1,720,964 research outputs found
Synthesis and characterization of conducting copolymer nanofibrils of pyrrole and 3-methylthiophene using the template-synthesis method
No full textCopolymer nanofibrils composed of pyrrole and 3-methylthiophene had been prepared by synthesizing the desired polymer within the pores of microporous anodic aluminum oxide (AAO) template membrane. The results of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that the obtained copolymer nanofibrils had uniform and well-aligned array and its diameter and length can be controlled by changing the aspect ratios of the AAO membrane. The results of infrared (IR) spectra, X-ray photoelectron spectroscopy (XPS) and elemental analysis indicated that both pyrrole and 3-methylthiophene were involved in the copolymer and pyrrle is the major component of the prepared copolymer nanofibrils. Finally, the uses of conductivity and thermogravimetric analysis (TGA) proved that the electric conductivity and the thermal stability of copolymer nanofibrils are higher than individual homopolymers
Electrodeposition of mesoporous manganese dioxide supercapacitor electrodes through self-assembled triblock copolymer templates
No full textMesoporous manganese dioxide supercapcitor electrode materials were electrochemically deposited onto silicon substrates coated with Pt using
triblock copolymer species (Pluronic P123 and F127) as the structure-directing agents. Deposited electrodes of manganese dioxide film were
physically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and
were electrochemically characterized by cyclic voltammetry (CV) in 0.5M Na2SO4 electrolyte. Maximum specific capacitance (SC) values of
449Fg?1 was obtained at a scan rate of 10mVs?1 from F127 templated mesoporous MnO2
Well-dispersed single-walled carbon nanotube/polyaniline composite films
No full textSingle-walled carbon nanotube (SWNT) / polyaniline (PANI) composite films with good uniformity and dispersion were
prepared by electrochemical polymerization of aniline containing well-dissolved SWNTs. The results of atomic force
microscopy (AFM) and UV–Vis adsorption spectroscopy show that aniline can be used to solubilize SWNTs via formation
of donor–acceptor complexes. The electrochemical deposition of SWNT–aniline solutions have been investigated by cyclic
voltammetry. The results show that SWNT-based aniline solutions exhibit a drastic increase in peak current within the
potential scanning region. The doping effect of SWNTs on PANI films was investigated by electrochemistry and FTIR
spectroscopy. The results indicate that the enhanced electroactivity and conductivity of the SWNT/PANI composite films
may be due to the strong interaction between SWNTs and PANI, which facilitates the effective degree of electron
delocalization
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
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