1,720,956 research outputs found
Studi Bandwidth Antena Mikrostrip Struktur Bi-Quad Hingga Bi-Circular
No full textKarakteristik antena ditentukan oleh sifat-sifat fisika bahan antena, struktur antena dan geometri antena. Berbagai metode telah dikembangkan untuk mendapatkan karakteristik antena. Metode-metode tersebut dapat berupa simulasi menggunakan sebuah software desain antena mikrostrip seperti CST atau berupa pengukuran karakteristik sebuah desain antena menggunakan peralatan ukur seperti network analyzer. Kedua jenis metode tersebut pada dasarnya adalah metode uji coba (trial-error). Hal ini disebabkan oleh belum adanya pengetahuan tentang kaitan antara karakteristik antena dengan parameter-parameter antena tersebut. Dalam penelitian disertasi ini dipelajari kaitan bandwidth antena dengan salah satu parameter desain antena yaitu struktur geometrinya.
Tujuan penelitian disertasi adalah untuk mendapatkan sebuah karakteristik bandwidth antena mikrostrip berdasarkan perbedaan struktur geometri. Dua metode pendekatan dilakukan dalam penelitian ini, yaitu metode simulasi dan metode eksperimen. Untuk keperluan ini, diteliti dan dianalisa bandwidth dari dua struktur geometri antena mikrostrip yaitu struktur bi-quad dan struktur bi-circular.
Langkah-langkah dalam penelitian disertasi adalah: (1) membuat simulasi penentuan bandwidth antena bi-quad dan bi-circular, (2) membuat fabrikasi kedua struktur antena dan mengukur bandwidthnya menggunakan network analyzer, (3) mengembangkan model antena bi-poligonal untuk mendapatkan formula kaitan antara struktur geometri antena dan bandwidthnya dan menggunakan data-data hasil simulasi dan pengukuran untuk validasi model tesebut.
Hasil penerapan model antenna bi-poligonal pada desain antenna bi-quad dan bi-circular telah memperlihatkan bahwa penyebab terjadinya perubahan bandwidth dan pergeseran frekuensi kerja adalah perubahan nilai induktasi dan kapasitansi antena karena perubahan geometri desain antena dari bi-quad menjadi bi-circular. Perubahan geometri antena dari bi-quad menjadi bi-circular menyebabkan perubahan bandwidth dari 120 MHz menjadi 100 MHz dan pergeseran frekuensi kerja dari 2,62 GHz menjadi 2,45 GHz. Perubahan ini disebabkan oleh perubahan induktasi antena dari 26,5872 nH menjadi 29,4467 nH dan perubahan kapasitansi antena dari 0,1389 pF menjadi 0,1435 pF. Hasil pemodelan telah memberikan sebuah formula empiris kaitan antara bandwidth dan frekuensi kerja dengan bentuk geometri antena bi-poligonal.
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Antenna characteristics are determined by the physical properties of the
antenna material, the antenna structure and the antenna geometry. Various methods
have been developed to obtain antenna characteristics. These methods can be in the
form of simulation using a microstrip antenna design software such as CST or in
the form of measuring the characteristics of an antenna design using measuring
equipment such as a network analyzer. Both types of methods are basically trial-
error methods. This is due to the lack of knowledge about the relationship between
antenna characteristics and antenna parameters. In this dissertation research, we
studied the relationship between antenna bandwidth and one of the antenna design
parameters, namely its geometric structure. The aim of the dissertation research was to obtain a bandwidth characteristic
of microstrip antennas based on different geometric structures. Two approaches
were used in this research, namely the simulation method and the experimental
method. For this purpose, we researched and analyzed the bandwidth of two
geometric structures of microstrip antennas, namely the bi-quad structure and the
bi-circular structure. The steps in the dissertation research were: (1) made a simulation of
determining the bandwidth of bi-quad and bi-circular antennas, (2) fabricated the
two antenna structures and measured their bandwidth using a network analyzer, (3)
developed a bi-polygonal antenna model to obtain a formula for the relationship
between the antenna geometry structure and its bandwidth and used simulation and
measurement data to validate the model. The results of the application of the bi-polygonal antenna model on the
design of bi-quad and bi-circular antennas have shown that the cause of changes in
bandwidth and shifts in working frequency is a change in the inductance and
capacitance values of the antenna due to changes in the geometry of the antenna
design from bi-quad to bi-circular. The change in antenna geometry from bi-quad
to bi-circular causes a change in bandwidth from 120 MHz to 100 MHz and a shift
in the working frequency from 2.62 GHz to 2.45 GHz. This change is caused by a
change in antenna inductance from 26.5872 nH to 29.4467 nH and a change in
antenna capacitance from 0.1389 pF to 0.1435 pF. The modeling results have
provided an empirical formula for the relationship between bandwidth and
operating frequency with the geometry of a bi-polygonal antenn
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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