1,720,957 research outputs found
Mixed experimental-numerical analysis of ideal knee prostheses lubricated with aqueous dispersions of collagen gelled media
No full textAqueous dispersions of gelled collagen particles. Part 1: experimental characterization of stiffness and rheological properties
No full text
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
Effect of mixtures of H2O (g) and CO2 (g) on the thermal half decomposition of dolomite natural stone in high CO2 pressure regime
No full textNatural dolomite powders have been decomposed in high CO2 partial pressure regime with H2O (g) flowing and in the temperature range 913-973 K. All kinetics and microstructure data concerning the first half decomposition step have been caompared with equivalent data obtained from the same dolomite powders decomposed under the same conditions with no H2O fluxing. The water vapor reduced the value of the total apparent enthalpy of the reaction from 440 +/- 10 to 345 +/- 10 kJmol-1, but the rate-limiting step of the half decomposition process is not changed, consisting in each case in the transport of the CO2 from the reacting interface. It has been showed that this possibility is plausible because H2O (g) can enhance the sintering of the formed MgO crystallites with subsequent changes of the CO2 mode of adsorpion on the MgO surfaces from a strong bonded regime to a weaker one. In presence of H2O (g) and high CO2 (g) pressure, the rate-limiting step of the first half decomposition of dolomite is still the transport of CO2 across the reacting interface, as it has been proved for the decompositions in CO2 environment. In the temperature range explored, H2O (g) does not change the nature of the solid products which are formed by MgO, CaCO3 and solid solution of MgO into CaCO3. The microstructure of the solid products is still formed through a shear-tranformation mechanism, but H2O (g) enhances the rate at which this step is occurring. Critical analysis of the microstructure data, allow to conclude that the stress level inside the decomposing particles is increasing and enhancing the cracking rate because H2O (g) can increase the MgO grain growth rate. These findings might explain the technical procedure used to decompose the dolomite stone in teh ancient ovens
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
- …
