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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
Descrição osteológica e análise filogenética de um novo material de Rauisuchia (Archosauria, Crurotarsi) da formação Santa Maria, triássico médio Sul-Rio-Grandense, Brasil
Get PDFOs rauissúquios constituem um grupo relacionado à linhagem pró-crocodiliana e apresentam um registro amplamente distribuído pelo mundo, com exceção da Austrália e Antártida. No Brasil, ocorrem apenas na Formação Santa Maria, Mesotriássico do Rio Grande do Sul. O material em estudo (UFRGS-PV-0152-T) constitui-se de elementos cranianos e póscranianos que foram coletados no Município de Vale Verde, em níveis bioestratigráficos correspondentes à Z. A. de Dinodontosaurus, embora não existam registros do local exato do afloramento ou os dados de sua coleta. Após a descrição anatômica e um estudo comparativo com os demais rauissúquios, incluímos os dados morfológicos de UFRGS-PV-0152-T na matriz de dados de Butler et al. (2011), para testar suas relações filogenéticas. Um total de 32 táxons tiveram 149 estados de caracteres recodificados e, como resultado, a árvore de consenso estrito mostrou UFRGS-PV-0152-T como um rauissúquio que expressa uma relação de grupo-irmão com o espécime BSPHG AS 1933L (holótipo de Prestosuchus chiniquensis) com base na presença de uma crista supra-acetabular do ílio que é ântero-dorsalmente inclinada. A análise revelou também duas autapomorfias para UFRGS-PV-0152-T: 1) o astrágalo exibe uma lâmina óssea separando a faceta tibial da margem posterior (sendo este caráter, porém, homoplásico com diversos integrantes do clado Pseudosuchia); 2) presença, na porção rostro-lateral do maxilar, de uma superfície tubercular sobresaliente, com aspecto de carretel, que serve para articulação com o processo póstero-dorsal do pré-maxilar. O exemplar diferencia-se de BSPHG AS 1933L por “possuir um o tubérculo calcaneal com um comprimento (ântero-posterior) um pouco maior do que a largura/espessura de sua base”. Difere dos demais espécimes de Prestosuchus chiniquensis (UFRGS-PV-0156-T e UFRGSPV- 0629-T) por 6 características da caixa craniana e 3 maxilares, e de todos os espécimes (publicados) já atribuídos a Prestosuchus chiniquensis por uma característica do ísquio e outra femural. Tais diferenças parecem não ter um significado tafonômico – devido ao excelente estado preservacional - ou ontogenético, pois apesar do menor tamanho, UFRGSPV- 0152-T não exibe suturas soltas em seu esqueleto. Logo, tais diferenças podem ter um significado taxonômico, possibilitando uma denominação taxonômica distinta para UFRGSPV- 0152-T. Além disso, o estudo comparativo do exemplar em questão com demais exemplares atribuídos a Prestosuchus revela uma grande diversidade anatômica nas formas reunidas sob esta denominação.Rauisuchia is a group related to the pro-crocodilian lineage and present a record widely distributed throughout the world except Australia and Antarctica. In Brazil, it only occurs in the Santa Maria Formation, Mesotriassic of Rio Grande do Sul. The material under study (UFRGS-PV-0152-T) consists of cranial and post-cranial elements that were collected in the municipality of Vale Verde, in the corresponding biostratigraphic levels of Dinodontosaurus AZ, although there is no record of the exact location of the outcrop or data about your collection. After the anatomical description and a comparative study with other rauisuchians, we include morphological data of UFRGS-PV-0152-T on the Butler et al. (2011) data matrix, to test its phylogenetic relationships. A total of 32 taxa had 149 states of characters recoded and as a result, the strict consensus tree showed UFRGS-PV-0152-T as a rauisuchian that expresses a sister-group relationship with the specimen BSPHG AS 1933L (holotype of Prestosuchus chiniquensis) based on the presence of a crest dorsal to the supraacetabular crest/rim anterodorsally inclined. The analysis also revealed two autapomorphies for UFRGS-PV-0152-T: 1) astragalus with a thin lamina separating the tibial facet from the posterior edge (being this character, however, homoplasic with several members of the Pseudosuchia clade); 2) rostrolateral surface of maxilla with a salient tubercular surface (spool like surface) for the articulation with the posterodorsal process of the premaxilla. UFRGS-PV-0152-T differs from BSPHG AS 1933L by having "the calcaneal tuber longer (anteroposteriorly) than broad” and differs from other specimens of Prestosuchus chiniquensis (UFRGS-PV-0156-T and UFRGS-PV-0629-T) in 6 features of the skull and 3 of jaws. It also differs from all specimens published as Prestosuchus chiniquensis (UFRGS-PV- 0156-T e UFRGS-PV-0629-T) by a feature of the ischium and other of the femur. Such differences do not seem to have a taphonomic significance - due to the excellent preservacional state - or ontogenetic because despite the smaller size, UFRGS-PV-0152-T does not display loose sutures in its skeleton. Therefore, such differences may have a taxonomic meaning, allowing a distinct taxonomic designation for UFRGS-PV-0152-T. Moreover, the comparative study of the exemplar in question with other specimens assigned to Prestosuchus reveals a great diversity in anatomical forms united under this name
Um Novo registro de Chanaresuchus Bonaparti Romer 1971 (Archosauriforme, Proterochampsidae) para o triássico médio sul-rio-grandense e considerações acerca da sistemática de proterochampsidae
Get PDFO presente trabalho apresenta a descrição do espécime UFRGS PVT-0877-T, constituído por fragmentos de crânio, de mandíbula, os dois fêmures, uma tíbia e um centro vertebral. O espécime em questão foi coletado no afloramento Schoenstadt, em Santa Cruz do Sul, em níveis atribuídos à Biozona de Traversodontídeos (Ladiniano), da Formação Santa Maria, e foi diagnosticado como pertencente à espécie Chanaresuchus bonapartei Romer 1971, constituindo-se no registro mais recente, em temos bioestratigráficos, deste táxon para o triássico sul-brasileiro. O agrupamento constituído por C. bonapartei, Rhadinosuchus gracilis Huene 1938, Cerritosaurus binsfeldi Price 1946, Chanaresuchus sp. Dornelles 1995, Proterochampsa nodosa Barberena 1982, Poterochampsa barrionuevoi Reig 1958, Gualosuchus reigi Romer 1971 e Tropidosuchus romeri Arcucci 1990, foi aqui reunido sob o nome Proterochampsidae, visando manter o princípio da estabilidade, dada a extensiva utilização do termo. Entretanto, constatou-se a necessidade de uma análise filogenética do grupo interno dos proterocampsideos, para avaliar a possibilidade de existência de mais de uma linhagem dentro deste grupo, bem como avaliar o status taxonômico de algumas formas tradicionalmente não proterocampsídeas, mas que possam vir a serem interpretadas como tais (e.g: Acallosuchus rectori Murry & Long, 1989; Elaphrosuchus rubidgei Broom 1946), o que implicaria, também, em uma ampliação da distribuição bioestratigráfica do clado. Finalmente, o estudo comparativo aqui efetuado entre UFRGS PVT-0877-T e os demais proterocampsídeos constatou a necessidade de serem realizados estudos mais detalhados referentes à ontogenia dos componentes do grupo, uma vez que existem várias referências, na literatura, sugerindo que alguns dos táxons atualmente estabelecidos (e.g. Rhadinosuchus) se tratem, em realidade, de formas juvenis. Nesse contexto, foi sugerida, no presente trabalho, a investigação da hipótese de que Cerritosaurus binsfeldi possa constituir-se numa forma juvenil de Chanaresuchus bonapartei.This dissertation presents a description of the specimen UFRGS PVT-0877-T, consisting of fragments of skull, part of the jaw, two femurs, one tibia and a vertebral center. Such specimen was collected at the "Schoenstadt Outcrop", in Santa Cruz do Sul City, in levels assigned to the Biozone of Traversodontidae (Ladinian), Santa Maria Formation, and was identified as Chanaresuchus bonapartei Romer 1971, being the most recent record of this taxon to the South Brazilian Triassic. The group that includes C. bonapartei, Rhadinosuchus gracilis Huene 1938, Cerritosaurus binsfeldi Price 1946, Chanaresuchus sp. Dornelles 1995 Proterochampsa nodosa Barberena 1982 Proterochampsa barrionuevoi Reig 1958, Gualosuchus Reig Romer 1971 and Tropidosuchus romeri Arcucci 1990 was held here under the name Proterochampsidae, to maintain the principle of stability, given the extensive use of that term. However, some additional studies are required, regarding to this group: 1) a phylogenetic analysis of the internal group of proterocampsids, in order to check its monophily; and 2) a re-evaluation of some other forms not commonly attributed to the proterocampsids but that may be interpreted as such (eg: Acallosuchus rector Murry & Long, 1989; Elaphrosuchus rubidgei Broom 1946), which would also change the biostratigraphic range of the group. Finally, the comparative study made here between UFRGS PVT-0877-T and other proterocampsids show that more detailed studies concerning the ontogeny of the components of the group are needed, since there are some references in the literature, suggesting that some of the taxa currently established (e.g. Rhadinosuchus) could be, in fact, juveniles. In this context, it was suggested, in this work, the hypothesis that Cerritosaurus binsfeldi might be a juvenile of Chanaresuchus bonapartei
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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