1,720,991 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
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
Determinazione della struttura cristallina del cis-1,4-poli(1,3-esadiene) isotattico mediante diffrazione ai raggi X e meccanica molecolare
No full textThe crystal structure of isotactic cis-1,4-poly(1,3-hexadiene) has been determined by the combined use of moleculr mechanics and X-ray diffraction. Models of crystal structure have been found by molecular mechanics calculations. The simulated fiber and powder diffraction spectra corresponding to these models have been compared with the experimental ones in order to find the best agreement. The proposed crystal structure is characterized by polymer chains having the s(2/1) symmetry packed in an orthorhombic unit cell, in the P212121 space group
Immagini e narrazioni nel gruppo terapeutico: un¿esperienza con pazienti bulimiche
No full textViene presentato un momento specifico e fecondo che ha preso consistenza nel corso di un'esperienza terapeutica di gruppo con pazienti bulimiche seguite presso il centro di salute mentale di Pavia. La situazione in esame riguarda il movimento emotivo originato in una seduta di gruppo a partire dal ricordo di un'immagine. Tale figura si è andata successivamente arricchendo di significati e valenze affettive finendo per condurci ad una specifica comprensione degli aspetti psicologici e culturali del gruppo e della esperienza bulimica
Determination of the Crystal Structure of Syndiotactic 1,2-Poly(E-3-methyl-1,3-pentadiene) by X-ray Diffraction and Molecular Mechanics
No full textThe crystal structure of syndiotactic 1,2-poly(E-3-methyl-1,3-pentadiene) has been determined by the combination of X-ray diffraction and molecular mechanics. Energy minimizations performed by various potential functions yielded models of crystal structure with calculated X-ray powder profiles similar to the experimental profiles. The best model has been refined in order to fit all the experimental data. The space group is Pcam, and the parameters of the unit cell are a = 15.4 Å, b = 7.45 Å, and c = 5.15 Å. Similarities and differences with the crystal structures of syndiotactic 1,2-poly(1,3-butadiene), syndiotactic 3,4-poly(2-ethyl-1,3-butadiene), and syndiotactic 1,2-poly(E-1,3-pentadiene) are discussed
Determination of the Crystal Structure of Isotactic cis-1,4-Poly(1,3-hexadiene) by X-Ray Diffraction and Molecular Mechanics
No full textThe crystal structure of isotactic cis-1,4-poly(1,3-hexadiene) has been determined through a combination of X-ray diffraction analysis and molecular mechanics. Two reasonable values for unit cell parameters were obtained from the fiber diffraction pattern of a well-oriented sample. Energy maps performed on a molecular model of the polymer chain yielded an absolute minimum corresponding to a conformation having the internal parameters similar to those of an s(2/1) helical polymer chain. Packing energy minimizations performed for all the orthorhombic and monoclinic space groups having crystallographic s(2/1) chain symmetry indicate unequivocally that the best mode of packing is obtained for a crystal structure characterized by a unit cell with parameters a = 8.98 Å , b = 7.82 Å , and c = 8.10 Å in the P212121 space group. The calculated powder and fiber diffraction patterns of this structural model are in very good agreement with the experimental diffraction patterns. Similarities and differences with the crystal structures of isotactic cis-1,4-poly(1,3-pentadiene) and isotactic cis-1,4-poly(2-methyl-1,3-pentadiene) are discussed
Continuo e discontinuo: il trauma come frattura verso il futuro e ponte verso il passato
No full textSi discute la correlazione tra insorgenza dei disturbi alimentari e eventi traumatici pregressi attraverso la descrizione di un caso clinico
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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