1,721,027 research outputs found
Etude de la production de photons isolés dans les collisions p-Pb à √ sNN = 5.02 TeV dans l'expérience ALICE au LHC
No full textLa chromodynamique quantique est la théorie associée à l’ interaction forte dans le modèle standard. Elle prédit le confinement des partons (quarks et gluons) à l’ intérieur des hadrons dans des conditions thermodynamiques standards. Lorsque des hautes densités d’énergie sont mises en jeu, un état de déconfinement de la matière hadronique, le plasma de Quarks et Gluons (PQG), est prédit par la théorie. Cet état aurait existé aux premiers instants de l’ Univers. L ’ expérience ALICE (A Large Ion Collider Experiment) au CERN-LHC est dédiée à l’ étude de la matière hadronique dans les collisions pp, p-Pb et dans les collisions Pb-Pb où la formation d’un PQG est attendue. Dans cette thèse, nous présentons l’étude des photons issus des interactions dures entre partons. Leur section efficace de production est calculable dans le cadre de la chromodynamique quantique perturbative. Une telle mesure effectuée dans les collisions p-Pb, permet d’ étudier les effets nucléaires froids. Expérimentalement, les photons prompts sont mesurés en utilisant la méthode de l’isolement. La mesure de la section efficace des photons isolés dans les collisions p-Pb à √ sNN = 5.02 TeV avec le calorimètre EMCal de l’ expérience ALICE est présentée. Les résultats sont consistants avec les calculs théoriques effectués. La comparaison avec la section efficace mesurée dans les collisions pp a été réalisée via la détermination du facteur de modification nucléaire, RpΑ. Ce dernier est compatible avec l’unité et n’indique aucune modification claire, due à des effets nucléaires, de la production de photons prompts dans les collisions p-Pb.Quantum ChromoDynamics is the theory associated to the strong interaction in the standard model. It predicts that partons (quarks and gluons) are confined into hadrons at standard thermodynamic conditions. A state of deconfined hadronic matter, the Quark-Gluon Plasma (QGP), is predicted for a high energy density and would have existed in the early state of the Universe. ALICE (A Large Ion Collider Experiment) at CERN-LHC (Large Hadron Collider) is dedicated to hadronic matter study in p-p, p-Pb (Pb-p) and in Pb-Pb collisions where QGP formation is expected. In this thesis, we will present the study of photons coming directly from parton-parton hard scatterings, the prompt photons. Their production cross-section is calculable in perturbative Quantum ChromoDynamics theory. Such a measurement in p-Pb collisions enables the study of cold nuclear matter effects whose knowledge is crucial to distinguish key signatures of the QGP from nuclear effects in Pb-Pb collisions. Experimentally, the prompt photon can be discriminated using the isolation analysis method. In this thesis, the measurement of the isolated photon cross-section in p- Pb collisions at √ sNN= 5.02 TeV with the EMCal calorimeter of the ALICE experiment, is presented. The results are consistent, within the uncertainties, with theoretical calculations. The comparison with the measured cross-section in p-p analysis is performed via the determination of the nuclear modification factor RpΑ. The last one is compatible with the unity and does not clearly indicate modification of the prompt photon production due to nuclear effects in p-Pb collisions
Etude de la production de photons isolés dans les collisions p-Pb à $ √(s_NN ) = 5.02TeV dans l'expérience ALICE au LHC
No full textQuantum Chromo Dynamics is the theory associated to the strong interaction in the standard model. It predicts that partons (quarks and gluons) are confined into hadrons at standard thermodynamic conditions. A state of deconfined hadronic matter, the Quark-Gluon Plasma (QGP), is predicted for a high energy density and would have existed in the early state of the Universe. ALICE (A Large Ion Collider Experiment) at CERN-LHC (Large Hadron Collider) is dedicated to hadronic matter study in p-p, p-Pb (Pb-p) and in Pb-Pb collisions where QGP formation is expected.In this thesis, we will present the study of photons coming directly from parton-parton hard scatterings, the prompt photons. Their production cross-section is calculable in perturbative Quantum Chromo Dynamics theory. Such a measurement in p-Pb collisions enables the study of cold nuclear matter effects whose knowledge is crucial to distinguish key signatures of the QGP from nuclear effects in Pb-Pb collisions. Experimentally, the prompt photon can be discriminated using the isolation analysis method. In this thesis, the measurement of the isolated photon cross-section in p-Pb collisions at √(s_NN )= 5.02 TeV with the EMCal calorimeter of the ALICE experiment, is presented. The results are consistent, within the uncertainties, with theoretical calculations. The comparison with the measured cross-section in p-p analysis is performed via the determination of the nuclear modification factor.The last one is compatible with the unity and does not clearly indicate modification of the prompt photonproduction due to nuclear effects in p-Pb collisions.La chromodynamique quantique est la théorie associée à l’interaction forte dans le modèle standard. Elle prédit le confinement des partons (quarks et gluons) à l’intérieur des hadrons dans des conditions thermodynamiques standards. Lorsque des hautes densités d’énergie sont mises en jeu, un état de déconfinement de la matière hadronique, le plasma de Quarks et Gluons (PQG), est prédit par la théorie. Cet état aurait existé aux premiers instants de l’Univers. L ’expérience ALICE (A Large Ion Collider Experiment) au CERN-LHC est dédiée à l’étude de la matière hadronique dans les collisions pp, p-Pb et dans les collisions Pb-Pb où la formation d’un PQG est attendue.Dans cette thèse, nous présentons l’étude des photons issus des interactions dures entre partons. Leur section efficace de production est calculable dans le cadre de la chromodynamique quantique perturbative. Une telle mesure effectuée dans les collisions p-Pb, permet d’étudier les effets nucléaires froids. Expérimentalement, les photons prompts sont mesurés en utilisant la méthode de l’isolement. La mesure de la section efficace des photons isolés dans les collisions p-Pb à √(s_NN )= 5.02 TeV avec le calorimètre EMCal de l’expérience ALICE est présentée. Les résultats sont consistants avec les calculs théoriques effectués. La comparaison avec la section efficace mesurée dans les collisions pp a été réalisée via la détermination du facteur de modification nucléaire. Ce dernier est compatible avec l’unité et n’indique aucune modification claire, due à des effets nucléaires, de la production de photons prompts dans les collisions p-Pb
Etude de la production de photons isolés dans les collisions p-Pb à $ √(s_NN ) = 5.02TeV dans l'expérience ALICE au LHC
No full textQuantum Chromo Dynamics is the theory associated to the strong interaction in the standard model. It predicts that partons (quarks and gluons) are confined into hadrons at standard thermodynamic conditions. A state of deconfined hadronic matter, the Quark-Gluon Plasma (QGP), is predicted for a high energy density and would have existed in the early state of the Universe. ALICE (A Large Ion Collider Experiment) at CERN-LHC (Large Hadron Collider) is dedicated to hadronic matter study in p-p, p-Pb (Pb-p) and in Pb-Pb collisions where QGP formation is expected.In this thesis, we will present the study of photons coming directly from parton-parton hard scatterings, the prompt photons. Their production cross-section is calculable in perturbative Quantum Chromo Dynamics theory. Such a measurement in p-Pb collisions enables the study of cold nuclear matter effects whose knowledge is crucial to distinguish key signatures of the QGP from nuclear effects in Pb-Pb collisions. Experimentally, the prompt photon can be discriminated using the isolation analysis method. In this thesis, the measurement of the isolated photon cross-section in p-Pb collisions at √(s_NN )= 5.02 TeV with the EMCal calorimeter of the ALICE experiment, is presented. The results are consistent, within the uncertainties, with theoretical calculations. The comparison with the measured cross-section in p-p analysis is performed via the determination of the nuclear modification factor.The last one is compatible with the unity and does not clearly indicate modification of the prompt photonproduction due to nuclear effects in p-Pb collisions.La chromodynamique quantique est la théorie associée à l’interaction forte dans le modèle standard. Elle prédit le confinement des partons (quarks et gluons) à l’intérieur des hadrons dans des conditions thermodynamiques standards. Lorsque des hautes densités d’énergie sont mises en jeu, un état de déconfinement de la matière hadronique, le plasma de Quarks et Gluons (PQG), est prédit par la théorie. Cet état aurait existé aux premiers instants de l’Univers. L ’expérience ALICE (A Large Ion Collider Experiment) au CERN-LHC est dédiée à l’étude de la matière hadronique dans les collisions pp, p-Pb et dans les collisions Pb-Pb où la formation d’un PQG est attendue.Dans cette thèse, nous présentons l’étude des photons issus des interactions dures entre partons. Leur section efficace de production est calculable dans le cadre de la chromodynamique quantique perturbative. Une telle mesure effectuée dans les collisions p-Pb, permet d’étudier les effets nucléaires froids. Expérimentalement, les photons prompts sont mesurés en utilisant la méthode de l’isolement. La mesure de la section efficace des photons isolés dans les collisions p-Pb à √(s_NN )= 5.02 TeV avec le calorimètre EMCal de l’expérience ALICE est présentée. Les résultats sont consistants avec les calculs théoriques effectués. La comparaison avec la section efficace mesurée dans les collisions pp a été réalisée via la détermination du facteur de modification nucléaire. Ce dernier est compatible avec l’unité et n’indique aucune modification claire, due à des effets nucléaires, de la production de photons prompts dans les collisions p-Pb
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Variations on the Author
Get PDF“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
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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