1,720,962 research outputs found
Evaluation of Acoustic Comfort and Sound Energy Transmission in a Yacht
Full text linkAfter being neglected for a long time, in the last years, ships have been recognized and studied as sound emitters. The sound energy they generate impacts the outside, but it can also affect the indoor quality of life if the environments are not properly designed. In fact, acoustic comfort plays a pivotal role, particularly in recreational crafts. In the present work, room acoustics and acoustic camera measurements were performed, inside a 50 m length overall yacht, chosen as a case study in order to evaluate the acoustic comfort. The Italian classification procedure UNI 11367:2010 for buildings was applied, and results have been compared to other international comfort classes. However, all of these are based on prescription for standard buildings, and the present work highlights that they do not account for the effective ship’s acoustic issues: sound energy transfer from impacts over ceilings and sound energy leakage. While attention of shipbuilders in acoustic comfort is shown in the measured good reverberation times, the acoustic camera revealed sound energy leakages corresponding to hidden escape ways that have been poorly insulated. This compromises the standardized sound difference between contiguous compartments and also the thermal insulation, as leakage involves air passages. The present work attempts to evolve the classification procedure by also including, for the first time, the reverberation time, but future studies focused on finding correct standardized impact level noise for ship cases are needed. In fact, their values were very high and not comparable with those measured in actual buildings and for which reference values have been designed
ACOUSTIC COMFORT IN YACHTS: MEASUREMENTS WITH ACOUSTIC CAMERA
No full textShipowners have become more sensitive to noise issues, leading to consider acoustic comfort as an important parameter in the design of private boats. In the last years, manufacturers have been requested more attention to the living environments of leisure ships. Especially for luxury vessels, it has been seen that only the respect of the acoustic limits for the health safety of the crew, does not imply a good quality of life on board. Some naval country agencies have developed criteria based on the acoustic indexes used for the buildings, having in mind the different scopes of the various environments. Unfortunately, a common international line has still not been defined. The present work reports the analysis of data acquired with an acoustic camera in the process of the acoustic comfort evaluation of a 50 m long yacht. Due to the cabins' dimensions, the measurements were performed with an antenna of 0.28 m radius. This allowed the localization of noise with a Beamforming technique in the frequency range higher than 1 kHz. Its main use has been to localize different “sound leakage” routes that could compromise noise insulation mitigation
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
Estimation of the pavement condition index via tyre cavity noise measurements and AI signal processing
No full textRegular monitoring of the pavement condition is an essential feature to ensure both traffic safety and passenger comfort. In fact, pavement distresses directly influence traffic safety and passenger comfort and have severe negative effects on air and noise pollution of the vehicles. In this field local agencies commonly use the Pavement Condition Index (PCI), which is based on pavement distress types and their spatial extension, as a reference indicator of the pavement condition. Unfortunately, traditional methods to evaluate PCI can require an on-site ”walk and look” approach that are time-consuming, expensive and may request the closure of the road to traffic. To overcome such difficulties, in the last years different measurement methods have been developed and tested. In this paper an innovative methodology to estimate the PCI in urban context, permitted a dynamic and continuous acoustic measurement of tyre cavity noise (TCN) by means of a microphone inside the tyre. This innovative way involved the definition of new pavements classifying parameters. The new indicators seem to show a good agreement with the PCI values evaluated with the previous methodology. A possible improvement of the method will be tested by applying an AI signal processing to infer the PCI value from the TCN
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
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