8,335 research outputs found
Produção integrada: divulgando o sistema ao consumidor.
O presente artigo fornece um panorama da fruticultura brasileira e discute como o sistema de Produção Integrada pode fazer a diferença nesse cenário. O objetivo final é divulgar esse sistema e seus benefícios para a sociedade. Para tal, com base numa revisão bibliográfica e em análises de casos similares, algumas ações de marketing foram indicadas Dessa forma espera-se que o consumidor entenda que tem uma nova opção para o consumo seguro não só de frutas, como de toda a cadeia agropecuária
Double percolation effects and fractal behavior in magnetic/superconducting hybrids
Perpendicular magnetic anisotropy ferromagnetic/ superconducting (FM/SC)
bilayers with a labyrinth domain structure are used to study nucleation of
superconductivity on a fractal network, tunable through magnetic history. As
clusters of reversed domains appear in the FM layer, the SC film shows a
percolative behavior that depends on two independent processes: the arrangement
of initial reversed domains and the fractal geometry of expanding clusters. For
a full labyrinth structure, the behavior of the upper critical field is typical
of confined superconductivity on a fractal network.Comment: 15 pages, 5 figure
Variação temporal e espacial de parâmetros de qualidade de água no reservatório de Barra Bonita/SP, como subsídio ao manejo da bacia de contribuição.
bitstream/item/135805/1/BPD-228-Qualidade-Agua.pd
Superscars in the LiNC=LiCN isomerization reaction
We demonstrate the existence of superscarring in the LiNC=LiCN isomerization
reaction described by a realistic potential interaction in the range of readily
attainable experimental energies. This phenomenon arises as the effect of two
periodic orbits appearing "out of the blue"in a saddle--node bifurcation taking
place in the dynamics of the system. Potential practical consequences of this
superlocalization in the corresponding wave functions are also considered.Comment: 6 pages, 5 figures. to appear in EP
Ochratoxigenic aspergillus in wine grapes and ochratoxin a in wines from Northeast Brazil.
Resumo
The Network of Epicenters of the Olami-Feder-Christensen Model of Earthquakes
We study the dynamics of the Olami-Feder-Christensen (OFC) model of
earthquakes, focusing on the behavior of sequences of epicenters regarded as a
growing complex network. Besides making a detailed and quantitative study of
the effects of the borders (the occurrence of epicenters is dominated by a
strong border effect which does not scale with system size), we examine the
degree distribution and the degree correlation of the graph. We detect sharp
differences between the conservative and nonconservative regimes of the model.
Removing border effects, the conservative regime exhibits a Poisson-like degree
statistics and is uncorrelated, while the nonconservative has a broad
power-law-like distribution of degrees (if the smallest events are ignored),
which reproduces the observed behavior of real earthquakes. In this regime the
graph has also a unusually strong degree correlation among the vertices with
higher degree, which is the result of the existence of temporary attractors for
the dynamics: as the system evolves, the epicenters concentrate increasingly on
fewer sites, exhibiting strong synchronization, but eventually spread again
over the lattice after a series of sufficiently large earthquakes. We propose
an analytical description of the dynamics of this growing network, considering
a Markov process network with hidden variables, which is able to account for
the mentioned properties.Comment: 9 pages, 10 figures. Smaller number of figures, and minor text
corrections and modifications. For version with full resolution images see
http://fig.if.usp.br/~tpeixoto/cond-mat-0602244.pd
Projeto-piloto de promoção comercial de frutas da produção integrada: fundamentos e resultados.
bitstream/item/59966/1/CNPUV-CIR.TEC.-80-08.pd
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