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(A, B)-Invariance conditions of polyhedral domains for continuous-time systems

Dorea, Carlos Eduardo Trabuco; Hennet, J. C. (European Journal of Control, 1999)

This paper provides an explicit characterisation of the (A,B)-invariance property of polyhedral sets with respect to linear continuous-time systems. A typical application of the concept of (A,B)-invariance is to investigate ...
(A, B)-invariant polyhedral sets of linear discrete-time systems

Dorea, Carlos Eduardo Trabuco; Hennet, J. C. (1999)

The problem of confining the trajectory of a linear discrete-time system in a given polyhedral domain is addressed through the concept of (A, B)-invariance. First, an explicit characterization of (A, B)-invariance of convex ...
An explicit physical model for the long-channel MOS transistor including small-signal parameters

Cunha, Ana Isabela Araújo; Schneider, Marcio Cherem; Galup-Montoro, Carlos (Solid-State Electronics, 1995)

This paper presents a long-channel MOSFET model wherein the drain current, total charges and small-signal parameters for quasi-static operation are very simple functions of the inversion charge densities at the channel ...
An MOS transistor model for analog circuit design

Cunha, Ana Isabela Araújo; Schneider, Marcio Cherem; Galup Montoro, Carlos (1998)

This paper presents a physically based model for the metal-oxide-semiconductor (MOS) transistor suitable for analysis and design of analog integrated circuits. Static and dynamic characteristics of the MOS field-effect ...
Analysis of exact linearization and aproximate feedback linearization techniques

Schnitman, Leizer; Cardoso, Gildeberto de Souza (Brasil, 2011)

This paper presents a study of linear control systems based on exact feedback linearization and approximate feedback linearization. As exact feedback linearization is applied, a linear controller can perform the control ...
Analysis of the formation of a vinyltrimethoxysilane film on 1010 carbon steel using electrochemical techniques

Fernandes, Bruno Souza; Souza, Kleber Gustavo da Silva; Aoki, Idalina Vieira; Amado, Franco Dani Rico (2013)

Purpose – The application of coatings on metal substrates can provide an increase in corrosion resistance in the environment where the material is employed. The use of silane causes low environmental impact and may represent ...
Artificial neural networks for the chromatic dispersion prediction of photonic crystal fibers

Rodríguez-Esquerre, Vitaly Félix; Lima, J. J. Isídio; Dourado-Sisnando, A.; Silva, F. G. Simões (2013-09)

Multilayer perceptron artificial neural networks have been used for the efficient evaluation and prediction of the chromatic dispersion properties of microstructured optical fibers, with very low computational resources ...
Aspects of the anodic behaviour of duplex stainless steels aged for long periods at low temperatures

Sousa, Carlos Alberto Caldas de; Kuri, Sebastião Elias; May, J. E. (2003)

Duplex stainless steel samples were aged at low temperatures (300 and 400 °C) for 1000 and 2000 h. Their anodic behaviour was studied in a 0.1 N concentration of sulphuric acid, which revealed that the polarisation curves ...
CMOS multiplier based on the relationship between drain current and inversion charge

Machado, M. B.; Cunha, A. I. A.; Lacerda, L. A. de; Galup Montoro, C.; Schneider, Marcio Cherem (2009)

The authors propose a four-quadrant multiplier based on a core cell that exploits the general relationship between the saturation current of an MOS transistor and the source inversion charge density, valid from weak to ...
Comments on “intelligent optimal control of robotic manipulator using neural networks”

Cerqueira, Jés J. F.; Jungbeck, Mario (2002)

This note points out that the proof of Theorem 3 in Kim, Lewis, and Dawson (Automatica 36(9) 1355) has a mistake. Additionally, it is presented as the correction of the theorem.
A comparative analysis of Krylov Solvers for three-dimensional simulations of borehole sensors

Novo, Marcela S.; Silva, Luiz C. da; Teixeira, Fernando L. (2011-01)

We perform a comparative analysis of three Krylov subspace methods, viz., the restarted generalized minimum residual (RGMRES), the conjugate gradient squared (CGS), and the stabilized biconjugate gradient (Bi-CGSTAB), for ...
A constant temperature operation thermoresistive sigma–delta solar radiometer

Oliveira, Amauri; Palma, Lígia Souza; Costa, Alexandre S.; Freire, Raimundo C. S.; Lima, Antonio Cezar de Castro (2006)

In this paper we propose a feedback system, with thermoresistive sensor, based on sigma–delta modulation. This system uses an one-bit sigma–delta modulator in which considerable part of conversion functions is performed ...
Coupling properties of directional couplers based on special waveguides

Rodríguez-Esquerre, Vitaly Félix; Oliveira, Ana Júlia Rodrigues Fernandes de; Costa, Matheus Silva; Souza, Lucas Uzêda (2013-05)

The coupling characteristics of a novel kind of directional couplers composed by two parallel non-conventional waveguides are theoretically analyzed in details.The coupling length as a function of the operating wavelength ...
Covariance management based RLS algorithm for phasor estimation in severely noisy systems

Almeida, Luiz Alberto Luz de; Lima, Antonio Cezar de Castro (1998-10)

This paper presents a new algorithm, derived from the recursive least squares (RLS), to estimate power system voltage and current harmonics for digital relay purposes. The algorithm is based on the RLS covariance matrix ...
dc-Sheet resistance as sensitive monitoring tool of protein immobilization on thin metal films

Almeida, Luiz Alberto Luz de; Neff, Helmut Franz; Beeby, T.; Lima, A. M. N.; Borre, M.; Thirstrup, C.; Zong, W. (2006)

The suitability of high resolution, in situ dc-sheet resistance monitoring (SRM) as a simplified and reliable sensing technique towards detection and tracking of protein immobilization has been explored. Non-specific ...
Decision support system for ultrasound inspection of fiber metal laminates using statistical signal processing and neural networks

Simas Filho, Eduardo Furtado de; Souza, Yure Nascimento de; Lopes, Juliana Lima da Silva; Farias, Cláudia Teresa Teles; Albuquerque, Maria Cléa Soares de (2013)

The growth of the aerospace industry has motivated the development of alternative materials. The fiber–metal laminate composites (FML) may replace the monolithic aluminum alloys in aircrafts structure as they present some ...
Decision support system for ultrasound inspection of fiber metal laminates using statistical signal processing and neural networks

Simas Filho, Eduardo Furtado de; Souza, Yure Nascimento de; Lopes, Juliana Lima da Silva; Farias, Cláudia Teresa Teles; Albuquerque, Maria Cléa Soares de (Ultrasonics, 2013)

The growth of the aerospace industry has motivated the development of alternative materials. The fiber–metal laminate composites (FML) may replace the monolithic aluminum alloys in aircrafts structure as they present some ...
Derivation of the unified charge control model and parameter extraction procedure

Cunha, Ana Isabela Araújo; Schneider, Marcio Cherem; Montoro, Carlos Galup (1999)

This paper presents a physical derivation of the unified charge control model (UCCM) [Park C-K, Lee C-Y, Lee K, Moon B-J, Byun YH, Shur M. IEEE Trans Electron Dev 1991;ED-38:399; Lee K, Shur M, Fjeldly TA, Ytterdal T. ...
Desenvolvimento de um tomógrafo ultrassônico para simulação do monitoramento dinâmico de injeção de CO2 em reservatórios de hidrocarbonetos

Oliveira, Amauri; Santos, Eduardo T. F. (Brasil, 2012-08)

O principal objetivo deste artigo é apresentar o desenvolvimento de um tomógrafo ultrassônico que simula o monitoramento dinâmico da injeção de CO2 em um reservatório de hidrocarbonetos. É proposto o uso de tomografia ...
Design and chromatic aberration analysis of plasmonic lenses using the finite element method

Mercedes, Cosme E. Rubio; Rodríguez-Esquerre, Vitaly Félix; Lima Junior, Ivan T.; Hernández-Figueroa, Hugo E. (2013)

We designed plasmonic lenses and analyzed their chromatic aberration using the finite element method (FEM) in frequency domain with perfectly matched layers (PML). Plasmonic lenses permit subwavelength focusing of light ...

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