1,721,091 research outputs found
HVAC systems testing and check: a simplified model to predict thermal comfort conditions in moderate environments
Full text linkAbstract: A simplified approach to thermal comfort was developed in Seventies by Rohles, who found
a correlation between PMV, air temperature and relative humidity, easily sampled in the environment
(for sedentary activity and clothing thermal insulation < 0.5 clo). In the present paper an improvement
of the Rohles model was tried, in order to generalize results in a wider range of clothing thermal
insulation (Icl = 0 - 1.65 clo). Instrumental and questionnaire data available from wide experimental
campaigns carried out by the Authors in classrooms and open space offices were used to implement a
simplified model for the PMV calculation based only on air temperature an relative humidity
measurement. Instrumental data were implemented in a new model by means of a function PMV =
PMV(T, RH) and diagrams PMV versus temperature, for different values of relative humidity, were
traced. A total number of 9 equations and diagrams was obtained (for Male, Female and Both, and for
three ranges of Icl). The standard deviation between measured and calculated data was also evaluated
and a mean error on PMV of ±0.22 was found. Questionnaire results were elaborated in the same way,
but no good results were obtained, therefore an approach with Neural Network could be tried in the
future
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
Assessment of the Performance of Road Markings in Urban Areas: the Outcomes of the CIVITAS REINASSANCE Project
No full textIn the framework of the EU funded CIVITAS plus RENAISSANCE project, a research activity was focused on
the definition of a new methodology for evaluating the global quality of the road markings at urban level, both from a
technical and an economic point of view, in order to assure road safety.
Two innovative indicators were developed: one for the assessment of the technical performance (CIS-Q) and one for the optimization of the budget (CIS-C).
In order to rate the global quality of municipal road markings, the performance indicator CIS-Q takes into account all the
parameters characterizing the performance of road markings, such as luminance coefficient in day conditions Qd,
retroreflectivity in night conditions RL (dry, wet), skid resistance SRT, colour, kind of material and ageing of the
pavement markings, traffic volumes, characteristics of road surface and average local weather conditions.
The economic indicator CIS-C considers the budget available for the road manager and compares it with the one needed
to ensure an adequate level of quality for road markings
Adaptive analysis of thermal comfort in university classrooms: correlation between experimental data and mathematical models
Full text linkNumerous studies are in progress to support adaptive models and to establish quantitative indexes to allow the subject to optimize his comfort conditions. With the aim of finding possible correlations between experimental data and experimental surveys for moderate environments, such as university classrooms, a multiple response questionnaire was elaborated, comprehensive of information for the static and adaptive model proposed by UNI-EN-ISO 10551. The questionnaire was applied in autumn, winter and spring in classrooms of the University of Perugia, Pavia and Terni. During the campaign, all data needed to calculate both Fanger and Wray comfort indices were acquired by instrumental surveys and questionnaire compilation. By means of results analysis the following couple of parameters were correlated: Predicted Mean Vote (PMV) versus the difference between the Equivalent Uniform Temperature and the Comfort Uniform Temperature (Teu - Tu) and the Predicted Percentage of Dissatisfied (PPD) versus the absolute value of the same difference between temperatures (|Teu - Tu|). For the first couple of parameters a linear correlation was found while for the second one a second degree polynomial relation was obtained. Finally values of Operative Temperature T0 and Equivalent Uniform Temperature Teu, obtained for each single experimental survey were compared, observing a very good agreement between the two quantities, with differences that exceed 0.1 K only for a few number of values
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