1,721,041 research outputs found
Miglioramento delle prestazioni di materiali cementizi capaci di ridurre la concentrazione di gas serra
No full textProject Coordinator: Francesca Tittarelli - UdR Università Politecnica delle Marche, Local Coordinator: Luca Bertolini - UdR Milano Politecnic
Effect of Biomass Waste Materials as Unconventional Aggregates in Multifunctional Mortars for Indoor Application
No full textAbstractIn order to decrease energy consumption in buildings, a new way to recycle materials coming from biomasses waste in mortars was studied. For this purpose, mortars with water/cement equal to 0.5 by weight and aggregate/cement equal to 3.5 by volume were considered. Cement was replaced by hydraulic lime and sand was substituted with two different types of spruce sawdust shavings (as it is and roasted), biomass bottom ash and biomass fly ash. The results show that mortar prepared with cement has obviously a better mechanical strength and 60% lower capillary water absorption. All unconventional aggregates increase the total porosity of lime mortars. Moreover, biomass fly ash and both spruce sawdust shavings based mortars can be classified as lightweight mortar. Regardless of porosity and lightness, biomass bottom ash improves up to 150% the mechanical performance of lime-based mortars. Concerning durability, bio-based lime mortars show in general nearly twice higher capillary water absorption with respect to the sand lime mortars whit the exception of spruce sawdust shavings and biomass bottom ash. Mortars can be classified as permeable to water vapour. As it is and roasted spruce sawdust shavings are able to increase three and two times the capacity of the mortar to be a hygroscopic buffer in terms of MBV values
Corrosion behavior of reinforced no-fines concrete
No full textThe CO2 induced corrosion behavior of no-fines concrete manufactured with three different strength classes
and reinforcements is compared. The main results showed that black steel corrodes with rates three
times higher with respect to those monitored in the other reinforcements, with higher corrosion rates in
lower strength class concretes. The corrosion rates of steel covered by cement grout and galvanized reinforcements
are not affected by concrete strength class since they protect themselves with the cement
grout coating or zinc passivation, respectively. Among the reinforcements considered in this work, galvanized
steel shows the best corrosion behavior
Improving the Impact of Commercial Paint on Indoor Air Quality by Using Highly Porous Fillers
No full textAbstract: In the current paper, the effect on Indoor Air Quality (IAQ) of two commercial acrylic-based
paints were compared: one (Paint A) for indoor applications, the other (Paint B) for indoor/outdoor
applications. Both were applied on an inert and on a real mortar substrate. The possibility of Paint B
to passively improve IAQ was also investigated when adding highly porous adsorbent fillers, both as
addition or as total replacement of a conventional siliceous one. The obtained results show that all
paints have high capacity to inhibit biological growth. Paint A is more breathable and it has a higher
moisture buffering capacity. Paint B negatively modifies the beneficial properties of the mortar
substrate for IAQ. However, the use of unconventional fillers, especially as addition to the formulation,
allows the recovery of the same properties of the substrate or even the enhancement of about 20% of
the ability to adsorb volatile organic compounds (VOCs) under the current test conditions
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
- …
