Design and Development of a Low-Cost Optical Current Sensor

In this paper we demonstrate the design of a low-cost optical current sensor. The sensor principle is the Faraday rotation of a light beam through a magneto-optical material, SF2, when a magnetic field is present. The prototype has a high sensitivity and a high linearity for currents ranging from 0 up to 800 A. The error of the optical fibre sensor is smaller than 1% for electric currents over 175 A.

Low‑cost origami fabrication of 3D self‑aligned hybrid microfluidic structures

[EN] 3D microfluidic device fabrication methods are normally quite expensive and tedious. In this paper, we present an easy and cheap alternative wherein thin cyclic olefin polymer (COP) sheets and pressure sensitive adhesive(PSA) were used to fabricate hybrid 3D microfluidic structures, by the Origami technique, which enables the fabrication of microfluidic devices without the need of any alignment tool. The COP and PSA layers were both cut simultaneously using a portable, low-cost plotter allowing for rapid prototyping of a large variety of designs in a single production step. The devices were then manually assembled using the Origami technique by simply combining COP and PSA layers and mild pressure. This fast fabrication method was applied, as proof of concept, to the generation of a micromixer with a 3D-stepped serpentine design made of ten layers in less than 8 min. Moreover, the micromixer was characterized as a function of its pressure failure, achieving pressures of up to 1000 mbar. This fabrication method is readily accessible across a large range of potential end users, such as educational agencies (schools,universities), low-income/developing world research and industry or any laboratory without access to clean room facilities, enabling the fabrication of robust, reproducible microfluidic devices.

Synthesis and characterization of low-cost materials for aqueous Na-ion batteries

136 p.

The Role of the Demand for Environmental Quality in Driving Transitions to Low-Polluting Energy Sources

4 p.

Evaluation of the conventional surveying equipment applied to deformation analysis of heritage buildings. A case study: the bell tower of Santa María la Blanca church in Agoncillo (La Rioja, Spain)

Contributed to: "Measuring the Changes": 13th FIG International Symposium on Deformation Measurements and Analysis; 4th IAG Symposium on Geodesy for Geotechnical and Structural Enginering (Lisbon, Portugal, May 12-15, 2008).

Methodological keys for the acquisition and long-term use of photographic collections representing elements of Heritage

Contributed to: Fusion of Cultures. XXXVIII Annual Conference on Computer Applications and Quantitative Methods in Archaeology – CAA2010 (Granada, Spain, Apr 6-9, 2010)

Optimización del proyecto de auscultación, dirigido al estudio de las deformaciones de un elemento patrimonial, mediante técnicas topográficas clásicas

[ES] Para más información véase el trabajo LDGP_mem_003-2: "Estudio topográfico de las deformaciones del conjunto arquitectónico de la iglesia de Nuestra Señora de la Blanca (Agoncillo, La Rioja) [Julio 2007 – Octubre 2009]", http://hdl.handle.net/10810/7050

Documentación y representación de paramentos verticales en riesgo de colapso. Aplicación en el Monasterio de San Prudencio (Clavijo, La Rioja)

[ES] Los datos de este registro provienen de la una actividad académica que también aparece descrita en el repositorio y desde donde se puede acceder a otros trabajos relacionados con el Monasterio:

On the Selection of Non-Invasive Methods Based on Speech Analysis Oriented to Automatic Alzheimer Disease Diagnosis

The work presented here is part of a larger study to identify novel technologies and biomarkers for early Alzheimer disease (AD) detection and it focuses on evaluating the suitability of a new approach for early AD diagnosis by non-invasive methods. The purpose is to examine in a pilot study the potential of applying intelligent algorithms to speech features obtained from suspected patients in order to contribute to the improvement of diagnosis of AD and its degree of severity. In this sense, Artificial Neural Networks (ANN) have been used for the automatic classification of the two classes (AD and control subjects). Two human issues have been analyzed for feature selection: Spontaneous Speech and Emotional Response. Not only linear features but also non-linear ones, such as Fractal Dimension, have been explored. The approach is non invasive, low cost and without any side effects. Obtained experimental results were very satisfactory and promising for early diagnosis and classification of AD patients.

Sliding mode position control for real-time control of induction motors

A sliding mode position control for high-performance real-time applications of induction motors in developed in this work. The design also incorporates a simple flux estimator in order to avoid the flux sensors. Then, the proposed control scheme presents a low computational cost and therefore can be implemented easily in a real-time applications using a low cost DSP-processor. The stability analysis of the controller under parameter uncertainties and load disturbances in provided using Lyapunov stability theory. Finally, simulated and experimental results show that the proposed controller with the proposed observer provides a good trajectory tracking and that this scheme is robust with respect to plant parameter variations and external load disturbances.

Design of a Sensor Based on Plastic Optical Fibre (POF) to Measure Fluid Flow and Turbidity

Although many optical fibre applications are based on their capacity to transmit optical signals with low losses, it can also be desirable for the optical fibre to be strongly affected by a certain physical parameter in the environment. In this way, it can be used as a sensor for this parameter. There are many strong arguments for the use of POFs as sensors. In addition to being easy to handle and low cost, they demonstrate advantages common to all multimode optical fibres. These specifically include flexibility, small size, good electromagnetic compatibility behaviour, and in general, the possibility of measuring any phenomenon without physically interacting with it. In this paper, a sensor based on POF is designed and analysed with the aim of measuring the volume and turbidity of a low viscosity fluid, in this case water, as it passes through a pipe. A comparative study with a commercial sensor is provided to validate the proven flow measurement. Likewise, turbidity is measured using different colour dyes. Finally, this paper will present the most significant results and conclusions from all the tests which are carried out.

Un electrocardiógrafo inteligente de bajo coste

Castellano: A lo largo de este proyecto se ha desarrollado un sistema de bajo coste para la tomade electrocardiogramas y posterior visualización de los mismos en un dispositivo Android. Además se ha creado un módulo inteligente capaz de realizar un diagnóstico de manera automática y razonada sobre los datos recogidos. El proyecto se ha realizado principalmente sobre tecnologías abiertas: Arduino como componente central del sistema electrónico, Android para visualizar datos en una plataforma móvil y CLIPS como motor sobre el cual se ha desarrollado el sistema experto que realiza el diagnóstico.

Adaptive Scalable SVD Unit for Fast Processing of Large LSE Problems

Singular Value Decomposition (SVD) is a key linear algebraic operation in many scientific and engineering applications. In particular, many computational intelligence systems rely on machine learning methods involving high dimensionality datasets that have to be fast processed for real-time adaptability. In this paper we describe a practical FPGA (Field Programmable Gate Array) implementation of a SVD processor for accelerating the solution of large LSE problems. The design approach has been comprehensive, from the algorithmic refinement to the numerical analysis to the customization for an efficient hardware realization. The processing scheme rests on an adaptive vector rotation evaluator for error regularization that enhances convergence speed with no penalty on the solution accuracy. The proposed architecture, which follows a data transfer scheme, is scalable and based on the interconnection of simple rotations units, which allows for a trade-off between occupied area and processing acceleration in the final implementation. This permits the SVD processor to be implemented both on low-cost and highend FPGAs, according to the final application requirements.

Polilaktida oinarri duten inplante polimeriko biodegradagarrien diseinu, fabrikazio eta propietateak

[EU]3D inprimaketa gaur egun, biomedikuntzaren garapenerako aukera ezberdinak ematen dituen teknologia iraultzaile gisa aurkezten da; bai medikuntza arloan formazio eta ikerkuntzarako erreminta gisa, baita dispositibo berrien diseinu eta fabrikaziorako. Bere abantailarik aipagarriena prototipaketa azkarra da. Gainera, teknologia honek barne egitura eta forma ezberdineko objektuak fabrikatzea ahalbidetzen du koste lehiakor batean. Lan honen helburua 3D inprimagailuen bidezko prototipoen fabrikazioan zentratzen da, horretarako lehengai bezala polimero biodegradagarri eta biobateragarria erabiliz. Horrez gain, metodo tradizionalarekin konparatuz teknologia honek izan ditzakeen abantailak ere aztertu nahi dira, ez bakarrik alde ekonomikoari edo denborari begira, baita fabrikatutako objektuen propietateei begira ere. Dena dela, horrekin hasi aurretik ezaugarritze fisiko eta termikoa burutu beharko zaie lehengaiei, 3D inprimagailuaren parametroen aukeraketa egokia egiteko eta parametro horien eta amaierako produktuaren kalitate, egitura eta propietateen artean erlazio egokia ezartzeko. Lan hau aurrera eramateko poli(L-laktida)-rekin (PLLA) egingo da lan, bai ehun ingeniaritzan baita hezurren apurketen finkapenerako dispositiboetan oso erabilia izan den polimeroa.

Reloj basado en señales GPS con corrección digital para PTP-Master

[ES]este proyecto trata sobre el desarrollo de un core en una FPGA para conseguir, gracias a un módulo GPS, una referencia temporal precisa, necesaria para un equipo PTP master (IEEE-1588), a bajo coste y con calidad Grand Master.