Publications

Displaying 1201 - 1225 of 1351

Publication	Date
Jupiter's 24° N highest speed jet: Vertical structure deduced from nonlinear simulations of a large-amplitude natural disturbance Authors: Agustín Sánchez-Lavega,Timothy E. Dowling,Enrique Garcia-Melendo Abstract The evolution of a large-amplitude disturbance at cloud level in Jupiter's 24° N jet stream in 1990 is used to constrain the vertical structure of a realistic atmospheric model down to the 6 bar pressure level. We use the EPIC model (Dowling et al., 1998, The explicit planetary… Elsevier BV	2005-08-01
Parallel Implementation of EDAs Based on Probabilistic Graphical Models Authors: Jose A. Lozano,Alexander Mendiburu,Jose Miguel-Alonso This paper proposes new parallel versions of some estimation of distribution algorithms (EDAs). Focus is on maintenance of the behavior of sequential EDAs that use probabilistic graphical models (Bayesian networks and Gaussian networks), implementing a master-slave workload distribution for the… Institute of Electrical and Electronics Engineers (IEEE)	2005-08-01
Saturn's cloud structure and temporal evolution from ten years of Hubble Space Telescope images (1994–2003) Authors: Agustín Sánchez-Lavega,Richard G. French,Santiago Pérez-Hoyos,Jose Félix Rojas Abstract We present a study of the vertical structure of clouds and hazes in the upper atmosphere of Saturn's Southern Hemisphere during 1994–2003, about one third of a Saturn year, based on Hubble Space Telescope images. The photometrically calibrated WFPC2 images cover the spectral region… Elsevier BV	2005-07-01
Editorial Authors: Iñaki Inza,Pedro Larrañaga,Jose A. Lozano,Jose M. Peña Springer Science and Business Media LLC	2005-06-01
Influence of age and gender on quality-of-life outcomes after cholecystectomy Authors: V. Oribe,B. Barrios,I. Garay,Inmaculada Arostegui,José M. Quintana,I. López de Tejada Few studies have assessed the role of sociodemographic characteristics on outcomes after a cholecystectomy. Our goal was to evaluate the influence of age and gender on the health related quality of life (HRQoL) changes after cholecystectomy in this prospective observational study of consecutive… Springer Science and Business Media LLC	2005-04-01
Translation and psychometric testing of the Basque version of the SF-36 Health Survey Authors: I. Crespo,Angel Padierna,Inmaculada Arostegui,Nerea González,M. A. Vesga,José M. Quintana,E. Martínez The primary goals of this study were to adapt the Short Form-36 (SF-36) questionnaire to the Basque language and to assess the translated questionnaire's psychometric properties.Two pilot studies and a field study were conducted in 1999. The pathologies selected were hypertension, eating disorders… Springer Science and Business Media LLC	2005-03-01
Jupiter's cyclones and anticyclones vorticity from Voyager and Galileo images Authors: Agustín Sánchez-Lavega,Jon Legarreta Abstract We have measured the internal velocity field in jovian synoptic-scale cyclones and anticyclones by tracking cloud elements in very high spatial resolution images obtained by the Voyager 1 and 2 (in 1979) and Galileo (1996–2000) spacecrafts. In total we have studied 24 different closed… Elsevier BV	2005-03-01
Editorial Introduction Special Issue on Estimation of Distribution Algorithms Authors: Jose A. Lozano,P. Larra Naga MIT Press - Journals	2005-03-01
How Long Is the Day on Saturn? Authors: Agustín Sánchez-Lavega Determining a planet's rotation period can be difficult if the planet lacks a solid surface. However, for planets with an internal magnetic field, emissions at radio wavelengths are modulated by the planet's rotation rate. The latest results from the Cassini spacecraft seem to indicate that Saturn'… American Association for the Advancement of Science (AAAS)	2005-02-25
Comparison of GPS/SAC-C and MIPAS/ENVISAT Temperature Profiles and Its Possible Implementation for EOS MLS Observations Authors: Jiang, J. H.,Wang, D. Y.,Romans, L. J.,Ao, C. O.,Schwartz, M. J.,Stiller, G. P.,Clarmann, T. von,Lopez-Puertas, M.,Funke, B.,Gil-Lopez, S.,Glatthor, N.,Grabowski, U.,Höpfner, M.,Kellmann, S.,Kiefer, M.,Linden, A.,Mengistu Tsidu, G.,Milz, M.,Steck, T.,… This analysis presents comparisons of the atmospheric temperatures retrieved from GPS/SAC-C radio occultation observations using the JPL retrieval software, and from MIPAS/ENVISAT infrared spectrum measurements using the IMK data processor. Both individual profiles and zonal means of the… Springer Berlin Heidelberg	2005-01-01
A variable step size LMS algorithm for the suppression of the CPR artefact from a VF signal Authors: A. Lazkano,Elisabete Aramendi,Unai Irusta,Jesus Ruiz,José Julio Gutiérrez,S.R. de Gauna Artefacts created by thoracic compressions during cardiopulmonary resuscitation (CPR) prevent the proper classification of the cardiac rhythm by an automatic external defibrillator (AED), making a pause in CPR necessary for a correct rhythm analysis. Previously proposed adaptive filtering methods… IEEE	2005-01-01
Comparisons of MIPAS/ENVISAT and GPS-RO/CHAMP Temperatures Authors: Wang, D. Y.,Wickert, J.,Stiller, G. P.,Clarmann, T. von,Beyerle, G.,Schmidt, T.,Lopez-Puertas, M.,Funke, B.,Gil-Lopez, S.,Glatthor, N.,Grabowski, U.,Höpfner, M.,Kellmann, S.,Kiefer, M.,Linden, A.,Mengistu Tsidu, G.,Milz, M.,Steck, T.,Fischer, H. The temperatures retrieved from MIPAS/ENVISAT limb mid-infrared emission and CHAMP GPS radio occultation measurements are compared at altitudes between 8 – 30 km during the stratospheric major sudden warming in the southern hemisphere winter of 2002. The mean differences between the correlative… Springer Berlin Heidelberg	2005-01-01
Cross comparisons of O3 and NO2 measured by the atmospheric ENVISAT instruments GOMOS, MIPAS, and SCIAMACHY Authors: Horst Fischer,C. von Savigny,Mark Weber,Andrea Linden,Norbert Glatthor,D. Y. Wang,Astrid Bracher,Martin Kaufmann,G. Mengistu Tsidu,Manuel López-Puertas,J. Skupin,Klaus Bramstedt,Vladimir Rozanov,T. Steck,Michael Höpfner,Sergio Gil-Lopez,Mathias Milz,Kai-… Vertical profiles of O3 and NO2 abundances from the atmospheric instruments GOMOS (Global Ozone Monitoring by the Occultation of Stars), MIPAS (Michelson Interferometer for Passive Atmospheric Sounding) and SCIAMACHY (Scanning Imaging Spectrometer for Atmospheric Chartography) all on-board the… Elsevier BV	2005-01-01
A simple effective filtering method for removing CPR caused artefacts from surface ECG signals Authors: Elisabete Aramendi,Unai Irusta,S.R. de Gauna,Jesus Ruiz,A. Lazkano,José Julio Gutiérrez Cardiopulmonary Resuscitation (CPR) introduces strong interference on the surface ECG, corrupting any diagnosis of the cardiac rhythm. In this work a filtering method is proposed to remove the CPR artefact from Ventricular Fibrillation (VF) signals. It is a notch filter adapted to the fundamental… IEEE	2005-01-01
ON THE PERFORMANCE OF ESTIMATION OF DISTRIBUTION ALGORITHMS APPLIED TO SOFTWARE TESTING Authors: Ramón Sagarna,Jose A. Lozano Informa UK Limited	2005-01-01
CPR artefact removal from VF signals by means of an adaptive kalman filter using the chest compression frequency as reference signal Authors: José Julio Gutiérrez,S.R. de Gauna,Elisabete Aramendi,A. Lazkano,Unai Irusta,Jesus Ruiz Chest compressions during Cardiopulmonary Resuscitation (CPR) generate important artefacts which impede the correct analysis of the ECG signal by an automated external defibrillator (AED). The suppression of the CPR artefact is thus necessary during resuscitation. The filtering technique proposed… IEEE	2005-01-01
Health-Related Quality of Life and Appropriateness of Cholecystectomy Authors: José Ma Quintana,Mercedes Varona,Inmaculada Arostegui,Luis Perdigo,Amaia Bilbao,José Luis Cabriada,Victor Oribe To evaluate the relationship among appropriateness of the use of cholecystectomy and outcomes.The use of cholecystectomy varies widely across regions and countries. Explicit appropriateness criteria may help identify suitable candidates for this commonly performed procedure. This study evaluates… Ovid Technologies (Wolters Kluwer Health)	2005-01-01
An analytical proof of Hardy-like inequalities related to the Dirac operator Authors: Loss, Michael,Esteban, Maria J.,Dolbeault, Jean,Vega, Luis We prove some sharp Hardy type inequalities related to the Dirac operator by elementary, direct methods. Some of these inequalities have been obtained previously using spectral information about the Dirac-Coulomb operator. Our results are stated under optimal conditions on the asymptotics of the… Elsevier BV	2004-11-01
A real space method for averaging lemmas Authors: Luis Vega,Pierre Emmanuel Jabin AbstractWe introduce a new method to prove averaging lemmas, i.e., prove a regularizing effect on the average in velocity of a solution to a kinetic equation. The method does not require the use of Fourier transform and the whole procedure is performed in the ‘real space’. We are consequently able… Elsevier BV	2004-11-01
A three-dimensional model of moist convection for the giant planets II: Saturn's water and ammonia moist convective storms Authors: Ricardo Hueso,Agustín Sánchez-Lavega Abstract Moist convective storms constitute a key aspect in the global energy budget of the atmospheres of the giant planets. Among them, Saturn is known to develop the largest scale convective storms in the Solar System, the Great White Spots (GWS) which occur rarely and have been detected once… Elsevier BV	2004-11-01
Appropriateness variation in cholecystectomy Authors: José M. Quintana,José Luis Cabriada,Idoia Garay,Amaia Bilbao,Ignacio López De Tejada,Luis Perdigo,Inmaculada Arostegui Cholecystectomy use varies moderately across regions and countries. The purpose of this study was to evaluate the appropriateness of the use of cholecystectomy in patients with nonmalignant diseases in different hospitals using explicit criteria developed by an expert panel.Patients on waiting… Oxford University Press (OUP)	2004-09-01
Self-similar solutions of the localized induction approximation: singularity formation Authors: Susana Gutiérrez,Luis Vega 60 pages, 8 figures IOP Publishing	2004-08-07
Saturn's cloud morphology and zonal winds before the Cassini encounter Authors: Ricardo Hueso,Agustín Sánchez-Lavega,Richard G. French,Jose Félix Rojas,Santiago Pérez-Hoyos Abstract Analyses of Hubble Space Telescope (HST) images of Saturn obtained from August 2003 to March 2004, with extensive support from ground-based telescopes, have been used to characterize the cloud morphology and motions in its atmosphere few months before the Cassini encounter. We present… Elsevier BV	2004-08-01
The Cauchy problem for quasi-linear Schr�dinger equations Authors: Carlos E. Kenig,Luis Vega,Gustavo Ponce with x ∈ Rn, t ∈ R with ∇ = (∂x1, .., ∂xn) and summation convention. One may think of the equation in (1.1) as a non-linear Schrodinger equation where the operator modeling the dispersion relation is non-isotropic and depends also on the unknown function, its conjugate and their gradients in the… Springer Science and Business Media LLC	2004-06-09
The Magnetic Field in Giant Extrasolar Planets Authors: Agustín Sánchez-Lavega We study the internal structure and the convective motions of giant extrasolar planets in order to calculate their dynamo-generated surface magnetic field and dipolar magnetic moment. Using evolutionary models, we investigate the existence of magnetism in planets with masses ranging from 0.3MJ to… American Astronomical Society	2004-06-08