187,556 research outputs found

    Architetti a Roma: Giuseppe Capponi e altri

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    Architettura moderna a Roma negli anni '30 del Novecento con particoloare riguardo alla figura di Giuseppe Capponi, autore tra l'altro della Facoltà di Botanica alla Città Universitaria

    High-speed imaging of Strombolian explosions: The ejection velocity of pyroclasts

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    Explosive volcanic eruptions are defined as the violent ejection of gas and hot fragments from a vent in the Earth's crust. Knowledge of ejection velocity is crucial for understanding and modeling relevant physical processes of an eruption, and yet direct measurements are still a difficult task with largely variable results. Here we apply pioneering high-speed imaging to measure the ejection velocity of pyroclasts from Strombolian explosive eruptions with an unparalleled temporal resolution. Measured supersonic velocities, up to 405 m/s, are twice higher than previously reported for such eruptions. Individual Strombolian explosions include multiple, sub-second-lasting ejection pulses characterized by an exponential decay of velocity. When fitted with an empirical model from shock-tube experiments literature, this decay allows constraining the length of the pressurized gas pockets responsible for the ejection pulses. These results directly impact eruption modeling and related hazard assessment, as well as the interpretation of geophysical signals from monitoring networks. Citation: Taddeucci, J., P. Scarlato, A. Capponi, E. Del Bello, C. Cimarelli, D. M. Palladino, and U. Kueppers (2012), High-speed imaging of Strombolian explosions: The ejection velocity of pyroclasts, Geophys. Res. Lett., 39, L02301, doi:10.1029/2011GL050404

    Ruggiero, e Bradamante : azione accademica : da rappresentarsi nel giorno natalizio del serenissimo signor principe di Modena nel Ducale Teatro Grande : composta, recitata, e dedicata all'Altezza Serenissima di Rinaldo I., duca di Modena, Reggio, Mirandola, &c. /

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    "Rime per la felicissima nascita del serenisimo principino d'Este, compiste, e dedicate all' Altezza Serenissima di Rinaldo I., duca di Modena, Reggio, Mirandola, &c., da signori convittori del Collegio de' Nobili di Modena"--P. [37]-67.Signatures: pi² A-I⁴ K⁴(-K4).Mode of access: Internet.Library's copy bound with: Il valore magnanimo d'Alessandro nella sconfitta del re Porro. Modena : Antonio Capponi, 1722 (94-B19419
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