1,721,091 research outputs found
Experimental plant for testing R22 `ozone-safe' substitutes behavior in heat exchangers
No full textAn apparatus, accomplished to carry out an energetic performance comparative evaluation of R22 and its alternative working fluids, is presented. In detail, heat exchangers performances will be evaluated when the plant runs with alternative fluids. At this moment it has been verified that the experimental rig works as designed with R22 and therefore that it is ready to test the new refrigerants
Actual performance of an R502 alternative working fluid
No full textIn the paper a pilot plant built to evaluate the comparative performances of R502 and its alternatives, is presented. Then, the first experimental results on R403B (ISCEON 69L, Rhone-Poulenc), obtained with evaporating temperatures around -35 °C are presented and discussed
Let us sow the seed of awareness: Ideals vs ideologies
Full text linkThis contingent historical period is characterized by a strong dichotomy: the difficulty of programming and planning the future due to the immanence of the pandemic crisis and the impetus towards innovation in the political world that offers effective instruments to think about production sectors in an eco-oriented key. We will ask Filippo de Rossi, responsible for editing the National Research Programme – NRP 2021-2027 of the Ministry of University and Research about his point of view, his recipe, his secret ingredient so that the world of Research in the construction sector can make a real ecological transition thanks to which an effective strategy for the development of new paradigms, a multi-perspective of Research can be implemented
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
Analysis of some recharge solutions on varying the R407C composition
No full textIn the vapour compression plants possible leaks can vary the composition of a zeotropic refrigerant mixture. The main aim of this paper is to verify experimentally if the plant performances are restored with a proper recharge, when leaks are imposed. As for the R407C mixture the percentage of the less volatile component (R134a) increases, while the percentage of the more volatile components (R32 and R125) decreases when leaks occur. The experimental tests have been realized determining refrigerant leaks from the liquid receiver placed at the condenser outlet and measuring the properties in steady state condition. The recharge is realized in different ways: with R407C, with R134a and R410A or with R32 R125 and R134a. The different solutions are then compared from the economical point of view, in terms of COP, refrigeration power and air temperature at the evaporator outlet, adopting an iteration method. This method determines the real composition of a zeotropic mixture working in a compression plant, when only the temperature and pressure values at the expansion valve inlet and outlet are known
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
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