Analysis of circuit imperfections in BosonSampling

BosonSampling is a problem where a quantum computer offers a provable speedup over classical computers. Its main feature is that it can be solved with current linear optics technology, without the need for a full quantum computer. In this work, we investigate whether an experimentally realistic BosonSampler can really solve BosonSampling without any fault-tolerance mechanism. More precisely, we study how the unavoidable errors linked to an imperfect calibration of the optical elements affect the final result of the computation. We show that the fidelity of each optical element must be at least $1 - O(1/n^2)$, where $n$ refers to the number of single photons in the scheme. Such a requirement seems to be achievable with state-of-the-art equipment.Comment: 20 pages, 7 figures, v2: new title, to appear in QI

Fishing Technology and Optimal Distribution of Harvest Rates

In this paper we analyze the optimal management of a joint ownership fishery exploitation model where agents use different fishing gears. As opposed to other works, we consider a model in which the fishing technology affects resource's growth not only through the harvest function, but also through the natural growth rate of the resource. The main objective is to capture the evidence that some fishing gears alter the habitat of the resource, and may alter the natural growth rate of the resource. The main result we obtain is that, when the natural growth of the resource is altered by the fishing technology, the optimal stock is not independent of how harvest quotas are distributed among the agents. Thus, in this context, a fishing policy that determines, first, the optimum stock and, secondly, decides on how to distribute the harvest among the different agents will not be efficient.fisheries regulation, fishing gear's selectivity, sharing of quotas

Developing of the smart textile for energy expenditure monitoring

Peer ReviewedPostprint (published version

La biblioteca de La Tercera Fundación

Conferencias y Comunicaciones del primer Congreso Internacional de literatura fantástica y ciencia ficción, celebrado del 6 al 9 de mayo de 2008 en la Universidad Carlos III de Madri

La memoria proyectante: el dibujo en el proceso creativo de Álvaro Siza.

[EN] The article analyzes the role that drawing plays in the creative process of a renowned architect such as Álvaro Siza, from the most initial phase of context analysis to specific detail aspects such as the analysis of light inside a given space, supported by conversations with the architect himself and with Eduardo Souto de Moura.[ES] El artículo analiza el papel que juega el dibujo en el proceso creativo de un arquitecto de referencia como es Álvaro Siza, desde la fase más inicial de análisis del contexto hasta aspectos de detalle concretos como el análisis de la luz en el interior de un espacio, apoyado en conversaciones con el propio arquitecto y con Eduardo Souto de Moura.García García, R. (2020). The projecting memory: the drawing in the creative process of Álvaro Siza. EGA Expresión Gráfica Arquitectónica. 25(38):160-169. https://doi.org/10.4995/ega.2020.11181OJS1601692538Barros, Hugo.: El dibujo de Álvaro Siza: Pequeña Historia. EGA Expresión Gráfica Arquitectónica, Vol. 14. 2009. https://doi.org/10.4995/ega.2009.10253Higinio Pereira Teixeira da Cunha, Nuno: Los dibujos de Álvaro Siza: Anotaciones al Margen. Tesis Doctoral. U. Complutense de Madrid. 2007.Llano, P. y Castanheira , C.: Álvaro Siza, Obras e projectos. 1990.Rodríguez, J. y Seoane, C.: Siza x Siza. Colección Arquia/temas de Fundación Arquia. 2015.Siza, Álvaro. Fragmentos de una experiencia, conversaciones con Carlos Castanheira, Pedro de Llano, Francisco Rei y Santiago Seara. Ed. Electa. 2005

Determinació de la vida útil de bolets comestibles amb proves accelerades i anàlisi multivariant

Treballs Finals de Grau de Química, Facultat de Química, Universitat de Barcelona, Any: 2023,Tutors: Anna de Juan Capdevila, Stefan Yordanov PlatikanovThis project deals with the determination of the shelf-life of Agaricus bisporus, one of the most widely consumed mushrooms in the world. By storing these mushrooms at 5, 15 and 25 ºC, the effects of temperature were studied with 4 parameters: weight loss rate, ATR-FTIR spectrum PCA scores, green color change PCA scores and dark to white pixel ratio. These variables were measured over the span of 15 days to apply Accelerated Shelf-Life Testing (ASLT) and Multivariate Accelerated Shelf-Life Testing (MASLT) methodologies in order to estimate the kinetic parameters of the degradation reactions. ASLT yielded a shelf life of 10.88-12.09 days at 5 ºC, 4.13-8.53 days at 15 ºC and 4.51-4.52 days at 25 ºC and a global energy of activation of 30.6-34.6 kJ/mol. Univariate results were inconclusive and could not be calculated for the image related parameters, as they do not follow a discernible kinetic pattern. MASLT yielded a shelf life of 12.6 days at 5 ºC, 4.1 days at 15 ºC and 3.4 days at 25 ºC, with an energy of activation of 56.7 kJ/mol. This method based on PCA did allow the images’ information to be used, thus proved a more effective tool to transform parameters with non-linear kinetic pattern into useful usable information. Further research is needed, but it is a promising line of investigation that can be applied to other substance

Reflections of Le Corbusier on the work of Álvaro Siza

This research article navigates through the different common lines seen between the life and work of two of the most relevant architects of the 20th century: Le Corbusier and Álvaro Siza. Though belonging to different times, they both constitute indisputable examples of the architecture of their times, where several aspects in common appear, inviting us to think about the unconscious influence of the Swiss master on the work of the Portuguese architect over the years.Este artigo de pesquisa propõe um percurso através das diversas linhas comuns encontradas na vida e obra de dois dos arquitetos mais relevantes do século XX: Le Corbusier e Álvaro Siza. Embora tenham vivido em épocas diferentes, ambos são referentes indiscutíveis da arquitetura de seu tempo. Entre eles podem-se contatar inúmeros pontos em comum, os quais nos convidam a suspeitar de uma influência inconsciente do professor suíço no arquiteto português ao longo dos anos.El presente artículo de investigación plantea un recorrido por las diferentes líneas comunes advertidas entre la vida y la obra de dos de los arquitectos más relevantes del siglo XX: Le Corbusier y Álvaro Siza. Aunque pertenecientes a diferentes épocas, ambos constituyen indiscutidos referentes de la arquitectura de su tiempo en los que asoman numerosos aspectos en común que invitan a pensar en una influencia inconsciente del maestro suizo sobre el trabajo que el portugués desarrolló a lo largo de los años

Evaluation of flight efficiency for Stockholm Arlanda Airport using OpenSky Network data

Identification of causes of the delays within transition airspace is an important step in evaluating performance of the Terminal Maneuvering Area (TMA) Air Navigation Services: without knowing the current performance levels, it is difficult to identify which areas could be improved. Inefficient vertical profiles within TMA and deviations from the optimal flight paths due to bad weather conditions are the main sources of performance decline. In this work, we analyse punctuality and vertical efficiency of Stockholm Arlanda airport arrivals, and seek to quantify the fuel consumption impact associated with the inefficient vertical flight profiles within the Terminal Maneuvering Area (TMA). We use Opensky Network data for evaluation of the Stockholm Arlanda airport performance, comparing it to the DDR2 data provided by Eurocontol, outlining the advantages and disadvantages of both.Peer ReviewedPostprint (author's final draft

Planning hand-arm grasping motions with human-like appearance

© 2018 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 worksFinalista de l’IROS Best Application Paper Award a la 2018 IEEE/RSJ International Conference on Intelligent Robots and Systems, ICROS.This paper addresses the problem of obtaining human-like motions on hand-arm robotic systems performing pick-and-place actions. The focus is set on the coordinated movements of the robotic arm and the anthropomorphic mechanical hand, with which the arm is equipped. For this, human movements performing different grasps are captured and mapped to the robot in order to compute the human hand synergies. These synergies are used to reduce the complexity of the planning phase by reducing the dimension of the search space. In addition, the paper proposes a sampling-based planner, which guides the motion planning ollowing the synergies. The introduced approach is tested in an application example and thoroughly compared with other state-of-the-art planning algorithms, obtaining better results.Peer ReviewedAward-winningPostprint (author's final draft

Conditional t-SNE: Complementary t-SNE embeddings through factoring out prior information

Dimensionality reduction and manifold learning methods such as t-Distributed Stochastic Neighbor Embedding (t-SNE) are routinely used to map high-dimensional data into a 2-dimensional space to visualize and explore the data. However, two dimensions are typically insufficient to capture all structure in the data, the salient structure is often already known, and it is not obvious how to extract the remaining information in a similarly effective manner. To fill this gap, we introduce \emph{conditional t-SNE} (ct-SNE), a generalization of t-SNE that discounts prior information from the embedding in the form of labels. To achieve this, we propose a conditioned version of the t-SNE objective, obtaining a single, integrated, and elegant method. ct-SNE has one extra parameter over t-SNE; we investigate its effects and show how to efficiently optimize the objective. Factoring out prior knowledge allows complementary structure to be captured in the embedding, providing new insights. Qualitative and quantitative empirical results on synthetic and (large) real data show ct-SNE is effective and achieves its goal