Inductive Sensor for measuring partial discharges in electrical machines

The research group 'Diagnosis of Electrical Machines and Insulation Materials (DIAMAT) of the University Carlos III of Madrid, has developed an inductive sensor that can detect and measure partial discharge that are characteristic in electrical machines (its analysis allows to estimate the aging degree of the internal insulation)

Nueva generación de bloqueantes del intercambiador Na+/Ca2+ mitocondrial inspirados en CGP37157: Síntesis y neuroprotección

Tesis doctoral inédita leída en la Universidad Autónoma de Madrid, Facultad de Medicina, Departamento de Farmacología. Fecha de lectura: 10-07-201

CFD modelling of the interaction between the Surface Boundary Layer and rotor wake. Comparison of results obtained with different turbulence models and mesh strategies

A simplified CFD wake model based on the actuator disk concept is used to simulate the wind turbine, represented by a disk upon which a distribution of forces, defined as axial momentum sources, are applied on the incoming non-uniform flow. The rotor is supposed to be uniformly loaded, with the exerted forces function of the incident wind speed, the thrust coefficient and the rotor diameter. The model is tested under different parameterizations of turbulence models and validated through experimental measurements downwind of a wind turbine in terms of wind speed deficit and turbulence intensity

Validation of a CFD wake model based on the actuator disk technique and the thrust coefficient. Preliminary results

A simplified CFD wake model based on the actuator-disk concept is used to simulate the wind turbine, represented by an actuator disk upon which a distribution of forces, defined as axial momentum sources, are applied on the incoming flow. The rotor is supposed to be uniformly loaded, with the exerted forces as a function of the incident wind speed, the thrust coefficient and the rotor diameter. The model is validated through experimental measurements downwind of a wind turbine in terms of wind speed deficit. Validation on turbulence intensity will also be made in the near future

Grupos de Galois Profinitos

El presente trabajo sobre Teoría de Galois se aleja de la cuestión de la resolubilidad por radicales de los polinomios de grado mayor o igual que cinco para estudiar el Grupo de Galois sobre extensiones de Galois que pueden ser infinitas. Se utilizarán resultados del caso de las extensiones finitas y comprobaremos que existe, con alguna salvedad, una versión del Teorema Fundamental de la Teoría de Galois ya generalizada a extensiones de cuerpos de grado infinito. Será necesario definir una topología, la Topología de Krull, sobre dichos Grupos de Galois, y estudiar las propiedades topológicas que aparecen en ellos, así como sus consecuencias, con el fin de contar con la herramienta de la Topología para el cumplimiento del objetivo de este trabajo. Este será, a grandes rasgos, identificar una clase de grupos topológicos, los grupos profinitos, con los Grupos de Galois sobre una cierta extensión.<br /

Sensitivity analysis on turbulence models for the ABL in complex terrain

Análisis de sensibilidad de modelos de turbulencia para un modelo CFD de viento aplicados a un emplazamiento en terreno complejo. Validación con datos de viento y turbulencia registrados a 3 alturas en 3 torres de medida

Sensor inductivo para la medida de descargas parciales en máquinas eléctricas

El grupo de investigación “Diagnóstico de Máquinas Eléctricas y Materiales Aislantes (DIAMAT)” de la Universidad Carlos III de Madrid, ha desarrollado un sensor inductivo que permite detectar y medir las descargas parciales características en máquinas eléctricas (cuyo análisis permite estimar el grado de envejecimiento del aislamiento interno)

Frequency domain modelling of random wound motor windings for insulation stress analysis

The use of conventional low voltage induction motors fed by pulse width modulated (PWM) inverters has begun to present important problems. These waveforms consist of steep-fronted pulses having very short rise times (about 100 ns in modern IGBT bridges) and high frequency repetition rates (up to 20 kHz) whose immediate consequences are additional electrical stresses in an induction motorrsquos insulation system. In this paper a frequency domain model for the analysis and characterization of the internal voltage distribution in random wound coils is presented. The model allows voltage prediction in time domain when an inverse fast Fourier transform (FFT) transformation is performed, and requires only a few frequency domain impedance measurements. This methodology will be useful for accurately predicting the voltage distribution in motor windings during the design stage, and reducing the risk of premature failure in motor insulation. Experimental and theoretical results are presented and compared and model effectiveness using different approximations is studied.This research has been suported by the Spanish Science and Technology Ministry under contract MAT 2002 03210, and the Madrid Regional Government under the Initiative for Regional R&D Laboratoy Network

Parameterization of the atmospheric boundary layer for offshore wind resource assessment with a limited length-scale k-ε model

The structure of the atmospheric boundary layer (ABL) is modelled with the limited- length-scale k-ε model of Apsley and Castro. Contrary to the standard k-ε model, the limited-length-scale k-ε model imposes a maximum mixing length which is derived from the boundary layer height, for neutral and unstable atmospheric situations, or by Monin-Obukhov length when the atmosphere is stably stratified. The model is first verified reproducing the famous Leipzig wind profile. Then the performance of the model is tested with measurements from FINO-1 platform using sonic anemometers to derive the appropriate maximum mixing length

Refinando el análisis de estabilidad y cinético del desplegamiento de proteínas a partir de simulaciones de dinámica molecular

In the present study, a method for detecting protein unfolding events and evaluating protein stability and kinetics from relaxation Molecular Dynamics (rMD) simulations has been fine tuned. In particular, a 2D root mean square deviation (RMSD)-based clustering was performed on trajectories generated by rMD simulations for the protein α3D under a broad range of temperatures and two different force fields: CHARMM27 and AMBER99SB-disp. The half-life of unfolding was measured from the clustering plots and its value was used to compute the conformational stability of the protein extrapolated at 298 K by means of an empirical model previously developed by the research group. Ladder- and ramp-based temperature scanning simulations were also explored to assess the optimum simulation approach in terms of computational resources, accuracy, and adequacy for the kind of protein stability and unfolding kinetics analyses here envisioned. Furthermore, the performance (accuracy and reliability) of the above-mentioned force fields was assessed in estimating protein stability.<br /