1,721,081 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
Synthesis of fully dehydrated partially Cs(+)-exchanged zeolite Y (FAU, Si/Al=1.56), vertical\ua0bar Cs(45)Na(30) vertical\ua0bar [Si(117)Al(75)O(384)]-FAU and its single-crystal structure
No full textLarge single crystals of zeolite, |Na|[SiAlO]-FAU (Na-Y, Si/Al = 1.56), were synthesized from gels with composition of 3.58SiO: 2.08NaAlO: 7.59NaOH: 455HO: 5.06TEA: 2.23TCl. One of these, a colorless single-crystal was ion exchanged by allowing aqueous 0.02 M CsOH to flow past the crystal at 293 K for 3 days, followed by dehydration at 673 K and 1 × 10 Torr for 2 days. The crystal structure of fully dehydrated partially Cs-exchanged zeolite Y, |CsNa|[SiAlO]-FAU per unit cell (a = 24.9080(10) Å) was determined by single-crystal X-ray diffraction technique in the cubic space group Fd 3 m at 294(1) K. The structure was refined using all intensities to the final error indices (using only the 877 reflections with F > 4σ(Fo)) R = 0.0966 (Based on F) and R = 0.2641 (Based on F). About forty-five Cs ions per unit cell are found at six different crystallographic sites. The 2 Cs ions occupied at site I, at the centers of double 6-ring (D6Rs, Cs-O = 2.774(10) Å and O-Cs-O = 88.9(3) and 91.1(3)°). Two Cs ions are found at site I' in the sodalite cavity; the Cs ions were recessed 2.05 Å into the sodalite cavity from their 3-oxygen plane (Cs-O = 3.05(3) Å and O-Cs-O = 77.4(13)°). Site-II' positions (opposite single 6-rings in the sodalite cage) are occupied by 7 Cs ions, each of which extends 2.04 Å into the sodalite cage from its 3-oxygen plane (Cs-O = 3.067(11) Å and O-Cs-O = 80.1(3)°). The 26 Cs ions are nearly three-quarters filled at site II in the supercage, being recessed 2.34 Å into the supercage (Cs-O = 3.273(8) Å and O-Cs-O = 74.3(3)°). The 4 Cs ions are found at site III deep in the supercage (Cs-O = 3.321(19) and 3.08(3) Å), and 4 Cs ions at another site III' (Cs-O = 2.87(4) and 3.38(4) Å). About 30 Na ions per unit cell are found at one crystallographic site; The Na ions are located at site I' in the sodalite cavity opposite double 6-rings (Na-O = 2.578(11) Å and O-Na-O = 97.8(4)°)
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
Single-crystal structure of fully dehydrated and largely NH(4)(+)-exchanged zeolite Y (FAU, Si/Al=1.70), vertical bar(NH(4))(60)Na(11)vertical bar[Si(121)Al(71)O(384)]-FAU
No full textThe single-crystal structure of largely ammonium-exchanged zeolite Y dehydrated at room temperature (293 K) and 1 x 10(-6) Torr. has been determined using synchrotron X-radiation in the cubic space group Fd (3) over barm (a 24.9639(2) angstrom) at 294 K. The structure was refined to the final error index R-1 = 0.0429 with 926 reflections where F-o > 4 sigma(F-o); the composition (best integers) was identified as vertical bar(NH4)(60)Na-11 vertical bar[Si121Al71O384]-FAU. The 11 Na+ ions per unit cell were found at three different crystallographic sites and 60 NH4+ ions were distributed over three sites. The 3 Na+ ions were located at site I, the center of the hexagonal prism (Na-O = 2.842(5) angstrom and O-Na-O = 85.98(12)degrees). The 4 Na+ and 22 NH4+ ions were Pound at site I' in the sodalite cavity opposite the double 6-rings, respectively (Na-O = 2.53(13) angstrom, O-Na-O = 99.9(7)degrees, N-O = 2.762(11) angstrom, and O-N-O = 89.1(5)degrees). About 4 Na+ ions occupied site II (Na-O = 2.40(4) angstrom and O-Na-O = 108.9(3)degrees) and 29 NH4+ ions occupy site II (N-O = 2.824(9) angstrom and O-N-O = 87.3(3)degrees) opposite to the single 6-rings in the supercage. The remaining 9 NH4+ ions were distributed over site III' (N-O = 2.55(3), 2.725(13) angstrom and O-N-O = 94.1(13), 62.16(15), 155.7(14)degrees)
아지리딘 고리열림 반응의 특이한 자리선택성에 대한 이론적 연구
No full text학위논문(석사) - 한국과학기술원 : 화학과, 2006.2, [ vi, 48 p. ]Aziridines serve as versatile building blocks for organic synthetic chemistry and play a pivotal role in biologically relevant reactions. Thus, the regioselectivity in aziridine ring-opining reaction is highly important to get a target product. Aziridines usually prefer nucleophilic attack at the less-substituted carbon (C3) due to minimal steric hindrance. Occasionally, however, there are some exceptions where the more-substituted carbon (C2) undergoes nucleophilic attack. In this study, we examined the regioselectivity of aziridine ring-opening with quantum chemical DFT calculation methods including density functional theory [B3LYP/ 6-31+G(d)]. The energy profiles of aziridine ring-opening were obtained, the activation barriers were compared, and then the regioselectivity was determined. The analysis of reactant properties provided good explanation for regioselectivity. It was demonstrated that the unusual ring-opening occurs along the C2-N bond, activated by the concerted interaction between electron-donating aryl group and electron-withdrawing pyridine moiety.한국과학기술원 : 화학과
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