Ground State Bound State
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. Sobre um Sistema do tipo Schrödinger-Poisson
Nesta dissertação, estudaremos a existência de dois tipos de soluções fracas não negativas para uma classe de problemas do tipo Schrödinger-Poisson, os quais modelam fenômenos físicos, por exemplo, em Mecânica Quântica. Inicialmente, encontraremos através de argumentos de minimização, do Lema Splitting e do Princípio Variacional de Ekeland, um
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/04/2012
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2. LINGUÍSTICA E ENSINO: O DISCURSO DE ENTREMEIO NA FORMAÇÃO DE PROFESSORES DE LÍNGUA PORTUGUESA / LINGUISTICS AND TEACHING: THE MIDDLE-GROUND DISCOURSE IN PORTUGUESE LANGUAGE TEACHERS TRAINING
This study aims at investigating how and which theoretical aspects of linguistics are effective for implementing a Letters course directed across the educations of Portuguese language teachers. This doctoral dissertation is anchored to a theoretical-methodological perspective of the French discourse analysis which dialogues with the History of Linguistic Ide
Publicado em: 2010
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3. 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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4. Weak decay constant of pseudoscalar mesons in a QCD-inspired model
We show that a linear scaling between the weak decay constants of pseudoscalars and the vector meson masses is supported by the available experimental data. The decay constants scale as f m/f p = MV/Mr (f m decay constant and M V vector meson ground state mass). This simple form is justified within a renormalized lightfront QCD-inspired model for quark-antiq
Brazilian Journal of Physics. Publicado em: 2004-03
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5. Circular Polarization of Fluorescence of Probes Bound to Chymotrypsin. Change in Asymmetric Environment upon Electronic Excitation*
The circular polarization of fluorescence is related to the conformational asymmetry of the emitting molecule in the first singlet excited state in the same way that circular dichroism is related to the conformational asymmetry of the absorbing molecule in the electronic ground state. By measurement of these optical phenomena, the induced asymmetry of two ch
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6. Molecular dynamic study of orotidine-5′-monophosphate decarboxylase in ground state and in intermediate state: A role of the 203–218 loop dynamics
Molecular dynamics simulations have been used to derive the structures of ground (orotidine-5′-monophosphate decarboxylase⋅orotidine 5′-monophosphate; ODC⋅OMP) and intermediate (ODC⋅intermediate; ODC⋅I−) states in the ODC-catalyzed decarboxylation of OMP. For comparison, a molecular dynamics simulation of the conformers of OMP dissolved in wate
The National Academy of Sciences.
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7. Influence of the triplet excited state on the photobleaching kinetics of fluorescein in microscopy.
The investigation in this report aimed at providing photophysical evidence that the long-lived triplet excited state plays an important role in the non-single-exponential photobleaching kinetics of fluorescein in microscopy. Experiments demonstrated that a thiol-containing reducing agent, mercaptoethylamine (MEA or cysteamine), was the most effective, among
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8. Are helionitronium trications stable?
In a recent article [Olah, G. A., Prakash, G. K. S. & Rasul, G. (1999) Proc. Natl. Acad. Sci. USA 96, 3494–3495] the authors found that the helionitronium trication, HeNO\documentclass[10pt]{article} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{pmc} \usepackage
National Academy of Sciences.
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9. An unusual pathway of excitation energy deactivation in carotenoids: Singlet-to-triplet conversion on an ultrafast timescale in a photosynthetic antenna
Carotenoids are important biomolecules that are ubiquitous in nature and find widespread application in medicine. In photosynthesis, they have a large role in light harvesting (LH) and photoprotection. They exert their LH function by donating their excited singlet state to nearby (bacterio)chlorophyll molecules. In photosynthetic bacteria, the efficienc
The National Academy of Sciences.
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10. An upper bound for the number of electrons in a large ion
Let E(Z, N) be the ground-state energy of N quantized electrons and a single nucleus of charge Z. For fixed Z, E(Z, N) is independent of N for N ≥ Ncritical(Z). Physically, this means that at most Ncritical electrons can bind to the nucleus. We prove that Ncritical ≤ Z + CZa with a = 0.84.
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11. Time-resolved fluorescence study of the single tryptophans of engineered skeletal muscle troponin C.
The regulatory domain of troponin C (TnC) from chicken skeletal muscle was studied using genetically generated mutants which contained a single tryptophan at positions 22, 52, and 90. The quantum yields of Trp-22 are 0.33 and 0.25 in the presence of Mg2+ (2-Mg state) and Ca2+ (4-Ca state), respectively. The large quantum yield of the 2-Mg state is due to a r
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12. AlF3 mimics the transition state of protein phosphorylation in the crystal structure of nucleoside diphosphate kinase and MgADP
Nucleoside diphosphate kinase reversibly transfers the γ-phosphate of ATP onto its active site histidine. We have investigated the transition state of histidine phosphorylation with the high-resolution crystal structures of the enzyme from Dictyostelium discoideum with MgADP and either aluminium or beryllium fluoride. The bound aluminium fluoride species is
The National Academy of Sciences of the USA.