This note deals with the study of stress-sensitive relative permeability experimentally observed in low permeable sandstones. These sandstones are made up of quartz grains surrounded by permeable interfaces between grains and pores. A micromechanical model of relative permeability behaviour under loading highlights the role of the closure of interf...
Published in International Journal of Fatigue
In the present thesis, two new classes of phenomenological models in the framework of the continuum thermodynamics and gradient theory are proposed. The first one is standard gradient constitutive model used to deal with the mechanical problems at micro-scale, and the other concerns gradient fatigue criteria for the problems at small scale. Using t...
Published in Analog Integrated Circuits and Signal Processing
In this paper, a new active element called voltage differencing inverting buffered amplifier (VDIBA) is presented. Using single VDIBA and a capacitor, a new resistorless voltage-mode (VM) first-order all-pass filter (APF) is proposed, which provides both inverting and non-inverting outputs at the same configuration simultaneously. The pole frequenc...
A técnica da impedância eletromecânica (E/M) tem sido amplamente pesquisada para o desenvolvimento de sistemas de SHM (Structural Health Monitoring – monitoramento de integridade estrutural) em diversas aplicações. Embora existam muitos trabalhos que indiquem a eficiência e a viabilidade dessa técnica, alguns problemas práticos em aplicações reais ...
The electromechanical (E/M) impedance technique has been widely studied for the development of Structural Health Monitoring (SHM) systems in various applications. Although there are many studies indicating the effectiveness and feasibility of this technique, some practical issues in real applications yet should be investigated. The electrical imped...
The electromechanical (E/M) impedance technique has been widely studied for the development of Structural Health Monitoring (SHM) systems in various applications. Although there are many studies indicating the effectiveness and feasibility of this technique, some practical issues in real applications yet should be investigated. The electrical imped...
The electromechanical (E/M) impedance technique has been widely studied for the development of Structural Health Monitoring (SHM) systems in various applications. Although there are many studies indicating the effectiveness and feasibility of this technique, some practical issues in real applications yet should be investigated. The electrical imped...
Published in Journal of Electronic Testing
This paper describes a measurement principle for calculating component values from measurements conducted under less than optimal conditions, as is the case in the IEEE Std 1149.4 environment. Also presented are equations that take into account switch resistances on the signal paths, the output resistance of the signal generator, and the loading ef...
Heteroepitaxial SiGeC layers have attracted immenseattention as a material for high frequency devices duringrecent years. The unique properties of integrating carbon inSiGe are the additional freedom for strain and bandgapengineering as well as allowing more aggressive device designdue to the potential for increased thermal budget duringprocessing....
