1,720,957 research outputs found
Green synthesis of gold nanoparticles using quail egg yolk and investigation of potential application areas
No full textThe Investigation of Removing Direct Blue 15 Dye from Wastewater Using Magnetic Luffa sponge NPs
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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
Highly sensitive glucose sensor based on ZnO NPs as a biomimetic enzyme
No full textResearch Development Center of Ataturk UniversityAtaturk University; Ataturk University, TurkeyAtaturk University; [FAD-2018-6321]This research has been performed under the project numbered FAD-2018-6321 and supported by the Research Development Center of Ataturk University. The authors acknowledged the support of Ataturk University, Turkey, for this work. The authors, Hayrunnisa Nadaroglu and Azize Alayli Gungor, hereby confirm that this manuscript is performed according to guidelines and has not already been published nor is it under consideration for publication elsewhere. This article does not contain any studies with human or animal subjects.In this work, the development of zinc biosensors based on zinc nanoparticles (Zn NPs) biomimetic enzymes were carried out to spectrophotometrically detect glucose in food samples. Briefly; Glucose oxidase enzyme reacts with glucose in food samples to form gluconic acid and H2O2. Behind; the peroxide formed can be measured spectrophotometrically using ABTS substrate with the enzyme mimic effect of Zn NPs. In this way, the amount of glucose was determined by a simple, effective and selective method by measuring the change in absorbance of the reaction medium, which changed by oxidation. ZnO NPs were obtained from Zn(NO3)(2) by green synthesis method using raw fig extract. Then, the amount of glucose in some food samples was determined using ZnO NPs. The results showed that the glucose content in the samples was exactly and reproducibly measured with a correlation coefficient of 0.9812 at 3.47 mM-27.78 mM concentrations. This will greatly simplify the design and manufacture of the new biosensor, which can be used for glucose fixation in food samples in an inexpensive, efficient, environmentally friendly and fast manner
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
Biosynthesis and Characterization of Copper Oxide Nanoparticles using Cimin Grape (Vitis vinifera cv.) Extract
No full textNowadays,
nanoparticle synthesis has been a very important research area because of the wide
use of nanoparticles in many fields. Green synthesis is one step ahead of other
synthesis methods due to both cost reduction in production and environmentally friendly
approach. For these reasons, we chose green synthesis method which is nature friendly
in our research. In this study, it was aimed synthesis of copper nanoparticles by
the green synthesis method using the water extract of Erzincan Cimin grape (Vitis vinifera cv. Black plum) from 0.1 M
CuCl2.2H2O in the reaction medium. Then, optimum conditions
for the green synthesis reaction had been determined and product optimization of
copper nanoparticles was made. Optimum conditions for synthesis were measured at
a wavelength of 355 nm (for CuO nanoparticles). It was observed that the best synthesis
reaction was occurred at pH 5, temperature 60 °C, 0.05 M metal ion concentration
and within the 60 minutes.The characterization of the CuO nanoparticles was obtained
then was characterized using spectroscopic techniques such as UV-VIS, FTIR, XRD
and SEM. When the chromatograms obtained using these techniques were examined, it
was understood that 25-50 nm morphologically homogeneous nanoparticles were synthesized.
Due to the new physical and chemical properties of obtained copper nanoparticles
using a cost-effective and environmentally friendly green synthesis method using
water extract of Erzincan Cimin Grape; it was thought that in many areas (optical,
biosensors, etc.) could be used
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