1,720,969 research outputs found
Experimental evaluation of the sound absorption and insulation of an innovative coating through different testing methods
Full text linkThe Uncertainty Declaration of Building Acoustics Measurements: How to Select the Uncertainty of Reproducibility from Inter-Laboratory Tests
No full textThis paper deals with the standard deviation of reproducibility obtained from multiple Inter-Laboratory Tests (ILTs), whose average values were standardized in ISO 12999-1. The reproducibility obtained in this way is intended to be used for the declaration of uncertainty in test reports of building acoustics measurements. Therefore it is necessary that the declared uncertainty be representative of all the specimens, or products, that could be tested. This paper demonstrates that the new standard deviation σR95, introduced for the first time in ISO 12999-1, leads to an overcoverage with respect to the desired 95% coverage probability. Moreover, two other methods are presented, the former based on a Bayesian analysis and the latter on random variance and fixed mean, to demonstrate that the reproducibility standard deviation σR, where the reproducibility variance σ2 R is the mean value of the variances of all the ILTs included in ISO 12999-1, is the natural choice for the declaration of uncertainty
ETICS measurements and prediction - Verification and validation of a predictive model for the improvement of airborne sound insulation of thick external linings
No full textThe increasing demand of the reduction of carbon emissions and the consumption of energy
resources due to the construction sector leads to the concept of Zero-Energy buildings. It is
therefore crucial ensuring technical and engineering compatibility between future advancements
in energy efficiency and sound insulation. The sound insulation requirements for residential
buildings are mandatory in Italian Regulations, tested on-site after construction completion. A
noteworthy challenge is the potential synergy between specifications for energy efficiency and
sound insulation properties in building materials.
This paper deals with the validation of the prediction model for the improvement of airborne
sound insulation due to thick external linings, particularly materials used in ETICS (External
Thermal Insulation System), based on mechanical properties of involved materials. Standard ISO
9052-1 for the determination of dynamic stiffness is intended for materials used under floating
floors in dwellings. However, based on the methods of this standard, it is possible to perform
measurements (with both hammer and shaker) even on thick linings materials and use the results
for the implementation of computational models for the predictions of improvement of sound
reduction index, as a function of frequency, with good accuracy
Sperimentazione su materiali di rivestimento innovativi, aventi elevate caratteristiche acustiche, da utilizzare per il risanamento di edifici
No full textLa sperimentazione ha avuto come scopo l'individuazione di un materiale innovativo per rivestimento di pareti, con elevate caratteristiche acustiche e termiche, da utilizzare in aree urbane densamente abitate e caratterizzate da forte inquinamento acustico. Sono stati selezionati tre materiali, i quali sono stati sottoposti a prove di isolamento e assorbimento acustico
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
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