1,720,953 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
Fluorinated organic spacers in the design of new low-dimensional hybrid halide perovskites : synthesis and structural characterization
Get PDFLAUREA MAGISTRALELe perovskiti ibride organico-inorganiche (OIHP) sono i nuovi materiali emergenti degli
ultimi anni e vengono utilizzate per un’ampia gamma di applicazioni, tra cui nei transistor, nei diodi a emissione di luce, nelle celle solari, nei fotorivelatori e nei laser. L’utilizzo
di queste perovskiti ibride combina i vantaggi delle parti organiche altamente processabili
in soluzione e con buone proprietà ottiche, con i vantaggi dei semiconduttori cristallini
inorganici, come l’elevata mobilità delle cariche e gli ampi coefficienti di assorbimento.
Le loro eccezionali proprietà optoelettroniche, il basso costo di fabbricazione e il costo
limitato dell’elettricità sono tuttavia ostacolati dalla loro insufficiente stabilità, che porta
a una breve durata operativa e limita la loro applicazione nei dispositivi optoelettronici,
impedendone la commercializzazione su larga scala. Negli ultimi anni sono stati esplorati
molti approcci per aumentare la stabilità delle perovskiti senza sacrificare le prestazioni
dei dispositivi. Un concetto emergente consiste nell’ingegneria a bassa dimensione, ottenuta attraverso l’incorporazione di grandi cationi organici tra le lastre di perovskite ibrida. Queste parti organiche possono essere alogenate e quindi interagire con gli alogeni,
tipicamente presenti nelle perovskiti alogenate, dando origine a un tipo di interazione
non covalente alternativa, denominata legame ad alogeno (XB). In questo lavoro sono
stati selezionati diversi cationi donatori di XB per la sintesi di diverse strutture di perovskite, la cui capacità di formare legami ad alogeno è stata successivamente analizzata.
In particolare, il catione 4-iodoanilinio (IA+) è stato utilizzato per formare la perovskite
tetraiodopiombata , nella cui struttura è stata dimostrata la presenza di XB tra i domini
organici e inorganici e ne è stata studiata la forza, rivelando un’interazione relativamente
debole. Per studiare un legame ad alogeno molto più intenso, è stata applicata la strategia della sostituzione dell’idrogeno con atomi di fluoro. I cationi (4-X-2,3,5,6-tetrafluoro
anilina)-etan-1-ammonio (X-FEA+) (X=I, Br, Cl) sono stati quindi utilizzati per sintetizzare perovskiti a bassa dimensione, seguendo diverse procedure. Le perovskiti fluorurate
ottenute sono state sintetizzate, purificate e caratterizzate mediante 1H NMR, 19F NMR,
MS, XRPD e SCXRD per comprenderne le strutture cristalline finali e per indagare la
forza dei legami ad alogeno, qualora fossero presenti. Questo studio suggerisce che il
legame ad alogeno può verificarsi in condizioni di sintesi specifiche, che consentono di
accorciare la distanza alogeno-alogeno e di aumentare la linearità del legame, con il risultato di un’interazione molto più forte. La variabilità del legame alogeno-alogeno può
essere sfruttata come un potente strumento per controllare la struttura e le proprietà foto
fisiche nelle perovskiti a bassa dimensionalità, migliorando ulteriormente il potenziale di
commercializzazione dei dispositivi optoelettronici basati sulle perovskiti.Organic–inorganic hybrid perovskites (OIHPs) are the new emerging materials for the last
few years, they are used for a wide array of applications, including those in field-effect
transistors, light-emitting diodes, solar cells, photodetectors, and lasers. The utilization
of these hybrid perovskites combines the advantages of the highly solution processable and
optically tunable organic parts, together with the advantages of the inorganic crystalline
semiconductors, like high charge mobilities and large absorption coefficients. Their exceptional optoelectronic properties, lower fabrication cost and levelized cost of electricity
are, however, hampered by their insufficient stability, which leads to a short operational
lifetime and limits their application in optoelectronic devices, hindering from full-scale
commercialization. In recent years, many approaches have been explored to boost the
stability of perovskites without sacrificing their device performance. One emerging concept consists in low-dimensional engineering, achieved through the incorporation of large
organic cations between hybrid perovskite slabs. These organic moieties can be halogenated and be consequently able to interact with halide anions, typically present in
halide perovskites, giving rise to an alternative noncovalent interaction, named halogen
bonding. In this work several XB-donor cations have been selected for the synthesis
of different low-dimensional perovskite structures, whose ability to form halogen bond
was subsequently analysed. In particular, 4-iodoanilinium (IA+) cation has been used
to form bis(4-iodoanilinium) tetraiodoplumbate perovskite, in whose structure the occurrence of XB between organic and inorganic domains has been proven and its strength
has been investigated, revealing a relatively weak interaction. Aiming to study a much
stronger XB, hydrogen substitutions by fluorine atoms strategy has been applied. (4-X 2,3,5,6-tetrafluoroaniline)-ethan-1-ammonium cations (X-FEA+) (X=I, Br, Cl) have been
therefore used to synthesise low-dimensional perovskites, following different procedures.
The resulting fluorinated perovskites have been synthetised, purified, and characterised
by 1H NMR, 19F NMR, MS, XRPD and SCXRD to understand their final crystalline
structures, and to investigate the strength of their XB interactions, if there were any.
This study suggests that XB can occur under specific synthesis conditions, that allow
to shorten the halogen-halogen distance and to increase the linearity of the XB, resulting in a much stronger interaction. Tunability of halogen-halogen bond can be exploited
as a powerful tool to control structure and photophysical properties in low-dimensional
perovskites, further improving the commercialization potential of perovskite-based optoelectronic devices
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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