Dipole Dipole Coupling
Mostrando 1-12 de 31 artigos, teses e dissertações.
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1. Ultrafast Dynamics of Au Nanopyramid Interfaces Prepared by Nanosphere Lithography: Effect of Substrate Chemical Composition
This work describes ultrafast spectroscopy studies of Au triangular pyramid particle arrays deposited over glass (termed Au/glass), and 190 nm indium tin oxide (ITO) film (termed Au/ITO/glass) prepared by nanosphere lithography. The linear absorption spectra of Au/glass and Au/ITO/glass exhibit surface plasmon resonances at 800 and 870 nm, respectively, in g
J. Braz. Chem. Soc.. Publicado em: 2016-02
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2. Investigação teórica da quimisssorção do ânion metanossulfonato em eletrodos de platina (111) e (100) via método semi-empírico
Several electrochemical processes, such as electrocatalysis of organic substrates, make use of mediators. One of the mediators is the most commonly used anion methanesulfonate, CH3SO3, which has several advantages for such use, and chemical stability considered one of them. However, experimental studies indicate the possibility of this compound suffer the ad
Publicado em: 2010
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3. Berry's phase in the two-level model
We study the adiabatic evolution of a two-level model in the presence of an external classical electric field. The coupling between the quantum model and the classical field is taken in the electric dipole approximation. In this regime, we show the absence of geometric phases in the interacting two-level model in the presence of any periodic real time-depend
Brazilian Journal of Physics. Publicado em: 2009-06
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4. Dipole scattering amplitude in momentum space: investigating fluctuations at HERA
We extend a recently proposed dipole model which relates the virtual photon-proton cross section to the dipole-proton forward scattering amplitude in momentum space investigating the effects of the gluon number fluctuations. The model interpolates between well known asymptotic behaviours predicted by perturbative QCD from the Balitsky-Kovchegov equation, whi
Brazilian Journal of Physics. Publicado em: 2008-09
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5. VÃrtices NÃo-Abelianos com Acoplamento NÃo-MÃnimo em um Background Gravitacional
The main purpose of this thesis is to investigate how the non-Abelian gauge symmetry affects the solutions of the equations of motion in some field theory models. We concern ourselves specifically with three dimensional field theories. We will note here that planar systems give us the needed informations about the theories approached here. Topological defect
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/07/2005
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6. Theoretical investigations on valence vibronic transitions
This article reviews previously employed methods to study several valence electronic transitions, optically forbidden or not, enhancing intensity through vibronic coupling. Electronic transition dipole moments were calculated using several ab initio methods including electron correlation. In this method the square of the electronic transition dipole moments
Brazilian Journal of Physics. Publicado em: 2005-12
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7. Aplicações de antenas inteligentes e equalização concorrente em sistemas WCDMA/HSDPA / Applications of smart antennas and concurrent equalization on WCDMA/HSDPA systems
This dissertation investigates and proposes different algorithms for smart antennas and channel equalization aiming at WCDMA HSDPA downlink receivers. Considering the channel equalization issue, we propose an adaptive back-propagation algorithm with concurrent sub-systems. This equalization technique exploits particular characteristics of a WCDMA downlink si
Publicado em: 2004
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8. Intensities of 4f-4f transitions in glass materials
In this article we review some of the basic aspects of rare earth spectroscopy applied to vitreous materials. The characteristics of the intra-atomic free ion and ligand field interactions, as well as the formalisms of the forced electric dipole and dynamic coupling mechanisms of 4f-4f intensities, are outlined. The contribution of the later mechanism to the
Química Nova. Publicado em: 2003-12
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9. The influence of the Pacific and Atlantic ssts in the South America monsoon rainfall / A influência das TSMS dos ocenos Pacíficos e Atlântico nas chuvas de monção da América do Sul
Monthly information of outgoing long wave radiation (OLR), sea surface temperature (SST), and rainfall from 22 meteorological stations in eastern South America were used to identify the rainfall characteristics of the South American Monsoon systems (SAMS). The 1961-1999 rainfall climatology for the area allowed the identification of two seasons with marked p
Publicado em: 2000
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10. Estrutura nuclear e competição entre modos de decaimento de ressonancia gigantes
The low-lying leveI structure of the odd-mass Pb isotopes ( 193A205) is investigated in terms of the projected BCS approximation (PBCS) with one- and three- quasiparticle. A surface delta interaction (SDI) is used as residual interaction. Excitation energies, spectroscopic factors magnetic dipole and electric quadrupole moments are calculated and compared wi
Publicado em: 1997
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11. Transition dipole coupling in Amide I modes of βpolypeptides
Our previous introduction of transition dipole coupling helped to explain the splittings in the Amide I modes of antiparallel chain pleated sheet polyglycine I. This mechanism has now been applied to the more likely rippled sheet structure of this polypeptide as well as to the pleated sheet structure of poly(L-alanine). A satisfactorily consistent explanatio
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12. Zero-quantum frequency-selective recoupling of homonuclear dipole-dipole interactions in solid state nuclear magnetic resonance
We describe a method for measuring magnetic dipole-dipole interactions, and hence distances, between pairs of like nuclear spins in a many-spin system under magic-angle spinning (MAS). This method employs a homonuclear dipolar recoupling sequence that creates an average dipole-dipole coupling Hamiltonian under MAS with full zero-quantum symmetry, including b
U.S. Government.