Martins, Rodrigo, Daniel Costa, Hugo Águas, Fernanda Soares, António Marques, Isabel Ferreira, PMR Borges, Sergio Pereira, Leandro Raniero, and Elvira Fortunato. "
Insights on amorphous silicon nip and MIS 3D position sensitive detectors."
Materials science forum. Vol. 514. Trans Tech Publications, 2006. 13-17.
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Santos, V.a, Borges Ranito Pires Araújo Marques Tomás Fortunato Martins Nunes J. P. a C. "
Novel multilayer coatings on polyethylene for acetabular devices."
Materials Science Forum. 514-516 (2006): 868-871.
AbstractTotal hip replacement is a common practice in every day clinical work. Artificial hip implants consist of a femoral component and an acetabular component. Nowadays the acetabular component is composed of a polymeric cup and a metallic shell. This study focuses the development of an innovative acetabular component substituting the metallic shell by a multilayer coating on the acetabular cup. A titanium coating was deposited onto ultra-high molecular weight polyethylene (UHMWPE) samples by physical vapour deposition (PVD), having an in situ pre-treatment with argon ion bombardment in order to optimize the adhesive strength by surface modification, followed by the deposition of a thin film of hydroxyapatite (HA) using rf magnetron sputtering technique, at room temperature. Results obtained seem to indicate that these multilayer coatings can be a viable alternative to the metallic shell, leading to the substitution of a two part for a one part acetabular component.
Costa, A. M., M. C. Martins, J. P. Santos, P. Indelicato, and F. Parente. "
Relativistic calculation of Kβ hypersatellite energies and transition probabilities for selected atoms with 13<=Z<=80."
Journal of Physics B: Atomic and Molecular Physics. 39 (2006): 2355-2366.
AbstractEnergies and transition probabilities of Kβ hypersatellite lines are computed using the Dirac–Fock model for several values of Z throughout the periodic table. The influence of the Breit interaction on the energy shifts from the corresponding diagram lines and on the Kβh1/Kβh3 intensity ratio is evaluated. The widths of the double-K hole levels are calculated for Al and Sc. The results are compared to experiment and to other theoretical calculations.
Santos, J. P., G. C. Rodrigues, J. P. Marques, F. Parente, J. P. Desclaux, and P. Indelicato. "
Relativistic correlation correction to the binding energies of the ground configuration of beryllium-like, neon-like, magnesium-like and argon-like ions."
The European Physical Journal D. 37 (2006): 201-207.
AbstractTotal electronic correlation corrections to the binding energies of the isoelectronic series of beryllium, neon, magnesium and argon, are calculated in the framework of relativistic multiconfiguration Dirac-Fock method. Convergence of the correlation energies is studied as the active set of orbitals is increased. The Breit interaction is treated fully self-consistently. The final results can be used in the accurately determination of atomic masses from highly charged ions data obtained in Penning-trap experiments.
Lanca, M. C., E. R. Neagu, P. Silva, L. Gil, and J. Marat-Mendes. "
Study of electrical properties of natural cork and two derivative products."
Advanced Materials Forum Iii, Pts 1 and 2. Ed. P. M. Vilarinho. Vol. 514-516. Materials Science Forum, 514-516. 2006. 940-944.
AbstractElectrical properties of natural cork, commercial cork agglomerates (for floor and wall coverings) and a recently developed composite of cork/TetraPak (R) were studied. Measurements of isothermal charge and discharge currents were made for natural cork samples in different directions (axial, radial and tangential cuts). The isothermal current characteristics and the samples conductivity were investigated under different conditions (electric field, temperature and environmental conditions: in air at ambient relative humidity (RH), dry air and vacuum), also the samples could be or not conditioned (dried in vacuum or in a P2O5 atmosphere at room temperature). From these results the influence of water on the electrical properties of natural cork could be seen. In order to compare the three different cork materials a preliminary study was made. Isothermal charge and discharge currents and conductivity after 1h charging were measured and compared for different electric fields and temperature in air at ambient RH.