1,720,955 research outputs found
Analisis Pengaruh Penggunaan N-Methyl-2-pyrrolidone sebagai Pelarut Perovskite Thin Film terhadap Performa Glucose Fuel Cell
No full textGlucose fuel cell (GFC) hadir sebagai inovasi teknologi yang mampu menghasilkan listrik dengan mengonversi hidrogen melalui proses oksidasi glukosa menggunakan material semikonduktor yang berperan sebagai katalis. Perovskite thin film CsPbBr3 memiliki karakteristik photoelectrochemical yang unggul sebagai fotoanoda ketika dikombinasikan dengan FTO dan TiO2, tetapi memiliki stabilitas performa dan ketahananan yang rendah dalam sistem GFC. Oleh karena itu, penelitian ini bertujuan untuk menganalisis karakteristik morfologi thin film CsPbBr3 berbasis pelarut N-Methyl-2-pyrrolidone (NMP) dan matriks polycaprolactone (PCL) yang telah melalui heat treatment dengan variasi temperatur dan pengaruhnya terhadap stabilitas performa perovskite thin film CsPbBr3 dalam sistem glucose fuel cell. Pada penelitian ini dilakukan sintesis CsPbBr3 menggunakan metode Ligan-Assisted Reprecipitation Process (LARP) yang selanjutnya diberi perlakuan heat treatment dengan variasi tanpa perlakuan, heat treatment 90℃, dan heat treatment 110℃. Kemudian, dilakukan penambahan larutan NMP/PCL pada CsPbBr3 sebagai matriks dengan variasi rasio NMP:PCL yaitu 1:10, 1:5, dan 3:4. Setelah itu, fabrikasi fotoanoda dilakukan melalui metode dropcasting dengan urutan lapisan dari bawah, yaitu kaca FTO berukuran 2,5 cm x 2,5 cm, TiO2, dan CsPbBr3/NMP+PCL. CsPbBr3/NMP+PCL sesudah proses fabrikasi berupa thin film dilakukan beberapa pengujian, seperti SEM dan XRD untuk mengetahui pengaruh temperatur heat treatment terhadap morfologi serta struktur kristal yang terbentuk. Setelah itu, dalam rangka menganalisis stabilitas termal thin film setelah melalui heat treatment dilakukan pengujian TG/DTA. Pengujian PL dan UV-Vis juga dilakukan untuk mengetahui properti optik dari CsPbBr3/NMP+PCL. Kemudian, performa fotoanoda dalam GFC dianalisis melalui uji CV pada konsentrasi glukosa 0,1 M dan KOH 0,1 M dengan perbandingan volume 1:1 sehingga terjadi reaksi redoks yang efisien. Dengan demikian, penelitian ini akan menganalisis lebih jauh pengaruh penambahan NMP/PCL sebagai matriks fotoanoda dalam memperbaiki morfologi perovskite thin film CsPbBr3 dengan cara mengurangi pembentukan pinhole, memperbesar ukuran butir, dan memperluas film coverage. Selain itu, polaritas dan viskositas NMP yang rendah dapat meningkatkan stabilitas performa thin film CsPbBr3 dalam GFC.
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Glucose fuel cell (GFC) is present as a technological innovation that is able to produce electricity by converting hydrogen through the glucose oxidation process using semiconductor materials that act as catalysts. Perovskite thin film CsPbBr3 has superior photoelectrochemical characteristics as a photoanode when combined with FTO and TiO2, but has low performance stability and durability in GFC systems. Therefore, this study aims to analyze the morphological characteristics of CsPbBr3 thin film based on N-Methyl-2-pyrrolidone (NMP) solvent and Polycaprolactone matrix (PCL) that have undergone heat treatment with temperature variations and their effect on the stability of CsPbBr3 thin film perovskite performance in glucose fuel cell system. In this study, CsPbBr3 synthesis was carried out through Ligan-Assisted Reprecipitation Process (LARP) which was then given heat treatment in conditions without treatment, heat treatment at 90°C, and heat treatment at 110°C. Then, NMP/PCL solution was added to CsPbBr3 as a matrix with variations in the NMP:PCL ratio, namely 1:10, 1:5, and 3:4. After that, photoanode fabrication is carried out through the dropcasting method with a layer sequence from the bottom, namely FTO glass measuring 2.5 cm x 2.5 cm, TiO2, and CsPbBr3/NMP+PCL. CsPbBr3/NMP+PCL after the fabrication process in the form of thin film is carried out several tests, such as SEM and XRD to determine the effect of heat treatment temperature on the morphology and crystal structure formed. After that, in order to analyze the thermal stability of thin film after heat treatment, TG/DTA testing was carried out. PL and UV-Vis tests are also carried out to determine the optical properties of CsPbBr3/NMP+PCL. Then, the performance of photoanodes in GFC was analyzed through CV test at glucose concentrations of 0.1 M and KOH 0.1 M with a volume ratio of 1:1 so that an efficient redox reaction occurred. Thus, this study will further analyze the effect of the addition of NMP/PCL as a photoanode matrix in improving the morphology of CsPbBr3 thin film perovskite by reducing pinhole formation, increasing grain size, and expanding film coverage. In addition, low polarity and viscosity of NMP can improve the performance stability of CsPbBr3 thin film in GFC
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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