1,720,978 research outputs found
Corrosion Inhibition Performance of 2,3-dimercaptosuccinic Acid on Copper
No full textObjective 2,3-dimercaptosuccinic acid(DMSA) was synthesized with maleic acid as raw material, to study the corrosion inhibition performance of DMSA on copper in 0.5 mol/L NaOH solution. Methods DMSA was prepared by methods of addition, elimination, addition and hydrolysis with maleic acid as raw material, the structure of which was then characterized by Fourier infrared spectroscopy (IR) and mass spectrometry (MS). The corrosion rates of copper in 0.5 mol/L NaOH supplemented with different concentrations of DMSA were investigated by static weight loss tests, the corrosion inhibition performance was investigated by polarization curves and electrochemical impendence spectroscopy (EIS), respectively. Copper surface corrosion morphology was observed by scanning electronmicroscopy (SEM). Results IR and mass spectrometry jointly confirmed that the target product was DMSA. The corrosion rates of Cu in 0.5 mol/L NaOH were 7.60, 3.25, 2.13 mug/(cm~2·h) with supplementation of 0, 2.5, 5.0 g/L DMSA, respectively. When the DMSA concentration in NaOH solution was 5.0 g/L, the inhibition efficiency reached 94.92%. Conclusion DMSA could absorb on the copper surface, decrease water erosion and increase the corrosion product film resistance and the charge transfer resistance. DMSA was an anodic inhibitor
One-step coagulation to construct durable anti-fouling and antibacterial cellulose film exploiting Ag@AgCl nanoparticle- triggered photo-catalytic degradation
No full textAn anti-fouling and antibacterial surface of cellulose film was obtained by one-step coagulation of the cellulose-LiCl/Dimethyl acetamide (DMAc) solution with AgNO3 and polyvinyl pyrrolidone (PVP). The AgCl nanocrystals were embedded on the surface of cellulose film with the assistance of PVP, and the Ag@AgCl was formed due to the partly decomposition of AgCl under the visible-light irradiation. Morphology and size of the Ag@AgCl in cellulose matrix could be regulated by changing the concentration of PVP. From a series of comparative tests, Ag@AgCl could be stably embedded on cellulose film at the concentration of 1 wt% PVP, and its photo-degradation efficiency could be still retained 89% after 5-cycle testing. Meanwhile, a dramatic reduction in viable bacteria was also observed within 120 min of exposure on this film, and when exposure time was 180 min, no active bacteria was observed. This work provided a simple pathway to construct the functional cellulose film which could be applied as packaging materials
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
In situ controllable synthesis of Ag@AgCl in cellulose film and its effect on anti-fouling properties
No full textCellulose-Ag@AgCl composite films were fabricated by one-step coagulation of the cellulose/1-Butyl-3-methylimidazolium chloride (BmimCl)solution with AgNO3. AgCl was firstly formed when AgNO3 was added into cellulose/BmimCl solution, and then the formed AgCl was further reacted with excess Cl-, leading to the complete dissolution of AgCl. The AgCl crystal would grow again from cellulose matrix in the air after the film formation. Meanwhile, AgCl could be partly decomposed into Ag degrees and formed Ag@AgCl under visible-light irradiation. The morphology of Ag@AgCl in cellulose matrix could be regulated by changing the molar ratio of BmimCl and AgNO3, the growth time of AgCl crystal and the concentration of cellulose solution. The cellulose composite film with stamen-like Ag@AgCl showed the best anti-fouling properties for methyl orange reagent under visible-light irradiation. This work also provided a simple pathway to regulate the morphology of Ag@AgCl in cellulose or other polymer matrices
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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