Micro air vehicles energy transportation for a wireless power transfer system

The aim of this work is to demonstrate the feasibility use of an Micro air vehicles (MAV) in order to power wirelessly an electric system, for example, a sensor network, using low-cost and open-source elements. To achieve this objective, an inductive system has been modelled and validated to power wirelessly a sensor node using a Crazyflie 2.0 as MAV. The design of the inductive system must be small and light enough to fulfil the requirements of the Crazyflie. An inductive model based on two resonant coils is presented. Several coils are defined to be tested using the most suitable resonant configuration. Measurements are performed to validate the model and to select the most suitable coil. While attempting to minimize the weight at transmitter’s side, on the receiver side it is intended to efficiently acquire and manage the power obtained from the transmitter. In order to prove its feasibility, a temperature sensor node is used as demonstrator. The experiment results show successfully energy transportation by MAV, and wireless power transfer for the resonant configuration, being able to completely charge the node battery and to power the temperature sensor.Peer ReviewedPostprint (published version

Sobolev orthogonal polynomials in the complex plane

12 pages, no figures.-- MSC2000 codes: 42C05, 33C45.MR#: MR1808575 (2001j:30006)Zbl#: Zbl 0973.42015Sobolev orthogonal polynomials with respect to measures supported on compact subsets of the complex plane are considered. For a wide class of such Sobolev orthogonal polynomials, it is proved that their zeros are contained in a compact subset of the complex plane and their asymptotic-zero distribution is studied. We also find the nth-root asymptotic behavior of the corresponding sequence of Sobolev orthogonal polynomials.The research of the first author (G.L.L.) was partially supported by Dirección General de Enseñanza Superior under grant PB 96-0120-C03-01 and by INTAS under grant 93-0219 EXT.Publicad

Asymptotic of extremal polynomials in the complex plane

12 pages, no figures.-- MSC2000 codes: 30E15, 41A60.Zbl#: Zbl 1084.30043We study the zero location and asymptotic zero distribution of sequences of polynomials which satisfy an extremal condition with respect to a norm given on the space of all polynomials.The work of G. López and H. Pijeira was supported by Dirección General de Investigación, Ministerio de Ciencia y Tecnología of Spain under grant BFM 2003–06335–C03–02. G. López also received partial support from NATO PST.CLG.979738 and INTAS 03-51-6637.Publicad

Strong asymptotics for Sobolev orthogonal polynomials in the complex plane

15 pages, no figures.-- MSC2000 codes: 42C05, 33C25.MR#: MR2376173Zbl#: Zbl 1154.33303^aWe obtain the strong asymptotics for the sequence of monic polynomials minimizing the norm $$\Vert q_S\Vert=(\sum_{k=0}^N \Vert q^{(k)}\Vert_k^2)^{1/2}$$ where $\Vert \bullet\Vert_k$, $k=0,\dots, N-1$, are $L^2$ norms with respect to measures supported on the same rectifiable Jordan closed curve on $\Gamma$, and $\Vert \bullet\Vert_N$ is the $L^2$ norm corresponding to a weight supported or arc $\Gamma$, which satisfies the Szegö condition, plus mass points in the unbounded connected component of \bbfC\setminus \Gamma.First author's research partially supported by Ministerio de Ciencia y Tecnología, grant MTM2006-13000-C03-02 and by Comunidad de Madrid-Universidad Carlos III de Madrid, grant CCG06-UC3M/EST-0690. Second author's research partially supported by Ministerio de Ciencia y Tenología, project code MTM2005-09648-C02-01 and by Junta de Andalucía, FQM-229, FQM-481 and P06-FQM-01738. Fourth author's research partially supported by a research grant from Centro de Investigación Matemática de Canarias (CIMAC), Spain.Publicad

Mapas de distribución de algas marinas de la Península Ibérica e Islas Baleares. XVII. Laminaria rodriguezii Bornet y adiciones a los mapas de L. hyperborea (Gunner.) Foslie, L. ochroleuca Bach. Pyl. y L. saccharina (L.) Lamour. (Laminariales, Fucophyceae

Se presenta el mapa de distribución en la Península Ibérica e Islas Baleares, de Laminaria rodriguezii Bornet perteneciente al orden Laminariales. Se incluyen también adiciones a los mapas de distribución de L. hyperborea (Gunner.) Foslie, L. ochroleuca Bach. Pyl. y L. saccharina (L.) Lamour. publicados por Izquierdo et al. (1993) incorporando los mapas completos

Effects of Minimalist Footwear and Foot Strike Patterns on Plantar Pressure during a Prolonged Running

The use of minimalist shoes (MS) in running involves changes in running mechanics com pared to conventional shoes (CS), but there is still little research analysing the effects of this footwear on plantar pressure, which could help to understand some risk injury factors. Moreover, there are no studies examining the effects of a prolonged running and foot strike patterns on baropodometric variables in MS. Therefore, the aim of this study was to analyse the changes produced using MS on plantar pressure during a prolonged running, as well as its interaction with the time and foot strike pattern. Twenty-one experienced minimalist runners (age 38 ± 10 years, MS running experience 2 ± 1 years) ran with MS and CS for 30 min at 80% of their maximal aerobic speed, and mean pres sure, peak pressure, contact time, centre of pressure velocity, relative force and contact area were analysed using a pressure platform. Foot strike pattern and time were also considered as factors. The multivariable linear regression mixed models showed that the use of MS induced, at the end of a prolonged running, higher peak pressure (p = 0.008), lower contact time (p = 0.004) and lower contact area (p < 0.001) than using CS. Also, runners with forefoot strike pattern using MS, compared to midfoot and rearfoot patterns, showed higher mean and peak pressure (p < 0.001) and lower contact time and area (p < 0.05). These results should be considered when planning training for runners using MS, as higher peak pressure values when using this type of footwear could be a risk factor for the development of some foot injuries

Influencia de la interacción océano atmósfera en la simulación del clima de la Península Ibérica: un estudio con un modelo regional acoplado

Ponencia presentada en: IX Congreso de la Asociación Española de Climatología celebrado en Almería entre el 28 y el 30 de octubre de 2014.[ES]El objetivo es evaluar la relevancia de la interacción atmósfera océano en el clima de la Península Ibérica mediante el análisis de simulaciones con el modelo acoplado ROM. La componente atmosférica de ROM es el modelo regional REMO y la componente oceánica es el modelo MPI-OM. El modelo incluye un módulo dedicado a la simulación de los caudales de los ríos. Las componentes de ROM intercambian información a través del acoplador OASIS.[EN]We study the impact of ocean-atmosphere interaction on the Iberian Peninsula climate with the regionally coupled model ROM. The atmospheric component of ROM is the Regional Atmospheric Model REMO and the oceanic component is MPI-OM. ROM also comprises the hydrogical model HD. These components exchange information through the OASIS coupler

Structure and Dynamics of Large-Scale Cognitive Networks in Huntington's Disease

Altres ajuts: La Marató de TV3 (20142910).Background: Huntington's disease is a neurodegenerative disorder characterized by clinical alterations in the motor, behavioral, and cognitive domains. However, the structure and disruptions to large-scale brain cognitive networks have not yet been established. Objective: We aimed to profile changes in large-scale cognitive networks in premanifest and symptomatic patients with Huntington's disease. Methods: We prospectively recruited premanifest and symptomatic Huntington's disease mutation carriers as well as healthy controls. Clinical and sociodemographic data were obtained from all participants, and resting-state functional connectivity data, using both time-averaged and dynamic functional connectivity, was acquired from whole-brain and cognitively oriented brain parcellations. Results: A total of 64 gene mutation carriers and 23 healthy controls were included; 21 patients with Huntington's disease were classified as premanifest and 43 as symptomatic Huntington's disease. Compared with healthy controls, patients with Huntington's disease showed decreased network connectivity within the posterior hubs of the default-mode network and the medial prefrontal cortex, changes that correlated with cognitive (t = 2.25, P = 0.01) and disease burden scores (t = −2.42, P = 0.009). The salience network showed decreased functional connectivity between insular and supramarginal cortices and also correlated with cognitive (t = 2.11, P = 0.02) and disease burden scores (t = −2.35, P = 0.01). Dynamic analyses showed that network variability was decreased for default-central executive networks, a feature already present in premanifest mutation carriers (dynamic factor 8, P = 0.02). Conclusions: Huntington's disease shows an early and widespread disruption of large-scale cognitive networks. Importantly, these changes are related to cognitive and disease burden scores, and novel dynamic functional analyses uncovered subtler network changes even in the premanifest stages

Effects of ITO based back contacts on Cu(In,Ga)Se2 thin films, solar cells, and mini-modules relevant for semi-transparent building integrated photovoltaics

This study presents the results of the development of semi-transparent Cu(In,Ga)Se2 (CIGSe) mini-modules for the application in building integrated photovoltaics (BIPV). Applying in-situ X-ray diffraction in real-time during CIGSe growth we find that the bulk of indium-tin-oxide (ITO), acting as the transparent back contact, is chemically stable in CIGSe processing. CIGSe layers grown on reactively sputtered ITO (Ar/O2 flux ratio = 60:1) or on ITO annealed in ambient air have a pro-portionally higher (220/204) orientation compared to CIGSe layers grown on as fabricated ITO sputtered solely by Ar. However, independent from the fabrication and annealing state of the ITO back contact, after CIGSe deposition at high substrate temperatures >= 600 degrees C accumulation of Ga at the CIGSe/ITO back contact interface combined with reduced solar cell efficiency is observed. This Ga accumulation visible in elemental depth profiles is attributed to the formation of gallium -oxide (GaOx). Applying a very thin (approximate to 10-30 nm) functional molybdenum layer in between CIGSe and the ITO back contact inhibits the formation of GaOx. Based on this Mo/ITO back contact configuration semi-transparent 10 x 10 cm2 mini-modules with 14 cells interconnected in series have been fabricated. Module parameters resulted in a fill factor of 63% and >12% in efficiency. The solar active coverage of the modules amounts to approximate to 70%, and the average visible transmittance (in the range 380-780 nm) of the transparent sections was 27.6% (9.6% for the total area of the device). Optimisation of the Mo/ITO contact allows increasing this transparency to values > 50%. Long-term outdoor testing of a semi-transparent module prototype reveals no degradation in electric output power for 3 months, demonstrating the device stability under changing climatic conditions