Perfil tecnico-economico dos perimetros irrigados das bacias do Curu e Baixo Acarau

bitstream/CNPAT/7902/1/doc80.pd

Evidence for Lattice Effects at the Charge-Ordering Transition in (TMTTF)2_2X

High-resolution thermal expansion measurements have been performed for exploring the mysterious "structureless transition" in (TMTTF)$_{2}$X (X = PF$_{6}$ and AsF$_{6}$), where charge ordering at $T_{CO}$ coincides with the onset of ferroelectric order. Particularly distinct lattice effects are found at $T_{CO}$ in the uniaxial expansivity along the interstack $\textbf{\textit{c*}}$-direction. We propose a scheme involving a charge modulation along the TMTTF stacks and its coupling to displacements of the counteranions X$^{-}$. These anion shifts, which lift the inversion symmetry enabling ferroelectric order to develop, determine the 3D charge pattern without ambiguity. Evidence is found for another anomaly for both materials at $T_{int}$ $\simeq$ 0.6 $\cdot$ $T_{CO}$ indicative of a phase transition related to the charge ordering

Estabilidade durante armazenamento de hambúrguer vegetal elaborado à base de caju.

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Processo agroindustrial: obtenção de um produto de manga por desidratação osmótica e complementação de secagem em estufa.

bitstream/CNPAT-2010/11960/1/ct-99.pd

Ceinfo cliente: manual do usuario

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Epidemiologia do mofo-preto e danos na produção do cajueiro.

Material e métodos. Resultados e discussão. Conclusões.bitstream/CNPAT-2010/10341/1/Bd-023.pd

Centro de Informações Tecnológicas e Comerciais para a fruticultura tropical.

bitstream/CNPAT/7914/1/doc57.pd

Reentrant valence transition in EuO at high pressures: beyond the bond-valence model

The pressure-dependent relation between Eu valence and lattice structure in model compound EuO is studied with synchrotron-based x-ray spectroscopic and diffraction techniques. Contrary to expectation, a 7% volume collapse at $\approx$ 45 GPa is accompanied by a reentrant Eu valence transition into a \emph{lower} valence state. In addition to highlighting the need for probing both structure and electronic states directly when valence information is sought in mixed-valent systems, the results also show that widely used bond-valence methods fail to quantitatively describe the complex electronic valence behavior of EuO under pressure.Comment: 5 pages, 4 figure