Exploració per tema "Geofísica"

Ara es mostren els items 41-60 de 172

    • Discrete empirical interpolation for hyper-reduction of hydro-mechanical problems in groundwater flow through soil 

      Nasika, Christina; Díez, Pedro; Gerard, Pierre; Massart, Thierry J.; Zlotnik, Sergio (2023-04-10)
      Article
      Accés obert
      The recent surge in the availability of sensor data and computational resources has fostered the development of technologies for optimization, control, and monitoring of large infrastructures, integrating data and numerical ...

    • Diseño de un indicador de apoyo a la gestíón de firmes basado en el Ground Penetrating Radar: análisis de la forma del espectro de onda de GPR como indicador de estado de firmes asfálticos 

      Pedret Rodés, Josep (Universitat Politècnica de Catalunya, 2017-02-16)
      Tesi
      Accés obert
      The Ground Penetrating Radar test applied to road engineering is overall used to determine the geometric characteristics of the pavement structure by analyzing the wave in the time domain. On many cases, it is often used ...

    • Distribution and mitigation of higher-order ionospheric effects on precise GNSS processing 

      Hernández Pajares, Manuel; Aragón Ángel, María Ángeles; Defraigne, Pascale; Bergeot, Nicolas; Prieto Cerdeira, Roberto; García Rigo, Alberto (2014-04)
      Article
      Accés obert
      Higher-order ionospheric effects (I2+) are one of the main limiting factors in very precise Global Navigation Satellite Systems (GNSS) processing, for applications where millimeter accuracy is demanded. This paper summarizes ...

    • Edge-based parallel framework for the simulation of 3d CSEM surveys 

      Castillo Reyes, Octavio; de la Puente, Josep; Puzyrev, Vladimir; Cela, José M. (Society of Exploration Geophysicists and American Association of Petroleum Geologists, 2016)
      Comunicació de congrés
      Accés obert

    • Edge-elements for geophysical electromagnetic problems: a new implementation challenge 

      Castillo Reyes, Octavio; de la Puente, Josep; Puzyrev, Vladimir; Cela, José M. (2015-05)
      Comunicació de congrés
      Accés obert

    • Edge-elements formulation of 3D CSEM in geophysics : a parallel approach 

      Castillo Reyes, Octavio (Universitat Politècnica de Catalunya, 2017-10-23)
      Tesi
      Accés obert
      Electromagnetic methods (EM) are an invaluable research tool in geophysics whose relevance has increased rapidly in recent years due to its wide industrial adoption. In particular, the forward modelling of three-dimensional ...

    • Electron density extrapolation above F2 peak by the linear Vary-Chap model supporting new Global Navigation Satellite Systems-LEO occultation missions 

      Hernández Pajares, Manuel; García Fernández, Miquel; Rius Carrasco, Antoni; Notarpietro, Riccardo; von Engeln, Axel; Olivares Pulido, Germán; Aragón Ángel, Maria Angeles; García Rigo, Alberto (2017-08)
      Article
      Accés obert
      The new radio-occultation (RO) instrument on board the future EUMETSAT Polar System-Second Generation (EPS-SG) satellites, flying at a height of 820 km, is primarily focusing on neutral atmospheric profiling. It will also ...

    • Estimation of the advection effects induced by surface heterogeneities in the surface energy budget 

      Cuxart Rodamillans, Joan; Wrenger, Burkhard; Martínez Villagrasa, Daniel; Reuder, Joachim; Jonassen, Marius O.; Jiménez Cortés, Maria Antonia; Lothon, Marie; Lohou, Fabienne; Hartogensis, Oscar; Dünnermann, Jens; Conangla Triviño, Laura; Garai, Anirban (2016-07-29)
      Article
      Accés obert

    • Exploring stratospheric dynamics with lagrangian tools: effect of uncertainties in data 

      Alcalde Zafra, Albert (Universitat Politècnica de Catalunya, 2023-06)
      Projecte Final de Màster Oficial
      Accés obert
      Lagrangian Coherent Structures (LCSs) are geometric boundaries in fluid flows that are used to understand the organization and transport of fluid particles. In this Master's thesis, we use Lagrangian Descriptors, an LCSs ...

    • Extended triple collocation: estimating errors and correlation coefficients with respect to an unknown target 

      McColl, Kaighin Alexander; Vogelzang, Jur; Konings, Alexandra G.; Entekhabi, Dara; Piles Guillem, Maria; Stoffelen, Ad (2014-09-16)
      Article
      Accés obert
      Calibration and validation of geophysical measurement systems typically require knowledge of the true value of the target variable. However, the data considered to represent the true values often include their own measurement ...

    • Faraday rotation angle retrieval using SMOS radiometric data 

      Wu, Lin; Corbella Sanahuja, Ignasi; Torres Torres, Francisco; Duffo Ubeda, Núria; Martín Neira, Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      SMOS radiometric data is used to derive Faraday rotation for a number of orbits combining several scenarios: land, ice and water. Results compare very well with the values theoretically predicted from available ionosphere ...

    • Feasibility of GNSS-R ice sheet altimetry in Greenland using TDS-1 

      Rius, Antonio; Cardellach, Estel; Fabra Cervellera, Fran; Li, Weiqiang; Ribó Vedrilla, Serni; Hernández Pajares, Manuel (2017-07-19)
      Article
      Accés obert
      Radar altimetry provides valuable measurements to characterize the state and the evolution of the ice sheet cover of Antartica and Greenland. Global Navigation Satellite System Reflectometry (GNSS-R) has the potential to ...

    • Galileo characterization as Input to H-ARAIM and SBAS DFMC 

      Brieden, Phillip; Wallner, Stefan; Sanz Subirana, Jaume; Rovira Garcia, Adrià; Alonso Alonso, María Teresa; Baur, Oliver; Lauria, Domenico; Kirchner, Michael; Cosson, Fabrice; Spinelli, Enrico; Martini, Ilaria (2019)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The characterization of Galileo Open Service signal-in-space (SiS) represents an essential input to Safety-of-Life (SoL) applications like Horizontal ARAIM (Advanced Receiver Autonomous Integrity Monitoring) and SBAS ...

    • Gauss y la geodesia : un paseo por los mapas 

      González, Sergio (2006-03-29)
      Audiovisual
      Accés obert
      Un breve resumen de las enormes contribuciones de Gauss al desarrollo de la topografía, la astronomía y la geodesia: instrumentos de observación, métodos de observación, métodos de cálculo, sistemas de representación... ...

    • Generation of precise wide-area geocoded elevation models with ERS SAR data 

      Bara, M; Romero, Matilde E. de; Mora, O; Broquetas Ibars, Antoni (Institute of Electrical and Electronics Engineers (IEEE), 1999)
      Text en actes de congrés
      Accés obert
      The authors present an improved technique for the generation of digital elevation models (DEM), capable of dealing with full scene images (100×100 km) coming from an interferogram obtained with ERS satellite data. Starting ...

    • Generation of proxy GIM-TEC for extreme storms before the Era of GNSS observations 

      Gulyaeva, Tamara L.; Shubin, Valentin; Haralambous, Haris; Hernández Pajares, Manuel; Stanislawska, Iwona (John Wiley & sons, 2022-01)
      Article
      Accés obert
      For the first time, we reconstructed global distribution of both the total electron content disturbance W index and TEC values for eight extreme storms (Dst < -250 nT) occurred before the epoch of GNSS observations in solar ...

    • Georradar aplicado a la arqueología: el Palacio del Real de Valencia 

      Broseta Gutiérrez, Raúl (Universitat Politècnica de Catalunya, 2010-06)
      Projecte/Treball Final de Carrera
      Accés obert
      El presente trabajo se enmarca dentro los trabajos previos a las excavaciones arqueológicas llevadas a cabo en el año 2009 del Palacio del Real de Valencia. En él se usa la técnica geofísica no intrusiva del georradar ...

    • Geostatistics for functional data: an ordinary kriging approach 

      Giraldo, Ramón; Delicado Useros, Pedro Francisco; Mateu, Jorge (2007-06-11)
      Article
      Accés obert
      We present a methodology to perform spatial prediction when measured data are curves. In particular, we propose both an estimator of the spatial correlation and a functional kriging predictor. We adapt an optimization ...

    • Ghost-arc geochemical anomaly at a spreading ridge caused by supersized flat subduction 

      Gianni, Guido M.; Likerman, Jeremías; Navarrete Granzotto, César Rodrigo; Gianni, Conrado R.; Zlotnik, Sergio (2023-04-12)
      Article
      Accés obert
      The Southern Atlantic-Southwest Indian ridges (SASWIR) host mid-ocean ridge basalts with a residual subduction-related geochemical fingerprint (i.e., a ghost-arc signature) of unclear origin. Here, we show through an ...

    • Global monitoring of ionospheric weather by GIRO and GNSS data fusion 

      Galkin, Ivan; Fron, Adam; Reinisch, Bodo W.; Hernández Pajares, Manuel; Krankowski, Andrzej; Nava, Bruno; Bilitza, Dieter; Kotulak, Kacper; Flisek, Pawel; Li, Zishen; Wang, Ningbo; Roma Dollase, David; García Rigo, Alberto; Batista, Inez (2022-02-23)
      Article
      Accés obert
      Prompt and accurate imaging of the ionosphere is essential to space weather services, given a broad spectrum of applications that rely on ionospherically propagating radio signals. As the 3D spatial extent of the ionosphere ...