0000000000309445

AUTHOR

P. Porta

showing 3 related works from this author

Dependence of the Lattice Parameter of Magnesium Oxide on Crystallite Size

1966

Lattice parameters were measured on MgO specimens prepared in air between 450° and 1200°C. The lattice parameter, a, decreases with increase in preparation temperature, Tp, and with increase in crystallite size. A hydroxide layer is present on the MgO particles. If MgO is prepared in vacuum, a increases as Tp increases and as crystallite size, D, increases. It is concluded that a dilatant volume stress is imposed by the hydroxide layer. It is also shown that the oxide surface reactivity toward water is linked to the deviation from perfect order ensuing from low preparation temperatures.

DilatantMaterials scienceSurface reactivityMagnesiumAnalytical chemistryOxideMineralogychemistry.chemical_elementchemistry.chemical_compoundLattice constantchemistryLattice (order)Materials ChemistryCeramics and CompositesHydroxideCrystalliteJournal of the American Ceramic Society
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LOFT - A large observatory for x-ray timing

2010

The high time resolution observations of the X-ray sky hold the key to a number of diagnostics of fundamental physics, some of which are unaccessible to other types of investigations, such as those based on imaging and spectroscopy. Revealing strong gravitational field effects, measuring the mass and spin of black holes and the equation of state of ultradense matter are among the goals of such observations. At present prospects for future, non-focused X-ray timing experiments following the exciting age of RXTE/PCA are uncertain. Technological limitations are unavoidably faced in the conception and development of experiments with effective area of several square meters, as needed in order to…

High Energy Astrophysical Phenomena (astro-ph.HE)sezeleApplied MathematicsSilicon drift chambersFOS: Physical sciencesComputer Science Applications1707 Computer Vision and Pattern RecognitionCondensed Matter PhysicsCompact sourcesCompact sources; High energy astrophysics; Silicon drift chambers; Timing; X-rays; Electronic Optical and Magnetic Materials; Condensed Matter Physics; Computer Science Applications1707 Computer Vision and Pattern Recognition; Applied Mathematics; Electrical and Electronic EngineeringSettore FIS/05 - Astronomia E AstrofisicaX-raysElectronicTimingOptical and Magnetic MaterialsElectrical and Electronic EngineeringAstrophysics - Instrumentation and Methods for AstrophysicsAstrophysics - High Energy Astrophysical PhenomenaInstrumentation and Methods for Astrophysics (astro-ph.IM)Observatories X-rays Sensors Silicon Physics Polarimetry Electronics Imaging spectroscopyHigh energy astrophysics
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Dalla terra alla mensa attraverso l’arte, fra l’età romana e il Medioevo

2016

Con riferimento a esempi di diverse categorie d’arte – sculture, mosaici, dipinti, miniature – e a fonti letterarie, lo studio contestualizza alcuni aspetti legati all’alimentazione, dal mondo romano al Medioevo. In particolare, attraverso l’analisi di una serie di monumenti (per la parte romana provenienti soprattutto dal territorio nord-orientale della penisola italiana), si tenta di ripercorrere il rapporto tra l’uomo e il cibo intendendolo come un ciclo unitario, dalla ricerca e preparazione degli alimenti fino al loro consumo sulla mensa. Da ciò emerge che la rappresentazione del cibo raramente è fine a se stessa, ma rimanda invece a significati più pregnanti. With reference to example…

Settore L-ANT/07 - Archeologia ClassicaAlimentazione arte romana arte medievale.Food Roman art Medieval art.
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