1,720,953 research outputs found
PERANCANGAN BUCK CONVERTER BERBASIS INTERFACE INTERNET OF THINGS SISTEM PHOTOVOLTAIC
Full text linkA DC–DC converter is an electronic circuit that converts a DC voltage source from one voltage level to another. It consists of a regulator section that functions to step down the voltage according to the load requirements by controlling the duty cycle, namely a buck converter. The primary objective of this study is to design a DC–DC converter system capable of achieving a minimum power conversion efficiency of 85%, maintaining output voltage ripple below 5%, and enabling real-time system monitoring. The research methodology includes the hardware design of a buck converter utilizing a MOSFET IRFP260N and a 60UP30DN diode as the main components, operating at a switching frequency of 10 kHz and controlled by a PWM signal. The system is supported by a CLC filter circuit consisting of a 4.5 mH inductor and capacitors of 1000 μF and 2200 μF. For the monitoring subsystem, an IoT-based system using an ESP32 microcontroller is implemented, integrated with two PZEM017 sensors via RS485 communication, along with the development of a web-based dashboard for data visualization using the WebSocket protocol. Comprehensive testing results indicate that the system successfully achieved a maximum power conversion efficiency of 88.30% under a 30 Ω load condition with a 90% duty cycle, exceeding the predefined target. The output voltage ripple was consistently maintained at 1000 mV peak-to-peak, equivalent to 2.82% of the output voltage, thereby meeting the specified performance criteria. The IoT monitoring system also demonstrated reliable real-time visualization of electrical parameters with excellent voltage measurement accuracy. Based on these results, it can be concluded that the developed IoT-based buck converter interface has proven effective in enhancing photovoltaic system performance through high conversion efficiency, optimal voltage ripple control, and the provision of a reliable real-time monitoring system.DC-DC Converter adalah rangkaian elektronik yang mengubah sumber tegangan DC dari satu level ke level tegangan DC lainya. Terdapat bagian regulator yang berfungsi untuk menurunkan tegangan sesuai dengan kebutuhan beban melalui pengaturan duty cycle yakni buck converter. Tujuan utamanya adalah untuk merancang sistem dc-dc converter yang mampu mencapai target efisiensi konversi daya minimal 85%, mempertahankan riak tegangan output di bawah 5%, serta memungkinkan pemantauan sistem secara real-time. Metode penelitian meliputi perancangan perangkat keras Buck Converter yang menggunakan komponen utama MOSFET IRFP260N dan dioda 60UP30DN dengan frekuensi switching 10 kHz yang dikendalikan sinyal PWM, didukung rangkaian filter CLC yang terdiri dari induktor 4,5 mH dan kapasitor 1000 μF dan 2200μF. Pada sisi pemantauan, diterapkan sistem IoT berbasis mikrokontroler ESP32 yang terintegrasi dengan dua sensor PZEM017 melalui komunikasi RS485, serta pengembangan dashboard web untuk visualisasi data via protokol WebSocket. Hasil pengujian komprehensif menunjukkan bahwa sistem berhasil mencapai efisiensi konversi daya tertinggi sebesar 88,30% pada kondisi beban 30Ω dengan duty cycle 90%, melampaui target yang ditetapkan. Riak tegangan output berhasil dipertahankan secara konsisten pada level 1000mV (peak-to-peak) yang setara dengan 2,82% dari tegangan output, sehingga memenuhi spesifikasi performa yang ditetapkan. Sistem monitoring IoT juga berhasil menampilkan data parameter kelistrikan secara real-time dengan akurasi pengukuran tegangan yang sangat baik. Berdasarkan hasil tersebut, dapat disimpulkan bahwa Buck Converter dengan interface berbasis IoT yang dikembangkan telah terbukti efektif dalam meningkatkan kinerja sistem Photovoltaic melalui pencapaian efisiensi konversi yang tinggi, pengendalian riak tegangan yang optimal, serta penyediaan sistem pemantauan yang handal
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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