1,721,019 research outputs found
Quantifying the approach and retreat of objects from a solid interface using electrochemical techniques
No full textThis thesis investigates the approach and retreat of conducting and non-conducting micro-spheres to a solid interface. In some cases the interface was an electrode which was able to detect the approach and contact between the sphere and the interface. Three different electrodes, platinum, carbon fibre and gold, were used to explore the interaction between the spheres and the electrode. It was shown that once contact between the surfaces had been made, the conducting spheres produced a different electrode response compared to the insulating spheres.Several techniques were used to understand the nature of the interaction between the micro-spheres and the electrode surfaces. A bespoke impedance technique was employed which used a fixed frequency to obtain values for the capacitance and uncompensated resistace. This technique allowed for near real-time data capture and enabled the capacitance and uncompensated resistance of dynamic environments to be investigated. This technique was used, in conjunction with imaging, to investigate both conducting and non-conducting micro-spheres as they approached the electrode either under the effects of gravity or when held by a support. The experiments showed that the interaction between the sphere and the surface was complex. It also revealed the presence of paracitic vibrations within the building.Electrochemical impedance spectroscopy and cyclic voltammetry were employed to investigate stationary spheres at defined distances from the electrode. These measurements were instrumental in understanding the changes observed in the uncompensated resistance and capacitance recorded in a dynamic envrionment using the fixed-frequency technique.Simulations of the primary and secondary current distribution were performed based on the experimental set-up; COMSOL was used to implement the simulations. The simulations were able to separate the effect of the spheres and the effect of the support capillary to the uncompensated resistance and capacitance of the electrode. It was shown that the conducting spheres lowered the uncompensated resistance at the electrode interface and increased the observed capacitance, though in the physical experiments this was often masked by the support holding the sphere.Non-electroactive surfaces were also investigated using the fixed frequency technique; in these cases the surfaces used were glass, PTFE and stainless steel and the object was to determine the adhesion between the micro-sphere and the selected surface. In this case the sphere was lifted from a surface multiple times using a glass pore and a pressure rig. A two-electrode system whereby the electrodes were electronically separated by the glass pore was employed. When the sphere was held in the pore mouth the flow of current between the two electrodes was reduced, this reduction triggered the system to release the sphere and begin the measurement again. This enabled multiple autonomous measurements of the lift required to pull the sphere from the desired surface.<br/
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
Data in support of the Southampton doctoral thesis 'Quantifying the approach and retreat of objects from a solid interface using electrochemical technique'
No full textData used in the creation of figures in the thesis: Quantifying the approach and retreat of objects from a solid interface using electrochemical techniques.</span
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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