12,477 research outputs found
Hitchhiker's guide to the fractional Sobolev spaces
No full textThis paper deals with the fractional Sobolev spaces W-s,W-p. We analyze the relations among some of their possible definitions and their role in the trace theory. We prove continuous and compact embeddings, investigating the problem of the extension domains and other regularity results. Most of the results we present here are probably well known to the experts, but we believe that our proofs are original and we do not make use of any interpolation techniques nor pass through the theory of Besov spaces. We also present some counterexamples in non-Lipschitz domains. (c) 2011 Elsevier Masson SAS. All rights reserved
Regularity of Envelopes
No full textLet X be a compact complex manifold of complex dimension n and α be a smooth closed real form on X such that its cohomology class {α}∈H1,1(X,R) is big. In this paper we prove that, given a bounded function f with bounded distributional laplacian in X, the α-psh envelope P(f) is also locally bounded with locally bounded distributional laplacian on the ample locus of {α}
LHCspin: A polarized internal target for the LHC
No full textThe LHCspin project aims to bring both unpolarized and polarized physics at the LHC through the installation of a gaseous fixed target at the upstream end of the LHCb detector. The forward geometry of the LHCb spectrometer (2 < η < 5) is perfectly suited for the reconstruction of particles produced in fixed-target collisions. The fixed-target configuration, with center-of-mass energies ranging from √sNN = 72 GeV in collisions with Pb beams to √s = 115 GeV in pp interactions, allows to cover a wide backward center-of-mass rapidity region, corresponding to the poorly explored high x-Bjorken and high x-Feynman regimes. The use of transversely polarized H and D targets will allow to study the quarks TMDs in p-p collisions at unique kinematic conditions. Furthermore, being LHCb specifically designed for heavy-flavor physics, final states with c- or b-quarks (e.g. inclusive quarkonia production) will be efficiently reconstructed, thus providing, among other fundamental measurememnts, access to the so-far unknown gluons TMDs. The contribution focuses on the design considerations of the polarized internal target and on a discussion of possible critical machine issues
MEASUREMENT OF THE η′ GLUONIUM CONTENT AND OF THE MASS AT KLOE
No full textHere we update the measurement of the η′ gluonium content and present the final result of the η mass measurement. The η′ gluonium content is estimated by fitting the ratio Rφ = BR(φ → η′γ)/BR(φ → ηγ) together with other decay branching ratios. The analyses have been performed on 450 pb−1 of data collected in the years 2001 and 2002
The LHCspin project: A polarized target experiment at LHC
No full textA polarized target, operated in combination with the high-energy, high-intensity LHC beams and a highly performing LHC particle detector, has the potential to open new physics frontiers and to deepen our understanding of the intricacies of the strong interaction in the non-perturbative regime of QCD. Specifically, the LHCspin project aims to perform spin physics studies in high-energy polarized fixed-target collisions using the LHCb detector. Being designed and optimized for the detection of heavy hadrons, the LHCb spectrometer, in combination with the LHCspin setup, will provide a complementary access to the nucleon structure, e.g., by studying inclusive production of c- and b-hadrons, which represent an ideal tool to access the essentially unexplored spin-dependent gluon TMDs. Furthermore, fixedtarget collisions with 7 TeV proton beams, corresponding to center-of-mass energies ranging from 115 GeV in pp interactions to 72 GeV per nucleon in collisions with ion beams, will allow to cover a wide backward rapidity region, corresponding to the poorly explored high x-Bjorken and high x-Feynman regimes. The status of the LHCspin project is presented along with a selection of physics opportunities
Internal gas target experiments at the LHC
No full textThe physics opportunities offered by a fixed-target program using the proton and lead-ion beams of the LHC is wide and exciting. The LHC beams can provide the most energetic fixed-target measurements by pp, pA, and PbA collisions at √sNN = 72–115 GeV probing unexplored regions of the kinematical plane, including the high-x region. In the case of an unpolarized target the physics rich ranges from QCD to astroparticle, while the polarized target option opens the ground to novel measurements of TMDs, thereby contributing with a complementary approach to the understanding of the dynamics of the quark-gluon interplay inside the nucleon up to the 3-dimensional description of the nucleons. Among the main LHC experiments LHCb is the most suitable to host a fixed gas target. A description of the ongoing fixed-target proposals aimed at having the first LHC unpolarized data in Run3 and polarized data in Run4 will be discussed
Cavità di origine antropica e sicurezza degli edifici scolastici nella città di Roma: i casi di studio di via Asmara (Municipio II) e via Diana (Municipio V)
No full textNegli ultimi anni l'incremento di fenomeni di sprofondamento nel territorio di Roma
Capitale e nella sua area metropolitana costituisce un rischio sempre maggiore per la
popolazione e per le infrastrutture. Il verificarsi di questi eventi è in gran parte dei casi
connesso alla presenza di sistemi caveali di origine antropica e diversa età e funzione.
Il presente studio ha permesso di perfezionare un protocollo speditivo di utilizzo integrato di
alcuni metodi geofisici (microgravimetrico, georadar e sismico) funzionale
all’individuazione di cavità nel sottosuolo, che permette di mappare dimensioni,
distribuzione spaziale e profondità. Tale base informativa risulta imprescindibile per una
gestione in sicurezza degli edifici scolastici esistenti e per la progettazione di nuovi
interventi.Published1 dicembre 2017, Sala Convegni del CNR, P. le Aldo Moro, Roma7A. Geofisica per il monitoraggio ambientale7SR AMBIENTE – Servizi e ricerca per la societ
L'interesse linguistico dell'opera di N. Chetta La creazione del mondo sino al diluvio
No full textNel saggio si delineano i più rilevanti caratteri linguistici - incluse le scelte grafiche adottate - dell'opera di Nicolò Chetta, autore siculo-albanese del secondo Settecento, significativo per la scelta di un registro linguistico medio-alto.In the essay will outline the most important language character - including graphic choices adopted - the work of Nicholas Chetta, Sicilian-Albanian author of the late eighteenth century, significant for the choice of a medium-high linguistic register
Copyright, contratto e accesso alla conoscenza: un’analisi comparata = Copyright, contract and access to knowledge: a comparative analysis.
No full textIl processo di digitalizzazione e lo sviluppo dei media, stravolgendo il paradigma tradizionale del copyright/diritto d’autore conducono a reazioni opposte. Da un lato, estendendo in vario modo l’ampiezza dell’esclusiva autorale favoriscono l’adozione di regole restrittive di accesso e uso dei contenuti; dall’altro, alimentano le logiche di condivisione, specie in alcune aree di produzione del sapere.
Il contratto, pur mutata la propria natura nella dimensione digitale, rappresenta la prima leva per l’affermazione di tali divergenti dinamiche, che, in entrambe le direzioni, riguardano anche la circolazione della conoscenza scientifica. Nel senso dell’apertura, lo strumento negoziale consente di perseguire i principi affermati dal movimento dell’Open Access (OA), abbattendo le barriere economiche e giuridiche all’accesso e utilizzo dei contenuti.
Dal deposito e pubblicazione su archivi istituzionali e disciplinari di opere transitate già attraverso i canali editoriali convenzionali, comunemente definita green road, alla pubblicazione su riviste ad accesso aperto, gold road, il fenomeno si sviluppa dal basso verso l’alto grazie alle dichiarazioni di principio e alle norme informali che hanno sin ora guidato le comunità accademiche nell’affermazione dell’OA. Di recente, tuttavia, i principi dell’OA sono oggetto di attenzione da parte del decisore pubblico che, pur timidamente, ne “impone” l’attuazione a tutte le comunità accademiche. Eppure, il diritto formale non sembra da solo sufficiente: è soltanto il primo tassello di una disciplina organica tesa a definire regole e incentivi per la produzione e la disseminazione della conoscenza scientifica, allo scopo di bilanciare la libertà “accademica” con il diritto di accesso alla conoscenza. = ENGLISH VERSION = Along with a comparative perspective that takes account of the U.S. and Italian law, this work aims to explore the interface between copyright and contract lae in publishing process.
In the current publishing environment, contracts and technology play a dominant role in the exploitation of copyrighted works. Publishers are granted by assignment of all copyright rights to reproduce and publish the work, but also to exercise control over its contents through technological protection measures. At the same time, mass digitization allows libraries and other organizations to make contents available online, which it entails a redefinition of the traditional publishing process and introduces new players to the scene (e.g., Google Books).
Hence, technology proves to be a powerful instrument for the spread of knowledge and it is on this pattern that Open Access (OA) is rapidly gaining ground.
Mostly based on a bottom-up approach that is on soft law, institutional policies and contracts, OA designs a new legal environment targeting the objectives of free accessibility, further distribution, and proper archiving of publications. These aims can be achieved through the creation of new open access business models to publish on OA journals (gold road) or to self-archive in institutional or disciplinary repositories works that have been originally published in conventional journals (green road).
However, in order for OA to be fully developed it is necessary to devise a principled and feasible approach to the dissemination of scholarly works against the current social, economic and legal background.
Indeed, the importance of OA is steadily recognized by legislators who integrate OA provisions into their legal system. This is an innovation of great significance, which was first fostered in the USA, and then extended in some European countries such as Italy and Germany in the European framework. Nevertheless, considering the different law systems, the formal law need to be combined with national strategies and institutional policies providing adequate incentives to the authors, while also promoting academic freedom and the right to knowledge access
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