Algunas consideraciones acerca de materiales reciclados en las necrópolis prerromanas cacereñas

En el contexto de los cementerios prerromanos de la provincia de Cáceres ha sido posible detectar un conjunto significativo de elementos vasculares en los que resultan evidentes algunos síntomas de pragmatismo. El empleo de urnas y vasos reparados, defectuosos o reciclados hallados en este ámbito constituyen, a nuestro entender, un buen elemento de juicio, al menos uno más. para la comprensión de la mentalidad social de estas comunidades

Analysis of the geometric altimetry to support aircraft optimal profiles within future 4D trajectory management

The use of barometric altimetry is to some extent a limiting factor on safety, predictability and efficiency of aircraft operations, and reduces the potential of the trajectory based operations capabilities. However, geometric altimetry could be used to improve all of these aspects. Nowadays aircraft altitude is estimated by applying the International Standard Atmosphere which differs from real altitude. At different temperatures for an assigned barometric altitude, aerodynamic forces are different and this has a direct relationship with time, fuel consumption and range of the flight. The study explores the feasibility of using sensors providing geometric reference altitude, in particular, to supply capabilities for the optimization of vertical profiles and also, their impact on the vertical Air Traffic Management separation assurance processes. One of the aims of the thesis is to assess if geometric altitude fulfils the aeronautical requirements through existing sensors. Also the thesis will elaborate on the advantages of geometric altitude over the barometric altitude in terms of efficiency for vertical navigation. The evidence that geometric altitude is the best choice to improve the efficiency in vertical profile and aircraft capacity by reducing vertical uncertainties will also be shown. In this paper, an atmospheric study is presented, as well as the impact of temperature deviation from International Standard Atmosphere model is analyzed in order to obtain relationship between geometric and barometric altitude. Furthermore, an aircraft model to study aircraft vertical profile is provided to analyse trajectories based on geometric altitudes

De villa a qarya. Transformación y continuidad en el campo emeritense (ss. I-IX). Primer balance de las actuaciones arqueológicas (2002-2004) en el Pozo de la Cañada

International audienceEven if the different preventive archaeological excavations in the place named Pozo de la Cañada (Guareña, Badajoz) have only given information on a small part of this site, they offer interesting perspectives about the transformation process of Mérida's countryside between the 1st and the 9th centuries. Indeed, the results show a much longer and more complex occupation than the data of the beginning of the 20th century could have made us think. However, the data we have are very patchy because of a significantly disturbed stratigraphy and of numerous solutions of continuity between the different zones. As a consequence, we can only outline a few aspects of the everyday life around a Roman villa and its continuity during the Late Antiquity and the beginning of the Emirate.Aunque las intervenciones de arqueología preventiva llevadas a cabo en El Pozo de la Cañada (Guareña, Badajoz) sólo han documentado una parte muy reducida del yacimiento, abren interesantes perspectivas sobre el proceso de transformación del campo emeritense entre los siglos I-IX. En efecto, los resultados muestran una ocupación mucho más dilatada y compleja que la que los datos de los primeros años del s. XX hacían suponer. La información con la que contamos es muy fragmentaria debido a una estratigrafía notablemente perturbada y numerosas soluciones de continuidad entre los diferentes sectores. Por ello, sólo podemos atisbar algunos aspectos de la vida cotidiana desarrollada en torno a una villa romana y su continuidad en la tardoantigüedad y el principio del Emirato

La producción republicana del plomo en el ámbito del Guadiana Medio

La producción de la plata en Hispania ha copado un lugar preeminente en los textos antiguos referidos al periodo republicano en la Península Ibérica y en la tradición historiográfica de la conquista romana. Sin embargo, el plomo no ha gozado de la misma atención, a pesar de que su geología, minería y procesos metalúrgicos guardan una relación muy íntima con aquélla. En este trabajo se incide en una dialéctica estrecha y continua entre ambos metales, confiriendo al plomo un papel muy relevante, protagonista en determinadas áreas geológicas e ineludible en la actividad de otras. El análisis del registro arqueológico nos lleva a valorar el potencial de esta producción como “recurso estratégico”, clave para entender la expansión romana en esta parte de Hispania. La actividad minero-metalúrgica, inserta en unas redes y circuitos industriales o empresariales, parece adquirir una proyección geográfica que escapa de esta parte de la fachada norte de Sierra Morena e inscribirse plenamente en la política económica de la propia Roma, obligada a defender sus intereses en cada momento.</p

Accelerated Extinction Profiles for Anomaly Detection in Fluvial Ecosystems

New multispectral sensors, which are capable of capturing high resolution images through low altitude drone flights, offer access to a wealth of information about the Earth's surface at a significantly lower cost than other imaging devices. The process of identifying unexpected patterns within an image that do not conform to the expected behavior is known as anomaly detection (AD). When applied to fluvial ecosystem monitoring, this involves detecting the existence of small constructions or roads that allow automatic alarms to be produced for the people in charge of monitoring the ecosystem. The extraction of spatial information is a critical step in AD, since it determines the final quality of the AD and it is a computationally expensive processing. In this work, Extinction Profiles (EP) are selected to perform a multilevel implicit segmentation of the image, thus extracting the spatial information of relevance. A computationally efficient implementation of the EP-based spatial extraction of information for multidimensional images is proposed in this paper, as it is a basic step in the detection of anomalies in natural ecosystems. The proposed method takes advantage of heterogeneous computing to perform the task in a reduced execution time.This work was supported in part by grants PID2019--104834GB--I00, PID2022-141623NB-I00, and TED2021--130367B--I00 funded by MCIN/AEI/10.13039/501100011033 and by European Union NextGenerationEU/PRTR. It was also supported by Xunta de Galicia - Consellería de Cultura, Educación, Formación Profesional e Universidades [Centro de investigación de Galicia accreditation 2019-2022 ED431G-2019/04 and Reference Competitive Group accreditation, ED431C-2022/16], by Junta de Castilla y León [Project VA226P20 (PROPHET--II)], and by European Regional Development Fund (ERDF)

Evolución histórica de la vivienda de protección pública en Madrid

El problema del alojamiento de la población obrera en España se intentó solucionar a partir de 1853 con diversas medidas legislativas, con escaso resultado. Tras la promulgación de la primera Ley de casas baratas (1911) se inició la intervención pública que alcanzaría su máximo desarrollo en la década 1960-1970 y que estaría acompañada numerosas iniciativas de promotores privados (cajas de ahorros, empresas, instituciones religiosas). A pesar de ello permanecerían hasta casi finales del siglo XX la autoconstrucción o el barraquismo como formas de alojamiento obrero

Criteria for Positioning Active Multilateration Stations Located Close to Distance Measuring Equipment

The need for the use of another surveillance system when radar cannot be used is the reason for the development of the Multilateration (MLT) Systems. However, there are many systems that operate in the L-Band (960-1215MHz) that could produce interference between systems. At airports, some interference has been detected between transmissions of MLT systems (1030MHz and 1090MHz) and Distance Measuring Equipment (DME) (960-1215MHz)

Use of hydrodynamic cavitation for volatile removal compound

© 2017. This version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/Hydrodynamic cavitation and its feasibility for volatile compound removal in enclosed channels is discussed in this paper. Very high Reynolds numbers are needed to rupture liquid by decreasing its pressure below its saturated vapour pressure. Hence, a simple stratified flow, at which the two phases separate, is precluded in vertical and horizontal tubes, where turbulence stresses will be much larger than the buoyant forces. The most probable flow regime at this high turbulence regime is a bubble- or annular flow, where the volatile matter tends to concentrate in the centre of the pipe because of the lift force resulting from the unequal flow of the viscous liquid around the bubbles in the presence of the pipe wall. Therefore, boiling the volatile matter for volatile compound removal is not enough if hydrodynamic cavitation is pursued. The attainable efficiency must also be assessed. An expression for the volatile removal efficiency and the main parameters affecting this efficiency were derived by utilising a simplified geometrical and physical model. The efficiency was found to approximate a power law as a function of the volatile concentration and its strong dependence on the size of the volatile bubble reasonably well. This result implied the need of bubble growth and the limitation of the process for highly concentrate compounds to a few percent concentrations. With regard to energetic requirements, both thermal and hydrodynamic cavitations are quantitatively similar. Furthermore, the choice of one or another corresponds more to the kind of energy source available.Peer ReviewedPostprint (author's final draft

The brinesiphon: a homolog of the thermosiphon driven by induced salinity and downward heat transfer

© 2017. This version is made available under the CC-BY-NC-ND 4.0 licenseThe basis of a novel method for passive solar water heating homologous to the thermosiphon but driven by induced salinity, which causes a fluid to circulate without the need for a mechanical pump and with inverse natural convection (downward heat transfer), is outlined. The brinesiphon, like the thermosiphon, operates by harnessing the tendency of a less dense fluid to rise above a denser fluid, resulting in fluid motion through a collector, but with two exceptions: first, the buoyancy is controlled by induced salinity gradients rather than thermal gradients, and second, as a result, natural convection is in the opposite direction than that in the homologous thermosiphon concept; i.e., hot fluid flows down, and cold fluid rises. A brinesyphon may be more suitable for solar domestic water heating systems than the thermosiphon because the direction of flow allows downward transfer from a solar collector to a lower storage tank without any type of mechanical pumping system.Peer ReviewedPostprint (author's final draft

Cuevas funerarias en el Tajo interior: a propósito de Maltravieso

Peer Reviewe