Active Galactic Nuclei with Starbursts: Sources for Ultra High Energy Cosmic Rays

Ultra high energy cosmic ray events presently show a spectrum, which we interpret here as galactic cosmic rays due to a starburst in the radio galaxy Cen A pushed up in energy by the shock of a relativistic jet. The knee feature and the particles with energy immediately higher in galactic cosmic rays then turn into the bulk of ultra high energy cosmic rays. This entails that all ultra high energy cosmic rays are heavy nuclei. This picture is viable if the majority of the observed ultra high energy events come from the radio galaxy Cen A, and are scattered by intergalactic magnetic fields across most of the sky.Comment: 4 pages, 1 figure, proceedings of "High-Energy Gamma-rays and Neutrinos from Extra-Galactic Sources", Heidelber

Signature of the interaction between dark energy and dark matter in observations

We investigate the effect of an interaction between dark energy and dark matter upon the dynamics of galaxy clusters. This effect is computed through the Layser-Irvine equation, which describes how an astrophysical system reaches virial equilibrium and was modified to include the dark interactions. Using observational data from almost 100 purportedly relaxed galaxy clusters we put constraints on the strength of the couplings in the dark sector. We compare our results with those from other observations and find that a positive (in the sense of energy flow from dark energy to dark matter) non vanishing interaction is consistent with the data within several standard deviations.Comment: 13 pages, 3 figures; matches PRD published versio

Sensory evaluation and cooking properties of macaroni at basis of brazil nut (Bertholetia excelsa) and peach palm fruit (Bactris gasipaes, Kunt) flours.

The Brazil nut tree, Bertholletia excelsa HBK, is explored throughout the Amazon region and its main characteristic is high content of lipids and proteins, they consist of sulfur amino acids of high biological value. The peach palm, Bactris gasipases, Kunth, is a native palm to the same region, that is grown for heart-of-palm extraction. Their fruits are mostly protein, vitamin A and fiber. The way of adding commercial value from co-products to Brazil nut processing is flour productian. That way the Brazil nut flour, for its high nutritional value and pleasant taste was used in macaroni production, along with peach palm fruit flour to improve the nutritianal properties of final product

Germinação e multiplicação in vitro de mandacaruzinho.

Para que o aproveitamento do potencial ornamental dos cactos nativos seja realizado de modo sustentável, torna-se necessário conhecer métodos de propagação alternativos e mais eficientes. Nesse sentido, a micropropagação pode ser uma técnica viável, uma vez que vem sendo amplamente utilizada na produção de mudas de espécies ornamentais, bem como para a conservação de cactáceas nativas.bitstream/item/78049/1/Ana-Valeria-COT152.pd

Propagação vegetativa do alecrim de tabuleiro visando a produção comercial de mudas.

Suplemento. Edição dos Anais do 52 Congresso Brasileiro de Olericultura, Salvador, jul. 2012

Efeito de diferentes concentrações de ácido indol butírico no enraizamento de estacas de Croton heliotropiifolius Kunth.

O objetivo do trabalho foi avaliar o efeito de diferentes concentrações de ácido indol butírico (AIB) no enraizamento de estacas apicais e medianas de velam

Spin-polarized current and shot noise in the presence of spin flip in a quantum dot via nonequilibrium Green's functions

Using non-equilibrium Green functions we calculate the spin-polarized current and shot noise in a ferromagnet--quantum-dot--ferromagnet (FM-QD-FM) system. Both parallel (P) and antiparallel (AP) magnetic configurations are considered. Coulomb interaction and coherent spin-flip (similar to a transverse magnetic field) are taken into account within the dot. We find that the interplay between Coulomb interaction and spin accumulation in the dot can result in a bias-dependent current polarization $\wp$. In particular, $\wp$ can be suppressed in the P alignment and enhanced in the AP case depending on the bias voltage. The coherent spin-flip can also result in a switch of the current polarization from the emitter to the collector lead. Interestingly, for a particular set of parameters it is possible to have a polarized current in the collector and an unpolarized current in the emitter lead. We also found a suppression of the Fano factor to values well below 0.5.Comment: Published version. 13 pages, 7 figure

Influência da secagem e do tempo de extração no rendimento de óleo essencial de Croton blanchetianus Baill.

O objetivo do trabalho foi avaliar a influência da secagem e do tempo de extração das raspas do caule de marmeleiro, a fim de otimizar o rendimento do óleo essencial