1,720,960 research outputs found
Versatile, transferrable 3-dimensionally nanofabricated Au catalysts with high-index crystal planes for highly efficient and robust electrochemical CO2 reduction
No full textConsiderable interest has been shown in the electrochemical CO2 reduction reaction (CO2RR) for transforming CO2 into other value-added carbonaceous products such as CO. In this work, we prepared multi-stacked Au (MS-Au) nanowire arrays with tailored active reaction sites and controlled 3-dimensional structures by oblique angle deposition and a sequential solvent-assisted nanotransfer printing (S-nTP) method for highly selective and efficient electrochemical CO2RR. Our MS-Au nanowires exhibit high CO2RR activity in a wide range of overpotentials due to the electrochemically active high index grain faces and high grain boundary density and by controlling local reaction environments. With our 10 layers of MS-Au nanowires, we achieve similar to 13 times higher CO2RR geometric current density (j(CO)) at low overpotential (-0.39 V) compared to the pristine Au thin-film electrode. Finally, the S-nTP method allows versatile transferability of MS-Au nanowires onto a gas diffusion electrode in a flow reactor to maximize CO evolution with an exceptional mass activity of similar to 172.66 A g(-1) at an overpotential of only 80 mV.
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
이산화탄소 환원 반응을 위한 전기화학적 가스 확산 시스템
No full text학위논문(석사) - 한국과학기술원 : 신소재공학과, 2019.8,[iv, 32 p. :]According to Intergovernmental Panel on Climate Change (IPCC), carbon dioxide is considered the main reason for global warming. As global warming problems become deteriorated, electrochemical carbon dioxide reduction reaction () has received attention that is promising route for storing intermittent renewable electrical energy in the form of valuable carbon-based fuels and chemicals while reducing the in the atmosphere. Catalysts is essential for due to stable characteristics of molecules. The products of depends on the kind of catalysts. Gold and silver is the representative catalysts for producing CO and copper is the representative catalysts that can produce methane, methanol, ethylene and ethanol and so on. Many researchers have used liquid phase electrolyzer that is dissolved gas in electrolyte, however, the current density of is limited by the transport limit of reactant because the solubility of gas in aqueous solution is very low (33 mM at 25 , 1 atm).
In this thesis, we constructed a gas phase electrolyzer that is not affected by the solubility of gas in aqueous solution. We verified that the gas phase electrolyzer shows better performance compared to liquid phase electrolyzer using commercial silver powder. Moreover, we achieved over than 300 mA/ of CO partial current density with higher than 90 % CO selectivity by employing Au25 clusters to the gas phase electrolyzer. Then, we established solar-powered gas phase electrolyzer using Au25 clusters and heterogeneous with intrinsic thin layer (HIT) cells. We achieved 7.61 % of solar to CO conversion efficiency through the solar-powered gas phase electrolyzer. At last, we tested our solar-powered gas phase electrolyzer at dilute streams and recognized that 40 % of in gas streams shows similar solar to CO conversion efficiency with concentrated CO2 streams.한국과학기술원 :신소재공학과
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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