1,721,017 research outputs found
Computational Data supporting "Porous covalent organic nanotubes and their assembly in loops and toroids"
No full textComputational research data supporting the article:
Kalipada Koner, Shayan Karak, Sharath Kandambeth, Suvendu Karak, Neethu Thomas, Luigi Leanza, Claudio Perego, Luca Pesce, Riccardo Capelli, Monika Moun, Monika Bhakar, Thalasseril G. Ajithkumar, Giovanni M. Pavan, and Rahul Banerjee, "Porous Covalent Organic Nanotubes and Toroids: A Carbon Nanotube Analogue
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
Sampling problems in the radiocarbon dating of old mortars and plasters with the “pure lime lumps” technique
No full textSeveral scientific papers describe the radiocarbon dating of lime mortars and plasters [Folk and Valastro, 1976; Van Strydonck et al., 1992; Hale et al., 2003; Nawrocka et al., 2005]. In many cases, these lime based mixtures are dated by using pieces of organic materials contained within the mix such as charcoal, wood or straw. However, this type of application can only provide post-quem chronological information. The results obtainable, in fact, are not connected with the hardening process of lime but with the formation process of the organic material embedded in the mixture and this can be a quite important limitation, in the archaeological interpretation of the results obtained by radiocarbon dating.
Rarer and with not yet fully reproducible results are the papers dealing with the radiocarbon dating of calcium carbonate contained in the mortars as binder phase. In this case, the 14 C dating is carried out directly on the calcium carbonate precipitated during the hardening process of lime by the reaction between calcium hydroxide and atmospheric carbon dioxide. As the content of 14 C contained in the newly formed calcium carbonate reflects the 14 C concentration in the atmosphere at the time of hardening, this material can be used for the radiocarbon dating of old mortars and plasters.
Although the method is quite simple in its basis principle, relevant issues come from the contamination problems of the dated samples with other carbon sources. Grains of carbonate sand or underburned pieces of the same limestone used to produce the lime, that are originally mixed with the binder cannot be, in fact, completely removed from the mixtures. These materials do not contain radioactive carbon 1 but behave as the carbonated lime during the analyses. For this reason, the radiocarbon dating of old lime-based mixtures has not yet been used intensively over the past decades.
Over the past years, this problem led to the development of new techniques for the sample preparation (e.g. Sonninen and Junger, 2001) and among these techniques, the so called “pure lime lumps” represents a fast and reliable method. The technique is based on the use of lumps of pure lime, very often embedded in old lime based mixtures as material for the radiocarbon dating.
Because these lumps are made of pure lime [Bugini and Toniolo, 1990] any contamination problem is avoided [Pesce and Ball, 2012]. However, despite the remarkable results already achieved with this technique [Pesce et al., 2009; Pesce et al., 2012; Pesce et al., 2013], the sample collection is still a very important issue for a successful application of the radiocarbon dating.
This paper describes the main sampling problems faced during a research on the accuracy and precision of the “pure lime lumps” technique, founded by the University of Genoa 2 and carried out together by the University of Genoa and the and CEDAD in Italy and the University of Bath in the United Kingdom. Results of this research were presented at the 21 st International Radiocarbon Conference, held in Paris from 9th to 13th July 2012
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
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
- …
