680 research outputs found
Assessment measures for specific language impairment in Brazil: A systematic review
Specific Language Impairment (SLI) is defined as an unexpected failure in linguistic abilities during a child\u27s early years of development. Children with SLI do not present significant impairment in nonverbal intellectual outcomes and do not lack normal environmental exposure to language. Brazilian and worldwide researchers have sought to understand the cultural implications of SLI in the Brazilian Portuguese language. Standardized and validated measures must be used in empirical studies. The present study systematically reviewed the instruments used to assess linguistic abilities in quantitative SLI research in Brazil. Three databases were chosen: Medline, SciELO, and Google Scholar. From a total of 828 articles retrieved, only 10 met the inclusion criteria. Seven standardized assessment measures were identified. However, only two of these reported psychometric properties using adequate normative data. No normalized instrument measured the entire spectrum of linguistic abilities. We discuss the results from the perspective of SLI theories and evidence in Brazil and worldwide
Estimativa da Variabilidade Genética da Piraíba ( Brachyplatystoma Filamentosum) na Amazônia Brasileira.
On Aharonov-Casher bound states
In this work bound states for the Aharonov-Casher problem are considered.
According to Hagen's work on the exact equivalence between spin-1/2
Aharonov-Bohm and Aharonov-Casher effects, is known that the
term cannot be neglected in the
Hamiltonian if the spin of particle is considered. This term leads to the
existence of a singular potential at the origin. By modeling the problem by
boundary conditions at the origin which arises by the self-adjoint extension of
the Hamiltonian, we derive for the first time an expression for the bound state
energy of the Aharonov-Casher problem. As an application, we consider the
Aharonov-Casher plus a two-dimensional harmonic oscillator. We derive the
expression for the harmonic oscillator energies and compare it with the
expression obtained in the case without singularity. At the end, an approach
for determination of the self-adjoint extension parameter is given. In our
approach, the parameter is obtained essentially in terms of physics of the
problem.Comment: 11 pages, matches published versio
A comercialização do fruto de bacuri pela agricultura familiar no Nordeste paraense e ilha de Marajó, no Pará.
Respiração, liberação de etileno e qualidade de graviola (Annona muricata L.) durante a maturação pós-colheita.
O objetivo deste estudo foi avaliar alterações físicas-químicas durante a maturação da graviola
Effects of clays on spin-spin relaxation: a route for non-invasive total clay content quantification
Clay minerals are important components of sandstone rocks, due to their
significant role on petrophysical properties like porosity and permeability.
These minerals have a particular impact on Nuclear Magnetic Resonance
measurements since the iron contained on clays generates internal gradients
which directly affect the transverse relaxation. Here, we apply a methodology
recently developed to a set of 20 sandstones, with varying clay content and
mineralogy, in order to estimate the total clay content by using the effect of
internal gradients on transverse relaxation. Based on these measurements, we
propose a geochemical rock typing from quantities determined by our
measurements, namely the total clay content and porosity
Compostos fenólicos e enzimas oxidativos da graviola (Annona muricata) durante a maturação.
O presente trabalho teve por objetivo avaliar as variações nos teores de compostos fenólicos e na atividade de enzimas oxidativas durante a maturação da graviola
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