1,720,962 research outputs found
A spider-web-like highly expandable sensor network for multifunctional materials
No full textA multiscale method that allows a noninvasive and precise integration of thousands of nano- or microscale electronic devices into large macroscopic materials or structures of any 3D shape and rigidity is demonstrated. An array of microsensors (for strain and temperature) is built on a spider-web-like, highly expandable and flexible polyimide substrate that is engineered in such a way as to allow unique area dilatations. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Data-Driven Modeling of Wetting Angle and Corrosion Resistance of Hypereutectic Cast Aluminum-Silicon Alloys Based on Physical and Chemical Properties of Surface
No full textIn the present study, a data-driven approach was applied to study the effect of silicon percentage, surface roughness, elapsed time, and water droplet size on contact angle (CA) of hypereutectic cast Al-Si alloys. In addition, corrosion resistance of the alloys was studied as a function of silicon content and the surface roughness. A factorial design was utilized for the design of experiment, and statistical analysis, including General Linear Model (GLM) and Polynomial Regression, were performed for the interpretation of the CA values. Wenzel and Cassie-Baxter contact angles were also calculated and compared with the corresponding measured contact angles to study which regime was followed. The statistical analysis results show that surface roughness, droplet size, and elapsed time are significant factors in the variation of contact angle. In addition, CA was observed to increase with surface roughness, droplet size, and elapsed time. It was observed that the experimental CA values follow a quasi Cassie-Baxter regime in which CA increases by increasing surface roughness. Si % turned out to be a statistically non-significant factor. It is possibly due to a trade-off between the increase in CA as a result of a change in surface chemistry and decrease in CA because of the smoother surface of Si compared to the eutectic phase in a given surface finish
Functionalization of stretchable networks with sensors and switches for composite materials
No full textAn investigation was performed to develop appropriate techniques to design and fabricate (using complementary metal-oxide semiconductor/micro-electro-mechanical systems technologies) highly stretchable networks of distributed sensors and organic diodes that could be stretched, and surface-mounted or embedded into polymeric materials to cover an area several orders of magnitude larger than its original size. Both analysis and experiments were performed to validate the design and fabrication methods. The techniques sought to reduce stresses due to network expansion, and a new spin-coated fabrication process was developed to enable high-resolution features in the network. Networks with temperature sensors and piezoelectric sensors were fabricated and tested to demonstrate functionality in advanced composite materials that are common in aircraft
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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