1,721,078 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
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Synthesis of Doped Graphene Nanoribbons from Molecular and Polymeric Precursors
Get PDFAbstract Synthesis of Doped Graphene Nanoribbons from Molecular and Polymeric Precursorsby Ryan Randal ClokeDoctor of Philosophy in ChemistryUniversity of California, Berkeley Professor Felix Fischer, Chair As electronic devices continue to shrink and energy problems continue to grow, nanoscale materials are becoming increasingly important. Graphene is a material with exceptional promise to complement silicon in next-generation electronics because of its extraordinary charge carrier mobility, while also finding a role in cutting-edge energy solutions due to its high surface area and conductivity. Improving on this material even further by reducing the width of graphene to nanoscale dimensions with atomically-precise dopant patterns is the subject of this thesis. Nanometer-wide strips of graphene, known as graphene nanoribbons (GNRs), offer the advantages of semiconducting behavior, combined with more accessible surface area compared to bulk graphene (Chapter 1). Additionally, it is demonstrated that GNRs can be doped with atomic precision, allowing for intricate modulation of the electronic properties of this material, which was studied by STM, STS, and nc-AFM (Chapter 2). Controlled growth of GNRs on surfaces is still an outstanding challenge within the field, and to this end, a variety of porphyrin-GNR template materials were synthesized (Chapter 3). The GNRs obtained in this work were also synthesized in solution, and it was shown that these materials possess excellent properties for applications in hydrogen storage, carbon dioxide reduction, and Li-ion batteries (Chapter 4). A prerequisite for solution-synthesized GNRs, conjugated aromatic polymers are an important class of materials in their own right. Therefore, Ring-Opening Alkyne Metathesis Polymerization was developed using conjugated, strained diynes (Chapter 5). The resulting conjugated polymers were explored both for their own materials properties due to a remarkable self-assembly process that was discovered, and also as precursors to GNRs (Chapter 6). This work advances the fundamental understanding of carbon-based nanostructures, as well as the large-scale production of GNRs for next-generation energy and electronics applications
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Substitutional Heteroatom Doping and Topological Band Engineering in Graphene Nanoribbons
Get PDFThe exponentially increasing demand for smaller, faster, and more energy efficient electronic devices represents a monumental challenge in designing the next generation of post-silicon functional electronic materials. Traditionally, device architectures based on organic/inorganic semiconductors are fabricated using a top-down approach; their performance is inherently limited by the spatial resolution of photolithographic techniques. Fischer group’s goal is to understand, control, and to be able to harness the exceptional electronic/magnetic properties emerging from nanoscale graphitic materials by developing novel synthetic strategies toward graphene nanoribbons (GNR) via bottom-up synthesis from atomically defined molecular precursors. The semiconducting properties of GNRs can be modulated by varying their width, edge structure and the identity of atoms in the periodic lattice.My thesis work will detail the power of organic synthesis in design of molecular precursors en route to GNRs, the nanoribbon formation analysis techniques, and the outlook toward application of GNRs in a low-power, tunneling field-effect transistor device architecture (Chapter 1). A large part of my work has aimed at developing new synthetic strategies to access heteroatom-substituted GNRs. After making advances toward BN-substituted GNR precursors, I have discovered a molecular scaffold which furnishes the first example of a surface-mediated C–N bond formation in the context of a 7-AGNR segment (Chapter 2). I have also prepared a series of molecular precursors that have led to the formation of a new family of nitrogen-substituted zigzag GNRs, which possess intriguing spin-separated states along the edges (Chapter 3). In addition to exploring heteroatom substitution, I investigated all-carbon GNR scaffolds that utilize topological band engineering concepts in order to explore new variables that will allow rational tuning of electronic properties in GNRs. I have prepared multiple precursors to continue the realization of topologically protected interface states in GNRs, which are generated by construction of a superlattice of well-defined ribbon segment heterojunctions (Chapter 4)
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