1,720,995 research outputs found
O’Leary, Patrick S.
No full textTranscript of Michigan State Police record forwarded to the Transient Bureau of Kalamazoo County, under the Federal Emergency Relief Administration, May 1933 - June 1943
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
Non–nucleophilic grignard synthesis of chiral bridged pyridine–oxazoline ligands for asymmetric catalysis
No full textThe enantioselective synthesis of chiral compounds, such as those required by the pharmaceutical industry, is an important tool in synthetic organic chemistry. Chiral catalysis is one tool used to achieve these syntheses and as such development of chiral enantiopure ligands is of upmost importance. Pyridine–oxazoline ligands have found widespread application in asymmetric catalysis. Surprisingly, however, research into PYOX ligands containing a carbon spacer between the pyridine and oxazoline rings has remained limited to just a few reports in the literature, and an extensive investigation into their synthesis and use as asymmetric catalysts has never been completed. Chapter 2 details the development of a synthetic route to novel bridged pyridine–oxazoline ligands. The ligands were prepared in two efficient steps (Scheme 1), initially preparing 2– pyridyl alkylnitriles, followed by their conversion into oxazolines ligands using chiral amino alcohols and zinc chloride. The 2–pyridyl nitriles were prepared via a novel SNAr alkylation reaction of 2–bromopyridine with alkyl nitriles using methylmagnesium chloride as a non– nucleophilic base in conjunction with an amine mediator. Metal complexes of these ligands were applied to several transition–metal catalysed test reactions including the allylic alkylation, Alder–Ene, Henry and the cyclopropanation reaction. The palladium complexes gave good conversions (up to 100%) and moderate enantioselectivities (up to 68%) in the asymmetric allylic alkylation reaction. This research has resulted in a recent publication in Synlett. The copper complexes of these ligands gave modest conversions (up to 73%) but low ee values (32%) in the asymmetric Alder–Ene. In the asymmetric Henry reaction, the copper complexes provided high conversions (up to 97%) and moderate ee values (up to 68%). The ligands were also screened in the asymmetric cyclopropanation reaction, where conversions of up to 84% were achieved, but low ee values (up to 30%). The work clearly established that functionalisation on the bridging carbon has a substantial impact on the resulting catalysts stereoselectivity. Scheme 1: Two–step synthetic route to chiral PYOX ligands Chapter 3 provides an in–depth exploration of the synthesis of phenyl–substituted bridged PYOX ligands. The synthesis of the nitriles again used a SNAr reaction. The corresponding phenyl–substituted bridged PYOX ligands were successfully synthesized. These ligands were very liable with easy reaction at the acidic bridgehead C–H. This led to difficulty in isolating single stereoisomers of the ligands. The discovery of zinc complexes of the ligands opened up an alternative approach for isolation of zinc complexes of single stereoisomers of these ligands (Scheme 2). This newfound method facilitates the isolation process but also allows their application as catalytic precursors in asymmetric catalytic reactions. Scheme 2: Synthesis of a phenyl–substituted PYOX–ZnCl2 ligand. In Chapter 4, a novel three–step synthetic pathway for the production of alkyl phenyl– substituted bridged PYOX ligands is outlined (Scheme 3). The ligand synthesis allowed for two stereochemistries at the bridgehead with a single chiral configuration at the oxazoline. The resulting diastereomers could in most cases be separated allowing access to single enantiomers of diastereomers for testing. The stereochemistry of the stereocentre at the bridging carbon of a novel PYOX ligand was determined by X–ray crystallography of a PYOX–CuCl2 complex. The ligands were applied to three asymmetric reactions and the catalytic results are reported.2026-06-2
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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