1,721,002 research outputs found
On the Nature of Microlayer Formation with Ethanol-Water Mixtures: Data and MATLAB Codes
No full textThis repository provides the dataset of all the figures of the results section in the research article: Sinha, Kumar Nishant Ranjan and Schweikert, Kai and Sielaff, Axel and Stephan, Peter, On the Nature of Microlayer Formation with Ethanol-Water Mixtures
Numerical simulations on the effect of an electric field on vapor bubble growth in microgravity
No full textabstrac
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
Experimental Investigation of Single Bubbles and Bubble Interactions in Nucleate Boiling
No full textBoiling processes are widely used in technical applications. The chemical industry, power plant technology, and refrigeration engineering are just a few examples. Intensive research on pool boiling processes has been undertaken for decades. Nevertheless, the physical phenomena are still not sufficiently understood. This is mainly caused by the large number of influencing factors and the wide range of length and time scales boiling processes act on.
Especially through the research on small length scales a better understanding of the underlying physical phenomena should be achieved. The subject of the present thesis is the experimental investigation of boiling processes with single bubbles and bubble interactions. In a further step, the reliability of the results obtained for a few interacting bubbles is tested on a technical
length scale.
Within the framework of this thesis an experimental setup is designed and fabricated. By use of optical measurement methods (black/white and infrared) the shape of the bubbles and the temperature close to the heater surface are measured simultaneously. Within the experimental setup and method emphasis is put on the validity of the obtained data (especially the infrared measurements). The test setup is based on a thin stainless steel foil used as a Joule heater. The working fluid is FC-72. Almost all experiments are performed at subatmospheric pressure.
In this thesis general results for boiling experiments with single bubbles, for example concerning the departure diameter and frequency, are presented. It is observed that for single bubbles a thin liquid layer can remain underneath a bubble after nucleation. By comparing bubble growth with and without this layer a first statement of the validity of the contact line and microlayer model is achieved. Experiments with bubbles coalescing show a clear dependency of the coalescence frequency on the system pressure, partly following a probability distribution. In comparison of a case with and without bubble coalescence an increased heat transfer is found for the coalescence case. This effect is mainly caused by hydrodynamic phenomena and sometimes also by the formation of residual droplets inside large bubbles. It is shown that the effects observed for the coalescence of two bubbles is not transferable to global boiling processes. With the help of a Monte-Carlo simulation these phenomena can be explained by different coalescence behavior. The experimental
results furthermore give a possible explanation for the deviations between experimental and analytic bubble departure diameters due to the dynamic effects during bubble nucleation
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