1,720,953 research outputs found
Rancang Bangun Monitoring System Flow Rate, Pressure Drop, Dan Temperature Pada Heat Exchanger Dengan Nanofluida Sebagai Fluida Kerja
No full textPada penelitian ini membahas sistem monitoring real-time untuk mengamati parameter
fluida berupa flow rate, pressure drop, dan temperature pada sistem heat exchanger dengan
menggunakan air, nanofluida ZnO, dan nanofluida ZnO@TiO₂ sebagai fluida kerja. Tujuan dari
sistem ini adalah untuk mengetahui performa perpindahan panas dan karakteristik hidraulik dari
berbagai jenis fluida, serta mengembangkan sistem monitoring berbasis Arduino Mega 2560
dan antarmuka LabVIEW yang mampu menampilkan serta menyimpan data secara langsung.
Pengujian dilakukan dengan memvariasikan temperature fluida 35°C, 45°C, dan 55°C,
kecepatan aliran udara menggunakan kipas 8 m/s, 9 m/s, dan 10.5 m/s, serta bukan valve untuk
memengaruhi laju alir dan tekanan. Validasi sensor dilakukan menggunakan metode
pembanding terhadap alat ukur yang terkalibrasi/validator, dengan hasil error pengukuran
berada dalam rentang yang dapat diterima. Hasil eksperimen menunjukkan bahwa air memiliki
performa perpindahan panas tertinggi pada rentang operasi tersebut yang tidak terlalu jauh,
sehingga dengan tcout mendekati Tin, maka ΔTLMTD mengecil, dan hal ini dapat menurunkan
nilai Q meskipun nanofluida secara data punya U lebih tinggi dari pada air, ditandai dengan
nilai ΔT nanofluida lebih tinggi daripada air. Peningkatan suhu menyebabkan penurunan
viskositas fluida dan tekanan, namun meningkatkan efisiensi perpindahan panas. Sistem
monitoring yang dikembangkan mampu mencatat data secara stabil dan mendukung analisis
performa secara dinamis. Sistem ini diharapkan dapat menjadi acuan dalam pengembangan
sistem kendali dan pemantauan perpindahan panas di laboratorium atau aplikasi skala industri
kecil.
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This study discusses the development of a real-time monitoring system designed to
observe fluid parameters such as flow rate, pressure drop, and temperature within a heat
exchanger system, utilizing water, ZnO nanofluid, and ZnO@TiO₂ hybrid nanofluid as working
fluids. The primary objectives of the system are to evaluate the heat transfer performance and
hydraulic characteristics of various fluids, as well as to develop a monitoring platform based
on Arduino Mega 2560 integrated with a LabVIEW interface capable of displaying and
recording data in real time. Experimental tests were conducted by varying the fluid temperature
at 35°C, 45°C, and 55°C, adjusting air flow velocities using fans at 8 m/s, 9 m/s, and 10.5 m/s,
and modifying valve openings to influence both flow rate and pressure. Sensor validation was
performed by comparing sensor readings with calibrated measurement instruments (validators),
with the resulting measurement errors falling within acceptable limits. The results indicate that,
under the tested conditions, water exhibited the highest heat transfer performance. However,
as the outlet temperature Tout of water approached its inlet temperature Tin, the resulting
logarithmic mean temperature difference ΔTLMTD decreased, which reduced the calculated heat
transfer rate (Q), despite nanofluids demonstrating higher overall heat transfer coefficients (U).
This was evidenced by higher ΔT values for the nanofluids compared to water. Additionally,
increasing fluid temperature was found to reduce viscosity and pressure, while improving heat
transfer efficiency. The developed monitoring system successfully recorded data in a stable
manner and supported dynamic performance analysis. This system is expected to serve as a
reference for future development of heat transfer control and monitoring systems in laboratory
settings or small-scale industrial applications
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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