1,721,066 research outputs found
Gallerie e Grandi Opere Sotterranee
No full textDal mese di luglio 2018 mi è stato chiesto di entrare a far parte del Comitato Editoriale della rivista Gallerie e Grandi Opere Sotterranee. Attualmente sono uno degli Editor della Rivista
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
Experimental study of rheological characteristics of bentonite-based drilling fluids
No full textBentonite and polymer-based drilling slurries are widely used in numerous geotechnical applications such as Slurry Shield TBM tunnelling, MicroTunnelling, Horizontal Directional Drilling and other trenchless technologies, piles and diaphragms constructions. In all cases, the rheological characteristics of the fluids must be correctly adjusted to ensure the stability of the excavation, proper lubrication and transportability of the excavated material. To date, there are several international standards and many best practices, empirical abacuses and indications for the definition of rheological properties of drilling fluids. However, there is often a lack of correlation between the results of different tests or measurements that can be carried out in laboratories using rheometers, viscometers and other sensitive and accurate equipment, and the rapid measurements that are widely used on site. The study presented in this paper involves the systematic performance of laboratory tests and rapid measurements on a natural bentonite used in the construction of tunnels and other underground works. The aim is to provide a broad overview of the rheological characteristics of drilling fluids prepared at different bentonite dosages, a series of correlations between the results of laboratory tests carried out using different mixing speed and mixing time. The results of the study support a better selection of the correct properties during drilling, an informed choice of the most appropriate measuring instruments and a more accurate measurement and control of the rheological properties of drilling fluids
Preliminary evidences on the influence of grains micro-structural features on the TBM tools wear
No full textThe wear of the excavation tools during the mechanized tunnelling in coarse grained soils is an extremely widespread phenomenon that should be taken into account to properly develop an excavation project. In fact, the excessive tools wear reduces the penetration speed, increases the energy consumption and requires stops necessary to replace the worn tools. Thus, to optimize the process, the tools consumption rate should be necessarily predicted in advance. Different works have focused the attention on the relationship between the tools wear and the quartz content of the soil to be excavated. In this research, a step forward is made focusing the attention on the role played by the morphology of the grains in the wearing process. The paper includes some experimental results of abrasion tests carried out on different sand samples. The results gathered lead to evaluate the influence of grain morphology of coarse soils on the wear of TBM tools. The experimental data reported are part of a wide research project aiming to link the mechanical behaviour of coarse soils with the grain morphology in different engineering applications
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
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