EMBRAPA cria Programa Nacional de Pesquisa de Babacu.

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Logistics and supply chain management: an area with a strategic service perspective

Logistics and supply chain management is an area that evolved deeply in the past years, integrating develop-ments of other areas of knowledge, both entrepreneurial and general. In this paper, a perspective of the evolu-tion of logistics and supply chain management is somehow designed. Traditionally, one may find logistics and supply chain management in friction with marketing and claiming for its own space. Nowadays, it seems difficult to see internal (logistics) versus external (marketing) wars and different orientations between marketing and logistics because they are both service and relations oriented. Simple transactions have been substituted, long time ago, for sustainable relations in the area of logistics and supply chain management. Finally, a more service oriented logic has been the footprint of logistics and supply chain management in current days and not, as pre-tended for some current rows of investigation, a simple transaction approach under a goods dominant logic. Lo-gistics and supply chain management is nowadays in parallel with an S-D logic (service dominant logic) because it is an area where relations matter, where sustainable links between networks of companies are crucial and where service is key in order to accommodate the contemporary thoughts and practices in the area. The main purpose of the paper is to stress the point that logistics and supply chain management is an area of service and value creation (or co-creation) and not a simple area of goods exchange and simple transactions

On central tendency and dispersion measures for intervals and hypercubes

The uncertainty or the variability of the data may be treated by considering, rather than a single value for each data, the interval of values in which it may fall. This paper studies the derivation of basic description statistics for interval-valued datasets. We propose a geometrical approach in the determination of summary statistics (central tendency and dispersion measures) for interval-valued variables

Improved semiclassical density matrix: taming caustics

We present a simple method to deal with caustics in the semiclassical approximation to the thermal density matrix of a particle moving on the line. For simplicity, only its diagonal elements are considered. The only ingredient we require is the knowledge of the extrema of the Euclidean action. The procedure makes use of complex trajectories, and is applied to the quartic double-well potential.Comment: 20 pages, 7 figures. Revised version, accepted for publication in Phys. Rev.

Propagação do cupuaçuzeiro.

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Magnetic phases evolution in the LaMn1-xFexO3+y system

We have investigated the crystal structure and magnetic properties for polycrystalline samples of LaMn1-xFexO3+y, in the whole range x=0.0 to x=1.0, prepared by solid state reaction in air. All samples show the ORT-2 orthorhombic structure that suppresses the Jahn-Teller distortion, thus favoring a ferromagnetic (FM) superexchange (SE) interaction between Mn^{3+}-O-Mn^{3+}. For x=0.0 the oxygen excess (y ~ 0.09) produces vacancies in the La and Mn sites and generates a fraction around 18% of Mn^{4+} ions and 82% of the usual Mn^{3+} ions, with possible double exchange interaction between them. The Fe doping in this system is known to produce only stable Fe^{3+} ions. We find an evolution from a fairly strong FM phase with a Curie temperature T_{C} ~ 160 K, for x=0.0, to an antiferromagnetic (AFM) phase with T_{N} = 790 K, for x=1.0, accompanied by clear signatures of a cluster-glass behavior. For intermediate Fe contents a mixed-phase state occurs, with a gradual decrease (increase) of the FM (AFM) phase, accompanied by a systematic transition broadening for 0.2 < x < 0.7. A model based on the expected exchange interaction among the various magnetic-ion types, accounts very well for the saturation-magnetization dependence on Fe doping.Comment: 27 pages, 9 figure

Níveis de tolerância e letal de umidade em sementes de pupunheira, Bactris gasipaes.

Sementes de pupunheira (Bactris gasipaes Kunth) foram submetidas a dessecamento, em ambiente com ar condicionado (23 mais ou menos 1oC e umidade relativa do ar de 72 mais ou menos 5%), com o objetivo de determinar os níveis de tolerância e letal de umidade, assim como verificar as implica coes do dessecamento sobre o tempo médio e a uniformidade de germinação. A exposição das sementes, nesse ambiente, durante 0 (testemunha), 24, 48, 72, 96, 120 e 168 horas, possibilitou a obtenção dos seguintes graus de umidade: 48,0%; 36,8%; 30,9%; 22,7%; 20,2%; 15,8% e 12,6%, respectivamente. Imediatamente após cada período de secagem, as sementes foram semeadas em substrato de areia e serragem, misturadas na proporção volumétrica de 1:1. Os testes de germinação foram conduzidos nas condições de temperatura ambiente (26, 6oC, em media), com quatro repetições de 50 sementes e tiveram a duração de 120 dias