186,223 research outputs found
Response to the further discussion on “The annual rate of independent events for the analysis of extreme wind speed, by N. Cook”
No full textThe annual rate of independent events - A key interpretation for traditional extreme value distributions of wind velocity
No full textThe extreme value theory has been object of engineering studies for more than a century. The analysis of extreme winds plays a key role for complex civil structures and a driving role in different stages of wind turbines lifetime. Most of extremes probability models depend on the annual rate of independent events (ARIE) which has been traditionally considered a constant value. The authors have embraced a recent belief considering the ARIE as a function of the wind velocity. Even though a certain agreement has been achieved across the researches, some issues are still pending. In this regard, the paper shows that the annual, seasonal and daily fluctuations embedded in time series of the mean wind speeds, constrain its probability distribution and time correlation to be physically consistent. Besides, a new physical interpretation of the ARIE is presented, expressing how the independence across wind observations increases with the wind speed, up to the point that all yearly observations are independent if larger than a suitable speed value. Such a tendency is not revealed if the annual, seasonal and daily fluctuations are excluded by the analysis, leading to a deceitful shape of the ARIE. Finally, the paper shows how the velocity-dependent ARIE model is consistent with the conventional asymptotic extreme value theory, if a sufficiently large left-censorship applies to the dataset. The study of the ARIE presented in this paper is based on long-term Monte Carlo simulation of the mean wind speed
Determination of the W-boson mass at hadron colliders
No full textWe introduce an observable relevant for the determination
of the W-boson mass mW at hadron colliders. This
observable is defined as an asymmetry around the jacobian
peak of the charged-lepton transverse-momentum distribution
in the charged-current Drell–Yan process. We discuss
the observable’s theoretical prediction, presenting results at
different orders in QCD, and showing its perturbative stability.
Its definition as a single scalar number and its linear
sensitivity to mW allow a clean extraction of the latter and a
straightforward discussion of the associated theoretical systematics:
a perturbative QCD uncertainty of O(±5) MeV on
mW can be established by means of this observable, relying
solely on charged-current Drell–Yan information. Owing to
its relatively inclusive nature, the observable displays desirable
properties also from the experimental viewpoint, especially
for the unfolding of detector effects. We show that a
measurement of this observable can lead to a competitive
experimental error on mW at the LHC
A new observable for W-mass determination
No full textIn this contribution we discuss the properties of the jacobian asymmetry, the new observable introduced in [1] for a robust determination of the value and uncertainty of the W-boson mass at hadron colliders
Local analytic sector subtraction for initial- and final-state radiation at NLO in massless QCD
No full textWithin the framework of local analytic sector subtraction, we present the
subtraction of next-to-leading-order QCD singularities for processes featuring
massless coloured particles in the initial as well as in the final state. The
features of the method are explained in detail, including the introduction of
an optimisation procedure aiming at improving numerical stability at the cost
of no extra analytic complexity. A numerical validation is provided for a
variety of processes relevant to lepton as well as hadron colliders. This work
constitutes a relevant step in view of the application of our subtraction
method to processes involving initial-state radiation at
next-to-next-to-leading order in QCD.Comment: 27 pages + appendice
Diphoton production in the ADD model to NLO + parton shower accuracy at the LHC
No full textIn this paper, we present the next-to-leading order predictions for diphoton production in the ADD model, matched to the HERWIG parton shower using the MC@NLO formalism. A selection of the results is presented for d = 2-6 extra dimensions, using generic cuts as well as analysis cuts mimicking the search strategies as pursued by the ATLAS and CMS experiments
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Idealità e Materialismo: A first multi-technique characterization of the Monteverde’s plaster sculpture
No full textGiulio Monteverde (1837–1917) was one of the major and most important sculptors of the early 1900s, both in
Italy and at a worldwide level. Monteverde is mainly known for the artworks he realized in stone and metal, but
he still remains almost unacknowledged for his plaster statues. Until today, neither the manufacture, nor the
chemical composition of these sculptures was ever studied. In this paper, we have performed a preliminary
investigation of the morphological and chemical composition of the gypsum plaster that Monteverde used to
create his artwork in stone “Idealità e Materialismo”, today in the National Gallery of Modern Art in Rome. Microsamples of the sculpture were characterized by scanning electron microscopy (SEM), analytical microprobe
(EDX), Fourier transform infrared spectroscopy (FTIR), and X-ray powder diffraction (XRD). This enabled the
identification of both the chemical composition of the material used by the artist and the steps adopted to realize
his sculptures. The analyzed samples have shown the presence of a thin finishing layer, as a “skin”, covering the
whole artwork. This layer consists mainly of Gypsum, Calcite and Anhydrite and has, consequently, a different
chemical composition than the inner bulk, which is made of pure gypsum. Such outer layer results in a marblelike surface of the sculpture with increased hardness and reduced porosity, which results in a higher resistance to
external environmental conditions. This may also explain why Monteverde’s plaster sculptures are so well
preserved over time
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
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