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- C K V Nonaka, A M G Oliveira, +6 authors P G Dias
- Food additives & contaminants. Part A, Chemistry…
- 2012

Brazil is one of the most important countries as a producer and exporter of cattle and poultry. In 2009 cattle accounted for 30% of the export market and 41.4% for poultry meat. The Brazilian National Residues and Contaminants Control Plan (PNCRC) follows the guidelines set by the Codex Alimentarius Commission and checks compliance maximum residue limits… (More)

- Sérgio A Matos, Marco A Ribeiro, Carlos R Paiva
- Optics express
- 2007

The most widespread approach to anisotropic media is dyadic analysis. However, to get a geometrical picture of a dielectric tensor, one has to resort to a coordinate system for a matrix form in order to obtain, for example, the index-ellipsoid, thereby obnubilating the deeper coordinate-free meaning of anisotropy itself. To overcome these shortcomings we… (More)

Using a modified version of the split-step Fourier method, we analyze the effect of noise on soliton propagation inside erbium-doped fiber amplifiers. In fact, noise from forward-propagating amplified spontaneous emission, associated with a Markov immigration process, is included in the analysis of soliton amplification. Moreover, this algorithm accounts… (More)

A unified framework to optimize power discrimination for self-routing switching of solitonlike pulses in multiple-core fiber arrays is presented. This framework, based on the variational approach, is applicable to all-optical switching in N-core nonlinear fiber arrays for any configuration of the cores. By defining a quality factor as the product of the… (More)

- C R Paiva, A L Topa, A M Barbosa
- Optics letters
- 1992

The occurrence of semileaky waves in dielectric chirowaveguides is investigated. It is shown that a thinfilm dielectric chiroslabguide with an achiral superstrate and in which both the film and substrate are chiral can support semileaky modes radiating energy into the substrate, provided that the chirality parameters are properly chosen.

In this paper, all-optical logical gates based on mismatched nonlinear two-core fiber couplers are proposed. In these devices, solitonlike logical input pulses are shown to avoid pulse breakup to perform logical operations. The mismatched two-core fiber couplers can be produced through slightly different cores embedded in the same cladding. In this… (More)

- Filipa R. Prudencio, Sergio A. Matos, Carlos R. Paiva
- IEEE Transactions on Microwave Theory and…
- 2014

Duality transformations are of key importance in the study of Tellegen (i.e., achiral and nonreciprocal biisotropic) media: they often can reduce electromagnetic problems with both Tellegen media and simple isotropic media (SIMs), to simpler problems just with SIMs. Here, we generalize known results and derive the most general classes of Tellegen media that… (More)

- S. A. Matos, C. R. Paiva
- 2011

The study of conical refraction for media other than biaxial non-magnetic crystals has never been considered in the literature – as far as the authors are aware. Hence, in this paper, we investigate how conical refraction can arise for broader classes of biaxial metamaterials using a new classification scheme previously developed by the authors. Namely,… (More)

- Sergio A. Matos, Carlos R. Paiva, Afonso M. Barbosa
- 2010 URSI International Symposium on…
- 2010

Moving isotropic media are analyzed considering superluminal phase velocities instead of the usual subluminal regime. The following new effects arise: i) a complex aberration, i.e., angles that are complex in the proper frame can correspond to real angles in the lab frame; ii) Cerenkov effect occurs although the usual condition associated with this effect,… (More)

A Lagrangian formulation is used to describe the dynamics of a two-channel, filtered and periodically amplified, dispersion managed soliton system. Two-step periodic dispersion maps that minimize residual time displacements due to inter-channel collisions are obtained.