Proton Spin in Deep Inelastic Scattering

So far the analyses of the polarized structure functions of the proton and neutron have been limited to the evaluation of their integrals and comparing them to the prediction of the static quark model of the nucleon. We extended our analysis to the x dependence of the polarized structure functions and observe: the measured structure function excellently agrees with the prediction of the static quark model for Bjorken $x>0.2$ and drops rapidly for $x<0.2$. It is suggested that for Bjorken $x>0.2$ electrons get scattered on the undamaged constituent quarks (alias valence quarks) denoted as quasi-elastic scattering on the constituent quarks and for $x<0.2$ the constituent quarks fragment. In the fragmentation strong interaction is involved which does not preserve the polarization.Comment: 6 pages, 4 figures, Presented at the workshop on Diffraction and Low-x, Reggio Calabria, Aug. 26-Sept. 1, 201

Small Gluonic Spots in the Nucleon: Searching for Signatures in Data

Nuclear shadowing and color glass condensate are possible only at sufficiently small x where parton clouds of different nucleons overlap in the longitudinal direction. Another condition vital for these effect, an overlap of partons in impact parameters, is not easy to fulfill for gluons which are located within small spots, as follows from the observed weakness of diffractive gluon radiation (smallness of the triple-Pomeron coupling). The predicted weakness of the leading twist gluon shadowing has been confirmed recently by data for J/Psi production and Cronin effect in d-Au collisions at RHIC. Smallness of gluonic spots also leads to a rather low value of the slope of the Pomeron trajectory, confirmed by ZEUS data on elastic photoproduction of J/Psi. At the same time, saturation of unitarity for central pp collisions leads to a substantial increase of the Pomeron slope in good agreement with elastic pp data.Comment: Talk given by B. Povh at the Quark Matter 200

The world OA iniciative for scientific communication in civil engineering and institutional repository as its answer – the case study of Slovenia. Poster presentation at 79th IFLA Congress.

Scientific communication in technics consists primarily of articles in peer-reviewed scholarly journals. In our research of 2026 articles, published in JCR journals in the field of civil engineering in 2007, we found out that 21% of them are published as open accessed articles, most of them as articles archived in institutional repositories. They reached 29% of all citations in the analysed period. In accordance with these findings, in 2011 the repository at the University of Ljubljana, Faculty of Civil and Geodetic Engineering was built in open source tool ePrints. 1400 theses as well as 200 research articles have been archived in it till January 2013. The library was one of the most important stakeholders in its building as it is still today. Each of the repository unit is linked into Slovenian bibliographical information system COBISS and its cataloguing part COBIB as well as the part of high valuated research works of Slovenian researchers SICRIS. The statistics (150.000 visits from all over the world in one year) is a motivation for us to develop it further. In the near future the connection to the Slovenian Digital Library (dLib.si) shall be established, which will ensure the preservation of metadata

Does the Open Access Business Model Have a Significant Impact on the Citation of Publications? Case Study in the Field of Civil Engineering

One of the possible benefits of open access (OA) might be the better visibility of articles,which is usually measured by the number of citations of the article. In order to\ud realistically estimate the effect of OA on citation, it is not enough to compare OA and non-OA ISI journals. Thus, as Harnad and Brody (2004) suggested, the numbers of citations\ud of OA and non-OA articles from the same journals were compared. Therefore, we have chosen to analyze the publications in three international journals in the field\ud of civil engineering. All of them have an ISI impact factor in the Civil engineering subject category in the ISI/Web of science database (WOS). The articles were classified\ud into two groups − the OA publications and the non-OA publications. We analyzed all the articles published in the same year and the number of their citations until the end of February 2012, seeking to find out if these two groups differ from each other

Modeling long-term electricity forward prices

In contrast to forwards and futures on storable commodities, prices of long-term electricity forwards exhibit a dynamics different to that of short-term and mid-term prices. We model long-term electricity forward prices through demand and supply for electricity, adjusted with a risk premium. Long-term prices of electricity, oil, coal, natural gas, emission allowance, imported electricity and aluminum are modeled with a vector autoregressive model. To estimate the model we use weekly prices of far-maturity forwards relevant for Nordic electricity market. Electricity prices experienced few substantial shocks during the period analyzed, however, we found no evidence of a structural break. Cointegration analysis indicates two stationary cointegrating vectors. Nord Pool price is found significant in the short- and the long-run model, while the gas price is insignificant in both. Other variables are significant only in the long-run model. The model shows some influence of the risk premium, however not on the long-term electricity forwards at Nord Pool.Electricity prices; long-term forward prices; VAR modeling; cointegration