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Concave Minimum Cost Network Flow Problems Solved with a Colony of Ants

Marta R. Monteiro; Dalila Fontes; Fernando A. C. C. Fontes

In this work we address the Single-Source Uncapacitated Minimum Cost Network Flow Problem with concave cost functions. This problem is NP-hard, therefore we propose a hybrid heuristic to solve it. Our goal is not only to apply an Ant Colony Optimization (ACO) algorithm to such a problem, but also to provide an insight on the behaviour of the parameters in the performance of the algorithm. The performance of the...


Olive mill wastewater anaerobically digested : phenolic compounds with antiradi...

La Cara, Francesco; Ionata, Elena; Del Monaco, Giovanni; Marcolongo, Loredana; Gonçalves, Marta R.; Marques, I. P.

The recovery of phenolic compounds, present in the olive fruits and its by-products, has been intensively studied by the antioxidant properties. Olive mill wastewater (OMW) is a phenolic-rich industrial effluent that can be advantageously valorized by the anaerobic digestion to the methane and agricultural fertilizer productions. The objective of this work was to evaluate the antiradical activity of OMW after a...


Strategies for lipids and phenolics degradation in the anaerobic treatment of o...

Gonçalves, Marta R.; Costa, J. C.; Marques, I. P.; Alves, M. M.

Strategies are proposed for the anaerobic treatment of lipid and phenolic-rich effluents, specifically the raw olive mill wastewater (OMW). Two reactors were operated under OMW influent concentrations from 5 to 48 g COD L-1 and Hydraulic Retention Time between 10 and 5 days. An intermittent feeding was applied whenever the reactors showed a severe decay in the methane yield. This strategy improved the mineraliz...


Bioenergy recovery from olive mill effluent in a hybrid reactor

Gonçalves, Marta R.; Freitas, P.; Marques, I. P.

An anaerobic hybrid reactor was tested in the treatment of raw olive mill effluent (OME)without water dilution, chemical correction and any pretreatment. A feeding strategy was applied by increasing progressively the OME volume fraction from 8% to 83% in the feed mixture combined with an OME complementary substrate (piggery effluent). A biogas production of 3.16 m3 m-3 d-1 was achieved at an organic loading rat...


Epilepsia por Agua Caliente. Una Forma Rara de Epilepsia Refleja

Marta, R; Garcia, P; Fernandes, V; Rocha, S; Rodrigues, E




Teste de susceptibilidade ao nemátode da madeira do pinheiro (Bursaphelenchus x...

Lima, Marta R. M.; Ramos, Miguel; Sampedro, Luís; Moreira, Xoaquín; Zas, Rafael; Vasconcelos, Marta W.


Study of symptoms and gene expression in four Pinus species after pinewood nema...

Franco, Albina R.; Santos, Carla; Roriz, Mariana; Rodrigues, Rui; Lima, Marta R. M.; Vasconcelos, Marta W.

Pine wilt disease, caused by the pinewood nematode Bursaphelenchus xylophilus (Steiner and Buhrer) Nickle, is originating severe infections in pine trees. The disease is detected when external symptoms appear (e.g. needle chlorosis), but trees could remain asymptomatic for long periods and serve as a long-term host. The primary goal of this study was to assess the effect of inoculation with an avirulent isolate...


Conhecimento dos pacientes sobre anticoagulação oral crônica acompanhados em am...

Henn, Clarissa de Borba; Silva, Eneida Rejane Rabelo da; Boaz, Marta R.; Souza, Emiliane Nogueira de

Estudo desenvolvido com o objetivo de verificar o conhecimento de pacientes acompanhados em ambulatório sobre a terapêutica com anticoagulação oral. Foi utilizado um questionário elaborado para este estudo composto de dez questões com respostas fechadas. O acerto mínimo de 80% das questões caracterizou um conhecimento satisfatório. Dos 120 pacientes avaliados, a maioria, 77 pacientes (64,1%), obteve conheciment...

Data: 2010   |   Origem: OASIS br

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    Financiadores do RCAAP

Fundação para a Ciência e a Tecnologia Universidade do Minho   Governo Português Ministério da Educação e Ciência Programa Operacional da Sociedade do Conhecimento União Europeia