Comparação entre três perímetros irrigados usando-se os indicadores de desempenho RGC e SAI.

Apesar de vários programas do governo terem sido implementados, ainda existem muitos problemas relacionados ao desempenho dos perímetros irrigados. O estudo de desempenho permitirá fazer comparações de como um sistema tem se comportado em relação a outros similares. A avaliação comparativa fornecerá indicadores totais e onde melhoras podem ser feitas, em termos de manejo do sistema, infra-estrutura ou alocação de água, e permitirá salientar e entender os padrões relacionados ao desempenho. O objetivo deste trabalho foi analisar comparativamente o desempenho dos perímetros irrigados: Projeto de Colonização Paracatu/Entre Ribeiros (pCPER 1); Distrito do Jaíba (DIJ) e Distrito de irrigação Senador Nilo Coelho (DISNIC), usando-se dois indicadores: Razão Global de Consumo (RGC) e Sustentabilidade da Área Irrigada (SAI). Os resultados encontrados permitiram concluir que a RGC apresentou valores máximos de 0,39; 0,56 e 0,75 para o PCPER I, o DISNIC e o DIJ, respectivamente. Dos três perímetros estudados o PCPER I apresentou a melhor taxa de ocupação, seguido do DISNIC e do DIJ, com os valores de 0,97; 0,64 e 0,52, respectivamente

Group theory for structural analysis and lattice vibrations in phosphorene systems

Group theory analysis for two-dimensional elemental systems related to phosphorene is presented, including (i) graphene, silicene, germanene and stanene, (ii) dependence on the number of layers and (iii) two stacking arrangements. Departing from the most symmetric $D_{6h}^{1}$ graphene space group, the structures are found to have a group-subgroup relation, and analysis of the irreducible representations of their lattice vibrations makes it possible to distinguish between the different allotropes. The analysis can be used to study the effect of strain, to understand structural phase transitions, to characterize the number of layers, crystallographic orientation and nonlinear phenomena.Comment: 24 pages, 3 figure

On the quantumness of correlations in nuclear magnetic resonance

Nuclear Magnetic Resonance (NMR) was successfully employed to test several protocols and ideas in Quantum Information Science. In most of these implementations the existence of entanglement was ruled out. This fact introduced concerns and questions about the quantum nature of such bench tests. In this article we address some issues related to the non-classical aspects of NMR systems. We discuss some experiments where the quantum aspects of this system are supported by quantum correlations of separable states. Such quantumness, beyond the entanglement-separability paradigm, is revealed via a departure between the quantum and the classical versions of information theory. In this scenario, the concept of quantum discord seems to play an important role. We also present an experimental implementation of an analogous of the single-photon Mach-Zehnder interferometer employing two nuclear spins to encode the interferometric paths. This experiment illustrate how non-classical correlations of separable states may be used to simulate quantum dynamics. The results obtained are completely equivalent to the optical scenario, where entanglement (between two field modes) may be present

Origin and spectroscopic determination of trigonal anisotropy in a heteronuclear single-molecule magnet

W-band ({\nu} ca. 94 GHz) electron paramagnetic resonance (EPR) spectroscopy was used for a single-crystal study of a star-shaped Fe3Cr single-molecule magnet (SMM) with crystallographically imposed trigonal symmetry. The high resolution and sensitivity accessible with W-band EPR allowed us to determine accurately the axial zero-field splitting terms for the ground (S =6) and first two excited states (S =5 and S =4). Furthermore, spectra recorded by applying the magnetic field perpendicular to the trigonal axis showed a pi/6 angular modulation. This behavior is a signature of the presence of trigonal transverse magnetic anisotropy terms whose values had not been spectroscopically determined in any SMM prior to this work. Such in-plane anisotropy could only be justified by dropping the so-called 'giant spin approach' and by considering a complete multispin approach. From a detailed analysis of experimental data with the two models, it emerged that the observed trigonal anisotropy directly reflects the structural features of the cluster, i.e., the relative orientation of single-ion anisotropy tensors and the angular modulation of single-ion anisotropy components in the hard plane of the cluster. Finally, since high-order transverse anisotropy is pivotal in determining the spin dynamics in the quantum tunneling regime, we have compared the angular dependence of the tunnel splitting predicted by the two models upon application of a transverse field (Berry-phase interference).Comment: 13 pages, 9 figure

Architectural design digital change: interactivity policy

Several researches have been focused on digital architecture historical perspectives of the design throughout the sixties. This paper purposes a different view based on the influence of art, science and computation in architecture that contributed to the use of interactivity in architectural design. The aim is to describe the evolution of interactive CAD from MIT’s Project CAD and Ivan Sutherland’s Sketchpad to the early digital architectural design pioneers: Steven Coons, Gyorgy Kepes and Nicholas Negroponte.info:eu-repo/semantics/publishedVersio

Top quark loop corrections to the decay H+→h0W+H^+ \to h^0 W^+ in the Two Higgs Doublet Model

We calculate the decay width for the process $H^+ \to h^0 W^+$ up to order $g^4$ in the framework of the Two Higgs Doublet Model. We argue that for some reasonable choice of the free parameters the contribution from the one-loop graphs can be as large as 40%.Comment: 9 pages (in a4wide), tex with figures attached, uuencoded tared gzip file Postscript file also available at http://thep.physik.uni-mainz.de/~brueche

Holonomy corrected Schwarzschild black hole lensing

In the present work, we theoretically investigate gravitational lensing in the spacetime of a holonomy corrected Schwarzschild black hole. Analytical expressions for the light deflection angle are obtained in both the weak field limit and the strong field limit. Furthermore, we analyze observables, such as relativistic images and magnifications, and compare the results with those expected in a Schwarzschild spacetime. We discuss the possibilities and difficulties of investigating such a solution in practice

Irradiação de polpa de cupuaçu (Theobroma grandiflorum).

bitstream/item/43259/1/CT163.pd

Influência da irrigação intermitente sobre o avanço e infiltração de água em sulcos, num Latossolo Vermelho-Escuro álico.

Conduziu-se uma pesquisa para avaliar as caracteristicas de avanco e infiltracao de agua em sulcos, num Latossolo Vermelho Escuro alico, utilizando-se irrigacao continua e intermitente. Foram testadas as vazoes de 0,4; 0,8; 1,2/s-1, bem como os tempos ciclicos de 20; 40 e 60 min, com taxa ciclica de 0,5. A velocidade de avanco da agua aumentou com a vazao de 0,4ls-1, nos tres tempos ciclicos, e com a vazao de 0,8ls-1, nos tempos ciclicos de 40 e 60 min, em relacao ao escoamento continuo. Entretanto, nao houve diferenca entre os tempos de avanco, quando se fizeram irrigacoes continua e intermitente, com a vazao de 1,2ls-1. Na primeira aplicacao de agua nos sulcos, os efeitos da irrigacao intermitente foram mais acentuados. Os volumes de agua aplicada, para a conclusao do avanco, foram menores no escoamento intermitente, com a vazao de 0,8ls-1 e nos tempos ciclicos de 40 e 60 min