Controle da murcha da teia micelica na Transamazônica.

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Melhoramento do caupi, Vigna unguiculata (L.) Walp., na Transamazônica, PA.

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Regeneração e multiplicação de germoplasma de milho (Zea mays L.) na Região Amazônica.

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Caracterização dos solos do município de Belterra, Estado do Pará.

bitstream/item/63490/1/Oriental-Doc88.pdfAnexo mapa: Mapa de solos do Município de Belterra - Pará

Competição de cultivares de arroz para cultivo em terra firme na região da Transamazônica.

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Maravilha: cultivar de arroz de sequeiro recomendada para a região oeste do Estado do Pará.

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Ensaio comparativo avançado de arroz de sequeiro em Alenquer, Pará - ano agrícola 1998/1999.

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Lattice specific heat for the RMIn5_5 (R = Gd, La, Y, M = Co, Rh) compounds: non-magnetic contribution subtraction

We analyze theoretically a common experimental process used to obtain the magnetic contribution to the specific heat of a given magnetic material. In the procedure, the specific heat of a non-magnetic analog is measured and used to subtract the non-magnetic contributions, which are generally dominated by the lattice degrees of freedom in a wide range of temperatures. We calculate the lattice contribution to the specific heat for the magnetic compounds GdMIn$_5$ (M = Co, Rh) and for the non-magnetic YMIn$_5$ and LaMIn$_5$ (M = Co, Rh), using density functional theory based methods. We find that the best non-magnetic analog for the subtraction depends on the magnetic material and on the range of temperatures. While the phonon specific heat contribution of YRhIn$_5$ is an excellent approximation to the one of GdCoIn$_5$ in the full temperature range, for GdRhIn$_5$ we find a better agreement with LaCoIn$_5$, in both cases, as a result of an optimum compensation effect between masses and volumes. We present measurements of the specific heat of the compounds GdMIn$_5$ (M = Co, Rh) up to room temperature where it surpasses the value expected from the Dulong-Petit law. We obtain a good agreement between theory and experiment when we include anharmonic effects in the calculations