1,826,219 research outputs found
Long-wavelength Pol-InSAR for glacier ice extinction estimation
No full textIn recent years there has been increased interest in using synthetic aperture radar (SAR) to study and monitor glaciers for climate change research. This paper describes the estimation of ice extinctions through modelling of Pol-InSAR (polarimetric interferometric SAR) coherences as a combination of a surface contribution (from the snow-firn interface and wind-induced features) and a volume response. Ground-to-volume scattering ratios derived from a novel polarimetric decomposition are used in conjunction with Pol-InSAR interferometric coherence magnitudes to invert the extinction of the ice layer. The inversion is performed with experimental airborne Pol-InSAR data at L- and P-band collected using DLR's E-SAR system over the Austfonna ice cap in Svalbard, Norway as part of the 2007 ICESAR campaign. Extinction-dependencies on frequency and glacier zone are investigated, and validation is performed comparing P-band sounder data to inverted extinction values
Diego Pol (Paleontólogo - CONICET)
No full textDiego Pol, Paleontólogo del CONICET, trabaja en El Tranquilo, provincia de Santa Cruz, estudiando restos fósiles de reptiles arcosaurios (como dinosaurios y cocodrilos
Forcing, damping and detuning for single and coupled Van der Pol oscillators
No full textWe use Melnikov function techniques together with geometric methods of bifurcation theory to study the interactions of forcing, damping and detuning on resonant periodic orbits for single and coupled forced Van Der Pol oscillators. For a coupled pair the local bifurcation geometry is almost everywhere described in terms of the singularities of a line congruence in three dimensions
Obertura de la II Jornada-Col·loqui Miquel Martí i Pol de Literatura i Educació (23 i 24 de novembre de 2018: Girona)
No full textActe de presentació i benvinguda institucional de la 'II Jornada-Col·loqui Miquel Martí i Pol' a càrrec de Margarida Casadevall, de Josep Calbó, vicerector de projectes estratègics de la UdG i de Ramon Besora, president de l'Associació d'Amics Miquel Martí i Pol i patró de la Fundació Miquel Martí i Pol5462.mp4
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Extinction estimation over land ice using long-wavelength Pol-InSAR
No full textIn recent years there has been increased interest in using SAR to study and monitor glaciers and ice sheets for glaciological and climate change research. This paper describes for the first time the estimation of ice extinction through the modelling of Pol-InSAR coherences as a combination of a surface contribution from the snow-ice interface and a volume response. Separation of the ground and volume contributions is obtained through decomposition of the polarimetric coherency matrix. Both model-based Freeman 2- and 3-component and eigenvector decompositions are examined. Ground-to-volume scattering ratios derived from polarimetry are used in conjunction with Pol-InSAR interferometric coherences to invert the extinction of the ice layer. Validation is performed with airborne Pol-InSAR data at L- and P-band collected using DLR's E-SAR system over the Austfonna ice cap in Svalbard, Norway as part of the ICESAR campaign
Laurel FULKERSON, The Ovidian Heroine as Author. Reading, Writing, and Community in the Heroides.
No full textTordeur Pol. Laurel FULKERSON, The Ovidian Heroine as Author. Reading, Writing, and Community in the Heroides. . In: L'antiquité classique, Tome 76, 2007. p. 332
Laurel FULKERSON, The Ovidian Heroine as Author. Reading, Writing, and Community in the Heroides.
No full textTordeur Pol. Laurel FULKERSON, The Ovidian Heroine as Author. Reading, Writing, and Community in the Heroides. . In: L'antiquité classique, Tome 76, 2007. p. 332
Tony Woodman et Jonathan Powell (Ed.), Author and Audience in Latin Literature
No full textTordeur Pol. Tony Woodman et Jonathan Powell (Ed.), Author and Audience in Latin Literature. In: L'antiquité classique, Tome 63, 1994. pp. 382-383
Characterisation of oriented volumes in glacier ice and extinction inversion with Pol-InSAR
No full textIn recent years there has been increased interest in using SAR to study and monitor glaciers and ice sheets for glaciological and climate change research. This paper describes the estimation of ice extinctions through the modelling of Pol-InSAR coherences as a combination of a surface contribution from the snow-ice interface and a volume response from an oriented particle cloud. Separation of the ground and volume contributions is obtained using a novel decomposition of the polarimetric covariance matrix which allows for preferential particle orientations and accounts for the influence of the dielectric constants of ice and snow. Ground-to-volume scattering ratios derived from polarimetry are used in conjunction with Pol-InSAR interferometric coherences to invert the extinction of the ice layer. Validation is performed with airborne Pol-InSAR data at L- and P-band collected using DLR's E-SAR system over the Austfonna ice cap in Svalbard, Norway as part of the ICESAR campaign
Entrevista a Pol Codorniu
No full textEntrevista a Pol Codorniu, treballador a ENASA (Pegaso) des de 1983. Analitza les diferències sindicals en altres empreses on va treballar i la situació sindical a ENASA (Pegaso). Explica com va viure la seva activitat sindical des del camp tècnic i valora la seva trajectòria a la fàbrica
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