Crystal ball, virtual gallery C reation system for immersive environments

This paper presents a concept and a tool suite for authoring, configuring, organizing and displaying 3D virtual galleries, depicting multimedia content, like art, picture, movie or any other kind of media, which are appropriate for large-scale immersive virtual environments such as the CAVE™. A comparison was established by the authors with standard PC environments while experimenting virtual environments produced by Crystal Ball, showing the superior experience obtained by an installation of the type of CAVE™ that is in operation at Lousal, south of Portugal.info:eu-repo/semantics/publishedVersio

Diluted antiferromagnet in a ferromagnetic enviroment

The question of robustness of a network under random ``attacks'' is treated in the framework of critical phenomena. The persistence of spontaneous magnetization of a ferromagnetic system to the random inclusion of antiferromagnetic interactions is investigated. After examing the static properties of the quenched version (in respect to the random antiferromagnetic interactions) of the model, the persistence of the magnetization is analysed also in the annealed approximation, and the difference in the results are discussed

Frequency up- and down-conversions in two-mode cavity quantum electrodynamics

In this letter we present a scheme for the implementation of frequency up- and down-conversion operations in two-mode cavity quantum electrodynamics (QED). This protocol for engineering bilinear two-mode interactions could enlarge perspectives for quantum information manipulation and also be employed for fundamental tests of quantum theory in cavity QED. As an application we show how to generate a two-mode squeezed state in cavity QED (the original entangled state of Einstein-Podolsky-Rosen)

Fish-based groups for ecological assessment in rivers: the importance of environmental drivers on taxonomic and functional traits of fish Assemblages

The use of river-types is of practical value, serving as groups for which assessment procedures can be developed and applied. An abiotic typology was set by the Portuguese Water Agency, mainly based on 6 major morphoclimatic regions. However, to be biologically meaningful, this typology should fit the distribution patterns of the biological quality elements communities proposed in Water Framework Directive under the lowest possible human pressure. This study aimed to identify and characterize fish-based geographical groups for continental Portugal and their environmental and geographical discriptors, using taxonomic and functional traits. Sampling took place between 2004 and 2006 during Spring. Fish fauna from 155 reference sites was analysed using a multivariate approach. Cluster Analysis on fish composition identified 10 fish-groups, expressing a clear correspondence to the river basin level, due to the restrict basin distribution of many species. Groups showed a wider aggregation in 4 regions with a larger geographical correspondence, statistically supported by Similarity Analysis, both on fish composition and mostly on fish metrics/guilds. Principal Components Analysis revealed major environmental drivers associated to fish-groups and fish-regions. Fish-groups were hierarchically grouped over major and local regions, expressing a large-scale response to a North-South environmental gradient defined by temperature, precipitation, mineralization and altitude, and a regional scale response mainly to drainage area and flow discharge. From North to South, fish-regions were related to the morphoclimatic regions. Results contributed to reduce redundance in abiotic river-types and set the final typology for Portuguese rivers, constituting a fundamental tool for planning and managing water resources

Desenvolvimento de mistura para bolo com farinhas de quirera de arroz e bandinha de feijão.

o presente trabalho teve como objetivo desenvolver uma pré-mistura para bolo substituindo a farinha de trigo, em diversas porcentagens, por diferentes proporções das farinhas de quirera de arroz e de ?bandinha? de feijão, e avaliar tecnologicamente as formulações por meio das análises de volume específico, umidade, atividade de água, textura e análise sensorial.bitstream/item/27248/1/comt193.pd

Potencial de aproveitamento de farinhas de quirera de arroz e bandinha de feijão em biscoitos tipo cookie.

Tendo em vista a crescente demanda da indústria alimentícia pelo desenvolvimento de novos produtos, com ênfase no mercado consolidado de biscoitos, o interesse dos consumidores por produtos com valor nutricional agregado, o potencial de aproveitamento dos subprodutos do beneficiamento do arroz e do feijão e, benefícios à saúde de consumidores especiais como os celíacos, objetivou-se verificar a viabilidade quanto às características tecnológicas e sensoriais da substituição da farinha de trigo por farinha de arroz e de feijão na elaboração de biscoitos tipo cookie.bitstream/item/56167/1/comunicadotecnico-204.pd

Decoherence of Semiclassical Wigner Functions

The Lindblad equation governs general markovian evolution of the density operator in an open quantum system. An expression for the rate of change of the Wigner function as a sum of integrals is one of the forms of the Weyl representation for this equation. The semiclassical description of the Wigner function in terms of chords, each with its classically defined amplitude and phase, is thus inserted in the integrals, which leads to an explicit differential equation for the Wigner function. All the Lindblad operators are assumed to be represented by smooth phase space functions corresponding to classical variables. In the case that these are real, representing hermitian operators, the semiclassical Lindblad equation can be integrated. There results a simple extension of the unitary evolution of the semiclassical Wigner function, which does not affect the phase of each chord contribution, while dampening its amplitude. This decreases exponentially, as governed by the time integral of the square difference of the Lindblad functions along the classical trajectories of both tips of each chord. The decay of the amplitudes is shown to imply diffusion in energy for initial states that are nearly pure. Projecting the Wigner function onto an orthogonal position or momentum basis, the dampening of long chords emerges as the exponential decay of off-diagonal elements of the density matrix.Comment: 23 pg, 2 fi

Caracterização floral de acessos de cupuaçuzeiro procedentes do município de Nova Ipixuna, Pará.

O cupuaçuzeiro, dentre todas as espécies do seu gênero, é o que apresenta as maiores flores. Nas coleções é possível observar variação para esse componente estrutural, que poderá ser utilizada na discriminação dos genótipos. Esta pesquisa objetivou caracterizar os acessos coletados em populações nativas, ainda remanescentes, no município de Nova Ipixuna - Pará. O experimento encontra-se implantado a campo, na forma de teste clonal. Foram caracterizados 20 acessos, na forma de clones, empregando-se 16 descritores florais, no delineamento experimental de blocos casualizados, com três repetições. Cada repetição era constituída por uma planta, e em cada planta foram empregadas cinco flores/botões, totalizando 15 flores/botões por acesso. Para transformar as informações quantitativas em qualitativas foi calculada a média e o desvio-padrão de cada uma das variáveis florais. A partir dessas informações foram estimados os limites superior e inferior de advertência, definindo-se as categorias de cada descritor. Essas definições foram empregadas na caracterização dos acessos. Com isso foi obtido o perfil de cada acesso com base nos descritores florais estudados. Essas informações permitirão conhecer a proximidade genética dos acessos, subsídio importante para nortear os trabalhos de recursos genéticos e melhoramento da espécie