1,720,961 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
Analysis of organic residues and lead content in Roman amphorae from Southwest Lusitania
Get PDFThe villa of São Cucufate (Vidigueira, southern Alentejo, Portugal) was an agricultural center with Roman occupation from the 1st century AD. For the analysis of organic residues and lead (Pb) content in amphorae sherd from this archaeological site, Gas chromatography coupled with mass spectrometry (GC–MS) and Laser ablation inductively coupled with plasma mass spectrometry (LA-ICP-MS) were applied. GC-MS enabled to identify long chained alkanes, palmitic, stearic, pimaric, isopimaric and abietic acids. The presence of diterpenoids yielded evidence that the amphorae were waterproofed with resinous substances for carrying liquid or semi liquid products. Unfortunately, the absence of phenolic acids in wine biomarker extraction could not help to correlate between the samples with resinous substances and lead content. Moreover, the presence of a wide range of organic compounds is a clear identification of use and reuses of amphorae possibly for plant products, vegetable oils, and animal products during its lifetime; Resumo:
‘Análise de resíduos orgânicos e teor de chumbo em ânforas romanas do sudoeste da Lusitânia’
A vila de São Cucufate (Vidigueira, Alentejo, Portugal) foi um centro agrícola com ocupação Romana desde o século I. Para a análise de resíduos orgânicos e teor em chumbo (Pb) em fragmentos de cerâmica provenientes deste sítio arqueológico, foram utilizadas as técnicas de cromatografia gasosa acoplada a espectrometria de massa (GC–MS) e espectrometria de massa com fonte indutiva de plasma com amostragem por ablação laser (LA-ICP-MS). A análise por GC-MS permitiu a identificação de alcanos de cadeia longa, ácidos gordos palmítico e esteárico, e ácidos pimárico, isopimárico e abiético. A presença de diterpenóides permite colocar a hipótese de que as ânforas terão sido impermeabilizadas com substâncias resinosas, para permitir o transporte de materiais líquidos ou semi-líquidos. Infelizmente, a ausência de ácidos fenólicos após extracção dos biomarcadores vínicos não permitiu fazer a correlação entre conteúdo resinoso, vinho e presença de chumbo. Adicionalmente, a presença de uma vasta gama de compostos orgânicos é um sinal de reutilização das ânforas possivelmente para produtos derivados de plantas, óleos vegetais, e produtos animais durante o tempo da sua utilização
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
Neuro-Fuzzy Controller-Based Solar Panel Tracking System
No full textThe demand for the use of renewable energy sources has increased considerably, in recent years, due to the fast depletion of fossil fuels and population growth. Among the renewable energy sources, the solar photovoltaic (PV) system is a popular and the most economical renewable energy source. Electric power generation using solar PV system utilizes solar panels exposed to the sun. As the position of the sun changes throughout the day, solar tracking systems play a vital role in the efficient operation of a solar photovoltaic system. Therefore there is a need for an efficient controller for the tracking system to maximize the power output from the solar photovoltaic system. This thesis deals with the design and development of a smart controller based solar panel tracking system. Different types of controllers including P, PI, PID, and fuzzy logic controllers have been applied to the tracking system. However, the improvement is not found to be considerable. They have the disadvantage of being relatively hard to design and they may not work well for non-linear systems. This thesis proposes the design and development of a smart neuro fuzzy controller based solar panel tracking system
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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