Galaxy Formation in the Lambda-Cold Dark Matter Cosmology

In this thesis I explore the effects of the various physical processes behind galaxy formation and evolution in hierarchical cosmologies by using semi-analytical modelling. I use the Durham semi-analytical model GALFORM. I first test the GALFORM model predictions using observations from the Sloan Digital Sky Survey (SDSS). I use two different variants of the model, Baugh et al (2005), which assumes a top-heavy initial mass function (IMF) in starbursts and superwind feedback, and Bower et al (2006), which incorporates AGN feedback with a standard IMF. I compare the luminosity function, colours, sizes and morphology distributions of present-day galaxies in the models and with the SDSS. The Bower et al model better reproduces the shape of the luminosity function, the morphology-luminosity relation and the colour bimodality observed in the SDSS data. The Baugh et al model is much more successful at predicting galaxy sizes for late-type galaxies. Both models have problems with the sizes of early-type galaxies, which are predicted to be too large for low luminosities and too small for high luminosities compared to SDSS. I tested the impact on the model predictions of varying the prescriptions for supernova feedback, disk instabilities and galaxy mergers. In the second part of the thesis I explore the connection between two high redshift star-forming galaxy populations and present-day galaxies and their contribution to the star formation history. I built galaxy merger trees and followed the evolution and properties of submillimetre galaxies (SMGs) and Lyman-break galaxies (LBGs) using the Baugh et al (2005) model. The model predicts that the descendants of SMGs (S_{nu} > 5 mJy) have a median stellar mass of ~10e11/h solar masses, and that more than 70% of these descendants are bulge-dominated. More than 50% of present-day galaxies with stellar masses larger than 7 x 10e11/h solar masses are predicted to be descendants of such SMGs. Somewhat controversially, the stellar mass produced in the submillimetre phase contributes only 0.2% of the total present-day stellar mass, and 2% of the stellar mass of SMG descendants. The descendants of z=3 LBGs are predicted to have a median stellar mass equal to that of the Milky Way (M = 4 x 10e10/h solar masses), while the descendants of z=6 LBGs are predicted to have a larger median stellar mass (M = 10e11/h solar masses). The model predicts that only one in every 16 and one in every 50 Milky Way mass galaxies have a Lyman-break galaxy progenitor at z=3 and z=6 respectively

Essays in Female Labor Supply in Ecuador

This is a solo-authored dissertation that contains three papers that each examines a specific aspect of the labor supply in the Ecuadorian labor market between 2007 and 2017. The chapters of this dissertation all use data from the National Survey of Employment, Unemployment, and Underemployment; in Spanish Encuesta Nacional de Empleo, Desempleo y Subempleo (ENEMDU) to empirically examine labor supply in the Ecuadorian labor market, specifically female labor supply. The first chapter analyzes the impact on labor supply of the last increment of the cash transfer under the Human Development Credit (BDH) program in Ecuador. This study employs a difference-in-differences approach, comparing poor households that receive the transfer with poor households that are not part of the program. Empirical results reveal that households that are part of the program, on average, increased their labor supply by 2.5 hours at the intensive margin and by 7.23 percentage points at the extensive margin. More importantly, results reveal that women increased their labor supply at the intensive and extensive margin by 1.65 hours, and by 5.63 percentage points respectively, while results for men are not statistically significant. The second chapter explores married women’s labor supply elasticities in Ecuador between 2007 and 2017. Specifically, the focus of this chapter is to examine how married women’s hours of work respond to their income from labor, and non-labor income. Overall, empirical results suggest that between 2007 and 2017, hours wage elasticities increased, whereas hours non-labor income elasticities and participation non-labor income elasticities appear to had a minimum increment. The third chapter adds to the second by analyzing the labor supply responses of single women in Ecuador between 2007 and 2017. Like in the second chapter, this chapter examines how single women’s hours of work respond to their income from labor and non-labor income on the intensive and extensive margin. Empirical results show that during the last decade, the labor supply responsiveness of single women in Ecuador has remained relatively constant

Revision del género endémico cubano Trimytantron (Coleoptera: Tenebrionidae: Trimytini) con la descripción de ocho nuevas especies

A revision is provided for the Cuban endemic tenebrionid genus Trimytcmtron. Material of Ardoin's five previously described species (Trimytalltron decui, poeyi, cub anum, viiiai and negrai) is compared with the extensive series of the senior author's collection (O.H.G). Eight new species are herein described and illustrated. Also their genitalia are illustrated, as well as some of the previously described species not illustrated by Ardoin in his original descriptions. Material from several eastern localities assigned to T. decui are not exactly identical, showing some variations at subspecific level. Although these variations are mentioned, they are not described. The same situation applies to populations assigned to the new species described from the northern part of Santa Clara (the cave complex of Caguanes). Genitalia of six of the eight new species are herein illustrated as are those of T. decui and T. poeyi . Photographs of the eight new taxa are also provided; as well as a synoptic table of the principal diagnostic characters of all taxa of the genus

Diseño del sistema de gestión bajo la Norma Oshas 18001 para la empresa D-Una en la ciudad de Barranquilla

Ingeniería Industrial18001 TO THE COMPANY D-A THE CITY OF BARRANQUILLA manuals Industrial Safety, Occupational Health, and programs Hygiene measures for the company D-A was designed based the OHSAS 18001 standard, in order to minimize the risks they are exposed day after day employees contribute to their well-being and increase productivity in the company. First of all, a process map was made in order to identify the strategic direction of the company, and align the work with the same goals. Subsequently a diagnosis of the current situation of the company against the requirements of the OHSAS 18001 standard was carried out. Corrective and preventive action plans were established to adjust the position of the company to the requirements of the OHSAS 18001 standard. The panorama of risks, vulnerability analysis andSISO manuals are performed for a later implementation in the above mentioned company.En el presente trabajo DISEÑO DEL SISTEMA DE GESTIÓN BAJO LA NORMA OSHAS 18001 PARA LA EMPRESA D-UNA EN LA CIUDAD DE BARRANQUILLA se diseñan los manuales de Seguridad Industrial, Salud Ocupacional, y los programas de Higiene laboral para la empresa D-UNA, basados en la norma OHSAS 18001, con el fin de minimizar los riesgos a los que se exponen día a día los empleados, contribuir con el bienestar de ellos y aumentar la productividad en la empresa. Lo primero que se realizó fue un mapa de procesos con el fin de saber el direccionamiento estratégico de la empresa, y alinear el trabajo con los objetivos de la misma. Posteriormente se realizó el diagnóstico de la situación actual de la empresa frente a los requisitos exigidos por la norma OHSAS 18001. Se establecieron los planes de acción correctivos y preventivos para ajustar la situación de la empresa frente a los requisitos exigidos por la norma OHSAS 18001, se realizó el panorama de riesgos, el análisis de vulnerabilidad y el Manual SISO. Para su posterior implementación en la empresa en mención

Proyecto de derribo y seguimiento de obra: Complejo del Termalismo

Treball final de Grau en Arquitectura Tècnica. Codi: ED0945. Curs acadèmic: 2020/202

Instability onset for submerged cylinders

This paper describes how the global stability of a circular cylinder is affected when submerged in a two-phase gravitational flow. The flow behavior is governed by both the Reynolds and the Froude number, while the depth of the cylinder has been varied to create different scenarios for the stability analysis. The baseflow obtained by the numerical solution of the 2D Navier-Stokes equations has been analyzed, and the first bifurcation (i.e. Hopf type) has been explored for different depths, Reynolds and Froude numbers. In addition to the typical vortex shedding instabilities associated to isolated cylinders, the presence of an interface between fluids creates new instabilities associated with the free surface that present more complex and deformed structures. According to the region of the parameter space studied here, two main causes of instabilities have been found: the ones provoked by vortex shedding on the cylinder wake (wake instabilities) at low Froude numbers and the ones produced by the free surface deformation (free surface instabilities) at high Froude numbers. When instabilities are related to vortex shedding, the critical Reynolds number and the frequency of the most unstable mode are comparable to the classical solution without free surface and gravity effects. In all cases, the shape of the most unstable mode is deformed and distorted according to the free surface location, while the critical Reynolds numbers and the frequency associated to the perturbation are both affected by the gravity and the free surface presence.Fil: González-Gutierrez, Leo M.. Universidad Politécnica de Madrid; EspañaFil: Gimenez, Juan Marcelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Centro de Investigaciones en Métodos Computacionales. Universidad Nacional del Litoral. Centro de Investigaciones en Métodos Computacionales; ArgentinaFil: Ferrer, Esteban. Universidad Politécnica de Madrid; Españ

Perfil de potência anaeróbia en jogadores de voleibol juvenis

El objetivo de principal de este estudio fue evaluar la potencia anaeróbica desarrollada por Jugadores de Vóleibol, según el rol de juego desempeñado (varones n=51; Edad15.43±1.45 Años; Altura 1,72±0,08 Metros; Peso 64,16 ±10,17Kilogramos; IMC, 21,65 ±2,30; damas n= 37; Edad, 14.62±1.65; altura 1,64±0,07 Metros; Peso 59,25±7,03Kilogramos; IMC, 21,94 ±2,60). Se detectaron diferencia significativa en grupos de Centrales con los armadores y Líberos, (p<0,005) respectivamente. El grupo del género femenino, no se identificarón diferencias significativas, (p<0,005) según rol de juego. Por lo tanto, los grupos que desarrollaron una mayor Potencia Máxima, tienen una mejor relación entre la fuerza y velocidad desarrollada para los desplazamientos que componen este deporte

Planta de procesamiento y comercialización de ladrillos ecológicos, producidos con barros residuales provenientes de la producción de boratos a partir de ulexita

Proyecto Integrador (II)--FCEFN-UNC, 2014Evalúa principalmente la fáctibilidad técnica y económica de producir y comercializar ladrillos fabricados a partir de los mencionados barros residuales, aprovechando la característica de fundente metalúrgico del boro para la fabricación de cerámicos, logrando así mitigar el riesgo que éstos significan para el medio ambiente, obteniendo al mismo tiempo un beneficio económico