1,721,070 research outputs found
Proceedings of the tenth Conference of the Italian Section of the International Union for the Study of Social Insects (IUSSI).
No full text
Modello per la simulazione dinamica di modalità innovative di controllo della frequenza e analisi dell’evoluzione dell’inerzia
No full textThe energy transition involves a wide spread of renewable generation and a simultaneous reduction of thermoelectric generation, which has been so far a fundamental resource for frequency regulation and for power system inertia. Analyses concerning new flexibility resources, on one hand, and the evolution of inertia, on the other hand, are therefore needed.
The first presented activity concerns the upward transient frequency regulation (i.e. inertial) by wind generation and the ultra-fast regulation by battery storage systems, as stated by the specifications of the operator Terna. The dynamic simulations of perturbations on future scenarios of the Sardinian system showed that the wind inertial regulation improves the frequency transient but, in some initial conditions (e.g.: operating point lying in the linear part of the wind-power characteristics), it is not optimal because it causes further frequency perturbation due to the rotor speed recovery. On the other hand, the battery storage regulation is always of benefit to the system and mitigates the possible perturbation due to the wind units recovery.
The second activity describes the evolution of system inertia and analyses the time profile of an index concerning the inertial amount per unit of generated power in a year 2030 scenario. in relation to the evolution of the energy mix. The activity is preliminary to future studies concerning the influence of the inertia spatial distribution on frequency stability
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
Valutazioni sulla stabilità di frequenza e sui requisiti di inerzia e potenza di cortocircuito nel sistema elettrico italiano: modelli e strumenti integrati
Full text linkThe energy transition involves a widespread adoption of renewable generation and the simultaneous reduction of thermoelectric generation. This implies a decrease in the resources for frequency regulation, inertia and short-circuit power, to be compensated by other resources and solutions. Adequacy assessment of the flexibility resources for power system stability is therefore essential. The report presents three
activities about this topic.
The first activity concerns the updating of a tool aimed at the mono-zone (based on one-busbar equivalent) adequacy assessment of resources for conventional (“slow”: primary, secondary and tertiary) frequency regulation and for short-circuit power provision. The tool has been updated for multizonal analyses of the active power reserve and has been prepared for multizonal developments concerning the short-circuit power. The application to a 2030 national scenario has shown potential criticalities in the fulfilment of secondary and tertiary reserve requirements, related to the scarcity of thermoelectric generation on the basis of significant decarbonization assumptions.
The second activity concerns the evolution of the “SeTA” procedure (Innovative Services: Automatic Tuning) for the optimization of ultra-fast frequency regulation services. A new iterative approach has been implemented to improve the accuracy in identifying equivalent output-error models of the electrical system which are used for sizing the necessary regulating quantities. The new approach considers, already in the identification phase, the contribution of innovative regulations. Application to a 2030 Sardinian scenario highlights that fast-primary regulation is essential. A contribution of synthetic inertia proves necessary in case of non-implementation of the three new synchronous compensators that are indeed planned.
The third activity concerns the definition of specifications for a platform dedicated to the integrated analysis of slow and ultra-fast frequency regulation resources. Considering the developments achieved in the calculation procedures described above, automating the acquisition of the market simulation results, preliminary to the flexibility analyses, is deemed a priority
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
- …
