Navegação Ciências Exatas e da Terra por Título
Resultados 3602-3621 de 5964
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Novas resinas produzidas com catalisadores metalocenicos
(1996) [Artigo de periódico]Este trabalho tem como objetivo apresentar uma revisão sobre os tipos de polímeros produzidos com a última geração de catalisadores do tipo Ziegler-Natta, conhecidos como catalisadores metalocênicos. Inúmeros trabalhos ... -
Nova urbanização fragmentada na região metropolitana de Porto Alegre: o caso de águas claras - Viamão/RS como exemplo de análise
(2013) [Artigo de periódico]As manifestações intraurbanas da globalização fragmentadora, chanceladas pelos agentes produtores do espaço urbano, que visam prioritariamente à reprodução do capital, condicionam a configuração da estrutura urbana em ... -
Novel 3D‑fower shaped KTaO3 perovskite for highly efcient photocatalytic and H2 generation ability
(2022) [Artigo de periódico]Treatment of industrial wastewater is one of the biggest challenges that mankind is facing today to prevent environmental pollution and its associated adverse efects on human health. Environmentalists across the world have ... -
Novel therapeutic mechanisms determine the effectiveness of lipid-core nanocapsules on melanoma models
(2016) [Artigo de periódico]Melanoma is a severe metastatic skin cancer with poor prognosis and no effective treatment. Therefore, novel therapeutic approaches using nanotechnology have been proposed to improve therapeutic effectiveness. Lipid-core ... -
A novel voltage-mode CMOS quaternary logic design
(2006) [Artigo de periódico]This brief presents a novel kind of voltage-mode CMOS design that uses multiple threshold voltage transistors and three power supply lines to implement quaternary logic gates, showing lower power dissipation and using less ... -
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 ...
