Metodi di valutazione delle pubblicazioni elettroniche stato dell'arte e prospettive

Online access to scientific literature leads to new ways of evaluation. Next to the evaluated literature, new spaces for grey literature have been opened. The process of peer review can become clear and shared. For journals and articles, a new criterion of evaluation based on the number of “motivated” accesses can be made up. However, the pros and cons of these new methods have to be pointed out. This paper is my word in the debate on the objective value of online scholarly publications analysed from the point of view of the user. It is the product of a fruitful collaboration between two university librarians and a professor who has been working for many years in scientific national and international laboratories. They all manage the Biblioteca Digitale of La Sapienza in Rome. What is important is the need to choose sources addressed to users who learn and produce scientific material in a quantitatively and economically detailed way. The argumentation includes the general, but not all-embracing, field of the experimental sciences. The starting point of this work is the need to verify the influence of the digital library on the IF. Did the digital library support or nullify the value of the IF as the evaluation paradigm in order to do better choices while buying? Considering the data, IF seems not enough to evaluate the value of a journal and it has to be implemented with the statistical analysis of the effective use of the journals. In the end, we present schematically a few points and we give a couple of suggestions to the community of librarians and professors which nowadays is working, theoretically and practically, in the management of the digital libraries in Italian scientific institutions

Metodi di valutazione delle pubblicazioni elettroniche stato dell'arte e prospettive

Online access to scientific literature leads to new ways of evaluation. Next to the evaluated literature, new spaces for grey literature have been opened. The process of peer review can become clear and shared. For journals and articles, a new criterion of evaluation based on the number of “motivated” accesses can be made up. However, the pros and cons of these new methods have to be pointed out. This paper is my word in the debate on the objective value of online scholarly publications analysed from the point of view of the user. It is the product of a fruitful collaboration between two university librarians and a professor who has been working for many years in scientific national and international laboratories. They all manage the Biblioteca Digitale of La Sapienza in Rome. What is important is the need to choose sources addressed to users who learn and produce scientific material in a quantitatively and economically detailed way. The argumentation includes the general, but not all-embracing, field of the experimental sciences. The starting point of this work is the need to verify the influence of the digital library on the IF. Did the digital library support or nullify the value of the IF as the evaluation paradigm in order to do better choices while buying? Considering the data, IF seems not enough to evaluate the value of a journal and it has to be implemented with the statistical analysis of the effective use of the journals. In the end, we present schematically a few points and we give a couple of suggestions to the community of librarians and professors which nowadays is working, theoretically and practically, in the management of the digital libraries in Italian scientific institutions

Azimuthal anisotropy of charged jet production in root s(NN)=2.76 TeV Pb-Pb collisions

We present measurements of the azimuthal dependence of charged jet production in central and semi-central root s(NN) = 2.76 TeV Pb-Pb collisions with respect to the second harmonic event plane, quantified as nu(ch)(2) (jet). Jet finding is performed employing the anti-k(T) algorithm with a resolution parameter R = 0.2 using charged tracks from the ALICE tracking system. The contribution of the azimuthal anisotropy of the underlying event is taken into account event-by-event. The remaining (statistical) region-to-region fluctuations are removed on an ensemble basis by unfolding the jet spectra for different event plane orientations independently. Significant non-zero nu(ch)(2) (jet) is observed in semi-central collisions (30-50% centrality) for 20 <p(T)(ch) (jet) <90 GeV/c. The azimuthal dependence of the charged jet production is similar to the dependence observed for jets comprising both charged and neutral fragments, and compatible with measurements of the nu(2) of single charged particles at high p(T). Good agreement between the data and predictions from JEWEL, an event generator simulating parton shower evolution in the presence of a dense QCD medium, is found in semi-central collisions. (C) 2015 CERN for the benefit of the ALICE Collaboration. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).Peer reviewe

Forward-central two-particle correlations in p-Pb collisions at root s(NN)=5.02 TeV

Two-particle angular correlations between trigger particles in the forward pseudorapidity range (2.5 2GeV/c. (C) 2015 CERN for the benefit of the ALICE Collaboration. Published by Elsevier B. V.Peer reviewe

Event-shape engineering for inclusive spectra and elliptic flow in Pb-Pb collisions at root(NN)-N-S=2.76 TeV

Peer reviewe

Pseudorapidity and transverse-momentum distributions of charged particles in proton-proton collisions at root s=13 TeV

The pseudorapidity (eta) and transverse-momentum (p(T)) distributions of charged particles produced in proton-proton collisions are measured at the centre-of-mass energy root s = 13 TeV. The pseudorapidity distribution in vertical bar eta vertical bar <1.8 is reported for inelastic events and for events with at least one charged particle in vertical bar eta vertical bar <1. The pseudorapidity density of charged particles produced in the pseudorapidity region vertical bar eta vertical bar <0.5 is 5.31 +/- 0.18 and 6.46 +/- 0.19 for the two event classes, respectively. The transverse-momentum distribution of charged particles is measured in the range 0.15 <p(T) <20 GeV/c and vertical bar eta vertical bar <0.8 for events with at least one charged particle in vertical bar eta vertical bar <1. The evolution of the transverse momentum spectra of charged particles is also investigated as a function of event multiplicity. The results are compared with calculations from PYTHIA and EPOS Monte Carlo generators. (C) 2015 CERN for the benefit of the ALICE Collaboration. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).Peer reviewe

Elliptic flow of muons from heavy-flavour hadron decays at forward rapidity in Pb-Pb collisions at root s(NN)=2.76TeV

The elliptic flow, v(2), of muons from heavy-flavour hadron decays at forward rapidity (2.5 <y <4) is measured in Pb-Pb collisions at root s(NN)= 2.76TeVwith the ALICE detector at the LHC. The scalar product, two- and four-particle Q cumulants and Lee-Yang zeros methods are used. The dependence of the v(2) of muons from heavy-flavour hadron decays on the collision centrality, in the range 0-40%, and on transverse momentum, p(T), is studied in the interval 3 <p(T)<10 GeV/c. A positive v(2) is observed with the scalar product and two-particle Q cumulants in semi-central collisions (10-20% and 20-40% centrality classes) for the p(T) interval from 3 to about 5GeV/c with a significance larger than 3 sigma, based on the combination of statistical and systematic uncertainties. The v(2) magnitude tends to decrease towards more central collisions and with increasing pT. It becomes compatible with zero in the interval 6 <p(T)<10 GeV/c. The results are compared to models describing the interaction of heavy quarks and open heavy-flavour hadrons with the high-density medium formed in high-energy heavy-ion collisions. (C) 2015 CERN for the benefit of the ALICE Collaboration. Published by Elsevier B.V.Peer reviewe

Centrality evolution of the charged-particle pseudorapidity density over a broad pseudorapidity range in Pb-Pb collisions at root s(NN)=2.76TeV

Peer reviewe