1,721,061 research outputs found
Small-scale biomass power plant for distributed energy generation
Full text linkNowadays concern about climate change is gaining more importance not only in the scientific community but also in the public opinion, which is pushing for having policies oriented to encourage the use and the development of renewable energies. In order to contribute to the spreading and evolution of renewable energy, the approach to the distribution of the energy is changed from centralized to distributed generation (DG). In this frame, Combined Heat and Power (CHP) systems are becoming crucial, thanks to their capability to satisfy at the same time heat and power demand with a relatively high efficiency. One of the main advantages of these new solutions is that they can give a boost to the spreading of renewables and developments of green technologies. However, the selection and installation of the best performing renewable plants is never trivial due to the inherently intermittent nature of some renewables (as wind or solar energy) and so, their need to be integrated with energy storage and programmable generation systems in order to match energy demand. This thesis deals with the integration of energy produced by biomass, mainly woody, with other small-scale power plants, such as Organic Rankine Cycle (ORC), and Thermal Energy Storage (TES), in a DG approach that exploits cogeneration to reduce energy waste. Two different scenarios are the main line of the following work: a hybrid plant, where biomass integrates solar energy, and a pure biomass boiler fed system, where the biomass supply heat to different power generations technologies. Tools such as optimization algorithms and thermo-economics analysis have been used to quantify the 7 effect of some of the many variables on the efficiency and profitability of such systems. In the hybrid biomass-solar plant case, the effect of coupling this system with an external combustion gas turbine is analayzed. The turbine is fed by biomass to overcome the main limits of solar energy, i.e. energy intermittence. The coupling between the two systems is done by means of a TES that receives heat from both systems. In turn, the TES transfers heat to an ORC, which will be the element that supplies energy to the end-user. Concerning this layout, the performances, the effects of the use of different organic fluids in the plant ORC and the variation in economic profitability depending on the geographical location of the plant are analyzed. The second case analyzes different layouts all with a biomass boiler. The furnace is here coupled with systems such as TES, steam plants and ORC in different configurations. Real input data from a biomass boiler installation and heat demand have been applied to the systems. The analysis has been performed by implementing hourly energy costs and electricity feed-in tariff. The aim is to evaluate the effect of TES and/or ORC installation in a biomass system and eventually select the best performing size and operating conditions of the plant components. The two studies highlight that, in general, (i) coupling the biomass boiler with a TES allows the boiler to work at higher part-load conditions and at a higher global energy efficiency; (ii) profitability of ORC installation could increase with flexible plant, where the heat demand is satisfied also by the other component such as a TES: in this case, a smaller ORC size could be selected, increasing equivalent operating hours and reducing investment costs; (iii) investment profitability increases in the presence of a dedicated subsidy framework such as the one available in the Italian energy market. The future steps of this research will focus on the quantification of the techno-economic 8 advantages of the proposed system configurations in terms of higher generation flexibility and implementation of demand response strategies
Corporate Responsibility and non Financial Reporting in the Banking Sector: Analysis and Critical Issues
No full textNo abstract availabl
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
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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