1,721,027 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
Intrinsic-Unsaturation-Enriched Biporous and Chemorobust Cu(II) Framework for Efficient Catalytic CO2 Fixation and Pore-Fitting Actuated Size-Exclusive Hantzsch Condensation with Mechanistic Validation
No full textCarbon
dioxide (CO2) utilization and one-pot Hantzsch
condensation denote two important protocols pertinent to sustainable
agenda because of the obvious advantages like reduction in chemical
usage, short reaction time, and minimum waste generation. To this
end, the astute combination of optimum-sized pore structure with built-in
Lewis acid center in metal–organic frameworks (MOFs) can bring
about such reactions under energetically favorable conditions and
offer a step forward to size-exclusive catalysis. The chemoresistant
and twofold interpenetrated Cu(II) framework CSMCRI-13 (CSMCRI = Central Salt & Marine Chemicals Research Institute)
is built from a C3-symmetric tricarboxylate
ligand and an N,N′-donor
linker that undergo incisive amalgamation of the paddle-wheel [Cu2(COO)4] secondary building unit (SBU) and the intrinsically
unsaturated Cu(II) node with four coordination. The microporous structure
features a dual-pore containing cage-like network with free oxygen-atom-enriched
cavities and exhibits appreciable CO2 adsorption with moderate
MOF-CO2 interaction in activated form (13a). Benefitting from both, the coordinatively frustrated metal center
containing MOF acts as a highly synergistic and solvent-free catalyst
in CO2 cycloaddition reaction under an 8 bar CO2 pressure at 70 °C in 6 h. The catalyst furnished admirable
reactivity and fair recyclability with a wide range of substrates,
wherein sterically encumbered and long-chain epoxides produced poor
conversion. This MOF further executes highly regenerable Hantzsch
condensation reaction under mild condition with superior activity
to contemporary materials, where most of the 1,4-dihydropyridine derivatives
are additionally characterized through the single-crystal X-ray diffraction
analysis. Importantly, mechanistic proof of the tricomponent condensation
involving built-in Lewis acid sites is validated from several control
experiments and in-depth analytical studies. To the best of the single-step
multicomponent reaction, substrate molecules having incompatible molecular
dimension to that of pore size of the framework resulted insignificant
conversion and demonstrated the first-ever pore-fitting-induced size
selectivity in Hantzsch condensation
Largely Entangled Diamondoid Framework with High-Density Urea and Divergent Metal Nodes for Selective Scavenging of CO<sub>2</sub> and Molecular Dimension-Mediated Size-Exclusive H‑Bond Donor Catalysis
No full textPore
environment modulation with high-density polarizing groups
in metal–organic frameworks (MOFs) can effectively accomplish
selective and multicyclic carbon dioxide (CO2) adsorption,
whereas the incorporation of task-specific organic sites inside these
porous vessels promise to evade self-quenching, solubility, and recyclability
issues in hydrogen-bond donating (HBD) catalysis. However, concurrent
amalgamation of both these attributes over a single platform is rare
but extremely demanding in view of sustainable applications. We designed
a robust diamondoid framework CSMCRI-17 (CSMCRI = Central
Salt and Marine Chemicals Research Institute) from the mixed-ligand
assembly of azo group-containing dicarboxylate ligand, urea-functionalized
pyridyl linker, and Zn(II) nodes with specific divergent coordination.
Seven-fold interpenetration to the microporous structure largely augments N-rich functionality that facilitates high CO2 uptake in the activated form (17a) with good CO2 selectivity over N2 and CH4 that outperform
many reported materials. The framework displays very strong CO2 affinity and no reduction in adsorption capacity over multiple
uptake–release cycles. Benefitting from the pore–wall
decoration with urea functionality from the pillaring strut, 17a further demonstrates hydrogen-bond-mediated Friedel–Crafts
alkylation of indole with β-nitrostyrene under mild conditions,
with multicyclic usability and excellent reactivity toward wide ranges
of substituted nucleophiles and electrophiles. Interestingly, interpenetration-generated
optimum-sized pores induce poor conversion to sterically encumbered
substrate via molecular dimension-mediated size selectivity that is
alternatively ascribed from additional control experiments and support
the occurrence of HBD reaction within the MOF cavity. The catalytic
path is detailed in light of the change of emission intensity of the
framework by the electrophile as well as the judicious choice of the
substrate, which authenticates the prime role of urea moiety-governed
two-point hydrogen bonding
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
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
- …
