1,721,033 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
The synthesis and characterization of aryl oxiranes, 1984
Full text linkEpoxides of indene, 1 phenyl indene, l phenyl l,2,3,4 tetrahydronaphtha lene, 2 methyl l,2,3,4 tetrahydronaphthalene, 1 methyl 1,2,3,4 tetrahydronaph thalene, and l,2 dimethyl l,2,3,4 tetrahydronaphthalene were synthesized using m chloroperoxybenzoic acid in a two phase system. The ethylenic precursors, except indene, were prepared in a series of articulated steps beginning with a Grignard synthesis of the phenyl or methyl derivative of the parent ketonic compound. Characterizations of ail intermediates and epoxides were established by I.R., lH NMR and T.L.C
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
Equilibrium and Kinetics Studies of the Adsorption of Basic Dyes onto PVOH Facilely Intercalated Kaolinite - A Comparative Study of Adsorption Efficiency
Full text linkChigbundu C. Emmanuel* and Adebowale O. Kayode
Most basic dyes are known for their toxic impact on the environment, especially in the aquatic ecosystem. . Unfortunately, consistent discharge of dye containing wastes into most water bodies has generated serious challenges, which can only be solved through consistent research approaches. his study is designed to compare the adsorption capacities of purified (PRK) and polyvinyl alcohol (PVOH) intercalated raw kaolinite (PIK) for the adsorption of some basic dyes from an aqueous solution. Scanning electron microscope (SEM) with energy dispersive X-ray (EDX), Fourier-transform infrared (FTIR) Spectroscopy and X-ray diffractometer (XRD) were used to verify changes in morphology, surface functional groups and crystal lattice sequence adjustment in PIK adsorbent. Cation Exchange Capacity (CEC) and Point of Zero Charge (PZC) of both adsorbents were determined by methylene blue adsorption and salt addition technique, respectively. The adsorption characteristics of both adsorbents were investigated under various conditions such as varying adsorbent dosages, period of contact, temperature and pH. Thermodynamic parameters were used to evaluate the effect of temperature on the adsorption process, while non-linear regressions were used to fit the experimental data to various adsorption and kinetic models. UV-visible spectrometer was used to determine the absorbance of dyes left in the solution un-adsorbed throughout the experimental study. The morphology of PIK revealed a compacted structure with pores, while the crystal lattice adjustment of PIK showed basal plane contraction to 4.06Å when compared with PRK respectively. Surface functionality study revealed several peaks such as CH3 and CH2 assigned to 2893 and 2990 cm-1 respectively on PIK but absent on the FTIR graph of PRK. The adsorption isotherm model showed that PIK was twice efficient for the uptake of BR2 and BG5 compared to PRK. The Elovich model equation suitably described the adsorption kinetics while the thermodynamic parameters revealed that the adsorption was spontaneous and endothermic. In comparison to other desorption agents, acetic acid was found to be a good desorption agent
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
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