1,721,749 research outputs found
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
Spin polarization in GaAs and microwave-modulated transport in GaN
No full text本論文研究砷化鎵之自旋極化與氮化鎵之微波調制傳輸。內容包括以下二部分：
1.在外加平行磁場下稀薄的砷化鎵電子系統之遷移率與載子濃度相關性：
第一部分的結果是有關高品質具閘極二維電子氣的低溫磁阻測量。在稀薄電子濃度極限下，我們發現在平行磁場下自旋極化明顯。使用簡單的模型，我們估計此稀薄二維電子氣的藍道g係數大概是3.32。這個藍道g係數比一般砷化鎵二維電子系統(0.44)還大的原因是認為在極低電子濃度之電子與電子的交互作用效應所造成的，而且在整個測量範圍內庫侖位能與動能比值rs並沒有值得注意地變化。此外我們還研究在不同平行磁場下稀薄電子氣的遷移率μ與電子濃度n之相關性。我們發現在 關係下指數項This dissertation describes the measurements on the spin polarization in GaAs and microwave-modulated transport in GaN electron systems. This dissertation consists of the following two parts.
1.Mobility dependence on carrier density in a dilute GaAs electron gas in an in-plane magnetic field
I report low-temperature magnetoresistivity measurements of a high-quality gated two-dimensional electron gas (2DEG). In the dilute electron density limit, we show evidence for spin polarization in an in-plane magnetic field. Using a simple model, we estimate the Landé g-factor in this dilute 2DEG to be about 3.32. This enhanced Landé g-factor compared with that of a bulk GaAs 2D electron system (0.44) is ascribed to electron-electron interaction effects at ultra-low electron densities and the fact that over the whole measurement range rs does not vary significantly. Moreover, we report the mobility μ dependence on electron density n of a dilute electron gas at different in-plane magnetic fields. It is found that exponentChapter 1 Introduction......................................1
1.1 GaAs two-dimensional electron gas ......................1
1.1.1 Properties of GaAs devices ...........................1
1.1.2 The modulation doped GaAs/AlGaAs heterostructure......2
1.2 Density of states.......................................7
1.3 AlGaN/GaN electron system...............................9
Chapter 2 Theoretical background............................12
2.1 Classical Hall effect...................................12
2.2 Hall bar mesa patterned in a heterostructure wafer......14
2.3 Quantum Hall effect.....................................15
2.3.1 Landau levels and Shubnikov-de Haas oscillations......16
2.3.2 Quantum Hall effect...................................20
Chapter 3 Sample fabrication and measurement techniques.....24
3.1 Sample fabrication......................................24
3.1.1 Sample structure......................................24
3.1.2 Optical lithography...................................25
3.2 Cryogenic system: Sorption pumping 3He cryostat.........27
3.2.1 Condensation of He....................................28
3.2.2 Controlling the temperature...........................29
3.3 Measurement set-up and four-terminal resistance.........29
Chapter 4 Mobility dependence on carrier density in a dilute GaAs electron gas in an in-plane magnetic field.............33
4.1 Introduction............................................33
4.2 Spin polarization.......................................34
4.3 Density of state varies by applying an in-plane magnetic field.......................................................38
4.4 Changing the carrier densities..........................40
4.5 The ratio of Coulomb energy to kinetic energy...........42
4.6 Results and discussions.................................43
4.6.1 Measurements of the diagonal resistivity in an in-plane magnetic field..............................................43
4.6.2 Estimating the g-factor in an in-plane magnetic field model.......................................................47
4.6.3 Mobility dependence on electron density of a dilute electron gas at different in-plane magnetic fields..........49
4.7 Summary.................................................50
Chapter 5 Microwave-modulated Shubnikov-de Haas-like oscillations in an Al0.4Ga0.6N/GaN electron system......................................................53
5.1 Introduction............................................53
5.2 Experiment..............................................54
5.3 Results and discussions.................................56
5.3.1 Microwave-modulated SdH oscillations..................56
5.3.2 Microwave-modulated SdH oscillations dependence on microwave power.............................................58
5.4 Summary.................................................61
Chapter 6 Conclusions.......................................6
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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