1,721,097 research outputs found
Crystal engineering studies of metal 1,1�-dithiolates: coordination polymers and beyond / Tan Yee Seng
Get PDFCrystal engineering was implemented by conducting three distinctive projects, covering a total of 22 compounds. These compounds were fully characterised via various spectroscopic techniques and materials analysis, including FT-IR, UV-Vis, PL, SCXRD, PXRD, NMR, TGA, DSC and CHN elemental analysis. Crystallographic study of all compounds forms the core focus of current research for delineation of crystal engineering. The first project assessed seven crystal structures of same metal centre and ligand, with two forming one-dimensional coordination polymers. The factors leading to formation of solvomorph and supramolecular isomers were investigated. Solvomorph were obtained from different crystallisation parameters and solvent systems, while unanticipated non-reversible single crystal to single crystal transformations were found to afford two pairs of supramolecular isomers (1 to 2 and 6 to 7), stimulated by stabilisation energy in crystal systems and atmospheric moisture. The above �non-reversible transformations� were, however interconverted by developing a solvent-induced reversible transformation system. Hexamethylenetetramine, a multidentate linker, was employed in the second project, which revealed its adoption of multiple coordination modes through the complexation with different cadmium xanthates. Unexpectedly, the coordination mode of hexamethylenetetramine was not affected despite varying the mole ratio of linker and precursor, i.e. 1:1, 1:2, and 2:1, identical adducts were obtained in respective synthesis. Hexamethylenetetramine functioned as ?2 and ?3 to form one-dimensional coordination polymers in compound 8 and 9, and ?1 in the dimeric motif of compound 10. The coordination modes of hexamethylenetetramine depend upon the orientation of cadmium xanthate in the molecule, as demonstrated by compounds 8 and 9. The highly packing crystal system of compound 8 oriented the methyl group of xanthate which prevented the coordination of third nitrogen atom of hexamethylenetetramine; while the steric effect
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induced by the ethyl group resulted in a position which allowed the third coordination of hexamethylenetetramine in compound 9. The third project aims to introduce the C�H????(PdS2C) interactions in palladium xanthate. Palladium xanthate 11 � 22, a total of 12 compounds were prepared and the C�H????(PdS2C) interactions were successfully implemented in 11 out of 12 compounds, with some structures displayed up to a maximum of six interactions per molecule. Compound 13 was subjected to density functional theory calculations; the C�H????(PdS2C) was verified as second important interactions to support the respective crystal system, followed after Pd???S interactions. In addition to the above, the crystal system was also stabilised by hydrophobic interactions of side-by-side aliphatic chains
Data for: Functional domains of NEAT1 architectural lncRNA induce paraspeckle assembly through phase separation (Yamazaki et al.)
No full textOriginal reference: Tomohiro Yamazaki, Sylvie Souquere, Takeshi Chujo, Simon Kobelke, Yee Seng Chong, Archa H. Fox, Charles S. Bond, Shinichi Nakagawa, Gerard Pierron, Tetsuro Hirose, Functional Domains of NEAT1 Architectural lncRNA Induce Paraspeckle Assembly through Phase Separation, Molecular cell, Volume 70, Issue 6, pp.1038-1053, 2018Mendeley Data, v
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
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
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
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