Situació actual del català dins l'ensenyament privat i privat-concertat a Mallorca

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Delfos, un recurs interactiu per l'estudi de dispositius electrònics

Es presenta un programa interactiu per a un curs bàsic de dispositius semiconductors suportat per ordinador personal. Els destinataris primers són els alumnes de la titulació de segon cicle en Enginyeria Electrònica de la UPC, en particular aquells que la segueixen en format semipresencial. El material presentat s’ajusta al programa d’una de les assignatures del curriculum i al text de referència que s’utilitza. L’objectiu és presentar una col·lecció d’exercicis, prou extensa per cobrir tots els conceptes importants de la matèria, que l’alumne pugui utilitzar per autoavaluar-se, Eventualment, el professor podrà fer servir el mateix recurs per qualificar l’estudiant. El material és d’accés lliure per xarxa.Peer ReviewedPostprint (published version

Dos qüestionaris interactius d'electrònica: CyDEL i DELFos

Es presenten dos qüestionaris interactius d'electrònica: CyDEL, dedicat a l'anàlisi de circuits electrònics bàsics i que dona suport a l'assignatura troncal "CISE 1" d'Enginyeria de Telecomunicació, i DELFOS, per a l'assignatura troncal "DEF 1" d'Enginyeria Electrònica que tracta de l'estudi de dispositius electrònics i fotònics. Un qüestionari interactiu és un programa informàtic que s'executa sobre un ordinador personal i que conté una extensa base de dades d'exercicis d'una determinada matèria. Els qüestionaris admeten fins a quatre diferents modes de treball: a) El mode estudi, pensat per ajudar l'estudiant a aprendre la resolució d'exercicis, per la qual cosa es permet la consulta a pàgines d'ajut i a la solució correcta de l'exercici. b) El mode avaluació, pensat per a que l'estudiant pugui avaluar els coneixements adquirits, es presenta com un examen tipus test amb un full final de correcció que proporciona la nota i el temps dedicat a resoldre'l. c) El mode de resolució de problemes guiats, en el qual l'estudiant pot consultar "pistes" per resoldre cadascun dels apartats i la solució corresponent. d) El mode lectura, que permet a l'estudiant consultar les pàgines d'ajut com si fos un llibre de teoria. En aquest treball es descriuen ambdós qüestionaris i la seva utilització com eina d'aprenentatge

Exploring the Tuning Range of Channel Filters for Satellite Applications Using Electromagnetic-Based Computer Aided Design Tools

© 2018 IEEE. Personal use of this material is permitted. Permissíon from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertisíng or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.[EN] The objective of this paper is to use electromagnetic-based computer-aided design (CAD) tools to investigate the maximum tuning range of channel filters, typically used in satellite payloads. Both circular and rectangular waveguide technologies are investigated. The results of the investigation show that single-mode rectangular waveguide implementations offer substantially wider tuning range, as opposed to classical dual-mode circular waveguide implementations. In addition to simulations, measurements are also presented indicating very good agreement with theory, thereby fully validating the CAD procedure.This work was supported in part by MINECO (Spanish Government) under Research and Development Project TEC2016-75934-C4-1-R and in part by Research and Development Technicians under Grant PTA2015-10839-I.Ossorio-García, J.; Vague Cardona, JJ.; Boria Esbert, VE.; Guglielmi, M. (2018). Exploring the Tuning Range of Channel Filters for Satellite Applications Using Electromagnetic-Based Computer Aided Design Tools. IEEE Transactions on Microwave Theory and Techniques. 66(2):717-725. https://doi.org/10.1109/TMTT.2017.2769083S71772566

Dielectric characterization of healthy and malignant colon tissues in the 0.5 18 GHz frequency band

Several reports over the last few decades have shown that the dielectric properties of healthy and malignant tissues of the same body organ usually show different values. However, no intensive dielectric studies of human colon tissue have been performed, despite colon cancer's being one of the most common types of cancer in the world. In order to provide information regarding this matter, a dielectric characterization of healthy and malignant colon tissues is presented. Measurements are performed on ex vivo surgery samples obtained from 20 patients, using an open-ended coaxial probe in the 0.5 18 GHz frequency band. Results show that the dielectric constant of colon cancerous tissue is 8.8% higher than that of healthy tissues (p = 0.002). Besides, conductivity is about 10.6% higher, but in this case measurements do not have statistical significance (p = 0.038). Performing an analysis per patient, the differences in dielectric constant between healthy and malignant tissues appear systematically. Particularized results for specific frequencies (500 MHz, 900 MHz, 2.45 GHz, 5 GHz, 8.5 GHz and 15 GHz) are also reported. The findings have potential application in early-stage cancer detection and diagnosis, and can be useful in developing new tools for hyperthermia treatments as well as creating electromagnetic models of healthy and cancerous tissues.The authors would like to thank the medical staff of the endoscopy unit of Hospital Universitari i Politecnic La Fe for their assistance in the gathering of tissue samples. This work was supported by Ministerio de Economia y Competitividad, Spain (ref. TEC2014-60258-C2-1-R, TEC2014-56469-REDT), by FEDER funds, and by a UPV-IISLaFe action (CEI-2G, 2014).Fornés Leal, A.; García Pardo, C.; Frasson, M.; Pons Beltrán, V.; Cardona Marcet, N. (2016). Dielectric characterization of healthy and malignant colon tissues in the 0.5 18 GHz frequency band. Physics in Medicine and Biology. 61(20):7334-7346. https://doi.org/10.1088/0031-9155/61/20/7334S73347346612

Substrate Integrated Waveguide Diplexer Based on Circular Triplet Combline Filters

The design of substrate integrated waveguide (SIW) diplexers, based on combline triplet sections with transmission zeros (TZs) placed below and above the passband, is presented. In order to control the location of the TZs, positive and negative couplings are conveniently provided. A highly compact implementation based on circular substrate integrated coaxial resonators is proposed. An X band diplexer with channel center frequencies at 9.5 and 10.5 GHz and absolute bandwidths of 400 MHz is designed. The structure shows important advantages in terms of size reduction, while keeping good insertion losses as well as high rejection and isolation levels.This work was supported by MINECO (Spanish Government) under projects TEC2103-47037-C5-1-R and TEC2013-48036-C3-3-R.Sirci, S.; Martínez Pérez, JD.; Vague Cardona, JJ.; Boria Esbert, VE. (2015). Substrate Integrated Waveguide Diplexer Based on Circular Triplet Combline Filters. IEEE Microwave and Wireless Components Letters. 25(7):430-432. doi:10.1109/LMWC.2015.2427516S43043225

Novel Planar and Waveguide Implementations of Impedance Matching Networks Based on Tapered Lines Using Generalized Superellipses

(c) 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this[EN] For the practical implementation of RF and microwave impedance matching networks, a widely employed solution¿alternative to the use of classical impedance transformers¿is based on tapered lines. This paper shows a simple method to design smooth tapers that take into account the dispersion of the line and the required design bandwidth simultaneously. A planar taper has been designed in microstrip technology with the same length of classical ones but improving their performances. A waveguide prototype has also been designed with similar performance to a commercial one but with one third of its length. Both tapered structures have been obtained through the optimization of very few parameters using the same design strategy. As a result, the reflection coefficient of the tapers can be optimally adapted to a given specific mask using the prescribed value of physical length. Experimental results for both tapers are included for the validation of the proposed topologies and the related design method.This work was supported by MINECO (Spanish Government) through R&D under Project TEC2016-75934-C4-1-R.Cogollos, S.; Vague Cardona, JJ.; Boria Esbert, VE.; Martínez Pérez, JD. (2018). Novel Planar and Waveguide Implementations of Impedance Matching Networks Based on Tapered Lines Using Generalized Superellipses. IEEE Transactions on Microwave Theory and Techniques. 66(4):1874-1884. https://doi.org/10.1109/TMTT.2018.2791952S1874188466

Optimized Design of Combline Filters with Transmission Zeros

[EN] The objective of this paper is to demonstrate how inline combline filters can be designed to implement transmission zeros in the filter transfer function. Following the design procedure described in this paper, up to N-1 transmission zeros can be implemented with a filter of order N. In addition to theory, comparisons between simulated and measured results are also presented. The agreement between simulation and measurements is indeed good, thereby fully validating the new combline filter topology, and the proposed design technique.Vague Cardona, JJ.; Ossorio García, J.; Cogollos, S.; Boria Esbert, VE.; Guglielmi, M. (2019). Optimized Design of Combline Filters with Transmission Zeros. IEEE. 1-3. https://doi.org/10.1109/NEMO.2019.8853819S1

Impact of Receivers Location on the Accuracy of Capsule Endoscope Localization

[EN] In recent years, localization for capsule endoscopy applications using Ultra-Wideband (UWB) technology has become an attractive field of study due to its potential benefits for patients. Performance analysis of RF-based localization techniques are very limited in literature. Most of the available studies rely on software simulations using digital human models. Nonetheless, no realistic studies based on in-vivo measurements has been reported yet. This paper investigates the performance of RSS-based technique for three-dimensional (3D) localization in the UWB frequency band. Impact of receivers selection as well as of the evaluated path loss model on the localization accuracy is investigated. Results obtained through CST-based simulations and from recently conducted in-vivo measurements are presented and compared.This work was supported by the European Union's H2020:MSCA:ITN program for the "Wireless In-body Environment Communication- WiBEC" project under the grant agreement no. 675353. This work was also funded by the Ministerio de Economia y Competitividad, Spain (TEC2014-60258-C2-1-R), by the European FEDER funds.Barbi, M.; Garcia-Pardo, C.; Cardona Marcet, N.; Andrea Nevárez; Vicente Pons Beltrán; Frasson, M. (2018). Impact of Receivers Location on the Accuracy of Capsule Endoscope Localization. IEEE. 340-344. https://doi.org/10.1109/PIMRC.2018.8580862S34034

El patrimonio minero de la comarca del Alto Palancia/Alt Palancia (Castellón, Comunidad Valenciana, Sistema Ibérico)

En este trabajo se va a continuar con la serie dedicada al comarcal de diferentes comunidades autónomas. Así, en este caso nos centraremos en la comarca del Alto Palancia / Alt Palància, situada en la Comunidad Valenciana. De esta forma, intentaremos plasmar los trabajos de campo efectuados durante el año 2011. Tal como hemos venido diciendo en los trabajos precedentes, dedicados a la Comunidad de Aragón, también en este caso cabe decir que no se trata de un inventario exhaustivo del Patrimonio Minero de la comarca del Alto Palancia / Alt Palancia, se trata simplemente un catálogo de los lugares de interés del Patrimonio Minero que se han ido encontrando mientras se estaba haciendo el trabajo de inventariado de las explotaciones mineras. La comarca castellonense del Alto Palancia / Alt Palancia, ocupa una posición meridional dentro de las comarcas castellonenses. Por otra parte, dentro de la Comunidad Valenciana ocupa una posición más bien centro – septentrional. Así, es limítrofe con las comarcas del Alto Mijares / Alt Millars (por el Nordeste), Plana Baixa (por el Este), Camp de Morvedre (por el Sureste), Camp de Túria (por el Sur), el Serrans (por el Este) y la comarca aragonesa de Gúdar – Javalambre (por el Noroeste). Es decir: limita con un amplio conjunto de comarcas castellonenses (las dos primeras), valencianas (las tres siguientes) y turolenses (la última). Por otra parte, la comarca del Alto Palancia / Alt Palancia, se halla totalmente ubicada sobre una de las dos unidades geológicas que constituyen el suelo y el subsuelo de la Comunidad Valenciana. En efecto, esta comarca se halla situada totalmente dentro del Sistema Ibérico. Como consecuencia de ello cabe decir que los materiales que afloran en su subsuelo son fundamentalmente mesozoicos, repartiéndose entre el Triásico, el Jurásico y el Cretácico. 744 La comarca del Alto Palancia, ha tenido numerosas actividades mineras desarrolladas a través de distintas épocas históricas, aunque en la actualidad se hallan todas inactivas, a excepción de las explotaciones de áridos. No obstante, ha habido actividades dedicadas al beneficio del Mercurio (en la zona septentrional de la Sierra del Espadan), así como diversas explotaciones de baritina, de minerales de cobalto y de yeso, en diversos lugares de la comarca. Como consecuencia de estas explotaciones, se ha generado un variado Patrimonio Minero, con numerosos LIPM (Lugares de Interés del Patrimonio Minero), de los que iremos hablando a lo largo de esta comunicación.Peer ReviewedPostprint (published version