1,720,956 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
Micro-CT, Histomorphometric and Immunohistological Analysis of 3D-Printed PLLA/CaCO3 Scaffolds Supplemented with CaPO4 in the Göttinger Minipig for the Development of a Patient-Specific, Resorbable Bone Substitute Material
No full textEinleitung:
Eine der zentralen Herausforderungen in der Mund-, Kiefer- und Gesichtschirurgie ist die rekonstruktive Versorgung von Gewebedefekten nach umfangreichen Tumorresektionen im Kopf-Hals-Bereich. Der mikrovaskuläre freie Gewebetransfer spielt in diesem Bereich nach wie vor eine zentrale Rolle. Obwohl die autologe Knochentransplantation derzeit als Goldstandard gilt, erfordert sie ein zweites Operationsgebiet und birgt damit zusätzliche Morbidität und damit verbundene Risiken. Daher sind die Entwicklung und Implementierung effektiver Knochenersatzmaterialien von größter Bedeutung, um den Bedarf an autologen Transplantaten zu vermeiden.
Ziel dieser Studie war es, das Ausmaß der De-novo-Knochenbildung durch Calciumcarbonat (CaCO₃)- basierte Komposit-Scaffolds zu bewerten und den Einfluss der Scaffold-Architektur auf die Osteogenese zu untersuchen.
Materialien und Methoden:
Zehn Göttinger Minischweine wurden randomisiert zwei Gruppen entsprechend den Evaluationszeitpunkten (4 und 12 Woche) zugeteilt. Vier verschiedene Poly-Lactid (PLLA)/CaCO₃-Kompositgerüste mit unterschiedlichen Stegabmessungen, teilweise ergänzt mit Calciumphosphat (CaPO₄), wurden in 5×7 mm große, zylindrische Defekte implantiert, die mit einem Trepanbohrer erzeugt wurden. Die Ergebnismessungen umfassten eine computertomografische (CT) volumetrische Knochenanalyse in mm³ und eine histomorphometrische Untersuchung in mm², wobei drei vordefinierte Regionen und die Knochen-Gerüst-Grenzfläche im Mittelpunkt standen. Der immunhistochemische Nachweis von Osteocalcin diente der Bewertung des Mineralisationsgrads und der Ableitung der Knochenregenerationsrate.
Ergebnisse:
Die histomorphometrische Analyse mittels Smith Karagianes und Van-Gieson Färbung ergab keine statistisch signifikanten Unterschiede zwischen den Gruppen. In der Scaffold-Gruppe PK4 wurden jedoch signifikante Unterschiede in der Knochenbildung mittels CT-Bildgebung und Osteocalcin-Expression festgestellt. Die Analyse der Scaffold-Knochen-Kontaktfläche zeigte keine signifikanten Unterschiede zwischen den Gruppen. Insgesamt zeigten Scaffolds mit höherer Porosität (PK2 und PK4) eine leicht verbesserte Knochenbildung. Die CaPO4-Beschichtung führte nicht zu einer statistisch signifikanten Verbesserung der Osteogenese, verbesserte jedoch die mechanische Stabilität und die Handhabungseigenschaften. Nach 12 Wochen waren die Porenvolumina der meisten Scaffolds nahezu vollständig mit neu gebildetem Knochen ausgewachsen, was ihre Eignung als osteokonduktives Material bestätigte.
Dabei zeigte sich ein Trend in der Scaffold-Zusammensetzung, der wie folgt geordnet war: PK1 < PK3 < PK2 < PK4.
Schlussfolgerungen:
Die Calciumphosphat-Oberflächenmodifizierung verbesserte die Knochenregeneration nicht signifikant, ermöglichte aber eine verbesserte intraoperative Handhabung, insbesondere bei Scaffolds mit kleineren Porengrößen. Sowohl nach vier als auch nach zwölf Wochen orientierte sich die Knochenneubildung vorwiegend an der Gerüststruktur, was deren Rolle als effektive osteokonduktive Führung unterstreicht. Nach zwölf Wochen zeigte sich eine starke Korrelation zwischen der Gerüstporosität und dem Knocheneinwuchs. Eine höhere Porosität förderte eine schnellere und umfassendere Knochenbildung, was die Gerüststruktur als entscheidenden Faktor für den regenerativen Erfolg darstellt.Introduction:
One of the central challenges in oral and maxillofacial surgery is the reconstructive restoration of tissue defects following extensive tumor resections in the head and neck region. Microvascular free tissue transfer continues to play a central role in this field. While autologous bone grafting is currently regarded as the gold standard, it necessitates a secondary surgical site, thereby introducing additional morbidity and associated risks. Consequently, the development and implementation of effective bone substitute materials are of paramount importance to obviate the need for autologous grafts.
This study aimed to evaluate the extent of de novo bone formation facilitated by calcium carbonate (CaCO₃) -based composite scaffolds and to investigate the influence of scaffold architecture on osteogenesis.
Materials and Methods:
Ten Göttinger minipigs were randomly assigned to two groups corresponding to evaluation time points (4 and 12 weeks). Four distinct poly-L-lactide (PLLA)/CaCO₃ composite scaffolds with varying bar dimensions, partially supplemented with calcium phosphate (CaPO4), were implanted into 5×7 mm cylindrical defects created by a trephine drill. Outcome measures included computed tomography (CT)-based volumetric bone analysis in mm³ and histomorphometric assessment in mm², focusing on three predefined regions and the bone–scaffold interface. Immunohistochemical detection of osteocalcin was used to evaluate the degree of mineralization and infer the rate of bone regeneration.
Results:
Histomorphometric analysis using Smith Karagianes and Van Gieson staining did not yield statistically significant differences among groups. However, significant differences in bone formation were identified in scaffold group PK4 through CT imaging and osteocalcin expression. Scaffold-bone contact area analysis showed no significant differences across groups. Overall, scaffolds with higher porosity (PK2 and PK4) demonstrated slightly enhanced bone formation. The presence of a CaPO4 coating did not result in a statistically significant improvement in osteogenesis, although it improved mechanical stability and handling characteristics. After 12 weeks, the pore volumes of most scaffolds were nearly completely infiltrated by newly formed bone, confirming their suitability as osteoconductive matrices.
A trend in scaffold performance was observed, ordered as follows: PK1 < PK3 < PK2 < PK4.
Conclusions:
The calcium phosphate surface modification did not significantly enhance bone regeneration but facilitated improved intraoperative handling, particularly in scaffolds with smaller pore sizes. At both 4 and 12 weeks, new bone formation was predominantly aligned along the scaffold architecture, underscoring their role as effective osteoconductive guides. By 12 weeks, scaffold porosity showed a strong correlation with bone ingrowth, with higher porosity promoting faster and more extensive bone formation, highlighting scaffold architecture as a critical determinant in regenerative outcomes.2025-08-0
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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