Joaquim Marques

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Digital audio watermarking is often discussed as a promising technology for protecting digital goods sold via internet, especially music downloads. Copyright information or customer identification can be embedded directly into audio files which are usually distributed using lossy compression. This leads to a number of specific requirements with respect to(More)
In this paper, we used the multiconfiguration Dirac-Fock method to generate theoretical X-ray spectra for Co-, Ni-, Cu-, Zn-, Ga-, Ge-, As-, Se-, Br-, Kr-, and Rb-like uranium ions. Using the distribution of these ions in a laser-produced plasma, for different plasma temperatures, we generate theoretical spectra which are compared to experimental data.(More)
The stratum corneum is the outermost layer of the skin. It constitutes a permeability barrier that keeps micro-organisms and toxic agents from entering the skin, while retaining water and electrolytes. In order to preserve its colour and elasticity, the skin needs lipids and water. Certain occlusive products in contact with the skin diminish its natural(More)
Open-source software (OSS) is one of the hottest trends in terms of the software development in the current days. It is highly discussed if this is the best model for software creation when compared to non-open-source alternatives, and most of the times this discussion is mostly driven by passion than by facts. The main rational behind this paper is to(More)
M. Guerra,1,* J. M. Sampaio,2 T. I. Madeira,2 F. Parente,1 P. Indelicato,3 J. P. Marques,2 J. P. Santos,1,† J. Hoszowska,4 J.-Cl. Dousse,4 L. Loperetti,4 F. Zeeshan,4 M. Müller,5 R. Unterumsberger,5 and B. Beckhoff5 1Laboratório de Instrumentação, Engenharia Biomédica e Fı́sica da Radiação (LIBPhys-UNL), Departamento de Fı́sica, Faculdade de Ciências e(More)
In this paper, we used the multiconfiguration Dirac-Fock method to compute with high precision the influence of the hyperfine interaction on the [Ar]3d4s4p P0 level lifetime in Zn-like ions for stable and some quasi-stable isotopes of nonzero nuclear spin between Z = 30 and Z = 92. The influence of this interaction on the [Ar]3d4s4p P1 − [Ar]3d 4s4p P0(More)