1,720,955 research outputs found
Saba Humayun, Discovering Swansea (Summer Shoot 2022)
No full textSaba Humayun is an award-winning activist and photographer. She is currently in receipt of a Refugee bursary, studying Photography in Swansea School of Art, University of Wales: Trinity Saint David.
This video showcases her summer shoots exploring and discovering Swansea 2022.</p
Covid Chronicles: Saba Humayun, Discovering Swansea (Summer Shoot 2022)
No full textSaba Humayun is an award-winning activist and photographer. She is currently in receipt of a Refugee bursary, studying Photography in Swansea School of Art, University of Wales: Trinity Saint David.
This video showcases her summer shoots exploring and discovering Swansea 2022.
This material is part of the Covid Chronicles from the Margins project, funded by The Open University and the International Institute of Social Studies in the Hague. The project aims to highlight the impact of the pandemic on refugees, asylum seekers and undocumented migrants. </p
Degradation of solid pharmaceutical waste using superoxide radical ion generated in ionic liquid/aprotic solvent mixture systems / Saba Humayun
No full textEnvironmental contamination by pharmaceuticals is on the rise, ensuing levels which are imminent globally. While the alleged harmful effects of drug waste are being rapidly substantiated at present, the development of effective and ‘greener’ techniques to degrade pharmaceuticals is a new challenge. This study explores a method using superoxide ion (O2●−) as the reactive oxygen species (ROS) for the degradation of APIs. Owing to the simplicity of its chemical structure and extensive research on the degradation of acetaminophen via various ROS, it was chosen for investigation as a model drug pollutant to thoroughly explore the advanced oxidation method. With an aim to further explore the universality of the oxidation process under investigation, the degradation of some other representative drug compounds was also examined; carbamazepine (CBM) and riluzole (RLZ) were additionally selected as target contaminants. The applicability of this oxidative degradation method on various pharmaceutical substances was validated using binary mixture systems consisting of butyltriethylammonium [BTEAmm+], triethylpentylammonium [PTEAmm+] and octyltriethylammonium [OTEAmm+] cations with bis(trifluoromethylsulfonyl)imide [TFSI−] anion-based hydrophobic ionic liquids (ILs) and acetonitrile (AcN) as an aprotic solvent (ApS). The ILs and AcN were used in varied combinations to generate O2 ●− for subsequent in-situ degradation of APIs. The O2 ●− was chemically generated by the dissolution of potassium superoxide (KO2) in [BTEAmm+][TFSI−]/AcN, [PTEAmm+][TFSI−]/AcN, [OTEAmm+] [TFSI−]/AcN and [EMIm+][TFSI−]/AcN systems to achieve complete degradation of the drugs. The novelty ofthis work lies in the demonstration of using IL/ApS binary mixtures which allow API removal of up to 98.9% within 210 mins of reaction. The extent of degradation of APIs was analyzed via the HPLC (high-performance liquid chromatography) technique by investigating the influence of different parameters and operating conditions, such as the amount of oxidant, nature of cations in ILs, length of cationic alkyl chain, ratio of IL:can (constituency of binary mixture), reaction time and reaction temperature. The most efficient degradation of ACTM was observed to occur utilizing 10% [OTEAmm+]/AcN as the reaction medium with a KO2/ACTM molar ratio of 50 at RT. A characteristic peak at the wavelength of 258 nm in UV-visible spectrophotometry was indicative of the stable generation of O2 ●− species, which confirms its presence in certain reaction media used. Cyclic voltammetry (CV) was used in order to further validate O2 ●− as a major reactive oxygen species generated in selected aprotic media, as evidently indicated by the oxygen reduction peak in the cyclic voltammograms. The ILs were recycled and found to be reusable for up to five replica cycles without significant changes in the degradation efficiencies, depicting the high efficacy of the environmentally benign regenerated media. Moreover, the evaluation of TOC decay determined that complete mineralization of APIs was achieved under optimum conditions. Degradation mechanism pathways for the pharmaceutical compounds were proposed based on LCMS analysis for the identification of intermediate transformation products resulting from drug oxidation. This work will serve to instigate further progression in the direct use of O2 ●− as a suitable alternative approach for environmental remediation pertaining to pharmaceutical contaminants
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
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