1,721,053 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
SIMULTANEOUS DETERMINATION OF RHODIUM AND GOLD BY DERIVATIVE SPECTROPHOTOMETRY METHOD
No full textRhodanine and its derivatives are used for the quantitative analysis ofsilver, gold (III), palladium (II), copper (1) and (II), rhodium (III), mercuryand other ions / I/.p-dimethylaminobenzylidene rhodanine (p-DABR) was first proposed asan analytical reagent by Feigl. It is widely used for separation and spectrophotometric determination of Ag and Pd. It is also used as a reagent for Au,Hg and Pt, for indirect determination of CI" and CN", as an acid-base indicatorin acetic acid medium, and in selective resins /2,3/. Gelatin or gum Arabic isutilized to stabilize the formed complexes. Drawbacks of these methods arethe limited solubility of the reagent and instability of the reaction products/4/. On the other hand, surfactants and micellar systems are currently used toimprove the sensitivity and/or selectivity of the spectrophotometric methodsfor metal ion determination. Such systems manipulate the solubility and micro environment of reagents and analytes, and control the reactivity,equilibrium and pathway of chemical or photochemical processes /5,6/.In the present paper, the reactions of Au (III) and Rh (III) with p-DABRin the presence of cationic [cetyltrimethylammonium bromide, CTAB]surfactant have been studied. Simultaneous photometric determination of Au(III) and Rh (III) is hampered due to spectral overlap of their complexes. Insuch cases spectrophotometry coupled with derivative techniques is useful inanalysis of such mixtures Π-91. In this work derivative spectrophotometrywas also used to improve the sensitivity and selectivity /ΙΟ,II/. As theproposed methods are practically free from interferences, they have beenapplied to Rh (III) and Au (III) determination in synthetic samples. </p
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
DETERMINATION OF THE STABILITY CONSTANTS OF THE PROTON AND Co(II), Ni(II), Cu(II), Zn(II), Fe(III) COMPLEXES OF 3,5-DIMETHYL TETRAHYDRO-1,3,5-THIADIAZINE-2-THIONE BY THE POTENTIOMETRIC METHOD
No full textDazomet (DTTT), (tetrahydro-3,5-dimethyl-2H-1,3,5-thiadiazine-2-thione) is soil fumigant used to controlweeds, soil fungicide, insects and nematodes. DTTT was synthesized and purified according to literature. Theprotonation constant of DTTT in water-ethanol 70:30(v%) solution was determined by potentiometrictitration at constant temperature, t = (25±0.10C) and 0.06 M NaClO4 as ionic background. The formationconstants of DTTT with Cu(II), Ni(II), Co(II), Zn(II), and Fe(III) were determined at the same conditions.Purified nitrogen gas bubbled through the titrated solution to ensure stirring and neutral inert atmosphere.Furthermore, the solution was stirred magnetically. The solutions were titrated with 5.10-3 M NaOH inincrements of 0.1 mL. The corresponding change in the pH value of the solution was measured. Thestochiometric protonation constants of the ligand were calculated using software called TITFIT developed byZuberbühler and Kaden(1). The formation constant of DTTT complexes with Cu(II), Ni(II), Co(II), Zn(II),Fe(III) and species distribution curves were calculated and plotted using TITFIT computer program. Thevalues of the protonation constants for the ligand are log β1 = 9.49 (∆=2.36.10-2) and log β2= 13.50(∆=2.38.10-2). The order of the stability constants of ML complexes with DTTT is Fe>Cu>Co>Ni>Zn andthat of MLH complexes is Co>Cu>Fe>Ni>Zn. </p
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