Navegação Ciências Exatas e da Terra por Título
Resultados 3622-3641 de 5964
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A nuclear ionized gas outflow in the Seyfert 2 galaxy UGC 2024
(2019) [Artigo de periódico]As part of a high-resolution observational study of feeding and feedback processes occurring in the vicinity of the active galactic nucleus in 40 galaxies, we observed the inner 3′′.5 × 5 arcsec of the nearby spiral and ... -
Nuclear kinematics in nearby AGN-I. An ALMA perspective on the morphology and kinematics of the molecular CO(2–1) emission
(2019) [Artigo de periódico]We present the molecular gas morphology and kinematics of seven nearby Seyfert galaxies obtained from our 230 GHz ALMA observations. The COJ = 2−1 kinematics within the inner ∼30 arcsec (≲9 kpc) reveals rotation patterns ... -
Nuclear modification factor in small system collisions within perturbative QCD including thermal effects
(2022) [Artigo de periódico]In this paper, the nuclear modification factors, RxA, are investigated for pion production in small system collisions, measured by PHENIX experiment at RHIC (Relativistic Heavy Ion Collider). The theoretical framework is ... -
Nuclear modification factor of light neutral-meson spectra up to high transverse momentum in p–Pb collisions at √sNN = 8.16 TeV
(2022) [Artigo de periódico]Neutral pion (π0) and η meson production cross sections were measured up to unprecedentedly high transverse momenta (pT) in p–Pb collisions at √sNN = 8.16 TeV. The mesons were reconstructed via their two-photon decay channel ... -
Nuclear modification of Y states in pPb collisions at √snn = 5.02 TeV
(2022) [Artigo de periódico]Production cross sections of Υ(1S), Υ(2S), and Υ(3S) states decaying into μ+μ− in proton-lead (pPb) collisions are reported using data collected by the CMS experiment at √sNN = 5.02 TeV. A comparison is made with corresponding ... -
Nuclear Morphometric Analysis (NMA) : screening of senescence, apoptosis and nuclear irregularities
(2012) [Artigo de periódico]Several cellular mechanisms affect nuclear morphology which can therefore be used to assess certain processes. Here, we present an analytic tool to quantify the number of cells in a population that present characteristics ... -
Nuclear-quadrupole interactions in perovskite-type compounds of hf/sup 181/ studied by the perturbed-angular-correlation technique
(1972) [Artigo de periódico]Measurements of nuclear-quadrupole-interaction constants in perovskite-type compounds of PbHf03, SnHf03, CaHf03, and SrHf03 have been performed using the perturbed-angularcorrelation technique. A range of fundamental ... -
Nuclear relaxation in (nh/sub 4/)/sub 3/hff/sub 7/ studied by gamma-gamma angular correlation
(1970) [Artigo de periódico]Measurements of the perturbed angular correlation have been made for the first 5/2+ excited statc of Ta181 in (NH4) 3HfF7 in arder to solve a controversial question related to the structure of the complex Hf7 this compound. ... -
Nuclear rings in active galaxies
(1996) [Artigo de periódico]We investigate two current problems in active galactic nuclei-the mode of fueling the putative black hole, and the question of whether the circumnuclear regions have experienced unusual chemical processing-by studying the ... -
Nuclear spirals as feeding channels to the supermassive black hole : the case of the galaxy NGC 6951
(2007) [Artigo de periódico]We report the discovery of gas streaming motions along nuclear spiral arms toward the LINER nucleus of the galaxyNGC 6951. The observations, obtained using theGMOS integral field spectrograph on the Gemini North telescope, ... -
Numerical evidence of Janssen-Oerding's prediction in a three-dimensional spin model far from equilibrium
(2022) [Artigo de periódico]In 1994, Jansen and Oerding predicted an interesting anomalous tricritical dynamic behavior in threedimensional models via renormalization group theory. However, we highlight the lack of literature about the computational ... -
Numerical model of electromagnetic stirring for continuos casting billets
(2002) [Artigo de periódico]Thispaperintroducesanumericalmodelofanelectromagnetic rotary stirrer based on the finite-element model.Such stirrers are used to improve the quality of continuously cast steel, particularly billets and blooms. The method ... -
Numerical renormalization-group study of the correlation functions of the antiferromagnetic spin 1/2 Heisenberg chain
(1995) [Artigo de periódico]We use the density-matrix renormalization-group technique developed by White to calculate the spin correlation functions (S2n+I S2n)=(-1) 1 w(l,N) for isotropic Heisenberg rings up to N=70 sites. The correlation functions ... -
Numerical simulation of a negative ion plasma expansion into vacuum
(1997) [Artigo de periódico]The expansion into vacuum of a one-dimensional, collisionless, negative ion plasma is investigated in the framework of the Vlasov–Poisson model. The basic equations are written in a ‘‘new time space’’ by use of a rescaling ... -
Numerical simulation of bidimensional incompressible flows between moving surfaces
(2001) [Artigo de periódico]The goal of the present work is the numerical simulation of flows betwen moving surfaces. The method is based on the finite differences explicit Runge-Kutta multi-stage scheme with central spatial discretization and for ... -
Numerical simulations with the Galerkin least squares finite element method for the Burgers' equation on the real line
(2017) [Artigo de periódico]In this work we present an efficient Galerkin least squares finite element scheme to simulate the Burgers’ equation on the whole real line and subjected to initial conditions with compact support. The numerical simulations ... -
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Nutrient release, plant nutrition, and potassium leaching from polymer-coated fertilizer
(2017) [Artigo de periódico]The increase in food consumption and limitations in food production areas requires improved fertilizer efficiency. Slow- or controlled-release fertilizers are an alternative for synchronizing nutrient availability with the ... -
Nutritional composition of Eragrostis teff and its association with the observed antimutagenic effects
(2019) [Artigo de periódico]Eragrostis teff is an Ethiopian native grass plant ( Poaceae or Gramineae family) whose importance as a crop grain has increased in recent years. The aim of this study is to analyze the nutritional composition of its seeds ... -
Nutrition, mental health and violence : from pregnancy to postpartum cohort of women attending primary care units in southern Brazil - ECCAGE study
(2010) [Artigo de periódico]Background: Woman’s nutritional status, before and during pregnancy, is a strong determinant of health outcomes in the mother and newborn. Gestational weight gain and postpartum weight retention increases risk of overweight ...
