Enhancing the Expressivity of Variational Neural, and Hardware-Efficient Quantum States Through Orbital Rotations

Variational approaches, such as variational Monte Carlo (VMC) or the variational quantum eigensolver (VQE), are powerful techniques to tackle the ground-state many-electron problem. Often, the family of variational states is not invariant under the reparametrization of the Hamiltonian by single-particle basis transformations. As a consequence, the representability of the ground-state wave function by the variational ansatz strongly dependents on the choice of the single-particle basis. In this manuscript we study the joint optimization of the single-particle basis, together with the variational state in the VMC (with neural quantum states) and VQE (with hardware-efficient circuits) approaches. We show that the joint optimization of the single-particle basis with the variational state parameters yields significant improvements in the expressive power and optimization landscape in a variety of chemistry and condensed matter systems. We also realize the first active-space calculation using neural quantum states, where the single-particle basis transformations are applied to all of the orbitals in the basis set

Stress vs sputtering effects in the propagation of surface ripples produced by ion-beam sputtering

The proceeding at: 19th International Conference on Ion Beam Modification of Materials (IBMM 2014). Took place at 2014, September, 14-19, in Bruges (Belgium). The event Web Site in https://iks32.fys.kuleuven.be/indico/event/16/Under low energy ion irradiation, periodic features (ripples) can develop on the surfaces of semiconductor materials, with typical sizes in the nanometric range. Recently, a theory of pattern formation has been able to account for the variability with the ion/target combination of the critical angle value separating conditions on ion incidence that induce the presence or the absence of ripples. Such a theory is based in the accumulation of stress in the damaged irradiated layer and its relaxation via surface-confined viscous flow. Here we explore the role of stress, and its competition with purely erosive mechanisms, to deter-mine the sign of the velocity with which the ripple pattern moves across the target plane. Based on this theory, we discuss different situations and make specific testable predictions for the change of sign in that velocity.Our work has been funded through MINECO (Spain) grants FIS2012-38866-C05-01, FIS2012-32349, and FIS2013-47949-C2-2. A.M.-B. acknowledges support from MINECO, through FPI scholarship BES-2010-036179.Publicad

Efficient Floating-Point Representation for Balanced Codes for FPGA Devices

Trabajo premiado con Best paper AwardWe propose a floating–point representation to deal efficiently with arithmetic operations in codes with a balanced number of additions and multiplications for FPGA devices. The variable shift operation is very slow in these devices. We propose a format that reduces the variable shifter penalty. It is based on a radix–64 representation such that the number of the possible shifts is considerably reduced. Thus, the execution time of the floating–point addition is highly optimized when it is performed in an FPGA device, which compensates for the multiplication penalty when a high radix is used, as experimental results have shown. Consequently, the main problem of previous specific highradix FPGA designs (no speedup for codes with a balanced number of multiplications and additions) is overcome with our proposal. The inherent architecture supporting the new format works with greater bit precision than the corresponding single precision (SP) IEEE–754 standard.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. IEEE, IEEE Computer Societ

Federated identity architecture of the european eID system

Federated identity management is a method that facilitates management of identity processes and policies among the collaborating entities without a centralized control. Nowadays, there are many federated identity solutions, however, most of them covers different aspects of the identification problem, solving in some cases specific problems. Thus, none of these initiatives has consolidated as a unique solution and surely it will remain like that in a near future. To assist users choosing a possible solution, we analyze different federated identify approaches, showing main features, and making a comparative study among them. The former problem is even worst when multiple organizations or countries already have legacy eID systems, as it is the case of Europe. In this paper, we also present the European eID solution, a purely federated identity system that aims to serve almost 500 million people and that could be extended in midterm also to eID companies. The system is now being deployed at the EU level and we present the basic architecture and evaluate its performance and scalability, showing that the solution is feasible from the point of view of performance while keeping security constrains in mind. The results show a good performance of the solution in local, organizational, and remote environments

Gamificación y e-learning: estudio de un contexto universitario para la adecuación de su diseño

Gamification, applied to educational contexts, can increase the motivation and engagement of stu­dents. First analysis of the bibliography tells that there is not enough research done in this topic, and there are few guidelines marked to implement gamification. This work aims to generate hypothe­ses that guide the design of a future pilot study in e-learning high education. Students and teachers from the Master of Education and New Technolo­gies at the Madrid Open University (UDIMA) have been tested. The methodology includes qualitative and quantitative aspects and two different on-line questionnaires. Student’s questionnaire included a translation of the BrainHex test. Conclusions about the gamification characteristics which are more suitable in this e-learning high education context are generated using these results and through a review of existing research: related to the accep­tance of gamification by students and teachers; related to the type of gamification elements that are more suitable for use in the context at the UDIMA and related to aspects or behaviors that need to be changed through the motivation of students.La «gamificación», aplicada a la educación, puede afectar positivamente a la motivación e implicación del alumnado, si bien aún existen pocas investigaciones que respalden sus bondades y marquen pautas sobre cómo realizar este proceso. Este trabajo tiene como objetivo generar hipótesis dirigidas a facilitar el diseño de un futuro estudio piloto en el ámbito de la educación superior en modalidad e-learning. Para ello, se estudiaron factores relacionados con el alumnado y el profesorado del Máster de Educación y Nuevas Tecnologías de la Universidad a Distancia de Madrid (UDIMA). La metodología utilizada combina aspectos cualitativos y cuantitativos con una finalidad descriptiva y exploratoria. Para la obtención de datos se utilizaron dos cuestionarios on-line diferentes para el profesorado y el alumnado, incluyéndose en este último una traducción del test BrainHex. A partir de los datos y de la revisión de la literatura existente se generan conclusiones acerca de la aceptación del alumnado y del profesorado respecto a la introducción de la gamificación en la formación, sobre qué tipo de elementos de gamificación son más adecuados para su uso en el contexto de la UDIMA y a la motivación de qué aspectos o conductas deberían dirigirse para su éxito

Integración de un Planificador de Trayectorias Parametrizado en la Arquitectura Robótica ROS

En este trabajo se presenta la integración de un nuevo planificador reactivo de movimiento dentro de la arquitectura robótica ROS. Este planificador, desarrollado originalmente como parte de la librería MRPT y basado en el Espacio de Trayectorias Parametrizado (TP-Space), amplia las posibilidades de navegación de las plataformas robóticas actuales mediante la generación de trayectorias tanto circulares como no-circulares, así como la posibilidad de contemplar la geometría 3D del robot (no restringiéndose a formas prismáticas). La integración se ha realizado garantizando la compatibilidad con el stack de navegación autónoma más popular de la plataforma ROS, adaptando el funcionamiento de dicho reactivo a la interfaz de comunicación estándar de ROS, siendo este compatible con los planificadores globales existentes. Para validar este trabajo, se han realizado múltiples pruebas de navegación en entornos de interior (tanto simulados como reales), con presencia de obstáculos y donde la plataforma robótica es equipada con diversas cámaras RGB-D y un escáner láser.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. Proyecto WISER (DPI2017-84827-R), financiado por el Ministerio de Ciencia e Innovación contando con fondos del Fondo Europeo de Desarrollo Regional (FEDER)

Lagochilascaris minor Leiper, 1909 (Nematoda: Ascarididae) in Mexico: three clinical cases from the Peninsula of Yucatan

Human lagochilascariasis (HL) is a parasite produced by Lagochilascaris minor Leiper 1909 that also can be found in cats and dogs. HL is considered an emerging zoonosis in the Americas, spreading from Mexico to Argentina, and the Caribbean Islands. The present paper describes three HL cases from the Peninsula of Yucatan, Mexico, recorded in the last decade. It describes the characteristics of the lesions and discusses the route of transmission in humans and particularly in the observed patients.La Lagochilascariasis humana (HL) es producida por Lagochilascaris minor Leiper, 1909; el cual es un parásito que puede ser encontrado también en gatos y perros. HL es considerada una zoonosis emergente en América distribuida desde México hasta Argentina y las islas del Caribe. El presente artículo describe tres casos de HL en la Península de Yucatán, México registrados en la última década. Se describen las características de las lesiones y se discute la ruta de transmisión en humanos y particularmente en los pacientes observados

Factores Psicosociales Que Intervienen En El Rendimiento Académico Estudio De Caso: Análisis A Estudiantes De La Carrera De Cultura Física Y Entrenamiento Deportivo

The objective of the present research was to analyze the psychosocial factors that intervene in the academic performance of the students in the race of physical culture and sports training of the “Universidad Nacional de Chimborazo” in the academic period from September 2014 to February 2015. The study sample was 72 students of a population of 97 students, 57 male and 15 female. The methodology of this study uses a cross-sectional research, quasi-experimental, qualitative-quantitative, bibliographic, and field research. Based on the collection of data, the instruments used were the academic record. A questionnaire was developed which served to identify the psychosocial factors of the students. Among the most relevant results, it was evidenced that out of 97 students corresponding to 100%, only 25, that is 25.77%, exceeded the required score to approve the semester. Therefore, 72 students representing 74.22% obtained lower score than required for approval. In conclusion, it was obtained that the psychosocial factors that influenced the academic performance of the students were: the always consumption of cigarettes representing 25%. On the other hand, 55.56% had difficulty in sometimes distributing their time adequately for educational tasks