1,721,970 research outputs found
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
Heteroatom-doped photoreduced graphene oxide photocatalysts for removal of volatile organic compounds / Tai Xin Hong
No full textIndoor air quality (IAQ) has become a great concern as people today spend most of their time indoors, particularly during the Covid-19 pandemic era. Indoor air pollutants such as volatile organic compounds (VOCs) significantly deteriorate air quality and endanger human health. Photocatalytic oxidation (PCO) is a promising method for air remediation because of its ability to operate under ambient conditions to degrade and mineralise VOCs into harmless compounds such as carbon dioxide (CO2). Recently, the use of metal-free photocatalyst has emerged as a cost-effective, sustainable, lightweight, and earth abundance approach for various photocatalytic applications. Graphene oxide (GO) is a promising metal-free carbon-based photocatalyst that showed photocatalytic activities for dye degradation, water splitting, and CO2 reduction. Nevertheless, the application of GO and heteroatom (e.g, boron (B), nitrogen (N), and fluorine (F)) doped GO in the PCO of air pollutants have not been explored yet. There are two common strategies to enhance the photoactivity and properties of GO, namely reduction and heteroatom-doping. Therefore, an effective, green, and scalable method to simultaneously reduce and dope GO was developed. In this study, GO was transformed into photoreduced graphene oxide (PRGO) and doped with heteroatom via a facile photoirradiation technique. The photoactivity of the PRGO was 2.4 times better than GO due to the narrower band gap and slower charge carrier recombination rate. Besides that, GO was simultaneously reduced and doped via photoirradiation with B, N, and F heteroatoms as BPRGO, NPRGO, and FPRGO, respectively. The VOCs photodegradation efficiencies of the photocatalysts followed the pseudo-first-order kinetic (k) as according to this sequence: NPRGO (100%, k = 0.38 h-1) > FPRGO (80.4%, k = 0.26 h-1) > BPRGO (67.7%, k = 0.19 h-1) > PRGO (27.0%, k = 0.06 h-1) > GO (13.7%, k = 0.03 h-1). Additionally, VOCs were successfully mineralised into CO2 by the heteroatom-doped PRGO photocatalysts with mineralisation efficiency up to 100% for NPRGO-0.5. The improved photocatalytic activities of the heteroatoms-doped PRGO were attributed to their increment of charge carrier densities after doping, which resulted in slower charge carrier recombination rates. Among the heteroatom-doped PRGO, the NPRGO had the slowest charge carrier recombination rate because of its n-type conductivity. As an n-type semiconductor, the N dopants formed a shallow donor level near the conduction band of NPRGO. During photocatalysis, if a photoexcited electron falls from the conduction band of NPRGO, the shallow dopant level could trap the electron and reemit it back to the conduction band easily, therefore preventing the electron from recombining with a hole at the valence band. Moreover, the NPRGO could be reused for five PCO cycles without any significant loss in photoactivity. Through mechanism studies, it was determined that the photogenerated hole was the most significant reactive species in the PCO processes. This study provides new insights into a scalable photoirradiation method for producing effective metal-free PRGO-based photocatalysts for air purification
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
Photodegradation of 4-chlorophenol by UV/photocatalysts: the effect of the interparticle electron transfer process
No full textAppropriate 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
Key factors in Brownfield regeneration. A case study of the Xin Hong village within the Jinqiao EPZ industrial park
No full textLAUREA MAGISTRALEStudio dei fattori chiave che hanno influenzato il processo di de-urbanizzazione di un villaggio urbano all'interno di un parco industriale di Shanghai. Successiva identificazione di strategie di rigenerazione urbana basate sulle aspettative del governo e dei cittadini e relativo progetto di riqualificazione.Processes of urban regeneration, new town development and strategic planning in globalizing cities are challenges extremely influential in the contemporary age. The urbanization rate in China already lies above 50% and will further increase rapidly in the future, this is the reason why the goals established by the Shanghai Master Plan (1999-2020) approved by the State Council of China in 2001, expect to achieve “zero” growth of the total urban built area, in order to regenerate Shanghai as an eco-city (or smart city). The development of Export Processing Zones EPZs, Free Trade Zones FTZs, Bonded Logistic Parks BLPs as well as other kind of industrial parks pushed the rapid economic growth of Chinese cities starting in the end of the Twenty century. The Jinqiao EPZ in Pudong New Area has been considered by the State Council in 2006 as the most economically successful industrial park in Shanghai. Despite the economic goals already achieved, there are some hidden catalyst effects produced by these EPZs on the development of urban villages. The study is aimed to identify what are the key factors leading to the de-urbanization process and unnecessary thwart of land use of the Xin Hong Village which represents the outcome of the massive industrialization of the Jinqiao EPZ: a brownfield which nowadays requires an urban regeneration process. The research questions behind the implementation of this study are two. The first one expects to identify the key-factors swayed by massive industrial development that played a role in defining the outcome of an urban village transformation as a brownfield. The research methods applied are the analysis of government’s tools, programs and plans together with the citizen participation phase carried out through interviews directly on the field of analysis. The expectations and targets defined for the development of the Jinqiao EPZ and the goals achieved as well as the current threats permit to clarify how the de-urbanization process took place and allow the identification of seven key-factors. Once described the factors and forces behind the constant decline of this neighborhood, the second research question is aimed to discover the most suitable urban regeneration strategies which are going to interrupt the de-urbanization process shaping the Xin Hong Village evolution so far. The research methods applied in this case are once again the analysis of government’s tools and citizens’ expectations, which allow the identification of strategies and desires for the future regeneration, together with the application of three planning theories introduced by Paul Davidoff, Randall G. Holcombe and Aaron Wildavsky. The balance between government’s will and citizens’ expectations has been drawn on the base of renewed planning theories which permit the identification of six strategies. The study ends with the definition of an Advocacy Plan and a related urban regeneration project for the future transformation of the Xin Hong Village
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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