1,721,058 research outputs found
Effects of hydrophobic treatment on thermophysical properties of lightweight mortars
No full textThe effects of an innovative hydrophobic treatment and moisture content on thermal conductivity of lightweight mortars were investigated. The aim of this study was to provide data on the insulating properties of the above mentioned mortars, that can be used in engineering practice, once properly processed. Various mortars were prepared by mixing Portland cement and/or lime with different granulated aggregates such as Neapolitan tuff, expanded clay or siliceous standard sand. After a curing time of 28 days, a set of mortars was directly tested in terms of thermal conductivity at different moisture content, comparing the results obtained from the corresponding mortars previously submitted to hydrophobic treatment. Finally, the effects of hydrophobic treatment on other physical properties such as water vapour permeability and capillary rise were also investigated. © 2005 Elsevier Inc. All rights reserved
Eco-compatible protective treatments on an Italian historic mortar (XIV century)
No full textThis paper reports significant results about the effects of repeated treatments to protect a mediaevalItalian mortar from capillarity-absorbed water, by using for the treatments, our no-commercial hydro-alcoholic suspensions of calcium hydroxide nanoparticles (nanolime). The mortars samples came fromthe historical site, where preliminary thermographic inspection were performed to detect the dampzones. Before treatments, the samples were analyzed from a mineralogical and chemical point of view,by means of several techniques, as optical microscopy (OM), thin section observations (PFM), porosimet-ric investigations, X-ray fluorescence (XRF), X-ray diffraction (XRD), infrared spectroscopy (FT-IR) andthermal analysis (TG-DTA). The size-grading curve of the aggregate and the binder/aggregate ratio wereexamined too. Then, the efficacy of nanolime protective treatments on this mortar versus the nanolimeconcentrations was investigated. For this aim, capillarity tests as well as porosimetric investigations,before and after the treatments, were performed. The obtained results were remarkably promising bothin terms of the reduction of water absorbed by capillarity (up to 60%) together with an adequate decreaseof porosity (up to 23%), fixing the protective effect of such eco-friendly and very compatible approach
Application of high-intensity static magnetic field as a strategy to enhance the fertilizing potential of sewage sludge digestate
Full text linkAnaerobic digestion (AD) is a sustainable and well-established option to handle sewage sludge (SS), as it generates a methane-rich biogas and a digestate with potential fertilizing properties. In the past, different strategies have been proposed to enhance the valorization of SS. Among these, the application of a static magnetic field (SMF) has been poorly evaluated. This study aims to determine the effects of a high-intensity SMF (1.5 and 2 T) on the chemical composition of SS anaerobic digestate. Several strategies (i.e., number of magnetization cycles, addition of different sources and quantities of magnesium, and digestate aeration) have been applied to evaluate the possible formation of compounds with valuable fertilizing properties in the digestate. Experimental results showed that by combining different strategies promoting digestate exposure to the magnetic field it is possible to favour the reduction in the liquid phase of NH4+, NO3 - , PO43-, SO42-and Mg2+ concentrations up to 28%, 38%, 34%, 39% and 31%, respectively. The XRD analyses conducted on the solid phase of the same magnetized digestate samples showed an increase in crystalline and amorphous phases of nitrogen and phosphorus compounds with fertilizing value, such as struvite. These results highlight that SMF application can increase the fertilizing potential of sewage sludge digestate and promote its valorization in a sustainable and circular perspective
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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