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Portfolios and the market geometry
Eleutério, Samuel; Araújo, Tanya; Mendes, R. VilelaA geometric analysis of the time series of returns has been performed in the past and it implied that the most of the systematic information of the market is contained in a space of small dimension. Here we have explored subspaces of this space to find out the relative performance of portfolios formed from companies that have the largest projections in each one of the subspaces. It was found that the best perfo...
Effects of different levels of positive airway pressure on breathing pattern an...
Pantoni,C.B.F.; Di Thommazo,L.; Mendes,R.G.; Catai,A.M.; Luzzi,S.; Amaral Neto,O.; Borghi-Silva,A.The application of continuous positive airway pressure (CPAP) produces important hemodynamic alterations, which can influence breathing pattern (BP) and heart rate variability (HRV). The aim of this study was to evaluate the effects of different levels of CPAP on postoperative BP and HRV after coronary artery bypass grafting (CABG) surgery and the impact of CABG surgery on these variables. Eighteen patients und...
Litíase Coraliforme: Caso Clínico Raro e Complicado
Marques, JJ; Muresan, C; Lúcio, R; Almeida, M; Melo, P; Correia, R; Mendes, RIntrodução: Este artigo tem como objectivo apresentar um caso clínico de litíase coraliforme que exemplifica a gravidade resultante desta patologia. Caso Clínico: Caso clínico de uma doente do sexo feminino, 43 anos, sem antecedentes pessoais de relevo, que recorreu ao Serviço de Urgência por prostração, astenia e anorexia. Foi-lhe diagnosticada insuficiência renal grave, litíase coraliforme bilateral e hidrone...
Development of an electrochemical immunosensor for Phakopsora pachyrhizi detect...
Mendes,R. K.; Ferreira,D. C. M.; Carvalhal,R. F.; Peroni,L. A.; Stach-Machado,D. R.; Kubota,L. T.Soybean rust is a disease that occurs on soybean leaves and is considered very aggressive, reducing product quality. Early identification of fungus in the plants prevents severe farming losses as well as spreading to neighboring cultures. In this paper, a label-free immunosensor was developed based on impedance measurements to detect Asian rust on soybean leaf extract at the early stages of the disease. The ant...
q-distributions in complex systems: a brief review
Picoli Jr.,S.; Mendes,R. S.; Malacarne,L. C.; Santos,R. P. B.The nonextensive statistical mechanics proposed by Tsallis is today an intense and growing research field. Probability distributions which emerges from the nonextensive formalism(q-distributions) have been applied to an impressive variety of problems. In particular, the role of q-distributions in the interdisciplinary field of complex systems has been expanding. Here, we make a brief review of q-exponential, q-...
Symbolic sequences and Tsallis entropy
Ribeiro,H. V.; Lenzi,E. K.; Mendes,R. S.; Mendes,G. A.; da Silva,L. R.We address this work to investigate symbolic sequences with long-range correlations by using computational simulation. We analyze sequences with two, three and four symbols that could be repeated l times, with the probability distribution p(l) ∝ 1/l µ. For these sequences, we verified that the usual entropy increases more slowly when the symbols are correlated and the Tsallis entropy exhibits, for a suita...
Generalized entropy indices to measure α- and β-diversities of macrop...
Evangelista,H. B. A.; Thomaz,S. M.; Mendes,R. S.; Evangelista,L. R.A family of entropy indices constructed in the framework of Tsallis entropy formalism is used to investigate ecological diversity. It represents a new perspective in ecology because a simple equation can incorporate all aspects of α-diversity, from richness to dominance and can be also related to a measure of species rarity. In addition, a generalized Kullback-Leibler distance, constructed in the framework...
Shock activation of [alpha]-alumina from calcinated Al-rich sludge
Farinha, A. R.; Ribeiro, J. B.; Mendes, R.; Vieira, M. T.http://www.sciencedirect.com/science/article/B6TWH-4V0MTS0-1/2/e62b6d65e9631a4eb781069d9f088543
Tratamento endodontico como alternativa à extracção: opções de restauro de dent...
Mestrinho, Lisa A.; Batuca, S.; Mendes, R.; Resende, Luís; Viegas, C.A dentisteria e a prostodoncia têm sido recentemente abordadas em Medicina Veterinária em alguns textos e artigos dedicados à especialidade de Medicina Dentária Veterinária. A eleição criteriosa e a execução correcta das técnicas de tratamento do canal pulpar (tratamento endodontico), e de restauro dos dentes endodonciados, têm igual importância na manutenção da integridade das peças dentárias. O presente artig...
Innovation Success and Structural Change: An Abstract Agent Based Study
Araújo, Tanya; Mendes, R. VilelaA model is developed to study the effectiveness of innovation and its impact on structure creation and structure change on agent-based societies. The abstract model that is developed is easily adapted to any particular field. In any interacting environment, the agents receive something from the environment (the other agents) in exchange for their effort and pay the environment a certain amount of value for the ...
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