Browsing Exact and Earth Sciences by Title
Now showing items 2236-2255 of 5964
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Gossan mineralogy, textures, and gold enrichment over the Au (As, Bi, Ag) deposit in the Buracão Area (Brasília Fold Belt, Brazil): implications for gold prospecting in weathering profiles
(2020) [Journal article]The orogenic pyrite–rich Au (As, Bi, Ag) mineralization (up to 31 g/t) of the Buracão area is one of several orogenic deposits in the Brasilia Fold Belt (BFB; Central Brazil), exposed to tropical weathering that shows ... -
GRACES observations of young [α/Fe]-rich stars
(2016) [Journal article]We measure chemical abundance ratios and radial velocities in four massive (i.e. young) [α/Fe]-rich red giant stars using high-resolution high-S/N spectra from ESPaDOnS fed by Gemini-GRACES. Our differential analysis ensures ... -
Gráficos de controle multivariados para monitoramento de processos não lineares em bateladas
(2011) [Journal article]Processos industriais em bateladas são empregados com frequência na produção de certos itens. Tais processos disponibilizam uma estrutura de dados peculiar; diante disso, existe um crescente interesse no desenvolvimento ... -
Gráficos na escola
(1992) [Journal article] -
Grain growth from homogeneous initial conditions : anomalous grain growth and special scaling states
(1995) [Journal article]We used the large-Q Potts model on a two-dimensional lattice to study the evolution of the disordered cluster developed from a perfect hexagonal lattice with a single defect. The distribution functions were not stable, ... -
Granger causality and time series regression for modelling the migratory dynamics of infuenza into Brazil
(2023) [Journal article]In this work we study the problem of modelling and forecasting the dynamics of the infuenza virus in Brazil at a given month, from data on reported cases and genetic diversity collected from previous months, in other ... -
Granular superconductivity ina Ca-doped YBa/sub 2/Cu/sub 3/O/sub 7-σ single crystal : role of divalent impurities and the effect of applied field on the grain coupling
(2007) [Journal article]We investigate the effect of the divalent Ca atoms at the trivalent Y site of YBa2Cu3O7−δ on the magnetoconductivity and magnetic irreversibility of single crystals and a polycrystalline sample. The magnetic irreversibility ... -
Graphical models and point pattern matching
(2006) [Journal article]This paper describes a novel solution to the rigid point pattern matching problem in Euclidean spaces of any dimension. Although we assume rigid motion, jitter is allowed. We present a noniterative, polynomial time algorithm ... -
A graphite thermal evaporation source for aluminum
(1990) [Journal article] -
Green-Function Method for a Mixed-Valence Hamiltonian
(1984) [Journal article]A Green-function diagrammatic method is utilized to calculate the occupation number of a narrow (j) band in a mixed-valence system. The method is a generalization of the Hubbard-1 approximation for a two-band Hamiltonian. ... -
Green method by diffuse reflectance infrared spectroscopy and spectral region selection for the quantification of sulphamethoxazole and trimethoprim in pharmaceutical formulations
(2016) [Journal article]An alternative method for the quantifi cation of sulphametoxazole (SMZ) and trimethoprim (TMP) using diffuse refl ectance infrared Fourier-transform spectroscopy (DRIFTS) and partial least square regression (PLS) was ... -
Ground- and excited-state scattering potentials for the stopping of protons in an electron gas
(2019) [Journal article]The self-consistent electron–ion potential V(r) is calculated for H+ ions in an electron gas system as a function of the projectile energy to model the electronic stopping power for conduction-band electrons. The results ... -
Ground-based observation of ZZ Ceti stars and the discovery of four new variables
(2019) [Journal article]We perform ground-based photometric observations of 22 DA white dwarf stars, 10 already known ZZ Cetis and 12 candidates with atmospheric parameters inside the classical instability strip. We report on the discovery of ... -
Ground states of spin-1 bosons in asymmetric double wells
(2015) [Journal article]In this work we investigate the different states of a system of spin-1 bosons in two potential wells connected by tunneling, with spin-dependent interaction. The model utilizes the well-known Bose-Hubbard Hamiltonian, ... -
Group velocity of obliquely propagating Alfvén waves in a magnetized dusty plasma
(2022) [Journal article]In this work, we investigate the characteristics of the group velocity of obliquely propagating Alfvén in a dusty plasma typical of a stellar wind. The dispersion relation is derived with the aid of the kinetic theory for ... -
Growth and form of two-dimensional rotating aggregates
(1993) [Journal article]We propose a two-dimensional particle-cluster aggregation model which considers explicitly linear and angular momentum conservation. Each aggregate is grown from a seed of given mass and given initial angular velocity, to ... -
Growth kinetics of solid-state-reacted fe-zr multilayer films
(1991) [Journal article]Multilayers of Fee0.33Zr0.67, prepared by electron beam evaporation, have been characterized by conversion electron Mijssbauer spectroscopy, Rutherford backscattering spectroscopy, and x-ray diffraction. Two phases, one ... -
Growth laws and self-similar growth regimes of coarsening two-dimensional foams : transition from dry to wet limits
(2012) [Journal article]We study the topology and geometry of two-dimensional coarsening foam with an arbitrary liquid fraction. To interpolate between the dry limit described by von Neumann’s law and the wet limit described by Marqusee’s equation, ... -
Growth of boron-doped few-layer graphene by molecular beam epitaxy
(2018) [Journal article]We investigated the growth of boron-doped few-layer graphene on a-Al2O3 (0001) substrates by molecular beam epitaxy using two different growth approaches: one where boron was provided during the entire graphene synthesis ... -
Growth of Paecilomyces variotii in B0 (diesel), B100 (biodiesel) and B7 (blend), degradation and molecular detection
(2015) [Journal article]A introdução de biodiesel ao diesel pode permitir que o combustível se torne mais suscetível ao crescimento de microorganismos, especialmente durante o armazenamento incorreto. Para analisar o efeito da adição de biodiesel ...