1,721,084 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
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
Initial conditions in AA and pA collisions
No full textA full understanding of the spacetime evolution of the QCD matter created
in a heavy ion collision requires understanding the properties of the initial stages. In the
weak coupling picture these are dominated by classical gluon fields, whose properties
can also be studied via the scattering of dilute probes off a high energy hadron or nucleus.
A particular challenge is understanding small systems, where LHC data is also showing
signs of collective behavior. We discuss some recent results of on the initial matter production
and thermalization in heavy ion collisions, in particular in the gluon saturation
framework.peerReviewe
EKTqhat - Effective kinetic theory solver with jet quenching parameter
No full text<h1>EKTqhat - Effective kinetic theory solver with jet quenching parameter</h1>
<p>Leading order QCD effective kinetic theory simulation of a gluonic plasma (i.e., without quarks), including methods to obtain the jet quenching parameter.</p>
<h2>Description</h2>
<p>This code is a numerical implementation of QCD effective kinetic theory [<a href="https://inspirehep.net/literature/598397">JHEP 01 (2003) 030 (Arnold, Moore, Yaffe)</a>] without fermions. The EKT solver is based on the code developed and used in [<a href="https://inspirehep.net/literature/1377392">Phys.Rev.Lett. 115 (2015) 18, 182301 (Kurkela, Zhu)</a>, <a href="https://inspirehep.net/literature/1298043">Phys.Rev.Lett. 113 (2014) 18, 182301 (Kurkela, Lu)</a>, <a href="https://inspirehep.net/literature/1277896">Phys.Rev.D 89 (2014) 7, 074036 (Abraao York, Kurkela, Lu, Moore)</a>], and extended to compute the jet quenching parameter for the following publications: For its values during bottom-up thermalization, see <a href="https://inspirehep.net/literature/2644905">arXiv:2303.12595 (Boguslavski, Kurkela, Lappi, Lindenbauer, Peuron)</a> and <a href="https://inspirehep.net/literature/2729195">arXiv:2312.00447 (Boguslavski, Kurkela, Lappi, Lindenbauer, Peuron)</a>.</p>
<p>If you use this code, please cite these papers for the appropriate parts of the code:</p>
<p>Collision kernels: <a href="https://inspirehep.net/literature/1277896">Phys.Rev.D 89 (2014) 7, 074036 (Abraao York, Kurkela, Lu, Moore)</a>, <a href="https://inspirehep.net/literature/1298043">Phys.Rev.Lett. 113 (2014) 18, 182301 (Kurkela, Lu)</a></p>
<p>Expansion and bottom-up thermalization: <a href="https://inspirehep.net/literature/1377392">Phys.Rev.Lett. 115 (2015) 18, 182301 (Kurkela, Zhu)</a></p>
<p>Jet quenching parameter: <a href="https://inspirehep.net/literature/2644905">arXiv:2303.12595 (Boguslavski, Kurkela, Lappi, Lindenbauer, Peuron)</a>, <a href="https://inspirehep.net/literature/2729195">arXiv:2312.00447 (Boguslavski, Kurkela, Lappi, Lindenbauer, Peuron)</a></p>
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
Ultraperipheral collisions and low-x physics
No full textUltraperipheral collisions at the LHC and RHIC offer the highest currently available energy for photon-nucleon and photon-nucleus collisions. Thus they are a valuable tool for studying the gluonic structure of hadrons and nuclei at small x. We discuss recent theoretical work towards understanding such exclusive processes at NLO accuracy in QCD perturbation theory. These theoretical advances are also immediately relevant for understanding the physics of deep inelastic scattering at small x. We also discuss experimental results in ultraperipheral collisions, most prominently for exclusive vector meson production.peerReviewe
Multi-gluon correlations in the color glass condensate
No full textThe third international workshop on multiple partonic interactions (MPI) took place at DESY in Hamburg from 21 to 25 November 2011. MPI are often crucial for interpreting results obtained at the Large Hadron Collider (LHC). The quest for a sound understanding of the dynamics behind MPI { particularly in the era of the LHC { has thus focused the aim of this workshop. It concentrated on phenomenology at previous hadron colliders and early LHC results, as well as theoretical considerations and the modeling of MPI in Monte Carlo event generators. The workshop forstered close contact between the experimental and theoretical communities. It provided a setting to discuss many of the dierent aspects of MPI, eventually identifying them as a unifying concept between apparently dierent lines of research and evaluating their impact on the LHC physics programme. In a total of 45 plenary talks, two round table discussions and a poster session, the workshop covered experimental results, Monte Carlo development and tuning, phenomenology and dedicated measurements of MPI, progress of theoretical understanding as well as the role of MPI in diraction and small-x physics. Connections to closely related research within the elds of heavy ion physics and cosmic rays have also been covered
Effect of sitting position on muscle activation and force generation in simulated sit ski double poling and on balance perturbation test
No full textTuomas Lappi (2014). Effect of sitting position on muscle activation and force generation in simulated sit-ski double poling and on balance perturbation test. Liikuntabiologian laitos, Jyväskylän yliopisto, Biomekaniikan Pro Gradu tutkielma, 98 s.
Kelkkahiihto kuuluu vammaishiihtolajeihin, joita hallinnoi Kansainvälinen Paralympiakomitea (IPC). IPC ylläpitää kelkkahiihtäjien luokitteluprosessia joka pohjautuu hiihtäjän vammojen ominaisuuksiin ja suorituskykyyn kelkkahiihdossa. Luokittelujärjestelmän parametrit perustuvat lihasten ja nivelten toimintakykyyn, jota arvioidaan voimantuoton, liikkuvuuden sekä lääketieteellisen analyysin kautta. Vammojen yksilöllisen luonteen takia toiminnallisuuteen pohjautuva luokittelujärjestelmä jättää tulkinnanvaraa luokan määrittämisessä.
Tämä tutkimus esittelee kelkkahiihtäjien testijärjestelmän joka analysoi neljää kelkkahiihtäjien käyttämää istuma-asentoa. Järjestelmä todennetaan toimivaksi terveillä testihenkilöillä, ja osoitetaan soveltuvaksi myös vammaisurheilijoille. Testijärjestelmää voidaan käyttää tiedon keräämiseen kelkkahiihtäjien luokittelujärjestelmän kehittämiseksi. Testit keräävät tietoa lihasten aktivaatiotasosta ja voimatuotosta tasatyöntösuorituksessa sekä tasapainon säilyttämistilanteissa. Tilastollisesti maksimaalisessa tasatyöntösuorituksessa P3 (polviasento) on edullisempi kuin asento P2 (polvet sylissä) arvolla p=0.011. Tasapainon säilyttämisen kannalta Rectus Abdominus lihaksen aktivaatiossa on näiden asentojen suhteen eroa (p=0.016) P3:sen hyväksi.
Avainsanat: IPC, kelkkahiihto, lihasaktivaatio, istuma-asennot, luokittelu.Tuomas Lappi (2014). Effect of sitting position on muscle activation and force generation in simulated sit-ski double poling and on balance perturbation test. Department of Biology of Physical Activity, University of Jyväskylä, Master’s thesis in Biomechanics, 98 pp.
Sit-skiing is part of Nordic skiing for disabled athletes. It is governed by International Paralympic Committee (IPC) that provides guidelines for sit skiers’ classification process. Classification process analyses key factors on level of impairment and the impact of the disability to the performance on the sport in question. Classification process parameters are based on functional characteristics such as force generation capabilities, range of movements and medical assessments. Due to individualistic nature of disabilities, the functional classification leaves room for discussion about fairness of class allocation.
This study presents a sit skiers’ test set-up that analyses four different sitting positions the sit-skiers use. The test set-up is verified with able bodied test subjects to be applicable to be extended on disabled athletes. It can be used to obtain scientific information to develop the sit-skiers’ classification process. Tests collects information on muscle electronic activation and force generation capabilities on double poling and balance maintenance activities. On maximal speed double poling P3 (kneeing) was concluded to have significant advantage over P2 (knee high) with p=0.011. In balance maintenance Rectus Abdominus’ EMG indicated significant difference between the same positions with p=0.016, P3 having higher value.
Keywords: IPC, sit-skiing, muscle activation, sitting positions, classification.unknown accessibilityei tietoa saavutettavuudest
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