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Search Results: 1 - 10 of 448046 matches for " L. H. Monken e; "
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Simulation of NaCl and KCl mass transfer during salting of Prato cheese in brine with agitation: a numerical solution
Bona, E.;Carneiro, R. L.;Borsato, D.;Silva, R. S. S. F.;Fidelis, D. A. S.;Silva, L. H. Monken e;
Brazilian Journal of Chemical Engineering , 2007, DOI: 10.1590/S0104-66322007000300004
Abstract: the association of dietary nacl with arterial hypertension has led to a reduction in the levels of this salt in cheeses. for salting, kcl has been used as a partial substitute for nacl, which cannot be completely substituted without affecting product acceptability. in this study a sensorially adequate saline solution (nacl/kcl) was simultaneously diffused during salting of prato cheese in brine with agitation. the simultaneous multicomponent diffusion during the process was modeled with fick?s second generalized law. the system of partial differential equations formed was solved by the finite element method (fem). in the experimental data concentration the deviation for nacl was of 7.3% and for kcl of 5.4%, both of which were considered acceptable. the simulation of salt diffusion will allow control and modulation of salt content in prato cheese, permitting the prediction of final content from initial conditions.
Geometrically induced singular behavior of entanglement
D. Cavalcanti,P. L. Saldanha,O. Cosme,F. G. S. L. Brandao,C. H. Monken,S. Padua,M. Franca Santos,M. O. Terra Cunha
Physics , 2007, DOI: 10.1103/PhysRevA.78.012318
Abstract: We show that the geometry of the set of quantum states plays a crucial role in the behavior of entanglement in different physical systems. More specifically it is shown that singular points at the border of the set of unentangled states appear as singularities in the dynamics of entanglement of smoothly varying quantum states. We illustrate this result by implementing a photonic parametric down conversion experiment. Moreover, this effect is connected to recently discovered singularities in condensed matter models.
Control of conditional pattern with polarization entanglement
D. P. Caetano,C. H. Monken,P. H. Souto Ribeiro
Physics , 2003, DOI: 10.1016/j.optcom.2003.09.016
Abstract: Conditional interference patterns can be obtained with twin photons from spontaneous parametric down-conversion and the phase of the pattern can be controlled by the relative transverse position of the signal and idler detectors. Using a configuration that produces entangled photons in both polarization and transverse momentum we report on the control of the conditional patterns by acting on the polarization degree of freedom.
Image and Coherence Transfer in the Stimulated Down-conversion Process
P. H. Souto Ribeiro,S. Padua,C. H. Monken
Physics , 2000, DOI: 10.1103/PhysRevA.60.5074
Abstract: The intensity transverse profile of the light produced in the process of stimulated down-conversion is derived. A quantum-mechanical treatment is used. We show that the angular spectrum of the pump laser can be transferred to the stimulated down-converted beam, so that images can also be transferred from the pump to the down-converted beam. We also show that the transfer can occur from the stimulating beam to the down-converted one. Finally, we study the process of diffraction through an arbitrarily shaped screen. For the special case of a double-slit, the interference pattern is explicitly obtained. The visibility for the spontaneous emitted light is in accordance with the van Cittert - Zernike theorem for incoherent light, while the visibility for the stimulated emitted light is unity. The overall visibility is in accordance with previous experimental results.
Quantum Erasure by Transverse Indistinguishability
P. H. Souto Ribeiro,S. Padua,C. H. Monken
Physics , 2000, DOI: 10.1016/S0030-4018(00)01050-6
Abstract: We show that the first experiment with double-slits and twin photons detected in coincidence can be understood as a quantum eraser. The ``which path'' information is erased by transverse indistinguishability obtained by means of mode filtering in the twin conjugated beam. A delayed choice quantum eraser based on the same scheme is proposed.
The Semi-Quantum Computer
Reinaldo O. Vianna,Wilson R. M. Rabelo,C. H. Monken
Physics , 2003,
Abstract: We discuss the performance of the Search and Fourier Transform algorithms on a hybrid computer constituted of classical and quantum processors working together. We show that this semi-quantum computer would be an improvement over a pure classical architecture, no matter how few qubits are available and, therefore, it suggests an easier implementable technology than a pure quantum computer with arbitrary number of qubits.
Hyperentanglement-assisted Bell-state analysis
S. P. Walborn,S. Pádua,C. H. Monken
Physics , 2003, DOI: 10.1103/PhysRevA.68.042313
Abstract: We propose a simple scheme for complete Bell-state measurement of photons using hyperentangled states - entangled in multiple degrees of freedom. In addition to hyperentanglement, our scheme requires only linear optics and single photon detectors, and is realizable with current technology. At the cost of additional classical communication, our Bell-state measurement can be implemented non-locally. We discuss the possible application of these results to quantum dense coding and quantum teleportation.
Conservation and entanglement of Hermite-Gaussian modes in parametric down-conversion
S. P. Walborn,S. Pádua,C. H. Monken
Physics , 2004, DOI: 10.1103/PhysRevA.71.053812
Abstract: We show that the transfer of the angular spectrum of the pump beam to the two-photon state in spontaneous parametric down-conversion enables the generation of entangled Hermite-Gaussian modes. We derive an analytical expression for the two-photon state in terms of these modes and show that there are restrictions on both the parity and order of the down-converted Hermite-Gaussian fields. Using these results, we show that the two-photon state is indeed entangled in Hermite-Gaussian modes. We propose experimental methods of creating maximally-entangled Bell states and non-maximally entangled pure states of first order Hermite-Gaussian modes.
Resolu o de equa es diferenciais por redes neurais artificiais: problemas com gradientes elevados e domínios arbitrários = Resolution of differential equations with artificial neural networks: high gradients and arbitrary domains problems
Luiz Henry Monken e Silva,Ivo Neitzel,Ed Pinheiro Lima
Acta Scientiarum : Technology , 2005,
Abstract: Neste artigo a habilidade das redes neurais perceptron multicamada eminterpolar foi utilizada para analisar duas classes de problemas de contorno. A primeira classe é formada por equa es diferenciais em que a solu o pode apresentar gradientes elevados e a segunda classe é formada de equa es diferenciais definidas em domínios arbitrários. As metodologias propostas por Lagaris et al. (1998) foram estendidas para casos de equa es diferenciais sujeitas às condi es de Cauchy e condi es de contorno mistas. Os resultados fornecidos pelo método da rede neural se apresentam precisos quando comparados com os resultados analíticos ou por métodos numéricos de resolu o deequa es diferenciais. A precis o alcan ada nos resultados e a facilidade no manuseio do método para resolver estes problemas de contorno encorajaram a continuidade da pesquisa, particularmente no tocante à convergência e estabilidade numérica. In this paper, the ability of the multilayer perceptron neural network (MLP) in interpolation was used to analyze two classes of boundary value problems. The first class is formed by differential equations, with solutions which can have high gradients and the second are partial differential equations, defined on arbitrary shaped domain. Also, the methodologies proposed by Lagaris et al. (1998) were enlarged for differential equations subjected to Cauchy and mix boundary conditions type. The results of the artificial neural network method are very precise when comparison to the analytical ones or those of classical numerical methods to solve differential equations. The precision achieved in the results and the ability to handle the method, to solve those boundary value problems, were encouraging to keep the research, particularly on an important direction, concerning convergence and numerical stability.
Analysis of the Temporal and Spatial Evolution of Recovery and Degradation Processes in Vegetated Areas Using a Time Series of Landsat TM Images (1986-2011): Central Region of Chihuahua, Mexico  [PDF]
L. C. Alatorre, E. Sánchez, J. P. Amado, L. C. Wiebe, M. E. Torres, H. L. Rojas, L. C. Bravo, E. López, E. López
Open Journal of Forestry (OJF) , 2015, DOI: 10.4236/ojf.2015.52016
Abstract: This paper analyzed the temporal and spatial evolution of vegetation dynamics in various land covers in the basin of the Laguna Bustillos, Region of Cuauhtémoc, Chihuahua, Mexico. We used an NDVI time series for the months of March to April (early spring). The series was constructed from Landsat TM images for the period 1986-2011. The results show an increase of NDVI for vegetated areas, especially in conifer cover, while shrub and grassland showed a positive trend but with lower statistical significance. The increase in minimum temperatures in early spring, during the study period, was the most important factor in explaining the increase of NDVI in vegetated areas. A spatially distributed analysis shows large areas without an NDVI trend, corresponding to areas with sparse vegetation cover (degraded areas). Moreover, there are also areas with a negative trend (loss of vegetation), explained by the exploitation of trees to produce firewood which is mainly carried out by the ejidos in the region. These results help to focus human and financial resources in places where the benefit will be greatest.
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