1,720,986 research outputs found
Feasibility Study on High Content Reclaimed Rubberised Asphalt Mixtures for Wearing Courses
No full textThe use of Reclaimed Rubberised Asphalt Mixtures (RRAM) in road pavement construction is a significant stride in reducing reliance on new materials and reducing waste disposal. RRAM provides a sustainable, cost-effective solution for roads, boosting durability and performance while supporting environmental causes [1, 2]. However, despite its benefits, challenges remain. A thorough exploration of recycling RAM into RRAM is crucial. This study investigates into this, aiming to evaluate RRAM recyclability through a tailored three-step procedure: 1) laboratory production of RRAM, 2) designing RRAM asphalt mixtures using the SUPERPAVE5 concept, and 3) performance-based characterization of RRAM. This comprehensive approach assesses rutting, cracking, and moisture damage resistance. The results highlight RRAM's potential benefits in road construction, shedding light on its recyclability and paving the way for future sustainability-focused research in road-building practices
Advanced Mixing Rheometry for Dynamic Shear Rheometer Testing of Highly Heterogeneous Bituminous Binders
No full textIn the era of asphalt mixtures designed with any type of admixture and secondary materials, it is not rare for bitumen technologists to deal with issues in the testing setup of new materials and/or in the interpretation of non-conventional trends of results. Within this family, it happens to have multi-phase bituminous binders with a tendency to phase separation, here defined as highly heterogeneous bituminous binders (HHBBs). Amongst the HHBBs there is certainly the crumb rubber modified bitumen which is being used worldwide even though presenting technical drawbacks, limiting further implementation, such as its stability during storage at high temperature at the asphalt plants. A similar scenario might be encountered also at laboratory scale during high-temperature rotational viscosity testing where the use of conventional methods, developed mainly for the characterization of homogeneous binders, may not be suitable for HHBBs. This study wants to address this technical issue by introducing enhanced mixing rheometry for cup-and-bob systems as an optimal solution tailored for dynamic shear rheometers rotational testing of HHBBs. The investigation evaluates two types of HHBBs, an 18% Crumb Rubber Modified Binder and a 6% Polymer Modified Binder, by testing them through four different impellers to record possible differences in viscosity measurement trends. The laboratory experiments were augmented by a numerical analysis to visually assess the stability of HHBBs during rotational testing. The results obtained from this combined empirical and numerical approach indicate that the current rotational measurement standards are inadequate for HHBBs due to their poor mixing efficiency. However, the use of the dual helical ribbon (ST-26.5-LPG) stirrer, which exhibits improved mixing performance, appears to resolve this issue
Advanced Mixing Rheometry for Dynamic Shear Rheometer Testing of Highly Heterogeneous Bituminous Binders
No full textIn the era of asphalt mixtures designed with various admixtures and secondary materials, bitumen
technologists often encounter challenges in testing new materials and interpreting unconventional
results. One such challenge arises with highly heterogeneous bituminous
binders (HHBBs), including crumb rubber-modified bitumen, which is widely used despite technical
drawbacks such as poor stability during storage at high temperatures in asphalt plants.
Similar issues may arise during laboratory-scale high-temperature rotational viscosity testing,
in which conventional methods designed for homogeneous binders may not be suitable for
HHBBs. This study aims to address these challenges by introducing enhanced mixing rheometry
for cup-and-bob systems as an optimal solution tailored for dynamic shear rheometers’
rotational testing of HHBBs. The investigation evaluates two types of HHBBs (an 18 % crumb
rubber modified binder and a 6 % polymer-modified binder) by testing them with four different
impellers to record possible differences in viscosity measurement trends. Laboratory experiments
are augmented by numerical analysis to visually assess the stability of HHBBs during
rotational testing. Results from this combined empirical and numerical approach indicate that
current rotational measurement standards are inadequate for HHBBs because of poor mixing
efficiency. However, the use of the dual helical ribbon (ST-26.5-LPG) stirrer, which exhibits
improved mixing performance, appears to resolve this issue. Therefore, the authors recommend
adopting this specific testing geometry to obtain more accurate high-temperature viscosity
measurements of HHBBs, thereby enhancing the realism of the result
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
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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