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Analise da influência dos efeitos de forma, alinhamento, quantidade, area de defeitos e tipo de material nas propriedades mecânicas de materiais polimericos produzidos por manufatura aditiva
Get PDFNa era moderna, os polímeros desempenham um papel crucial no panorama tecnológico e
industrial. A capacidade dos polímeros de serem moldados em diversas formas, combinada
com suas propriedades adaptativas e duráveis, tem permitido avanços significativos em
inovação e sustentabilidade. Ao mesmo tempo, os avanços na pesquisa e desenvolvimento
de polímeros, através do uso de tecnologias com a impressão 3D, tem impulsionado várias
áreas, como a engenharia, com a prototipagem rápida de baixo custo, fabricação de peças
de reposição ou a medicina, com biomateriais poliméricos sendo utilizados em implantes
e dispositivos médicos inovadores. Esses materiais oferecem uma combinação única de
biocompatibilidade, flexibilidade e resistência, abrindo novas fronteiras no campo da
saúde. Porém, apesar de todos os avanços nas tecnologias, a presença de defeitos em
polímeros, como vazios e air gaps (espaços vazios entre as camadas de impressões 3D),
pode comprometer sua integridade estrutural, influenciando diretamente nas propriedades
mecânicas desses materiais. Através da fabricação de Corpos de Prova (CP) por Manufatura
Aditiva (MA) (impressão 3D) utilizando filamentos de Poli acido Lactico ( PolyLactic
Acid (PLA)) e Acrilonitrila Butadieno Estireno (ABS) com o objetivo geral de avaliar o
desempenho desses CP, o estudo emprega um planejamento fatorial completo 2
5
e metodo
Analisys of Variance (ANOVA), fabricando CP com 16 combinações distintas de defeitos,
CP controle e grupos adicionais, com variações nos fatores de entrada. Os testes de
tração, conduzidos até a ruptura, fornecem dados significativos analisados estatisticamente
em termos de rigidez, tensão máxima e deformação máxima. As principais conclusões
destacam que todos os fatores analisados mostraram-se significantes, sendo que a alteração
do material, seguida do aumento do tamanho dos defeitos, emergem como os fatores
mais impactantes na variação da rigidez. Para a Tensão Máxima, o tamanho do defeito se
destaca, seguido pela mudança de material. Na Deformação Máxima, o alinhamento dos
defeitos revela-se como o fator mais influente, seguido pelo tamanho dos defeitos.In the modern era, polymers play a crucial role in the technological and industrial land-
scape. The ability of polymers to be molded into various forms, coupled with their adaptive
and durable properties, has enabled significant advancements in innovation and sustain-
ability. Simultaneously, advancements in polymer research and development, facilitated
by technologies like 3D printing, have propelled various fields such as engineering, of-
fering low-cost rapid prototyping and the production of spare parts, and medicine, where
polymeric biomaterials are utilized in innovative implants and medical devices. These ma-
terials provide a unique combination of biocompatibility, flexibility, and strength, pushing
boundaries in the healthcare sector. However, despite technological progress, the presence
of defects in polymers, such as voids and air gaps (empty spaces between layers in 3D
printing), can compromise their structural integrity, directly influencing the mechanical
properties of these materials. Through the manufacturing of Test Specimens (TS) by Addi-
tive Manufacturing (3D printing) using Polyactic Acid (PLA) and Acrylonitrile Butadiene
Styrene (ABS) filaments, with the overall aim of evaluating the performance of these TS,
the study employs a full factorial design 2
5
and Analysis of Variance (ANOVA) method,
producing TS with 16 distinct defect combinations, control TS, and additional groups
with variations in input factors. Tensile tests, conducted until failure, provide statistically
analyzed data on Young’s Modulus, maximum stress, and maximum strain. The primary
conclusions highlight the significance of all analyzed factors, with material alteration and
defect size increase emerging as the most impactful factors in Young’s Modulus variation.
For Maximum Stress, defect size stands out, followed by material change. In Maximum
Strain, defect alignment proves to be the most influential factor, followed by defect size
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
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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