1,720,978 research outputs found
Experimental Characterization of High Performance WAM-Foam Trial Sections
No full textThis study aims to evaluate the feasibility of using warm asphalt mixes for high performance pavements on the basis of a complete mixture characterization. In this work WAM Foam technology is studied by introducing a soft binder and a hard foamed bitumen at different stages during mixing. This results in lower production temperatures which is beneficial both in terms of energy consumption and air emissions. By proper selection of the two binders, a high-performance mixture was produced (Greenfalt®) which was used on a heavy trafficked high-speed road in Italy. The paper describes results of tests that were carried out on laboratory and field compacted specimens taken from experimental trial sections as well as results of Falling Weight Deflectometer (FWD) tests carried out on the same sections. The results show good performance in terms of stiffness, fatigue life and resistance to permanent deformation
Manufacturing reclaimed asphalt test specimens using gyratory compactor
No full textThis paper presents a laboratory investigation aiming to provide a protocol that
allows to confidently using gyratory compaction for the production of reclaimed asphalt test
specimens. The presented investigation is part of a wider experimental programme aiming at
obtaining input parameters for modelling purposes. For this reason, it has been necessary to
define a quick and reliable and repeatable procedure to manufacture a high number of
specimens with a limited amount of material. Gyratory specimens were compacted by
targeting to densities defined in previous Marshall mix design and with the final aim of
obtaining specimens with a fixed and homogeneous distribution of air voids content. The
study has been developed by comparing results of two Stone Mastic Asphalt mixtures, a
control mix with virgin material and a reclaimed asphalt mix with 30% of RA. The mixtures
had almost identical air void contents, aggregate grading curves and the binders had similar
conventional binder properties. Homogeneity of air void distribution was investigated by X-ray
Computed Tomography (CT), image analysis techniques and buoyancy tests. Coring and
trimming of the compacted specimens were used to obtain the final test specimens with fixed
homogeneous properties. The study concluded that gyratory compaction is suitable to
produce homogeneous test specimens also for mixtures containing high amount of reclaimed
asphalt. Nevertheless final coring and trimming of the specimens are mandatory as well as
performing a preliminary investigation for each material consisting in the compaction, and the
further buoyancy tests, of few specimens having densities ranging from 100 to 90% of the
initial target. The presence of high percentage of RA did not present remarkable issues apart
making the compaction harder. This study has been developed within the FP7 European
Project Re-Road
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Fundamental characterisation of reclaimed asphalts: the importance of testing homogeneous specimens
Get PDFThis study highlights the importance of defining appropriate specimen manufacturing procedures when assessing the fundamental properties of reclaimed asphalt mixes for further modelling purposes. Two gyratory compactor procedures were used: the first leading to specimens with a non-uniform air voids distribution and the second tailored to obtain homogeneous specimens. The study was performed by using three SMAs incorporating up to 30% of reclaimed asphalt but designed to have identical properties. A detailed characterisation of the loose mixes and binders, a X-Ray CT micro-structural study of the manufactured specimens and a further mechanical characterisation showed that testing nonhomogeneous gyratory specimens leads to a significant overestimation of the mechanical properties of asphalt mixes. This study has been developed within the FP7 project ReRoad
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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