1,720,987 research outputs found
Dataset in support of the publication 'Localised Thermal Levering Events Drive Spontaneous Kinetic Oscillations during CO oxidation on Rh/Al2O3 '
No full textDataset supporting the publication 'Localised Thermal Levering Events Drive Spontaneous Kinetic Oscillations during CO oxidation on Rh/Al2O3 ' (2024) Nature Catalysis.
Data is presented in .opju, .xlsx and .docx files.
The data was collected at Research Complex At Harwell, U.K & Diamond Light Source, UK.
Dataset available under a CC-BY licence</span
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
Effect of precious metal particle size and support type on catalytic activity as revealed by X-ray methods
Full text linkFor supported nanoparticulate catalysts, the effect of their properties, such as size and interaction with support, on a catalytic process is still in debate. This is partially caused by the limited control that typical nanoparticle preparation methods offer which may lead to the presence of nanoparticles possessing a range of sizes and shapes, leading to a lack of clarity in the correlation between properties and catalysis. The work presented in this thesis focuses on producing size-selected monometallic supported nanoparticles and their detailed characterisation, both ex situ and in situ (under reaction conditions) mainly through the application of the technique of X-ray absorption spectroscopy (XAFS). Chapter 3 of this thesis focuses on understanding the mechanism of formation of Au nanoparticles produced by reverse micelle encapsulation, through a combination of various techniques (transmission electron microscopy, dynamic light scattering, UV-vis, combined small angle X-ray scattering/XAFS). From the combined data, it is possible to rationalise the synthesis process, which can be divided into three steps: fast reduction of Au (III) species to Au (I), slow reduction and agglomeration of Au atoms in sub-nanometric clusters and a final agglomeration to form the nanoparticles. Chapter 4 and 5 focus on the application of monometallic nanoparticles to the catalytic hydrogenation of 1,3-butadiene, used as a model reaction, using in situ XAFS to correlate size and support effect with their catalytic activities. For Au nanoparticles (chapter 4) it appears that a restructuring process takes places under reaction conditions. Depending on the sample, this process can be favourable (Au/SiO2) or detrimental (Au/Al2O3) and is highly dependent on particle size. For Pd nanoparticles (chapter 5) it was possible to identify the active species necessary (Pd0), and detrimental (PdH and PdC) for the selective hydrogenation of 1,3-butadiene in Pd as well as the role of support and size in promoting the presence of each phase
Al-doped Fe<sub>2</sub>O<sub>3</sub>as a support for molybdenum oxide methanol oxidation catalysts
Full text linkWe have made high surface area catalysts for the selective oxidation of methanol to formaldehyde. This is done in two ways-(i) by doping haematite with Al ions, to increase the surface area of the material, but which itself is unselective and (ii) by surface coating with Mo which induces high selectivity. Temperature programmed desorption (TPD) of methanol shows little difference in surface chemistry of the doped haematite from the undoped material, with the main products being CO2 and CO, but shifted to somewhat higher desorption temperature. However, when Mo is dosed onto the haematite surface, the chemistry changes completely to show mainly the selective product, formaldehyde, with no CO2 production, and this is little changed up to 10% Al loading. But at 15 wt% Al, the chemistry changes to indicate the presence of a strongly acidic function at the surface, with additional dimethyl ether and CO/CO2 production characteristic of the presence of alumina. Structurally, X-ray diffraction (XRD) shows little change over the range 0-20% Al doping, except for some small lattice contraction, while the surface area increases from around 20 to 100 m2 g-1. Using X-ray absorption spectroscopy (XAS) it is clear that, at 5% loading, the Al is incorporated into the Fe2O3 corundum lattice, which has the same structure as α-alumina. By 10% loading then it appears that the alumina starts to nano-crystallise within the haematite lattice into the γ form. At higher loadings, there is evidence of phase separation into separate Al-doped haematite and γ-alumina. If we add 1 monolayer equivalent of Mo to the surface there is already high selectivity to formaldehyde, but little change in structure, because that monolayer is isolated at the surface. However, when three monolayers equivalent of Mo is added, we then see aluminium molybdate type signatures in the XANES spectra at 5% Al loading and above. These appear to be in a sub-surface layer with Fe molybdate, which we interpret as due to Al substitution into ferric molybdate layers immediately beneath the topmost surface layer of molybdena. It seems like the separate γ-alumina phase is not covered by molybdena and is responsible for the appearance of the acid function products in the TPD. </p
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
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