1,720,977 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
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
Ultrashort pulse generation in broad spectral ranges by using carbon nanotube-based novel passive devices
No full text학위논문(박사)--아주대학교 대학원 일반대학원 :에너지시스템학부,2010. 2Theoretical background
1 Introduction and theoretical background 1
1.1 Introduction 1
1.2 Ultrashort pulse generation 5
1.2.1 Passive mode-locking 5
1.2.2 Saturable absorber 9
1.2.3 Self phase modulation 16
1.2.4 Dispersion and dispersion compensation 19
1.2.5 Measurement of the pulse temporal profile 28
1.2.6 Q-switching instability 30
1.3 Carbon nanotube (CNT) 32
Experimental Results
2 Fabrication and characterization of CNT-based saturable
absorbers 39
2.1 Linear optical properties of CNT-SAs 40
2.2 Nonlinear optical properties of CNT-SAs 43
3 Passively mode-locked Cr:forsterite laser 54
3.1 Cr:forsterite 54
3.2 Cr:forsterite laser configuration 58
3.3 Passive mode-locking of Cr:forsterite laser using a
SWCNT-SA 60
4 Passively mode-locked Cr:YAG laser 70
4.1 Cr:YAG 70
4.2 Cr:YAG laser configuration 73
4.3 Passive mode-locking of Cr:YAG laser using a SWCNT-SA 75
5 Passively mode-locked Tm:KLuW laser 83
5.1 Tm:KLuW 83
5.2 Tm:KLuW laser configuration 86
5.3 Q-switching and passive mode-locking of Tm:KLuW laser using a SWCNT-SA 87
6 Passively mode-locked Yb:KYW/KYW laser 95
6.1 Yb:KYW 95
6.2 Yb:KYW/KYW laser configuration 98
6.3 Passive mode-locking of Yb:KYW/KYW laser using a SWCNT-SA 101
7 Conclusion 106
Bibliography 109
Publication lists 115MasterUltrashort pulse lasers are widely used in various application areas including NT, BT, and IT, and demand for them is continually increasing. Therefore, the development and application of such lasers are still considered very important. For simple femtosecond laser development, semiconductor saturable absorbers (SESAMs) have been widely used, but their applications are also limited due to their complex manufacturing process and high production costs.
In this thesis, ultrafast single-walled carbon-nanotube-based saturable absorbers (SWCNT-SAs), which can replace the conventional SESAMs, are developed as new ultrafast optical switches and applied to the development of passively-mode-locked solid-state lasers operating between 1.0 and 2.0 ？？m. The linear and nonlinear optical properties of SWCNT-SAs are then characterized using spectrophotometry, pump-probe spectroscopy, and nonlinear transmission/reflection measurement, and their superior optical characteristics are verified as comparable with those of SESAMs.
Various near-IR solid-state lasers, such as Cr:forsterite (1.25 ？gm), Cr:YAG (1.5 ？gm), Tm:KLuW (1.9 ？gm), and Yb:KYW (1.0 ？gm) lasers, are developed in this thesis for application of passive-mode-lockers, SWCNT-SAs. The first experimental results on the passively mode-locked Cr:fosterite laser, which delivered a sub-100 fs near 1.25 ？？m, were achieved using reflective SWCNT-SAs, fabricated from SWCNTs synthesized via the high-pressure CO conversion (HiPCO) technique. In the femtosecond regime, the Cr:forsterite laser delivered an average power of up to 300 mW. These SWCNT-SAs exhibited an ultra-broadband nonlinear absorption properties between ~1.0 and 1.7 ？？m, such that these saturable absorbers were also applied to the Cr:YAG laser that operated near 1.5 ？？m. The passive mode-locking of the Cr:YAG laser using the transmitting SWCNT-SA was also successfully demonstrated for the first time, and stable sub-100 fs pulses with average powers of as high as 110 mW were generated. In the case of the SWCNTs that were synthesized using the Arc-discharge method, they showed nonlinear absorption properties of near 2.0 and 1.0 ？？m, which means that Arc-made SWCNT-based saturable absorbers are applicable for passive mode-locking of other bulk lasers, such as Tm:KLuW and Yb:KYW lasers. Using transmission-type SWCNT-SAs, transform-limited pulses of ~10 ps at 1.94 ？？m were stably generated from the Tm:KLuW laser that delivered a maximum output power of 240 mW, and the passively mode-locked operation of the solid-state Tm laser was the first demonstration, to the best of the authors… knowledge. The Yb:KYW laser was also passively mode-locked via reflective SWCNT-SA and produced transform-limited 83 fs pulses, assuming sech2-shaped pulses, and delivered an average output power of up to 170 mW.
Different solid-state lasers that operated between 1.0 and 2.0 ？？m were successfully mode-locked using novel SWCNT-based passive devices. These SWCNT-SAs, with their various attractive properties, can be considered real alternatives to the currently widely used SESAMs. Simultaneously, this new optical switching device can contribute to the improvement of the technical standards of saturable absorbers
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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