j j Quintana

j j Quintana
Universidad de Las Palmas de Gran Canaria | ULPGC · Department of Electronic and Automatics Engineering

Doctor of Engineering

About

23
Publications
6,673
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247
Citations
Introduction
Supercapacitors, Human movements in industrial robots, Fractional calculus, active power filters.
Skills and Expertise

Publications

Publications (23)
Article
Supercapacitors are increasingly used as energy storage elements. Unlike batteries, their state of charge has a considerable influence on their voltage in normal operation, allowing them to work from zero to their maximum voltage. In this work, a theoretical and practical analysis is proposed of the energy efficiency of these devices according to t...
Conference Paper
Robotic arms commonly execute movements at a constant speed, but a sequence of short and rapid movements require the robotic arm to speed up and slow down continuously. This paper is aimed to assess if these movements can be approximated by the Sigma-Lognormal model. The parameters of the Sigma-Lognormal model have been calculated with two differen...
Conference Paper
Full-text available
The paper presents an approach to design rapid and fluid movements of an universal robot to perform robot writing mimicking both the human kinematics when signing and the trajectory. To perform the task, on-line human signing standards are created first. Robot writing task is performed using these standards after that and robot signatures are acqui...
Conference Paper
Full-text available
En la docencia en el ámbito de la robótica se trabajan varias competencias tales como la relación matemática de distintos sistemas de referencia, aprender a definir orientaciones de objetos y herramientas y programar robots. Para que los estudiantes adquieran estas competencias, es conveniente asentar los fundamentos teóricos mediante la realizació...
Article
The rise in energy consumption in modern societies has been unprecedented in recent decades. Non-dispatchable renewable energies include all the generation sources which have intermittent and uncertain characteristics such as wind and solar photovoltaic energies. The incorporation of high levels of penetration of variable energy sources generates n...
Article
Many features have been proposed in on-line signature verification. Generally, these features rely on the position of the on-line signature samples and their dynamic properties, as recorded by a tablet. This paper proposes a novel feature space to describe efficiently on-line signatures. Since producing a signature requires a skeletal arm system an...
Conference Paper
This paper proposes a novel set of function-based features for dynamic signature verification. They are inspired on the human stance and the variations in the angles of the arm joints when signing. Specifically, we propose to convert the trajectory and pen-tip altitude and azimuth from an on-line signature into the required sequence of an anthropom...
Conference Paper
Full-text available
The use of robotics arms provides students several advantages in the teaching and learning process, compared to methods based on simulation programs. Moreover, programming the robotic arm to imitate a human action previously carried out by the students, makes them to have a better personal satisfaction. Following up this idea, a lab session has bee...
Article
Full-text available
Electrochemical double-layer capacitors (EDLC), also known as supercapacitors or ultracapacitors, are devices in which diffusion phenomena play an important role. For this reason, their modeling using integer-order differential equations does not yield satisfactory results. The higher the temporal intervals are, the more problems and errors there w...
Article
This paper proposes a strategy control for energy storage systems with Electrochemical Capacitors. Electrochemical capacitors are electrochemical devices, which have a similar behavior that conventional capacitor, but with much more capacitance. In this work the electrochemical capacitor is used as an energy storage, with the advantage of its high...
Article
This paper provides a Fractional Equivalent Impedance for combinations of Electrochemical Double Layer Capacitors (EDLCs). The application of the fractional calculus for modeling EDLCs is a novel way to get simpler and more precise models. On using the impedance spectroscopy method, experimental results for different EDLC combinations have been obt...
Conference Paper
Full-text available
The application of the fractional calculus for modeling electrochemical double layer capacitors is a novel way to get simpler and precise models. This paper provides a summarized report of several models of Electrochemical Double Layer Capacitors (EDLC). From classical models based on simple structures composed by networks of passive elements (RLC)...
Conference Paper
The application of the fractional calculus for modeling electrochemical double layer capacitors is a novel way to get simpler and precise models. By means of the method of impedance spectroscopy, experimental results for different values of these have been obtained. In this paper several classical mathematical models are studied and a different met...
Article
Full-text available
In this work, we report the experimental values of the excess quantities and and the isobaric equilibrium data (VLE) at 101.32 kPa for the four mixtures of alkyl methanoates (methyl to butyl) and hexane. The results indicate that for these four mixtures (∂ /∂T)p > 0 and(∂ /∂T)p > 0. VLE data were found to be thermodynamically consistent with the Fr...
Conference Paper
Ultracapacitor are devices used to store energy in which diffusion phenomena are important. This paper obtains an identification of a double layer ultracapacitor using impedance spectroscopy. It has been observed from experimental data, that the ultracapacitor has a fractional behaviour. In order to get a good accuracy, conventional models use a lo...
Article
An analysis and simulations results of several linearization methods for the model of the buck converter by means of pulse width modulation are presented in this paper. The use of the pulse width modulation causes, in systems like the buck converter, nonlinear models. The operation of this system is based on the control of the output voltage of a p...
Article
Full-text available
Resumen En este artículo se exponen y desarrollan varios métodos para el control de un convertidor Buck de potencia en modo deslizamiento cuando la carga es variable. Se estudiará el método clásico de control en modo deslizamiento y un sistema de control basado en modulación por ancho de pulso (PWM) que admite bajas frecuencias de conmutación con u...
Article
Full-text available
The increase of nonlinear loads in networks involves rises of harmonic currents, resulting in distortions of the voltage that can affect other sensitive loads. The series voltage compensator are the devices used to reduce voltage deformation in networks of non negligible impedance. The control of the series compensator is an important problem to ob...

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Project
Towards the use of robots in signature verification