1,720,976 research outputs found
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
Detailed design of heat exchangers in matlab for organic rankine cycle applications
No full textConsulta en la Biblioteca ETSI Industriales (Riunet)[EN] The use of Organic Rankine Cycles (ORC) is increasing due to the high thermal
efficiency that can be reached compared to a water-driven Rankine Cycle (RC) for low
temperature heat sources. Besides, a good organic working fluid must have good safety
characteristics as non-toxic and non-flammable, low environmental impacts, low cost,
good availability, etc. There exits different types of organic fluids like hydrocarbons, hydrochlorofluorocarbons,
hydrofluorocarbons and chlorofluorcarbons.
In this present study, MATLAB models for heat exchangers with ORCs were developed.
An existing MATLAB code for basic engineering applications was extended with
correlations for pressure drop calculations, heat exchanger geometry etc. The final design
was verified by ASPEN PLUS simulations.
Several simulations were carried out in MATLAB and compared to real data from
a geothermal power plant. In these simulations, different correlations for pressure drops
and heat transfer coefficients were used. Two types of heat exchangers have been designed:
a preheater or economizer and an evaporator. After MATLAB simulations have
been taken placed, ASPEN simulations were verified. Finally, different working fluids were
simulated MATLAB models. These MATLAB models were chosen from a comparison between
MATLAB and ASPEN models.
The existing MATLAB code has been optimized including new correlations. Results
obtained from MATLAB models are good approximations to real data. The errors
between MATLAB simulations and real data are between reasonable ranges. Finally, simulations
with other working fluids were carried out in order to verify the applicability of the
derived model for different systems.Gonzalez Megias, R. (2015). Detailed design of heat exchangers in matlab for organic rankine cycle applications. https://riunet.upv.es/handle/10251/51674.Archivo delegad
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
Kraftwerksverbund zur Deckung des Strom- und Wärme-bedarfs auf Basis erneuerbarer Energien
No full textConsulta en la Biblioteca ETSI Industriales (Riunet)[EN] The need to meet the energy demand of the world through alternative energy sources (solar, wind, biomass, etc) due to of the reduction of conventional sources (oil, coal, etc) can lead to the reconstruction of the power plant network. In this new energy mix, different types of power plants are to be incorporated, and the coverage of electricity and heat demand must always be secure at minimal cost, even in special cases or peak loads situations. In addition, climate objectives of the Federal Government must be considered. Hence, in this work, concepts are developed in which an optimal distribution of electricity and heat generation from each plant to meet demand can be car-ried out.
To accomplish this, cost correlations that take into account both fixed costs of equipment and operating costs are developed. Due to the lack of opportunities for validation, scenarios based on the calculated cost are analyzed using an optimization algorithm to confirm the validity of the model implemented. Cash flow diagrams are created with the aim of determining the profitability of investments and comparing that of the different power plants.López Salcedo, A. (2015). Kraftwerksverbund zur Deckung des Strom- und Wärme-bedarfs auf Basis erneuerbarer Energien. https://riunet.upv.es/handle/10251/48698.Archivo delegad
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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