Design, analysis and implementation of a versatile low level radio frequency system for accelerating cavities

179 p.

Performance of an Ocean Energy Conversion System with DFIG Sensorless Control

The 2009/28/EC Directive requires Member States of the European Union to adopt a National Action Plan for Renewable Energy. In this context, the Basque Energy Board, EVE, is committed to research activities such as the Mutriku Oscillating Water Column plant, OWC. This is an experimental facility whose concept consists of a turbine located in a pneumatic energy collection chamber and a doubly fed induction generator that converts energy extracted by the turbine into a form that can be returned to the network. The turbo-generator control requires a precise knowledge of system parameters and of the rotor angular velocity in particular. Thus, to remove the rotor speed sensor implies a simplification of the hardware that is always convenient in rough working conditions. In this particular case, a Luenberger based observer is considered and the effectiveness of the proposed control is shown by numerical simulations. Comparing these results with those obtained using a traditional speed sensor, it is shown that the proposed solution provides better performance since it increases power extraction in the sense that it allows a more reliable and robust performance of the plant, which is even more relevant in a hostile environment as the ocean.

Fast and Efficient Neural Conversion of Human Hematopoietic Cells

Neurons obtained directly from human somatic cells hold great promise for disease modeling and drug screening. Available protocols rely on overexpression of transcription factors using integrative vectors and are often slow, complex, and inefficient. We report a fast and efficient approach for generating induced neural cells (iNCs) directly from human hematopoietic cells using Sendai virus. Upon SOX2 and c-MYC expression, CD133-positive cord blood cells rapidly adopt a neuroepithelial morphology and exhibit high expansion capacity. Under defined neurogenic culture conditions, they express mature neuronal markers and fire spontaneous action potentials that can be modulated with neurotransmitters. SOX2 and c-MYC are also sufficient to convert peripheral blood mononuclear cells into iNCs. However, the conversion process is less efficient and resulting iNCs have limited expansion capacity and electrophysiological activity upon differentiation. Our study demonstrates rapid and efficient generation of iNCs from hematopoietic cells while underscoring the impact of target cells on conversion efficiency.

Diseño de un programa de Surf recreativo enfocado a colectivos con Síndrome de Down de 6 a 10 años

El objetivo de este trabajo es diseñar un programa de surf recreativo enfocado a colectivos con Síndrome de Down de 6 a 10 años. El Síndrome de Down se define como una discapacidad intelectual causada por una alteración en el par de cromosomas 21 (OMS, 2011). Resulta de especial relevancia el tratamiento de dicha discapacidad de manera no farmacológica, destacando la actividad física, en este caso el surf, como elemento inclusivo a nivel físico, psicológico y social. Se analizan distintos programas de Actividad Física en el medio acuático con personas con Síndrome de Down y se presenta el Surf como elemento que provoca grandes beneficios. A continuación se presenta el diseño de un programa que podría llevarse a cabo en un entorno cercano a nuestro territorio con un atractivo elevado ya que se trata de un proyecto innovador y beneficioso para personas con Síndrome de Down y sus familiares.

Down sindromea duen kolektiboaren agilidadean, koordinazioan eta orekan taekwondo-a duen eragina

[EUS] Proiektu honen bitartez, Down sindromea pairatzen duten, >14 urteko 8 parte hartzaileen agilidadea, koordinazioa eta oreka ebaluatu izan da, taekwondo-ko ordu bateko lau saio eginez. Aipaturiko faktoreak neurtzeko, ECOMI eskala egokitua erabili da. Hau, lehenengo eta azkenengo saioetan erabili izan da, datuak hartzeko eta konparaketak egin ahal izateko, eboluzioa ikusiz. Neurketak behin eginda, ikusi egin da bai koordinazioan eta orekan hobekuntzak izan dituztela orokorrean, aldiz, agilitatean ez da hobekuntza aipagarririk egon, eta aldi berean, parte hartzaileen arteko aldea nahiko nabarmena izan da. Hobekuntza ezak edo txikiak izateak, denbora eskasagatik izan dela esan daiteke. Beste autore batzuen esanetan, 20 saiotan hobekuntza nabarmenak lortu daitezke.

Down sindromea duten umeen inklusibitatea eta dantza klasikoaren onurak haiengan

Gai honekiko interesa, aurreko urtean “Jarduera fisiko inklusiboa” irakasgaia hasi genuenean piztu zitzaidan eta lan hau egitea erabakitzearen arrazoia, dantza campus batean monitore moduan bizitako esperientzia izan zen. Bertan, gaixotasun ezberdinak zituzten umeak elkartu ziren gure klubeko umeekin batera lan egiteko eta dantza egiten gozatzen zutena ikusita gozatzen nuen nik ere. Baina bereziki, Down Sindromea (DS) duten umeekin lan egiteko gogoa sortu zitzaidan. Horren geroztik, gaixotasun hau duten pertsonekin lan egiten duten dantza taldeak badaudela aurkitu nuen, baina nire asmoa ez da soilik DS duten umeei dantza egiten irakastea, baizik eta ume hauen eta gaixotasunik ez dutenen arteko elkarlana bultzatzea ere, inklusibitatea hain zuzen, baita dantzak haiengan sortzen dituen onurak aztertzea ere, bai fisiko zein psikologikoki.

Modeling Innovative Power Take-Off Based on Double-Acting Hydraulic Cylinders Array for Wave Energy Conversion

One of the key systems of a Wave Energy Converter for extraction of wave energy is the Power Take-Off (PTO) device. This device transforms the mechanical energy of a moving body into electrical energy. This paper describes the model of an innovative PTO based on independently activated double-acting hydraulic cylinders array. The model has been developed using a simulation tool, based on a port-based approach to model hydraulics systems. The components and subsystems used in the model have been parameterized as real components and their values experimentally obtained from an existing prototype. In fact, the model takes into account most of the hydraulic losses of each component. The simulations show the flexibility to apply different restraining torques to the input movement depending on the geometrical configuration and the hydraulic cylinders on duty, easily modified by a control law. The combination of these two actions allows suitable flexibility to adapt the device to different sea states whilst optimizing the energy extraction. The model has been validated using a real test bench showing good correlations between simulation and experimental tests.