Nuevas tendencias en la automatización con autómatas programables basados en la Norma IEC-61131-3

Dada las necesidades actuales en las automatizaciones industriales mediante los autómatas programables, que necesitan además del propio control, de comunicarse con multitud de equipos, tanto de control como de información, así como con programas informáticos de ayuda a los controles de producción, de mantenimiento y de la calidad de los productos, las formas clásicas de programación se han quedado obsoletas. A principio de los años 1990, se redactó una norma que ha propiciado unas nuevas tendencias de diseño de maniobras de automatización. Atendiendo a estas tendencias, y dada la experiencia del autor (que ha participado en dos proyecto europeos en este sentido) y las inquietudes de los alumnos de este tipo de tecnologías, se redacta un artículo que detalle escuetamente esta tendencias. Se ponen varios ejemplos prácticos para que el lector pueda adquirir unos conocimietos claros sobre la evolución de estas tecnologías.Pineda Sánchez, M. (2013). Nuevas tendencias en la automatización con autómatas programables basados en la Norma IEC-61131-3. http://hdl.handle.net/10251/3122

Técnicas en el control y regulación del alumbrado

En el ahorro energético, una de las variables más utilizadas es el control y ajuste de la iluminación. Además, a la hora de crear ambientes determinados desde el punto de vista de la decoración, este parámetro es también muy tenido en cuenta. Aunque la sensibilidad es sobradamente conocida es interesante saber (aunque de forma elemental) como se regula el alumbrado. En este trabajo se describe de forma básica los métodos más usuales en el control de la iluminación, se alecciona al lector en las técnicas empleadas hoy en día, y aunque no se entre en un análisis detallado por la extensión del artículo, al menos se dejan bastante claro la forma de actuar en estas tecnologías.Pineda Sánchez, M. (2013). Técnicas en el control y regulación del alumbrado. http://hdl.handle.net/10251/3122

Surface Protection of Quaternary Gold Alloys by Thiol Self-Assembled Monolayers

This work deals with a physical and chemical surface characterization of quaternary 18K, 14K, and 9K gold alloys and pure polycrystalline gold substrates. Surface microstructure and composition are evaluated by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and X-ray fluorescence spectroscopy. Corrosion resistance of 18K gold alloys is explored by potentiodynamic polarization showing the influence of the manufacturing process on materials fabricated as plates and wires. The research is also in the framework of one of the most common strategies on the modification of metallic surface properties, i.e., the building of self-assembled monolayers (SAM) from organic thiols. The metal affinity of the head group to produce the coating of the substrate by covalent binding is approached by using thiol compounds with different molecular structures and functional group chemistries exposed to an electrolyte solution. Therefore, a comparative study on the surface protection of a quaternary 18K gold alloy and pure gold substrates by SAMs of 6-mercaptopurine (6MP), 1-decanethiol (DT), and 11-mercaptoundecanoic acid (MUA) has been carried out. Surface modification and SAM organization are followed by cyclic voltammetry (CV), and the behavior of the double layer of the electrode–electrolyte interface is evaluated by electrochemical impedance spectroscopy (EIS). The study of these materials allows us to extract fundamental knowledge for its potential application in improving the bioactive properties of different jewelry pieces based on 18K gold alloys

Paraphrase Plagiarism Identifcation with Character-level Features

[EN] Several methods have been proposed for determining plagiarism between pairs of sentences, passages or even full documents. However, the majority of these methods fail to reliably detect paraphrase plagiarism due to the high complexity of the task, even for human beings. Paraphrase plagiarism identi cation consists in automatically recognizing document fragments that contain re-used text, which is intentionally hidden by means of some rewording practices such as semantic equivalences, discursive changes, and morphological or lexical substitutions. Our main hypothesis establishes that the original author's writing style ngerprint prevails in the plagiarized text even when paraphrases occur. Thus, in this paper we propose a novel text representation scheme that gathers both content and style characteristics of texts, represented by means of character-level features. As an additional contribution, we describe the methodology followed for the construction of an appropriate corpus for the task of paraphrase plagiarism identi cation, which represents a new valuable resource to the NLP community for future research work in this field.This work is the result of the collaboration in the framework of the CONACYT Thematic Networks program (RedTTL Language Technologies Network) and the WIQ-EI IRSES project (Grant No. 269180) within the FP7 Marie Curie action. The first author was supported by CONACYT (Scholarship 258345/224483). The second, third, and sixth authors were partially supported by CONACyT (Project Grants 258588 and 2410). The work of the fourth author was partially supported by the SomEMBED TIN2015-71147-C2-1-P MINECO research project and by the Generalitat Valenciana under the Grant ALMAMATER (PrometeoII/2014/030).Sánchez-Vega, F.; Villatoro-Tello, E.; Montes-Y-Gómez, M.; Rosso, P.; Stamatatos, E.; Villaseñor-Pineda, L. (2019). Paraphrase Plagiarism Identifcation with Character-level Features. Pattern Analysis and Applications. 22(2):669-681. https://doi.org/10.1007/s10044-017-0674-zS66968122

Induction machine model with space harmonics for the diagnosis of rotor eccentricity, based on the convolution theorem

[EN] Condition based maintenance (CBM) systems of induction machines (IMs) require fast and accurate models that can reproduce the fault related harmonics generated by different kinds of faults. Such models are needed to develop new diagnostic algorithms for detecting the faults at an early stage, to analyse the physical interactions between simultaneous faults of different types, or to train expert systems that can supervise and identify these faults in an autonomous way. To achieve these goals, these models must take into account the space harmonics of the air gap magnetomotive force (MMF) generated by the machine windings under fault conditions, due to the complex interactions between spatial and time harmonics in a faulty machine. One of the most common faults in induction machines is the rotor eccentricity, which can cause significant radial forces and, in extreme cases, produce destructive rotor-stator rub. However, the development of a fast, analytical model of the eccentric IM is a challenging task, due to the non-uniformity of the air gap. In this paper, a new method is proposed to obtain such a fast model. This method, which is theoretically justified, first enables a fast calculation of the self and mutual inductances of the stator and rotor phases for every rotor position, taking into account the non-uniform air-gap length and the actual position of all the stator and rotor conductors. Once these inductances are calculated, they are used in a coupled circuits analytical model of the IM, which in this way is able to calculate the time evolution of the electrical and mechanical quantities that characterize the machine functioning, under any type of eccentricity. Specifically, the model is able to reproduce accurately the characteristic eccentricity fault related harmonics in the spectrum of the stator current. The proposed approach is validated through two different methods. First, using a finite elements (FEM) model, in order to validate the correctness of the proposed method for calculating self and mutual inductances, taking into account the non-uniform air-gap. Finally, through an experimental test-bed using a commercial induction motor with a forced mixed eccentricity fault, in order to validate that the full model correctly reproduces the phase currents in such a way that their spectra accurately show the harmonics related with the eccentricity fault, which are the basis of many MCSA diagnostic approaches.This work was supported by the Spanish "Ministerio de Ciencia, Innovacion y Universidades (MCIU)", the "Agenda Estatal de Investigacion (AEI)" and the "Fondo Europeo de Desarrollo Regional (FEDER)" in the framework of the "Proyectos I + D + i - Retos Investigacion 2018", project reference RTI2018-102175-13400 (MCIU/AEI/FEDER, UE).Sapena-Bano, A.; Martinez-Roman, J.; Puche-Panadero, R.; Pineda Sánchez, M.; Pérez-Cruz, J.; Riera-Guasp, M. (2020). 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