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Pengaruh Variasi Arus Listrik terhadap Struktur Kristal dan Sifat Mekanik pada Baja Karbon M400
Get PDFAbstrakPenelitian ini bertujuan untuk mengetahui perngaruh variasi kuat arus pada las laser terhadap ukuran krstalit, kerapatandislokasi, regangan kisi dan sifat mekanis pda baja karbon sedang serta kawat filler SKD 61. Peralatan las laser yangdigunakan adalah mold laser welding machine “JAL” model JAL-UK-MW400. Kondisi proses pengelasan laser frekuensi10 Hz, pulse 5,.5, 6.5, dan 7.5 ms, dan kuat arus pengelasan 60, 70, dan 80 A. Kemudian, dilakukan proses PWHTTempering pada temperatur 700°C selama 2 jam. Hasil uji XRD menunjukkan bahwa ukuran kristal meningkat denganpeningkatan kuat arus dengan ukuran kristal tertinggi terdapat pada spesimen dengan kuat arus pengelasan 80 Asebesar 12.8428 nm dan ukuran kristal terkecil terdapat pada spesimen matriks sebesar 8.7155 nm. Akan tetapi, untuknilai kerapatan dislokasi dan regangan kisi mengalami penurunan seiring dengan peningkatan kuat arus pengelasan.Hasil uji sifat mekanik kekerasan dan kuat tarik menunjukkan bahwa setelah melalui proses PWHT terlihat bahwa nilaikekerasan dan kuat tarik mengalami penurunan, dimana sebelum proses PWHT nilai kekerasan dan kuat tarik tertinggiterdapat pada spesimen dengan kuat arus pengelasan 80 A di daerah pusat las, sebesar 388.46 HB dan 1340.187 MPa.Setelah melalui proses PWHT, nilai kekerasan dan kuat tarik tertinggi terdapat pada spesimen dengan kuat aruspengelasan 80 A di daerah pusat las, sebesar 232.07 HB dan 1011.09 MPa.Kata Kunci: Baja Karbon Sedang M400; Kekerasan, Kuat Tarik, Las laser; Struktur Kristal.AbstractThis study aims to determine the effect of variations in current strength in laser welding on crystallite size, dislocationdensity, lattice strain, and mechanical properties of medium carbon steel and SKD 61 filler wire. The laser weldingequipment used is the "JAL" mold laser welding machine model JAL- UK-MW400. The condition of the laser weldingprocess is 10 Hz, pulse 5,.5, 6.5, and 7.5 ms, and the welding current is 60, 70, and 80 A. Then, the PWHT-Temperingprocess is carried out at a temperature of 700°C for 2 hours. XRD test results showed that the crystal size increased withincreasing current strength, with the highest crystal size found in specimens with a welding current of 80 A of 12.8428nm, and the smallest crystal size was found in matrix specimens of 8.7155 nm. However, the value of dislocation densityand lattice strain decreased along with the increase in the strength of the welding current. The results of the mechanicalstrength and tensile strength test showed that after going through the PWHT process, it was seen that the hardness andtensile strength values decreased, whereas, before the PWHT process, the highest hardness and tensile strength valueswere found in specimens with a welding current of 80 A in the weld center area, amounting to 388.46 HB and 1340.187MPa. After going through the PWHT process, the highest hardness and tensile strength values were found in specimenswith a welding current of 60 A in the metal parent region, amounting to 292.96 HB and 952.028 MPa.Keywords: Crystal Structure; Hardness; Laser Welding; M400 Carbon Steel; Tensile Strength
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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