1,720,953 research outputs found
Análise da correlação entre as propriedades microestruturais e as propriedades mecânicas do aço AHSS DP800 após tratamentos térmicos
Full text linkThis work aims to analyze the correlation between the microstructural properties and
the mechanical properties of AHSS DP800 steel after the application of different
thermomechanical treatments. Initially, test specimens were fabricated by cutting the
material using a mechanical guillotine and a milling machine in the cutting and milling
laboratories of the Mechanical Engineering course at IFPE – Recife Campus. The test
specimens were subjected to specific thermomechanical treatments, where they were
heated to 900°C for 30 minutes, followed by hot rolling and quenching, ending with a
lead bath decomposition and cooling to room temperature.
After the thermomechanical treatments, the mechanical properties of the test
specimens were evaluated through tensile tests. Samples were also prepared for
metallographic analysis using traditional techniques of grinding, polishing, and
chemical etching, for microstructural analysis in a scanning electron microscope
(SEM). The analysis revealed that, in some treatment routes, there was a significant
increase in the mechanical properties of DP800 steel, correlated with the observed
microstructural characteristics. However, other treatment routes resulted in a decrease
in these properties.
The results showed that the presence of ferrite and martensite in the microstructure of
DP800 steel, after the thermomechanical treatments, was fundamental for the increase
in the material's mechanical strength under certain conditions. The combination of
these microstructural phases promoted the improvement of mechanical properties,
demonstrating the effectiveness of the applied treatments. However, certain treatment
conditions did not favor this improvement, leading to a decrease in mechanical
properties.Este trabalho tem como objetivo analisar a correlação entre as propriedades
microestruturais e as propriedades mecânicas do aço AHSS DP800 após a aplicação
de diferentes tratamentos termomecânicos. Inicialmente, foram fabricados corpos de
prova por meio do corte do material utilizando uma guilhotina mecânica e uma
fresadora nos laboratórios de corte e fresagem do curso de Engenharia Mecânica do
IFPE – Campus Recife. Os corpos de prova foram submetidos a tratamentos
termomecânicos específicos, onde foram aquecidos a 900°C durante 30 minutos,
seguidos por laminação a quente e têmpera, finalizando com uma decomposição em
banho de chumbo e resfriados à temperatura ambiente. Após os tratamentos
termomecânicos, as propriedades mecânicas dos corpos de prova foram avaliadas
através de ensaios de tração. Amostras também foram submetidas a preparação
metalográfica, utilizando técnicas tradicionais de lixamento, polimento e ataque
químico, para análise microestrutural em um microscópio eletrônico de varredura
(MEV). A análise revelou que, em algumas rotas de tratamento, houve um aumento
significativo nas propriedades mecânicas do aço DP800, correlacionado com as
características microestruturais observadas. No entanto, outras rotas de tratamento
resultaram em uma diminuição dessas propriedades. Os resultados mostraram que a
presença de ferrita e martensita na microestrutura do aço DP800, após os tratamentos
termomecânicos, foi fundamental para o aumento da resistência mecânica do material
em algumas condições. A combinação dessas fases microestruturais promoveu a
melhoria das propriedades mecânicas, demonstrando a eficácia dos tratamentos
aplicados. Entretanto, certas condições de tratamento não favoreceram essa
melhoria, levando à diminuição das propriedades mecânicas
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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