External Photon
Mostrando 1-12 de 14 artigos, teses e dissertações.
-
1. Repulsive and attractive ferroglasses: a SAXS and XPCS study
A dynamical freezing, which is the analogous of a glass transition, is observed at large concentrations in aqueous dispersions of maghemite nanoparticles. We study experimentally the structure and the dynamical properties of two dense ferroglass-formers in two very distinct states of interparticle interaction, either strongly repulsive or attractive. The sta
Brazilian Journal of Physics. Publicado em: 2009-04
-
2. Perda de coerencia e teletransporte em eletrodinamica quantica de cavidades / Decoherence and teleportation in cavity quantum electrodynamics
In this work, we analyze concepts of Quantum Information and Quantum Optics in the context of Cavity Quantum Electrodynamics (CQED). Nowadays, CQED is achieving great technological advances, justifying the interest in several proposals of experimental implementation. In the first part of the work, we consider the effect of spontaneous emission in a system of
Publicado em: 2008
-
3. Acoplamento dos fantomas tomogrÃficos FAX06 e MAX06 ao cÃdigo Monte Carlo GEANT4
The MAX06 and the FAX06 phantoms have been developed in recent years at the Department of Nuclear Energy of the Universidade Federal de Pernambuco. They are the first two adult tomographic or voxel phantoms which have body heights, body weights as well as organ and tissues masses based on the anatomical reference data given by the International Commission on
Publicado em: 2007
-
4. Efeitos de superfície nas propriedades térmicas e dinâmicas de filmes de cristais líquidos esméticos. / Surface effects on the thermal and dynamical proprieties of smectic liquid crystal filmes.
The thermal and dynamical properties of free-standing films are strongly dependent on the boundary conditions and the presence of an external field. Using distinct theoretical models and the dynamic light scattering experimental setup, we study the surface and external field effects on the relaxation dynamics, fluctuation-induced interaction energy, and phas
Publicado em: 2007
-
5. Dependência das propriedades da região-D ionosférica com o ciclo de atividade solar / Dependence of ionospheric D region properties on solar activity cycle
The goal of this work is to provide new clues for a better understanding of the quiescent ionosphere during different solar activity conditions. For that we study the lower ionospheric response to external perturbations, as solar X-rays emitted during flares. We use solar X-ray fluxes provided by GOES satellites, and ionospheric SPA (Sudden Phase Anomalies)
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/07/2006
-
6. Caracterização elétrica de células solares de tripla tecnologia de matérias e sensores / Electrical characterization of triple junction solar cells - GAINP/GAAS/GE
Triple junction solar cells use a combination of semiconductor materials to more efficiently capture photons in the range of 300nm to 1800nm of sun solar spectrum. Minimum average conversion efficiency AM0 for first generation TJ solar cell for space use is 26,0%. The GaInP, GaAs and Ge were select because of their collective ability to match bandgap energie
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/03/2006
-
7. Individual monitoring for external exposures: experimentation and simulation with Monte Carlo Method / Monitoração individual externa: experimentos e simulações com o método de Monte Carlo
In this work, we have evaluated the possibility of applying the Monte Carlo simulation technique in photon dosimetry of external individual monitoring. The GEANT4 toolkit was employed to simulate experiments with radiation monitors containing TLD-100 and CaF2:NaCl thermoluminescent detectors. As a first step, X ray spectra were generated impinging electrons
Publicado em: 2005
-
8. Transferencia de coerencia atomo-campo em um micromaser de dois fotons
The construction of pure states of the electromagnetic field is important not only for the study of the foundations of the quantum mechanics, such as the question of the Schrõdinger cat states, but also for its potential applications, for example, in quantum computation, quantum criptography and in higher precision measurements. In this thesis, we present t
Publicado em: 2003
-
9. Interação de 2-metilpropanal e clorpromazina com biomoleculas
The presence of enzymically generated triplet acetone in red cells and energy tranfer to eosin, rose bengal and 9,10-dibromoanthracene-2-sulfonate was indicate by: (i) product distribuition; (ii) KETt, similar to the 2-methylpropanal/Peroxidase/O2 system; (iii) correlation between hemolysis, oxigen uptake and photon emission; (iv) membrane protection by ener
Publicado em: 1980
-
10. Two-photon spectroscopy of locked-11-cis-rhodopsin: evidence for a protonated Schiff base in a neutral protein binding site.
We studied the nature of the protein binding site of rhodopsin, using two-photon spectroscopy to assign the location of the low-lying "covalent" 1Ag*- -like pi pi * state in a model rhodopsin containing a locked-11-cis chromophore. The two-photon thermal lens maximum is observed at 22,800 cm-1, approximately equal to 2000 cm-1 above the one-photon absorption
-
11. Carbon Dioxide and Light Responses of Photosynthesis in Cowpea and Pigeonpea during Water Deficit and Recovery 1
Greenhouse-grown pigeonpea (Cajanus cajan, [L.] Millsp.; cultivar UW-10) and cowpea (Vigna unguiculata, [L.] Walp.; cultivar California No. 5) were well-watered (control) or subjected to low water potential by withholding water to compare their modes of adaptation to water-limited conditions. Leaf CO2 exchange rate (CER), leaf diffusive conductance to CO2 (g
-
12. Presynaptic effect of Erythrosin B at the frog neuromuscular junction: ion and photon sensitivity.
1. The anionic dye Erythrosin B increases quantal transmitter release from frog neuromuscular synapses. Experiments were performed to determine the role of ions and light in this presynaptic effect. 2. In calcium-free saline containing 1 mM-EGTA, Erythrosin B increased miniature end-plate potential (m.e.p.p.) frequency at a more rapid rate than in normal sal