1,721,005 research outputs found
4-Hydroxybenzamide 1,4-dioxane hemisolvate
No full textThe asymmetric unit of the title compound, C7H7NO2·0.5C4H8O2, is composed of one 4-hydroxybenzamide molecule and half of a 1,4-dioxane molecule. The complete dioxin molecule is generated by crystallographic inversion symmetry. The crystal has an extensive system of hydrogen bonds, in which the three donor H atoms are fully utilized: these result in amide–amide homodimers, and N—H...O(dioxane) and O—H...O(amide) links
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
Carbazole Substituted Amidinato Silylene: Synthesis Bonding, and Coordination Behavior with Coinage Metals
No full textIn
this work, the synthesis and characterization of a new carbazole
substituted amidinatosilylene (1) and its coinage metal
complexes 3–8 are being reported.
Before the complexation reactions, we prepared [PhC(NtBu)2Si(Cbz)→Co(CO)Cp] complex (2) to estimate
the σ-donating strength of the newly synthesized silylene 1. Further, several commonly available coinage metal salts
were utilized for the complexation reactions with 1,
which afforded complexes 3–8. The
solid-state structures of 1–8 have
been validated by single-crystal X-ray diffraction studies, NMR spectroscopy,
and mass spectroscopy. DFT studies were also performed to understand
the bonding scenario of 1 and 3–7. Of note, 1 consists of a HOMO on its carbazolide
moiety, and the HOMO-1 features the silylene character. We also compared
the HOMO-LUMO gap of 1 with other amidinato silylenes
having different N-substitutions
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
Synthon Modularity in 4‑Hydroxybenzamide–Dicarboxylic Acid Cocrystals
No full textA family of 4-hydroxybenzamide–dicarboxylic acid
cocrystals has been designed and subsequently isolated and characterized.
The design strategy follows from an understanding of synthon modularity
in crystal structures of monocomponent crystals such as γ-quinol,
4,4′-biphenol and 4-hydroxybenzoic acid. These monocomponent
structures contain infinite O–H···O–H···O–H···
cooperative synthons linked with molecular connectors such as phenyl
and biphenyl, and supramolecular connectors such as the acid dimer
in 4-hydroxybenzoic acid. The cocrystal design was influenced by the
anticipation that dicarboxylic acids can form a supramolecular connector
mediated by acid–amide synthons with 4-hydroxybenzamide, which
can then form the phenol O–H···O–H···O–H···
infinite synthon. Effectively, the acid–amide and phenol synthons
are insulated. The short axis of such a structure will be around 5.12
Å and this is borne out in 2:1 cocrystals of 4-hydroxybenzamide
with oxalic, succinic, fumaric, glutaric (two forms) and pimelic acids.
Hydrated variations of this structure type are seen in the cocrystals
obtained with adipic and sebacic acids
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
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