Navegação Ciências Exatas e da Terra por Título
Resultados 5174-5193 de 5955
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Suppression of Λ (1520) resonance production in central Pb-Pb collisions at √sNN = 2.76 TeV
(2019) [Artigo de periódico]The production yield of the (1520) baryon resonance is measured at midrapidity in Pb-Pb collisions at √ sNN = 2.76 TeV with the ALICE detector at the Large Hadron Collider (LHC). The measurement is performed in the (1520) ... -
Surface modification of titanium by plasma nitriding
(2003) [Artigo de periódico]A systematic investigation was undertaken on commercially pure titanium submitted to plasma nitriding. Thirteen different sets of operational parameters (nitriding time, sample temperature and plasma atmosphere) were used. ... -
Surface morphology of spray-dried nanoparticle-coated microparticles designed as an oral drug delivery system
(2008) [Artigo de periódico]This paper was devoted to studying the influence of coating material (nanocapsules or nanospheres), drug model (diclofenac, acid or salt) and method of preparation on the morphological characteristics of nanoparticle-coated ... -
Surface photometry and spectral analysis of Mk50 : a Seyfert 1 nucleus in an early type galaxy
(1991) [Artigo de periódico]We analyze Markarian 50 using V and I CCD frames and IPCS and CCD spectra, respectively, obtained in June 1985 (low state of activity) and May 1990 (high state), covering the range 3200 Å<λ<10 100 Å. The surface brightness ... -
Surface temperature patterns of Lagoa dos Patos, Brazil, using NOAA-AVHRR data : an annual cycle analysis
(2010) [Artigo de periódico]A processing chain for NOAA-AVHRR data can be used to retrieve lake surface water temperatures (LSWT) measurements based on a nonlinear sea surface temperature (NLSST) algorithm generally applied to open ocean conditions. ... -
Surface tensions and surface potentials of acid solutions
(2010) [Artigo de periódico]A theory is presented which allows us to quantitatively calculate the excess surface tension of acid solutions. The H+, in the form of hydronium ion, is found to be strongly adsorbed to the solution-air interface. To account ... -
Surface water impacted by rural activities induces genetic toxicity related to recombinagenic events in vivo
(2016) [Artigo de periódico]This investigation assessed the interaction of surface water samples with DNA to quantitatively and qualitatively characterize their mutagenic and/or recombinagenic activity. Samples were obtained at three different sites ... -
Sur la densite des systemes de pfaff sans solution algebrique
(1994) [Artigo de periódico] -
A survey of early-type stars based on the Two Micron All Sky Survey database
(2007) [Artigo de periódico]We report the results of a spectroscopic survey of blue stars near the south Galactic pole, selected according to their color indices in the 2MASS database. The main scope of this work is to determine the nature of the ... -
A survey of GPU-Based volume rendering of unstructured grids
(2005) [Artigo de periódico]A visualização volumétrica de grandes malhas não estruturadas é uma das principais metas da comunidade de visualização científica. Enquanto que em grades regulares o uso de técnicas baseadas em textura são adequadas para ... -
A survey of the interstellar medium in early-type galaxies. III. Stellar and gas kinematics
(2000) [Artigo de periódico]We present gaseous and stellar kinematics for 14 gas-rich early-type galaxies. Half of the sample exhibit irregular gaseous velocity profiles ; gas/star counter-rotation is visible in Ðve galaxies. We also find five ... -
Survey of the ISM in early-type galaxies
(2002) [Artigo de periódico]We present mid-IR photometric properties for a sample of 28 early-type galaxies observed at 6.75, 9.63 and 15 m with the ISOCAM instrument on board the ISO satellite. We nd total mid-IR luminosities in the range (3−42) x ... -
Suscetibilidade do biodiesel de sebo bovino à biodegradação por pseudallescheria boydii
(2012) [Artigo de periódico]As características do biodiesel produzido podem afetar a sua suscetibilidade à biodegradação por ação microbiana, o que tem sido uma preocupação freqüente, pois leva a mudanças nas propriedades de combustível durante o ... -
"Sustancia" en el devenir la quimica : dime cómo te buscan y te diré que eres
(2009) [Artigo de periódico]Con base en planteamientos de Stephen Toulmin se presentan algunos aspectos del devenir histórico de la Química, en relación con el concepto sustancia. En un recorrido somero y no lineal, el texto intenta mostrar algunas ... -
A Swarm based approach to adapt the structural dimension of agents' organizations
(2005) [Artigo de periódico]One of the well studied issues in multi-agent systems is the standard action-selection problem where a goal task can be performed in di erent ways, by di erent agents. Also the sequence of these actions can in uence the ... -
S-wave meson-nucleon scattering in an su(3) cloudy bag model
(1985) [Artigo de periódico]The cloudy bag model (CBM) is extended to incorporate chiral SU(3)XSU(3) symmetry, in order to describe 5-wave KN and KN scattering. In spite of the large mass of the kaon, the model yields reasonable results once the ... -
Symmetry breaking in d-dimensional self-gravitating systems
(2013) [Artigo de periódico]Systems with long-range interactions, such as self-gravitating clusters and magnetically confined plasmas, do not relax to the usual Boltzmann-Gibbs thermodynamic equilibrium, but become trapped in quasistationary states ... -
Symmetry plane correlations in Pb–Pb collisions at √sNN = 2.76 TeV
(2023) [Artigo de periódico]A newly developed observable for correlations between symmetry planes, which characterize the direction of the anisotropic emission of produced particles, is measured in Pb–Pb collisions at √sNN = 2.76 TeV with ALICE. This ... -
Synthesis and characterization in solution and in the solid state of the palladium aryl bromide complexes [Pd(Ar)Br{(S)-BINAP}] : formation of cyclopalladated complexes and direct observation of a C-N reductive elimination to form heterocycles
(2004) [Artigo de periódico]As reações de uma mistura [Pd2(dba)3]/P(o-tolyl)3 (1/4) com brometos de arila orto substituídos conduziram aos dímeros [Pd(Ar)(m-Br){P(o-tolyl)3)}]2 que, após adição de 2 equiv. de (S)-BINAP formaram os complexos ... -
Synthesis and characterization of [Cd8Cl2Se(SePh)12(PCy3)2]•2.5CH3OH
(2010) [Artigo de periódico]Neste artigo estamos apresentando a síntese do composto [Cd8Cl2(μ4-Se)(SePh)12(PCy3)2]·2.5CH3OH pela reação de Cd(SePh)2 com CdCl2 e triciclohexilfosfina em metanol em um reator de aço inoxidável sob condições solvotérmicas ...
