Anisotropies
Mostrando 13-24 de 44 artigos, teses e dissertações.
-
13. High-pT results from the STAR experiment at RHIC
High-pT measurements in relativistic heavy ion collisions provide a unique set of tools to investigate the early stages of the collision. In this paper we report the high-pT measurements of inclusive hadron spectra, azimuthal anisotropies and two particle correlations performed by the STAR detector for 200 GeV Au+Au, p+p and d+Au collisions at RHIC. The resu
Brazilian Journal of Physics. Publicado em: 2004-03
-
14. Alternative dark energy models: an overview
A large number of recent observational data strongly suggest that we live in a flat, accelerating Universe composed of ~ 1/3 of matter (baryonic + dark) and ~ 2/3 of an exotic component with large negative pressure, usually named Dark Energy or Quintessence. The basic set of experiments includes: observations from SNe Ia, CMB anisotropies, large scale struct
Brazilian Journal of Physics. Publicado em: 2004-03
-
15. Avaliação da anisotropia magnetica de filmes finos por ressonancia ferromagnetica
Magnetic anisotropies of thin films are analysed from Ferromagnetic Resonance spectra obtained for different orientations of the samples with respect to the applied magnetic field. An Fe monocrystalline film, a Co polycrystalline film, a Co/Pd multilayers set of films with Co layers 3, 4 and 6Å thick with 15Å Pd as spacer layers, and a set of granular Co-C
Publicado em: 2002
-
16. Low temperature static behavior of the two-dimensional quantum easy-axis Heisenberg model
We use the self-consistent harmonic approximation (SCHA) to study static properties of the two-dimensional quantum Heisenberg model with easy-axis anisotropy. We calculate the critical temperature as a function of the spin value, and compare with classical results. Specifically, we compare how the ratio of critical temperatures varies as a function of the sp
Brazilian Journal of Physics. Publicado em: 2000-06
-
17. Analise do problema de Krigagem da soma e da soma das Krigagens : estudo de caso
This work presents some thicknesses estimates in overlapped sedimentary sections. The adopted procedure consists of the accomplishment of kriging followed by weigthed corrections that provide mathematical consistency to the operation of thicknesses addition. These weigthed corrections are based on the proportions between: a) the thicknesses of the estimated
Publicado em: 1999
-
18. Influencia de anisotropia induzida e magnetostrição na magnetoimpedancia e em sua relaxação em fitas amorfas de FeCoSiB
Giant Magnetoimpedance (GMI) is a term coined to describe large and sensitive field induced changes in the high frequency impedance of soft magnetic materials. Since its recent discovery, GMI has attracted much attenction owing to the enormous perspectives in technological aplications, mainly as magnetic field sensors. The basic mechanism responsible for the
Publicado em: 1998
-
19. Influencia das anisotropias magneticas nos processos de magnetização de ligas amorfas
Measurements of initial magnetic susceptibility and initial magnetic permeability aftereffect were performed in a set of amorphous metallic ribbons of nominal composition FexCo75-xSi15B10 (2 £ x £ 40). The observed behaviors for the susceptibility curves as a function of the external agents applied in the samples (tensile stresses, DC magnetic field, therm
Publicado em: 1992
-
20. Anisotropias induzidas em ligas ferromagnéticas amorfas / Induced anisotropy in amorphous ferromagnetic alloys
In this thesis we will present a series of studies related to induced magnetic anisotropies (Kind) in amorphous alloys. In order to get a more general view of this theme, we used several different kinds of annealings. The theoretical analysis of the data of Kind and magnetic after-effect (MAE) was performed using a model based on two-level systems (TLS). Fro
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/03/1991
-
21. Estudo sobre a transferibilidade intermolecular de parametros eletro-oticos relacionados com as intensidades das bandas fundamentais no infra-vermelho de moleculas em fase gasosa
The transferability of polar tensors and other related quantities was investigated for the F2CO, F2CS, Cl2CO and Cl2CS molecules. Computational programs were used to obtain the experimental (Program TPOLAR) and theoretical (Program CNDO/2) polar tensors. The validity of previously reported empirical equations for these molecules, was examined. Transferabilit
Publicado em: 1984
-
22. Pump-probe anisotropies of Fenna-Matthews-Olson protein trimers from Chlorobium tepidum: a diagnostic for exciton localization?
Exciton calculations on symmetric and asymmetric Fenna-Matthews-Olson (FMO) trimers, combined with absorption difference anisotropy measurements on FMO trimers from the green bacterium Chlorobium tepidum, suggest that real samples exhibit sufficient diagonal energy disorder so that their laser-excited exciton states are noticeably localized. Our observed ani
-
23. Restricted motion of photoexcited bacteriorhodopsin in purple membrane containing ethanol.
The molecular motion of retinal within the purple membrane was investigated by flash-induced absorption anisotropies with or without ethanol. In the absence of ethanol, the measured anisotropies at several wavelengths exhibited almost the same slow decay. This slow decay was attributed to only the rotation of purple membrane sheet itself in the aqueous suspe
-
24. Resolution of multiphasic reactions by the combination of fluorescence total-intensity and anisotropy stopped-flow kinetic experiments.
Multiphasic kinetics are often observed in stopped-flow investigations. To characterize further these kinetic phases, we have developed a methodology whereby fluorescence total intensity and anisotropy stopped-flow data can be combined in a single analysis. Fluorescence total intensity and anisotropy are highly interrelated and contain two very complementary