1,722,270 research outputs found
Fully frustrated Josephson junction ladders with Mobius boundary conditions as topologically protected qubits
No full textWe show how to realize a “protected” qubit by using a fullyfrustratedJosephsonjunctionladder (JJL) with Mobiusboundaryconditions. Such a system has been recently studied within a twisted conformal field theory (CFT) approach [G. Cristofano, G. Maiella, V. Marotta, Mod. Phys. Lett. A 15 (2000) 1679; G. Cristofano, G. Maiella, V. Marotta, G. Niccoli, Nucl. Phys. B 641 (2002) 547] and shown to develop the phenomenon of flux fractionalization [G. Cristofano, V. Marotta, A. Naddeo, G. Niccoli, Eur. Phys. J. B 49 (2006) 83]. The relevance of a “closed” geometry has been fully exploited in relating the topological properties of the ground state of the system to the presence of half flux quanta and the emergence of a topological order has been predicted [G. Cristofano, V. Marotta, A. Naddeo, J. Stat. Mech.: Theory Exp. (2005) P03006]. In this Letter the stability and transformation properties of the ground states under adiabatic magnetic flux change are analyzed and the deep consequences on the realization of a solid state qubit, protected from decoherence, are presented
Transport Properties in Bilayer Quantum Hall Systems in the Presence of a Topological DefectAIP Conference Proceedings
No full textFort Apollonia
No full textIl Fort Apollonia Museum of Nzema Culture and History (Western Region, Ghana) costituisce un esperimento di museografia collaborativa che affonda le sue radici in oltre cinquant’anni di ricerche etnografiche in area nzema dellla Missione Etnologica Italiana in Ghana, e inaugura forme inedite di restituzione fondate sulla relazione e sulla condivisione
Validation of free surface vortex analytical models
No full textDuring the last fifty years, several studies have been performed on free surface vortex formation and evolution, and different analytical models have been developed. In a previous work, three different models were analyzed and discussed to evaluate limits and strong points of each one. In this paper the same three models have been considered and compared with experimental results obtained for different horizontal planes by means of Particles Image Velocimetry technique. Mean velocity fields have been measured and discussed for each test case, highlighting the vortex flow field differences at different heights and flow rates. Experimental results have been compared with three analytical vortex models in terms of tangential velocity and vorticity profiles; two parameters needed by the models - the circulation and the vortex core radius - are derived from the experiments. Further considerations on the circulation distribution in axial and radial directions are included
Influence of boundary conditions in numerical simulation of free surface vortices
No full textA numerical evaluation of gas core length in free surface vortices had been performed, applying different approaches. In the past only partial satisfactory agreement with experimental results was obtained because of an excessive simplification of the computational domain. In this work, two-phase CFD simulations (with Volume Of Fluid method) have been performed using a computational domain without any simplification and the evolution of the vortex formation has been analyzed in term of gas core length. Different turbulence models have been tested. A mesh sensitivity analysis has been performed. The new numerical results obtained with the most advanced turbulence model (SST SAS-CC) show an improved agreement with experimental data, with respect to the previous results, confirming the importance of imposing proper boundary conditions to correctly simulate free surface vortices
Intervista a Mariano Pavanello.
No full textAlla vigilia del processo di musealizzazione che avrebbe protato alla realizzazione del Fort Apollonia Museum of Nzema Culture and History, gli autori intervistano Mariano Pavanello, direttore della MEIG - Missione Etnologica Italiana in Ghana dal 1989 al 2013
Per l’edizione dei Cantari sulla ‘Legenda aurea’ di Cristofano Guidini (Rieti, Bibl. Paroniana, I.2.45)
No full textThe essay is the first critical analysis of the collection of cantari on the Legenda aurea preserved in the cod. Rieti, Bibl. Paroniana, ms. I.2.45 and attributed to one of Catherine of Siena’s disciples, Cristofano di Gano Guidini. After a preliminary study of the sylloge and its author, we offer an essay on the edition containing the only extant texts, respectively at the beginning and at the end of the collection (I. Di santo Andrea; LXXXII. De santa Caterina). The texts are accompanied by some remarks on their sources and metrics
UTILIZZO DI STENT AUTOMODELLANTI ALLIUM NEL TRATTAMENTO DELLE STENOSI DELLE VIE URINARIE
No full textl'apparato urinario svolge nel suo complesso una funzione emuntoria; lo stent è uno strumento utilizzato per prevenire o risolvere rapidamente un'ostruzione delle alte vie urinarie. gli stent DJ sono la via convenzionale per risolvere le stenosi ureterali; lo stent allium è un endoprotesi autoespandibile
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