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  • GPR applications in Civil Engineering in Spain ¿ state-of-the-art

     Perez Gracia, Maria de La Vega; Solla, Mercedes; Santos Assunçao, Sonia Alexandra; Lorenzo, Henrique
    European Geosciences Union General Assembly
    Presentation's date: 2014-04-30
    Presentation of work at congresses

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    GPR was introduced in Spain in 1990, and the first significant work was the PhD thesis of H. Lorenzo in 1994. Due to its versatile applicability, the employ has been increased and actually, GPR is extensively used in detection of pipes, wiring and urban services mainly. During the last years, this method was also widely utilized in the detection of graves from the civil war and in forensic studies, with irregular results. It was also commonly applied in archaeology. Actually exists more than 20 private companies offering geotechnical services by means of GPR. Also, several public institutions as Universities and Research Institutes base part of their research in GPR or in GPR applications. Notwithstanding, no training courses of specific formation on GPR is offered, but in several doctorate programs it is possible to work with GPR. Also, in many schools, GPR is part of the geophysical formation of graduate students. However, no national guidelines and rules exist, and each company defines the investigation protocols. Nevertheless, one of the aims of the Comisión Española de Geodesia y Geofísica (Spanish Committee for Geodesy and Geophysics) is to define guidelines for the GPR studies. Probably, the existence of national guidelines or perhaps European guidelines could be the most effective way to promote the responsible use of GPR in different domains. On the other hand, perhaps recommendations on the use of combined methodologies could be a practical way to persuade in the application of geophysical non-destructive technologies. The CEDEX, Centro de Estudios y Experimentación de Obras Públicas (Center for Studies and Experimentation in Civil Engineering), which is a civil engineering research agency in Spain, offers different test sites to calibrate and evaluate the method. It is an autonomous organization, organically ascribed at present to the Ministry of Fomento, and functionally ascribed to the Ministries of Fomento and Medioambiente of Spain, giving assistance to various administrations, public institutions and private companies. What is more, some of the existing private companies have also minor test sites to analyze the behavior of the signal and its propagation depending on the type of asphalt concrete. GPR is used mainly in detection of pipes and urban services and various private companies are specialized in these tasks. Another widespread application is archaeological survey; one private company is also specialized in archaeology evaluations, using GPR combined with magnetometer. Forensic examinations are also common applications in Spain. Other less common applications are: regular inspection of roads, bridges and tunnels, cultural heritage buildings assessment, shallow geology studies and quality control in civil engineering.

  • Non-destructive analysis in cultural heritage buildings: evaluating the Mallorca cathedral supporting structures

     Perez Gracia, Maria de La Vega; Caselles Magallon, Jose Oriol; Clapes Boixader, Jaime; Martínez, Guillermo; Osorio Gomez, Raul
    NDT and E international
    Date of publication: 2013-10-01
    Journal article

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    Geophysical prospecting surveys are being increasingly used in non-destructive evaluations of structures, and several methods can be applied in the evaluation of cultural heritage buildings. However, accurate studies of cultural heritage structures usually need the application of combined techniques, historic and structural knowledge also being necessary. The present paper describes the pplication of two nondestructive testing techniques: ground-penetrating radar and seismic tomography, in the analysis of some structural elements' inner geometries and physical properties. This job is part of a more complete project developed to define the Mallorca Cathedral structural behaviour. Both geophysical methods are used in a complementary way. GPR allows the detection of small anomalies (changes of about centimetres), and the results are used to select the most appropriate seismic tomography initial model. The aim of the study is to define the internal structural configuration as well as the stone quality. Results reveal the internal structure of columns, walls and buttresses, showing different structural elements. Even when the visual inspection points to external damages, the detailed NDT evaluation indicates that the inner structure is in good condition and the ashlars are of good quality.

  • Ground penetrating radar railways inspection

     Perez Gracia, Maria de La Vega; Santos Assunçao, Sonia Alexandra; Pedret Rodes, Josep
    EAGE Conference & Exhibition incorporating SPE EUROPEC
    Presentation's date: 2013-06-11
    Presentation of work at congresses

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    Ground penetrating radar has been fully applied in civil engineering problems. This paper presents a case study applied to a railway line evaluation. The aim of the job was to study the stability of part of a railway line, using ground penetrating radar images. Radar data was processed in order to optimize the images, and different possible causes of the anomalies are evaluated. Radar data was acquired along the railway line, and noise due to metallic bars was diminished using migration processing. 3D radar imaging was obtained by interpolating the different radar profiles, and anomalies were analyzed in the three axes, defining their possible shape and position. As a result, two possible damaged zones were defined: the first one corresponds to a missing reflector, and could be caused by the merge of two or more layers; the second one was a deformed reflector, possible attributed to a sunken layer or a more wet material.

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    Project 4.4: application of GPR in association with other non-destructive testing methods in buildings and assessment and in geological/geotechnical tasks. State of the art and open issues  Open access

     Perez Gracia, Maria de La Vega; Dimitriadis, Klisthenis
    Civil Engineering Applications of Ground Penetrating Radar
    Presentation's date: 2013-07-24
    Presentation of work at congresses

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    Geophysics is the study of the earth¿s interior, using measurements based on physics principles. A part of this, geophysics is also used to explore the interior of construction materials of buildings and Monuments. The major advantage of this science is its absolute non-destructive character. However, despite geophysics exist since the beginning of the 19th century the Ground Penetrating Radar (GPR) method is recently introduced in this domain, counting almost 50 years of active contribution. During these years, GPR was proved very effective in the building assessment. In the field of geotechnical tasks and especially in geological tasks, its efficiency was limited and strongly dependent on the site conditions, mostly due to its limited in-depth penetration and relative target discrimination. Future research must be oriented to the improvement of these two major milestones, mostly into the antennas design and related instruments electronics design.

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    A new device laboratory: Experimental validation  Open access

     Pujol Vazquez, Gisela; Acho Zuppa, Leonardo; Napoles Alberro, Amelia Emelina; Estrada, J.; Santos Ferreira, Denise Carina; Perez Gracia, Maria de La Vega
    IFAC Symposium on Advances in Control Education
    Presentation's date: 2013-08
    Presentation of work at congresses

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    A device laboratory was designed to create a commanded disturbance to the Furuta inverted pendulum. This pendulum was modified by adding a second inverted pendulum coupled to the main one by means of a semi-rigid spring. The induced motion on the second inverted pendulum causes displacement of the center of mass of the system, producing a kind of perturbation similar to that presented on mobile inverted pendulum transportation units. A linear matrix inequality (LMI) controller is designed from the unperturbed model (based on the main pendulum without the second inverted one) and implemented to our system. Then, experimentally, the behaviour of the whole closed-loop system and the controller performance was analysed. According to the laboratory test, the LMI controller is robust enough in front of perturbation induced on the second pendulum.

  • Actividad de coordinacion interdepartamental: Experimentación mecatrónica de un péndulo invertido

     Pujol Vazquez, Gisela; Acho Zuppa, Leonardo; Napoles Alberro, Amelia Emelina; Perez Gracia, Maria de La Vega
    Congreso Universitario de Innovación Educativa en las Enseñanzas Técnicas (CUIEET)
    Presentation's date: 2013-07-11
    Presentation of work at congresses

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    From the educational point of view, collaboration between departments is always enriching. This paper presents how a problem arose in the area of mechanics, was resolved and implemented in the laboratory of the Department of Applied Mathematics III. From this collaboration came two graduate projects. In particular, graduate Mechanical students learned about control techniques, and applied it to the classic inverted pendulum experiment to study the Segway.

  • La gestión de la calidad: algunas reflexiones sobre los procesos de calidad que se implantan en los centros docentes universitarios

     Perez Gracia, Maria de La Vega; Lopez Lopez, Jose; Buenestado Caballero, Pablo; Garcia-Alzórriz Pardo, Juan Antonio; Torres Camara, Ricardo; Martinez Sanchez, Joan; Velasco Quesada, Guillermo
    Congreso Universitario de Innovación Educativa en las Enseñanzas Técnicas (CUIEET)
    Presentation's date: 2013-07-12
    Presentation of work at congresses

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    Resumen. Tras diseñar un sistema interno de garantía de calidad se inició el proceso de implantación. Sin embargo, este proceso se ha dilatado en el tiempo y no se ha podido finalizar todavía. Es posible que muchos de los problemas con los que nos hemos encontrado sean fallos del sistema diseñado, que no fueron previstos por el centro ni detectados por los revisores externos. La discusión sobre nuestra experiencia, contrastándola con la de otros centros puede ser una herramienta valiosa para mejorar un sistema complejo. Abstract. After the quality system design, implementation was the second step. However, several difficulties caused the delay in the implementation process and the system is not yet finalized. It is possible that some of the problems in the process were due to a non appropriate design or evaluation of the quality system. In our opinion, the discussion about the experience, contrasted to the other centres¿ experiences could help in the improvement of the system.

  • COST Action TU 1208 Civil Engineering Applications of Ground Penetrating Radar

     Pajewski, Lara; Pujades Beneit, Luis Gonzaga; García, Alfredo; Caselles Magallon, Jose Oriol; Salinas Naval, Victor; Lorenzo, Henrique; Perez Gracia, Maria de La Vega; Santos Assunçao, Sonia Alexandra; Solla, Mercedes; Clapes Boixader, Jaime; Canas Torres, Jose Antonio; Trincks, Immo; Neubauer, Wolfgang; VAN MEIRVENNE, Marc; Lambot, Sebastien; CRAEYE, Cristophe; MARCIC, Danijela; Bazic, Mario; LIBRIC, Lovorka; POLJAK, Dragan; RINGGAARD, Jorgen; BALAYSSAC, Jean-Paul; DEROBERT, Xavier; PICHOT DU MEZERAY, Christian; KIND, Thomas; TRELA, Christiane; STRYK, Josef; MATULA, Radek; PELLINEN, Terhi; WISEN, Roger; POPOVSKI, Borislav; LATKOSKI, Pero; KOPP, Christian; LOIZOS, Andreas; PLATI, Christina; MANACORDA, Guido; MASSA, Andrea; BENEDETTO, Andrea; FREZZA, Fabrizio; KUTEVS, Valerijs; D'AMICO, Sebastiano
    Participation in a competitive project

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  • Ground-penetrating radar resolution in cultural heritage applications

     Perez Gracia, Maria de La Vega; Gonzalez Drigo, Jose Ramon; Sala, Roger
    Near surface geophysics
    Date of publication: 2012-02-01
    Journal article

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  • El aprendizaje de competencias: un nuevo reto en la educación superior

     Perez Gracia, Maria de La Vega
    Date of publication: 2012-03-01
    Book chapter

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    El aprendizaje de competencias: un nuevo reto en la educación superior  Open access

     Perez Gracia, Maria de La Vega
    Date of publication: 2012-01-01
    Book chapter

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    Retos y perspectivas de la docencia universitaria

    En este trabajo se reflexiona acerca de la introducción de las competencias en la enseñanza superior y se muestra un ejemplo de inclusión de una competencia (trabajo en grupo) en los estudios de grado, proponiendo metodologías de evaluación de estas actividades.

    Competencias, evaluación, trabajo en grupo

  • Effects on the predominant periods due to abrupt lateral soil heterogeneities

     Salinas Naval, Victor; Santos Assunçao, Sonia Alexandra; Caselles Magallon, Jose Oriol; Perez Gracia, Maria de La Vega; Pujades Beneit, Luis Gonzaga; Clapes Boixader, Jaime
    World Conference on Earthquake Engineering
    Presentation's date: 2012-09
    Presentation of work at congresses

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  • Resultados de la fase inicial de los grados de ingeniería industrial de la EUETIB en función de la procedencia de los estudiantes y su nota de corte

     Lopez Lopez, Jose; Perez Poch, Antoni; Buenestado Caballero, Pablo; Garcia-Alzórriz Pardo, Juan Antonio; Perez Gracia, Maria de La Vega; Torres Camara, Ricardo; Martinez Sanchez, Joan; Velasco Quesada, Guillermo
    Congreso Universitario de Innovación Educativa en las Enseñanzas Técnicas
    Presentation's date: 2012-07-19
    Presentation of work at congresses

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  • Nuevas Avances de la Geofísica y la Ingeniería aplicados a la evaluación del riesgo sísmico

     Lana Pons, Francisco Javier; Caselles Magallon, Jose Oriol; Perez Gracia, Maria de La Vega; Gonzalez Drigo, Jose Ramon; Martínez Santafé, Maria Dolors; Lopez Almansa, Francisco; Serra De Larrocha, Carina; Canas Torres, Jose Antonio; Pujades Beneit, Luis Gonzaga
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  • Archaeological prospection

     Perez Gracia, Maria de La Vega
    Collaboration in journals

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  • Geogaceta

     Perez Gracia, Maria de La Vega
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  • (1478-0771) The international journal of architectural heritage

     Perez Gracia, Maria de La Vega
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  • journal of Archaeology

     Perez Gracia, Maria de La Vega
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  • Journal of geophysics and engineering

     Perez Gracia, Maria de La Vega
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  • Characterization of a Romanesque Bridge in Galicia (Spain)

     Perez Gracia, Maria de La Vega; Di Capua, Daniel; Caselles Magallon, Jose Oriol; Rial, Fernando; Lorenzo, Henrique; Gonzalez Drigo, Jose Ramon; Armesto, Julia
    International journal of architectural heritage
    Date of publication: 2011-04-08
    Journal article

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  • Mejoras en la visualización de señales de radar de subsuelo mediante el análisis frecuencial / OPTIMIZATION OF THE GROUND PENETRATING RADAR IMAGING FROM THE FREQUENCY ANALYSIS

     Santos Assunçao, Sonia Alexandra; Perez Gracia, Maria de La Vega
    Congreso Español de Ensayos No Destructivos
    Presentation's date: 2011-06-16
    Presentation of work at congresses

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  • Correlación entre la nota de ingreso a los estudios de grado de ámbito industrial y los resultados académicos obtenidos en el primer año de estudios de grado

     Lopez Lopez, Jose; Buenestado Caballero, Pablo; Perez Gracia, Maria de La Vega; García Alzórriz, Juan Antonio; Torres Camara, Ricardo; Martinez Sanchez, Joan; Velasco Quesada, Guillermo
    Congreso Universitario de Innovación Educativa en las Enseñanzas Técnicas
    Presentation's date: 2011-07-07
    Presentation of work at congresses

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  • El aprendizaje de competencias: un nuevo reto en la educación superior

     Perez Gracia, Maria de La Vega
    Congrés Internacional de Docència Universitària i Innovació
    Presentation's date: 2011-07-01
    Presentation of work at congresses

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  • Igualdad de oportunidades: diseño, implementación y evaluación de su plan en la EUETIB

     Perez Poch, Antoni; Perez Gracia, Maria de La Vega; Peláez, Sacramento
    Congreso Universitario de Innovación Educativa en las Enseñanzas Técnicas
    Presentation's date: 2011-07-06
    Presentation of work at congresses

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    Sistemas internos de garantía de la calidad (SIGC): necesidad y reto  Open access

     Perez Gracia, Maria de La Vega; Codinas, Xavier; Lopez Lopez, Jose; García Alzórriz, Juan Antonio; Buenestado Caballero, Pablo; Torres Camara, Ricardo; Martinez Sanchez, Joan; Velasco Quesada, Guillermo; Carral Mahia, Mª Eva
    Congreso Universitario de Innovación Educativa en las Enseñanzas Técnicas
    Presentation's date: 2011-07-07
    Presentation of work at congresses

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    La Escuela Universitaria de Ingeniería Técnica Industrial de Barcelona (EUETIB) está diseñando su SIGC propio, teniendo en cuenta las características del centro, las directrices de la Universidad Politécnica de Cataluña y de las agencias de calidad, la formación que se requiere para sus estudiantes y los resultados que se observan en otros centros de éste y de otros países en los que ya se han implantado los sistemas de calidad. En una época de crisis y de cambios, en la que las titulaciones deben adaptarse al Espacio Europeo de Educación Superior (EEES), el diseño de un sistema de calidad deviene una necesidad y un reto para la EUETIB.

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    La evaluación del trabajo en grupo  Open access

     Perez Gracia, Maria de La Vega
    Congreso Universitario de Innovación Educativa en las Enseñanzas Técnicas
    Presentation's date: 2011-07-07
    Presentation of work at congresses

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    En este trabajo se reflexiona acerca de la introducción de las competencias en la enseñanza superior y se muestra un ejemplo de inclusión de una competencia(trabajo en grupo) en los estudios de grado, proponiendo metodologías de evaluación de estas actividades.

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    Radar de subusuelo para el estudio no destructivo de estructuras históricas: ¿Que información aporta?  Open access

     Perez Gracia, Maria de La Vega; Santos Assunçao, Sonia Alexandra; Pujades Beneit, Luis Gonzaga
    Congreso Español de Ensayos No Destructivos
    Presentation's date: 2011-06-15
    Presentation of work at congresses

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    Los ensayos no destructivos en estructuras históricas con radar de subsuelo (GPR) son cada vez más frecuentes. Proporcionan información sobre elementos internos de la estructura, mostrando su situación y, en ocasiones, confirmando su existencia. También permiten definir la distribución de diferentes materiales interiores al medio, como se puede ver en el ejemplo mostrado en este artículo. Aunque su uso habitual es para determinar posición y profundidad de elementos embebidos en un medio, el radar de subsuelo es una herramienta que también se puede utilizar para obtener una información más extensa y detallada de dicho medio. En estudios de patrimonio, un análisis de gran interés es la determinación de sectores afectados por el agua. Además de definir zonas en las que puede haberse presentado un problema de humedad, ¿es posible conocer aproximadamente el contenido de agua presente en un muro o en otras estructuras? En este trabajo se presentan algunos resultados experimentales en los que se analiza la amplitud, la frecuencia y la velocidad de la señal, comparándolos con medidas del contenido de agua y con modelos teóricos. Los resultados parecen indicar que algunos parámetros de la señal que proporciona este método no destructivo puede utilizarse para estimar la humedad del medio.

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    Informe sobre el estudio con GPR realizado en el yacimiento de Puig Ciutat situado en La Torre d¿Oristà (Lluçanès), en la zona Oeste  Open access

     Perez Gracia, Maria de La Vega; Santos Assunçao, Sonia Alexandra
    Date: 2011-06-20
    Report

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    Informe técnico sobre la exploración de un yacimiento arqueológico utilizando un radar de subsuelo con una antena de 25 MHz RTA. Se ha analizado la zona más profunda para determinar las formaciones geológicas someras.

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  • Automation in construction

     Perez Gracia, Maria de La Vega
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  • Journal of archaeological science

     Perez Gracia, Maria de La Vega
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  • International journal of architectural heritage

     Perez Gracia, Maria de La Vega
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  • Técnica Industrial

     Perez Gracia, Maria de La Vega
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  • (0926-9851) Journal of applied geophysics

     Perez Gracia, Maria de La Vega
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  • Earth Science Research Journal

     Perez Gracia, Maria de La Vega
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  • IEEE Journal of Selected Topics in Earth Observations and Remote Sensing

     Perez Gracia, Maria de La Vega
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  • Journal of Geophysics & Remote Sensing

     Perez Gracia, Maria de La Vega
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  • STRUCTURAL ANALYSIS OF MASONRY WALLS USING DIGITAL PHOTOGRAPHY ASSISTED MESH GENERATION

     Di Capua, Daniel; Perez Gracia, Maria de La Vega; Gonzalez Drigo, Jose Ramon
    Revista internacional de métodos numéricos para cálculo y diseño en ingeniería
    Date of publication: 2010
    Journal article

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    Forestry applications of ground-penetrating radar  Open access

     Lorenzo Cimadevila, Henrique; Perez Gracia, Maria de La Vega; Novo, Alex; Armesto, Julia
    Forest Systems (formerly: Investigación agraria: sistemas y recursos forestales)
    Date of publication: 2010
    Journal article

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    Ground-penetrating radar (GPR) is a geophysical and close-range remote sensing technique based on the use of radar pulses to obtain cross-section images of underground features. This method is characterized by the transmission of an electromagnetic short length pulse (1-2 ns), presenting a centre frequency ranging from 10 MHz to 2.5 GHz. The principles of GPR operation are based on the ability of low frequency radar waves to penetrate into a non-conductive medium, usually subsoil, but also walls, concrete or wood. Those waves are detected after suffering a reflection in electromagnetic discontinuities of the propagation medium. Therefore, this is a suitable method to study changes in those physical properties, and also to characterize different mediums and the reflective targets providing information about their physical properties. The aim of this work is to describe and demonstrate different applications of GPR in forestry, showing the obtained results together with their interpretation. Firstly, in this paper, it is illustrated how GPR is able to map shallow bedrock, subsoil stratigraphy and also to estimate shallow watertable depth. Secondly, different tree trunks as well as dry timber are analyzed, evaluating the different radar data obtained in each particular case, and observing differences in their electromagnetic properties related to the GPR response. Finally, several measurements were taken in order to analyze the use of GPR to detect tree root systems using polarimetric techniques, being possible to detect medium and big size roots, together with groups of small roots. Key words: GPR, remote sensing, bedrock, watertable, trunk, root system.

  • Applying the H/V Method to Dense Cities. A Case Study of Valencia City

     Caselles Magallon, Jose Oriol; Perez Gracia, Maria de La Vega; Franklin, R S; Pujades Beneit, Luis Gonzaga; Navarro, M; Clapes Boixader, Jaime; Canas Torres, Jose Antonio; Garcia, F
    Journal of earthquake engineering
    Date of publication: 2010
    Journal article

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  • La experiencia de la EUETIB

     Lopez Lopez, Jose; Torres Camara, Ricardo; Perez Gracia, Maria de La Vega; Buenestado Caballero, Pablo; Garcia-Alzórriz Pardo, Juan Antonio; Martinez Sanchez, Joan
    Evaluación de la Calidad de la Educación Superior y de la Investigación
    Presentation's date: 2010-06-15
    Presentation of work at congresses

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  • GPR Resolution - Lab Data Compared to NDT Evaluations of Structures

     Perez Gracia, Maria de La Vega; Pujades Beneit, Luis Gonzaga; Di Capua, Daniel; Gonzalez Drigo, Jose Ramon; Caselles Magallon, Jose Oriol; Salinas Naval, Victor
    EAGE Conference & Exhibition incorporating SPE EUROPEC 2010
    Presentation's date: 2010-06-15
    Presentation of work at congresses

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    GPR resolution in cultural heritage applications  Open access

     Perez Gracia, Maria de La Vega; Di Capua, Daniel; Gonzalez Drigo, Jose Ramon; Caselles Magallon, Jose Oriol; Pujades Beneit, Luis Gonzaga; Salinas Naval, Victor
    International Conference on Ground Penetrating Radar
    Presentation's date: 2010-06-21
    Presentation of work at congresses

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    The non-destructive study of historical buildings, archaeological sites and other Cultural Heritage structures requires high resolution methodologies and a good knowledge of the potential of the different methods. Laboratory measurements provide valuable information about the ability to detect different targets and to determine structural problems, but these data must be compared to the results obtained in real and complex structures. In this work, we present experimental GPR measurements made in order to determine the spatial resolution under laboratory conditions. These results were compared to the data obtained in different GPR surveys applied to Cultural Heritage. The information obtained in drillings, in visual inspections and in old documentation about the historical buildings and archaeological sites is used to determine the resolution in each case.

  • GPR applications in dense cities: detection of paleochannels and infilled torrents in Barcelona

     Perez Gracia, Maria de La Vega; Caselles Magallon, Jose Oriol; Salinas Naval, Victor; Pujades Beneit, Luis Gonzaga; Clapes Boixader, Jaime
    International Conference on Ground Penetrating Radar
    Presentation's date: 2010-06-25
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  • Automation in construction

     Perez Gracia, Maria de La Vega
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  • Journal of structural geology

     Perez Gracia, Maria de La Vega
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  • NDT & E International

     Perez Gracia, Maria de La Vega
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