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    ABSTRACT: 6) Norwegian Institute for Air Research, Kjeller, Norway, (7) Institute of Applied Physics, Bern, Switzerland, (8) Deutscher Wetterdienst, Hohenpeissenberg, Germany, (9) Central Aerological Observatory, Moscow, Russia, (10) Alfred Wegener Institute for Polar and Marine Research, (16) Institute of Meteorology and Water Management, Warsaw, Poland, (17) ESA-ESRIN, Via Galileo Galilei, I-00044 Frascati, Italy, (18) Belgian Inst. for Space Aeronomy (BIRA), Avenue Circulaire 3, Bruxelles, Belgium, (19) Jet Propulsion Laboratory, Wrightwood (CA), USA (22) Royal Meteorological Institute (RMI), Ringlaan 3, Brussels B-1180, Belgium, (23) Meteo Swiss, Payerne, Switzerland, (24 ABSTRACT One of the nine instruments on-board the polar-orbiting environmental satellite ENVISAT is the Global Ozone Monitoring by Occultation of Stars (GOMOS) instrument. This paper presents validation results of GOMOS ozone profiles (v6.0a) from comparisons to microwave radiometer, balloon ozonesonde and lidar measurements worldwide. Thirty-one instruments/ launch-sites at twenty-five stations ranging from the Arctic to the Antarctic joined in this activity. We identified 3,713 useful collocated observations that were performed within an 800-km radius and a maximum 20-hours time difference of a satellite observation, for the period June 2002 and March 2003. These collocated profiles were compared and the results were analyzed for possible dependencies on several geophysical (e.g., latitude) and GOMOS observational (e.g., star characteristics) parameters. In a dark atmospheric limb the GOMOS data agree very well with the correlative data and between 20-to 61-km altitude their differences only show a small (2.5%) insignificant negative bias with a standard deviation of about 14%. This conclusion is demonstrated to be independent of the star temperature and magnitude, and the latitudinal region of the GOMOS observation.
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    ABSTRACT: We present a mechanical model— a growing spherical shell—suitable for predicting the evolution of a Saccular Cerebral Artery Aneurysms (SCAA). It relies basically on the Kröner-Lee decomposition, used to describe the interplay between the current and the relaxed configuration of body elements. Rupture or stabilization of a SCAA are the end effect of a number of biological mechanisms, still poorly understood. We propose a model based on three competing remodeling mechanisms— one passive and two active. Despite drastic simplifying assumptions, preliminary numerical experiments attest to the potential of our model to account for nontrivial evolutions en-suing from accidental perturbations of a homeostatic state.
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    ABSTRACT: A direct nonlinear 1-dimensional model of elastic, thin-walled, planar beam is formulated. The model accounts for changes in shape of the cross-section, in particular the ovalization (or flattening) occurring in tubular beams. The deformation of the cross-section is described in the spirit of the Generalized Beam Theory, as a linear combination of known deformation modes and unknown amplitude functions, said distortions. Kinematics calls for introducing distortional and bi-distortional strains, in addition to the usual strain measures of rigid cross-section beams. The balance equations are derived through the Virtual Power Principle, in which distortional and bi-distortional stresses, as well as distortional forces, are defined as conjugate quantities of distortional strain-rates and velocities, respectively. A nonlinear, fully coupled, hyperelastic law is assumed. All the distortional quantities and the constitutive law are identified, via energy equalities, from a three-dimensional fiber-model of thin-walled beam where, for simplicity, just a distortion mode is considered. The model is specialized to a Euler-Bernoulli tubular beam, in which only constitutive nonlinearities are retained, while kinematics is linearized. The relevant nonlinear equations are solved, via a perturbation method, for several static loadings and for large-amplitude free vibrations. The interaction occurring between global bending and cross-section distortion is analyzed.
    International Journal of Non-Linear Mechanics 11/2014; 66. DOI:10.1016/j.ijnonlinmec.2014.03.008


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    Via G. Falcone, I 67100, L'Aquila, Italy
  • Head of Institution
    Paola Inverardi
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