Basket-Handle Arch and Its Optimum Symmetry Generation as a Structural Element and Keeping the Aesthetic Point of View

The arches were a great advance in construction with respect to the rigid Greek linteled architecture. Its development came from the hand of the great Roman constructions, especially with the semicircular arch. In successive historical periods, different types of arches have been emerging, which in addition to their structural function was taking aesthetic characteristics that are used today to define the architectural style. When, in the construction of a bow, the rise is less than half the springing line, the semicircular arch is no longer used and the segmental arch is used, and then on to another more efficient and aesthetic arch, the basket-handle arch. This study examines the classic geometry of the basket-handle arch also called the three-centered arch. A solution is proposed from a constructive and aesthetic point of view, and this is approached both geometrically and analytically, where the relationship between the radius of the central arch and the radius of the lateral arch is minimized. The solution achieved allows the maximum springing line or clear span to be saved with the minimum rise that preserves the aesthetic point of view, since the horizontal thrust of a bow is greater than the relationship between the springing line of the arch and the rise. This solution has been programmed and the resulting software has made it possible to analyse existing arches in historic buildings or constructions to check if their solutions were close or not from both points of view. Thus, it has been possible to verify that in most of the existing arches analyzed, the proposed solution is reached

Distributed formation control of multiple unmanned aerial vehicles over time-varying graphs using population games

© 2016 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.This paper presents a control technique based on distributed population dynamics under time-varying communication graphs for a multi-agent system structured in a leader-follower fashion. Here, the leader agent follows a particular trajectory and the follower agents should track it in a certain organized formation manner. The tracking of the leader can be performed in the position coordinates x; y; and z, and in the yaw angle phi. Additional features are performed with this method: each agent has only partial knowledge of the position of other agents and not necessarily all agents should communicate to the leader. Moreover, it is possible to integrate a new agent into the formation (or for an agent to leave the formation task) in a dynamical manner. In addition, the formation configuration can be changed along the time, and the distributed population-games-based controller achieves the new organization goal accommodating conveniently the information-sharing graph in function of the communication range capabilities of each UAV. Finally, several simulations are presented to illustrate different scenarios, e.g., formation with time-varying communication network, and time-varying formationPeer ReviewedPostprint (author's final draft

Development and validation of a one-dimensional solver in a CFD platform for boiling flows in bubbly regimes

This paper presents a new one-dimensional solver for two-phase flow simulations where boiling is involved. The solver has been implemented within the OpenFOAM® platform. The basic formulation follows the Eulerian description of the Navier–Stokes equations. Different closure equations for one-dimensional simulations are also included, as well as a subcooled boiling model in order to perform accurate computations of the mass and heat transfer between phases. In addition to the fluid, a domain is included in order to represent the solid structure, so the solver is able to solve conjugate heat transfer problems. Two different test cases are presented in this work, first a single-phase test case in order to verify the conjugate heat transfer, and then a case based on the Bartolomej international benchmark, which consists of a vertical pipe where the fluid runs upwards while it is heated. Transient calculation were performed, and the results were compared to the TRACE system code, and to the experimental data in the corresponding case. With this calculations, the capability of this new solver to simulate one-dimensional single-phase and two-phase flows including boiling is demonstrated. This work is a first step of a final objective, which consists in allowing a 1D–3D coupling within the CFD platform, avoiding external links

Basket-Handle Arch and Its Optimum Symmetry Generation as a Structural Element and Keeping the Aesthetic Point of View

The arches were a great advance in construction with respect to the rigid Greek linteled architecture. Its development came from the hand of the great Roman constructions, especially with the semicircular arch. In successive historical periods, different types of arches have been emerging, which in addition to their structural function was taking aesthetic characteristics that are used today to define the architectural style. When, in the construction of a bow, the rise is less than half the springing line, the semicircular arch is no longer used and the segmental arch is used, and then on to another more efficient and aesthetic arch, the basket-handle arch. This study examines the classic geometry of the basket-handle arch also called the three-centered arch. A solution is proposed from a constructive and aesthetic point of view, and this is approached both geometrically and analytically, where the relationship between the radius of the central arch and the radius of the lateral arch is minimized. The solution achieved allows the maximum springing line or clear span to be saved with the minimum rise that preserves the aesthetic point of view, since the horizontal thrust of a bow is greater than the relationship between the springing line of the arch and the rise. This solution has been programmed and the resulting software has made it possible to analyse existing arches in historic buildings or constructions to check if their solutions were close or not from both points of view. Thus, it has been possible to verify that in most of the existing arches analyzed, the proposed solution is reached

Cooperativa agrícola de pequeños productores en la reserva del Merendón, San Pedro Sula, Honduras

El siguiente trabajo consiste en formar y estructurar una cooperativa agrícola en una Zona de Reserva muy cercana a la segunda ciudad más grande de Honduras (San Pedro Sula). Debido a los precios tan bajos que reciben los agricultores por la venta de productos en la ciudad, todo ello provocado entre otros factores por la independencia entre productores y la poca fuerza que pueden ejercer en el mercado, se crea la necesidad de actuar en conjunto. Para ello se forma la cooperativa COME (Cooperativa del Merendón) solo a 30 km de San Pedro Sula. Para realizar el proyecto se hicieron grupos de trabajo entre agricultores, entrevistas, visitas a sus parcelas, visitas a otras cooperativas y reuniones en la municipalidad, compras en los mercados locales y entrevistas en cuatro supermercados de la ciudad. Se ha diseñado la estrategia de la cooperativa, incluida la marca y logotipo, la política de ventas y las necesidades de producción. El presupuesto es de cien mil euros y el volumen de negocio de algo más de 125.000 euros anuales. Además de conseguir trabajo para las 32 familias involucradas se generaría empleo para 18 personas

XIV Foro Internacional sobre la Evaluación de la Calidad de la Investigación y de la Educación Superior (FECIES)

Introducción. El Proceso de Bolonia ha impulsado un nuevo modelo educativo que pretende centrar las metodologías docentes en el aprendizaje de los estudiantes, priorizando el manejo de herramientas por encima de la mera acumulación de conocimientos. Objetivo. El objetivo de este trabajo es evaluar la eficacia del aprendizaje colaborativo en la asignatura “Sistemas de Comunicación”, que se imparte en la E.T.S. Ingenieros de Telecomunicación de la Universidad de Valladolid. Método. Se emplearon diferentes herramientas basadas en el aprendizaje colaborativo dentro de la “Práctica sobre telefonía móvil de cuarta generación”. Dicha práctica está compuesta por diferentes actividades: (i) Trabajo escrito individual; (ii) Actividad de revisión por pares; (iii) Debate; (iv) Actividad puzle; (v) Trabajo escrito grupal; y (vi) Exposición y defensa del trabajo grupal. Resultados. Las encuestas realizadas a los alumnos mostraron que están muy satisfechos con esta práctica, puesto que les ha permitido desarrollar diferentes competencias transversales. Además, los alumnos obtuvieron una mayor calificación en el examen final de la asignatura en la pregunta sobre telefonía móvil de cuarta generación (Calificación sobre 1 punto = 0.59 0.33 puntos, media desviación estándar) que en la pregunta análoga sobre telefonía móvil de tercera generación, tema impartido utilizando una metodología docente tradicional (Calificación sobre 1 punto = 0.51 0.34 puntos). Conclusiones. El aprendizaje colaborativo no sólo permite a los alumnos adquirir competencias transversales, sino que además les permite interiorizar más conocimientos teóricos que la docencia tradicional

Cancelling out systematic uncertainties

We present a method to minimize, or even cancel out, the nuisance parameters affecting a measurement. Our approach is general and can be applied to any experiment or observation where systematic errors are a concern e.g. are larger than statistical errors. We compare it with the Bayesian technique used to deal with nuisance parameters: marginalization, and show how the method compares and improves by avoiding biases. We illustrate the method with several examples taken from the astrophysics and cosmology world: baryonic acoustic oscillations (BAOs), cosmic clocks, Type Ia supernova (SNIa) luminosity distance, neutrino oscillations and dark matter detection. By applying the method we not only recover some known results but also find some interesting new ones. For BAO experiments we show how to combine radial and angular BAO measurements in order to completely eliminate the dependence on the sound horizon at radiation drag. In the case of exploiting SNIa as standard candles we show how the uncertainty in the luminosity distance by a second parameter modelled as a metallicity dependence can be eliminated or greatly reduced. When using cosmic clocks to measure the expansion rate of the universe, we demonstrate how a particular combination of observables nearly removes the metallicity dependence of the galaxy on determining differential ages, thus removing the age-metallicity degeneracy in stellar populations. We hope that these findings will be useful in future surveys to obtain robust constraints on the dark energy equation of state

Factores para el estudio de la relación entre el grado de control familiar y el desempeño organizacional de las MIPyMEs familiares en el Área Metropolitana de Monterrey (Factors for the study of the relationship between the degree of family control and organizational performance of family MSMEs in Monterrey Metropolitan Area)

Abstract: The motors that move and drive the economies and societies of any country are the strength of the companies and might of the owners. At present, the importance of familyowned micro, small and medium sized companies is well known within the economies of the different Latin American and Caribbean countries; although, it is impossible to quantify exactly, the MSMEs are a key component in the contribution of economic growth, competitiveness, innovation, and in the generation of employment in any country; consequently, many governments and private institutions have initiated programs to promote this enterprising segment. It is not any different here in Mexico, as the above mentioned companies provide 50% of total employment and, in addition, 90% are family owned. This is where family influence or control becomes one of the important factors that have been proposed by the scientific academia as determining the organizational performance of a company. Based on this premise, the main topic of this article is to examine how the degree of family control affects the performance of said companies. Resumen: Los motores que mueven e impulsan la economía, y por ende a las sociedades de cualquier país, son la fortaleza de las empresas y la pujanza de sus propietarios. En la actualidad, se conoce la importancia de las Micros, Pequeñas y Medianas Empresas (MIPyMEs) familiares dentro de las economías de los diferentes países de América Latina y el Caribe, a pesar de que no es posible determinarla en su exacta magnitud. Las MIPyMEs son una pieza clave en la contribución al crecimiento económico, a la competitividad, a la innovación y a la generación de empleos de los países; como consecuencia, muchos gobiernos e instituciones privadas han puesto en marcha políticas y programas para promover a este segmento empresarial. En México, esto no es diferente ya que brindan el 50% de los puestos de trabajo del país y además se calcula que el 90% de las empresas son de carácter familiar. Debido a lo anterior es qie el control o influencia familiar, llegar a ser uno de los factores más sustentados de los que han sido propuestos por parte de la academia científica como factores que determinan el desempeño organizacional de una empresa; con base en lo anterior, el principal aspecto de este artículo es examinar como el grado de control familiar de las familias propietarias afecta el desempeño organizacional de sus empresas

Analysis of Magnetoencephalography Signals from Alzheimer’s Disease Patients Using Granger Causality

Producción CientíficaThe aim of this study was to analyze resting-state magnetoencephalography (MEG) activity in Alzheimer’s disease (AD) by means of Granger Causality (GC), an effective connectivity measure that provides an estimation of the information flow between brain regions. For this task, five minutes of MEG recordings were acquired with a 148-channel whole-head magnetometer from 36 AD patients and 26 healthy controls. Abnormalities in AD connectivity were found in the five typical frequency bands: delta (δ, 1-4 Hz), theta (θ, 4-8 Hz), alpha (α, 8-13 Hz), beta (β, 13-30 Hz), and gamma (γ, 30-65 Hz). Noteworthy increments in delta band and decrements in beta and gamma bands revealed disrupted connections in AD brain activity. Our analyses suggest that GC may be useful to characterize the brain impairment in AD.Ministerio de Economía y Competitividad (TEC2014-53196-R)Junta de Castilla y León (VA059U13 y BIO/VA08/15

NUBI : Navega, Ubícate, Busca, Interactúa : aplicación móvil adaptativa para fomentar comunidad, consultar y compartir información de disponibilidad de servicios estudiantiles de la Pontificia Universidad Javeriana

La falta de información acerca de la localización y disponibilidad de servicios es una causa de problemas de coordinación para actividades académicas. También, los grandes campus universitarios presentan dificultades para la movilización y búsqueda de servicios. De lo anterior, se presenta NUBI una aplicación móvil adaptativa, con el objetivo de atender las necesidades individuales y colectivas de los estudiantes de la Pontificia Universidad Javeriana mediante el aporte comunitario de información y coordinación de grupos.The insufficiency of information about the location and availability of services is a cause of coordination problems for academic activities. Some kind of university campuses presents difficulties for the mobilization and search of services. From the above, appears NUBI as an adaptive mobile application, with the objective of attending to the individual and collective needs of the students in the Pontificia Universidad Javeriana through the community contribution of information and group coordination.Ingeniero (a) de SistemasPregrad