1,721,004 research outputs found
High-performance Fe3O4-terephthalaldehyde magnetic-nanocomposite for removal phenanthrene and 9-phenanthrol: A comprehensive experimental and theoretical analysis
No full textAscribing to the serious environmental and health risks caused by phenanthrene (PENE) and its dangerous degradation intermediate, 9-phenanthrol (9-PENE), solving their contamination problem was extremely urgent. In this work, a novel Fe3O4-terephthalaldehyde (Fe3O4-TERE) magnetic nanomaterial was fabricated by introducing aromatic rings onto Fe3O4 nanoparticles through encapsulation and grafting technique. The Fe3O4 core provided convenience for the subsequent recycling and regeneration. The grafted aromatic carbons could act as adsorption active sites to form 7C-7C interaction with PENE/9-PENE's aromatic rings, thus improving the capture performance. The properties of the prepared magnetic nanomaterials were investigated via multiple characterization techniques. As expected, the Fe3O4-TERE could be utilized for effectively reducing the contamination risk of PENE and 9-PENE. Furthermore, the Fe3O4-TERE possessed with excellent regeneration performance. The abundant homogeneous reaction sites of Fe3O4-TERE provided possibility for the monolayer adsorption of PENE and 9-PENE. There were multiple microscopic interactions and driving forces jointly or individually participated the multi-stage adsorption reaction. Moreover, density functional theory calculations not only analyzed the validity and existence form of the 7C-7C interaction under different adsorption configuration modes, but also provided deeply perspectives related to the microscopic bonding mechanism. This work proposed a promising fabrication strategy for magnetic nanomaterials used for removing and remediation of polycyclic aromatic hydrocarbons contamination, as well as provided profound theoretical perspectives for analyzing the adsorption mechanism
Fe3O4-4,4 '-biphenyldicarboxaldehyde superparamagnetic-nanomaterial for the high-efficiency removal of 9-phenanthrol: experimental combined with DFT investigations
No full textOwing to the more significant health and environmental risks of 9-phenanthrol (9-PROL) compared to phenanthrene, it is imminent to solve the 9-PROL pollution issue. Herein, Fe3O4-0.75-4,4 '-biphenyldicarboxaldehyde (Fe3O4-0.75BIPHENY) was synthesized via a silane coupling reaction and condensation reaction and employed as an efficient nanocomposite for the removal of 9-PROL. The magnetic core provided the possibility for its fast and convenient separation and the aromatic rings on the BIPHENY shell contributed to improving the capturing ability of 9-PROL molecules via the formation of pi-pi interactions. Multiple characterization techniques were employed to obtain a comprehensive understanding of the prepared magnetic adsorbents. Fe3O4-0.75BIPHENY not only exhibited an excellent adsorption performance towards 9-PROL, but also showed a relatively excellent regeneration performance. The homogeneous surface of Fe3O4-0.75BIPHENY provided adsorption sites for the adsorption of 9-PROL molecules, which adhered in monolayer molecular form. Importantly, density functional theory calculations provided novel deep insights into the most possible adsorption bonding mode and verified that pi-pi interactions existed in the offset stacking form. Furthermore, the visible electrostatic potential and energy orbital distribution plots demonstrated the validity of the adsorption reaction and stability of a specific configuration. This study provides guidance for the assembly of novel magnetic nanocomposites for alleviating traditional and secondary pollution caused by polycyclic aromatic hydrocarbons
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
THE RELATION BETWEEN INSTANTONS AND NUCLEON STRUCTURE
No full textA scheme of combining the theory of many instantons and the effective Lagrangian of QCD is proposed to study the nucleon structure. With this approach, the vacuum structure of nonperturbative QCD is discussed and a reasonable potential of quark confinement is obtained. The calculated results of the constituent quark mass and the decay constant of pion agree with experimental data quite well.Physics, MultidisciplinarySCI(E)中国科学引文数据库(CSCD)4ARTICLE2253-2562
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
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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