1,720,961 research outputs found
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
Synthèse et application de la silice de la balle de riz à la décontamination des eaux usées.
No full textThis thesis presents the development of rice husk-derived silica (RH-SiO₂) as a sustainable adsorbent for the removal of multiple pollutants from industrial and wastewater effluents, with a particular emphasis on its potential for real-world applications. The study sought to optimise the process of extracting silica from rice husk, resulting in the production of a highly porous material with favourable adsorption characteristics. The production of RH-SiO₂ was achieved through acid leaching, pyrolysis, and calcination, resulting in a surface area of 320 m²/g and pore sizes suitable to the effective adsorption of metals and organic micropollutants (OMPs). Additionally, pyrolysis yielded potentially valuable by-products, namely bio-oil and syngas.In tests with real industrial effluent, RH-SiO₂ exhibited adsorption towards metals with a combination of different mechanisms and demonstrated the ability to retain its efficiency through multiple regeneration cycles. Although its adsorption capacity was inferior in real effluents relative to synthetic water, it remained competitive with other adsorbents. Furthermore, the thesis proposed methods to further enhance sustainability, including the utilisation of organic acids for regeneration and the implementation of continuous flow adsorption studies to optimise performance parameters.The removal of cationic and specific neutral OMPs by RH-SiO₂ was demonstrated in experiments with secondary effluent wastewater, with no evidence of breakthrough in column studies. The hydrophilic nature of the material in question served to minimise the of organic fouling, which is a common challenge in the context of activated carbon treatments. A novel cost and time-efficient methodology employing non-target screening (NTS) tools was developed to evaluate RH-SiO₂'s adsorption capacity. This methodology demonstrated the functionalities of RH-SiO₂ that were identified through the prioritisation of compounds that were only better removed by RH-SiO₂ in comparison to other materials.In conclusion, RH-SiO₂ is a promising, sustainable adsorbent with strong potential for industrial applications in water treatment. Its low cost, high adsorptive properties, and potential for scale-up make it an excellent candidate for addressing industrial and environmental challenges. Future studies will focus on evaluating its long-term stability, improving adsorption capacities, regeneration, and performance in real-world conditions.Cette thèse présente le développement de la silice dérivée de la balle de riz (RH-SiO₂) en tant qu'adsorbant durable pour l'élimination de multiples polluants des effluents industriels et des eaux usées, en mettant particulièrement l'accent sur son potentiel pour des applications dans le monde réel. L'étude a cherché à optimiser le processus d'extraction de la silice à partir de la balle de riz, ce qui a permis de produire un matériau très poreux présentant des caractéristiques d'adsorption favorables. La production de RH-SiO₂ a été réalisée par lixiviation acide, pyrolyse et calcination, ce qui a permis d'obtenir une surface de 320 m²/g et des pores de taille adaptée à l'adsorption efficace des métaux et des micropolluants organiques (OMP). En outre, la pyrolyse a permis d'obtenir des sous-produits potentiellement intéressants, à savoir de la bio-huile et du gaz de synthèse.Lors d'essais pratiques sur des effluents industriels, RH-SiO₂ a montré une adsorption des métaux via une combinaison de différents mécanismes et a démontré sa capacité à conserver son efficacité au cours de plusieurs cycles de régénération. Bien que sa capacité d'adsorption soit inférieure dans les effluents réels par rapport à l'eau synthétique, elle est restée compétitive par rapport à d'autres adsorbants. En outre, la thèse propose des méthodes pour améliorer encore la durabilité, notamment l'utilisation d'acides organiques pour la régénération et la mise en œuvre d'études d'adsorption en flux continu pour optimiser les paramètres de performance.L'élimination des OMP cationiques et neutres spécifiques par le RH-SiO₂ a été démontrée lors d'expériences avec des eaux usées d'effluents secondaires, sans preuve de percée dans les études en colonne. La nature hydrophile du matériau en question a permis de minimiser l'encrassement organique, qui est un défi courant dans le contexte des traitements au charbon actif. Une nouvelle méthodologie économique et rapide utilisant des outils de criblage non ciblé a été mise au point pour évaluer la capacité d'adsorption du RH-SiO₂. Cette méthodologie a démontré les fonctionnalités de RH-SiO₂ qui ont été identifiées par la hiérarchisation des composés qui n'étaient que mieux éliminés par RH-SiO₂ par rapport à d'autres matériaux.En conclusion, RH-SiO₂ est un adsorbant prometteur et durable avec un fort potentiel pour des applications industrielles dans le traitement de l'eau. Son faible coût, ses propriétés adsorbantes élevées et son potentiel de mise à l'échelle en font un excellent candidat pour relever les défis industriels et environnementaux. Les études futures se concentreront sur l'évaluation de sa stabilité à long terme, l'amélioration des capacités d'adsorption, la régénération et la performance dans des conditions réelles
Synthèse et application de la silice de la balle de riz à la décontamination des eaux usées.
No full textThis thesis presents the development of rice husk-derived silica (RH-SiO₂) as a sustainable adsorbent for the removal of multiple pollutants from industrial and wastewater effluents, with a particular emphasis on its potential for real-world applications. The study sought to optimise the process of extracting silica from rice husk, resulting in the production of a highly porous material with favourable adsorption characteristics. The production of RH-SiO₂ was achieved through acid leaching, pyrolysis, and calcination, resulting in a surface area of 320 m²/g and pore sizes suitable to the effective adsorption of metals and organic micropollutants (OMPs). Additionally, pyrolysis yielded potentially valuable by-products, namely bio-oil and syngas.In tests with real industrial effluent, RH-SiO₂ exhibited adsorption towards metals with a combination of different mechanisms and demonstrated the ability to retain its efficiency through multiple regeneration cycles. Although its adsorption capacity was inferior in real effluents relative to synthetic water, it remained competitive with other adsorbents. Furthermore, the thesis proposed methods to further enhance sustainability, including the utilisation of organic acids for regeneration and the implementation of continuous flow adsorption studies to optimise performance parameters.The removal of cationic and specific neutral OMPs by RH-SiO₂ was demonstrated in experiments with secondary effluent wastewater, with no evidence of breakthrough in column studies. The hydrophilic nature of the material in question served to minimise the of organic fouling, which is a common challenge in the context of activated carbon treatments. A novel cost and time-efficient methodology employing non-target screening (NTS) tools was developed to evaluate RH-SiO₂'s adsorption capacity. This methodology demonstrated the functionalities of RH-SiO₂ that were identified through the prioritisation of compounds that were only better removed by RH-SiO₂ in comparison to other materials.In conclusion, RH-SiO₂ is a promising, sustainable adsorbent with strong potential for industrial applications in water treatment. Its low cost, high adsorptive properties, and potential for scale-up make it an excellent candidate for addressing industrial and environmental challenges. Future studies will focus on evaluating its long-term stability, improving adsorption capacities, regeneration, and performance in real-world conditions.Cette thèse présente le développement de la silice dérivée de la balle de riz (RH-SiO₂) en tant qu'adsorbant durable pour l'élimination de multiples polluants des effluents industriels et des eaux usées, en mettant particulièrement l'accent sur son potentiel pour des applications dans le monde réel. L'étude a cherché à optimiser le processus d'extraction de la silice à partir de la balle de riz, ce qui a permis de produire un matériau très poreux présentant des caractéristiques d'adsorption favorables. La production de RH-SiO₂ a été réalisée par lixiviation acide, pyrolyse et calcination, ce qui a permis d'obtenir une surface de 320 m²/g et des pores de taille adaptée à l'adsorption efficace des métaux et des micropolluants organiques (OMP). En outre, la pyrolyse a permis d'obtenir des sous-produits potentiellement intéressants, à savoir de la bio-huile et du gaz de synthèse.Lors d'essais pratiques sur des effluents industriels, RH-SiO₂ a montré une adsorption des métaux via une combinaison de différents mécanismes et a démontré sa capacité à conserver son efficacité au cours de plusieurs cycles de régénération. Bien que sa capacité d'adsorption soit inférieure dans les effluents réels par rapport à l'eau synthétique, elle est restée compétitive par rapport à d'autres adsorbants. En outre, la thèse propose des méthodes pour améliorer encore la durabilité, notamment l'utilisation d'acides organiques pour la régénération et la mise en œuvre d'études d'adsorption en flux continu pour optimiser les paramètres de performance.L'élimination des OMP cationiques et neutres spécifiques par le RH-SiO₂ a été démontrée lors d'expériences avec des eaux usées d'effluents secondaires, sans preuve de percée dans les études en colonne. La nature hydrophile du matériau en question a permis de minimiser l'encrassement organique, qui est un défi courant dans le contexte des traitements au charbon actif. Une nouvelle méthodologie économique et rapide utilisant des outils de criblage non ciblé a été mise au point pour évaluer la capacité d'adsorption du RH-SiO₂. Cette méthodologie a démontré les fonctionnalités de RH-SiO₂ qui ont été identifiées par la hiérarchisation des composés qui n'étaient que mieux éliminés par RH-SiO₂ par rapport à d'autres matériaux.En conclusion, RH-SiO₂ est un adsorbant prometteur et durable avec un fort potentiel pour des applications industrielles dans le traitement de l'eau. Son faible coût, ses propriétés adsorbantes élevées et son potentiel de mise à l'échelle en font un excellent candidat pour relever les défis industriels et environnementaux. Les études futures se concentreront sur l'évaluation de sa stabilité à long terme, l'amélioration des capacités d'adsorption, la régénération et la performance dans des conditions réelles
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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