1,720,962 research outputs found
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
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
Isomer -specific spectroscopy and conformational isomerization energetics of flexible benzene derivatives
No full textMy thesis research investigated the spectroscopy and dynamics of molecules involved in key steps leading toward soot formation in combustion environments. A critical feature of models of combustion is something shared by many areas of science; namely, the need to assess and characterize the role played by structural isomers in chemistry. In this thesis structural isomers of benzene derivatives, some of which lead directly to polyaromatic hydrocarbon formation, were studied. A supersonic jet was used to cool these molecules into their zero-point levels. Then, various laser-based spectroscopies were used to provide the infrared and ultraviolet spectral signatures of individual structural isomers free from interference from one another. Unique infrared and ultraviolet spectral signatures of ortho-, meta-, and para-ethynyl styrenes (oES, mES, and pES), para- and meta-divinylbenzene (pDVB and mDVB), 3-benzyl-1, 5-hexadiyne (BHD), 5-phenyl-1-pentyne (PP), and 4-phenyl-1-butyne (PB) were obtained. These studies showed that mES, mDVB, BHD, PP, and PB all have multiple conformations present in the expansion. Assignments of individual conformations were made for BHD, PP, and PB based on the observed and calculated frequencies in the alkyl and acetylenic CH stretch regions, S0-S1 electronic origin shifts, and rotational band contour analysis. High resolution fluorescence excitation studies were used to assign the two conformations of m ES. Armed with this foundation of spectroscopic data on individual conformational isomers, detailed studies of the conformational isomerization dynamics were carried out on mES and mDVB. These studies used the method of stimulated emission pumping-population-transfer spectroscopy (SEP-PT) as a means to place narrow bounds on the energy thresholds for isomerization between individual reactant-product isomer pairs. This method utilizes selective excitation of a single conformation by means of SEP in the early portions of the gas-phase expansion, followed by collisional re-cooling of the vibrationally excited population into the conformational minima for subsequent conformation-specific detection. These studies were used to determine the thresholds for isomerization, the relative energies of the different conformations in the ground state, and the pathways for isomerization. In addition, single vibronic level fluorescence studies were used to fit the vinyl torsional levels observed in m DVB to obtain the barrier to isomerization in a second manner
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
THE INFRARED AND ULTRAVIOLET SPECTROSCOPY OF JET-COOLED ORTHO-, META-, and PARA-ETHYNYLSTYRENE
No full textAuthor Institution: Department of Chemistry, Purdue UniversityVibronic spectroscopy of ortho-, meta-, and para-ethynylstyrene (OES, MES, and PES) was studied by resonant two photon ionization (R2PI). The origins of the OES and PES are and , respectively. In the MES, there are two possible conformations that occur close in energy. In the R2PI spectrum of MES the two most prominent peaks occur at and . UV-UV holeburning (UVHB) spectroscopy confirmed that these transitions are due to the two different conformations of MES. There are also two possible conformations in OES, but calculations suggest that the conformation with the substituents pointing towards each other should only be about of the room temperature population. The UVHB spectrum of OES confirms that only one conformer is present. In the R2PI spectra of each of these isomers there is evidence of vibronic coupling of the state to an excited electronic state. Ground state infrared spectra in the C-H stretch region were obtained using resonant ion-dip infrared spectroscopy (RIDIRS). In all three isomers, the acetylenic C-H stretch fundamental was split by Fermi resonance. Infrared spectra were also recorded in the excited electronic state using a UV-IR-UV version of RIDIR spectroscopy. In all three isomers the acetylenic C-H stretch fundamental was unshifted from the ground state, but no Fermi resonance was seen. Experiments designed to measure the barrier to isomerization of the vinyl group will also be discussed
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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