Navegação Ciências Exatas e da Terra por Título
Resultados 1067-1086 de 5972
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Coupled dynamics of interacting spin-1 bosons in a double-well potential
(2018) [Artigo de periódico]We present a detailed analysis of dynamical processes involving two or three particles in a double-well potential. Motivated by experimental realizations of such a system with optically trapped cold atoms, we focus on ... -
Coupled ion acoustic and drift waves in magnetized superthermal electron-positron-ion plasmas
(2014) [Artigo de periódico]Linear and nonlinear coupled drift-ion acoustic waves are investigated in a nonuniform magnetoplasma having kappa distributed electrons and positrons. In the linear regime, the role of kappa distribution and positron content ... -
Coupling between ion-acoustic waves and neutrino oscillations
(2017) [Artigo de periódico]The work investigates the coupling between ion-acoustic waves and neutrino flavor oscillations in a nonrelativistic electron-ion plasma under the influence of a mixed neutrino beam. Neutrino oscillations are mediated by ... -
Coupling of fermions to the three-dimensional noncommutative CP/sup N-1/ model : minimal and supersymmetric extensions
(2004) [Artigo de periódico]We consider the coupling of fermions to the three-dimensional noncommutative CPN21 model. In the case of minimal coupling, although the infrared behavior of the gauge sector is improved, there are dangerous ~quadratic! ... -
Coupling of low-frequency modes with the complex ginzburg-landau equation : generalized zakharov equations
(1999) [Artigo de periódico]In this paper we introduce and examine a generalization of the complex Ginzburg-Landau equation (CGLE) where the self-interaction contained in the cubic term is replaced by a coupling involving the original field and a ... -
COVID-19 among healthcare workers in a Southern Brazilian Hospital and evaluation of a diagnostic strategy based on the RT-PCR test and retest for Sars-CoV-2
(2021) [Artigo de periódico]OBJECTIVE: Healthcare workers are at risk for COVID-19 contamination. It is important to protect them in order to reduce nosocomial transmission and maintain the assistance capacity of health systems. To evaluate the ... -
Cratering and plastic deformation in polystyrene induced by MeV heavy ions : dependence on the molecular weight
(2001) [Artigo de periódico]Cratering and plastic deformation induced by individual MeV ions on the surface of polystyrene thin films of different molecular weights (Mw) (from 3250 to 2 X 10⁷u) are investigated using scanning force microscopy. 20 ... -
Cratering induced by slow highly charged ions on ultrathin PMMA films
(2022) [Artigo de periódico]Highly charged ions are a well-known tool for the nanostructuring of surfaces. We report on the thickness dependence of nanostructures produced by single 260 keV Xe38+ ions on ultrathin poly(methyl methacrylate) (PMMA) ... -
Criação de conteúdos educacionais em busca da mobilidade e ubiquidade
(2011) [Artigo de periódico]Atualmente, diferentes são as possibilidades para acessar conteúdos educacionais tais como recursos na Web, documentos em bibliotecas digitais, dispositivos móveis e, inclusive, TV digital. As tecnologias e o advento da ... -
Criação do Instituto de Matemática da UFRGS
(1989) [Artigo de periódico] -
Criação do Museu do Instituto de Química da Universidade Federal do Rio Grande do Sul UFRGS
(2022) [Artigo de periódico]Este artigo aborda a criação do Museu do Instituto de Química (MIQ) da Universidade Federal do Rio Grande do Sul (UFRGS), propondo a problematização acerca dos desafios institucionais e do âmbito coletivo e social de ... -
A crise de recursos hídricos
(1999) [Artigo de periódico] -
Cristais líquidos ferroelétricos CLF : uma abordagem sintética
(2001) [Artigo de periódico]Synthetic methods used for the synthesis of the Ferroelectric Liquid Crystals (FLCs) will be considered with emphasis on the chiral synthesis methodologies and mesomorphic electrooptical properties. -
Critical and gaussian conductivity fluctuations in yba2cu3o7-delta
(1993) [Artigo de periódico]We report on systematic conductivity fluctuation measurements on three different samp1es of YBa2Cu30 7 - δ • We show, using the temperature derivative of the resistivity and the logarithmic derivative ofthe conductivity ... -
Critical behavior of self-assembled rigid rods on two-dimensional lattices : Bethe-Peierls approximation and Monte Carlo simulations
(2013) [Artigo de periódico]The critical behavior of adsorbed monomers that reversibly polymerize into linear chains with restricted orientations relative to the substrate has been studied. In the model considered here, which is known as self-assembled ... -
A critical evaluation of coastal erosion in Rio Grande do Sul, Southern Brazil
(2004) [Artigo de periódico]Evidências de erosão costeira no Rio Grande do Sul têm sido obtidas através de três métodos: (a) análises estratigráficas e morfodinâmicas de longo período de barreiras costeiras, (b) mapeamento anual da linha de costa ... -
Critical exponents of the disorder-driven superfluid-insulator transition in one-dimensional Bose-Einstein condensates
(2011) [Artigo de periódico]We investigate the nature of the superfluid-insulator quantum phase transition driven by disorder for noninteracting ultracold atoms on one-dimensional lattices. We consider two different cases: Anderson-type disorder, ... -
Criticality in confined ionic fluids
(2001) [Artigo de periódico]A theory of a confined two-dimensional electrolyte is presented. The positive and negative ions, interacting by a 1/r potential, are constrained to move on an interface separating two solvents with dielectric constants e1 ... -
CRL4-Cereblon complex in Thalidomide Embryopathy : a translational investigation
(2020) [Artigo de periódico]The Cereblon-CRL4 complex has been studied predominantly with regards to thalidomide treatment of multiple myeloma. Nevertheless, the role of Cereblon-CRL4 in Thalidomide Embryopathy (TE) is still not understood. Not all ...