7,375 research outputs found
A viabilidade da pequena propriedade, a viabilidade do pequeno produtor.
bitstream/item/119172/1/digitalizar0013.pd
Vacuum fluctuations of a scalar field near a reflecting boundary and their effects on the motion of a test particle
The contribution from quantum vacuum fluctuations of a real massless scalar
field to the motion of a test particle that interacts with the field in the
presence of a perfectly reflecting flat boundary is here investigated. There is
no quantum induced dispersions on the motion of the particle when it is alone
in the empty space. However, when a reflecting wall is introduced, dispersions
occur with magnitude dependent on how fast the system evolves between the two
scenarios. A possible way of implementing this process would be by means of an
idealized sudden switching, for which the transition occurs instantaneously.
Although the sudden process is a simple and mathematically convenient
idealization it brings some divergences to the results, particularly at a time
corresponding to a round trip of a light signal between the particle and the
wall. It is shown that the use of smooth switching functions, besides
regularizing such divergences, enables us to better understand the behavior of
the quantum dispersions induced on the motion of the particle. Furthermore, the
action of modifying the vacuum state of the system leads to a change in the
particle energy that depends on how fast the transition between these states is
implemented. Possible implications of these results to the similar case of an
electric charge near a perfectly conducting wall are discussed.Comment: 17 pages, 8 figure
Intermingled basins in coupled Lorenz systems
We consider a system of two identical linearly coupled Lorenz oscillators,
presenting synchro- nization of chaotic motion for a specified range of the
coupling strength. We verify the existence of global synchronization and
antisynchronization attractors with intermingled basins of attraction, such
that the basin of one attractor is riddled with holes belonging to the basin of
the other attractor and vice versa. We investigated this phenomenon by
verifying the fulfillment of the mathematical requirements for intermingled
basins, and also obtained scaling laws that characterize quantitatively the
riddling of both basins for this system
Sistemas de producción de semillas para pequeños agricultores: una visión no convencional
Recomendações para o manejo da planta e dos cachos das cultivares de uvas de mesa sem sementes BRS Morena, BRS Clara e BRS Linda.
bitstream/CNPUV/8129/1/cir051.pd
Capacitação de técnicos extensionistas e produtores na produção intensiva de leite ? transferência de tecnologia (projeto balde cheio).
Alternativas inovadoras para otimizar a transferência de tecnologia para a agricultura familiar.
Editado por Flávio Augusto Portela Santos, José Carlos de Moura, Vidal Pedroso de Faria
Wine grape cultivars adaptation and selection for tropical regions.
Wine production is a recent economical activity on tropical regions. In Brazil, tropical wines production started on Sub-Middle São Francisco River Valley Region in the early 1980 years. In the following years, other tropical countries such as Venezuela, Thailand and India have invested in the wine industry. All wine grape cultivars used in the tropical zones are introduced from the traditional temperate winegrowing regions. There are a small number of wine grape cultivars whose cultivation is consolidated in tropical environments, such as ?Syrah? and ?Chenin Blanc?, which possess good adaptation and present a great potential of wine quality. Wine grape cultivars evaluation and selection is one of the important priorities in order to diversify the quality wine production in the tropics. The environmental diversity of tropical zones in comparison with the original regions of wine grape cultivars, all of them from temperate climates, requires detailed evaluation and specific cultural practice adjustments to obtain convenient production from each cultivar and for each tropical environment. Climatic factors as winter absence, temperature changes and rain variations throughout the year change the physiological behavior of vines, offering different grapes and wine qualities at different seasons. In this paper are discussed questions inherent to the screening criteria and evaluation methodology to select wine grape cultivars to produce quality wines in tropical regions. Results obtained at the Sub-Middle São Francisco River Valley are presented.Trabalho apresentado no II International Symposium on Tropical Wines, de 25 a 28 de maio de 2010, Petrolina. Editado por Giuliano Elias Pereira e Jorge Tonietto
Avaliação dos impactos econômicos, sociais e ambientais de tecnologias da Embrapa Pecuária Sudeste. 4. Técnicas de produção intensiva aplicadas a propriedades familiares produtoras de leite.
bitstream/CPPSE/16766/1/documentos-57.pd
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