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A remark on conditioned invariance in the behavioral approach
Pereira, Ricardo; Rocha, PaulaIn this paper a definition for the property of behavioral invariance is proposed with the purpose of generalizing the state space geometric approach to the behavioral setting. Based on this notion together with the well-known notion of behavioral observer, a definition of conditioned invariance is also presented. The results obtained for the characterization of the defined properties put into evidence some prob...
Sistema de multiprocessamento para simulação de N-corpos em FPGA
Pereira, Ricardo Joel MartinsEste projeto tem como objetivo o desenvolvimento de uma arquitetura de multiprocessamento dedicada à simulação de sistemas baseados na interação entre N-corpos. O sistema é desenvolvido numa placa de desenvolvimento com FPGA, tendo por base módulos lógicosdedicados ao cálculo das expressões base da simulação. Escolhido como problema exemplo a evolução de um sistema de interação...
Cofemel´s internationalization plan to Poland
Pereira, Ricardo Jorge CamposA Work Project, presented as part of the requirements for the Award of a Masters Degree in Management from the NOVA – School of Business and Economics. ; Internationalization has become a crucial process for the survival and growth of firms in general so that, this thesis presents an internationalization plan through a franchising strategy for Cofemel. It is a clothing company creator of the brand Tiffosi in 1...
Effect of whey protein purity and glycerol content upon physical properties of ...
Ramos, Óscar L.; Reinas, Isabel; Silva, Sara I.; Fernandes, João C.; Cerqueira, M. A.; Pereira, Ricardo; Vicente, A. A.; Poças, M. FátimaThis manuscript describes the detailed characterization of edible films made from two different protein products e whey protein isolate (WPI) and whey protein concentrate (WPC), added with three levels of glycerol (Gly) e i.e. 40, 50 and 60%(w/w). The molecular structure, as well as barrier, tensile, thermal,surface and optical properties of said films were determined, in attempts to provide a better understand...
Removal of Ni(II) from aqueous solutions by an Arthrobacter viscosus biofilm su...
Quintelas, C.; Pereira, Ricardo; Kaplan, Ecem; Tavares, M. T.This study discusses the retention of Ni(II) by Arthrobacter viscosus supported on zeolite 13 X in batch mode and in continuous mode, at laboratory scale and at pilot scale. The maximum adsorption capacities of 28.37, 20.21 and 11.13 mg/g were recorded for lab scale batch, for continuous lab scale minicolumns and for pilot scale bioreactors, respectively. The Sips isotherm and pseudo second order kinetics descr...
Production of whey protein hydrogels through application of electric fields
Pereira, Ricardo; Ramos, Óscar L.; Rodrigues, Rui; Teixeira, J. A.; Vicente, A. A.Whey protein based gelling systems may present several functional roles in food formulations by enhancing textural properties (e.g. mouthfeel), acting as stabilizing agents or by being used as carrier of bioactive substances (e.g. nutraceuticals). The rates and pathways for the production of a protein gel system are controlled by heating conditions, protein concentration, pH, ionic strength, and solvent medium....
Caracterização das tecnologias de suporte à gestão logística nas empresas de di...
Pereira, Ricardo Gamaliel PiresDissertação de Mestrado em Ciências Empresariais - Ramo Gestão Logística ; Nos últimos anos e agravado pela crise económica atual, o setor farmacêutico sofreu profundas alterações, assistindo-se por isso a uma transferência de stock das farmácias para os distribuidores, passando estes também a desempenhar a função de armazenistas. Este fator obrigou a uma adaptação destes, de modo a torna-los capazes de respon...
Digital Sigma-Delta modulator with high SNR (100dB+)
Pereira, Ricardo Jorge MoreiraTese de mestrado integrado. Engenharia Electrotécnica e de Computadores. Universidade do Porto. Faculdade de Engenharia. 2011
Pigmentação de rochas
Pereira, Ricardo Manuel das NevesTese de mestrado. Engenharia de Minas e Geo-Ambiente. Faculdade de Engenharia. Universidade do Porto. 2009
On the stability of linear fractional difference systems
Vettori, Paolo; Pereira, RicardoA fractional linear system is defined by differential or difference equations of non-integer order. A well-known result about the stability of fractional differential systems will be extended to discrete-time systems defined by fractional difference equations. This will be accomplished using time scales, which permit to unify continuous and discrete-time systems.
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