3,217 research outputs found
L'inquisizione e i calabro-valdesi / Filippo De Boni
No full textL'inquisizione e i calabro-valdesi / Filippo De Boni
Milano : G. Daelli e C., 1864
XX, 146 p. ; 16 cm
Quadrature Rules in the Isogeometric Galerkin Method: State of the Art and an Introduction to Weighted Quadrature
No full textIn this paper we introduce the quadrature needed in the IsoGeometric
Galekin method. Quadrature rules affect the cost of the assembly of the discrete
counterpart of the IgA method, so that the search for efficient quadrature is an active
research topic. The focus of the first part is on a brief survey on the contributions
available for the reduction of computational costs for such issue. We review the
Generalized gaussian strategies and the reduced quadrature introduced. Then we
present the novelty of weighted quadrature, recently proposed by Calabro, Sangalli `
and Tani for the efficient assembly. We detail the construction of such rules and
give some examples. Finally we end with some remark on current work and further
developments
First operation with the JET International Thermonuclear Experimental Reactor-like wall
No full textTo consolidate International Thermonuclear Experimental Reactor (ITER) design choices and prepare for its operation, Joint European Torus (JET) has implemented ITER's plasma facing materials, namely, Be for the main wall and W in the divertor. In addition, protection systems, diagnostics, and the vertical stability control were upgraded and the heating capability of the neutral beams was increased to over 30 MW. First results confirm the expected benefits and the limitations of all metal plasma facing components (PFCs) but also yield understanding of operational issues directly relating to ITER. H-retention is lower by at least a factor of 10 in all operational scenarios compared to that with C PFCs. The lower C content (≈ factor 10) has led to much lower radiation during the plasma burn-through phase eliminating breakdown failures. Similarly, the intrinsic radiation observed during disruptions is very low, leading to high power loads and to a slow current quench. Massive gas injection using a D2/Ar mixture restores levels of radiation and vessel forces similar to those of mitigated disruptions with the C wall. Dedicated L-H transition experiments indicate a 30% power threshold reduction, a distinct minimum density, and a pronounced shape dependence. The L-mode density limit was found to be up to 30% higher than for C allowing stable detached divertor operation over a larger density range. Stable H-modes as well as the hybrid scenario could be re-established only when using gas puff levels of a few 1021 es-1. On average, the confinement is lower with the new PFCs, but nevertheless, H factors up to 1 (H-Mode) and 1.3 (at β N ≈ 3, hybrids) have been achieved with W concentrations well below the maximum acceptable level. © 2013 EURATOM
Impact of the ITER-like wall on divertor detachment and on the density limit in the JET tokamak
No full textL-mode and H-mode density limits with the ITER-like wall (ILW) have been investigated in the recent experimental campaign and compared with experiments in the JET carbon material configuration. The density limit is up to 40% higher in the JET-ILW than in the JET-CFC machine. This is linked to the formerly higher radiation fraction and, correspondingly, to earlier divertor detachment in the JET-CFC. In the ILW configuration, the discharge demonstrates a stable operation with a completely detached outer divertor in L- and H-mode. In contrary to the well-known "heating power independent" Greenwald limit, the L-mode densities limit increases moderately with rising heating power (∼ P0.4 heat) independently of the wall material. The H-L transition constitutes an effective undisruptive density limit for an H-mode plasma. Detachment itself does not trigger the H-L back transition and does not present a limit on plasma density. In the range of neutral beam heating 8-10.5 MW, no dependence of the H-mode density limit on the heating power was observed. © 2013 Euratom. Published by Elsevier B.V. All rights reserved
Shape control with the XSC during plasma current ramp-up and ramp-down at the JET tokamak
No full textThe eXtreme Shape Controller (XSC) has been originally designed to control the plasma shape at JET during the flat-top phase, when the plasma current has a constant value. During the JET 2012 experimental campaigns, the XSC has been used to improve the shape control during the transient phases of plasma current ramp-up and ramp-down. In order to avoid the saturation of the actuators with these transient phases, a Current Limit Avoidance system (CLA ) has been designed and implemented. This paper discusses the CLA algorithm and presents the experimental results achieved at JET during the 2012 campaigns using the XSc. © 2013 IEEE
“Messina 1908-2008”: Progetto di ricerca integrato per l’area Calabro - Peloritana. L’esperimento di sismica passiva
No full textIl 28 dicembre 1908 un forte terremoto colpì duramente le città di Messina e di Regg io Calabria e molteplici
centri abitati limitrofi. L’evento sismico di Mw=7.1 generò un maremoto e causò circa 100.000 morti. Durante
il 2008 numerose sono state le iniziative per rievocare tale importante terremoto che è ricordato nella storia
come il più forte avvenuto in Italia. Tra le iniziative promosse dall’Istituto Nazionale di Geofisica e Vulcanologia vi
è il progetto di ricerca “Messina 1908-2008” le cui finalità sono far convergere i dati sismici e geodetici g ià a
disposizione dei singoli gruppi di ricerca in un’unica banca dati e nel contempo promuoverne l’acquisizione di nuovi.
In questo rapporto è descritto l’esperimento di sismica passiva integrato mare-terra iniziato ad ottobre 2007 e
ter minato nel gennaio 2010 avente l’obiettivo di acquisire nuovi dati di alta qualità e dettaglio per ottenere una
migliore definizione della microsismicità locale. Ciò consentirà di raggiungere una migliore comprensione di come
inter ag iscano il processo di subduzione e le dinamiche superficiali nell’area dell’arco Calabro Peloritano ed in
particolare nello stretto di Messina.Istituto Nazionale di Geofisica e VulcanologiaPublished1.1. TTC - Monitoraggio sismico del territorio nazionaleope
Myocardial infarction in a young athlete with non-obstructive hypertrophic cardiomyopathy and normal coronary arteries
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