1,720,971 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
Improving the Performance of Halide Perovskite Thin Film through Pb(II) Coordination Chemistry
Full text linkVariations 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
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
Multi-point Hydrogen-Bonded Organic Cocrystals for Optoelectronic Materials: Design, Synthesis and Characterization
No full textThe enormous global demands for low-cost, ease-of-use, light-weighted and flexible organic semiconductors have continued to drive the research. Organic cocrystal engineering, one of the methodologies to design new organic materials with unconventional functionality, has attracted great attention globally. Organic cocrystal engineering, taking advantage of organic synthesis, the self-assembly of molecules, and the great chemical versatility of organic compounds, offers an excellent option to tap the full potential of organic and organo-metallic compounds to address diverse demands and challenges.
Cocrystal series, DBA-M(L), including DBA-3, Ni(L1)2·4DBA, and PdLN2C8-DBA etc., and M(L)-NDIs, including Ni(L1)2-NDIC8H, Pd(L1)2-NDIC8H, and Zn(L1)2-NDIC8H, were designed, synthesized and characterized by using SCXRD, NMR, IR, UV-vis, TGA, and XPS techniques. The cocrystal complexes, built by components DBA, M(L) and NDI and their derivatives, were designed, synthesized and characterized using NMR, XRD, IR, UV-vis, TGA, and XPS techniques. The materials were applied in OFETs, and the electronic properties were studied. Most cocrystals showed improved electronic properties, compared to the corresponding single components. The crystal packings, structure-property relationships, and self-assembling process were discussed, supported by the combination of single crystal structure study, crystal structure stimulation and the calculations of the electronic structures.
This work involves the theories of inorganic chemistry, crystallography, organic semiconductors, optoelectronic devices, and supramolecular chemistry. Chapter 1 introduced the concepts and the theories of organic semiconductors, supramolecular chemistry and crystal engineering and their applications, as well as the structure and applications of optoelectronic devices, including OFET, SCFET and TFT. Chapter 2 covers the experimental part of my research. In Chapter 3, the polymorphism of DBA was studied, which covered the study of crystal structure and the electronic property of three polymorphs of DBA, i.e. DBA, DBA·3H2O and DBA·3.5H2O. The asymmetric mobilities of the single crystals were observed for DBA-3. In the structure, the closest distance of the π-π stacking was found to be 3.309 Å, which falls in the range of suitable distances for charge transfer and the mobility of DBA·3H2O was found to be 0.032 cm2 V-1 s-1. The variation of the hydrogen bonding structures in the three polymorphs contributes to the different ways of packing DBA molecules in the crystals or the polymorphism.
In Chapter 4, a series of guanines and biguanides, their complexes with transition metals M-L, M = Co(II), Ni(II), Cu(II), Zn(II) and Pd(II) were designed, synthesized and characterized using SCXRD, NMR, IR, UV-vis, TGA, and XPS techniques. Ni(L1)2·4DBA was first designed and synthesized as a tetra hydrogen bonded model. Pd(LN2C8)-DBA was then developed to improve the solubility and film-forming properties of the model. With LN2C8 as the ligand, where a substitute group is an n-octyl group, the materials showed high flexibility. And, flexible OFET devices were thus achieved using M(LN2C8) complexes and their cocrystals. Meanwhile, the cocrystals showed more stable electronic properties than the single metal-ligand complexes, and better performance in TFT was observed, compared to the corresponding single components.
In Chapter 5, cocrystal Ni(L1)2-NDIC8H was designed, synthesized and characterized. The asymmetric NDI derivative, NDIC8H, was successfully synthesized from NDA, with good yield, and its cocrystal with Ni(L1)2 was obtained. The asymmetric NDIC8H was applied, and enhanced optic and electronic properties were achieved. The findings from this research could contribute to the design of new optoelectronic functional materials
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