178 research outputs found
Esperienze di non monogamia tra vecchi e nuovi significati: uno sguardo alla mascolinità
No full textThe stock exchange of influencers
No full textIn many online social networks (OSNs), a limited portion of profiles emerges and reaches a large base of followers, i.e., the so-called social influencers. One of their main goals is to increase their fanbase to increase their visibility, engaging users through their content. In this work, we propose a novel parallel between the ecosystem of OSNs and the stock exchange market. Followers act as private investors, and they follow influencers, i.e., buy stocks, based on their individual preferences and on the information they gather through external sources. In this preliminary study, we show how the approaches proposed in the context of the stock exchange market can be successfully applied to social networks. Our case study focuses on 60 Italian Instagram influencers and shows how their followers short-term trends obtained through Bollinger bands become close to those found in external sources, Google Trends in our case, similarly to phenomena already observed in the financial market. Besides providing a strong correlation between these different trends, our results pose the basis for studying social networks with a new lens, linking them with a different domain
Luca Trappolin, Paolo Gusmeroli, Raccontare l'omofobia in Italia. Genesi e sviluppi di una parola chiave, Torino, Rosenberg & Sellier, 2019, 215 pp.
No full text
Double-Generic initial ideal and Hilbert scheme
No full textFollowing the approach in the book "Commutative Algebra", by D. Eisenbud, where the author describes the generic initial ideal by means of a suitable total order on the terms of an exterior power, we introduce first the "generic initial extensor" of a subset of a Grassmannian and then the "double-generic initial ideal" of a so-called "GL-stable subset" of a Hilbert scheme. We discuss the features of these new notions and introduce also a partial order which gives another useful description of them.
The double-generic initial ideals turn out to be the appropriate points to understand some geometric pro\-per\-ties of a Hilbert scheme: they provide a necessary condition for a Borel ideal to correspond to a point of a given irreducible component, lower bounds for the number of irreducible components in a Hilbert scheme and the maximal Hilbert function in every irreducible component. Moreover, we prove that every isolated component having a smooth double-generic initial ideal is rational. As a byproduct, we prove that the Cohen-Macaulay locus of the Hilbert scheme parameterizing subschemes of codimension 2 is the union of open subsets isomorphic to affine spaces. This improves results by J. Fogarty (1968) and R. Treger (1989)
Parton distributions with small-x resummation: evidence for BFKL dynamics in HERA data
No full textWe present a determination of the parton distribution functions of the proton in which NLO and NNLO fixed-order calculations are supplemented by NLLx small-x resummation. Deep inelastic structure functions are computed consistently at NLO+NLLx or NNLO+NLLx, while for hadronic processes small-x resummation is included only in the PDF evolution, with kinematic cuts introduced to ensure the fitted data lie in a region where the fixed-order calculation of the hard cross-sections is reliable. In all other respects, the fits use the same methodology and are based on the same global dataset as the recent NNPDF3.1 analysis. We demonstrate that the inclusion of small-x resummation leads to a quantitative improvement in the perturbative description of the HERA inclusive and charm-production reduced cross-sections in the small x region. The impact of the resummation in our fits is greater at NNLO than at NLO, because fixed-order calculations have a perturbative instability at small x due to large logarithms that can be cured by resummation. We explore the phenomenological implications of PDF sets with small-x resummation for the longitudinal structure function at HERA, for parton luminosities and LHC benchmark cross-sections, for ultra-high energy neutrino-nucleus cross-sections, and for future high-energy lepton-proton colliders such as the LHeC
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No full textPT: J; CR: BERTONE AL, 1989, VET CLIN N AM-EQUINE, V5, P377 HARRISON IW, 1988, VET SURG, V17, P77; NR: 2; TC: 0; J9: JAVMA-J AM VET MED ASSOC; PG: 2; GA: 028VSSource type: Electronic(1
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