1,720,966 research outputs found
Application of the Mixed Linearized Exergoeconomic (MILE) method with evolutionary optimization to a cogeneration and district heating system
No full textThe paper presents a development of the Mixed Integer Linearized Exergoeconomic (MILE) optimization
method, proposed in 2010. The method is based on an improvement of the original Fuel Impact Relation,
proposed in the ambit of Thermoeconomics, where on-off operation and presence-absence of components
can be modelled by means of binary decision variables and inequality constraints. In particular, the
introduction of binary decision variables allows the synthesis and the operation of an energy system to be
optimized at the same time. In this new development, an evolutionary algorithm is used at the higher
optimization level, to choose the main binary decision variables, whilst a MILP algorithm is used at the lower
level, to choose the optimal operation of the system and to supply the merit function to the Evolutionary
algorithm. The method is then applied to a distributed generation system, which has to be designed for a set
of users located in the centre of a small town in the North-East of Italy. The results show the advantage of
distributed cogeneration, when the optimal synthesis and operation of the whole system are adopted, and an
important reduction in the computing time by using the proposed bi-level optimization procedure, with
respect to the direct implementation of the whole problem in a single level MILP solver
Effect of Different Economic Support Policies on the Optimal Definition and Operation of a CHP and RES Distributed Generation Systems
No full textThis paper deals about the application of MILP
for economic optimization of complex cogenerative
systems. In particular, it optimizes both the size and
operating strategy of CHP systems and the lay-out of
micro district heating networks applied to a urban
contest. The proposed model considers the possible
adoption of a set of micro-cogeneration gas turbines
located in different buildings, and of a centralized
cogeneration system thus allowing part of the required
thermal energy to be produced in a single site. In
addition, thermal and photovoltaic panels can be
integrated into the system to improve thermal and
electrical energy production, respectively. Each site
can be connected to the others through district heating
micro-grids. Hence thermal energy can be distributed
inside the system.
A further objective of the paper is to evaluate the
effect of different economic support policies on the
optimal solution, and to relate the economic effort
implied in each support policy with the expected
results in terms of CO2 emissions reduction and
primary energy savings
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
The Thermoeconomic Environment Cost Indicator (iex-TEE) as a One-Dimensional Measure of Resource Sustainability
No full textThis paper presents a conceptual development of sustainability evaluation, through an exergy-based indicator, by using the new concept of the Thermoeconomic Environment (TEE). The exergy-based accounting methods here considered as a background are Extended Exergy Accounting (EEA), which can be used to quantify the exergy cost of externalities like labor, monetary inputs, and pollutants, and Cumulative Exergy Consumption (CExC), which can be used to quantify the consumption of primary resources embodied in a final product or service. The new concept of bioresource stock replacement cost is presented, highlighting how the framework of the TEE offers an option for evaluating the exergy cost of products of biological systems. This sustainability indicator is defined based on the exergy cost of all resources directly and indirectly consumed by the system, the equivalent exergy cost of all externalities implied in the production process and the exergy cost of the final product
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