1,720,975 research outputs found
Il ceto imprenditoriale nel primo decennio repubblicano. Anticipazioni su un campione di ricerca
No full textFerratini Tosi F., Grassi G., Legnani M., Maffeis M., Pirzio P., Zancanaro A. Il ceto imprenditoriale nel primo decennio repubblicano. Anticipazioni su un campione di ricerca. In: Mélanges de l'Ecole française de Rome. Moyen-Age, Temps modernes, tome 95, n°2. 1983. pp. 165-181
Engineered calculation of the uneven in-plane temperatures in Insulating Glass Units for structural design
No full textInsulated Glazed Units (IGUs) are composite elements formed by two or more glass panes held together by structural edge seals, entrapping a gas for thermal and acoustic insulation. There is a wealth of evidence that they are prone to cracking due to an uneven temperature distribution within each glass pane, caused in particular by solar radiation, enhanced by the shielding of contour-frame and cast shadows. The accurate assessment of the temperature field in the glass is the input datum to calculate the thermal strain and the consequent state of stress. An engineered method for calculating the temperature field in the glass panes of multiple IGUs, of arbitrary composition, is developed here. This method considers the various sources of thermal exchange: conduction between the exposed, shadowed and border regions of each pane, convection and radiation with the surrounding environment and between the panes, heat storage. Proper coefficients are defined for multiple reflective phenomena of radiant energy between the various glass layers. The proposed model is applied to explanatory case studies, accounting for the daily variations of the external temperature and solar radiation
Enhanced engineered calculation of the temperature distribution in architectural glazing exposed to solar radiation
No full textThe precise assessment of the temperature distribution on glass panes, whether they are single windows or façade components, is of paramount importance for the safety and durability of building skins, because many experienced breakages are due to the thermal stress resulting from solar radiation. Here, an enhanced engineered method for the calculation of the temperature field in the panel is presented, which takes into account the different heat exchange phenomena that influence the temperature distribution. The possible presence of shadows and of a contouring frame is considered by dividing the panel in regions considered to be thermally homogenous and, for each region, the time-dependent temperature is evaluated by establishing a transient energy balance. The proposed model is compared, both from a qualitative and a quantitave point of view, with the formulations of current Standards and design rules. Paradigmatic case studies are considered, taking into account the daily and seasonal variations of the external temperature and solar radiation. The effects of the size and shape of the shaded regions are also investigated in a parametric analysis. Once the temperature distribution is known, the stress state in the glass can be readily calculated with most commercial FEM codes
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
Engineered modelling of the soft-body impact test on glazed surfaces
No full textThere is an increasing need to define the capacity of glazed surfaces under impulsive dynamic actions, such as those transmitted by a soft-body impactor as required by new regulations. The dynamic problem is first analyzed with a simple approach based upon an equivalent linear and non-linear 2-DOF system. The time-history analysis is complemented with energetic considerations that, with reasonable assumptions, can directly provide the maximum stress in the panel through the definition of an equivalent static load. Furthermore, an advanced FEM tool has been developed, which uses non-linear unilateral beam elements available in the library of a commercial software for structural analysis and, therefore, has a wide range of applicability. The comparison of the predictions from the proposed methods with results obtained from experiments and other advanced software, indicates the accuracy of the proposed approaches and their range of applicability
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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