1,721,355 research outputs found
Electrophoretic Mobility of a Particle Coated with a Charged Membrane: Effects of Fixed Charge and Dielectric Constant Distributions
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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
Optical and Transport Studies of Acceptor States in Si/SiGe Heterostructure
No full text論文提要
本文探討了Si/SiGe 異質接面及量子井結構的特性，並介紹了一些實驗方法及其結果。在樣品方面，我們使用了Si/SiGe epilayer及Si/SiGe量子井這二個系統。而以主題區分可分為下列三個主題：
1． SiGe在遠紅外光譜的吸收
本實驗室新建立的遠紅外線光譜系統，可以偵測弱束縳系統之束縳能或是躍遷能量。本文介紹了其實驗儀器之操作技巧及工作原理，並引述了他人理論計算之方法與結果，並圖示了此系統的一些特性曲線。最後並量測了一些SixGe1-x 的光譜，其x值在0~0.3之間，量測環境在4k~295k之間。
2． Si/SiGe的霍爾效應
吾人利用了LabVIEW設計了一套自動量測系統，在本文中會對理論解釋、程式設計、儀器配置、以及誤差成因的消去做初步的介紹。量測環境在4k~295k之間，磁場強度變動範圍在0~0.8Tesla之間。
3． 結果與討論
最後提出可能的原因，並討論Si/SiGe異質接面是否真具有產生兆赫波光源的潛力。無目錄
第一章 緒論............................................................1
1.1 研究動機...........................................................1
1.2 研究背景...........................................................2
1.3 研究方向...........................................................2
第二章 理論基礎........................................................5
2.1 晶格不匹配應力造成的Thz radiation..................................5
2.1.1 SiGe與Ge的能帶結構與其淺層能階................................5
2.1.2 p-Ge塊材在壓力下能階的分裂.....................................6
2.1.3 SiGe/Si異質接面所造成的能階變化................................7
2.1.4 量子井中的能階 ................................................8
2.1.5 量子井中的雜質能階.............................................9
2.2 A+在量子井中的生成.................................................10
2.3 遠紅外光光譜量測..................................................10
第三章 實驗裝置與原理.................................................22
3.1 傅利葉轉換光譜儀(Fourier Transform Spectrometer) ...................22
3.1.1 干涉基本原理..................................................22
3.1.2 儀器特性......................................................23
3.1.3 實驗裝置與實驗流程............................................24
3.2 霍爾效應量測系統..................................................26
3.2.1 實驗原理及量測系統............................................26
3.2.2 樣品處理......................................................27
3.2.3 實驗程序......................................................29
第四章 實驗結果與分析.................................................43
4.1 樣品簡介..........................................................43
4.2 遠紅外線穿透光譜分析 .............................................43
4.3 霍爾效應結果分析..................................................47
4.4 結果與討論........................................................47
第五章 結論、未來工作與感言............................................72
第六章 附錄...........................................................74
附錄A 霍爾效應量測系統所用程式(LabVIEW) ...............................74
附錄B FTIR 與cyostat 、Bolometer的架設.................................7
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
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