Bettini, Lorenzo, Rocco de Nicola, Daniele Falassi, Marc Lacoste, Luís Lopes, Licínio Oliveira, Hervé Paulino, and Vasco T. Vasconcelos. "
A Software Framework for Rapid Prototyping Run-Time Systems for Mobile Calculi."
Global Computing: IST/FET International Workshop, GC 2004, Rovereto, Italy, March 9-12, 2004, Revised Selected Papers. Ed. Paola Priami, Corrado; Quaglia. Lecture Notes in Computer Science. Springer-Verlag, 2005. 179-207.
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Salema, M. I. G., APB Póvoa, and A. Q. Novais. "
Design and planning of supply chains with reverse flows."
Computer Aided Chemical Engineering. Eds. Luis Puigjaner, and António Espuña. Vol. 20. Elsevier, 2005. 1075-1080.
AbstractA multi-product model for the design of global supply chains with reverse flows is proposed. Two levels of decisions are considered, one strategic and one tactical. The first is modelled through a macro perspective of time where the determination of the network structure and flows is accomplished. At tactical level, a micro perspective of time is considered, where production planning and inventory management are addressed in detail. A mixed integer linear programming formulation is developed which is solved with standard Branch and Bound techniques. The model accuracy and suitability are studied using a case study.
Salema, Maria Isabel Gomes, A. P. Barbosa-Póvoa, and Augusto Q. Novais. "
Dynamic network design model with reverse flows."
POMS 16th Annual Conference. Vol. 4643. Chicago, USA 2005. 19.
AbstractMuch attention is currently given to the study of supply chains. Most studies are, however, only concerned with forward chains, rendering reverse chains a field insufficiently covered. Few optimization models addressing either the design of reverse networks or the simultaneous design of forward and reverse networks have been presented. We propose a MILP model for the design and planning of an integrated forward and reverse chain. While minimizing cost, the network structure is defined simultaneously with production and storage planning. Dynamic aspects are accounted for using a two-time scale, fully interconnected structure, where at a macro time the network design is performed and at a micro time the planning is optimised. The deterministic model is extended and a scenario approach is applied to account for uncertainties in demand and return of products. A case study is solved and a common structure to all scenarios is obtained, while scenario dependent policies are defined for distribution, production and storage. The model generality is corroborated with good performance results.
Nunes, Isabel L., Pedro Santos, José Henriques, and Carlos Ruas Análise de Riscos numa Empresa do Sector Metalomecânico. [Risk Analysis in a Metalomecanic Company]. Eds. Guedes C. Soares, A. P. Teixeira, and P. Antão. Vol. 1. Análise e Gestão de Riscos, Segurança e Fiabilidade. Proceedings I Encontro Nacional de Riscos, Segurança e Fiabilidade, 1. Ed Salamandra, Lda, 2005.
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Nunes, Isabel L., Pedro Santos, José Henriques, and Carlos Ruas Análise de Riscos numa Empresa do Sector Metalomecânico. [Risk Analysis in a Metalomecanic Company]. Eds. Guedes C. Soares, A. P. Teixeira, and P. Antão. Vol. 1. Análise e Gestão de Riscos, Segurança e Fiabilidade. Proceedings I Encontro Nacional de Riscos, Segurança e Fiabilidade, 1. Ed Salamandra, Lda, 2005.
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Lanca, M. C., E. R. Neagu, and J. N. Marat-Mendes. "
Space charge studies of aged XLPE using combined isothermal and thermostimulated current measurements."
Cross-Disciplinary Applied Research in Materials Science and Technology. Ed. A. MendezVilas. Vol. 480. Materials Science Forum, 480. 2005. 501-505.
AbstractSpace charge in electrically aged cross-linked polyethylene (XLPE) was studied using a procedure combining isothermal and non-isothermal measurements of charge and discharge currents. Aging is carried out using an AC field while immersing the disk-shaped samples in an ionic aqueous solution at constant temperature. After aging the samples were isothermally DC charged and discharged. Next a non-isothermal experiment with constant heating rate was performed (FTSDC). Finally the sample was kept at the highest temperature in order to completely discharge the polymer. The space charge introduced in the XLPE during aging can be analyzed from the study of the FTSDC spectra. The thermogram (FTSDC) shows a very broad peak. The peak is attributed to trapped space charge in traps with long relaxation times. It is possible to decompose it into three or four individual peaks and obtain the corresponding activation energies. The results were compared with previous ones obtained for LDPE (low density polyethylene) aged under similar conditions.
Fortunato, E., P. Barquinha, A. Pimentel, A. Goncalves, A. Marques, L. Pereira, and R. Martins Zinc oxide thin-film transistors. Eds. N. H. Nickel, and E. Terukov. Vol. 194. Zinc Oxide - A Material for Micro- and Optoelectronic Applications, 194., 2005.
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