1,721,426 research outputs found
Files for "Sensitivity of Simulated Fire-Generated Circulations to Fuel Load During Large Wildfires"
No full textWRF-Fire model output files, estimated fire perimeter data, NEXRAD radar data, and post-processing scripts for analysis and visualizations
High-throughput fabrication and testing of lithium battery materials
No full textEThOS - Electronic Theses Online ServiceGBUnited Kingdo
Dip–spin coating of reticulated vitreous carbon with composite materials to act as an electrode for 3D microstructured lithium ion batteries
No full textThis paper describes a new and economic route for the formation of three dimensional (3D) microstructured battery electrodes using our “in house” developed dip–spin coating technique for depositing layers of active material onto reticulated vitreous carbon (RVC) substrates. These coatings are optimized composite materials containing carbon black and polymer binder to facilitate good electronic and ionic conductivities through the electrode. The application process begins by immersing the substrate in an ink followed by rapid spinning to provide a uniform coating with a well controlled mass loading. The performance of the electrodes was investigated in lithium ion cells as a function of the composition of the inks used and the number of dip–spin coating cycles.Optimization of the ink composition, dip and spin parameters has improved the electrochemical performances of the electrodes to give state of the art footprint area specific capacities (>1000 ?A h cm?2) and high rate capabilities (nearly 50% degree of discharge at 25 C) in lithium half cells. This represents the first stage in the development of a full 3D microbattery system. Initial results have also shown the versatility of this approach in depositing other electrode materials by forming uniform layers of both TiO2 and LiMn2O
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
High-throughput studies of Li1-xMgx/2FePO4 and LiFe1-yMgyPO4 and the effect of carbon coating
No full textA two-dimensional sample array synthesis has been used to screen carbon-coated Li(1?x)Mgx/2FePO4 and LiFe(1?y)MgyPO4 powders as potential positive electrode materials in lithium ion batteries with respect to x, y and carbon content. The synthesis route, using sucrose as a carbon source as well as a viscosity-enhancing additive, allowed introduction of the Mg dopant from solution into the sol–gel pyrolysis precursor. High-throughput XRD and cyclic voltammetry confirmed the formation of the olivine phase and percolation of the electronic conduction path at sucrose to phosphate ratios between 0.15 and 0.20. Measurements of the charge passed per discharge cycle showed that the capacity deteriorated on increasing magnesium in Li(1?x)Mgx/2FePO4, but improved with increasing magnesium in LiFe(1?y) MgyPO4, especially at high scan rates. Rietveld-refined XRD results on samples of LiFe(1?y)MgyPO4 prepared by a solid-state route showed a single phase up to y = 0.1 according to progressive increases in unit cell volume with increases in y. Carbon-free samples of the same materials showed conductivity increases from 10?10 to 10?8 S cm?1 and a decrease of activation energy from 0.62 to 0.51 eV. Galvanostatic cycling showed near theoretical capacity for y = 0.1 compared with only 80% capacity for undoped material under the same conditions.<br/
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
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