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Multi-scale modeling of the mechanical behavior of polymer-based materials
Araújo, Miguel Carvalho; Martins, J. P.; Mirkhalaf, Mohsen; Lanceros-Mendez, Senentxu; Pires, Francisco; Simões, RicardoPolymers have become the reference material for high reliability and performance applications. In this work, a multi-scale approach is proposed to investigate the mechanical properties of polymeric based material under strain. To achieve a better understanding of phenomena occurring at the smaller scales, a coupling of a Finite Element Method (FEM) and Molecular Dynamics (MD) modeling in an iterative procedure ...
Monte Carlo simulations of charge transport in polymeric composites with carbon...
Martins, J. P.; Marques, L.; Ramos, Marta M. D.Apresentação em poster ; Composite materials consisting of carbon nanotubes dispersed in a insulating polymer material have been receiving increased interest in many fields of application such as optics, electronics, medicine. Carbon nanotubes (CNT), because of their symmetry and unique electronic structure, can act as metallic or semiconducting material depending on the chiral vector orientation. Adding a sma...
Modelling charge transport in CNT-polymer films
Martins, J. P.; Marques, L.; Ramos, Marta M. D.Apresentação em poster ; Thin films of composites based on a blend of a polymer and carbon nanotubes (CNTs) have the potential to be used in electronic and optoelectronic devices. However, the charge transport through the CNT-polymer films depends on the concentration of CNTs and their arrangement within the polymer matrix. Here we use a mesoscopic model developed by us, based on a dynamical Monte-Carlo method...
Acid refining of synthesised alloys within the quaternary system Fe-Si-Ca-Al: e...
Queiroz, A.M.; Margarido, F.; Martins, J.P.A systematic study of synthesis of different chemical composition of alloys within the quaternary Fe-Si-Ca-Al system, versus acid leaching refining using HCl with or without FeCl3 has been undertaken. Such study has the aim of achieving an adequate structural composition of Fe-Si alloys, in order to obtain high purity and fine particle size silicon by acid leaching, at more reduced costs. The experimental resul...
Hadronic shower development in Iron-Scintillator Tile Calorimetry
Amaral, P.; Amorim, A.; Anderson, K.; Barreira, G.; Benetta, R.; Berglund, S.; Biscarat, C.; Blanchot, G.; Blucher, E.; Bogush, A.; Bohm, C.; Boldea, V.The lateral and longitudinal profiles of hadronic showers detected by a prototype of the ATLAS Iron-Scintillator Tile Hadron Calorimeter have been investigated. This calorimeter presents a unique longitudinal configuration of scintillator tiles. Using a fine-grained pion beam scan at 100 GeV, a detailed picture of transverse shower behaviour is obtained. The underlying radial energy densities for the four depth...
Evaluation of Fermi read-out of the Atlas Tilecal prototype
Ajaltouni, Z.; Albiol, F.; Alifanov, A.; Amaral, P.; Amelin, D.; Amorim, A.; Anderson, K.; Angelini, C.; Agnvall, S.; Antola, A.; Astesan, F.Prototypes of the FERMI system have been used to read out a prototype of the ATLAS hadron calorimeter in a beam test at the CERN SPS. The FERMI read-out system, using a compressor and a sampling ADC, is compared to a standard charge integrating read-out by measuring the energy resolution of the calorimeter separately with the two systems on the same events. ; http://www.sciencedirect.com/science/article/B6TJ...
Acid leaching of alloys within the quaternary system Fe-Si-Ca-Al
Margarido, F.; Figueiredo, M.O.; Queiroz, A.M.; Martins, J.P.Silicon with high purity and fine particle size can be produced by acid leaching of Fe-Si industrial alloys under the condition that they have adequate chemical composition and structural constitution. Such alloys contain phases that fall within the system Fe-Si-Ca-Al, where the quaternary phase Caalsifer, with aproximate formula (Fe0.8Al0.1 0.1) (Si0.8Ca0.2)2, is found along with several binary and ternary pha...
Estudo da corrosão do ferro em meio ácido clorídrico, na presença e na ausênci...
Queiroz, A.M.; Martins, J.P.A dissolução anódica do ferro foi estudada em meio de ácido clorídrico (força iónica constante de 4,0 M) usando voltametria linear (velocidade de varrimento = 2mV/s), a 25ºC, na presença e na ausência de ião férrico. A dissolução do ferro é acelerada quer pelos iões H+ quer pelos iões Cl, na gama de concentrações estudada. O ião férrico inibe a dissolução do ferro entre 0,025M e 0,1 M e acelera o processo entr...
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