Quantum Kalb-Ramond Field in D-dimensional de Sitter Spacetimes

In this work we investigate the quantum theory of the Kalb-Ramond fields propagating in $D-$dimensional de Sitter spacetimes using the dynamic invariant method developed by Lewis and Riesenfeld [J. Math. Phys. 10, 1458 (1969)] to obtain the solution of the time-dependent Schr\"odinger equation. The wave function is written in terms of a $c-$number quantity satisfying of the Milne-Pinney equation, whose solution can be expressed in terms of two independent solutions of the respective equation of motion. We obtain the exact solution for the quantum Kalb-Ramond field in the de Sitter background and discuss its relation with the Cremmer-Scherk-Kalb-Ramond model

Advances in imaging THGEM-based detectors

The thick GEM (THGEM) [1] is an "expanded" GEM, economically produced in the PCB industry by simple drilling and etching in G-10 or other insulating materials (fig. 1). Similar to GEM, its operation is based on electron gas avalanche multiplication in sub-mm holes, resulting in very high gain and fast signals. Due to its large hole size, the THGEM is particularly efficient in transporting the electrons into and from the holes, leading to efficient single-electron detection and effective cascaded operation. The THGEM provides true pixilated radiation localization, ns signals, high gain and high rate capability. For a comprehensive summary of the THGEM properties, the reader is referred to [2, 3]. In this article we present a summary of our recent study on THGEM-based imaging, carried out with a 10x10 cm^2 double-THGEM detector.Comment: 3 pages, 3 figures. Presented at the 10th Pisa Meeting on Advanced Detectors; ELBA-Italy; May 21-27 200

NUMERICAL SIMULATION OF THE FLOW AROUND A SQUARE CYLINDER USING THE VORTEX METHOD

The study of external incompressible flows around bluff bodies finds extensive applicability to real-life problems. Such flows are characterized by unsteady flow separation for high values of the Reynolds number, where a Von Karman-type periodic wake is formed. The prediction of these flows is very difficult, and one has usually to rely on specific experimental data to calculate the aerodynamic forces on the body. In order to numerically simulate this flow, this paper uses a new mesh-free two-dimensional Discrete Vortex Method associated with a Panel Method to calculate the lift and drag coefficients, as well as the pressure coefficient on a square cylinder, for a high Reynolds number flow. Lamb vortices are generated along the cylinder surface, whose strengths are determined to ensure that the no-slip condition is satisfied and that circulation is conserved. The impermeability condition is imposed through a source panel method, so that mass conservation is explicitly enforced. The dynamics of the body wake is computed using the convection-diffusion splitting algorithm, where the diffusion process is simulated using the random walk method, and the convection process is carried out with a lagrangian second-order time-marching scheme. Results for the aerodynamic forces and pressure distribution are presented

Diagnóstico das condições de processamento e caracterização físico-química de queijos regionais e manteiga no Rio Grande do Norte.

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Variabilidade espacial do rendimento de culturas e dos atributos físicos de um latossolo vermelho sob semeadura direta.

O conhecimento da variabilidade espacial dos atributos físicos do solo relacionados com o seu estado de compactação favorece o manejo específico dos fatores de produção. Desta maneira, o objetivo deste trabalho foi avaliar a variabilidade espacial de atributos físicos do solo e da produtividade de distintas culturas em um Latossolo Vermelho sob semeadura direta em Campinas (SP). A área em estudo está localizada no Centro Experimental Central do Instituto Agronômico. A área de 3,42 ha vem sendo manejada desde 1985 com semeadura direta em rotação de culturas. Os atributos físicos do solo estudados foram: textura (g kg -1), densidade (kg dm3), porosidade total (m3 m-3) e resistência do solo à penetração (MPa). As culturas envolvidas neste estudo foram: labelabe (2002), milho (2003), triticale (2004) e mamona (2005). Os resultados indicam que a área de estudo não apresenta problemas de compactação. A parte lateral esquerda da área apresentou os maiores valores de produtividade e os menores valores de densidade e os maiores valores de porosidade total

Herpetofauna, Espora Hydroelectric Power Plant, state of Goiás, Brazil.

We provide a checklist of the herpetofaunal assemblage from Espora Hydroelectric Power Plant region(UHE Espora), southwestern of the state of Goiás, Brazil. Representatives of 32 amphibian and 71 reptile species wereobtained during faunal monitoring and faunal rescue programs carried out in the study area. The obtained species listand distribution records are here discussed in an attempt to improve the still limited knowledge on Cerradoherpetofaunal assemblages

Estudos CTS e construções em agroecologia: expansão de comunidade epistêmica ou processos transepistêmicos?

Apresenta e discute a obra Ciência, tecnologia e sociedade (CTS) para a construção da Agroecologia, publicada pela Editora da UnB em 2014, uma coletânea de 14 capítulos sequenciais que se destinam a um público abrangente, das ciências sociais aplicadas aos campos dos estudos sociais da ciência e da tecnologia e, sobretudo, a formuladores, operadores e avaliadores de políticas agrícolas, de C&T, inovação e desenvolvimento social.Obra resenhada: NEDER, R. T.; COSTA, F. M. P. (Org.). Ciência tecnologia sociedade (CTS) para a construção da agroecologia. Brasília, DF: Ed. da UnB, 2014 . 261 p. il. (Cadernos construção social da tecnologia, série 1, número 7, primeira versão, 4)

Aplicações de biossensores na análise da qualidade de alimentos.

Biossensores; Classificação de biossensores; Desenvolvimento de biossensores; Aplicaçõs de biossensores; Aplicações de biossensores na indústria de alimentos.bitstream/item/33970/1/Dc-117.pd

Altered proteolytic and amydolytic activity in insecticide-susceptible and -resistant strains of the maize weevil, Sitophilus zeamais

Fitness cost is usually associated with insecticide resistance and may be mitigated by increased energy accumulation and mobilization. Preliminarily evidence from tests with Sitophilus zeamais Motschulsky, the maize weevil (Coleoptera: Curculionidae) suggested possible involvement of proteinases and amylases in such a phenomenon. Therefore, trypsin-like serine-proteinases, cysteine-proteinases and α-amylases were purified and characterized from an insecticide-susceptible and two insecticide-resistant strains (one with associated fitness cost [resistant cost strain], and the other without it [resistant no-cost strain]). Trypsin-like serine-proteinases were purified by aprotinin-agarose affinity chromatography, while cysteine-proteinases were purified using thiol-sepharose affinity chromatography, and the main α-amylase of each strain was purified by glycogen precipitation and ion-exchange chromatography. The activity and inhibition profile differed among strains for each group of purified enzyme. The higher levels of activity observed for trypsin-like proteinases and amylase in the resistant no-cost strain, as well as their susceptibility to inhibition provide support for the hypothesis that enhanced trypsin-like protease and α-amylase activity may be playing a major role in mitigating fitness costs associated with insecticide resistance. In contrast, enhanced cysteine-proteinase activity is likely to play only a secondary role, if any, in mitigating the costs usually associated with insecticide resistance. Keywords: Fitness cost mitigation, Insecticide resistance, Digestive enzymes, Amylases, Proteinases