Bound States
Mostrando 13-24 de 313 artigos, teses e dissertações.
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13. Espectro de excitação para modelos de teorias quânticas de campo na rede: modelos puramente fermiônicos e modelos de cromodinâmica quântica / Excitation spectrum for quantum field theory models on the lattice: pure fermionic models and quantum chromodynamics models
In this thesis, we obtain, from a mathematically rigorous point of view, the low-lying energy-momentum spectrum of two $3+1$ dimensional imaginary time lattice quantum filed theory with fermion fields (we give explicit results for the case $d = 3$ and Dirac matrices): a pure fermionic model with quartic interaction in the $N$-component fermion field and a qu
Publicado em: 2008
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14. Myxomycetes ocorrentes em microhabitates especiais em Ãreas de Floresta AtlÃntica no Nordeste do Brasil: espÃcies florÃcolas / Floricolous myxomycete biota of four Atlantic Forest conservation units in the states of Pernambuco and ParaÃba; Northeast Brazil
Studies on myxomycetes are focused mainly on lignicolous; foliicolous; and corticicolous species; and many types of substrates and environments are still unexplored. Recent research carried out in moist forests suggests high diversity of species in inflorescences of large tropical herbs. This study aimed to increase the knowledge about the Neotropical distri
Publicado em: 2008
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15. Acordos internacionais sobre a produção compartilhada de recursos naturais: a unitização interestatal na área do petróleo e gás sob o enfoque constitucional brasileiro
The apportionment of natural resources between sovereign States is a subject that relates many aspects of International law, as long as Constitutional Law, at the execution and application phases of international treaties that regulates the exploration of common goods. In this sense, because of their natural characteristics that creates an environment of con
Publicado em: 2008
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16. Quebra de simetria de cargas em estruturas eletrônicas blindadas
In this thesis, we will study the screening phenomenon in electronic structures based on a charge symmetry breaking model. For a Thomas-Fermi potential exp(qr)=r, this theory predicts that the nuclear charge , in the ground state of the screened Hydrogen atom, is degenerated ! (; ), giving rise to a dual charge in the electron wavefunction. In this
Publicado em: 2008
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17. A mediação de conflitos em meio hospitalar e o direito fundamental à saúde
The current conception of health was first acknowledged mainly from the elaboration of Human Rights Universal Declaration and the creation of the World Health Organization, after the two world wars, thus much broader than the definition that once characterized health as the absence of diseases. The World Health Organization WHO - promulgated its Constitution
Publicado em: 2007
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18. Quantum transport of electrons through a parallel-coupled triple quantum-dot molecule
In this article we study the electronic transport through a triple quantum-dot molecule parallel-coupled to leads under a magnetic field. Analytical expressions are obtained for both the conductance and total density of states for the molecule in equilibrium at zero temperature. As a result of quantum interference of resonances belonging to different channel
Brazilian Journal of Physics. Publicado em: 2006-09
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19. IMPLANTAÇÃO DA ESPECTROSCOPIA DE IMPACTO DE ELETRONS DE LIMIARES
Molecular studies using near threshold excitation electron impact allow to investigating several states such as weakly-bound Rydberg states of high angular momentum. Threshold electron studies also are useful to determine lifetimes of autoionising states by measuring the apparent shifts in the energy caused by postcollision interaction (PCI) between the ejec
Publicado em: 2006
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20. "Study of the Elastic Scattering Between Nuclei Light Heavy Radioactive Stable" / "Estudo do Espalhamento Elástico Entre Núcleos Pesados Leves Estáveis e Radioativos"
The angular distributions of the elastic scattering for the 12C+28Si and 6He+27Al systems have been measured, in energies close to the Coulomb barrier. For the 12C+28Si system the data were obtained at energies Ec.m. = 12.4 - 25.2MeV and to 6He+27Al system were measured four energies Elab = 9.5, 11, 12 and 13.4MeV. The analysis of the angular distributions w
Publicado em: 2006
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21. Orbital picture in molecular inner-shell excited states of Rydberg-valence mixed character
The core-to-sigma* excited state is repulsive for the bond elongation; on the other hand, the core ionized state and the core-to-pi* state are bound and the core-to-Rydberg states are almost parallel to the potential energy curve of the core ionized state. Thus, the core-electron excitation to the unoccupied sigma* orbital can be mixed with the one-electron
Brazilian Journal of Physics. Publicado em: 2005-12
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22. As organizações de suporte suportam ou são suportadas pelas redes interorganizacionais?
The aim of this work is to discuss the actual role played by Public and Para Public institutions (SEBRAE, State and Municipal secretaries, national agencies, departments, public universities, etc.) when supporting interorganizational networks. In order to reach this objective, an empirical research was carried out so that concrete evidences of the management
Publicado em: 2005
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23. Towards new states of matter
A linear realization of flavor SU (3) × SU (3) symmetry is developped with scalar and pseudoscalar mesons coupled to baryons and massive vector fields. This system may be also coupled to colored quarks and gluons, which are expected to be deconfined above a critical range of energy densities and seemingly inside baryons. The coupling to vector fields may le
Brazilian Journal of Physics. Publicado em: 2004-09
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24. Nuclear reaction studies with exotic boron beams
Spectroscopic investigation, on exotic nuclei, performed in two different experiments with secondary radioactive boron beams are discussed. Spectroscopic factors for the 13B+n bound-states are obtained by measuring momentum distribution of the 13B residual nucleus from knockout reaction of the 14B beam at intermediate energy. The momentum distributions are m
Brazilian Journal of Physics. Publicado em: 2004-09