1,720,964 research outputs found
Electrochemical properties of Gd@C-82 and its anions
No full textCyclic voltammogram (CV) and differential pulse voltammogram (DPV) of Gd@C-82 were measured by using mixed solvent system and low temperature. The sixth and seventh electron transfers for Gd@C-82 were observed under this condition. Analysis of its electrochemical data and the changes of its UV-VIS-NIR spectrum indicated that Gd@C-82(n-) (n = 1, 3) anions had been generated by chemical method. (C) 2002 Elsevier Science B.V. All rights reserved.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000176729100009&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701ElectrochemistrySCI(E)11ARTICLE147-49
Purification of single-wall carbon nanotubes
No full textWith Y-Ni alloy and CaC2-Ni as catalyst, large-scale single-wall carbon nanotubes (SWCNTs) were produced by d.c. arc-discharge method. The yield of SWCNTs and the composition of the raw-soot was quantified with thermogravimetric analysis (TGA). The burning temperature of SWCNTs in air was also determined. On these bases, 350 degrees C was chosen for the first step purification of SWCNTs. Combining with the micro-filtration method, larger than 90% purity of SWCNTs and high purity of carbon nanoparticles were obtained. (C) 1999 Elsevier Science Ltd. All rights reserved.Physics, Condensed MatterSCI(E)EI198ARTICLE135-3711
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
Zirconium cage-doped fullerenes
No full textSome zirconium containing fullerenes were synthesized by vaporizing a zirconium-containing graphite anode with DC are discharge technique, extracted by CS2 through Low temperature extraction method, and characterized by field desorption mass spectra (FDMS). The results show that these doped fullerenes were zirconium cage-doped fullerenes.Chemistry, PhysicalMaterials Science, MultidisciplinaryPhysics, Atomic, Molecular & ChemicalSCI(E)EI1ARTICLE6483-489
X-ray luminescence properties of rare-earth doped orthotantalate
No full textThis paper reports the X-ray luminescence emission spectra of YTaO4 and GdTaO4 activated by rare-earth ions. The luminescence efficiency of M'-type YTaO4 activated by rare-earth ions was calculated. An assumption model was used to explain the luminescent properties under X-ray excitation. The model assumes that the TaO43- group absorbs all the excitation energy, then transfers part of the energy to rare-earth ions, followed by emission of rare-earth ions. The calculation results agree with experimental results for M'-type YTaO4 activated by Sm3+, Tb3+, and Dy3+. M'-type YTaO4:Eu3+ is an exception because EU3+ may be involved in the process of energy absorption. (C) 2001 Elsevier Science Ltd. All rights reserved.Materials Science, MultidisciplinarySCI(E)EI33ARTICLE121921-19313
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
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