1,720,957 research outputs found
Polymeric hydrogels obtained using a redox initiator: Application in Cu(II) ions removal from aqueous solutions
No full textThe active approach for background modeling is described in this report. Under this technique, the background is assessed during the optimization of the peak parameters. In contrast, under the traditional (static ) approach, the background is defined prior to peak fitting. The active has many advantages over the static, such as that the peak areas are often underestimated under the static approach. The active technique allows for treating the background as a combination of various background types. There are many reports in the literature where some of the features of the active approach are employed. Also described in this report is the Shirley-Vegh-Salvi-Castle (SVSC) background, which is a variant of the Shirley-Proctor-Sherwood method that does not require iterations. The advantages of the SVSC over the Shirley-Proctor-Sherwood background are fully described. Copyright " 2014 John Wiley & Sons, Ltd.",,,,,,"10.1002/sia.5453",,,"http://hdl.handle.net/20.500.12104/43783","http://www.scopus.com/inward/record.url?eid=2-s2.0-84908164965&partnerID=40&md5=3b22c892c8ccf0d1f6884c8ee74df4d9",,,,,,"10-nov",,"Surface and Interface Analysis",,"89
The slope-background for the near-peak regimen of photoemission spectra
No full textPhotoemission data typically exhibits a change on the intensity of the background between the two sides of the peaks. This step is usually very well reproduced by the Shirley-Sherwood background. Yet, the change on the slope of the background in the near-peak regime, although usually present, is not always as obvious to the eye. However, the intensity of the background signal associated with the evolution of its slope can be appreciable. The slope-background is designed to empirically reproduce the change on the slope. Resembling the non-iterative Shirley method, the proposed functional form relates the slope of the background to the integrated signal at higher electron kinetic energies. This form can be predicted under Tougaard-Sigmund's electron transport theory in the near-peak regime. To reproduce both the step and slope changes on the background, it is necessary to employ the slope-background in conjunction with the Shirley-Sherwood background under the active-background method. As it is shown for a series of materials, the application of the slope-background provides excellent fits, is transparent to the operator, and is much more independent of the fitting range than other background methods. The total area assessed through the combination of the slope and the Shirley-Sherwood backgrounds is larger than when only the Shirley-Sherwood background is employed, and smaller than when the Tougaard background is employed. © 2013 Elsevier B.V. All rights reserved
The role of the estrous cycle in activity-based anorexia: A comparative study of sexual differences in rats
No full textPhotoemission data typically exhibits a change on the intensity of the background between the two sides of the peaks. This step is usually very well reproduced by the Shirley-Sherwood background. Yet, the change on the slope of the background in the near-peak regime, although usually present, is not always as obvious to the eye. However, the intensity of the background signal associated with the evolution of its slope can be appreciable. The slope-background is designed to empirically reproduce the change on the slope. Resembling the non-iterative Shirley method, the proposed functional form relates the slope of the background to the integrated signal at higher electron kinetic energies. This form can be predicted under Tougaard-Sigmund's electron transport theory in the near-peak regime. To reproduce both the step and slope changes on the background, it is necessary to employ the slope-background in conjunction with the Shirley-Sherwood background under the active-background method. As it is shown for a series of materials, the application of the slope-background provides excellent fits, is transparent to the operator, and is much more independent of the fitting range than other background methods. The total area assessed through the combination of the slope and the Shirley-Sherwood backgrounds is larger than when only the Shirley-Sherwood background is employed, and smaller than when the Tougaard background is employed. " 2013 Elsevier B.V. All rights reserved.",,,,,,"10.1016/j.elspec.2013.07.006",,,"http://hdl.handle.net/20.500.12104/45285","http://www.scopus.com/inward/record.url?eid=2-s2.0-84882801954&partnerID=40&md5=885a608599d9ff069866cb5557012f24",,,,,,,,"Journal of Electron Spectroscopy and Related Phenomena",,"7
Practical methods for background subtraction in photoemission spectra
No full textThe active approach for background modeling is described in this report. Under this technique, the background is assessed during the optimization of the peak parameters. In contrast, under the traditional (static ) approach, the background is defined prior to peak fitting. The active has many advantages over the static, such as that the peak areas are often underestimated under the static approach. The active technique allows for treating the background as a combination of various background types. There are many reports in the literature where some of the features of the active approach are employed. Also described in this report is the Shirley-Vegh-Salvi-Castle (SVSC) background, which is a variant of the Shirley-Proctor-Sherwood method that does not require iterations. The advantages of the SVSC over the Shirley-Proctor-Sherwood background are fully described. Copyright © 2014 John Wiley & Sons, Ltd
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
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
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