643 research outputs found

    Simple predictions from ALCOR_c for rehadronisation of charmed quark matter

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    We study the production of charmed hadrons with the help of ALCOR_c, the algebraic coalescence model for rehadronisation of charmed quark matter. Mesonic ratios are introduced as factors connecting various antibaryon to baryon ratios. The resulting simple relations could serve as tests of quark matter formation and coalescence type rehadronization in heavy ion collisions.Comment: 7 pages in Latex, 1 PS figur

    Entropy of expanding QCD matter

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    Using the lattice QCD equation of state for an isentropically expanding fireball we follow the evolution of the effective number of particles in an ideal gas pV/T. This number reduces roughly to its third around the crossover temperature, which helps to circumvent the entropy obstacle inherent in quark coalescence models of the hadronization.Comment: 5 pages 4 eps figures LaTe

    e-Factors in e-Agribusiness

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    The Internet offers new opportunities for small businesses to conquer new markets and to find better and cheaper suppliers. Internet-based commerce is widely perceived as the new business logic that operates in a world without boundaries; a world characterized by speed, change, interactivity and connectivity. In this global commercial environment, e-business models appear to be the central conceptual component. Information and communication technologies (ICT) are changing the way in which companies trade with their suppliers and customers. The growing complexity of the food sector drives companies to adopt more sophisticated and effective e-business solutions. If we intend to adopt an e-business solution we have to consider more “e-factors” such as technological, individual, organizational, industrial and societal aspects

    New form of matter at CERN SPS: Quark Matter but not Quark Gluon Plasma

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    I argue that a new form of matter is indeed seen in Pb+Pb collisions at CERN SPS. However, this Quark Matter (QM) is different from the theoretically predicted Quark Gluon Plasma (QGP) because its effective degrees of freedom seem to be the massive (dressed) constituent quarks instead of almost massless quarks and gluons. The equation of state of QM is hard,the time of its rehadronization is short, while the equation of state of a QGP is soft and the time of its rehadronization is long. Other similarities and differences are also summarized.Comment: Invited review talk at the IX International Workshop on Multiparticle Production Torino 2000, full version, 18 pages, 9 figures, uses espcrc2.st

    Multi-Source Spatial Entity Linkage

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    Besides the traditional cartographic data sources, spatial information can also be derived from location-based sources. However, even though different location-based sources refer to the same physical world, each one has only partial coverage of the spatial entities, describe them with different attributes, and sometimes provide contradicting information. Hence, we introduce the spatial entity linkage problem, which finds which pairs of spatial entities belong to the same physical spatial entity. Our proposed solution (QuadSky) starts with a time-efficient spatial blocking technique (QuadFlex), compares pairwise the spatial entities in the same block, ranks the pairs using Pareto optimality with the SkyRank algorithm, and finally, classifies the pairs with our novel SkyEx-* family of algorithms that yield 0.85 precision and 0.85 recall for a manually labeled dataset of 1,500 pairs and 0.87 precision and 0.6 recall for a semi-manually labeled dataset of 777,452 pairs. Moreover, we provide a theoretical guarantee and formalize the SkyEx-FES algorithm that explores only 27% of the skylines without any loss in F-measure. Furthermore, our fully unsupervised algorithm SkyEx-D approximates the optimal result with an F-measure loss of just 0.01. Finally, QuadSky provides the best trade-off between precision and recall, and the best F-measure compared to the existing baselines and clustering techniques, and approximates the results of supervised learning solutions

    Adamikné Jászó Anna, Klasszikus magyar retorika.

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    Most újabb kézikönyvvel bővül e terület szakirodalma: az ELTE professor emetirusa Klasszikus magyar retorika címmel foglalja össze mindazt, amit az argumentációról és a stílusról tudni kell – pontosabban tudni illenék – a felsőoktatásban részt vevő magyar szakos hallgatóknak

    The dependence of strange hadron multiplicities on the speed of hadronization

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    Hadron multiplicities are calculated in the ALCOR model for the Pb+Pb collisions at CERN SPS energy. Considering the newest experimental results, we display our prediction obtained from the ALCOR model for stable hadrons including strange baryons and anti-baryons.Comment: 8 pages, LaTeX in IOP style, appeared in the Proceedings of Strangeness'97 Conference, Santorini, April 14-18 1997, J. of Physics G23 (1997) 194

    Evolution of the concept of Quark Matter: the Ianus face of the heavy ion collisions

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    Since the beginning of the efforts to produce and understand quark matter large changes developed in the ideas of description of this matter. In the present paper we summarize some aspects of this development.Comment: Talk given at 18th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions: Quark Matter 2005 (QM 2005), Budapest, Hungary, 4-9 Aug 2005. 10 pages, 7 figure
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