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http://hdl.handle.net/2117/7019
Wed, 26 Nov 2014 09:16:59 GMT
20141126T09:16:59Z
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no

PEM fuel cell fault diagnosis via a hybrid methodology based on fuzzy and pattern recognition techniques
http://hdl.handle.net/2117/24153
Title: PEM fuel cell fault diagnosis via a hybrid methodology based on fuzzy and pattern recognition techniques
Authors: Escobet Canal, Antoni; Nebot Castells, M. Àngela; Múgica Álvarez, Francisco
Abstract: In this work, a fault diagnosis methodology termed VisualBlockFuzzy Inductive Reasoning, i.e. VisualBlockFIR, based on fuzzy and pattern recognition approaches is presented and applied to PEM fuel cell power systems. The innovation of this methodology is based on the hybridization of an artificial intelligence methodology that combines fuzzy approaches with well known pattern recognition techniques. To illustrate the potentiality of VisualBlockFIR, a nonlinear fuel cell simulator that has been proposed in the literature is employed. This simulator includes a set of five fault scenarios with some of the most frequent faults in fuel cell systems. The fault detection and identification results obtained for these scenarios are presented in this paper. It is remarkable that the proposed methodology compares favorably to the modelbased methodology based on computing residuals while detecting and identifying all the proposed faults much more rapidly. Moreover, the robustness of the hybrid fault diagnosis methodology is also studied, showing good behavior even with a level of noise of 20 dB.
Description: © IFAC 2014. This work is posted here by permission of IFAC for your personal use. Not for distribution. The original version was published in ifacpapersonline.net
Wed, 24 Dec 2014 14:59:34 GMT
http://hdl.handle.net/2117/24153
20141224T14:59:34Z
Escobet Canal, Antoni; Nebot Castells, M. Àngela; Múgica Álvarez, Francisco
no
Fault diagnosis system, Fuel cell system, Fuzzy inductive reasoning, VisualBlockFIR
In this work, a fault diagnosis methodology termed VisualBlockFuzzy Inductive Reasoning, i.e. VisualBlockFIR, based on fuzzy and pattern recognition approaches is presented and applied to PEM fuel cell power systems. The innovation of this methodology is based on the hybridization of an artificial intelligence methodology that combines fuzzy approaches with well known pattern recognition techniques. To illustrate the potentiality of VisualBlockFIR, a nonlinear fuel cell simulator that has been proposed in the literature is employed. This simulator includes a set of five fault scenarios with some of the most frequent faults in fuel cell systems. The fault detection and identification results obtained for these scenarios are presented in this paper. It is remarkable that the proposed methodology compares favorably to the modelbased methodology based on computing residuals while detecting and identifying all the proposed faults much more rapidly. Moreover, the robustness of the hybrid fault diagnosis methodology is also studied, showing good behavior even with a level of noise of 20 dB.

Fault detection and isolation in critical infrastructure systems
http://hdl.handle.net/2117/24710
Title: Fault detection and isolation in critical infrastructure systems
Authors: Puig Cayuela, Vicenç; Escobet Canal, Teresa; Sarrate Estruch, Ramon; Quevedo Casín, Joseba Jokin
Abstract: Critical infrastructure systems (CIS) are complex largescale systems
which in turn require highly sophisticated supervisory control systems to ensure that high performance can be achieved and maintained under adverse conditions. The global CIS RealTime Control (RTC) need of operating in adverse conditions involves, with a high probability, sensor and actuator malfunctions (faults). This problem calls for the use of an online Fault Detection and Isolation (FDI) system able to detect such faults. This paper proposes a FDI mechanism that extends the classical Boolean fault signature matrix concept taking into account several fault signal properties to isolate faults in CIS. To exemplify the proposed FDI scheme in CIS, the Barcelona drinking water network is used as a case study.
Thu, 13 Nov 2014 10:00:49 GMT
http://hdl.handle.net/2117/24710
20141113T10:00:49Z
Puig Cayuela, Vicenç; Escobet Canal, Teresa; Sarrate Estruch, Ramon; Quevedo Casín, Joseba Jokin
no
Critical infrastructure systems (CIS) are complex largescale systems
which in turn require highly sophisticated supervisory control systems to ensure that high performance can be achieved and maintained under adverse conditions. The global CIS RealTime Control (RTC) need of operating in adverse conditions involves, with a high probability, sensor and actuator malfunctions (faults). This problem calls for the use of an online Fault Detection and Isolation (FDI) system able to detect such faults. This paper proposes a FDI mechanism that extends the classical Boolean fault signature matrix concept taking into account several fault signal properties to isolate faults in CIS. To exemplify the proposed FDI scheme in CIS, the Barcelona drinking water network is used as a case study.

Decomposition of geometric constraint graphs based on computing fundamental circuits. Correctness and complexity
http://hdl.handle.net/2117/24627
Title: Decomposition of geometric constraint graphs based on computing fundamental circuits. Correctness and complexity
Authors: Joan Arinyo, Robert; Tarres Puertas, Marta Isabel; Vila Marta, Sebastià
Abstract: In geometric constraint solving, Decomposition Recombination solvers (DRsolvers) refer to a general solving approach where the problem is divided into a set of subproblems, each subproblem is recursively divided until reaching basic problems which are solved by a dedicated equational solver. Then the solution to the starting problem is computed by merging the solutions to the subproblems.; Triangle or treedecomposition is one of the most widely used approaches in the decomposition step in DRsolvers. It may be seen as decomposing a graph into three subgraphs such that subgraphs pairwise share one graph vertex. Shared vertices are called hinges. Then a merging step places the geometry in each subproblem with respect to the other two.; In this work we report on a new algorithm to decompose biconnected geometric constraint graphs by searching for hinges in fundamental circuits of a specific planar embedding of the constraint graph. We prove that the algorithm is correct. (C) 2014 Elsevier Ltd. All rights reserved.
Mon, 10 Nov 2014 10:06:18 GMT
http://hdl.handle.net/2117/24627
20141110T10:06:18Z
Joan Arinyo, Robert; Tarres Puertas, Marta Isabel; Vila Marta, Sebastià
no
Geometric constraint solving, Graph decomposition, Fundamental circuits, Bridges, Planar embeddings, CONSTRUCTIVE APPROACH, SYSTEMS, SOLVER, ALGORITHM, DESIGN, PLANS
In geometric constraint solving, Decomposition Recombination solvers (DRsolvers) refer to a general solving approach where the problem is divided into a set of subproblems, each subproblem is recursively divided until reaching basic problems which are solved by a dedicated equational solver. Then the solution to the starting problem is computed by merging the solutions to the subproblems.; Triangle or treedecomposition is one of the most widely used approaches in the decomposition step in DRsolvers. It may be seen as decomposing a graph into three subgraphs such that subgraphs pairwise share one graph vertex. Shared vertices are called hinges. Then a merging step places the geometry in each subproblem with respect to the other two.; In this work we report on a new algorithm to decompose biconnected geometric constraint graphs by searching for hinges in fundamental circuits of a specific planar embedding of the constraint graph. We prove that the algorithm is correct. (C) 2014 Elsevier Ltd. All rights reserved.

Forward backward asymmetries of lepton pairs in events with a large transverse momentum jet at hadron colliders
http://hdl.handle.net/2117/24587
Title: Forward backward asymmetries of lepton pairs in events with a large transverse momentum jet at hadron colliders
Authors: Águila López, Francisco del; Ametller Congost, Lluís; Talavera Sánchez, Pedro
Abstract: We discuss forwardbackward charge asymmetries for leptonpair production in association with a largetransversemomentum jet at hadron colliders. The lepton charge asymmetry relative to the jet direction AjFB gives a new determination of the effective weak mixing angle sin2lept
eff M2 Z with a statistical precision after cuts of 10 3 (8 10 3) at LHC (Tevatron). This is to be compared with the current uncertainty at LEP and SLD from the asymmetries alone, 2 10 4. The identification of b jets
also allows for the measurement of the bottomquark–Z asymmetry AbFB at hadron colliders, the resulting statistical precision for sin2lept eff M2
Z being 9 10 4 (2 10 2 at Tevatron), also lower than the reported precision at e+ e colliders, 3 10 4.
Thu, 06 Nov 2014 19:13:03 GMT
http://hdl.handle.net/2117/24587
20141106T19:13:03Z
Águila López, Francisco del; Ametller Congost, Lluís; Talavera Sánchez, Pedro
no
We discuss forwardbackward charge asymmetries for leptonpair production in association with a largetransversemomentum jet at hadron colliders. The lepton charge asymmetry relative to the jet direction AjFB gives a new determination of the effective weak mixing angle sin2lept
eff M2 Z with a statistical precision after cuts of 10 3 (8 10 3) at LHC (Tevatron). This is to be compared with the current uncertainty at LEP and SLD from the asymmetries alone, 2 10 4. The identification of b jets
also allows for the measurement of the bottomquark–Z asymmetry AbFB at hadron colliders, the resulting statistical precision for sin2lept eff M2
Z being 9 10 4 (2 10 2 at Tevatron), also lower than the reported precision at e+ e colliders, 3 10 4.

A low inband radiation superregenerative oscillator
http://hdl.handle.net/2117/24580
Title: A low inband radiation superregenerative oscillator
Authors: Palà Schönwälder, Pere; Bonet Dalmau, Jordi; Moncunill Geniz, Francesc Xavier; Águila López, Francisco del; Giralt Mas, Ma. Rosa
Abstract: This brief describes a superregenerative (SR) voltagecontrolled oscillator as a building block for SR receivers where most of the oscillator spectrum components are outside the reception frequency band. This allows overcoming one of the main drawbacks of SR receivers, i.e., the potential interference to nearby receivers operating at the same frequency due to oscillator reradiation. We perform a qualitative analysis of the solution of the circuit equations, describe the most relevant parameters for design, and provide some numerical simulation results. Experimental results on a proofofconcept implementation validating the described principle and a discussion of the observed behavior are provided.
Thu, 06 Nov 2014 18:06:44 GMT
http://hdl.handle.net/2117/24580
20141106T18:06:44Z
Palà Schönwälder, Pere; Bonet Dalmau, Jordi; Moncunill Geniz, Francesc Xavier; Águila López, Francisco del; Giralt Mas, Ma. Rosa
no
Low power, Oscillator reradiation, Radio receiver, Superregenerative (SR) receiver
This brief describes a superregenerative (SR) voltagecontrolled oscillator as a building block for SR receivers where most of the oscillator spectrum components are outside the reception frequency band. This allows overcoming one of the main drawbacks of SR receivers, i.e., the potential interference to nearby receivers operating at the same frequency due to oscillator reradiation. We perform a qualitative analysis of the solution of the circuit equations, describe the most relevant parameters for design, and provide some numerical simulation results. Experimental results on a proofofconcept implementation validating the described principle and a discussion of the observed behavior are provided.

Fault diagnosis of advanced wind turbine benchmark using intervalbased ARRs and observers
http://hdl.handle.net/2117/24121
Title: Fault diagnosis of advanced wind turbine benchmark using intervalbased ARRs and observers
Authors: Sánchez Sardi, Héctor Eloy; Escobet Canal, Teresa; Puig Cayuela, Vicenç
Abstract: In this paper, the problem of the fault diagnosis of an advanced wind turbine benchmark will be addressed using analytical redundant relations (ARRs) and observers that considers uncertainty in a bounded context, using the socalled interval approach. The fault detection test is based on checking the consistency between the measurements and the model by nding if the formers are
inside the interval bounds provided by the interval model. In case a fault is detected, using the theoretical fault signature matrix against the full set of residuals available online, the fault is isolated. Two fault isolation schemes are compared. One based in the classical column matching and the other one using the rowreasoning inspired in the DX fault diagnosis approach. Finally, the proposed approach will be tested using the advanced wind turbine benchmark proposed in the literature.
Fri, 19 Sep 2014 12:43:30 GMT
http://hdl.handle.net/2117/24121
20140919T12:43:30Z
Sánchez Sardi, Héctor Eloy; Escobet Canal, Teresa; Puig Cayuela, Vicenç
no
In this paper, the problem of the fault diagnosis of an advanced wind turbine benchmark will be addressed using analytical redundant relations (ARRs) and observers that considers uncertainty in a bounded context, using the socalled interval approach. The fault detection test is based on checking the consistency between the measurements and the model by nding if the formers are
inside the interval bounds provided by the interval model. In case a fault is detected, using the theoretical fault signature matrix against the full set of residuals available online, the fault is isolated. Two fault isolation schemes are compared. One based in the classical column matching and the other one using the rowreasoning inspired in the DX fault diagnosis approach. Finally, the proposed approach will be tested using the advanced wind turbine benchmark proposed in the literature.

Phase contrast and operation regimes in multifrequency atomic force microscopy
http://hdl.handle.net/2117/23181
Title: Phase contrast and operation regimes in multifrequency atomic force microscopy
Authors: Santos Hernández, Sergio
Abstract: In amplitude modulation atomic force microscopy the attractive and the repulsive force regimes induce phase shifts above and below 90°, respectively. In the more recent multifrequency approach, however, multiple operation regimes have been reported and the theory should be revisited. Here, a theory of phase contrast in multifrequency atomic force microscopy is developed and discussed in terms of energy transfer between modes, energy dissipation and the kinetic energy and energy transfer associated with externally driven harmonics. The single frequency virial that controls the phase shift might undergo transitions in sign while the average force (modal virial) remains positive (negative). © 2014 AIP Publishing LLC.
Fri, 06 Jun 2014 15:03:25 GMT
http://hdl.handle.net/2117/23181
20140606T15:03:25Z
Santos Hernández, Sergio
no
Soft matter, Mode, Energy, Liquid, AFM
In amplitude modulation atomic force microscopy the attractive and the repulsive force regimes induce phase shifts above and below 90°, respectively. In the more recent multifrequency approach, however, multiple operation regimes have been reported and the theory should be revisited. Here, a theory of phase contrast in multifrequency atomic force microscopy is developed and discussed in terms of energy transfer between modes, energy dissipation and the kinetic energy and energy transfer associated with externally driven harmonics. The single frequency virial that controls the phase shift might undergo transitions in sign while the average force (modal virial) remains positive (negative). © 2014 AIP Publishing LLC.

A set simulation approach to the computation of invariant sets for nonlinear systems
http://hdl.handle.net/2117/22896
Title: A set simulation approach to the computation of invariant sets for nonlinear systems
Authors: Cugueró Escofet, Josep; Saludes Closa, Jordi; Escobet Canal, Teresa
Abstract: Given a nonlinear discretetime system, previous works exist that compute invariant sets as finite unions of boxes. Set inversion algorithms based on interval arithmetic are used to obtain inner approximations of the one step set starting in an invariant target set. In this paper a complementary approach based on set simulation is proposed. An invariant set can be obtained if a set trajectory that initiates in a given set, reaches this set again in a given number of steps at most. The first advantage of the proposed method is that there is no need to know an initial invariant set. The second one is that for a given system, a high convergence rate of the trajectories tends to reduce the computational effort of the method. The main disadvantage is that the algorithm does not guarantee that an invariant set is obtained. It just guarantees a response in finite time.
Wed, 07 May 2014 16:11:31 GMT
http://hdl.handle.net/2117/22896
20140507T16:11:31Z
Cugueró Escofet, Josep; Saludes Closa, Jordi; Escobet Canal, Teresa
no
Computational methods, Computer aided control design
Given a nonlinear discretetime system, previous works exist that compute invariant sets as finite unions of boxes. Set inversion algorithms based on interval arithmetic are used to obtain inner approximations of the one step set starting in an invariant target set. In this paper a complementary approach based on set simulation is proposed. An invariant set can be obtained if a set trajectory that initiates in a given set, reaches this set again in a given number of steps at most. The first advantage of the proposed method is that there is no need to know an initial invariant set. The second one is that for a given system, a high convergence rate of the trajectories tends to reduce the computational effort of the method. The main disadvantage is that the algorithm does not guarantee that an invariant set is obtained. It just guarantees a response in finite time.

Unlocking higher harmonics in atomic force microscopy with gentle interactions
http://hdl.handle.net/2117/22859
Title: Unlocking higher harmonics in atomic force microscopy with gentle interactions
Authors: Santos Hernández, Sergio; Barcons Xixons, Víctor; Font Teixidó, Josep; Verdaguer Prats, Albert
Abstract: In dynamic atomic force microscopy, nanoscale properties are encoded in the higher harmonics. Nevertheless, when gentle interactions and minimal invasiveness are required, these harmonics are typically undetectable. Here, we propose to externally drive an arbitrary number of exact higher harmonics above the noise level. In this way, multiple contrast channels that are sensitive to compositional variations are made accessible. Numerical integration of the equation of motion shows that the external introduction of exact harmonic frequencies does not compromise the fundamental frequency. Thermal fluctuations are also considered within the detection bandwidth of interest and discussed in terms of higherharmonic phase contrast in the presence and absence of an external excitation of higher harmonics. Higher harmonic phase shifts further provide the means to directly decouple the true topography from that induced by compositional heterogeneity.
Tue, 06 May 2014 14:12:40 GMT
http://hdl.handle.net/2117/22859
20140506T14:12:40Z
Santos Hernández, Sergio; Barcons Xixons, Víctor; Font Teixidó, Josep; Verdaguer Prats, Albert
no
Atomic force microscopy, Chemistry, Composition, Heterogeneity, Higher harmonics, Phase, Molecular resolution, Sosft matter, Mode, AFM, Liquid, Cells, Live
In dynamic atomic force microscopy, nanoscale properties are encoded in the higher harmonics. Nevertheless, when gentle interactions and minimal invasiveness are required, these harmonics are typically undetectable. Here, we propose to externally drive an arbitrary number of exact higher harmonics above the noise level. In this way, multiple contrast channels that are sensitive to compositional variations are made accessible. Numerical integration of the equation of motion shows that the external introduction of exact harmonic frequencies does not compromise the fundamental frequency. Thermal fluctuations are also considered within the detection bandwidth of interest and discussed in terms of higherharmonic phase contrast in the presence and absence of an external excitation of higher harmonics. Higher harmonic phase shifts further provide the means to directly decouple the true topography from that induced by compositional heterogeneity.

A superregenerative QPSK receiver
http://hdl.handle.net/2117/22014
Title: A superregenerative QPSK receiver
Authors: Palà Schönwälder, Pere; Bonet Dalmau, Jordi; Moncunill Geniz, Francesc Xavier; Águila López, Francisco del; Giralt Mas, Ma. Rosa
Abstract: In this paper we present a description and experimental verification of a superregenerative receiver (SR) for QPSK signals. Exploiting the fact that a conventional SR generates pulses which preserve the input phase information, we take $N$ 1bit samples of each generated pulse. A suitable choice of the sampling frequency gives as a result a bit vector containing a subsampled version of each PSK pulse. Extremely simple digital processing of the vectors from two consecutive pulses allows symbol decision, together with information on signal quality and frequency displacements. Although presented for the QPSK case, the principle may be applied to the MPSK case with obvious changes. Experimental results on a 20 kbit/s proofof concept receiver in the 27 MHz band, achieving a sensitivity of103 dBm, with an FPGAbased implementation of the digital part, validate the proposed approach.
Wed, 12 Mar 2014 16:09:55 GMT
http://hdl.handle.net/2117/22014
20140312T16:09:55Z
Palà Schönwälder, Pere; Bonet Dalmau, Jordi; Moncunill Geniz, Francesc Xavier; Águila López, Francisco del; Giralt Mas, Ma. Rosa
no
Lowpower communication receivers, QPSK demodulation, RF receivers, Superregenerative receiver
In this paper we present a description and experimental verification of a superregenerative receiver (SR) for QPSK signals. Exploiting the fact that a conventional SR generates pulses which preserve the input phase information, we take $N$ 1bit samples of each generated pulse. A suitable choice of the sampling frequency gives as a result a bit vector containing a subsampled version of each PSK pulse. Extremely simple digital processing of the vectors from two consecutive pulses allows symbol decision, together with information on signal quality and frequency displacements. Although presented for the QPSK case, the principle may be applied to the MPSK case with obvious changes. Experimental results on a 20 kbit/s proofof concept receiver in the 27 MHz band, achieving a sensitivity of103 dBm, with an FPGAbased implementation of the digital part, validate the proposed approach.

Enhanced sensitivity and contrast with bimodal atomic force microscopy with small and ultrasmall amplitudes in ambient conditions
http://hdl.handle.net/2117/21802
Title: Enhanced sensitivity and contrast with bimodal atomic force microscopy with small and ultrasmall amplitudes in ambient conditions
Authors: Santos Hernández, Sergio
Abstract: Here, we introduce bimodal atomic force microscopy operated with subnm and ultrasmall, i.e., subangstrom, first and second mode amplitudes in ambient conditions. We show how the tip can be made to oscillate in the proximity of the surface and in perpetual contact with the adsorbed water layers while the second mode amplitude and phase provide enhanced contrast and sensitivity.
Nonlinear and nonmonotonic behavior of the experimental observables is discussed theoretically with a view to high resolution, enhanced contrast, and minimally invasive mapping. Fractions of meV of energy dissipation are shown to provide contrast above the noise level.
Thu, 27 Feb 2014 18:55:59 GMT
http://hdl.handle.net/2117/21802
20140227T18:55:59Z
Santos Hernández, Sergio
no
Sample interaction regimes, Modulation AFM, Mode, Spectroscopy, Resolution, Surface, Energy
Here, we introduce bimodal atomic force microscopy operated with subnm and ultrasmall, i.e., subangstrom, first and second mode amplitudes in ambient conditions. We show how the tip can be made to oscillate in the proximity of the surface and in perpetual contact with the adsorbed water layers while the second mode amplitude and phase provide enhanced contrast and sensitivity.
Nonlinear and nonmonotonic behavior of the experimental observables is discussed theoretically with a view to high resolution, enhanced contrast, and minimally invasive mapping. Fractions of meV of energy dissipation are shown to provide contrast above the noise level.

Analog circuit test based on a digital signature
http://hdl.handle.net/2117/20632
Title: Analog circuit test based on a digital signature
Authors: Gómez Pau, Álvaro; Sanahuja Moliner, Ricard; Balado Suárez, Luz María; Figueras Pàmies, Joan
Abstract: Production verification of analog circuit specifica
tions is a challenging task requiring expensive test equipment
and time consuming procedures. This paper presents a method
for low cost onchip parameter verification based on the analysis
of a digital signature. A 65 nm CMOS onchip monitor is
proposed and validated in practice. The monitor composes two
signals (x(t), y(t)) and divides the XY plane with nonlinear
boundaries in order to generate a digital code for every analog
(x, y) location. A digital signature is obtained using the digital
code and its time duration. A metric defining a discrepancy factor
is used to verify circuit parameters. The method is applied to
detect possible deviations in the natural frequency of a Biquad
filter. Simulated and experimental results show the possibilities
of the proposal.
Fri, 15 Nov 2013 15:47:18 GMT
http://hdl.handle.net/2117/20632
20131115T15:47:18Z
Gómez Pau, Álvaro; Sanahuja Moliner, Ricard; Balado Suárez, Luz María; Figueras Pàmies, Joan
no
Production verification of analog circuit specifica
tions is a challenging task requiring expensive test equipment
and time consuming procedures. This paper presents a method
for low cost onchip parameter verification based on the analysis
of a digital signature. A 65 nm CMOS onchip monitor is
proposed and validated in practice. The monitor composes two
signals (x(t), y(t)) and divides the XY plane with nonlinear
boundaries in order to generate a digital code for every analog
(x, y) location. A digital signature is obtained using the digital
code and its time duration. A metric defining a discrepancy factor
is used to verify circuit parameters. The method is applied to
detect possible deviations in the natural frequency of a Biquad
filter. Simulated and experimental results show the possibilities
of the proposal.

Teaching materials for learning in english in the field of electronic. Material didáctico para el aprendizaje en inglés en el campo de la electrónica.
http://hdl.handle.net/2117/20543
Title: Teaching materials for learning in english in the field of electronic. Material didáctico para el aprendizaje en inglés en el campo de la electrónica.
Authors: Alsina Aubach, Montserrat; Argelaguet Isanta, María Rosa; Martínez Teixidor, Inmaculada; Vicente Rodrigo, Jesús
Abstract: In the context of the EHEA, the implementation of the degrees at the UPC
has represented changes to the Industrial Engineering studies that
were conducted at the Manresa School of Engineering (EPSEM). These
changes include teaching contents in a foreign language (CLIL), which
responds to the goal of improvement of language skills to facilitate
mobility and competitiveness. Furthermore, to ensure integration and
versatility common core subjects are introduced in different degrees of
Industrial Engineering and the new degree of ICT Systems Engineering,
taught at the EPSEM.
This paper presents the integration of both objectives, highlighting the
advantages of teaching the subject of Electronic Systems in English. The
electronics is a rapidly evolving field, so it is essential that students,
whatever their orientation in engineering is, learn basic English's
terminology on electronics and become fluent in oral expression and
comprehension. In this sense, an interdisciplinary group of professors from
the EPSEM, belonging to the research group RimaLinguatech, has worked
to develop innovative teaching materials. Regarding to electronics, that
includes from selection of terminology to the analysis of symbolic language
in English. In particular, questionnaires with audio files have been
implemented in Moodle, with results justifying the need for multilingual
verbalization of formulas (on line, as teaching resource in
http://mformulae.epsem.upc.edu/).; En el contexto del EEES, la implantación de los grados en la UPC ha
representado cambios en los estudios de Ingeniería Industrial que se
realizaban en la EPSEM. Estos cambios incluyen la impartición de
contenidos en lengua extranjera (AICLE), respondiendo al objetivo de
mejorar las competencias lingüísticas para facilitar la movilidad y la
competitividad. Además, para garantizar la integración y la versatilidad,
aparecen materias básicas en los diferentes grados de Ingeniería Industrial
y el nuevo grado de Ingeniería de Sistemas TIC, ofrecidos en la EPSEM.
En esta comunicación se plantea la integración de ambos objetivos,
destacando las ventajas de impartir la asignatura de Sistemas Electrónicos
en inglés. La electrónica es un campo en rápida evolución, por lo que es
esencial que los estudiantes, sea cual sea su orientación en la ingeniería,
aprendan la terminología electrónica básica en inglés y tengan fluidez sobre
todo en la comprensión y expresión oral. En este sentido, un grupo
interdisciplinario de profesores de la EPSEM, miembros del grupo de
investigación RimaLinguatech, ha trabajado para desarrollar materiales
docentes innovadores. En cuanto a la electrónica se refiere, ello incluye
desde selección de terminología, hasta el análisis del lenguaje simbólico
específico en inglés. En particular, se han implementado cuestionarios de
Moodle con archivos de audio, con resultados que justifican la necesidad de
verbalización multilingüe de fórmulas (en línea, como recurso didáctico en
http://mformulae.epsem.upc.edu/).
Wed, 06 Nov 2013 16:40:52 GMT
http://hdl.handle.net/2117/20543
20131106T16:40:52Z
Alsina Aubach, Montserrat; Argelaguet Isanta, María Rosa; Martínez Teixidor, Inmaculada; Vicente Rodrigo, Jesús
no
Electronics, CLIL, Innovation, Teaching material, Electrónica, AICLE, Innovación, Material docente
In the context of the EHEA, the implementation of the degrees at the UPC
has represented changes to the Industrial Engineering studies that
were conducted at the Manresa School of Engineering (EPSEM). These
changes include teaching contents in a foreign language (CLIL), which
responds to the goal of improvement of language skills to facilitate
mobility and competitiveness. Furthermore, to ensure integration and
versatility common core subjects are introduced in different degrees of
Industrial Engineering and the new degree of ICT Systems Engineering,
taught at the EPSEM.
This paper presents the integration of both objectives, highlighting the
advantages of teaching the subject of Electronic Systems in English. The
electronics is a rapidly evolving field, so it is essential that students,
whatever their orientation in engineering is, learn basic English's
terminology on electronics and become fluent in oral expression and
comprehension. In this sense, an interdisciplinary group of professors from
the EPSEM, belonging to the research group RimaLinguatech, has worked
to develop innovative teaching materials. Regarding to electronics, that
includes from selection of terminology to the analysis of symbolic language
in English. In particular, questionnaires with audio files have been
implemented in Moodle, with results justifying the need for multilingual
verbalization of formulas (on line, as teaching resource in
http://mformulae.epsem.upc.edu/).

Improved switching strategy for selective harmonic elimination in DCAC signal generation via pulsewidth modulation
http://hdl.handle.net/2117/20457
Title: Improved switching strategy for selective harmonic elimination in DCAC signal generation via pulsewidth modulation
Authors: Palacios Quiñonero, Francisco; Vicente Rodrigo, Jesús; Molina Hernández, M. Antonia; Karimi, Hamid Reza
Abstract: We present an advanced design methodology for pulsewidthmodulated (PWM) DCAC signal generation. Using design methods
based on the Walsh transform, AC sinusoidal signals can be approximated by suitable PWM signals. For different AC amplitudes,
the switching instants of the PWM signals can be efficiently computed by using appropriate systems of explicit linear equations.
However, the equation systems provided by conventional implementations of this approach are typically only valid for a restricted
interval of AC amplitudes and, in general, a supervised implementation of several equation systems is necessary to cover the full AC
amplitude range. Additionally, obtaining suitable equation systems for designs with a large number of switching instants requires
solving a complex optimization problem. In defining the constitutive pulses of a PWM signal, a suitable partition of the time interval
is used as a reference system. In the new methodology, pulses are chosen to be symmetric with respect to the partition points,
and the switching times are specified by means of switching ratios with respect to the endpoint subintervals. This approach leads
to particularly simple Walsh series representations, introduces a remarkable computational simplification, and achieves excellent
results in reducing the harmonic distortion.
Thu, 24 Oct 2013 16:38:30 GMT
http://hdl.handle.net/2117/20457
20131024T16:38:30Z
Palacios Quiñonero, Francisco; Vicente Rodrigo, Jesús; Molina Hernández, M. Antonia; Karimi, Hamid Reza
no
We present an advanced design methodology for pulsewidthmodulated (PWM) DCAC signal generation. Using design methods
based on the Walsh transform, AC sinusoidal signals can be approximated by suitable PWM signals. For different AC amplitudes,
the switching instants of the PWM signals can be efficiently computed by using appropriate systems of explicit linear equations.
However, the equation systems provided by conventional implementations of this approach are typically only valid for a restricted
interval of AC amplitudes and, in general, a supervised implementation of several equation systems is necessary to cover the full AC
amplitude range. Additionally, obtaining suitable equation systems for designs with a large number of switching instants requires
solving a complex optimization problem. In defining the constitutive pulses of a PWM signal, a suitable partition of the time interval
is used as a reference system. In the new methodology, pulses are chosen to be symmetric with respect to the partition points,
and the switching times are specified by means of switching ratios with respect to the endpoint subintervals. This approach leads
to particularly simple Walsh series representations, introduces a remarkable computational simplification, and achieves excellent
results in reducing the harmonic distortion.

Stability, resolution, and ultralow wear amplitude modulation atomic force microscopy of DNA: small amplitude small setpoint imaging
http://hdl.handle.net/2117/20287
Title: Stability, resolution, and ultralow wear amplitude modulation atomic force microscopy of DNA: small amplitude small setpoint imaging
Authors: Santos Hernández, Sergio; Barcons Xixons, Víctor; Christenson, Hugo K.; Billingsley, Daniel J.; Bonass, William A.; Font Teixidó, Josep; Thomson, Neil H.
Abstract: A way to operate fundamental mode amplitude
modulation atomic force microscopy is
introduced which optimizes stability and resolution for a given tip size and shows negligible tip
wear over extended time periods (
24 h). In small amplitude smal
l setpoint (SASS) imaging,
the cantilever oscillates with subnanometer am
plitudes in the proximity of the sample, without
the requirement of using large drive forces, a
s the dynamics smoothly lead the tip to the surface
through the water layer. SASS is demonstrat
ed on single molecules of doublestranded DNA in
ambient conditions where sharp silicon tips (R
2–5 nm) can resolve the righthanded double
helix
Thu, 03 Oct 2013 17:28:18 GMT
http://hdl.handle.net/2117/20287
20131003T17:28:18Z
Santos Hernández, Sergio; Barcons Xixons, Víctor; Christenson, Hugo K.; Billingsley, Daniel J.; Bonass, William A.; Font Teixidó, Josep; Thomson, Neil H.
no
Amplitude modulation
Atomic force microscopy
A way to operate fundamental mode amplitude
modulation atomic force microscopy is
introduced which optimizes stability and resolution for a given tip size and shows negligible tip
wear over extended time periods (
24 h). In small amplitude smal
l setpoint (SASS) imaging,
the cantilever oscillates with subnanometer am
plitudes in the proximity of the sample, without
the requirement of using large drive forces, a
s the dynamics smoothly lead the tip to the surface
through the water layer. SASS is demonstrat
ed on single molecules of doublestranded DNA in
ambient conditions where sharp silicon tips (R
2–5 nm) can resolve the righthanded double
helix