1,720,994 research outputs found
MS-1-P-3446 Structure and Morphology Study of Pure and Mixed ZnO and ZnO2 Nanoparticles
Get PDFSynthesis of ZnO2 nanoparticles was performed via a sol–gel technique assisted with UV
irradiation. One gram of zinc acetate dehydrate, Zn(CH3COO)2.2H2O, was dissolved under
vigorous stirring in a mixture of 50 ml distilled water and 5 ml of 30% H2O2. The resulting
solution was then irradiated with a 300W Ultra-Vitalux lamp (Osram), positioned 10 cm above
the solution, for 30 min at ambient temperature. This procedure resulted in the formation of a
white zinc peroxide colloidal suspension. The ZnO2 nanoparticles were precipitated by
centrifugation. The precipitate was then washed using distilled water until a pH of 8 was
reached. Finally the resultant white solid was dried at 80 °C for 12 h, similar to follow in the
reference [1]. The resultant powder was annealed between 100 and 220°C for 1 h in an oven
with air atmosphere. The morphology, structure and domain size of the nanoparticles were
determined by X-ray diffraction, and scanning transmission electron microscopy. By X-ray
diffraction, all patterns can be indexed to the zinc peroxide phase for samples prepared up to
120°C. For a sample prepared at 160°C we had a mixture of ZnO2 and ZnO, while for particles
treated at 220°C all the material was pure ZnO
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
SINTESIS Y CARACTERIZACION DE NANOESTRUCTURAS DE MOLIBDENO
Get PDFLas nanoestructuras han generado una enorme cantidad de
investigación tanto sobre la síntesis como en la aplicación, en este
aspecto, nano-estructuras base Molibdeno similares al fulereno NO
VEO PORQUE DICES QUE SON SIMILARES, tienen aplicaciones muy
atractivas a nivel industrial, debido a sus propiedades químicas y
físicas.
En este trabajo se presenta la obtención de nanoestructuras de
Molibdeno por aspersión pirolitica (spray pyrolysis) empleando HMA
DEFINIR como precursor en un rango de temperatura de 923-1123 K
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
