1,720,960 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Full text linkWe 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
Substitution of labile triflate in [(triphos)Re(CO)(2)(OTf)]: a new synthetic route to mononuclear and dinuclear Re(I) complexes
No full textNew synthetic routes to the neutral complex [(triphos)Re(CO)2(OTf)] [triphos=MeC(CH2PPh2)3, OTf=CF3SO3-] (3) are reported. The triflate ligand in 3 is labile and can be easily replaced by different halides and pseudohalides (CN-, N3-, SCN-, SeCN-, OCN-) to give new mononuclear octahedral ReI complexes of formula [(triphos)Re(CO)2(X)] (X=Cl-, Br-, I-, CN-, N3-, SCN-, SeCN-, OCN-). In some cases, when a double proportion of 3 is treated with the appropriate pseudohalide, rare examples of binuclear ReI complexes featuring a single bridging pseudohalide ligand, [{(triphos)Re(CO)2}2(μ-X)]Y (X=CN-, N3-, SCN-, SeCN-; Y=OTf, BPh4-), have been obtained. All of the new ReI complexes have been characterized by conventional spectroscopic methods and by electrochemical and spectroelectrochemical techniques. Selected examples of regioselective electrophilic alkylations of both halide and pseudohalide ligands are also reported. Noticeably, selective methylation of [(triphos)Re(CO)2(η1-X-XCN)] (X=S, Se) affords the complexes [(triphos)Re(CO)2{η1-X-X(Me)(CN)}]OTf, which contain the unprecedented methylsulfocyanate and methylselenocyanate ligands
OMiR: Identification of associations between OMIM diseases and microRNAs.
No full textA large number of loci for genetic diseases have been mapped on the human genome and a group of hereditary diseases among them have thus far proven unsuccessful to clone. It is conceivable that such “unclonable” diseases are not linked to abnormalities of protein coding genes (PCGs), but of non-coding RNAs (ncRNAs). We developed a novel approach termed OMiR (OMIM and miRNAs), to test whether microRNAs (miRNAs) exhibit any associations with mapped genetic diseases not yet associated with a PCG. We found that “orphan” genetic disease loci were proximal to miRNA loci more frequently than to loci for which the responsible protein coding gene is known, thus suggesting that miRNAs might be the elusive culprits. Our findings indicate that inclusion of miRNAs among the candidate genes to be considered could assist geneticists in their hunt for disease genes, particularly in the case of rare diseases
Substitution of labile triflate in [(triphos)Re(CO)2(OTf)]: A new synthetic route to mononuclear and dinuclear Re(I) complexes
No full textNew synthetic routes to the neutral complex [(triphos)Re(CO)2(OTf)] [triphos = MeC(CH2PPh2)3, OTf = CF3SO3-] (3) are reported. The triflate ligand in 3 is labile and can be easily replaced by different halides and pseudohalides (CN-, N3-, SCN-, SeCN-, OCN-) to give new mononuclear octahedral Re(I) complexes of formula [(triphos)Re(CO)2(X)] (X = Cl-, Br- , I-, CN-, N3-, SCN-, SeCN-, OCN-). In some cases, when a double proportion of 3 is treated with the appropriate pseudohalide, rare examples of binuclear Re1 complexes featuring a single bridging pseudohalide ligand, [{(triphos)Re(CO)2}2(μ-X)]Y (X = CN-, N3-, SCN-, SeCN-; Y = OTf, BPh4-), have been obtained. All of the new Re(I) complexes have been characterized by conventional spectroscopic methods and by electrochemical and spectroelectrochemical techniques. Selected examples of regioselective electrophilic alkylations of both halide and pseudohalide ligands are also reported. Noticeably, selective methylation of [(triphos)Re(CO)2(η1-X- XCN)] (X = S, Se) affords the complexes [(triphos)Re(CO)2{η1-X- X(Me)(CN)}]OTf, which contain the unprecedented methylsulfocyanate and methylselenocyanate ligands
- …
