Departament de Disseny i Programació de Sistemes Electrònics (fins octubre 2015)
http://hdl.handle.net/2117/7019
2024-03-29T07:45:14ZEstablishing nanoscale heterogeneity with nanoscale force measurements
http://hdl.handle.net/2117/78535
Establishing nanoscale heterogeneity with nanoscale force measurements
Chang, Yun-Hsiang, Yun-Hsiang; Olukan, Tuza; Lai, Chia-Yun; Santos, Sergio; Lin, Tze-Yu; Apostoleris, Harry; Font Teixidó, Josep; Barcons Xixons, Víctor; Chiesa, Matteo
Establishing the presence or absence of nanoscale compositional heterogeneity with nanoscale resolution is becoming instrumental for the development of many fields of science. Force versus distance measurements and parameters directly or indirectly derived from these profiles can be potentially employed for this purpose with sophisticated instruments such as the atomic force microscope (AFM). On the other hand, standards are necessary to reproducibly and conclusively support hypothesis from experimental data and these standards are still emerging. Here, we define a set of standards for providing data originating from atomic force measurements to be employed to compare between sample properties, parameters, or, more generally, compositional heterogeneity. We show that reporting the mean and standard deviation only might lead to inconsistent conclusions. The fundamental principle behind our investigation deals with the very definition of reproducibility and repeatability in terms of accuracy and precision, and we establish general criteria to ensure that these hold without the need of restricting assumptions.
2015-10-29T19:05:50ZChang, Yun-Hsiang, Yun-HsiangOlukan, TuzaLai, Chia-YunSantos, SergioLin, Tze-YuApostoleris, HarryFont Teixidó, JosepBarcons Xixons, VíctorChiesa, MatteoEstablishing the presence or absence of nanoscale compositional heterogeneity with nanoscale resolution is becoming instrumental for the development of many fields of science. Force versus distance measurements and parameters directly or indirectly derived from these profiles can be potentially employed for this purpose with sophisticated instruments such as the atomic force microscope (AFM). On the other hand, standards are necessary to reproducibly and conclusively support hypothesis from experimental data and these standards are still emerging. Here, we define a set of standards for providing data originating from atomic force measurements to be employed to compare between sample properties, parameters, or, more generally, compositional heterogeneity. We show that reporting the mean and standard deviation only might lead to inconsistent conclusions. The fundamental principle behind our investigation deals with the very definition of reproducibility and repeatability in terms of accuracy and precision, and we establish general criteria to ensure that these hold without the need of restricting assumptions.Problemes de modelització amb UML. Programació orientada a objectes
http://hdl.handle.net/2117/78444
Problemes de modelització amb UML. Programació orientada a objectes
Brínquez Jiménez, Jordi; Dodero Beardo, Juan Manuel; Tarres Puertas, Marta Isabel
2015-10-28T15:20:47ZBrínquez Jiménez, JordiDodero Beardo, Juan ManuelTarres Puertas, Marta IsabelEl llenguatge Java
http://hdl.handle.net/2117/78433
El llenguatge Java
Tarres Puertas, Marta Isabel
2015-10-28T14:24:13ZTarres Puertas, Marta IsabelGeometric constraint graphs decomposition based on computing graph circuits
http://hdl.handle.net/2117/78430
Geometric constraint graphs decomposition based on computing graph circuits
Joan Arinyo, Robert; Tarres Puertas, Marta Isabel; Vila Marta, Sebastià
Geometric constraint solving is a growing field which plays a paramount role in industrial applications and that is deeply rooted in automated deduction in geometry. In this work we report on an algorithm to solve geometric
constraint-based problems by decomposing biconnected graphs. The algorithm is based on recursively splitting the graph through sets with three vertices located on fundamental circuits of the graph. Preliminary practical experiments suggest that the algorithm runtime is at worst quadratic with the total number of vertices in the graph.
2015-10-28T14:11:03ZJoan Arinyo, RobertTarres Puertas, Marta IsabelVila Marta, SebastiàGeometric constraint solving is a growing field which plays a paramount role in industrial applications and that is deeply rooted in automated deduction in geometry. In this work we report on an algorithm to solve geometric
constraint-based problems by decomposing biconnected graphs. The algorithm is based on recursively splitting the graph through sets with three vertices located on fundamental circuits of the graph. Preliminary practical experiments suggest that the algorithm runtime is at worst quadratic with the total number of vertices in the graph.Periodicity in bimodal atomic force microscopy
http://hdl.handle.net/2117/76907
Periodicity in bimodal atomic force microscopy
Lai, Chia-Yun; Barcons Xixons, Víctor; Santos, Sergio; Chiesa, Matteo
Periodicity is fundamental for quantification and the application of conservation principles of many important systems. Here, we discuss periodicity in the context of bimodal atomic force microscopy (AFM). The relationship between the excited frequencies is shown to affect and control both experimental observables and the main expressions quantified via these observables, i.e., virial and energy transfer expressions, which form the basis of the bimodal AFM theory. The presence of a fundamental frequency further simplifies the theory and leads to close form solutions. Predictions are verified via numerical integration of the equation of motion and experimentally on a mica surface.
2015-09-17T14:41:26ZLai, Chia-YunBarcons Xixons, VíctorSantos, SergioChiesa, MatteoPeriodicity is fundamental for quantification and the application of conservation principles of many important systems. Here, we discuss periodicity in the context of bimodal atomic force microscopy (AFM). The relationship between the excited frequencies is shown to affect and control both experimental observables and the main expressions quantified via these observables, i.e., virial and energy transfer expressions, which form the basis of the bimodal AFM theory. The presence of a fundamental frequency further simplifies the theory and leads to close form solutions. Predictions are verified via numerical integration of the equation of motion and experimentally on a mica surface.Low level control of an omnidirectional mobile robot
http://hdl.handle.net/2117/76658
Low level control of an omnidirectional mobile robot
Comasòlivas Font, Ramon; Quevedo Casín, Joseba Jokin; Escobet Canal, Teresa; Escobet Canal, Antoni; Romera Formiguera, Juli
2015-09-07T11:46:46ZComasòlivas Font, RamonQuevedo Casín, Joseba JokinEscobet Canal, TeresaEscobet Canal, AntoniRomera Formiguera, JuliSubharmonic excitation in amplitude modulation atomic force microscopy in the presence of adsorbed water layers
http://hdl.handle.net/2117/27854
Subharmonic excitation in amplitude modulation atomic force microscopy in the presence of adsorbed water layers
Santos Hernández, Sergio; Barcons Xixons, Víctor; Verdaguer, Albert; Chiesa, Matteo
In ambient conditions, nanometric water layers form on hydrophilicsurfaces covering them and significantly changing their properties and characteristics. Here we report the excitation of subharmonics in amplitude modulation atomic force microscopy induced by intermittent water contacts. Our simulations show that there are several regimes of operation depending on whether there is perturbation of water layers. Single period orbitals, where subharmonics are never induced, follow only when the tip is either in permanent contact with the water layers or in pure noncontact where the water layers are never perturbed. When the water layers are perturbed subharmonic excitation increases with decreasing oscillation amplitude. We derive an analytical expression which establishes whether water perturbations compromise harmonic motion and show that the predictions are in agreement with numerical simulations. Empirical validation of our interpretation is provided by the observation of a range of values for apparent height of water layers when subharmonic excitation is predicted.
2015-05-08T16:01:38ZSantos Hernández, SergioBarcons Xixons, VíctorVerdaguer, AlbertChiesa, MatteoIn ambient conditions, nanometric water layers form on hydrophilicsurfaces covering them and significantly changing their properties and characteristics. Here we report the excitation of subharmonics in amplitude modulation atomic force microscopy induced by intermittent water contacts. Our simulations show that there are several regimes of operation depending on whether there is perturbation of water layers. Single period orbitals, where subharmonics are never induced, follow only when the tip is either in permanent contact with the water layers or in pure noncontact where the water layers are never perturbed. When the water layers are perturbed subharmonic excitation increases with decreasing oscillation amplitude. We derive an analytical expression which establishes whether water perturbations compromise harmonic motion and show that the predictions are in agreement with numerical simulations. Empirical validation of our interpretation is provided by the observation of a range of values for apparent height of water layers when subharmonic excitation is predicted.Superregenerative reception of narrowband FSK modulations
http://hdl.handle.net/2117/27802
Superregenerative reception of narrowband FSK modulations
Palà Schönwälder, Pere; Bonet Dalmau, Jordi; López Riera, Alexis; Moncunill Geniz, Francesc Xavier; Águila López, Francisco del; Giralt Mas, Ma. Rosa
In this paper we investigate the possibilities of narrowband FSK detection using a superregenerative (SR) receiver. Previous SR FM demodulation techniques rely on detecting the amplitude variations caused by the different frequencies involved in FSK modulation. However, this requires relatively high frequency deviations because the frequency response of SR receivers is not very selective. In this paper we take a different approach, exploiting the distinct phase trajectories of FSK modulations resulting from the transmitted data. The well-known fact that the SR oscillator response preserves the phase information of the received signal is successfully exploited to allow the detection of several FSK modulations. These include the special case of MSK, opening the way to applying the SR principle to several communication standards, such as IEEE 802.15.4. The key ideas for symbol synchronization are also presented. Experimental results on a 10 kbit/s proof-of-concept MSK receiver, achieving a sensitivity better than -114 dBm in the HF band, validate the proposed approach.
2015-05-06T17:58:45ZPalà Schönwälder, PereBonet Dalmau, JordiLópez Riera, AlexisMoncunill Geniz, Francesc XavierÁguila López, Francisco delGiralt Mas, Ma. RosaIn this paper we investigate the possibilities of narrowband FSK detection using a superregenerative (SR) receiver. Previous SR FM demodulation techniques rely on detecting the amplitude variations caused by the different frequencies involved in FSK modulation. However, this requires relatively high frequency deviations because the frequency response of SR receivers is not very selective. In this paper we take a different approach, exploiting the distinct phase trajectories of FSK modulations resulting from the transmitted data. The well-known fact that the SR oscillator response preserves the phase information of the received signal is successfully exploited to allow the detection of several FSK modulations. These include the special case of MSK, opening the way to applying the SR principle to several communication standards, such as IEEE 802.15.4. The key ideas for symbol synchronization are also presented. Experimental results on a 10 kbit/s proof-of-concept MSK receiver, achieving a sensitivity better than -114 dBm in the HF band, validate the proposed approach.Asignaturas de Electrònica en la EPSEM: planificación de la impartición en inglés
http://hdl.handle.net/2117/27359
Asignaturas de Electrònica en la EPSEM: planificación de la impartición en inglés
Alsina Aubach, Montserrat; Argelaguet Isanta, María Rosa; Vicente Rodrigo, Jesús; Martínez Teixidor, Inmaculada
Al objeto de garantizar la calidad del aprendizaje de la Electrónica en los estudios de Grado impartidos en la EPSEM, es necesario planificar de manera adecuada las asignaturas impartidas en inglés. En este trabajo se muestran los resultados del análisis realizado a los estudiantes que cursarán estas asignaturas, en el que se ponen de manifiesto las dificultades observadas y las expectativas generadas, motivando la elaboración de material de soporte específico.; In order to ensure the quality of learning of Electronics for graduate studies offered at the EPSEM, it is needed to plan properly the subjects taught in English. In this paper the results of the students analysis who will attend these courses are shown. These results reveal the difficulties encountered and the
expectations generated. This analysis motives the development of specific support material.
2015-04-15T15:43:15ZAlsina Aubach, MontserratArgelaguet Isanta, María RosaVicente Rodrigo, JesúsMartínez Teixidor, InmaculadaAl objeto de garantizar la calidad del aprendizaje de la Electrónica en los estudios de Grado impartidos en la EPSEM, es necesario planificar de manera adecuada las asignaturas impartidas en inglés. En este trabajo se muestran los resultados del análisis realizado a los estudiantes que cursarán estas asignaturas, en el que se ponen de manifiesto las dificultades observadas y las expectativas generadas, motivando la elaboración de material de soporte específico.
In order to ensure the quality of learning of Electronics for graduate studies offered at the EPSEM, it is needed to plan properly the subjects taught in English. In this paper the results of the students analysis who will attend these courses are shown. These results reveal the difficulties encountered and the
expectations generated. This analysis motives the development of specific support material.A proof-of-concept superregenerative QPSK transceiver
http://hdl.handle.net/2117/26599
A proof-of-concept superregenerative QPSK transceiver
López Riera, Alexis; Palà Schönwälder, Pere; Bonet Dalmau, Jordi; Moncunill Geniz, Francesc Xavier; Águila López, Francisco del; Giralt Mas, Ma. Rosa
In this paper we present a description and experimental verification of an HF-band proof-of-concept superregenerative transceiver for QPSK signals. We describe a simple implementation of an all-digital, FPGA-based, QPSK transmitter section. On the receiver side, the quench signal is generated in the same FPGA with a minimum of analog circuitry. As the main novelty, we present a simple synchronization scheme suitable for packetized transmissions.
2015-03-05T15:13:01ZLópez Riera, AlexisPalà Schönwälder, PereBonet Dalmau, JordiMoncunill Geniz, Francesc XavierÁguila López, Francisco delGiralt Mas, Ma. RosaIn this paper we present a description and experimental verification of an HF-band proof-of-concept superregenerative transceiver for QPSK signals. We describe a simple implementation of an all-digital, FPGA-based, QPSK transmitter section. On the receiver side, the quench signal is generated in the same FPGA with a minimum of analog circuitry. As the main novelty, we present a simple synchronization scheme suitable for packetized transmissions.