1,721,000 research outputs found
On liquid transport coefficients in materials where liquid water is not present
No full textA common way to describe moisture transport in materials is to include one term in the flux equation for "liquid flow", that has moisture content as the transport potential. The transport coefficient, the diffusivity, is usually expressed as a monotonously increasing function of moisture content or RH. This is discussed in the paper and shown to be a crude over-simplification. Contradicting examples are taken from literature and comparisons are made with moisture profile measurements in two cases with temperature gradients in wood and in concrete.Presenters:
name: Lars-Olof Nilsson
affiliation: (Lund University)
email: [email protected]
Training for Moisture Specialists
No full textFuktcentrum, an interest group of researchers working in the field of moisture in Sweden, offers training for moisture specialists. The purpose of the training is to meet the needs of society through the new building regulations BBR 2007, requesting a more thorough way of working with moisture safety issues in the building process. The training is meant for people working actively in the building process. The training is arranged as five two-day pass focusing on different subjects: Moisture theory, moisture critical structures and components, moisture safety in the building process, moisture rounds, moisture calculations, moisture safety design and moisture measurements and control. After each training occasion, a task corresponding to 3 days work is given as home work. To be able to hold the course at a high educational level, the previous knowledge of the candidate is tested through a diagnostic test before start of the training. Finally, the knowledge will be tested through a written exam. The training was first offered during the autumn 2007, altering between LTH Lund University and SP Swedish Technical Research Institute. At this point about 30 persons has been following the training and will hopefully be holding a diploma in the end of the year. Responsible for the training are: Lars-Olof Nilsson, LTH Kristina Mjörnell, SP Lars-Erik Harderup, LTHPresenters:
name: Kristina Mjörnell
affiliation: (Researcher)
email: [email protected]
name: Lars-Olof Nilsson
affiliation: (Professor)
email: [email protected]
Laboratory models for the assessment of the effectiveness of chemical damp-proofing in masonry: existing methods and some proposals for new fixtures
No full textCoping with rising damp in existing masonry is extremely complex due to several reasons, such as the presence of architectural constrictions, the variability of ancient materials and technologies and the difficulty of monitoring moisture in a quantitative and accurate manner. For this reason, investigating the effectiveness of the different repair systems at a laboratory scale may greatly contribute to a better understanding of the functioning of such systems and to their improvement.
In the case of chemical damp-proofing, some methods have been proposed in the literature and by national Institutions, but the approach followed by these methods are very different and not homogeneous.
In the present paper, a review of the methods for the assessment of the performance of chemical damp-proofing by use of laboratory models is carried out, highlighting their strong points and drawbacks.
Then, two new kinds of masonry models, characterised by different geometry and size, are proposed, allowing the reproduction of rising damp occurrence in the laboratory. Some preliminary results are shown about their employment for the monitoring of rising damp, also highlighting some critical aspects connected to their conditioning
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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