Listar Ciencias Exactas y Naturales por título
Mostrando ítems 4537-4556 de 5974
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Saturation of the massive Schwinger model
(1980) [Artículo de periódico]We determine the field configurations saturating the massive Schwinger model (MSM). Fermion confinement is proved, for the MSM, without invoking the Bose form of the theory. A gas of induced instantons accounts for the ... -
Saturation physics at HERA and RHIC : an unified description
(2006) [Artículo de periódico]One of the frontiers of QCD which are intensely investigated in high energy experiments is the high energy (small x) regime, where we expect to observe the non-linear behavior of the theory. In this regime, the growth of ... -
SBCCI 99-XII on IC and systems design
(1999) [Artículo de periódico] -
Scaling laws for breathing frequencies of solitary modes in the Zakharov equations
(2002) [Artículo de periódico]We analyze typical time scales resulting from the coupled dynamics of high- and low-frequency wave components in solitary solutions of the Zakharov equations. Linear stability analysis around the solitary modes suggests ... -
Scaling violation and shadowing corrections at HERA
(1999) [Artículo de periódico]We study the value of shadowing corrections (SC) in the HERA kinematic region in the Glauber{ Mueller approach. Since the Glauber{Mueller approach was proven in perturbative quantum chromodynamics (QCD) in the double-logarithmic ... -
Sc and neutron-capture abundances in Galactic low- and high-α field halo stars
(2017) [Artículo de periódico]We determine relative abundance ratios for the neutron-capture elements Zr, La, Ce, Nd and Eu for a sample of 27 Galactic dwarf stars with −1.5 < [Fe/H] < −0.8. We also measure the iron-peak element Sc. These stars separate ... -
Scanning electron microscopy and machine learning reveal heterogeneity in capsular morphotypes of the human pathogen Cryptococcus spp.
(2020) [Artículo de periódico]Phenotypic heterogeneity is an important trait for the development and survival of many microorganisms including the yeast Cryptococcus spp., a deadly pathogen spread worldwide. Here, we have applied scanning electron ... -
Scattering studies with low-energy kaon-proton femtoscopy in proton-proton collisions at the LHC
(2020) [Artículo de periódico]The study of the strength and behavior of the antikaon-nucleon (¯KN) interaction constitutes one of the key focuses of the strangeness sector in low-energy quantum chromodynamics (QCD). In this Letter a unique high-precision ... -
Schema evolution in the star framework
(1998) [Artículo de periódico]The STAR data model supports the definition of object schemata, according either to some design methodology or to the designer's decision. Object schemata allow a flexible management of the various representations that are ... -
Scientometric indicators for Brazilian research on High Energy Physics, 1983-2013
(2017) [Artículo de periódico]This article presents an analysis of Brazilian research on High Energy Physics (HEP) indexed by Web of Science (WoS) from 1983 to 2013. Scientometric indicators for output, collaboration and impact were used to characterize ... -
Screening of spherical colloids beyond mean field : a local density functional approach
(2004) [Artículo de periódico]We study the counterion distribution around a spherical macroion and its osmotic pressure in the framework of the recently developed Debye-Hückel-hole-cavity (DHHC) theory. This is a local density functional approach which ... -
SDSS DR7 white dwarf catalog
(2013) [Artículo de periódico]We present a new catalog of spectroscopically confirmed white dwarf stars from the Sloan Digital Sky Survey (SDSS) Data Release 7 spectroscopic catalog. We find 20,407 white dwarf spectra, representing 19,712 stars, and ... -
SDSS-III : massive spectroscopic surveys of the distant universe, the Milk Way, and extra-solar planetary systems
(2011) [Artículo de periódico]Building on the legacy of the Sloan Digital Sky Survey (SDSS-I and II), SDSS-III is a program of four spectroscopic surveys on three scientific themes: dark energy and cosmological parameters, the history and structure of ... -
SDSS-IV MaNGA : environmental dependence of stellar age and metallicity gradients in nearby galaxies
(2017) [Artículo de periódico]We present a study on the stellar age and metallicity distributions for 1105 galaxies using the STARLIGHT software on MaNGA (Mapping Nearby Galaxies at APO) integral field spectra.We derive age and metallicity gradients ... -
SDSS-IV MaNGA : excavating the fossil record of stellar populations in spiral galaxies
(2020) [Artículo de periódico]We perform a ‘fossil record’ analysis for ≈800 low-redshift spiral galaxies, using STARLIGHT applied to integral field spectroscopic observations from the SDSS-IV MaNGA survey to obtain fully spatially resolved high-resolution ... -
SDSS-IV MaNGA : exploring the local scaling relations for N/O
(2022) [Artículo de periódico]We present, for the first time, the relationship between local stellar mass surface density, Σ*, and N/O derived from SDSS-IV MaNGA data, using a sample of 792,765 high signal-to-noise ratio star-forming spaxels. Using a ... -
SDSS-IV MaNGA : inside-out versus outside-in quenching of galaxies in different local environments
(2019) [Artículo de periódico]The large Integral Field Spectroscopy surveys have allowed the classification of ionizing sources of emission lines on sub-kiloparsec scales. In this work, we define two non-parametric parameters, quiescence (Fq) and its ... -
SDSS IV MaNGA : metallicity and ionisation parameter in local star-forming galaxies from Bayesian fitting to photoionisation models
(2020) [Artículo de periódico]We measured gas-phase metallicity, ionisation parameter, and dust extinction for a representative sample of 1795 local star-forming galaxies using integral field spectroscopy from the SDSS-IV MaNGA survey. We self-consistently ... -
SDSS-IV MaNGA : properties of galaxies with kinematically decoupled stellar and gaseous components
(2016) [Artículo de periódico]We study the properties of 66 galaxies with kinematically misaligned gas and stars from MaNGA survey. The fraction of kinematically misaligned galaxies varies with galaxy physical parameters, i.e. M∗, SFR and sSFR. According ... -
SDSS-IV MaNGA : spatial evolution of star formation triggered by galaxy interactions
(2019) [Artículo de periódico]Galaxy interaction is considered a key driver of galaxy evolution and star formation (SF) history. In this paper, we present an empirical picture of the radial extent of interaction-triggered SF along the merger sequence. ...