1,720,964 research outputs found
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
Transport de charge et d'entropie dans les métaux dilués
No full textCette thèse traite la dichotomie entre transport électronique de charge et de chaleur ainsi que les propriétés de transport au-delà de la limite quantique dans les métaux dilués. D’abord, nous étudions deux semi-métaux, WP2 et Sb. La loi de Wiedemann-Franz (WF) y est satisfaite à basse température (T≈2K) mais violée à T≈15K. Cette déviation à température finie à la loi de WF résulte de la différence entre les préfacteurs des T2-résistivités. Dans un cadre boltzmannien, cette différence est associée à une abondance de collisions électroniques à petit angle. Cependant, l’exemple de l’3He liquide montre que des collisions fermioniques qui conservent le moment total conduisent à une T2-résistivité thermique. Une interprétation différente est alors possible dans WP2 et Sb : la possible existence d’un régime hydrodynamique des électrons. Pour Sb, le ratio entre les T2-préfacteurs des résistivités thermique et électrique évolue avec la taille du système. Cette découverte appuie le scénario hydrodynamique. Enfin, nous montrons l’existence de corrections hydrodynamiques dans la conductivité thermique due à un autre type de quasiparticules, les phonons. La seconde partie de cette thèse traite du destin de la mer de Fermi au-delà de la limite quantique (QL). Dans le semi-conducteur dopé InAs, nous rapportons l’existence d’un état isolant induit par le champ magnétique selon toutes les géométries de mesure. La comparaison avec la succession d’états induits par le champ dans graphite jusqu’à B=90T révèle que l’état fondamental d’un gaz d’électrons 3D au-delà de la QL n’est pas universel et dépend du système. Nos résultats suggèrent l’existence d’un état de surface conducteur dans InAs.This manuscript focuses on the electronic heat/charge transport dichotomy and the beyond-quantum-limit transport properties of dilute metals.In the first part, we report on a study of two semi-metals, WP2 and Sb. In both cases, we found that the Wiedemann-Franz (WF) law is recovered at low temperature (T ≈ 2 K), but not at T ≈ 15 K. We show that the finite-temperature deviation from the WF law is due to a mismatch between the prefactors of the T 2-resistivities. In the Boltzmann picture of transport, this difference is associated with abundant small-angle scattering among electrons. However, we argue that momentum-conserving fermionic collisions in normal-state liquid 3He also produce a thermal T2-resistivity. This opens the door for an alternative interpretation : the existence of a hydrodynamic regime of electrons in these semi-metals. In this scenario, the larger T2 thermal resistivity is due to momentum-conserving electronic collisions. In the case of Sb, the ratio of the two T2-prefactors evolves with sample size. This observation supports the hydrodynamic scenario. Finally, we find a large hydrodynamic correction in the phononic thermal conductivity. The second part deals with the fate of the Fermi sea in the quantum limit (QL). In the doped semi-conductor InAs, we observe a field-induced insulating state for all geometries of transport. The comparison with the succession of field-induced states in graphite up to B = 90 T reveals that the ground state of a 3D electron gas beyond the QL is system-dependent. The observation of a saturating resistivity accompanied by vanishing thermoelectric coefficients in InAs points to the existence of a conductive surface state
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
Transport de Charge et d'Entropie dans les Métaux Dilués
No full textThis manuscript focuses on the electronic heat/charge transport dichotomy and the beyond-quantum-limit transport properties of dilute metals.In the first part, we report on a study of two semi-metals, WP2 and Sb. In both cases, we found that the Wiedemann-Franz (WF) law is recovered at low temperature (T ≈ 2 K), but not at T ≈ 15 K. We show that the finite-temperature deviation from the WF law is due to a mismatch between the prefactors of the T 2-resistivities. In the Boltzmann picture of transport, this difference is associated with abundant small-angle scattering among electrons. However, we argue that momentum-conserving fermionic collisions in normal-state liquid 3He also produce a thermal T2-resistivity. This opens the door for an alternative interpretation : the existence of a hydrodynamic regime of electrons in these semi-metals. In this scenario, the larger T2 thermal resistivity is due to momentum-conserving electronic collisions. In the case of Sb, the ratio of the two T2-prefactors evolves with sample size. This observation supports the hydrodynamic scenario. Finally, we find a large hydrodynamic correction in the phononic thermal conductivity. The second part deals with the fate of the Fermi sea in the quantum limit (QL). In the doped semi-conductor InAs, we observe a field-induced insulating state for all geometries of transport. This field-induced state is accompanied by a ‘giant’ Seebeck effect. The comparison with the succession of field-induced states in graphite up to B = 90 T reveals that the ground state of a 3D electron gas beyond the QL is system-dependent. The observation of a saturating resistivity accompanied by vanishing thermoelectric coefficients in InAs points to the existence of a conductive surface state.Cette thèse traite la dichotomie entre transport électronique de charge et de chaleur ainsi que les propriétés de transport au-delà de la limite quantique dans les métaux dilués. D’abord, nous étudions deux semi-métaux, WP2 et Sb. La loi de Wiedemann-Franz (WF) y est satisfaite à basse température (T≈2K) mais violée à T≈15K. Cette déviation à température finie à la loi de WF résulte de la différence entre les préfacteurs des T2-résistivités. Dans un cadre boltzmannien, cette différence est associée à une abondance de collisions électroniques à petit angle. Cependant, l’exemple de l’3He liquide montre que des collisions fermioniques qui conservent le moment total conduisent à une T2-résistivité thermique. Une interprétation différente est alors possible dans WP2 et Sb : la possible existence d’un régime hydrodynamique des électrons. Pour Sb, le ratio entre les T2-préfacteurs des résistivités thermique et électrique évolue avec la taille du système. Cette découverte appuie le scénario hydrodynamique. Enfin, nous montrons l’existence de corrections hydrodynamiques dans la conductivité thermique due à un autre type de quasiparticules, les phonons.La seconde partie de cette thèse traite du destin de la mer de Fermi au-delà de la limite quantique (QL). Dans le semi-conducteur dopé InAs, nous rapportons l’existence d’un état isolant induit par le champ magnétique selon toutes les géométries de mesure qui est accompagné par un effet Seebeck « géant ». La comparaison avec la succession d’états induits par le champ dans graphite jusqu’à B=90T révèle que l’état fondamental d’un gaz d’électrons 3D au-delà de la QL n’est pas universel et dépend du système. Nos résultats suggèrent l’existence d’un état de surface conducteur dans InAs
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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