In multilevel systems it is important to avoid unwanted indirect information flow from higher levels to lower levels, namely the so called covert channels. Initial studies of information flow analysis were performed by abstracting away from time and probability. It is already known that systems that are considered to be secure may turn out to be insecure when time or probability are considered....

Energy power from renewable sources, especially wind turbine generators, are being considered as an important generation alternative in the electrical power systems around the world due to their non contaminant nature and low environmental effects. In particular, the power supplied by wind generators is widely random following the random nature of weather conditions; therefore a probabilistic a...

We have developed a near-field microwave microscope to locally excite a superconducting film and measure secondand third-order harmonic responses at microwave frequencies. We study the local nonlinear response of a YBa2Cu3O72d thin film grown on a bicrystal SrTiO3 substrate. The location of the bicrystal grain boundary is clearly identified by the microscope through higher harmonic response, an...

Background Contrast-enhanced ultrasonography by means of Levovist, a galactose-based ultrasound contrast agent that is infused intravenously has allowed the observation of the vasculature of the abdominal organs. Particularly, contrast harmonic imaging, which is the specific imaging mode for Levovist, can depict signals from microbubbles in very slow flow without Doppler-related artifacts and i...

the harmonic in distribution systems becomes an important problem due to an increase in nonlinear loads. this paper presents a new approach based on a graph algorithm for optimum placement of passive harmonic filters in a multi-bus system, which suffers from harmonic current sources. the objective of this paper is to minimize the network loss, the cost of the filter and the total harmonic disto...