Browsing by Issue Date, starting with "2017-09-26"
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- Managing Knowledge – The Importance of Databases in the Scientific ProductionPublication . Figueiredo, M.S.N.; Pereira, A.M.The process of knowledge management results from the need to survive in a world dominated by innovation, and the need for its management is based on the creation of value. Knowledge is a process that occurs in three steps: creation, exploitation and maintenance. This steps lead to the creation of new knowledge, that in turn are feed by relations created among disciplines. This knowledge must be shared, and organizations shall find a way to do it in order to survive. So, databases might be a solution to promote creation of value and scientific production. In this research one has done a review of state of the art, being this one an evaluation method that allows deepening about the subject, answering for the purpose of this paper. The question that is to answer is the following: what is the importance of databases in the scientific production? Collecting papers about subjects as knowledge management, databases and other, was the point of departure to get to a conclusion about the posed question. In this study one can conclude that the objective is to create an automatic database that manage knowledge properly so that users just have to use it in a simple and quick way. Related to this, databases exist, but still present several limitations as for example involving manual work such as experts’ validation. Although the impact of databases is not studied by literature, transdisciplinarity suggests that it would be favorable to scientific quality production: if we consider network as an enabler of scientific production, and if we consider databases a form of networking, it leads us to think that it would contribute to scientific quality production too.
- Application of a Hybrid Additive Manufacturing Methodology to Produce a Metal/Polymer Customized Dental ImplantPublication . Silva, M.; Felismina, R.; Mateus, A.; Parreira, P.; Malça, C.In this paper an integrated methodology for implants personalized manufacturing is presented. This methodology materializes the hybrid material implants manufacturing through the integration of two or more advanced Additive Manufacturing (AM) technologies. Furthermore, high strength biomechanical implants with optimized geometry and mass can be manufactured by biomimetic concepts application. The combination of polymers and ceramics or polymers and metal materials (or metal alloys) allows a significant leap in the development and production of a great diversity of components and applications. The combination of advanced additive manufacturing processes, e.g. the Selective Laser Melting (SLM) or Selective Laser Sintering (SLS) and the StereoLithography (SL), make possible the production of parts with almost unlimited geometric freedom and custom multimaterial. The manufacturing flexibility and the processing capacity of the different combinations of materials - metal/polymer - obtained from hybrid additive manufacturing systems - SLM/SL - are demonstrated here by the manufacture of a dental bridge implant.
- Cork Plastic Composite Optimization for 3D Printing ApplicationsPublication . Brites, F.; Malça, C.; Gaspar, F.; Horta, J. F.; Franco, M. C.; Biscaia, S.; Mateus, A.Among natural fillers, cork has been acknowledged as a suitable alternative of other cellular materials that are widely employed in engineering applications due to their low conductivity to heat, noise and vibration, high abrasion resistance and flexibility, high compressibility ratio, among other characteristics [1]. The eco-friendly features of natural fillers based composites make them a very promising and sustainable solution to large markets mainly if additive manufacturing technologies, such as 3D printing, are used [2]. Through 3D printers, engineers, designers and architects can create design and decor products with a free complexity of geometry. In this research work, plastic matrices of HDPE – obtained from conventional suppliers – were reinforced with different ratios of cork waste and natural cork powders – obtained from cork transformation industries – to find the optimum mixture for 3D printing. The effects of cork powders content in the plastic on the morphological, physical and mechanical properties of the composites were investigated through the density, optical microscopy, wettability, thermal analysis and tensile testing. Cork-based composites were processed by an extrusion system, and the mixture of polymer, adhesive and fillers is discussed. The results show that the addition of pure cork and cork waste can be processed with polymers such as HDPE, having adequate physical and mechanical properties.