1,720,987 research outputs found
Analysis of a gas supply unit based on hydrogen peroxide decomposition for wearable robotic applications
No full textWith the aim of developing new solutions for powering pneumatic actuators in the field of wearable robotics, a principle scheme of a pressurized gas supply unit (GSU) based on hydrogen peroxide decomposition is proposed and a dynamic mathematical model is developed to simulate its operation. In the application scenario considered for the simulations, the GSU feeds a pneumatic ankle prosthesis during a standard daily living at-home activity. Furthermore, experiments of hydrogen peroxide decomposition on manganese dioxide powder have been carried out in an apparatus that partially mimics the behavior of the GSU. The results show that the GSU proposed is suitable for the implementation in a mobile robotic system, and, more in general, the use of the hydrogen peroxide decomposition process as a gas source for pneumatic actuators can be a viable approach to solve the principal issues related to powering wearable robotic devices. © 2013 American Chemical Society
Adsorption of albumin-bound toxins on anion exchange resin: An equilibrium study
No full textBilirubin and tryptophan are among the albumin-bound toxins that must be removed from blood during liver-failure therapy. Artificial liver support devices currently used in clinical practice remove these types of toxins by means of different processes, that are mainly based on adsorption. In this paper, bilirubin and tryptophan adsorption isotherms on anion exchange resin with different albumin concentrations are presented. The results show that the adsorbed amount of toxin decreases with increasing albumin concentration in the solution. This behaviour has been analyzed by means of an original semi-empirical adsorption model that takes in to account the effect of albumin on toxins adsorption equilibrium. The model highlights that this phenomenon is principally because of the competitive binding of toxin between albumin and sorbent, but, in the case of bilirubin, the reduction in the adsorbed amount of toxin was higher than what can be predicted by considering only this phenomenon. From a different point of view, the experimental results show that the anion exchange resin tested is a suitable sorbent for bilirubin removal, while its adsorption capacity for tryptophan is very low and, therefore, different sorptive media should be considered to remove this compound. Copyright © 2011 Curtin University of Technology and John Wiley & Sons, Ltd
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
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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