9 documents found, page 1 of 1
An RPC-PET brain scanner demonstrator: first results
Fonte, Paulo; Lopes, Luís; Alves, Rui; Carolino, Nuno; Crespo, Paulo; Couceiro, Miguel; Cunha, Orlando; Dias, Nuno; Ferreira, Nuno C.; Fetal, SuseteWe present first results from a Positron Emission Tomography (PET) scanner demonstrator based on Resistive Plate Chambers and specialized for brain imaging. The device features a 30 cm wide cubic field-of-view and each detector comprises 40 gas gaps with 3D location of the interaction point of the photon. Besides other imagery, we show that the reconstructed image resolution, as evaluated by a hot-rod phantom, ...
The nature of the child and the invention of an interesting setting: the educat...
Silva, MagdaThis article proposes to discuss education of childhood as a technology of instinct. By technology I reveal its affiliation to the perspectives opened by Michel Foucault, regarding power in modern societies. By instinct, I mean a set of theoretical objects, identified by the same author, which by the mid-19th century were able to enter the rules of psychiatric discourse. As such, what is intended here is to an...
Poly(lactic acid)/graphite nanoplatelet nanocomposite filaments for ligament sc...
Silva, Magda; Gomes, Carina; Pinho, Isabel; Gonçalves, Hugo; Vale, A. Catarina; Covas, J. A.; Alves, N. M.; Paiva, Maria C.The anterior cruciate ligament (ACL) is one of the most prone to injury in the human body. Due to its insufficient vascularization and low regenerative capacity, surgery is often required when it is ruptured. Most of the current tissue engineering (TE) strategies are based on scaffolds produced with fibers due to the natural ligamentâ s fibrous structure. In the present work, composite filaments based on poly(L...
3D printing of graphene-based polymeric nanocomposites for biomedical applications
Silva, Magda; Pinho, Isabel S.; Covas, J. A.; Alves, N. M.; Paiva, Maria C.Additive manufacturing techniques established a new paradigm in the manufacture of composite materials providing a simple solution to build complex, custom designed shapes. In the biomedical field, 3D printing enabled the production of scaffolds with patient-specific requirements, controlling product architecture and microstructure, and have been proposed to regenerate a variety of tissues such as bone, cartila...
Graphene‐polymer nanocomposites for biomedical applications
Silva, Magda; Alves, N. M.; Paiva, M. C.Despite the significant efforts in the synthesis of new polymers, the mechanical properties of polymer matrices can be considered modest in most cases, which limits their application in demanding areas. The isolation of graphene and evaluation of its outstanding properties, such as high thermal conductivity, superior mechanical properties, and high electronic transport, have attracted academic and industrial in...
Identification and characterization of textile fibers by thermal analysis
Smith, Michael John; Gray, Fiona M.; Silva, MagdaTextile fibers are ubiquitous in the sense that they are present in the fabric of clothing, furniture, floor and wall covering. A remarkable variety of textile fibers with different chemical compositions are produced for many different commercial applications. As fibers are readily transferred they are frequently recovered from crime scenes as trace evidence and may provide useful forensic information for ident...
Musschia isambertoi M. Seq., R. Jardim, M. Silva & L. Carvalho (Campanulaceae),...
Sequeira, Miguel Menezes de; Jardim, Roberto; Silva, Magda; Carvalho, LígiaMenezes de Sequeira, M., Jardim, R., Silva, M. & Carvalho, L. 2007. Musschia isambertoi M. Seq., R. Jardim, M. Silva & L. Carvalho (Campanulaceae), a new species from the Madeira Archipelago (Portugal). Anales Jard. Bot. Madrid 64(2): 135-146. A new species of Musschia Dumort. (Campanulaceae), endemic from Madeira Archipelago (Portugal), is described as Musschia isambertoi M. Seq., R. Jardim, M. Silva & L. Carv...
Long-range dependence of internet traffic aggregates
Lima, Solange; Silva, Magda; Carvalho, Paulo; Santos, Alexandre; Freitas, VascoThis paper studies and discusses the presence of LRD in network traffic after classifying flows into traffic aggregates. Following DiffServ architecture principles, generic QoS application requirements and the transport protocol in use, a classification criterion of Internet traffic is established. Using fractal theory, the resulting traffic classes are analysed. The Hurst parameter is estimated and used as a m...
Caracterizaçao de trafego diferenciado na Universidade do Minho
Silva, Magda; Lima, Solange; Carvalho, Paulo; Santos, Alexandre; Freitas, VascoNeste artigo estabelece-se um critério para a classificaçãoo de tráfego de rede, baseado no modelo DiffServ e nos requisitos de QoS das aplicações, e estudam-se as pro- priedades estatísticas das classes resultantes à luz da teoria dos fractais Para tal, são utilizadas amostras de tráfego real, recolhidas num router de backbone da Universidade do Minho em períodos de diferente utilização da rede. Para as várias...