Browsing Teses e dissertações by Title
Now showing items 217-236 of 338
-
Multiferróicos monofásicos a base de Pb(Fe2/3W1/3)O3-PbTiO3: acoplamento magnetoelétrico intrínseco
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, , 25/11/2010)Multiferroic ceramic solid solutions between the ferroelectric relaxor Pb(Fe2/3W1/3)O3 (PFW) and normal ferroelectric PbTiO3 (PT) [PFW-PT] has been synthesized by a modified B-site precursor method and characterized by ... -
Nanoarquitetura em sistemas de alumina anódica porosa e configurações magnéticas de partículas de Co eletrodepositadas.
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, , 30/10/2005)This thesis presents results on tailoring porous anodic alumina films, the Co-CoO electrodeposition on alumina template and the magnetic behavior of such system. Mono and bi-modal pore distribution at the film surface were ... -
Nanofios de Ge : síntese e dispositivos
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, , 06/03/2012)Abstract In this work, germanium nanowires' based devices were studied and developed and the influence of natural disorder on the electronic properties of these structures was also investigated. Parameters related to the ... -
Nanofios de germânio : síntese, caracterização estrutural, propriedades elétricas e aplicações
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 09/08/2016)The element germanium is part of the history of electronic equipment based on semiconductor from its early days with the invention of the transistor, until today with current research related to growth of germanium ... -
Obtenção e caracterização de heteroestruturas epitaxiais magnetoelétricas de [KNbO3]0,9-[BaNi1/2Nb1/2O3-𝛿]0,1 e [La0,7Sr0,3MnO3]
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 07/10/2016)Magnetoelectric materials have been extensively studied in the last decade, particularly due to the applicability for sensors, attenuators, transformers and others. Hence as an objective for this work we propose a study ... -
Obtenção e caracterização de perovskitas supercondutoras monocristalinas do tipo YxPr1-xBa2Cu3O7-δ dopadas por Fe, Ni, Ga e Zn
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, , 30/04/2009)The Praseodymium is known to have a singular behavior in the family of cuprate superconductors of high critical temperature of the type RE-123. When these cuprates are doped with Praseodymium apparently critical temperature ... -
Obtenção, caracterização e avaliação da performance fotocatalítica de nanoestruturas de TiO2 contendo metais de transição (Nb e W)
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 18/04/2022)Heterogeneous photocatalysis has been considered a promising alternative for the removal of several organic pollutants linked to environmental pollution. Among a range of materials currently used, titanium dioxide (TiO2), ... -
Obtenção, propriedades e fenomenologia de materiais ferroelétricos com estrutura tungstênio bronze
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, , 23/02/2007)The processing of lead metaniobate (PN) ferroelectric ceramics was optimized, therefore, in this work, the main details to obtain PN ceramics with density higher than 96 % of the ideal density are presented and ... -
Ondas de spin em paredes de domínio unidimensionais em monocamadas magnéticas
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, , 16/08/2012)Recent investigations on ferromagnetic monolayers predict the existence of spinwave modes without gap in the spectrum, even in the presence of anisotropy. These excitations propagate within the domain walls that exist in ... -
Ondas gravitacionais e o espectro de anisotropia tensorial na presença de neutrinos cosmológicos
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, , 10/07/2012)In this work we have studied the evolution of primordial gravitational waves coupled to anisotropic stress tensor of cosmological neutrinos. As in a radiation dominated universe, in a universe dominated by radiation and ... -
Optical and transport properties of p-i-n GaAs/AlAs resonant tunneling diode
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, , 26/05/2014)In this thesis, we have investigated the optical and transport properties of a p-i-n GaAs-AlAs resonant tunneling diode (RTD). The possibility of controlling and significantly varying the density of carriers accumulated ... -
Optimal quantum control applied to quantum dots
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 03/10/2019)In the present study, we review the one-qubit dynamics and we offer a new unifying interpretation of the Landau-Zenner and the Rabi dynamics, by indicating the physical elements responsible for the manifestation of one ... -
Optimization and application of the quantum adiabatic theorem, and the quantum origin of classical interference
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 29/03/2022)In this master’s thesis, we developed three different topics. In the first topic, we studied the quantum adiabatic brachistochrone method (QAB) for optimizing adiabatic dynamics. In the first part of this study, we reported ... -
Ordenamento ferromagnético em poli(3-hexiltiofeno) à temperatura ambiente
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, , 14/07/2009)In this work we present, for the first time, a systematic study of magnetic properties of an alkyl derivative of thiophene: the poly(3-hexylthiophene) prepared in acetonitrile. This polymer was investigated in different ... -
Origem dos momentos magnéticos localizados em ligas de cromo com metais de transição por oscilações de Friedel
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, , 02/08/2006)The fundamental magnetic properties of chromium and its alloys Cr(1¡x)Nb(x) and Cr(1¡x)V(x), were investigated with the aim to achieve a better comprehension about the nature of the spin density waves. Was dened the edge ... -
Otimização das propriedades superficiais dos aços inoxidáveis AISI 304, AISI 316L e ASTM F138 recobertos com filme de alumínio e nitretados
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, , 12/03/2010)Many industrial applications of stainless steel require the modification of surface properties, such as corrosion resistance, and mechanical properties such as hardness. For this purpose several surface modify techniques ... -
Otimização do controle de Diatraea saccharalis (Fabricius, 1794) (Lepidoptera: Crambidae) por meio do parasitoide Cotesia flavipes (Cameron, 1891) (Hymenoptera: Braconidae) visando a redução de custos
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 26/03/2018)Brazil is the world’s largest producer of sugarcane. However, this agricultural crop is attacked by pests, especially Diatraea saccharalis. Its control in Brazil is carried out mainly by the action of the caterpillar ... -
Otimização dos campos de proteção nas técnicas de desacoplamento dinâmico contínuo
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 15/09/2023)In this research project, we investigate the method known as \textit{continuous dynamical decoupling}, which is based on the use of continuously applied external fields to maximize the fidelity of quantum logical operations ... -
Otimizando a eficiência de células solares baseadas em nanoestruturas semicondutoras quaternárias
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, Câmpus São Carlos, 28/02/2020)Solar cells composed of semiconductor materials with gap energies and different structures, commonly known as Multijunction, have been the record holders for efficiency in converting solar to electric energy in recent ... -
O papel da interação elétron-elétron no regime Hall quântico interio.
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Física - PPGF, , 02/04/2004)Experimental and theoretical studies of the aspects of particle-like and collective behavior of electrons in the proximity of the edges of two-dimensional (2DES) and quasi-one-dimensional (Q1DES) systems, named quantum ...