El Colegio Máximo de Cartuja: Documentación histórica del monumento

Trabajo que ha servido para superar la fase de "investigación tutelada" en el programa de doctorado 2004-2005, línea de investigación: Cartografía y sistemas de información espacial (35), de la Universidad de Granada.Documentación histórica, arquitectónica y urbanística de un edificio declarado Bien de Interés Cultural en 1983, propiedad de la Universidad de Granada, del que se conserva poca documentación.Historical, architectural and urbanistic documentation of building declared of Cultural Interest in 1983, owned by the University of Granada, which remains poorly documented

GENERALIZACIÓN DE LA INTEGRAL DE ORDEN ORDINARIO A ORDEN FRACCIONARIO

El propósito de este artículo es demostrar la generalización de la integral de orden entero de Newton - Leibniz al operador de integración de orden fraccionario de Riemann-Liouville sobre un intervalo cerrado. En tal sentido, se presenta la teoría básica de las diversas aproximaciones de la integral de orden ordinario, el uso de la función gamma y la fórmula de Cauchy; los cuales sirven de base para llegar a la definición del operador de integración fraccionario, a partir de la nésima integral iterado ordinario de una función definida recursivamente. Luego, se hace las demostraciones y ejemplificaciones de la linealidad del operador integral fraccionario, y las proposiciones de este operador fraccionario aplicado a la función potencia y logarítmica

PCA based stress monitoring of cylindrical specimens using PZTs and guidedwaves

Since mechanical stress in structures affects issues such as strength, expected operational life and dimensional stability, a continuous stress monitoring scheme is necessary for a complete integrity assessment. Consequently, this paper proposes a stress monitoring scheme for cylindrical specimens, which are widely used in structures such as pipelines, wind turbines or bridges. The approach consists of tracking guided wave variations due to load changes, by comparing wave statistical patterns via Principal Component Analysis (PCA). Each load scenario is projected to the PCA space by means of a baseline model and represented using the Q-statistical indices. Experimental validation of the proposed methodology is conducted on two specimens: (i) a 12.7 mm (1/2”) diameter, 0.4 m length, AISI 1020 steel rod, and (ii) a 25.4 mm (1”) diameter, 6m length, schedule 40, A-106, hollow cylinder. Specimen 1 was subjected to axial loads, meanwhile specimen 2 to flexion. In both cases, simultaneous longitudinal and flexural guided waves were generated via piezoelectric devices (PZTs) in a pitch-catch configuration. Experimental results show the feasibility of the approach and its potential use as in-situ continuous stress monitoring application.Peer ReviewedPostprint (published version

FORMULACIÓN Y RESOLUCIÓN GRÁFICA DE PROGRAMAS MATEMÁTICOS

El presente artículo establece condiciones para la existencia de soluciones óptimas de programas matemáticos mediante condiciones de globalidad de los teoremas de Weierstrass y fundamental de la programación convexa, debido a la limitación que presenta el método de resolución gráfica cuando el número de variables de decisión es mayor que dos, para lo cual disponemos de criterios generales que garanticen la existencia de solución óptima de un programa matemático. El análisis gráfico nos ayuda a comprender resultados sobre cómo varían las soluciones óptimas de un programa cuando se modifica la función objetivo o el conjunto de soluciones factibles. Así mismo, las diferentes definiciones y técnicas permiten aplicar la optimización matemática a la economía. Finalmente, el presente artículo es un aporte al estudio de la optimización sin restricciones

Energy Absorption of Aluminium Extrusions Filled with Cellular Materials Under Axial Crushing: Study of the Interaction Effect

Artigo publicado no número especial Armour and Protection Systems: https://www.mdpi.com/journal/applsci/special_issues/Armour_Protection_System[Abstract] This investigation focuses on the interaction effect during the quasi-static axial crushing of circular and square thin-walled aluminium extrusions filled with polymeric foam or cork. The increment in the absorbed energy due to interactions between materials was assessed using a validated numerical model calibrated with experimental material data. Simulations were run with variable cross-section dimensions, thickness, and foam density. The results were used to adjust the parameters of design formulas to predict the average crush forces of foam- and cork-filled thin-walled tubes. The analysis of the energy dissipation per unit volume revealed that the highest increments due to the interaction between materials appeared in the foam-filled square extrusions. Energy dissipation increased with higher density foams for both cross-sections due to a stronger constraint of the aluminium walls, and thus a reduction of the folding length. Thinner tube walls also delivered a higher improvement in the energy dissipation per unit volume than those with thicker walls. The contribution of friction was also quantified and investigated.This research was funded by the Spanish Goverment (Ministerio de Economía y Competitividad) grant number PID2019-108307RB-I00; and from the Research Council of Norway grant number 237885, SFI-CASA, and NTNUResearch Council of Norway; 237885https://www.mdpi.com/journal/applsci/special_issues/Armour_Protection_Syste

Support stiffness monitoring of cylindrical structures using magnetostrictive transducers and the torsional mode T(0,1)

In this paper, a support stiffness monitoring scheme based on torsional guided waves for detecting loss of rigidity in a support of cylindrical structures is presented. Poor support performance in cylindrical specimens such as a pipeline setup located in a sloping terrain may produce a risky operation condition in terms of the installation integrity and the possibility of human casualties. The effects of changing the contact forces between support and the waveguide have been investigated by considering variations in the load between them. Fundamental torsional T(0,1) mode is produced and launched by a magnetostrictive collar in a pitch-catch configuration to study the support effect in the wavepacket propagation. Several scenarios are studied by emulating an abnormal condition in the support of a dedicated test bench. Numerical results revealed T(0,1) ultrasonic energy leakage in the form of SH0 bulk waves when a mechanical coupling between the cylindrical waveguide and support is yielded. Experimental results showed that the rate of ultrasonic energy leakage depends on the magnitude of the reaction forces between pipe and support; so different levels of attenuation of T(0,1) mode will be produced with different mechanical contact conditions. Thus, it is possible to relate a measured attenuation to variations in the supports condition. Results of each scenarios are presented and discussed demonstrating the feasibility and potential of tracking of the amplitude of the T(0,1) as an indicator of abnormal conditions in simple supports.Peer ReviewedPostprint (published version

CRITERIO DE ESTABILIDAD Y ESTABILIDAD ASINTÓTICA DE LA SOLUCIÓN EN LOS SISTEMAS DE ECUACIONES DIFERENCIALES AUTÓNOMOS NO LINEALES

El propósito de este artículo es establecer la estabilidad y la estabilidad asintótica de la solución en los sistemas de ecuaciones diferenciales autónomos no lineales, sin conocer la solución del sistema. Pero presenta dificultad dicha estabilidad como por ejemplo no se tiene una matriz cuadrada no singular disponible para determinar la estabilidad y estabilidad asintótica, salvo que hallemos efectivamente todas las soluciones del sistema, lo que puede resultar difícil si no imposible. Sin embargo, se estableció un criterio de estabilidad y estabilidad asintótica a través de los puntos de equilibrio de un sistema autónomo no lineal lo cual es posible obtenerlo por medio de las propiedades de una función multivariable de Liapunov. Esta función multivariable tiene las propiedades de que es una función real de variable vectorial en la que en un punto de equilibrio se anula y tiene un mínimo local estricto, y además la función multivariable decrece a lo largo de la solución del sistema de ecuaciones diferenciales autónomas no lineales. Estas funciones multivariables de Liapunov se justifican principalmente por la importancia que tiene en las investigaciones realizadas como por ejemplo en la construcción de un control analítico para dar la globalidad óptima a un cuerpo rígido con un punto fijo, para la estabilidad de la precisión y la rotación permanente de un giroscopio, y el estudio regulador de una máquina a vapor

Offensive and defensive team performance: relation to successful and unsuccessful participation in the 2010 Soccer World Cup

The present study was conducted to analyze the impact of selected offensive and defensive performance indicators in relation to teams’ success in the 2010 soccer World Cup. The sample used corresponded to 54 matches played in both the group and knockout stage. The game-related statistics gathered were: total shots, shots on goal, shots off goal, % of shots on goal from total shots, % of shots off goal from total shots, offensive and defensive effectiveness 1 (goals/total shots), and offensive and defensive effectiveness 2 (goals/shots on goal). In addition, the first’s goal influence in the match’s outcome (for the team scoring the goal: win, draw, lose) was also investigated. The results showed that, during the group stage, successful teams had better values (P <0.05) in all offensive and defensive performance indicators, with the exception of shots off goal for and shots off goal against, respectively, than unsuccessful teams. In the knockout stage, successful teams were able to maintain the same offensive performance that in the group stage while most defensive performance indicators, with the exception of shots off goal against (P=0.80), tended (P<0.2) to worsen. During the group stage, the team scoring the first goal had 66.7% of victories, 4.2% of defeats and 29.2% of draws (P<0.001). In the knockout stage, the first goal effect had a stronger influence in game’s outcome than in the group stage (P<0.01) since in 81.3% of the cases the team scoring first won the match, versus 6.3% of defeats and 12.5% of draws. Thus, offensive variables related to shots on goal and goal effectiveness appear to be better indicators of team’s success in the last World Cup than defensive variables. This information has directly implications for coaches, providing relevant feedback to plan finishing (goal scoring) practices

The Relevance of EPC Labels in the Spanish Residential Market: The Perspective of Real Estate Agents

Assessment regarding the impact of Energy Performance Certificates (EPC) on the residential market is largely inconclusive; while the majority of hedonic analyses have found EPC ratings to be correlated with prices, opinion-based research has found a negligible impact on prices and other marketing variables. Using the opinion of qualified real estate agents, this paper explores whether, in Spain, EPC labels play any role in housing marketing, as well as the policy changes required to foster efficient dwellings. The results reveal a large misunderstanding of the EPC labels, since they are seen as a global home-quality indicator, while their impact on residential marketing is quite poor. Apparently, both supply and demand place a small interest in energy performance, although it is slightly larger for sellers/buyers in relation to lenders/tenants. In any case, EPC labels are far from blurring the energy information asymmetry, since most of the buyers/tenants are informed of the EPC rating after having selected their home. Overall, the EPC scheme has a poor reputation exacerbated by inaccuracies, unintelligible units to express the financial and environmental implications of energy efficiency, and an apparent weak supervision. These findings stress the need to improve the scheme; in doing so, realtors suggest the need for some companion policies.This paper has been produced in the framework of the EnerValor Project (MINECO/FEDER BIA 2015-63606-R

EXISTENCIA Y UNICIDAD DE LA SOLUCIÓN GENERALIZADA DE UNA ECUACIÓN DIFERENCIAL HIPERBÓLICA QUE MODELA LA PROPAGACIÓN DE UNA ONDA EN UN MEDIO ELÁSTICO SOMETIDA A UNA FUERZA EXTERNA

El propósito de este artículo fue investigar, cómo con el desarrollo del análisis funcional y la teoría de distribuciones se pueden establecer soluciones generalizadas que permiten resolver ecuaciones hiperbólicas que modelan la propagación de una onda en un medio elástico sometida a una fuerza externa. Desde un punto vista físico, este modelo hiperbólico requiere que la existencia de una solución sea físicamente aceptable y "controlable". Matemáticamente esto se traduce en problemas de existencia, unicidad y dependencia continua de las condiciones iniciales y de contorno. Se empleó para el desarrollo del artículo el método lógico deductivo para demostrar la existencia y unicidad de la solución generalizada del problema de evolución hiperbólica, que consistió en aproximar la solución del problema por auto funciones lineales de dimensión finita para luego construir un subespacio denso en un espacio de Hilbert separable. Luego lo dividimos en etapas: Acotación de las soluciones aproximadas, convergencia de las soluciones aproximadas y verificación de las condiciones iniciales. Así mismo, se demostró la unicidad de la solución generalizada