http://hdl.handle.net/1822/12004 EEUM 2013-05-25T23:15:15Z http://hdl.handle.net/1822/24194 Title: Low temperature solid state processing of pure P3HT fibers Authors: Rodrigues, Alexandre; Nabankur, Deb; Hilliou, L.; Viana, J. C.; Bucknall, David G.; Bernardo, Gabriel Abstract: Fibers of pure poly(3-hexylthiophene) (P3HT) of 1 and 2mm diameter, were produced from solid state processing at temperatures of 200, 150 and 100oC, i.e. up to more than 100 oC below the melting point of P3HT (∼240 oC), using a small device reminiscent with the early stage polymer extrusion machines. The fibers produced by this method are continuous and mechanically robust.WAXS results show that the macromolecular chains of P3HT are preferably oriented along the fiber axis. This study clearly shows, for the first time, that P3HT fibers can be processed without solvents well below the polymer’s melting temperature. 2013-05-09T00:00:00Z http://hdl.handle.net/1822/24183 Title: Design of a new foot stirrup model for funcional ortopaedic footwear Authors: Peixoto, Joaquim; Moura, Bruno Emanuel Novo de; Flores, Paulo; Souto, A. Pedro Abstract: The main aim of this work is present the development and early results of a new solution for an orthopedic footwear stirrup. For this purpose, conventional solutions are briefly characterized in order to identify the main causes for their frequent failure. This task also allows for the identification of the list the principal criteria to be considered in the design process of the new geometric configuration, namely, aspects related to functionality, flexibility and durability. In addition, a biomechanical analysis is performed with the intent to typify the main variables associated with the human gait, such as the developed loads. Then, computational simulations, based on the finite element approach, are performed to test the several options considered that permits the quantification of the level of stresses developed and, consequently, the selection of the best solution. The obtained results showed that the new geometric solution is feasible with a light foot stirrup. The performance of the stirrup model proposed is analysed in light of the assumptions and procedure adopted in this work, being the early results quite satisfactory in terms of comfort and durability. 2013-01-01T00:00:00Z http://hdl.handle.net/1822/24182 Title: Aplication of breathable and odorless lining to orthopaedic shoes Authors: Peixoto, Joaquim; Souto, A. Pedro; Flores, Paulo Abstract: The main purpose of this work is to apply new materials and new finishing to improve comfort in orthopaedic footwear associated with orthosis. This desideratum will be reached through the selection and application of advanced materials, such, breathables membranes and fabric finished with anti-fungal and anti-bacteria treatments. In this work, water vapor permeability was evaluated to determine the transport property of water vapor produced by transpiration of the skin. A new lining with breathable membrane and anti-odour finishing has been developed and tested. Water vapor permeability of the new lining was compared with a commercial leather lining, commercial lining with breathable membrane - AquaStopT, breathable membrane and weave fabric. The possibility to use fabrics with anti-odour finishing’s, laminated with a hydrophilic breathable membrane, for lining proposes has been demonstrated. Application of membranes with weave fabric by lamination decreases the breathability of materials, nevertheless, the lining with hydrophilic (LF) membrane and the leather’s lining have similar values for water vapor permeability, with the advantage that LF is impermeable. 2011-10-20T00:00:00Z http://hdl.handle.net/1822/24160 Title: Seminário Anual de Automação, Eletrónica Industrial e Instrumentação : livro de atas Authors: Couto, Carlos, ed. lit.; Lago Ferreiro, Alfonso, ed. lit.; Nogueiras Meléndez, Andrés, ed. lit.; Martins, Júlio S., ed. lit.; Afonso, João L., ed. lit.; SAAEI 2012; Seminário Anual de Automática, Electrónica Industrial e Instrumentação, Guimarães, 2012; SAAEI'12 2012-01-01T00:00:00Z http://hdl.handle.net/1822/24146 Title: Condicionadores ativos de potência para mitigação de problemas de qualidade de energia elétrica em instalações industriais Authors: Pinto, J. G.; Gonçalves, Henrique; Afonso, João L. Abstract: Os condicionadores ativos são equipamentos baseados em eletrónica de potência que permitem mitigar de forma dinâmica diversos problemas nas tensões e nas correntes do sistema elétrico, contribuindo efetivamente para a melhoria da produtividade das indústrias, reduzindo os prejuízos provocados pelos problemas de Qualidade de Energia Elétrica. 2013-03-01T00:00:00Z