A memoria da desmemoria.

Sin resume

Time to land prediction in Barcelona-El Prat airport based on machine learning classification models

This document contains a method to assess the landing time in Barcelona-El Prat airport using machine learning classification models. The goal of this project is not to predict a continuous variable but if the time to land falls inside one of the following categories: advanced, delayed or planned. Additionally, two categories called very advanced and very delayed have been included containing flights that have had abnormal values on their time to land, either because of very fast approaches or very slow ones. To obtain the data, an ADS-B antenna located on the aerospace and telecommunications engineering school of Castelldefels rooftop has been used. This antenna, captures the signals of all the arrivals into Barcelona which are later decoded thanks to an already existing program written in C#. By means of a custom program written in python, the most relevant characteristics of these flights are extracted and presented in a matrix format so that the different models can understand them. All the data has been scaled and divided in training and test samples. The first ones are used to teach the different models and the second ones are used to measure their efficiency. Six different models have been trained, four of them reached accuracy values over 60%, another one reached a value of 75% and another one could not go over 30%. The best three models, have been adjusted with two different techniques: random search and grid search. It has been verified that a random search is significantly better since the same results can be obtained but it requires much less time and computing resources. Also, different methods to enhance the results of the already adjusted models such as voting classifiers and boosters have been used. Finally, oversampling techniques have been implemented to solve the five categories problem as the extreme cases are very underrepresented. Thanks to this technique, the accuracy of these two categories was improved but in turn the overall accuracy descended. The performance of these models could be upgraded in the future if more flights or more characteristics of those flights were added

De la voluntad de pronunciar una nube. "Fortini / Cani" como paradigma de la cita

Per Jean-Marie Straub e Danièle Huillet l'immagine e il suono cinematografico sorgono a partire da un essenziale rapporto dialettico, sobrio e chiarificatore, al quale non rinunciano mai. Altrettanto dialettica, nella loro messa in scena, è la netta disgiunzione che separa una parola ‘citata' e il luogo in cui essa viene evocata, permettendo di conservare in modo autentico la natura originale dell'opera di volta in volta adottata. Questo reimpiego di un testo verbale, molto diverso dalle tecniche con cui solitamente l'industria cinematografica adatta (deformandola e fagocitandola) la letteratura, è qui studiato a partire dal fondamentale film del 1976 Fortini / Cani.Jean-Marie Straub and Danièle Huillet argue that the cinematic image and sound spring from a sober and clarifying, as well as essentially dialectal and inevitable, relationship. In their representation on screen, the clear-cut disjunction between a ‘quoted' word and the place in which it is evoked appears to be equally dialectical, thus allowing for an authentic preservation of the original nature of the different works being adapted. This form of re-use of a verbal text is in complete contrast to the techniques habitually employed by the cinema industry to adapt literature through its deformation and absorption, and is here discussed by way of the essential 1976 film Fortini / Cani

Sound Art and the Ecosophical Object: Some Aesthetico-Ontological Remarks on Machinic Productivity

Confrontadas al problema del caos y el significado en el contexto de la producción de subjetividad, el arte sonoro surge una y otra vez como un espacio privilegiado para la reordenación y producción de nuevas consistencias subjetivas. Frente a los procesos de creciente homogeneización subjetiva del capitalismo tardío, la imaginación sonora, en el centro de una tensión ontológica entre la disolución del sentido y su redundancia estructural y fantasmática, nos permite seguir “removiendo el fondo”. Así, hemos tratado de explorar el arte sonoro como una enunciación colectiva, como una forma de exceso que va mucho más allá del ámbito humano y hacia el plano maquínico de consistencia, y lo hemos hecho a través del prisma de las semióticas a-significantes. La conclusión a la que hemos llegado es la de la necesidad de una comprensión maquínica, transespecie, no-humanista del arte sonoro y su ensamblaje colectivo.When confronted with the problem of chaos and meaning in the context of the production of subjectivity, sound art emerges time and again as a privileged space for the rearrangement and production of new subjective consistencies. Faced with the processes of increasing subjective homogenization of late capitalism, the sonic imagination, in the centre of an ontological tension between the dissolution of meaning and its structural and phantasmatic redundancy, allows us to carry on “turning over the ground”. We have thus tried to explore sound art as collective enunciation, as a form of excess that goes well beyond the human realm and into the machinic plane of consistency, and we have done this through the prism of a-signifying semiotics. The conclusion we have reached is that of the need for a non-humanist, trans-species, machinic comprehension of sound art and its collective assemblage.Confrontadas al problema del caos y el significado en el contexto de la producción de subjetividad, el arte sonoro surge una y otra vez como un espacio privilegiado para la reordenación y producción de nuevas consistencias subjetivas. Frente a los procesos de creciente homogeneización subjetiva del capitalismo tardío, la imaginación sonora, en el centro de una tensión ontológica entre la disolución del sentido y su redundancia estructural y fantasmática, nos permite seguir “removiendo el fondo”. Así, hemos tratado de explorar el arte sonoro como una enunciación colectiva, como una forma de exceso que va mucho más allá del ámbito humano y hacia el plano maquínico de consistencia, y lo hemos hecho a través del prisma de las semióticas a-significantes. La conclusión a la que hemos llegado es la de la necesidad de una comprensión maquínica, transespecie, no-humanista del arte sonoro y su ensamblaje colectivo

Structural Studies on Flexible Small Molecules Based on NMR in Oriented Media. Methodology and Application to Natural Products

This thesis describes the development and application of structural elucidation methodologies based on NMR in aligned media. Nuclear magnetic resonance is arguably the most important technique for the structural analysis of organic molecules in solution. In the last decade, Residual Dipolar Coupling (RDC) analysis emerged as a powerful tool for the determination of the three-dimensional structure of organic molecules in solution, complementing and even outperforming the approach based on the classical NMR observables such as NOE or 3J couplings. While application of RDCs to the structural analysis of proteins developed rapidly, their use with “small” molecules (typically organic compounds and natural products with MW < 1000 Da) is still scarce. From the spectroscopic point of view, two features of small molecules pose the main obstacles to the application of RDC to their analysis: the scarcity of observable couplings and the complexity stemming from conformational flexibility in solution. Besides, sample preparation with the optimal degree of alignment is still an issue for most classes of compounds. In this thesis, all these topics are addressed and new experimental and computational advancements are presented. i) Sample preparation. Weak alignment in water and aligning properties of polyacrylamide gels. ii) New observables. Long-range proton–carbon RDCs. iii) Analysis of flexible organic molecules

Experimental measurement of endocytosis in fungal hyphae.

The present study examines the notion that polarized exocytosis in the tips of growing hyphae creates an excess of plasma membrane and thus the need for its removal by endocytosis. To measure endocytosis experimentally, we developed a photobleaching (FRAP) procedure to count endocytic events in hyphae of Neurospora crassa carrying a fluorescent tag on the actin-binding protein fimbrin (FIM-1-GFP). Given 40 nm as the average diameter of endocytic vesicles, we calculated that about 12.5% of the plasma membrane discharged in the apex becomes endocytosed in the subapex. According to our calculations, the GFP-tagged hyphae of N. crassa, measured under the constrained conditions of confocal microscopic examination, needed about 8800 vesicles/min to extend their plasma membrane or about 9800/min, if we include predicted demands for cell wall growth and extracellular secretion. Our findings support the notion that exocytosis and endocytosis operate in tandem with the latter serving as a compensatory process to remove any excess of plasma membrane generated by the intense exocytosis in the hyphal tips. Presumably, this tandem arrangement evolved to support the hallmark features of fungi namely rapid cell extension and abundant secretion of hydrolytic enzymes