Sigma Term
Mostrando 1-12 de 21 artigos, teses e dissertações.
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1. Dark Energy and The Accelerating Universe: Conceptual Aspects and Observational Tests / Energia escura e aceleração do Universo: Aspectos conceituais e testes observacionais
In the last decade, the extraordinary progress of the astronomical observations (distances with supernovas, matter and cosmic background radiation (CBR) power spectrum, X-ray surface brightness of galaxy clusters, etc) associated with important theoretical developments turned Cosmology one of the most exciting frontiers of contemporary science. In this thesi
Publicado em: 2010
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2. Magnetized string cosmological model in cylindrically symmetric inhomogeneous universe with time dependent cosmological-term lambda
Cylindrically symmetric inhomogeneous magnetized string cosmological model is investigated with cosmological term lambda varying with time. To get the deterministic solution, it has been assumed that the expansion (theta) in the model is proportional to the eigen value sigma1 1 of the shear tensor sigmai j. The value of cosmological constant for the model is
Brazilian Journal of Physics. Publicado em: 2008-03
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3. Influência da medição de desempenho nos projetos seis sigma : estudos de caso.
Six Sigma and performance measurement are subjects under investigation for practical and academic purposes. In this way, Six Sigma Program is a remarkable continuous improvement program with exceptional results in short term accomplished by Six Sigma Projects. Like others improvement approaches, some factors can influence the results of these projects. Besid
Publicado em: 2007
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4. Universal curve of ionic conductivities in binary alkali tellurite glasses
The main objective of this work is to present an analysis and brief discussion of experimental ionic conductivity s data in the binary alkali tellurite system, including on 47 glasses that extend the ionic conductivity range by more than 14 orders of magnitude in a wide compositional range. A 'universal' behavior is obtained, using log sigma or log sigmaT vs
Brazilian Journal of Physics. Publicado em: 2006-09
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5. Os termos sigma do núcleon e da delta / Nucleon and Delta sigma-terms
O termo sigma do núcleon, $sigma_N$, pode ser extraído dos dados experimentais e permite testar teorias e modelos que buscam descrever os efeitos da quebra explícita de simetria quiral sobre o núcleon. A teoria de perturbação quiral é considerada atualmente a teoria efetiva da cromodinâmica quântica, sendo destinada a descrever o regime de baixas en
Publicado em: 2006
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6. ASPECTOS QUE FACILITAM OU DIFICULTAM A IMPLEMENTAÇÃO DA ABORDAGEM SEIS SIGMA EM UMA EMPRESA DO SETOR DE SERVIÇOS: O CASO DA TELEMAR / ASPECTS THAT FACILITATE OR COMPLICATE SIX SIGMA IMPLEMENTATION IN A SERVICE SECTOR COMPANY: THE TELEMAR CASE STUDY
In order to improve the performance of its activities, along years the organizations have been influenced by different quality boardings. Six Sigma has been being the quality boarding more commented in the lasts times and applied in an increasing number of companies, initially industrial and, more recently, in services companies. This work aims to reduce an
Publicado em: 2006
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7. Reatividade hormonal e ultra-estrutura do lobo ventral da prostata de ratos (Ratus norvegicus) submetidos ao uso cronico simultaneo de etanol e nicotina / Hormonal and ultrastructural reactivity of the ventral lobe of the prostate of rats (Rattus norvegicus) submitted to simultaneous long-term alcohol-nicotine treatment
o álcool e a nicotina têm ação prejudicial sobre o funcionamento da glândula prostática. Contudo, os mecanismos moleculares e celulares envolvidos nas alterações prostáticas, bem como suas correlações com a patogênese glandular permanecem desconhecidos. Assim, os objetivos do presente estudo foram caracterizar as alterações estruturais das cél
Publicado em: 2006
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8. Kinetic phase transition in the mixed-spin Ising model
In this work we studied a ferromagnetic mixed-spin Ising model including a single ion crystal-field term. The model system consists of two interpenetrating sublattices with spins sigma = 1/2 and S = 1. The spins sigma = 1/2 occupy the sites of one sublattice, their nearest-neighbours are spins S on the other sublattice, and vice versa. The system is in conta
Brazilian Journal of Physics. Publicado em: 2004-06
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9. Pion mass dependence of nucleon magnetic moments
The relevance of the pion mass, provenient from a term which explicitely breaks chiral symmetry in the Lagrangian, for nucleon magnetic moment in the frame work of the Skyrme model in two different versions: the usual one model and a modified one which includes a coupling to a light scalar meson field, the sigma s( Brazilian Journal of Physics. Publicado em: 2004-03
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10. Trehalose synthesis genes are controlled by the putative sigma factor encoded by rpoS and are involved in stationary-phase thermotolerance in Escherichia coli.
The rpoS (katF) gene of Escherichia coli encodes a putative sigma factor (sigma S) required for the expression of a variety of stationary phase-induced genes, for the development of stationary-phase stress resistance, and for long-term starvation survival (R. Lange and R. Hengge-Aronis, Mol. Microbiol. 5:49-59, 1991). Here we show that the genes otsA, otsB,
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11. Rates of change in quantitative traits from fixation of new mutations.
Expressions are derived for the response to directional selection for a quantitative trait that comes from fixation of new mutations in a finite population. For additive genes with a distribution of mutant gene effects symmetric about zero, the response from fixing mutations occurring in a single generation is 2 Ni sigma 2M/sigma, in which N is the effective
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12. Rapid resolution of ST elevation and prediction of clinical outcome in patients undergoing thrombolysis with alteplase (recombinant tissue-type plasminogen activator): results of the Israeli Study of Early Intervention in Myocardial Infarction.
Alteplase (recombinant tissue-type plasminogen activator (rt-PA)) was infused within four hours of onset of symptoms in 286 patients with acute myocardial infarction. Delayed coronary angiography was performed 72 hours after admission with coronary angioplasty if indicated. Electrocardiographic monitoring was continuous during the first hour of treatment. Th