179,741 research outputs found
Lanino: due volti per San Magno
No full textIl presente contributo esamina due disegni di Bernardino Lanino – una testa maschile e una femminile della Biblioteca Reale di Torino – ponendoli in relazione al ciclo di affreschi nella basilica di San Magno a Legnano. Tale rapporto è discusso sulla base di un’inedita campagna fotografica e nell’ambito degli studi per un volume monografico dedicato alla basilica, a cura di Pietro C. Marani, di prossima pubblicazione
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Singular sets of planar hyperbolic billiards are regular
No full textMany planar hyperbolic billiards are conjectured to be ergodic. This paper represents a first step towards the proof of this conjecture. The Hopf argument is a standard technique for proving the ergodicity of a smooth hyperbolic system. Under additional hypotheses, this technique also applies to certain hyperbolic systems with singularities, including hyperbolic billiards. The supplementary hypotheses concern the subset of the phase space where the system fails to be C^2 differentiable. In this work, we give a detailed proof of one of these hypotheses for a large collection of planar hyperbolic billiards. Namely, we prove that the singular set and each of its iterations consist of a finite number of compact curves of class C^2 with finitely many intersection points
A local ergodic theorem for non-uniformly hyperbolic symplectic maps with singularities
No full textIn this paper, we prove a criterion for the local ergodicity of non-uniformly hyperbolic symplectic maps with singularities. Our result is an extension of a theorem of Liverani and Wojtkowski
On the Bernoulli Property of Planar Hyperbolic Billiards
No full textWe consider billiards in non-polygonal domains of the plane with boundaryconsisting of curves of three different types: straight segments, strictly convex inwardcurves and strictly convex outward curves of a special kind. The billiard map for thesedomains is known to have non-vanishing Lyapunov exponents a.e. provided that thedistance between the curved components of the boundary is sufficiently large, and the setof orbits having collisions only with the flat part of the boundary has zero measure. Undera few additional conditions, we prove that there exists a full measure set of the billiardphase space such that each of its points has a neighborhood contained up to a zero measureset in one Bernoulli component of the billiard map. Using this result, we show that thereexists a large class of planar hyperbolic billiards that have the Bernoulli property. This class includes the billiards in convex domains bounded by straight segments and strictlyconvex inward arcs constructed by Donnay
Die philippinische Linke und die neue internationale Situation
No full textDie tiefgreifenden Veränderungen der internationalen Lage in Asien und hier insbesondere die Reformen und die Auseinandersetzungen um Demokratisierung in der VR China, in der UdSSr und in Vietnam haben auch unmittelbare Auswirkungen auf die revolutionäre Bewegung in den Philippinen. Diesen Prozeß untersucht Alexander R. Magno. Er gilt als einer der prolifiertesten analytischen Linken und ist Politikprofessor an der Universität der Philippinen sowie stellvertretender Direktor des unabhängigen Third World Studies Center in Manila
38. Fantuzzi (M.) et Hunter ( R.), Muse e Modelli. La poesia ellenistica da Alessandro Magno ad Augusto
No full textBillault Alain. 38. Fantuzzi (M.) et Hunter ( R.), Muse e Modelli. La poesia ellenistica da Alessandro Magno ad Augusto. In: Revue des Études Grecques, tome 116, Juillet-décembre 2003. pp. 756-757
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
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