1,720,958 research outputs found
Development and Characteristic Study of a Linear Magnetorheological Actuator
No full text磁黏滯液體(Magnetorheological Fluid ,MR-fluid)是一種由導磁微粒與載液組成的液體，可以透過磁場來改變其黏滯度，被應用在減振和制動裝置上。本論文利用磁黏滯液體受到磁場變化時所產生的內聚力變化的現象來設計開發主動式線性致動裝置。首先根據磁黏滯致動器功能需求，提出液囊和多樣化磁迴路之設計概念。並透過理論模型以及電腦輔助分析方式，分析探討磁迴路設計和操作參數對通過磁黏滯液體磁場強度之影響。最後以實驗測試對致動器之位移、致動力、及反應速度進行觀察和量測。致動前，致動器驅動電流與磁迴路之工作間隙成正比關係；致動後磁黏滯致動器可產生穩定之致動力。而磁黏滯液體的殘留特黏現象可藉由磁場的消除和壓縮彈簧力予以解除，以提高回復速度。Magnetorheological Fluids, MR-fluids, normally consist of iron powder suspended in some carrier fluids. The viscosity and the yield stress of MR-fluids can be controlled by the applied magnetic filed, thus the main applications of MR-fluids are dampers and breakers. By utilizing the condensation force of the MR-fluids under the influence of the magnetic field, an active linear actuator is designed and developed in this thesis. According to the functional requirement, the design concepts of bladder and diverse magnetic loop are derived. Through the theoretical model and computer assister analysis, the influence of the design and operating parameters on the field strength through the MR-fluids and studied and analyzed. Finally, through the experimental testings, the displacement, the actuation force, and the reaction speed of the MR-actuator are comprehensively inspected and measured. During the pre-actuation phase, the driving current is linearly dependent on the air gap of the magnetic loop. During the actuation phase, MR-actuator can provide a stable push force. The remnant super-strong viscosity situation of the MR-fluids can be relieved by removing the magnetic filed and using compressive spring, which can increase the recovery speed口試委員審定書 I謝 II文摘要 III文摘要 IV目錄 VII目錄 IX號表 X一章 緒論 1.1 研究動機與背景 1.2 文獻回顧 3.3 內容簡介 10二章 磁黏滯液體 11.1 磁黏滯液體之成分與性質 11.2磁黏滯液體的應用與研究 19三章 磁黏滯式線性致動器之設計開發 21.1 工作原理和概念設計 21.2 設計評估與實體設計 28四章 致動器之磁迴路 35.1 磁迴路理論分析模型建構 35.2 磁迴路模擬分析 41五章 磁黏滯式線性致動器之測試與特性分析 45.1 實驗架構 45.2 系統測試 46.2.1 驅動磁場量測實驗 46.2.2 負載能力量測實驗 48.2.3 反應速率量測實驗 52六章 結論與未來展望 57考文獻 59錄A 磁黏滯液體性能表 63錄B 光纖位移計規格與特性 67錄C 訊號擷取卡規格與特性 69錄D 霍爾元件3503型錄 7
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
- …
