29,697 research outputs found

    Diagnóstico e prioridades de pesquisa em agricultura irrigada: região Sul.

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    Estado da arte da agricultura irrigada na região Sul; Prioridades da pesquisa em agricultura irrigada na região Sul; Produção agrícola e respectivas áreas colhidas na região Sul.bitstream/item/43721/1/Diagnostico-e-prioridades-regiao-sul.pd

    Diagnóstico e prioridades de pesquisa em agricultura irrigada: Região Norte.

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    Região da arte da agricultura irrigada na região norte; Prioridades de pesquisa em agricultura irrigada para a região norte.bitstream/item/43728/1/Diagnostico-e-prioridades-regiao-norte.pd

    Estudo da estabilidade da linamarase de manihot esculenta crantz sob armazenamento.

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    A linamarase é uma β-glicosidase que pode ser obtida, dentre outras fontes, da mandioca. Ela é responsável pela hidrólise dos glicosídeos cianogênicos linamarina e lotaustralina, que se supõe estão envolvidos em processos de defesa da planta

    PCA Tomography and its application to nearby galactic nuclei

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    With the development of modern technologies such as IFUs, it is possible to obtain data cubes in which one produces images with spectral resolution. To extract information from them can be quite complex, and hence the development of new methods of data analysis is desirable. We briefly describe a method of analysis of data cubes (data from single field observations, containing two spatial and one spectral dimension) that uses Principal Component Analysis (PCA) to express the data in the form of reduced dimensionality, facilitating efficient information extraction from very large data sets. We applied the method, for illustration purpose, to the central region of the low ionization nuclear emission region (LINER) galaxy NGC 4736, and demonstrate that it has a type 1 active nucleus, not known before. Furthermore, we show that it is displaced from the centre of its stellar bulge.Comment: 4 pages, 1 figure, 1 table, to be published in the Proceedings of the IAU Symposium no. 26

    Diffusion Enhancement in Core-softened fluid confined in nanotubes

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    We study the effect of confinement in the dynamical behavior of a core-softened fluid. The fluid is modeled as a two length scales potential. This potential in the bulk reproduces the anomalous behavior observed in the density and in the diffusion of liquid water. A series of NpTNpT Molecular Dynamics simulations for this two length scales fluid confined in a nanotube were performed. We obtain that the diffusion coefficient increases with the increase of the nanotube radius for wide channels as expected for normal fluids. However, for narrow channels, the confinement shows an enhancement in the diffusion coefficient when the nanotube radius decreases. This behavior, observed for water, is explained in the framework of the two length scales potential.Comment: 17 pages, 8 figures, accept for publication at J. Chem. Phy

    Strong disorder renormalization group study of aperiodic quantum Ising chains

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    We employ an adaptation of a strong-disorder renormalization-group technique in order to analyze the ferro-paramagnetic quantum phase transition of Ising chains with aperiodic but deterministic couplings under the action of a transverse field. In the presence of marginal or relevant geometric fluctuations induced by aperiodicity, for which the critical behavior is expected to depart from the Onsager universality class, we derive analytical and asymptotically exact expressions for various critical exponents (including the correlation-length and the magnetization exponents, which are not easily obtainable by other methods), and shed light onto the nature of the ground state structures in the neighborhood of the critical point. The main results obtained by this approach are confirmed by finite-size scaling analyses of numerical calculations based on the free-fermion method
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