1,720,966 research outputs found
Laboratory assessment of recycling waste silt as filler in sustainable asphalt concretes for pavements
No full textDue to the modernization of the construction industry, the use of waste is an attractive trend with high potential for many researchers. The majority of the waste materials that are recycled to produce new construction materials are usually by-products obtained from a variety of several manufacturing processes, such as the aggregate washing process. Recycling these materials is of utmost importance since it could reduce the adverse environmental impacts resulting from landfilling. The concept of producing asphalt mixes with waste materials serves as a way to reduce the enormous volume of wastes produced from various sources, which are dumped into lakes or to other water bodies. This study aimed to investigate the feasibility of including silt, a by-product of limestone aggregate production, obtained from S.A.P.A.B.A. s.r.l., as a filler in HMA. Asphalt concrete mixtures are composed of two main components, which are aggregates and binders. Several types of research have shown the importance and the influence of filler in controlling the physical and mechanical properties of HMAs. The main objective of this research is to investigate and assess the effects caused within HMA by using Waste Silt filler. For this purpose, rheological and mechanical tests have been performed on the bituminous mastics and HMAs specimens, respectively. Frequency sweep and multiple stress creep recovery tests of the mastic showed similar behavior of samples produced with untreated and thermally treated waste silt as the filler with those of the control sample produced with common limestone filler. All samples had same resistance against rutting. Moreover, Marshall stability results were used to determine the optimum binder content, which was determined as 5.5% for all mixtures, regardless of filler type used. Finally, the ITS of the HMA mixtures were compared. All in all, the use of Waste Silt as a filler does not negatively affect the performances of HMAs and their bituminous mastics
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
Effect of blending process on rheological and volumetric properties of asphalt binder
Full text linkThe improvement of asphalt binder physical properties is possible through the addition of polymers. However, due to different physical and chemical properties of additives, each modifier requires its unique blending processing conditions. Despite these facts, not much attention has been paid to the effects of blending process on the rheological properties of asphalt binders. Therefore, it was hypothesized that different blending parameters could affect the rheological properties of asphalt binders, which in turns influence the overall performance of polymer modified blends and mixtures. As a result, three different objectives were set for the current study which were 1) to establish a blending matrix for asphalt binder modification, 2) to determine the effect of blending process on the rheological properties of asphalt binders, and 3) to determine the effect of blending process on the volumetric properties of asphalt mixtures. The blending matrix was established by selecting different parameters which potentially affected the blending outcome and the modified binders were prepared according to the established matrix. Different binder tests including softening point temperature, rotational viscosity, and dynamic shear rheometer (DSR) tests were conducted on EVA and Sasobit modified binders. Finally, the optimum asphalt content of mixtures was obtained for samples prepared at three different motor speed values of 400, 1200, and 1800 using the two mentioned polymers. The results indicated high binder stiffness for binders processed at higher blending speeds compared to binders blended at lower speeds. This was observable through higher softening point temperatures, higher viscosity values,and higher complex modulus measurements. Therefore, an increase in motor speed values increased the overall stiffness of the modified binders. Additionally,the stiffness of asphalt binders also increased with an increase in additive content. Likewise, the optimum asphalt binder content increased for mixtures containing stiffer binders. It was concluded that an increase in motor speed preaged the binder sample during the preparation process which led to its increased stiffness. It has to be mentioned that the pre-aging phenomena is undesirable since it will reduce the overall service life of pavements. The application of lower motor speed during blending is highly suggested
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
- …
