1,720,993 research outputs found
Development of a Wind Tunnel Model for Supporting Research on Aero-Servo-Elasticity and Control of Wind Turbines
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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
Sviluppo di un sistema di controllo real-time per un modello di aerogeneratore in galleria del vento
Get PDFLAUREA SPECIALISTICAIn questo elaborato di tesi si presenterà lo sviluppo di un sistema di controllo
real-time per un modello di aerogeneratore da utilizzare in galleria del vento. Il
lavoro fa parte di un progetto triennale e si inserisce in una fase in cui il l’apparato
meccanico è già stato definito e realizzato.
In particolare, si discuterà della configurazione degli attuatori da utilizzare per
il controllo del sistema e individuati in una fase precedente del progetto, nonché le
modalità di comunicazione e funzionamento in un ambiente real-time.
Si analizzerà successivamente il metodo di funzionamento di un vero aerogene-
ratore, in particolare la logica della macchina agli stati che ne gestisce il controllo,
riproponendo una soluzione per il modello scalato; si evidenzieranno nel dettaglio
le differenze tra gli stati delle due macchine, i punti in comune e si discuterà della
necessità di aggiungere delle modalità che permettano il tracciamento delle curve
prestazionali per validare il modello in galleria del vento.
Una volta definita la logica di controllo e supervisione se ne studierà quindi
l’implementazione in RTAI, un applicativo real-time opensource sviluppato al Po-
litecnico di Milano, e se ne discuteranno i differenti aspetti legati alla sua configu-
razione e al suo utilizzo, i punti di forza e le criticità; se ne costruirà quindi una
realizzazione preliminare che permetterà di valutare il buon funzionamento della
componentistica meccanica, degli attuatori e della logica di controllo.
Si analizzerà in seguito un prodotto industriale utilizzato sui veri aerogenera-
tori, il sistema Bachmann, studiandone l’adattabilità al modello scalato e con-
frontandone le possibilità di sviluppo e le capacità operative con quelle offerte da
RTAI.
Si vedrà infine l’utilizzo del modello scalato in galleria del vento con la solu-
zione real-time sviluppata, evidenziando la programmazione delle prove, i risultati
operativi ottenuti e le criticità rilevate.In this report it will be presented the development of a real-time control system for
a wind turbine model to be used in a wind tunnel. This work is a part of a three
years pro ject and takes place when the mechanical parts has been already defined
and realised.
It will be discussed the actuators configuration to be used to control the system,
actuators already chosen in earlier phase of the pro ject, and the communication
and operating modes in a real time environment.
Then it will be analysed how a real wind turbine works, focusing on the state
machine logic that runs on-board, and studying a new solution for the scaled model;
it will be highlight the differences between the states of the real wind turbine and
the scaled mode, the common aspects, and it will emerge the needs to add some
functionalitys to run the model in order to make the pro ject data validation tests
in the wind tunnel.
Ones the control logic has been defined, it will be studied his implementation
in RTAI, an open-source real time pro ject developed at Politecnico di Milano,
and it will be discussed the different aspects about his configuration and use, the
advantages of the system and the his criticalities. A preliminary realisation will be
constructed in order to evaluate the good behaviour of the mechanical parts , the
actuators and the control logic.
It will be later analysed an industrial product used on the real wind turbines,
the Bachmann system, making a study about the possibility to use it with the
scaled model and making a comparison with RTAI’s development possibilities and
capabilitys.
Finally it will be shown the developed real time solution behaviour in the wind
tunnel, highlighting the tests organisation, the operative results and the criticalities
detected
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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