1,723,365 research outputs found
Ferrari S., Peresani M., Perrone R.
No full textPriva di un contesto stratigrafico e affetta da patine e da varie forme di alterazione, l’industria musteriana descritta in questa nota presenta una facies mista di produzione-utilizzo. Si hanno evidenze per supporre che alcuni manufatti finiti ed elaborati altrove venissero introdotti in questo sito. La variabilità tecnologica e alcune selci di provenienza sicuramente esterna all’area di Terme o alla regione euganea offrono degli elementi di distinzione rispetto ai siti limitrofi, come quello di Monte Versa. Ai vari manufatti Levallois e ai raschiatoi si associa la produzione discoide, attivata su blocchi e noduli irregolari e orientata verso l’ottenimento di supporti apparentemente destinati ad un utilizzo immediato. Si ipotizza che la collocazione dell’abitato, in prossimità di zone umide, fosse legata allo svolgimento di attività di produzione litica profondamente integrate al consumo di risorse e di materiali
Introduzione
No full textL’introduzione spiega il progetto del volume portando alla luce tutta una serie di nodi cruciali sottesi all’ordinamento dei contributi secondo tre assi di ricerca: Tra Italia ed Europa; Misica e Protestantesimo; Tra Europa e Americ
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Sobolev spaces with respect to a weighted Gaussian measure in infinite dimensions
No full textLet X be a separable Banach space endowed with a nondegenerate centered Gaussian measure μ and let w be a positive function on X such that w W1,s(X,μ) and log w ∈W1,t(X,μ) for some s > 1 and t > s′. In this paper, we introduce and study Sobolev spaces with respect to the weighted Gaussian measure ν:= wμ. We obtain results regarding the divergence operator (i.e. the adjoint in L2 of the gradient operator along the Cameron-Martin space) and the trace of Sobolev functions on hypersurfaces x ∈X|G(x) = 0, where G is a suitable version of a Sobolev function
A note on weak-star and norm Borel sets in the dual of the space of continuous functions
No full textLet Bo(T, tau) be the Borel sigma-algebra generated by the topology tau on T. In this paper we show that if K is a Hausdorff compact space, then every subset of K is a Borel set if and only ifBo(C*(K),w*) = Bo(C*(K), parallel to.parallel to),where w* denotes the weak-star topology and parallel to.parallel to is the dual norm with respect to the sup-norm on the space of real-valued continuous functions C(K). Furthermore, we study the topological properties of the Hausdorff compact spaces K such that every subset is a Borel set. In particular, we show that if the axiom of choice holds true, then K is scattered
Lp-Lq estimates for transition semigroups associated to dissipative stochastic systems
No full textIn a separable Hilbert space, we study supercontractivity and ultracontractivity properties for a transition semigroup associated with a stochastic partial differential equation. This is done in terms of exponential integrability of Lipschitz functions and some logarithmic Sobolev-type inequalities with respect to invariant measures. The abstract characterization results concerning the improvement of summability can be applied to transition semigroups associated to stochastic reaction-diffusion equations. (c) 2025 The Author(s). Published by Elsevier Masson SAS. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
Regularizing Properties of (Non-Gaussian) Transition Semigroups in Hilbert Spaces
No full textLet X be a separable Hilbert space with norm ∥ ⋅ ∥ and let T > 0. Let Q be a linear, self-adjoint, positive, trace class operator on X, let F: X→ X be a (smooth enough) function and let W(t) be a X-valued cylindrical Wiener process. For α ∈ [0, 1/2] we consider the operator A: = − (1 / 2) Q2α−1: Q1−2α(X) ⊆ X→ X. We are interested in the mild solution X(t, x) of the semilinear stochastic partial differential equation{dX(t,x)=(AX(t,x)+F(X(t,x)))dt+QαdW(t),t∈(0,T];X(0,x)=x∈X, and in its associated transition semigroupP(t)φ(x):=E[φ(X(t,x))],φ∈Bb(X),t∈[0,T],x∈X; where Bb(X) is the space of the bounded and Borel measurable functions. We will show that under suitable hypotheses on Q and F, P(t) enjoys regularizing properties, along a continuously embedded subspace of X. More precisely there exists K := K(F, T) > 0 such that for every φ∈ Bb(X) , x∈ X, t ∈ (0, T] and h∈ Qα(X) it holds| P(t) φ(x+ h) − P(t) φ(x) | ≤ Kt− 1 / 2∥ Q−αh∥
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