schwarzschild-anti de Sitter black hole surrounded by quintessence. The critical values of the cosmological constant and the normalization factor are obtained. We described the event horizons and the extremal condition of the black hole surrounded by quintessence. Also, the effects of quintessence on the classical and semiclassical scattering cross-sections have been estimated. The absorption section is studied with the sinc approximation in the eikonal limit. This study considers the quintessence state parameter in the particular cases $\omega=-2/3$ and $\omega=-1/2$.Comment: arXiv admin note: substantial text overlap with arXiv:2103.0641

Geodesics of Hayward black hole surrounded by quintessence

Basing on the ideas used by Kiselev, we study the Hayward black hole surrounded by quintessence. By setting for the quintessence state parameter at the special case of $\omega=-\frac{2}{3}$, using the metric of the black hole surrounded by quintessence and the definition of the effective potential, we analyzed in detail the null geodesics for different energies. We also analyzed the horizons of the Hayward black hole surrounded by quintessence as well as the shadow of the black hole

Brane world corrections to scalar vacuum force in RSII-p

Vacuum force is an interesting low energy test for brane worlds due to its dependence on field's modes and its role in submillimeter gravity experiments. In this work we generalize a previous model example: the scalar field vacuum force between two parallel plates lying in the brane of a Randall-Sundrum scenario extended by $p$ compact dimensions (RSII-$p$). Upon use of Green's function technique, for the massless scalar field, the 4D force is obtained from a zero mode while corrections turn out attractive and depend on the separation between plates as $l^{-(6+p)}$. For the massive scalar field a quasilocalized mode yields the 4D force with attractive corrections behaving like $l^{-(10+p)}$. Corrections are negligible w.r.t. 4D force for $AdS_{(5+p)}$ radius less than $\sim 10^{-6}$m. Although the $p=0$ case is not physically viable due to the different behavior in regard to localization for the massless scalar and electromagnetic fields it yields an useful comparison between the dimensional regularization and Green's function techniques as we describe in the discussion.Comment: 14 pages, v2: discussion clarified, reference adde