1,720,954 research outputs found
Respon Polymeric Foam yang Diperkuat Serat Tandan Kosong Kelapa Sawit (TKKS) Akibat Beban Tekan Statik dan Impak (Simulasi Numerik)
No full textExperimental and numerical work was reported on the problem of the
response of oil palm empty fruit bunch (OPEFB) fiber reinforced polymeric foam
under static and impact loading conditions. In the experimental investigation, the
static axial compressive test was applied on polyurethane, thermosetting resins, and
OPEFB fiber reinforced polymeric foam specimens and these specimens were
conducted on a servohydraulic material testing machine. The averaged stress-strain
response and the fracture modes in each type of materials were derived from static
test. The fracture modes in each type of materials and the collapsed cells of OPEFB
fiber reinforced polymeric foam were observed by a scanning electron microscope. In
the numerical simulation, the variation of the distributions of normal stresses with
normalized time in OPEFB fiber reinforced polymeric foam due to static and impact
wave propagation was analyzed by using a finite element method (FEM). The finite
element code ANSYS and NASTRAN were used for numerical stress analysis. The
obtained summaries were as followed: (1) The yield stress, the maximum stress, and
the strain to failure were influenced by foams, these foams reduced the stress and
decreased the strain to failure. The fracture modes were also found to be
considerably different for each type of materials. Polyurethane exhibited random
macroscopic fracture, thermosetting resins and OPEFB fiber reinforced polymeric
foam exhibited shear dominated failure and the cells suffered progressive crushing.
(2) Based on FEM computation results were found that the fracture mechanism
corresponded to the regions of the static compressive stress concentration. (3) FEM
computation results suggested that the propagation of incident compressive stress
wave related to impact loading. (4) Based on the static axial compressive test results,
the Young’s modulus and the stiffness were determined and it was found that
thermosetting resins may also contributed to increased the stiffness of polyurethane.Penelitian secara eksperimen dan numerik telah dilaporkan untuk menyelidiki
permasalahan respon polymeric foam diperkuat serat tandan kosong kelapa sawit
(TKKS) akibat pembebanan kondisi pembebanan statik dan impak. Di dalam
penyelidikan secara eksperimen, pengujian tekan statik aksial digunakan terhadap
spesimen polyurethane, resin termoset, dan polytmeric foam diperkuat serat TKKS
dan pengujian spesimen tersebut dilakukan pada mesin uji material servohidraulik.
Respon tegangan-regangan rata-rata dan mode kerusakan setiap material diperoleh
dari uji statik. Mode kerusakan setiap material dan kehancuran rongga polymeric
foam diperkuat serat TKKS diamati menggunakan scanning electron microscope. Di
dalam simulasi numerik, variasi distribusi tegangan normal terhadap waktu pada
polymeric foam diperkuat serat TKKS akibat beban statik dan propagasi gelombang
impak akan dianalisa menggunakan metode elemen hingga (MEH). Elemen hingga
dengan kode ANSYS dan NASTRAN digunakan dalam analisa tegangan secara
numerik. Kesimpulan yang diperoleh dari penelitian ini sebagai berikut: (1) Tegangan
yield, tegangan maksimum, dan regangan saat patah dipengaruhi oleh rongga, rongga
tersebut mereduksi tegangan dan menurunkan regangan saat patah. Mode kerusakan
ditemukan sangat berbeda untuk setiap jenis material. Polyurethane menunjukkan
kerusakan yang acak secara makroskopik, resin termoset dan polymeric foam
diperkuat serat TKKS menunjukkan dominasi kegagalan geser dan rongga-rongga
mengalami kerusakan bertahap. (2) Berdasarkan hasil simulasi MEH ditemukan
bahwa mekanisme kerusakan bersesuaian dengan daerah konsentrasi tegangan tekan
statik. (3) Hasil komputasi FEM menyarankan bahwa propagasi gelombang tegangan
insiden tekan berhubungan dengan beban impak. (4) Berdasarkan hasil uji tekan
statik aksial, modulus elastisitas dan kekakuan telah ditetapkan dan ditemukan bahwa
resin termoset berkontribusi meningkatkan kekakuan polyurethane.178 HalamanTesis Magiste
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full text“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
No full textWe 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
No full textWe 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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