Encontrados 31 documentos, a visualizar página 1 de 4
Satellite-derived estimation of environmental suitability for malaria vector de...
Benali, Akli; Nunes, J.P.; Freitas, F.B.; Sousa, C.A.; Novo, M.T.; Lourenço, P.M.; Lima, J.C.; Seixas, J.; Almeida, A.P.G.Malaria was endemic in Europe for more than two millennia until it was eradicated in the 1970s. Recent autochthonous cases registered in Greece have increased the awareness regarding the threat of malaria re-emergence in Southern Europe. Currently, the presence of competent vectors, suitable environmental conditions and the evidences of a changing climate may increase the widespread re-emergence of malaria in S...
Improving the dynamical behaviour of a laser cutting equipment by using a carbo...
Vieira, D. G.; Meireles, José F.; Nunes, J. P.In order to improve the dynamic behaviour of an industrial laser cutting equipment a sandwich solution, using a carbon fibre reinforced polymer (CFRP) and polyester foam core, was implemented to construct its main runway structural frame, which supports the cutting head and major laser beam mirrors and lens. Nowadays, the commercial competiveness of laser cutting equipments is considerable enhanced by their hig...
Production of thermoplastic matrix towpregs for highly demanding and cost-effec...
Nunes, J. P.; Silva, J. F.This work reviews the work made in last years to produce thermoplastic matrix towpregs to highly demanding and more cost-effective commercial applications using a powder coating technology developed in Portugal by Minho and Porto Universities. Different thermoplastic matrices and continuous fibre reinforcements were used in the towpregs produced for highly demanding markets (e.g., carbon fibre reinforced Primos...
Processing conditions and properties of continuous fiber reinforced GF/PP therm...
Nunes, J. P.; Silva, J. F.; Novo, Paulo; Marques, A. T.The aim of the present work was to study and compare the processing conditions and final mechanical properties of continuous glass-fiber reinforced polypropylene composites (GF/PP) manufactured by using available thermoplastic preimpregnated materials produced by different methods.To assess the quality of the three different GF/PP pre-impregnated materials, final manufactured composite parts were submitted to m...
Composite pressure vessels for commercial applications
Nunes, J. P.; Oliveira, Luís; Silva, J. F.; Barros, B.; Amorim, Luís Manuel Machado de; Vasconcelos, M.A new generation of composite pressure vessels for large scale market applications has been studied in this work. The vessels consist on a plastic liner wrapped with a filament winding glass fibre reinforced polymer matrix structure. A polyethylene (PE) was selected as liner for water at room temperatures applications and a thermosetting resin was used as matrices in the glass reinforced filament wound laminate...
Processing and properties of natural fibers reinforced thermoplastic and thermo...
Silva, J. F.; Nunes, J. P.; Duro, A. C.; Castro, B. F.In this work, three different natural fibers were studied and characterized, using optical and SEM microscopy. Woven fabrics of those reinforcement fibers were used to reinforce polyester and epoxy matrices and produce composite plates by vacum lay-up. Also, using an experimental piston blender equipment, long fiber reinforced PLA (LFT) composites were manufactured by hot compression molding. All different obta...
Production of thermoplastic matrix pre-impregnated materials to manufacture com...
Tinoco, V.; Novo, Paulo; Nunes, J. P.; Silva, J. F.; Marques, A. T.The aim of the work was optimizing the continuous production of new continuous carbon fibers reinforced polypropylene matrix pre-impregnated materials (towpregs). This raw-material, produced by dry deposition of polypropylene (PP) powder in an equipment built by the Institute for Polymers and Composites (IPC), was used to manufacture composite pultruded profiles in a recently developed prototype equipment assem...
Processing and properties of composites obtained from natural fibres and thermo...
Duro, A. C.; Castro, B. F.; Silva, J. F.; Nunes, J. P.In this work, different natural fibres were studied and characterized, using optical and SEM microscopy. Those fibres were used to reinforce polyester and epoxy matrices and produce composite plates by hand lay-up. A vacuum bag was then used to allow improving the fibre impregnation, establishing a controlled pressure atmosphere. All different obtained composite plates were submitted to mechanical testing, in o...
Comparing the performance of different thermoplastic matrix pre-impregnated mat...
Santos, M. S.; Nunes, J. P.; Silva, J. F.; Novo, Paulo; Marques, A. T.This work studies and compares the processability into final composite parts of three different pre-impregnated materials, produced by different wetting techniques. All studied pre-impregnated materials were based on a continuous glass fibers reinforced polypropylene matrix (GF/PP) system. One is a tape produced in a previous work by using the melting process (cross-head extrusion) and, from the other two produ...
A mechanical analysis of polydicyclopentadiene with metal inserts through flexu...
Camboa, André; Ribeiro, Bernardo Sousa; Nunes, J. P.; Alves, Jorge LinoPolydicyclopentadiene (PDCPD) is being used in several products with particular success regarding to weight reduction and surface finish improvement. Despite the enough good mechanical properties presented by this thermosetting polymer, it needs to be adequately reinforced in applications requiring extra structural stability. This work studies the improvement of mechanical properties that may be achieved in PDC...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||