Registros cerámicos de época Taifa en madina labla (Niebla, Huelva) : un acercamiento tipológico

El presente estudio constituye un intento de clasificación de la cerámica del periodo taifa del asentamiento de Niebla (Huelva), según los registros obtenidos en la excavación realizada en el sector de murallas de El Desembarcadero, actividad enmarcada dentro del Proyecto de Arqueología Urbana de la Ciudad de Niebla (PAUCN). El conjunto cerámico estudiado revela unas conexiones bastante estrechas con otros registros cerámicos del Suroeste Peninsular.__________________________The present study constitutes an attempt of classification of the taifa ceramics from Niebla (Huelva), according to the registries obtained in the excavation made in the sector of walls of El Desembarcadero, activity framed within the Project of Urban Archeology of the City of Niebla. The studied ceramic set reveals quite narrow connections with other ceramic registries of the Southwest of al-Andalus

Apuntes sobre un zócalo pintado de época almohade hallado en Niebla (Huelva)

El presente trabajo tiene como objeto el análisis de un fragmento de zócalo con decoración pintada de tema geométrico descubierto en el transcurso de las excavaciones realizadas en Niebla (Huelva) y desarrolladas en el marco del Proyecto de Arqueología Urbana de la Ciudad de Niebla. El estudio se apoya en gran medida en las investigaciones realizadas sobre otro fragmento de pintura hallado en el Patio del Yeso del Alcázar de Sevilla, con el que el zócalo de Niebla presenta asombrosas conexiones técnicas, formales y estilísticas. Se hace una valoración conjunta de ambas manifestaciones, poniendo en relación su estructura geométrica básica con la de otros zócalos hispanomusulmanes._______________________The object of the present work is the study of a painted socle discovered in the course of the excavations carried out in Niebla (Huelva) and developed within the framework of the Project of Urban Archaeology of the City of Niebla. The study leans to a great extent in the investigations of another painting fragment found in Patio del Yeso of Seville, with which the socle of Niebla presents amazing connections in relation to the technique, form and style. A joint valuation of both manifestations is made, putting in relation its basic geometric structure with another Hispanic-muslim socles

Resource-Based View and SMEs Performance Exporting through Foreign Intermediaries: The Mediating Effect of Management Controls

Following the resource-based view, this research empirically explores the role of formal and informal management control in mobilizing export resources to develop export capabilities, influencing the export performance of small and medium-sized enterprises (SMEs) in an interorganizational relationship context. Empirical data were collected using a survey administrated online to finance managers in Spanish SMEs which use foreign intermediaries to access export markets. In this setting, evidence mainly suggests, first, that management control systems (MCSs) play a relevant mediating role between the effect of, on the one hand, resources on capabilities, and, on the other hand, resources and capabilities on performance. Second, that MCSs and capabilities play a interrelated double mediating effect between the impact of resources on performance; more specifically, a significant double indirect effect is found (1) between financial resources, behavior control, customer relationship building capability and performance, and (2) between physical resources, behavior control, customer relationship building capability and performanc

La prisión domiciliaria como alternativa de política pública para combatir el hacinamiento carcelario en Colombia

Artículo de reflexiónEl desarrollo de este artículo de reflexión presenta la prisión domiciliaria como una opción dentro del sistema punitivo colombiano que influye de manera positiva en el escenario actual de hacinamiento carcelario que se presenta en el país. La importancia de considerar mecanismos sustitutivos de la prisión en un sistema penitenciario y carcelario como el colombiano que permanece en un Estado de Cosas Inconstitucional por la situación de hacinamiento carcelario desde hace 20 años es necesaria y pertinente. La Prisión domiciliaria se presenta como una posible solución que permitiría cesar la vulneración de derechos en la que actualmente se encuentran las personas privadas de la libertad, ya que los establecimientos carcelarios han excedido su capacidad y hasta la fecha las políticas públicas adoptadas por parte del Estado no han logrado solucionar el problema por completo.INTRODUCCIÓN 1. GENERALIDADES 2. LEVANTAMIENTO DE INFORMACIÓN 3. CONCLUSIONESPregradoAbogad

Seismic site classification from the horizontal-to-vertical response spectral ratios: use of the Spanish strong-motion database

Normally, the average of the horizontal-to-vertical (H/V) ratios of the 5% damped response spectra of ground motions is used to classify the site of strong-motion stations. In these cases, only the three-orthogonal as-recorded acceleration components are used in the analysis, and all the vector compositions that can generate a different response for each period oscillator are excluded. In this study, the Spanish strong-motion database was used to classify the sites of accelerometric stations based on the predominant periods through the average horizontal-to-vertical spectral ratios (HVSR) of recorded ground motions. Moreover, the directionality effects using the vector composition of the horizontal components of ground motions were also considered in the estimations of H/V ratios. This consideration is a relevant novelty compared to the traditional H/V ratios methods. Only earthquakes with magnitudes above 3.5 and hypocentral distances below 200 km were selected, which resulted in 692 ground-motion records, corresponding to 86 stations, from events in the period between 1993 and 2017. After the analysis, a predominant-period site classification was assigned to each station. On the whole, the obtained mean and standard deviation values of the spectral ratios are comparable to those shown by other researchers. Therefore, the advantages of the proposed procedure, which takes the directionality effects into account, can be summarized as follows: (a) The obtained information is richer and gives enables more sophisticated and realistic analyses on the basis of percentiles and (b) it is easier to detect anomalous stations, sites, and/or accelerograms. Moreover, the method eliminates the effect of directionality as a contributor to epistemic uncertainty.Peer ReviewedPostprint (published version

Instrumentos legislativos efectivos para la salvaguarda de derechos de niños, niñas, adolecentes y jóvenes participes del conflicto armado colombiano

Este trabajo desarrolla una búsqueda por establecer, si los instrumentos normativos existentes son efectivos para proteger los derechos de los NNA que han sido víctimas y victimarias en el conflicto armado. Se describe la problemática del reclutamiento infantil por parte de grupos armados desde el punto de vista histórico y actual. Se estudiarán los instrumentos jurídicos actuales en la legislación nacional. Se analizan mecanismos jurídicos internacionales que permiten proteger los derechos de los menores y casos internacionales de procesos en contra de particulares y estados por reclutamiento de menores. Se analiza también, casos de derecho comparado. Se busca poner de presente la ausencia de un instrumento legislativo en el marco jurídico colombiano que efectivamente permita aplicar actos jurídicos y administrativos para la salvaguarda de los derechos de los menores mencionados.This paper develops a search to establish, whether existing regulatory instruments are effective in protecting the rights of children/Adolescents who have been victims and victimizers in the armed conflict. Describes the problem of child illegal recruitment from a historical and current point of view. We will study the existing legal instruments in national legislation. It discusses international legal mechanisms that allow protecting the rights of children in international cases of proceedings against individuals and States. In addition, cases of comparative law will be analyzed. Is a thoughtful analysis that seeks to present the absence of a legislative instrument in the Colombian legal framework allowing effectively implementing legal and administrative actions for the safeguarding of the rights of children.Abogado (a)Pregrad

A Security Proposal Based on a Real Time Agent to Protect Web Services Against DoS Attack

This paper describes a novel proposal based on a real time agent to detect and block denial of service attacks within web services environments. The real time agent incorporates a classification mechanism based on a Case-Base Reasoning (CBR) model, where the different CBR phases are time bounded. In addition, the reuse phase of the CBR cycle incorporates a mixture of experts to choose a specific technique of classification depending on the feature of the attack and the available time to solve the classification.This paper describes a novel proposal based on a real time agent to detect and block denial of service attacks within web services environments. The real time agent incorporates a classification mechanism based on a Case-Base Reasoning (CBR) model, where the different CBR phases are time bounded. In addition, the reuse phase of the CBR cycle incorporates a mixture of experts to choose a specific technique of classification depending on the feature of the attack and the available time to solve the classification

An Attack Detection Mechanism Based on a Distributed Hierarchical Multi-agent Architecture for Protecting Databases

This paper presents an innovative approach to detect and classify SQL injection attacks. The existing approaches are centralized while this proposal is based on a distributed hierarchical architecture to provide a robust and dynamic strategy. The strategy for the classification and detection of SQL injection attacks uses a combination based on detection by anomalies and misuses. The detection by anomaly uses a case-based reasoning mechanism incorporating a mixture of neural networks. The approach has been tested and the results are presented in this paper.This paper presents an innovative approach to detect and classify SQL injection attacks. The existing approaches are centralized while this proposal is based on a distributed hierarchical architecture to provide a robust and dynamic strategy. The strategy for the classification and detection of SQL injection attacks uses a combination based on detection by anomalies and misuses. The detection by anomaly uses a case-based reasoning mechanism incorporating a mixture of neural networks. The approach has been tested and the results are presented in this paper

Nuevas perspectivas históricas acerca de la Huelva Islámica

A pesar del número de excavaciones arqueológicas realizadas en los últimos veinte años, hasta hoy no se había publicado cualquier estudio extenso que señalara algún elemento físico de la Huelva islámica. Los trabajos realizados en el año 2000 en la Plaza Ivon Cazenave permiten mostrar ahora un claro ejemplo de su arquitectura civil y del conjunto cerámico que existía en una casa típica del período almohade.____________________________Although many archaeological excavations have been carried out in Huelva in the last twenty years, there were no available study in which the islamic site were phisically shown. Archaeologycal works carried out in Plaza Ivone Cazenave allowes now to identify an example of its civil arquitecture and pottery records found in a house pertaining to the almohade period

Evaluación de la resistencia a la corrosión de recubrimientos de BixTiyOz, depositados mediante el sistema de Sputtering Magnetrón

En el presente trabajo de maestría se depositaron películas delgadas de titanato de bismuto (BixTiyOz) sobre sustratos de acero inoxidable 316L y aleación de titanio Ti6Al4V, mediante la técnica de Sputtering magnetrón RF; las películas fueron fabricadas con el objetivo de evaluar su resistencia a la corrosión al ser expuestas al ataque de una solución de NaCl al 3.5% P/V. Las películas delgadas fueron obtenidas a partir de un blanco con estequiometria Bi4Ti3O12 bajo condiciones variables de temperatura del sustrato, flujo de argón y potencia aplicada al blanco. Las películas fueron caracterizadas estructuralmente mediante difracción de rayos X (DRX), morfológicamente mediante microscopia electrónica de barrido (MEB) y perfilometría óptica. El análisis químico se hizo mediante espectroscopia de retrodispersión de Rutherford (ERR). La resistencia a la corrosión de las películas fue evaluada mediante polarización potenciodinámica (PP) y espectroscopia de impedancias electroquímicas (EIS). Se encontró que el mecanismo de corrosión que se da en los sistemas sustrato-película es del tipo picadura, debido a que se presenta corrosión localizada por la presencia de poros tanto en las películas producidas como en las capas pasivantes propias de cada sustrato.Abstract: In this work were deposited bismuth titanate thin films(BixTiyOz) on substrates of stainless steel 316L and titanium alloy Ti6Al4V by RF magnetron Sputtering technique; The thin films were made with the aim of assess their corrosion resistance when they are attacked by a 3.5% P/V NaCl solution. Thin films were obtained from a target with Bi4Ti3O12 stoichiometry under varying temperature conditions of substrate, Argon flow and power applied to the target. Thin films were structurally characterized by X-Ray Difraction (XRD), also they were morphologically characterized by Scanning Electron Microscopy (SEM) and optical profilometry. The chemical analysis was made by Rutherford Backscattering Spectroscopy (RBS). The corrosion resistance of the films was assessed by potentiodynamic polarization (PP) y Electrochemical Impedance Spectroscopy (EIS). It was found that the corrosion mechanism that occurs in substrate-film systems is the pitting type, for being presented localized corrosion due to the presence of pores both in the films produced and in the passive layers of each substrate.Maestrí