1,720,972 research outputs found
Energy performance assessment of solar-assisted desiccant cooling system
No full textSolar systems have the main purpose of replacing fossil fuel based systems so as to attain a primary energy saving. In this context, the recourse to solar-assisted air conditioning systems in buildings represents a suitable choice not only to reduce the final energy consumptions but also to enlarge the utilization field of solar thermal energy. On the other hand, different technical solutions can be profitably employed. Among these, desiccant cooling systems (DEC) represent an interesting option to be investigated. Aim of this work is to assess the potential of solar-assisted air conditioning systems based on a desiccant cooling cycle which regenerating heat is supplied by low temperature solar thermal collectors.
In the present study a comparative analysis, based on an energy saving approach by comparison with an electrically driven vapour compression heat pump (assumed as reference convectional cooling and heating machine), has been carried out. In order to assess the energy performance of the solar-assisted desiccant cooling system, different plant configurations have been investigated by means of suitable TRNSYS simulation models. The analysis has been performed for a typical residential building (a terraced house) located in Palermo, whose heating and cooling loads have been estimated by means of EnergyPlus simulation program and used in TRNSYS as input file. Concerning DEC system, both recirculation and ventilation modes have been examined. The regeneration heat has been supplied by a water heater solar system powered by evacuated tubular collectors and assisted by an in line air-heater. An apposite control strategy, based on both the control of inlet humidity and the following of regeneration temperature, has been implemented. For all the considered configurations, thermal COP (evaluated as the ratio between the cooling capacity and the regeneration heat), consumed primary energy and solar fractions (evaluated on monthly and annual basis) have been calculated.
From the results obtained, a techno-economic comparison, relevant to other thermally driven air conditioning systems (single and double effect absorption chillers using water/LiBr, advanced cycles using ammonia/water and adsorption chillers), has been carried out. This in order to assess the energy and the cost effectiveness of DEC systems compared with other solar-assisted technologies.
The obtained results show the capacity of these systems to reduce significantly the primary energy consumption. On the other hand, some open questions remain: the cost-effectiveness compared to reference conventional heating/cooling systems and the assessment of how the electrical energy consumption (due to high air flow rates and large pressure drops) could affects (affect) the overall primary energy saving
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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