1,721,128 research outputs found
Monolayer NiIr-Layered Double Hydroxide as a Long-Lived Efficient Oxygen Evolution Catalyst for Seawater Splitting
No full textPromoting
the oxygen evolution reaction (OER) with saline water
is highly desired to realize seawater splitting. This requires OER
catalysts to resist serious corrosion and undesirable chloride oxidation.
We introduce a 5d transition metal, Ir, to develop a monolayer NiIr-layered
double hydroxide (NiIr-LDH) as the catalyst with enhanced OER performance
for seawater splitting. The NiIr-LDH catalyst delivers 500 mA/cm2 at only 361 mV overpotential with ∼99% O2 Faradaic efficiency in alkaline seawater, which is more active than
commercial IrO2 (763 mV, 23%) and the best known OER catalyst
NiFe-LDH (530 mV, 92%). Moreover, it shows negligible activity loss
at up to 650 h chronopotentiometry measurements at an industrial level
(500 mA/cm2), while commercial IrO2 and NiFe-LDH
rapidly deactivated within 0.2 and 10 h, respectively. The incorporation
of Ir into the Ni(OH)2 layer greatly altered the electron
density of Ir and Ni sites, which was revealed by X-ray absorption
fine structure and density functional theory (DFT) calculations. Coupling
the electrochemical measurements and in situ Raman spectrum with DFT
calculations, we further confirm that the generation of rate-limiting
intermediate *O and *OOH species was accelerated on Ni and Ir sites,
respectively, which is responsible for the high seawater splitting
performance. Our results also provide an opportunity to fabricate
LDH materials containing 5d metals for applications beyond seawater
splitting
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
Ultrathin NiIr-layered double hydroxides accelerate oxygen evolution reaction in seawater
No full textThe development of highly efficient and stable anode catalysts is one of the great challenges for seawater splitting. In the June issue of Journal of the American Chemical Society, Cao’s group reported novel NiIr-layered double hydroxides as efficient and stable anode catalysts at industrial current for seawater splitting.This work received financial support from the King Abdullah University of Science and Technology (KAUST). H.H. appreciates the support from the KAUST Global Fellowship Program
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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