1,721,043 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Partonic showers and jets
Full text linkTitle: Partonic showers and jets Author: Ondřej Hladík Department: Institute of Theoretical Physics MFF UK Supervisor: Mgr. Alexander Kupčo, Ph.D., Institute of Physics ASCR, v. v. i. Abstract: In the present thesis we compare experimentally measured differential and integrated jets shapes with predictions of quantum chromodynamics (QCD) at the second order (NLO) of perturbative expansion. The measured jet sha- pes were taken from ATLAS experiment at LHC in proton-proton collisions at a center-of-mass energy √ s = 7 TeV and were compared with these predictions. The jets were reconstructed by means of anti-kT jet algorithm with R = 0.6. The predictions at NLO QCD agree with data in wider kinematics region than predictions at leading order (LO). The agreement, however, is still in some kine- matical regions not satisfactory. Keywords: QCD, jets, jet shapes, LH
Zkoumání vlastností kalorimetru pro experiment ATLAS v CERN
Full text linkNazev prace: Zkoumani vlastnosti kaJorimetru pro experiment ATLAS v GERNAutor: Ina Chalnpkova Katedra (ustav); Ustav casticove ajaderne fyziky Vedouci bakalafske prace: RNDr. Tomas Davidek, Ph.D. e-mail vcdoucilio: [email protected] Abstrakt: V praci je strncne popsan detektor ATLAS v CER.Nu a jeden z jehosubdetektoru-kalorimetr TileCal. Po uvedem do problematiky kaJoriinetrie je vysvetlen rozvoj sprsek a problem nokompenzovatelno.sti hadronoveho kalorimetru, ktcry souvi.si s podi'lom eloktro- magneticke a hadronovc komponenty rozvoje. Je definovana linearita a energeticke rozsi'renf jako dva z jeho zakladm'ch paramctru. V poslcdrii caati jsou (yto paramctry pomoci progxamu ROOT vyhodnoccne ze simuJaci ijiterakce nabitych pionu s kalorimentrem a porovnane s dosavadnimiexperimentalm'mi zavery. Klicova slova: ATLAS, kalorimetr, TileCal, energeticke rozlisenf, nekompenzova-telnost Title: Study of the calorimeter for ATLAS experiment at CERN Author: Ina Chalupkova Department: Institute of Particle and Nuclear Physics Supervisor: RNDr. Tomas Davzdek, Ph.D. Supervisor's e-mail addresy; [email protected] Abstract: This thesis in its first part briefly explains the CRR.N ATLAS detector and one of its sub-detectors - calorimeter TileCal. After introducing to the calorimetry problematics, are the...Nazev prace: Zkoumani vlastnosti kaJorimetru pro experiment ATLAS v GERNAutor: Ina Chalnpkova Katedra (ustav); Ustav casticove ajaderne fyziky Vedouci bakalafske prace: RNDr. Tomas Davidek, Ph.D. e-mail vcdoucilio: [email protected] Abstrakt: V praci je strncne popsan detektor ATLAS v CER.Nu a jeden z jehosubdetektoru-kalorimetr TileCal. Po uvedem do problematiky kaJoriinetrie je vysvetlen rozvoj sprsek a problem nokompenzovatelno.sti hadronoveho kalorimetru, ktcry souvi.si s podi'lom eloktro- magneticke a hadronovc komponenty rozvoje. Je definovana linearita a energeticke rozsi'renf jako dva z jeho zakladm'ch paramctru. V poslcdrii caati jsou (yto paramctry pomoci progxamu ROOT vyhodnoccne ze simuJaci ijiterakce nabitych pionu s kalorimentrem a porovnane s dosavadnimiexperimentalm'mi zavery. Klicova slova: ATLAS, kalorimetr, TileCal, energeticke rozlisenf, nekompenzova-telnost Title: Study of the calorimeter for ATLAS experiment at CERN Author: Ina Chalupkova Department: Institute of Particle and Nuclear Physics Supervisor: RNDr. Tomas Davzdek, Ph.D. Supervisor's e-mail addresy; [email protected] Abstract: This thesis in its first part briefly explains the CRR.N ATLAS detector and one of its sub-detectors - calorimeter TileCal. After introducing to the calorimetry problematics, are the...Ústav částicové a jaderné fyzikyInstitute of Particle and Nuclear PhysicsFaculty of Mathematics and PhysicsMatematicko-fyzikální fakult
Study of the calorimeter for ATLAS experiment at CERN
No full textNazev prace: Zkoumani vlastnosti kaJorimetru pro experiment ATLAS v GERNAutor: Ina Chalnpkova Katedra (ustav); Ustav casticove ajaderne fyziky Vedouci bakalafske prace: RNDr. Tomas Davidek, Ph.D. e-mail vcdoucilio: [email protected] Abstrakt: V praci je strncne popsan detektor ATLAS v CER.Nu a jeden z jehosubdetektoru-kalorimetr TileCal. Po uvedem do problematiky kaJoriinetrie je vysvetlen rozvoj sprsek a problem nokompenzovatelno.sti hadronoveho kalorimetru, ktcry souvi.si s podi'lom eloktro- magneticke a hadronovc komponenty rozvoje. Je definovana linearita a energeticke rozsi'renf jako dva z jeho zakladm'ch paramctru. V poslcdrii caati jsou (yto paramctry pomoci progxamu ROOT vyhodnoccne ze simuJaci ijiterakce nabitych pionu s kalorimentrem a porovnane s dosavadnimiexperimentalm'mi zavery. Klicova slova: ATLAS, kalorimetr, TileCal, energeticke rozlisenf, nekompenzova-telnost Title: Study of the calorimeter for ATLAS experiment at CERN Author: Ina Chalupkova Department: Institute of Particle and Nuclear Physics Supervisor: RNDr. Tomas Davzdek, Ph.D. Supervisor's e-mail addresy; [email protected] Abstract: This thesis in its first part briefly explains the CRR.N ATLAS detector and one of its sub-detectors - calorimeter TileCal. After introducing to the calorimetry problematics, are the..
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Study of the calorimeter for ATLAS experiment at CERN
No full textNazev prace: Zkoumani vlastnosti kaJorimetru pro experiment ATLAS v GERNAutor: Ina Chalnpkova Katedra (ustav); Ustav casticove ajaderne fyziky Vedouci bakalafske prace: RNDr. Tomas Davidek, Ph.D. e-mail vcdoucilio: [email protected] Abstrakt: V praci je strncne popsan detektor ATLAS v CER.Nu a jeden z jehosubdetektoru-kalorimetr TileCal. Po uvedem do problematiky kaJoriinetrie je vysvetlen rozvoj sprsek a problem nokompenzovatelno.sti hadronoveho kalorimetru, ktcry souvi.si s podi'lom eloktro- magneticke a hadronovc komponenty rozvoje. Je definovana linearita a energeticke rozsi'renf jako dva z jeho zakladm'ch paramctru. V poslcdrii caati jsou (yto paramctry pomoci progxamu ROOT vyhodnoccne ze simuJaci ijiterakce nabitych pionu s kalorimentrem a porovnane s dosavadnimiexperimentalm'mi zavery. Klicova slova: ATLAS, kalorimetr, TileCal, energeticke rozlisenf, nekompenzova-telnost Title: Study of the calorimeter for ATLAS experiment at CERN Author: Ina Chalupkova Department: Institute of Particle and Nuclear Physics Supervisor: RNDr. Tomas Davzdek, Ph.D. Supervisor's e-mail addresy; [email protected] Abstract: This thesis in its first part briefly explains the CRR.N ATLAS detector and one of its sub-detectors - calorimeter TileCal. After introducing to the calorimetry problematics, are the..
Jety ve srážkách těžkých iontů na detektoru ATLAS
No full textAfter some introduction to the quantum chromodynamics and physics of the heavy ions collisions, and after a brief review of the ATLAS detector, the attention is focused to the main aim of the work. The main aim of the work is to develop and test algorithms suitable for the jet reconstruction in heavy ion collisions at the ATLAS detector. After the detailed description of these algorithms and their implementation to the official software of the ATLAS detector, the author analyzes their performance and provides expectation of accuracy of jet measurements in the heavy ion collisions. The rest of the work focuses on a possibility to study the influence of jets by the medium created in heavy ion collisions.Ústav částicové a jaderné fyzikyInstitute of Particle and Nuclear PhysicsFaculty of Mathematics and PhysicsMatematicko-fyzikální fakult
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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