1,721,031 research outputs found
Measurements in opera houses: comparison between different techniques and equipment
Full text linkIn room acoustics many objective parameters to quantify subjective impressions have been introduced.
These quantities can be measured by using a wide variety of powerful tools and equipment. The results can be
influenced by the measurement techniques and instruments used. Furthermore the results also depend on the position
and condition of the hall in which the measurements are made.
With the aim of obtaining a procedure to qualify a room, and in particular an opera house, which will give comparable
and reproducible results anywhere else, an extensive measurement campaign was made. In this paper some of the
results of the measurement campaign are presented. Comparisons were made both between different tools (real-time
analyzer, DAT, PC-board, sources) and between different techniques (stationary, impulsive, pseudo-random)
Low frequency noise and disturbance assessment methods: A brief literature overview and a new proposal
No full textSeveral studies have presented the effects of environmental noise on communities, focusing attention on sleep time events. The noise introduced into a dwelling is mostly evaluated using the A-weighted sound pressure level (LAeq) as the only parameter to determine the perceived disturbance. Nevertheless, if noise is produced by activities or sources characterised by a low frequency contribution, the measurement of LAeq underestimates the real disturbance, in particular during sleep time. The aim of this contribution is to analyse the low frequency disturbance phenomenon into technical and scientific literature and to investigate if any possible objective method is available in order to assess noise disturbance inside dwellings
Acustica in edilizia. Teoria, metodi e applicazioni per l’isolamento acustico con lana di roccia
No full textLa nuova edizione del manuale di acustica in edilizia ROCKWOOL nasce dalla volontà di aggiornare uno strumento dimostratosi utile per comprendere e interagire con gli aspetti legati all’acustica edilizia. Pensato per tutti coloro che quotidianamente si trovano a dover affrontare le problematiche acustiche, il libro permette di essere consultato su più livelli di approfondimento, consentendo così sia una facile lettura al neofita che l’approfondimento degli aspetti più specifici all’esperto. Ciascun capitolo è stato infatti organizzato in modo da risultare il più possibile indipendente dagli altri per tematiche e contenuti. Il manuale parte dagli aspetti teorici per poi affrontare gli aspetti applicativi e di modellazione fino a giungere al non meno importante contesto normativo. La versione aggiornata del manuale di acustica edilizia, la cui prima edizione è stata pubblicata nel 2004, traccia, nell’arco di cinque capitoli, un quadro esaustivo delle potenzialità di miglioramento delle prestazioni acustiche attraverso sistemi con lana di roccia.
Il primo capitolo, che tratta i principi base di acustica, è rimasto sostanzialmente invariato rispetto alla versione originale. Sono stati introdotti i concetti fondamentali che serviranno al lettore per affrontare gli argomenti trattati nei capitoli successivi.
Il secondo capitolo è interamente incentrato sull’acustica degli edifici, sulle misurazioni in opera ed in laboratorio dei requisiti prestazionali e sulla caratterizzazione dei materiali utilizzati in edilizia. Rispetto alla versione precedente, vengono trattatati alcuni argomenti aggiuntivi, quali, per esempio, la misura sperimentale del rumore da pioggia e la determinazione dell’indice di valutazione dell’incremento del potere fonoisolante.
Il terzo capitolo presenta invece tematiche nuove rispetto alla versione precedente del manuale, con approfondimenti sui modelli di calcolo previsionale delle prestazioni acustiche degli edifici, con particolare riferimento all’aggiornamento delle norme tecniche UNI EN ISO 12354.
Nel quarto capitolo viene descritto un modello previsionale sviluppato per i materiali in lana di roccia ROCKWOOL, aggiornato rispetto alla precedente formulazione, includendo anche la possibilità di considerare strati resistivi.
Nell’ultimo capitolo viene presentato il quadro legislativo e normativo aggiornato, soprattutto in riferimento all’adozione dei Criteri Ambientali Minimi (CAM) acustici e alle relative norme sulla classificazione acustica degli edifici e sul comfort degli ambienti interni
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
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