1,720,999 research outputs found
Tracce e segni di Baldassarre Peruzzi a Volterra
No full textLa famiglia Maffei è una delle casate volterrane più importanti. Mario Maffei (1463-1537) appartiene a questa illustre famiglia, egli ricopre cariche importanti presso la Curia romana.
Nel 1507 papa Giulio II gli affida il coordinamento e la supervisione dei lavori alla Basilica di S. Pietro, in questa occasione conosce direttamente Raffaello e Antonio da Sangallo, le loro botteghe e tramite loro entra in contatto con gli artisti più promettenti del tempo.
Quando Mario decide di ristrutturare la facciata del palazzo in via dei Calzolai a Volterra, di costruire la villa suburbana di San Donnino presso Villamagna e di progettare il sepolcro del fratello umanista in San Lino si circonda di egregi artisti come Baldassarre Peruzzi e Daniele Ricciarelli
Active vibration isolation using an inertial actuator with local force feedback control
No full textThe design of inertial actuators with local force feedback control and their use in active vibration
isolation systems is considered. Unlike reactive actuators, inertial actuators do not need to react off a base
structure and can therefore be directly installed on a vibrating structure. In order to guarantee good
stability margins in the active isolation controller, however, the actuator resonance must have a low natural
frequency and it must be well damped.
The behaviour of an inertial actuator with different local force feedback control schemes is first analysed,
and it is shown that a phase-lag controller has a good stability margin and can effectively damp the
actuator resonance using relatively lowgains, compared with a direct force feedback or integrated force
feedback controller.
A frequency-domain formulation is then used to analyse the stability and performance of an active
isolation system using an inertial actuator with local force feedback control and an outer velocity feedback
control loop. The plant response, from force actuator input to sensor output, is derived in terms of the
mechanical mobilities of the equipment structure being isolated and the vibrating base structure, and the
mechanical impedance of the intervening mount.
An experimental study of active vibration isolation using an inertial actuator with local feedback control
was then carried out. Theory and experiments agree well, demonstrating the effectiveness of the phase-lag
controller. However, the need to have an inertial actuator with a low resonance frequency leads to problems
with static deflections
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
Congenital cytomegalovirus infection in pregnancy: a 5-years experience with a prospective study.
No full textDispelling 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
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