1,720,972 research outputs found
The electrolyte layer composition: A key element for improving the performance of carbon nanotube actuator
No full textBucky gel actuators are typically fabricated by having an electrolyte layer sandwiched by two carbon nanotubes electrodes. They possess outstanding electrical and mechanical properties thanks to their composition, which make them very attractive for robotics applications. Even though carbon nanotube electrodes have been extensively studied in the recent years, the electrolyte layer has not been investigated in depth yet. In this study, we demonstrate that the performances (strain and blocking force) of carbon nanotubes actuators can be improved by tuning the electrolyte layer composition. The viscosity and the ionic conductivity of various binary solvent–ionic liquid mixtures (ethylene glycol, polyethylene glycol, acetonitrile, propylene carbonate, 4-methyl-2-pentanone as solvents and 1-butyl-3-methylimidazolium tetrafluoroborate as the ionic liquid) were first examined and used as key parameters to select the optimal electrolyte layer composition. We observed a remarkable increase of strain and blocking force when the ionic conductivity and the viscosity of the electrolyte were maximum and minimum respectively
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
Poly(ionic liquid)-carbon nanotubes self-supported, highly electroconductive composites and their application in electroactive devices
No full textA series of novel poly(ionic liquid)s/carbon nanotubes composites were prepared and studied. The effect of the anion on the thermal, mechanical and electrical properties of the composites was investigated. We obtained electrical conductivities ranged from 20 to 40 S cm−1 which are amongst the highest reported for a material involving poly(ionic liquid)s and carbon nanotubes only. Dry electrochemical actuators were successfully prepared using poly(ionic liquid)s composites as electrodes, without the use of a polymer support such as polyvinylidene difluoride. It was found that the anion size influences the displacement response of the actuator. A maximum bending displacement of up to 0.5 mm was recorded under a low applied voltage of ±1 V
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
Significant strain and force improvements of single-walled carbon nanotube actuator: A metal chalcogenides approach
No full textCarbon nanotube actuators possess the requirements to be used in soft robotic applications as they are lightweight, simple to assemble and can operate at low voltage. However, there is still a need to further enhance their performances - in particular strain and blocking force - in order to render their implementation in devices more viable. In this study, we report the electrochemical and electromechanical properties of carbon nanotube-polymer actuators containing metal chalcogenides (BN, WS2 and MoS2). We demonstrate that the incorporation of such particles in the carbon-based electrodes results in a remarkable increase of the actuators' performances. Indeed, by tuning the amount of metal chalcogenides, we improve both the strain and blocking force responses of the actuators by 60%
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