Navegação Ciências Exatas e da Terra por Título
Resultados 3602-3621 de 5955
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Um novo algoritmo para a modelagem dinâmica de manipuladores flexíveis
(2002) [Artigo de periódico]Controlar de forma ativa estruturas flexíveis permanece um problema ainda em aberto, tendo sido objeto de muitas pesquisas, principalmente a partir dos anos oitenta. Apesar de existirem muitos trabalhos dedicados à modelagem ... -
Um novo horizonte de correlação para o triássico superior do Rio Grande do Sul
(2004) [Artigo de periódico]A new biozone - called Ictidosaur Assemblage Zone - is proposed to the Upper Triassic Caturrita Formation from Southern Brazil, based on the discovery of a distinct tetrapod association characterized by the presence of ... -
Um novo procedimento de síntese da zeólita A empregando argilas naturais
(2009) [Artigo de periódico]This work proposes the synthesis of zeolite A by IZA standard proceedures starting from a natural clay. The clay was used in its natural form and after calcination at 900oC. The resulting materials were characterized by ... -
Os novos dilemas da União Europeia
(2015) [Artigo de periódico] -
Os novos gauchos e seus novos enderecos : populacao e urbanizacao no Rio Grande do Sul
(1994) [Artigo de periódico] -
NTT infrared imaging of star cluster candidates towards the central parts of the Galaxy
(2003) [Artigo de periódico]We address the issue whether the central parts of the Galaxy harbour young clusters other than Arches, Quintuplet and the Nuclear Young Cluster. A large sample of centrally projected cluster candidates has been recently ... -
Ntt v, i, and gunn z colour-magnitude diagrams of liller 1 : a globular cluster as metal-rich as the inner bulge stellar population?
(1996) [Artigo de periódico]We carried out V RI and Gunn z observations of the obscured globular cluster Liller 1. The cluster is so reddened (Av ≈ 9.0) that it is at the detection limit in V. The RGB in I vs. (I–z) shows a strong curvature. Recalling ... -
Ntt vi photometry of the metal-rich and obscured bulge globular cluster terzan 5
(1996) [Artigo de periódico]We study the metal-rich bulge globular cluster Terzan 5 by means of VI colour-magnitude diagrams, with images obtained under exceptional seeing conditions (0.34"–0.50"). Differential reddening is important across the ... -
Nuclear activity and stellar population of a sample of interacting galaxies
(1999) [Artigo de periódico]In this paper we investigate the nuclear activity and stellar population in a sample of 27 physical galaxy pairs. Equivalent widths of absorption features are used to characterise the nuclear stellar population according ... -
Nuclear and extended spectra of NGC 1068-II. Near-infrared stellar population synthesis
(2010) [Artigo de periódico]We performed stellar population synthesis on the nuclear and extended regions of NGC 1068 by means of near-infrared spectroscopy to disentangle their spectral energy distribution components. This is the first time that ... -
Nuclear charm and bottom production : a comparison among high energy approaches
(2004) [Artigo de periódico]We calculate the nucleon and nuclear photoproduction cross sections for heavy quarks within the k⊥-factorization formalism, considering the current high energy approaches which include nuclear and saturation effects. Our ... -
Nuclear densities and the statistics of nucleonic constituents
(1994) [Artigo de periódico]In the quark model of the nucleon, the Fermi statistics of the elementary constituents can in6uence significantly the properties of multinucleon bound systems. In the Skyrme model, on the other hand, the basic quanta are ... -
Nuclear effects in J/psi hadroproduction
(1989) [Artigo de periódico]A phenomenological picture of the parton recombination model for shadowing at small values ofx is applied to hadron-nucleus J/psi production. Agreement with experimental data is obtained provided that a further suppression ... -
Nuclear exclusive vector meson photoproduction
(2004) [Artigo de periódico]We calculate the nuclear cross section for vector meson exclusive photoproduction within the QCD color dipole picture and in the Regge approach. For the former approach, we have considered the phenomenological saturation ... -
Nuclear heavy quark photoproduction in a saturation model
(2003) [Artigo de periódico]We calculate the nuclear inclusive and diffractive cross sections for heavy quark photoproduction within a phenomenological saturation approach. The nuclear cross section is obtained by the extension of the saturation model ... -
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 ...
