Atomic Physics
Mostrando 13-24 de 47 artigos, teses e dissertações.
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13. Caracterização morfológica de tecidos oculares por microscopia de força atômica (MFA) / Morphological characterization of ocular tissues with atomic force microscopy AFM)
Neste trabalho foi investigado através da Microscopia de Força Atômica (MFA) a topografia de tecidos oculares, dentre eles, cristalinos e córneas e doenças associadas. O principal objetivo foi o desenvolvimento de metodologia apropriada para a caracterização do cristalino para distintos estágios de maturação da catarata. A metodologia foi estendida
Publicado em: 2009
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14. CARACTERIZAÇÃO DE DEFEITOS MECÂNICOS PRODUZIDOS POR NANOINDENTAÇÃO NO INP / CHARACTERIZATION OF MECHANICAL DEFECTS PRODUCED BY NANOINDENTATION IN INP
In this thesis, the mechanical deformation mechanism of semiconductors III-V was studied, especially for InP. Defects were produced by indentations using an atomic force microscope and a Triboscope nanoindenter. The AFM tip torsion during indentation difficult the control and the reproducibility of AFM nanoindentation experiments. Nevertheless, the tip torsi
Publicado em: 2009
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15. Análise de cerâmicas arqueológicas do Sambaqui do Bacanga (São Luís, MA) por EDXRF portátil
Sambaqui do Bacanga archaeological site is located in the Island of São Luis -Maranhão Brazil, in the region bathed by the Bacanga River. A tratigraphic collection of 78 ceramic fragments was collected during the years 2005 and 2006, to perform a qualitative analysis of the chemical elements employing a Portable System of Energy Dispersive X-ray Flu
Publicado em: 2009
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16. Multicolor Quantum Correlations in the Optical Parametric Oscillator / Correlações quânticas multicolores no oscilador paramétrico ótico
We have investigated the collective quantum properties of the three bright light beams produced by an optical parametric oscillator (OPO) operating above threshold, named pump, signal, and idler. We have analyzed experimentally their intensity and phase quantum fluctuations, and how they are correlated. For the first time, we have observed the existence of p
Publicado em: 2008
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17. Abordaje de la enseñanza de aspectos importantes de la física moderna a traves del uso de un laser de xenon multi-ionico pulsado
This work intendes to present a pulsed multi-ionic Xe laser to perform demonstrations, lab experiments or begin research works in topics of modern physics, atomic spectroscopy and gaseous lasers. It can be used also in the graduate and post-graduate teaching. In addition, the use of all the instruments that compose the equipment allows to make contact with h
Revista Brasileira de Ensino de Física. Publicado em: 2007
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18. Uma introdução à espectroscopia atômica: II - o espectro do sódio
The present article is devoted to Chemistry or Physics undergraduate students, given their difficulty to understand fundamental concepts and technical language used in atomic spectroscopy and quantum mechanics. An easy approach is shown in the treatment of the emission spectrum of the sodium atom without any involved calculations. In a previous article, the
Química Nova. Publicado em: 2007
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19. Estado fundamental e excitações coletivas de condensados de Bose-Einstein espinoriais / Ground state and collective excitations od spinor Bose-Einstein condensates
In the framework of the Bogoliubov theory, we determined the equilibrium configurations and the collective excitations of a homogeneous Bose-Einstein S = 1 spinor condensate, in the presence and absence of an externa1 magnetic field. In this thesis we found the equilibrium configurations as function of the parameters and m, where q is the intensity of the qu
Publicado em: 2007
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20. Acoplamento de dois feixes com lasers de femtossegundos em vapor de Rb
Femtosecond lasers operating in the mode-locked regime have a repetition rate determined by the round trip time of the pulse inside the laser cavity (TR = 2L/c). For Ti:sapphire lasers the repetition rate is typically of the order of 100 MHz, with TR 10 ns. Under this condition TR may be smaller then the population relaxation time (T1) and the coher
Publicado em: 2007
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21. Análise teórica da superfície Si(111)-(7x7)
In this work, wecarry out theoretical study of the silicon surface reconstruction (7x7) grown in the [111] direction, denoted by Si(111)(7x7), using the Density Functional Theory formalism, within the Local Density Approximation (LDA) for the exchange correlation term. The interaction with the valence electrons and the core ion (nucleus more core electrons)
Publicado em: 2007
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22. Correlations and interferences in atomic systems of cold Bose Einstein condensates / Correlações e interferência de sistemas atômicos de Bose-Einstein frios
This work consists of a theoretical study of the coexistance of coupled atomic Bose-Einstein condensates. These mixed condensates can consist of atoms of the same element in different hyperfine internal states. A different situation is that in which an atom in one internal state can ocupate different single particle external states. The similarities and diff
Publicado em: 2006
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23. Estudo da formação de hidrogênio atômico no filamento do reator HFCVD / Study of the formation of atomic hydrogen in the filament of reactor HFCVD
A complexidade do entendimento no processo de deposição de diamantes HFCVD é causada pela interdependência de quatro estágios principais que são: formação de radicais perto do filamento, seu transporte, reações químicas na fase gasosa e reações químicas na superfície do substrato. Para entender os fenômenos que ocorrem durante o processo de d
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2005
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24. MBE growth and characterization of films SnTe layers and SnTe/Sn1-x EuxTe heterostructures on BaF2 / Crescimento por MBE e caracterização de filmes SnTe e heteroestruturas de SnTe/Sn1-x EuxTe sobre BaF2
This work presents a systematic investigation of structural and electrical properties of SnTe epitaxial films grown on BaF2 substrates, as well as a study of structural properties of Sn1-xEuxTe (0
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2005