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We present a simple analytical model for the dispersion of a pulse radiated by a self-complementary logarithmic-periodic antenna. The model predicts the variation in the spectral phase, and explains the underlying mechanism behind it. The variation in the spectral phase predicted by the model is compared with the spectral phase measured with a Terahertz (THz) Time Domain System (TDS) System that uses...
Similarity measures, as studied in the context of fuzzy set theory, have been proven applicable to many different fields. Surely, their primary role is to model the perceived (dis-) similarity between two fuzzy sets or, equivalently, the linguistic terms they represent. However, the richness of the dedicated study makes the similarity measures portable to other contexts in which quantitative comparison...
E-learning students tend to get jaded and easily dropout from online courses. Enhancing the learners' experience and reducing dropout rates in these e-learning based scenarios is the main purpose of this study. This paper presents the results obtained so far and preliminary conclusions. In a first stage, the objective was to study the background and state of the art of these educational scenarios...
Technological solutions for the transfer to large area microstrip radiation silicon sensors are presented for the upgrade of the ATLAS detector. A new Automatic Layout Generation Tool has been developed to easily adapt the design of the sensors, investigating also the fabrication processes involved in 6-inch wafer technology. Inter-strip and radiation hardness characterization of prototype sensors...
Resistive sensors based on electrospun tin oxide nanofibers have been deposited onto micromachined silicon substrates to detect low nitrogen dioxide (NO2) concentrations in air. Solution precursors for the electrospinning were based on polyvinyl alcohol (PVA) and tin chloride dihydrate (SnCl2·2H2O). The sensors have been doped with gold and palladium in order to improve their sensing characteristics...
Research efforts carried out on Intelligent Transportation Systems (ITS) for improving safety and efficiency of road transportation have been focused on cars, where vehicular communications have demonstrated to enhance the driver awareness with active services that improve fatality statistics. Although common vehicles accidents have been reduced in the last years, those involving vulnerable road users...
In this work, a serious game is presented to sensitize young people to stigma in mental health. This a video game, developed by a multidisciplinary team (computer scientists, psychologists, psychiatrists and educators), features characters that have different mental disorders. It provides different information about what mental illness is while the player interacts with the characters in different...
Computational devices with significant computing power are pervasive yet often under-exploited since they are frequently idle or performing non-demanding tasks. Exploiting this power can be a cost-effective solution for solving complex computational tasks. Device-wise, this computational power can some times comprise a stable, long-lasting availability windows but it will more frequently take the...
Differentiation of interval-valued functions is an intricate problem, since it cannot be defined as a direct generalization of differentiation of scalar ones. Literature on interval arithmetic contains proposals and definitions for differentiation, but their semantic is unclear for the cases in which intervals represent the ambiguity due to hesitancy or lack of knowledge. In this work we analyze the...
In this work, we analyze the influence of the nanocrystallization process on the luminescence properties of Er3+ ions in transparent oxyfluoride tellurite glass-ceramics obtained by heat treatment of the precursor Er-doped glass. The comparison between the fluorescence properties of Er-doped glass and glass-ceramics suggests that a fraction of Er3+ ions are forming nanocrystals while the rest remain...
We report random laser action, for the first time to our knowledge, in crystalline powders of LiLa1−xNdxP4O12 (x = 0.5 and 1) by using a pulsed Ti-sapphire pumping. The effect of grain size on slope efficiency and threshold energy is investigated. The absolute slope efficiencies are similar for all samples studied whereas the lowest threshold pump energy corresponds to the stoichiometric sample with...
Educational resources are essential components in education and they have improved and evolved through information technologies and everyday use, such as mobile devices. So much time devoted to this device turns it into a very attractive means to suggest applications which serve as a reinforcement to the theoretical contents of the subjects. In this paper, it is shown the implementation of an educational...
A hydrokinetic smart grid (KSG) concept powered by modules of hydrokinetic microturbines arranged in rows is proposed in this work. A complete description of each module: mechanical design, hydropower characteristics, power electronics and control strategies have been included. A complete dynamic simulation of an example of a KSG has been performed. It considers microturbine modules, power loads,...
The top-down approach to system design allows obtaining separate specifications for each subsystem. In the case of vision systems, this means propagating system-level specifications down to particular specifications for e. g. the image sensor, the image processor, etc. This permits to adopt different design strategies for each one of them, as long as they meet their own specifications. This approach...
We present a full-wave numerical tool for the simulation of plasma antennas. The tool makes use of a hybrid formulation that allows treating the plasma with a Finite Element discretization, and the metallic parts with the Method of Moments. The finite element discretization is solved using a state-of-the-art sparse solver (MUMPS) in order to reduce the computational time at a minimum. The accuracy...
Induction machines are connected to a wide variety of mechanical elements. A failure in drive or load will affect the performance of the whole system. Therefore, it will cause malfunction of the “healthy element” and it may lead to it she destruction with time. Nowadays it is possible to monitor the state of drive and load by analysing the electrical machine signatures applying MCSA such as FFT and...
We report the numerical analysis of a plasma antenna array comprised of cylindrical plasma discharges and a conventional half-wavelength metallic dipole. In particular, the 3D radiation pattern, gain and impedance of the antenna are determined and compared for different values of the plasma density. To reduce the computational load by exploiting the translational symmetry of the structure, we have...
The operation of multi-domain and multi-vendor EONs can be achieved by interoperable Sliceable Bandwidth Variable Transponders, a GMPLS / BGP-LS-based control plane and a planning tool. This paper reports the first full demonstration and validation this end-to-end architecture.
We present the numerical analysis of a reconfigurable plasma antenna array (PAA) comprised of a metallic half-wavelength dipole and a variable number of cylindrical plasma tubes that are arranged in a planar rectangular lattice. Our simulations, carried out with the linear embedding via Green's operators (LEGO) method, indicate that beam-forming and beam-steering can be realized and controlled by...
Object-oriented modeling is spreading in current simulation environments through the use of the individual components of the model and its interconnections to define the underlying dynamic equations. In this paper we describe the use of the SIMSCAPE simulation environment in the object-oriented modeling of the short-term arterial pressure control system when is applied to patients undergoing different...
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