1,720,958 research outputs found
Fabrication of micro sensors for simultaneous temperature and humidity measurements via inkjet printing technology
No full text本研究利用噴墨技術製備同時同點量測之溫濕度感測器，並研究其性質與描述方法。為使材料特性能夠獲得充分了解，首先以奈米粒子墨水噴製銀線、氧化鎳、聚苯胺作為本實驗之電極、溫敏電阻、濕敏電容薄膜，並製作單一感測器。藉由對單一感測元件之特性描述、參數控制，在175℃的後處理後及封裝後，可得良好特性之溫度感測器薄膜，其遵守阿瑞尼士方程式，且有高於市售標準之使用靈敏度，且反應時間極短，以手指觸碰僅3秒即可產生電阻變化；濕度感測器因吸附水氣而產生之電容改變，其吸附現象可以Frendlich等溫吸附線描述，且為一有利吸附 本文亦探討單一感測器製程中之影響因素，如感測器厚度如何影響感測器表現：氧化鎳溫度感測器電子傳導機制為表面電流，因此厚度無法增加其導電度，反而與其表面樣態有關；而聚苯胺厚度則是影響電容大小的因素，但過厚的聚苯胺會造成高濕度時數值失準。而不同面積之氧化鎳薄膜並不影響其表現，卻會些許影響其反應時間；不同面積的聚苯胺薄膜，其電容大小與面積成正相關。 為降低初始電阻使其可運用於室溫或是更低之溫度，本文在製備溫溼度感測器前，亦研究如何利用改變立體結構與混摻材料之方法降低溫度感測器之電阻值，我們利用電極-溫度感測器-電極之立體結構，可有效降低其初始電阻，但其為一較不穩定的結構；若使用銀粒子參雜，則可使初始電阻降低1個數量及至約10MΩ，靈敏度仍保持在3000K。接著我們利用不同裝置迴路達到並聯之感測器組的效果，並利用變數分析、數量級分析與逐步探討等技巧，配合材料本身參數對電阻電容變化之的特性，由雙迴路感測器系統逐步探討至同時同點量測之溫濕度感測組。其模式並無太大改變，並皆可以公式描述。由上述可知，本研究可以簡單不需遮罩、低成本之噴墨製程，製備一低溫可利用之同點同時量測溫溼度感測器組，其對於溫濕度同時量測有一定的信賴度。並利用噴墨參數之調整，使感測器之靈敏度與遲滯時間得到較好之改善。In this research, material used in thermistor and capacitive humidity sensor will be investigated. First we choose silver nanoparticle to fabricate the electrode, nickel oxide for thermistor, polyaniline for capacitive humidity sensor. After 175℃ post-treatment and package, we investigate the single sensor and optimize them by adjust the inkjet parameters. The well-adjusting thermistor will obey Arrhenius equation and has a sensitivity higher than commercial uses. The capacitive humidity sensor will obey Frendlich isotherm. For commercialized temperature and humidity control system there two sensors with independent circuit to monitor temperature and humidity respectively, however in some extreme condition such as freezer or reflow oven these two sensors may interrupt to each other that results in decreased sensitivity. Therefore, in order to overcome this challenge, this research is aimed at integrating sensing material into one parallel circuit on flexible substrates via a low cost direct writing technology. A layer-by-layer strategy is used to integrate the temperature-sensitive NiO layer and humidity-sensitive polyaniline (PANI) layer together as a highly responsive device. The sensing elements, which have an adjustable dimension with a submillimeter scale, can operate over a wide range from temperature lower than 20°C to 100 °C and 20% RH to 90% RH with a great sensitivity. After adjust of inkjet parameters and adding silver nanoparticle into nickel oxide ink for the purpose of optimization for this sensor circuit, this circuit will be analyzed carefully to read temperature and humidity measurements at once. From the water adsorption on PANI thin film and temperature variation in NiO layer, the resistance and capacitance readings of the device in AC mode can be directly correlated to the environmental conditions. A correlation formula combining Arrhenius equation and Frendlich isotherm will be developed to accurately describe the sensor responses
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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