Influência do tamanho da cova e adubação mineral no crescimento, desenvolvimento e produção do cajueiro anão precoce.

As dimensoes da cova, o tempo gasto na abertura e a convivencia ou nao de colocar adubos no seu interior constituem os principais fatores de recuperacao no custo de implantacao da fruticultura. O custo da mao de obra, as dificuldades na obtencao dos adubos organicos e o alto custo da adubacao mineral podem limitar a implantacao de um pomar com frutiferas arboreas, a exemplo do cajueiro.bitstream/CNPAT-2010/2741/1/Pa-018.pd

Vacuum Polarization by a Magnetic Flux Tube at Finite Temperature in the Cosmic String Spacetime

In this paper we analyse the effect produced by the temperature in the vacuum polarization associated with charged massless scalar field in the presence of magnetic flux tube in the cosmic string spacetime. Three different configurations of magnetic fields are taken into account: $(i)$ a homogeneous field inside the tube, $(ii)$ a field proportional to $1/r$ and $(iii)$ a cylindrical shell with $\delta$-function. In these three cases, the axis of the infinitely long tube of radius $R$ coincides with the cosmic string. Because the complexity of this analysis in the region inside the tube, we consider the thermal effect in the region outside. In order to develop this analysis, we construct the thermal Green function associated with this system for the three above mentioned situations considering points in the region outside the tube. We explicitly calculate in the high-temperature limit, the thermal average of the field square and the energy-momentum tensor.Comment: 16 pages, 1 figur

Black hole formation in bidimensional dilaton gravity coupled to scalar matter systems

This work deals with the formation of black hole in bidimensional dilaton gravity coupled to scalar matter fields. We investigate two scalar matter systems, one described by a sixth power potential and the other defined with two scalar fields containing up to the fourth power in the fields. The topological solutions that appear in these cases allow the formation of black holes in the corresponding dilaton gravity models.Comment: Latex, 9 pages. Published in Mod. Phys. Lett. A14 (1999) 268

Relativistic Quantum Scattering on a Cone

We study the relativistic quantum mechanical scattering of a bosonic particle by an infinite straight cosmic string, considering the non-minimal coupling between the bosonic field and the scalar curvature. In this case, an effective two-dimensional delta-function interaction takes place besides the usual topological scattering and a renormalization procedure is necessary in order to treat the problem that appears in connection with the delta-function.Comment: 22 pages, LATEX fil

Sistemas de manejo de solo litorâneo cultivado com cajueiro anão precoce.

O cultivo do cajueiro (Anacardium occidentale L.) e bastante expressivo nos solos dos tabuleiros costeiros da regiao Nordeste Ocidental, em face da sua rusticidade e adaptabilidade as condicoes edafoclimaticas locais. A regiao litoranea do Ceara e constituida, igualmente, de solos arenosos com problemas de deficiencia hidrica e baixa fertilidade natural, exigindo o conhecimento detalhado de suas caracteristicas para o desenvolvimento das tecnicas de manejo mais apropriadas. Nestas areas, verifica-se uma exploracao continua para atender a demanda de alimentos e de materia-prima para a agroindustria do caju, intensificada pelo uso crescente de mecanizacao em substituicao ao trabalho humano.bitstream/CNPAT-2010/2157/1/Pa-009.pd

Microbiological quality of Brazil nuts milk submitted to different dehulling methods.

Bertholletia excelsa Bonpl populaly known as Brazil nut, is considered one of the noblest species of the Amazon rainforest, being found throughout this territory. Its fruit represents a high economic value due to its use in both human and animal feeding, presenting about 60 to 70% of lipids, polyunsaturated fatty acids and 15 to 20% of protein. There are many uses of Brazil nuts, and the "milk" extracted from the nuts, is usually consumed pure and used by the natives as typical food. Due to the high content of unsaturated fatty acids in its composition, the nuts becomes very perishable, due oxidative processes, reduction of nutritional value, appearance of smell and rancid flavor, leading to a product with low quality, besides the susceptibility to colonization by pathogenic microorganisms due poorly handled. The process for obtaining Brazil nuts milk involves the stages of degumming of the nuts, extraction, separation of the insoluble residue, formulation and packaging. The most common form of degumming is manual. The objective of the work was to evaluate the microbiological quality of Brazil nuts and its milk obtained through the processes of manual or NaOH dehulling. The count of aerobic bacteria in the standard agar for counting (PCA), total coliforms and E. coli, presence of Salmonella sp., and counting of molds and yeasts using Potato Dextrose Agar (PDA) were counted