Search
Now showing items 141-150 of 151
Diagrama de fases magnéticas e transição de fase quântica em ligas de Cr-Ti
(Universidade Federal de São Carlos, 2009-03-30)
In this work we present the results of characterization of Cr-Ti alloys with small quantities of Ti. The samples were prepared in a melting arc furnace, using hight purity Cr and Ti. The magnetic phase diagram was determined ...
Nanofios de Ge : síntese e dispositivos
(Universidade Federal de São Carlos, 2012-03-06)
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 ...
Síntese e caracterização de nanopartículas de óxido de ferro e de grafite magnética fluida (GMF)
(Universidade Federal de São Carlos, 2008-09-05)
In this work were studied the physical properties of magnetic nanoparticles, based on iron oxide, and magnetic graphite fluid particles. The work was developed in three steps: 1) synthesis of the magnetic nanoparticles of ...
Construção e caracterização do campo acústico de transdutores ultra-sônico piezoelétrico de polarização variável
(Universidade Federal de São Carlos, 2008-10-23)
This work was motivated on the great technological and commercial interest of ultrasonic transducer, capable to generate diffraction controlled ultrasonic beams in the
frequency range of kHz up to MHz. As a solution, in ...
Geração de corrente spin polarizada em heteroestruturas dopadas com impurezas magnéticas
(Universidade Federal de São Carlos, 2015-08-07)
In this dissertation, the computational modeling of two semiconductor structures composed of two quantum wells was performed, being a quantum well doped with magnetic impurities. Each structure was designed to form a ...
Estudo de algoritmos para a determinação da temperatura de fusão
(Universidade Federal de São Carlos, 2015-08-31)
In this work, we studied the main methods used in molecular dynamics simulations to obtain the melting temperature of crystalline materials. The methods evaluated were the solid-liquid coexistence, mechanical melt of bulk, ...
Estudo da viabilidade de equipamento LIBS-LIF contínuo para aumento do limite de detecção do mercúrio
(Universidade Federal de São Carlos, 2017-09-22)
This work aims to verify the feasibility of a continuous LIBS-LIF equipment construction at 405 nm for heavy metals analysis, focusing on mercury. We have studied experimentally a diode laser of a continuous light source ...
Efeitos do campo magnético sobre processos de corrosão em aço AISI 1020
(Universidade Federal de São Carlos, 2017-09-19)
In this dissertation the effects of the application of magnetic field during the electrochemical reactions of corrosion in samples of steel AISI 1020 in KNO_3 solution were investigated. The experiments were measurements ...
Efeitos de dimensionalidade em perovskitas de haletos para aplicações em células solares: um estudo ab initio
(Universidade Federal de São Carlos, 2022-10-07)
The structural stability and toxic lead are known obstacles to the current photovoltaic application of perovskite solar cells (PSCs) with high power conversion efficiencies (PCEs). Herein, we perform a systematic study ...
Blockade and antiblockade effects with near-ground state neutral atoms
(Universidade Federal de São Carlos, 2022-09-06)
In this work we study the photon blockade and antiblockade effects in a system of neutral
atoms with a two-level structure, in the limit where induced dipole-dipole interactions
mediated by light are relevant. Such system ...