http://www.teses.usp.br Dernières 10 publications de la Bibliothèque Numérique de Thèses et Mémoires de l'Université de São Paulo Institute of Astronomy, Geophysics and Atmosferic Science fr Thu, 23 May 2013 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14131/tde-19042013-101952/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14131/tde-19042013-101952/?&lang=fr The aim of this work is to obtain metallicity calibration for a sample of M dwarfs stars through spectroscopic studies. The low-mass M stars are the most numerous objects in the Galaxy and their main sequence lifetimes exceed the current age of the Universe. Thus, they reveal themselves as large laboratories for studying the structure and evolution of the Galaxy. The efforts of this work are focused in the construction of relations between the strengths of some molecular bands and metallicities for... tde@sc.usp.br (Alves, Viviane Salvador) Mémoires de Maîtrise Wed, 17 Apr 2013 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14133/tde-08042013-180829/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14133/tde-08042013-180829/?&lang=fr Secondary cyclones are systems that are not well defined yet and they are difficult to predict, requiring further studies to identify the signals that trigger their development. In this study we carried out a climatology and numerical study of secondary cyclogenesis over the southwestern South Atlantic Ocean in order to obtain information about these systems and understand the dynamic processes involved in its development. The climatology for the period 1980-2010 shows that an average of 3.9 secondary... tde@sc.usp.br (Iwabe, Clara Miho Narukawa) Thèse de Doctorat Wed, 17 Apr 2013 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14131/tde-01042013-194055/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14131/tde-01042013-194055/?&lang=fr The main objective of this work is to determine the distance of pre-main sequence stars in nearby star-forming regions. A precise determination of the distance to individual stars is required to accurately determine the main physical parameters of each star and the structure of the Galaxy. Here we investigate the Lupus and Ophiuchus star-forming regions that contain one of the richest associations of T Tauri stars. Most pre-main sequence stars in these regions were neither observed by the Hipparcos... tde@sc.usp.br (Galli, Phillip Andreas Brenner) Thèse de Doctorat Wed, 17 Apr 2013 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14133/tde-18122012-190417/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14133/tde-18122012-190417/?&lang=fr The operational routine in weather monitoring and forecasting has changed a lot in the past years. Besides conventional information, well known in operational centers, data from remote sensing such as satellite, weather radars and lightning detection network provide vital information in real time, as the main tools for severe weather detection and forecasting In South America, specially northeastern Argentina, Paraguay, Uruguay and southern Brazil are regions prone to severe weather (intense precipitation,... tde@sc.usp.br (Beneti, Cesar Augustus Assis) Thèse de Doctorat Wed, 03 Apr 2013 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14133/tde-16032013-100911/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14133/tde-16032013-100911/?&lang=fr How weather and climate influence man and society, are main targets since Hippocrates wrote "Airs, waters and places", 400 BC. Thermal comfort indices, in development since the twentieth century, are able to quantify these interactions by flexible and accessible applications, despite their own limitations. Although part of the biometeorological studies address climate change, only few deals with future scenarios. Therefore, the main objective is to evaluate the climatological behavior of... tde@sc.usp.br (Batista, Rafael Jonas Righi) Mémoires de Maîtrise Thu, 31 Jan 2013 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14131/tde-30012013-113804/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14131/tde-30012013-113804/?&lang=fr This project proposes a comprehensive approach to describe the evolution of the central region of the Galaxy, comprising the bulge, the bar and their interfaces with the inner disk and the central region of the halo. We intend to investigate the chemical and kinematic properties of these structures, which are interconnected, aiming to separate them and apply these results to a model for the formation and evolution of the bulge and inner disk, capable to describe simultaneously distinct aspects of... tde@sc.usp.br (Moraes, Oscar Cavichia de) Thèse de Doctorat Thu, 31 Jan 2013 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14131/tde-22112012-211332/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14131/tde-22112012-211332/?&lang=fr This work presents the study of some molecules of the interstellar medium that are useful for the bookkeeping of the molecular content of the universe and for prebiotic conditions on Earth and in other environments in the universe. The Horsehead Nebula was chosen as test object, due to its simple geometry, its moderate distance to us, its well-known ultraviolet radiation field resulting from the star $\sigma$ Orionis, and due the fact that it has been extensively studied in several works. In this... tde@sc.usp.br (Coelho, Luciene da Silva) Mémoires de Maîtrise Wed, 09 Jan 2013 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14133/tde-19122012-154326/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14133/tde-19122012-154326/?&lang=fr Forecasting and Tracking the evolution of Cloud Clusters (ForTraCC) technique and numerical simulations have been used to understand the development of Mesoscale Convective Systems (MCSs). In general, these systems are associated with intense rainfall, wind gusts, hail and sometimes with tornados. This work has adapted the ForTraCC to track MCSs in the outgoing longwave radiation (OLR) from RegCM4 climatic simulations. The RegCM4 was nested in ERA-Interim reanalysis in a domain covering the South... tde@sc.usp.br (Segalin, Bruna) Mémoires de Maîtrise Wed, 09 Jan 2013 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14133/tde-19122012-120128/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14133/tde-19122012-120128/?&lang=fr Forecasts of daily maximum and minimum temperatures and rainfall performed by the operational numerical weather prediction WRF (Weather Research Forecasting) model in the São Paulo are evaluated. Initial and boundary conditions provided by the 00UTC Global Forecast System (GFS) Model and WRF run for 72 hours, with two nested grids (with horizontal grid spacing of 50 km, D1, and 16.6 km, D2). The study was made for April 2010 to March 2011 period. Daily maximum and minimum temperatures comparisons... tde@sc.usp.br (Bender, Fabiani Denise) Mémoires de Maîtrise Fri, 21 Dec 2012 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14131/tde-08112012-160406/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14131/tde-08112012-160406/?&lang=fr Herbig Ae/Be (HAeBe) objects are intermediate mass (2 -10 Msun) stars in the pre-main sequence. Some of their properties remain not well understood to date. Only a full multi-wavelength study is able to reveal a reasonable scenario for their circumstellar material. The purpose of the present work is to study the structure, composition and evolution of these circumstellar environments. To address this issues, the sample of HAeBe candidates detected by the Pico dos Dias Survey (Vieira et al., 2003)... tde@sc.usp.br (Vieira, Rodrigo Georgetti) Thèse de Doctorat Fri, 21 Dec 2012 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14132/tde-18122012-154942/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14132/tde-18122012-154942/?&lang=fr The concentration of equivalent uranium, equivalent thorium, potassium and exposure rate were calculated on different days and hours for the same location, from airborne gamma ray spectrometric data, measured at an average height of 81 meters. The individual profiles were compared with mean profiles of all the measurements. The effects of atmospheric radon and its decay products were corrected using a pack of additional detectors crystals facing up (upward looking detector), and the calibration values... tde@sc.usp.br (Justina, Fabiano Della) Mémoires de Maîtrise Wed, 05 Sep 2012 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14133/tde-06062012-115400/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14133/tde-06062012-115400/?&lang=fr The South Atlantic Convergence Zone (SACZ) is a meteorological phenomena that plays an important role in the precipitation regime over the region it covers, resulting in a high pluviometric indices in South America. This study shows, from the mesoscale analysis prospective that Mesoscale Cyclonic Vortex (MCV) is associated to the SACZ through a feedback process. This system is generated embedded in a stratiform environment within the SACZ region, taking moisture up, increasing vertical winds resulting... tde@sc.usp.br (Quadro, Mario Francisco Leal de) Thèse de Doctorat Wed, 05 Sep 2012 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14131/tde-27082012-025008/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14131/tde-27082012-025008/?&lang=fr In this work, we have treated and analyzed data cubes of 8 nearby active galactic nuclei, in the optical and in the infrared. All data cube treatment and analysis were performed using a series of specific methodologies, many of which were developed in the last few years by the author's working group. The analysis of all data cubes was performed with four main objectives: analysis of the general phenomenology of the AGN environment, using PCA Tomography; analysis of the stellar populations, of the... tde@sc.usp.br (Menezes, Roberto Bertoldo) Thèse de Doctorat Wed, 05 Sep 2012 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14131/tde-29062012-100922/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14131/tde-29062012-100922/?&lang=fr We compare two molecular clouds of the Monoceros Complex in order to study their physical conditions related to the early stages of star formation. The selected clouds, Rosette (RMC) and Monoceros R2 (Mon R2), are interesting regions due to their characteristics that may be confronted with the hypothesis of star formation triggered by high velocity clouds (HVCs) crossing through the Galactic plane. We evaluate the properties of these clouds using maps obtained on the basis of dierent spectral bands... tde@sc.usp.br (Gama, Diana Renata Gonçalves) Mémoires de Maîtrise Wed, 20 Jun 2012 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14133/tde-18062012-152102/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14133/tde-18062012-152102/?&lang=fr Sea breeze events (SB) are common in Metropolitan area at São Paulo (MASP). Particularly, in the summer, SB triggers over MASP deep convection, heavy rainfall, wind gusts, hail and lightning. OLIVEIRA and SILVA DIAS (1982) method was used to identify the SB events. SB events between 2005 and 2008 were analysed by means of surface and upper air measurements, weather radar, satellite and numerical modelling. In general, the SB front penetrates in MASP between midafternoon and evening increasing dew... tde@sc.usp.br (Vemado, Felipe) Mémoires de Maîtrise Wed, 20 Jun 2012 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14131/tde-18042012-162353/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14131/tde-18042012-162353/?&lang=fr Understanding the way galaxies form and evolve throughout the cosmic time remains one of the greatest challenges of modern cosmology. Several processes are known to play a role in the formation of galaxies, such as feedback from supernovae and active galactic nuclei, chemical and dynamical evolution and environmental effects. This thesis encompasses these processes, from an observational point of view. The Milky Way plays a pivotal role in understanding the various processes involved in the formation... tde@sc.usp.br (Trevisan, Marina) Thèse de Doctorat Wed, 20 Jun 2012 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14132/tde-30052012-080541/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14132/tde-30052012-080541/?&lang=fr In this research work a study of the method of deconvolution was conducted in order to improve the adequacy to the shallow subsurface scale of investigation to the estimate of the seismic wavelet and of the earth impulse response. Deterministic and statistical (blind) procedures were evaluated over synthetic and real data acquired with impact sources and a pseudo-random source. tde@sc.usp.br (Spadini, Allan Segovia) Mémoires de Maîtrise Wed, 20 Jun 2012 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14131/tde-18062012-061001/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14131/tde-18062012-061001/?&lang=fr The Small Magellanic Cloud (SMC) is a gas rich irregular galaxy which, together with the Large Magellanic Cloud (LMC), orbit the Milky Way (MW). They form a triple system in constant interaction. The SMC is a metal poor galaxy and, due to this, its interstellar medium (ISM) presents different properties from the Galaxy's ISM. In addition to that, the importance of magnetic fields on galactic scales is being recognized nowadays. Therefore, the aim of this project was to study the magnetic field structure... tde@sc.usp.br (Gomes, Aiara Lobo) Mémoires de Maîtrise Wed, 20 Jun 2012 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14131/tde-12062012-213540/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14131/tde-12062012-213540/?&lang=fr Even after 80 years of intense research, the composition of neutron stars remains unknown, since both the dense matter in the interior of these compact objects and the matter moving around them are in extreme physical conditions, unreproducible in terrestrial laboratories. In this Thesis, we follow four different interconnected ways to approach these extreme objects. First, we explore the mathematical structure of neutron stars, building solutions parametrised solely by the central density, what... tde@sc.usp.br (Avellar, Marcio Guilherme Bronzato de) Thèse de Doctorat Fri, 18 May 2012 00:00:00 -0300 http://www.teses.usp.br/teses/disponiveis/14/14133/tde-14052012-132233/?&lang=fr http://www.teses.usp.br/teses/disponiveis/14/14133/tde-14052012-132233/?&lang=fr This work aims to investigate the synoptic and dynamic processes of a sample of subtropical cyclones that occurred near the east coast of South America. A cyclonic vorticity maximum tracking algorithm and the Cyclone Phase Space (CPS) algorithm are used to track and to classify the life cycle evolution of the cyclones. By automating these algorithms, it was possible to perform the analysis of the phase diagrams of all the cyclones occurred in the Subtropical Atlantic during 2008, 2009 and March 2010.... tde@sc.usp.br (Dutra, Lívia Márcia Mosso) Mémoires de Maîtrise