1,720,969 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
Avaliação antitumoral dos compostos mesoiônicos: uma revisão da literatura
Get PDFMesoionic compounds are synthetic substances, heterocyclic betaines, composed by a heterocyclic ring of five atoms, with flat structures and whose alpha atom is in the same plane of the ring. These characteristics lead to interactions with DNA, proteins and diffusion through biological membranes. In order to perform this work, we searched for articles published in the period between January 1997 and April 2018 in the main databases (Pubmed, NCBI, SciELO, Science Direct, Google Academic and the Periodicals of CAPES), using the descriptors Compound, mesoionic , cancer, antitumor and activity. We found four articles reporting the antitumor activity of mesoionic compounds.The N-(4-chloro-3-nitrophenyl)-synenone (Syd1) compound showed in vitro antineoplastic activity in Walker-256 carcinosarcoma cell line and decreased tumor weight and volume, where the carcinosoma was transplanted. In addition, Syd1 also induced increased expression of pro-apoptotic Bax, p53 and caspase-3 proteins and reduced expression of the anti-apoptotic Bcl-2 protein, without hepatotoxic effect. Mesoionic compounds derived from 4-phenyl-5-(4-x-cinnamoyl)-1,3,4-thiadiazolium-2-phenylamine (MI-D) chloride where the x underwent substitutions with different radicals reduced, in vitro, the viability of human melanoma cells depending on concentration and time, and the cytotoxic activity was related to the inhibition of tumor cell adhesion. In another study using Ehrlich carcinoma and sarcoma 180 (S180), mice where treated and exhibit a significant reduction of tumor and ascitic volume. Therefore, mesoionic compounds are shown to be promising prototypes in the treatment of cancer.Os compostos mesoiônicos são substâncias sintéticas, pertencentes à classe das betaínas heterocíclicas, as quais são constituídas por um anel heterocíclico de cinco átomos, com estruturas planas e cujo átomo alfa está no mesmo plano do anel. Essas características acarretam interações com o DNA, proteínas e passagem através de membranas biológicas. Para a realização desse trabalho buscou-se artigos publicados no período de janeiro de 1997 a abril de 2018 nas principais bases de dados (Pubmed, NCBI, SciELO, Science Direct, Google Acadêmico e o Periódicos da CAPES), usando os descritores Compound, mesoionic, cancer, antitumor e activity. Encontrou-se quatro artigos que relatavam a atividade antitumoral dos compostos mesoiônicos. O composto N-(4-cloro-3-nitrofenil)-sydnone (Syd1) apresentou atividade antineoplásica in vitro em linhagem celular de carcinossarcoma Walker-256 e diminuiu o peso e o volume do tumor, onde o carcinossarcoma foi transplantado. Em adição, o Syd1 também induziu aumento na expressão de proteínas pró-apoptóticas Bax, p53 e caspase-3 e reduziu a expressão da proteína anti-apoptótica Bcl-2, sem efeito hepatotóxico. Compostos mesoiônicos derivados do cloreto de 4-fenil-5-(4-x-cinamoil)-1,3,4-tiadiazolium-2-fenilamina (MI-D) em que o x sofreu substituições com diferentes radicais reduziram, in vitro, a viabilidade das células de melanoma humano dependente de concentração e de tempo e, essa atividade citotóxica relacionou-se com a inibição da adesão das células tumorais. Em outro estudo utilizando camundongos com o carcinoma de Ehrlich e com o sarcoma 180 (S180) observou-se uma redução significante do tumor e do volume ascítico. Desta forma, constata-se que os compostos mesoiônicos apresentam atividade antineoplásica e são protótipos promissores no tratamento do câncer
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
Groups and semigroups
No full textBaseado no conjunto das funções parciais injetoras em um conjunto não vazio e no conjunto das funções booleanas de várias variáveis, a dissertação apresenta os conceitos de grupos e de semigrupos inversos, que são constituídos por elementos inversíveis. No caso de grupos, a definição de elemento inversível é a usual e, no caso de semigrupos inversos, a definição de elemento inversível é uma generalização do conceito usual de elemento inversível.Based on the set of injective partial functions in a non empty set and in the set of booleans functions with many variables, this paper shows the concepts of groups and inverse semigroups, which are both made of inversible elements. In groups, the definition of inversible element is the usual and, in inverse semigroups, the definition of inversible element is a generalization of the usual concept of inversible element
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