1,721,013 research outputs found
Highly basic ceria-doped carbon nanofibers for H2 production via catalytic NH3 decomposition
No full text8 figures, 3 tables.This study explores the effect of CeO2 doping on the catalytic performance of Fe, Co, and Ni catalysts supported on carbon nanofibers (CNFs) for hydrogen production via ammonia decomposition. Incorporating CeO2 significantly enhanced catalytic activity, achieving 90 % ammonia conversion at 600 °C. Stability tests confirmed sustained performance, maintaining high activity for at least 30 h on stream. A deep surface characterization revealed that the incorporation of Ni after the CeO2 doping created nanocatalytic portions of highly dispersed Ni/CeO2 on the CNFs structure. This guaranteed an intimate contact between the Ni and the CeO2, resulting in an increase in the H2 production rate. Notably, Ni catalysts directly supported on bulk CeO2 exhibited inferior performance, likely due to low relative surface of available ceria. These findings highlight CeO2-doped CNFs as a promising platform for scalable, high-performance hydrogen production from ammonia.Authors acknowledge the Government of Aragon for the grant awarded to the Fuel Conversion Group (T06_23R). C.D.S is grateful for the Juan de la Cierva (JdC) fellowship (Grant Number: JDC2022-048765-I) funded by MICIU/AEI /10.13039/501100011033 and by the European Union NextGenerationEU/PRTR. Jaime López-De Los Ríos acknowledges Diputación General de Aragón (DGA) for the predoctoral fellowship (CPT_01_23). The authors acknowledge the use of instrumentation as well as the technical advice provided by the National Facility ELECMI ICTS, node Laboratorio de Microscopias Avanzadas (LMA) at Universidad de Zaragoza and the Analysis and Characterization service at ICB-CSIC. RPES work was carried out with the support of Diamond Light Source, instrument B07 B branch (HarwellXPS Rapid Access proposal SI40403-1).Peer reviewe
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
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
Understanding the catalytic and gas-sensing properties of metal oxide nanostructures with advanced surface science techniques
No full textTitle: Understanding the catalytic and gassensing properties of metal oxide nanostructures with advanced surface science techniques Author: Lesia Piliai Department: Department of Surface and Plasma Science Supervisor: doc. Mgr. Michael Vorochta, Ph.D., Department of Surface and Plasma Science Abstract: This thesis presents a comprehensive investigation of the catalytic and gassensing properties of CeO2, FeOx, ZnO and WO3 nanostructures. Using a combination of NAPXPS and other surface sensitive techniques, the research has elucidated the morphological and electronic structures of these metal oxides, thereby improving the understanding of their performance in catalytic and gas sensing applications. For CO oxidation, model Au/CeO2, Pt/CeO2 and Fe/CeO2 catalysts have been studied under simulated reaction conditions, focusing on the metal/oxide and gas/oxide interfaces. The results obtained shed light on the nature of surface active sites, charge distribution, redox properties and morphology of the catalyst during CO oxidation. In addition, stable FeOx epitaxial films on ceria have been successfully prepared. In the field of gassensing, 1D ZnO and WO3 nanostructures have been investigated for the detection of CO gas and ethanol vapor. By studying the gassolid interaction and correlating it with the..
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
- …
