El límite: una investigación performativa para el violonchelo contemporáneo

Este trabajo consiste en la realización de una investigación performativa sobre el concepto de límite. Dada mi condición de músico profesional este estudio pretende ser productivo en mi desarrollo como intérprete con el violonchelo, al tratar de hacer progresar mi capacidad interpretativa sobre todo en el ámbito de la expresión. Mi labor está basada en la interpretación de seis piezas para violonchelo solo, compuestas todas ellas a finales del siglo XX, desde el análisis y desarrollo de diferentes visiones de dicho concepto de límite. El proyecto propone diseñar y vivir una experiencia de conocimiento pensada como un experimento al servicio de un supuesto enriquecimiento de mis capacidades como intérprete. Este concepto de límite no sólo nos es útil desde el punto de vista de la creación y la interpretación musical, sino que además es una idea inherente al arte contemporáneo en general y presente además en todos los ámbitos del conocimiento. Así, el proyecto consiste en diseñar y vivir una experiencia de conocimiento pensada como un experimento al servicio de un supuesto enriquecimiento de mis capacidades como intérprete, aplicado sobre todo en el ámbito de la expresión. La idea originaria de realizar una tesis performativa desde la aplicación conceptual de la noción de límite ha exigido un estudio y análisis de las diferentes versiones que nos ofrece el concepto. Por otro lado, el intento de plasmar mi enriquecimiento musical en el plano de la expresión ha requerido una primera aproximación al estado de la cuestión de la expresión en el arte en general y en la música contemporánea en particular. Inevitablemente toda esta labor conlleva una carga de subjetividad inseparable de cualquier acto performativo, aún así, pretendo plasmar con la mayor objetividad posible todo el proceso en el presente trabajoGarcía Atienza, MT. (2015). El límite: una investigación performativa para el violonchelo contemporáneo [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/49619TESI

Characterization of dielectric charging in MEMS using Diffusive Representation

Postprint (author's final draft

Diffusive representation and sliding mode control of charge trapping in Al2O3MOS capacitors

© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising 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.The objective of this paper is to introduce a modeling strategy to characterize the dynamics of the charge trapped in the dielectric of MOS capacitors, using Diffusive Representation. Experimental corroboration is presented with MOS capacitors made of Alumina in three different scenarios. First, the model predictions are compared with the trapped charge evolution due to arbitrary voltage excitation. Second, the predictions are compared with the measurements of a device in which a sigma-delta control of trapped charge is implemented. Finally, the time evolution when the device is simultaneously controlled and irradiated with X-rays is compared with the predictions. In all cases, a good matching between the models and the measurements is obtained.Peer ReviewedPostprint (author's final draft

Time-varying thermal dynamics modeling of the prototype of the REMS wind sensor

The objective of this work is to show the results from the analysis of the thermal dynamics of a prototype of the REMS 3D wind anemometer using the tools of Diffusive Representation (DR). DR is a mathematical tool that allows the description of physical phenomena based on diffusion using state- space models of arbitrary order in the frequency domain. From open-loop experimental measurements, where a current signal with a wide frequency spectrum is injected in the heaters, time-varying dynamical thermal models are extracted for different wind velocities. This models provide the temperature evolution of the parts of the system under study as a function of the power delivered to the heat sources. The prototype of the wind sensor used in the experimental setup is based on thermal anemometry, which is the method that has been used in multiple occasions for the challenging task of wind sensing in Mars. It is based on the detection of the wind velocity by measuring the power dissipated of a heated element due to forced convection. This technique was employed in the wind sensor of REMS (Remote Environmental Monitor System) sensor suite, on board Curiosity rover since 2012. In 2018, it is expected to be launched the InSight (Interior Exploration using Seismic Investigation, Geodesy and Heat Transport) mission to Mars. It will include the TWINS instrument (Temperature and Wind sensors for InSight mission) which is an heritage from REMS. The prototype used in the experiments, is composed of three PCBs (Printed Circuit Board) placed on a cylindrical supporting structure (boom) at 120 ¿ from each other. Each PCB contains four Silicon dice set with Platinum resistors that are used as heating elements. The thermal dynamical characterization of one of the dice and its cross-heating with the boom is going to be presented.Postprint (published version

Thermal dynamics modeling of a 3D wind sensor based on hot thin film anemometry

The objective of this paper is to obtain time-varying models of the thermal dynamics of a 3D hot thin film anemometer for Mars atmosphere. To this effect, a proof of concept prototype of the REMS (Rover Environmental Monitoring Station) wind sensor on board the Curiosity rover has been used. The self and cross-heating effects of the thermal structures have been characterized from open-loop measurements using Diffusive Representation. These models have been proven to be suitable in the analysis of the thermal dynamics of the sensor under constant temperature operation employing the tools of Sliding Mode Controllers. This analysis allows to understand the long term heat diffusion processes in the whole structure and how they may affect the raw output signals.Postprint (author's final draft

Sliding mode analysis applied to improve the dynamical response of a spherical 3D wind sensor for Mars atmosphere

The objective of this paper is to show how the structure of a thermal wind anemometer can be tuned to ensure a fast response when the sensor works in closed loop configuration (constant temperature operation). If the thermal filter associated to the sensor structure has only one significative time constant, the resulting system time response, working in closed loop, is enhanced beyond the natural limit imposed by its own thermal circuit. This effect is theoretically explained using the theory of sliding mode controllers. Experimental corroboration is presented by comparing the results obtained with two prototypes of a spherical wind sensor for Mars atmosphere. It will be shown that in case of having only one significant time constant, the time response in closed loop is much faster than the value associated with that time constant. It will be experimentally shown that this effect is lost when the thermal filter has more than one significant time constant. Diffusive representation is used to obtain arbitrary-order models of the thermal structures of the sensors.Preprin

Testing campaign of a martian spherical wind sensor at the AWTSII Wind Tunnel Facility

The purpose of this paper is to present the experimental results obtained with a prototype of a 4-sector spherical anemometer, in the Aarhus Wind Tunnel Simulator II (AWTSII) reproducing Martian conditions. The main objective of the experimental campaign has been to measure wind velocity for a wide number of yaw and pitch angles, in an environment in the range of typical Mars conditions. The experimental results indicate that wind speed and angle recovery can be achieved with the proposed spherical sensor. The obtained responses are close to the empirical models found in the literature.Authors want to show their gratefulness to the Planetary Environment Facilities at Aarhus University (DK) for their hostage and professional approach. This laboratory is a member of Europlanet 2020 RI which has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 654208. This work was partially supported by the Spanish Ministry MINECO under Project grant no. ESP2016-79612-C3-2R.Peer ReviewedPostprint (published version

Cribado neonatal del deficit de biotinidasa

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Heat flow dynamics in thermal systems described by diffusive representation

The objective of this paper is to analyze the dynamics of heat flow in thermal structures working under constant temperature operation. This analysis is made using the tools of sliding mode controllers. The theory is developed considering that the thermal system can be described using diffusive representation. The experimental corroboration has been made with a prototype of a wind sensor for Mars atmosphere being controlled by a thermal sigma-delta modulator. This sensor structure allows to analyze experimentally the time-varying case since changes in wind conditions imply changes in the corresponding thermal models. The diffusive symbols of the experimental structures have been obtained from openloop measurements in which pseudo-random binary sequences of heat are injected in the sensor. With the proposed approach it is possible to predict heat flux transient waveforms in systems described by any arbitrary number of poles. This allows for the first time the analysis of lumped and distributed systems without any limitation on the number of poles describing it.Peer ReviewedPostprint (author's final draft

Self-calibrating closed-loop circuit for configurable constant voltage thermal anemometers

A new circuit is described which applies a configurable voltage across an RTD while the current flowing through it is measured with a current mirror. The circuit also allows working with voltages above the IC supply voltage to cope with the high power RTD dissipation normally required in thermal anemometers. The circuit is periodically calibrated to cancel the errors and amplifier offset and therefore improves measurement accuracy. Experimental measurements of the circuit fabricated using 0.35 mu m AMS technology show the functionality and improved power efficiency.Postprint (published version