1,721,016 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
Effect of preheating and light-curing unit on physicochemical properties of a bulk fill composite
Full text linkMade available in DSpace on 2019-09-12T16:57:00Z (GMT). No. of bitstreams: 0
Previous issue date: 2017Objective: The aim of this study is to evaluate the effect of composite preheating and polymerization mode on degree of conversion (DC), microhardness (KHN), plasticization (P), and depth of polymerization (DP) of a bulk fill composite. Methods: Forty disc-shaped samples (n = 5) of a bulk fill composite were prepared (5 x 4 mm thick) and randomly divided into 4 groups according to light-curing unit (quartz-tungstenhalogen [QTH] or light-emitting diode [LED]) and preheating temperature (23 or 54 degrees C). A control group was prepared with a flowable composite at room temperature. DC was determined using a Fourier transform infrared spectrometer, KHN was measured with a Knoop indenter, P was evaluated by percentage reduction of hardness after 24 h of ethanol storage, and DP was obtained by bottom/top ratio. Data were statistically analyzed by analysis of variance and Tukey's test (alpha = 0.05). Results: Regardless of light-curing, the highest preheating temperature increased DC compared to room temperature on bottom surface. LED showed a higher DC compared to QTH. Overall, DC was higher on top surface than bottom. KHN, P, and DP were not affected by curing mode and temperature, and flowable composite showed similar KHN, and lower DC and P, compared to bulk fill. Conclusion: Composite preheating increased the polymerization degree of 4-mm-increment bulk fill, but it led to a higher plasticization compared to the conventional flowable composite evaluated.[Theobaldo, Jessica Dias; Baggio Aguiar, Flavio Henrique; Nunes Leite Lima, Debora Alves] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Restorat Dent, Ave Limeira 901,POB 52, BR-13414903 Piracicaba, SP, Brazil[Pavesi Pini, Nubia Inocencya] Inga Univ Ctr, Maringa, Parana, Brazil[Suzy Liporoni, Priscila Christiane; Catelan, Anderson] Universidade de Taubaté (Unitau), Dept Den
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
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
Effect of selective dentin conditioning on the durability and bond strength of dental restorations using universal adhesives
No full textO objetivo neste estudo foi avaliar o efeito do condicionamento seletivo da dentina (CSD) na durabilidade da resistência de união de restaurações em resina composta usando diferentes sistemas adesivos universais, antes e após a ciclagem térmica. A superfície vestibular de quarenta e oito incisivos bovinos (n = 8) foi desgastada para exposição de dentina média, então os dentes foram divididos de acordo com o protocolo adesivo (CSD e autocondicionante), composição do adesivo (com HEMA: 2-hidroxietil metacrilato e BPA: Bisfenol A; sem BPA; e sem BPA e HEMA) e período de avaliação (24 h de armazenamento em água destilada e após ciclagem térmica). No modo autocondicionante, o adesivo foi aplicado ativamente por 20 s, volatilizado por 5 s e fotoativado por 10 s. O CSD foi realizado com ácido fosfórico 35% por 3 s, seguida pela lavagem, secagem mantendo a umidade dentinária e aplicação do adesivo como previamente descrito. Então um bloco retangular (4 x 5 mm e 3 mm de espessura) de compósito foi confeccionado em incremento único. A fotoativação dos
materiais foi realizada pelo tempo recomendado pelos fabricantes com um LED polywave com irradiância de 1000 mW/cm2. Os espécimes foram cortados em palitos de 1 x 1 mm, sendo que metade dos palitos foram avaliados após 24 h ou 20.000 ciclos térmicos (5 e 55ºC, tempo de permanência de 30 s). A RU pelo teste de microtração foi obtida usando uma máquina semi-universal de ensaios. Os dados foram analisados estatisticamente pela ANOVA três critérios e teste de Tukey (α =0,05). O CSD (18,7 ± 63,62 MPa) apresentou maior RU comparado ao modo autocondicionante (14,76 ± 4,39 MPa) (p < 0,0001) e a ciclagem térmica (14,63 ± 4,73 MPa) reduziu os valores de RU comparado à 24h (18,89 ± 2,99 MPa) (p < 0,0001), sendo que o CSD apresentou maiores valores de RU tanto em 24 h como após a termociclagem (p = 0,0458). A RU não foi afetada pelo tipo de adesivo (p = 0,2956).
Conclui-se que o CSD poderia ser uma alternativa viável para melhorar a interação de
adesivos universais e aumentar a durabilidade da adesão.The aim in this study was to evaluate the effect of selective dentin etching (SDE) on the bond strength (BS) durability of resin composite restorations using different universal adhesive systems, before and after thermal cycling. Labial surface of fortyeight (n = 8) bovine incisors was abraded to expose mid-dentin, then the teeth were divided according to adhesive protocol (SDE and self-etching), adhesive composition
(with HEMA: 2-hydroxyethyl methacrylate and BPA: Bisphenol A (BPA); BPA-free; and BPA-free and HEMA-free) and evaluation period (24h storage in distilled water and after thermal cycling). In self-etching mode, the adhesive was actively applied for 20 s, volatilized for 5 s and light cured for 10 s. SDE was carried out using 35% phosphoric acid for 3 s, followed by washing, drying, maintaining dentin humidity, and adhesive application as previously described. Then a rectangular block (4 x 5 mm and 3 mm thickness) of composite was made in a single increment. Light curing of the materials was carried out for the time recommended by the manufacturers with a polywave LED with an irradiance of 1,000 mW/cm2. Specimens were cut into 1 x 1 mm beams, with half of the sticks were evaluated after 24 h or 20,000 thermal cycles (5 and 55ºC, residence time of 30 s). BS by microtensile test was obtained using a semi-universal testing machine. Data were statistically analyzed using three way ANOVA and Tukey’s test (α=0.05). SDE (18.7 ± 63.62 MPa) showed higher BS compared to the self-etching mode (14.76 ± 4.39 MPa) (p < 0.0001) and thermal cycling (14.63 ± 4.73 MPa) reduced BS values compared to 24 h (18.89 ± 2.99 MPa) (p < 0.0001), with the SDE showing higher BS values both at 24 h and after thermocycling (p = 0.0458). BS was not affected by the type of adhesive (p = 0.2956). It is concluded that SDE could be a viable alternative to improve the interaction of universal adhesive and increase the durability of adhesion.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)FAPESP: 2022/15686-4FAPESP: 2021/08529-
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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