Navegação Ciências Exatas e da Terra por Título
Resultados 5740-5759 de 5964
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Underlying event properties in pp collisions at √s = 13 TeV
(2020) [Artigo de periódico]This article reports measurements characterizing the Underlying Event (UE) associated with hard scatterings at midrapidity (|η| < 0.8) in pp collisions at √s = 13 TeV. The hard scatterings are identified by the leading ... -
Underscreened Kondo lattice model applied to heavy fermion uranium compounds
(2007) [Artigo de periódico]We present theoretical results for the underscreened Kondo lattice model with localized S=1 spins coupled to a conduction band through a Kondo coupling, JK, and interacting among them ferromagnetically. We use a fermionic ... -
Understanding the cool DA white dwarf pulsator G29-38
(1998) [Artigo de periódico]The white dwarfs are promising laboratories for the study of cosmochronology and stellar evolution. Through observations of the pulsating white dwarfs, we can measure their internal structures and compositions, critical ... -
Understanding the two-dimensional ionization structure in luminous infrared galaxies : a near-IR integral field spectroscopy perspective
(2015) [Artigo de periódico]We investigate the two-dimensional excitation structure of the interstellar medium (ISM) in a sample of luminous infrared galaxies (LIRGs) and Seyferts using near-IR integral field spectroscopy. This study extends to the ... -
Une generalisation de l'invariant de malgrange
(1992) [Artigo de periódico] -
Un enfoque epistemológico de la enseñanza de la física : una contribución para el aprendizaje significativo de la física, con muchas cuestiones sin respuesta
(2010) [Artigo de periódico]Este trabajo relata un estudio de caso con un profesor de Física de enseñanza secundaria cuyas concepciones epistemológicas, ya identificadas en dos estudios anteriores, fueron consideradas claramente concordes con las ... -
Unfolding of antiferromagnetic phases and multicritical points in a two-orbital model for uranium compounds under pressure and magnetic field
(2020) [Artigo de periódico]We investigate the occurrence of multicritical points under pressure and magnetic field in a model that describes two 5 f bands (of either α or β characters), which hybridize with a single itinerant conduction band. The 5 ... -
Unhealthy food commercials on brazilian TV
(2016) [Artigo de periódico]Determining and monitoring the amount of unhealthy food commercials on TV is relevant to the prevention and control of obesity. The aim of this study was to determine the proportion of unhealthy food commercials on Brazilian ... -
A unidade (divisao) da geografia e o sentido da pratica
(1995) [Artigo de periódico] -
Unified formulation for inhomogeneity-driven instabilities in the lower-hybrid range
(2002) [Artigo de periódico]A local dispersion relation that describes inhomogeneity-driven instabilities in the lower-hybrid range is derived following a procedure that correctly describes energy exchange between waves and particles in inhomogeneous ... -
Unified line profiles for hydrogen perturbed by collisions with protons : satellites and asymmetries
(2015) [Artigo de periódico]We present new calculations of unified line profiles for hydrogen perturbed by collisions with protons. We report on new calculations of the potential energies and dipole moments which allow the evaluation of profiles for ... -
Uniform detection of the pre-main-sequence population in the five embedded clusters related to the HII region NGC2174 (Sh2-252)
(2011) [Artigo de periódico]We investigate five embedded clusters (ECs) and the extended stellar group itself of the prominent HII region NGC2174 (Sh2-252), which presents scarce and heterogeneous information coming from the optical and infrared. ... -
Unique ergodicity of interval exchange maps
(1992) [Artigo de periódico]Necessary and suffi cient conditions are given in order that an in terval excha.nge map satisfying Keane's infinite a.nd di stinct orbit COlldition be uniquely ergodi c. This is done through the dcvelopment of a t heory ... -
Uniqueness of the functional approach
(1980) [Artigo de periódico]It is shown that the phase-space Schwinger equations can only be appropriately formulated in terms of a specific discrete procedure. Nevertheless, the solutions to Schwinger equations turn out to be independent of the ... -
Unitarity boundary for deep inelastic structure functions
(1996) [Artigo de periódico]In this letter we derive the unitarity boundaries in QCD for the deep inelastic structure function in low x kinematic region: the Froissart boundary and a more restricted one, linked with experiment and based on additional ... -
Unitarity corrections to the structure functions through the dipole picture
(2002) [Artigo de periódico]We study the dipole picture for the description of deep inelastic scattering, focusing on the structure functions which are driven directly by the gluon distribution. One performs estimates using the effective dipole cross ... -
Unitary corrections to the Drell-Yan process in the target rest frame
(2002) [Artigo de periódico]The unitarity correction effects encoded in the Glauber-Mueller approach are taken into account to calculate the differential cross sections in the Drell-Yan process in the rest frame. A detailed study of the Drell-Yan ... -
Universality and quantum criticality of the one-dimensional spinor Bose gas
(2018) [Artigo de periódico]We investigate the universal thermodynamics of the two-component one-dimensional Bose gas with contact interactions in the vicinity of the quantum critical point separating the vacuum and the ferromagnetic liquid regime. ... -
Universality class of quantum criticality for strongly repulsive spin-1 bosons with antiferromagnetic spin-exchange interaction
(2012) [Artigo de periódico]Using the thermodynamic Bethe ansatz equations we study the quantum phase diagram, thermodynamics, and criticality of one-dimensional (1D) spin-1 bosons with strongly repulsive density-density and antiferromagnetic ... -
Universality of political corruption networks
(2022) [Artigo de periódico]Corruption crimes demand highly coordinated actions among criminal agents to succeed. But research dedicated to corruption networks is still in its infancy and indeed little is known about the properties of these networks. ...
