Search results for "Sounds"
showing 10 items of 106 documents
Synthesis of aryl azides: A probe reaction to study the synergetic action of ultrasounds and ionic liquids
2011
Abstract The combined effect of ultrasounds and ionic liquids was used to perform the synthesis of aryl azides by nucleophilic aromatic substitution in ionic liquid/[1-butyl-3-methylimidazolium][N 3 ] binary mixtures. The ultrasounds efficiency was analyzed as a function of the substrate and of the ionic liquid structure. In the first case, both 6π and 10π electrons aryl halides were considered. As far as the ionic liquid structure is concerned, both aromatic and aliphatic ionic liquids were taken into account. Among aromatic cations, the effects due to different ability in giving hydrogen bond or π–π interactions were considered. The use of a geminal ionic liquid having an aromatic spacer …
I festeggiamenti per le incoronazioni a Palermo di Vittorio Amedeo II (1713) e Carlo III (1735): musica, spettacolo e cerimonia
2018
Le entrate e le rispettive incoronazioni a Palermo di Vittorio Amedeo II di Savoia e Carlo III di Borbone sono state analizzate sotto diversi punti di vista. Tuttavia gli aspetti musicali sono stati finora poco considerati, se non a margine di studi più generali sulla vita musicale palermitana. Il presente contributo è riservato in modo specifico alla cornice sonora dei due eventi, dimostrando come questa costituisse un elemento essenziale al funzionamento della festa e al soddisfacimento dei suoi scopi. Le descrizioni e le testimonianze iconografiche propongono spunti di indagine sulle modalità di esecuzione e sui rapporti con il contesto celebrativo, fornendo anche informazioni sulle occa…
Use of Ultrasound in Reconditioning by Welding of Tools Used in the Process of Regenerating Rubber
2018
Addressing the problem of reconditioning large parts is of particular importance, due to their value and to the fact that the technologies for their reconditioning are very complex. The tools used to refine regenerated rubber which measure 660 mm in diameter and 2130 mm in length suffer from a rather fast dimensional wear. Within this research, the authors looked for a welding reconditioning procedure that would allow a very good adhesion between the deposited material layer and the base material. In this regard, the MAG (Metal Active Gas) welding process was used, but the ultrasonic activation of the welding process was also considered. Thus, the wire used for welding was activated conside…
An open access database for the evaluation of heart sound algorithms
2016
In the past few decades, analysis of heart sound signals (i.e. the phonocardiogram or PCG), especially for automated heart sound segmentation and classification, has been widely studied and has been reported to have the potential value to detect pathology accurately in clinical applications. However, comparative analyses of algorithms in the literature have been hindered by the lack of high-quality, rigorously validated, and standardized open databases of heart sound recordings. This paper describes a public heart sound database, assembled for an international competition, the PhysioNet/Computing in Cardiology (CinC) Challenge 2016. The archive comprises nine different heart sound databases…
Classification of Heart Sounds Using Convolutional Neural Network
2020
Heart sounds play an important role in the diagnosis of cardiac conditions. Due to the low signal-to-noise ratio (SNR), it is problematic and time-consuming for experts to discriminate different kinds of heart sounds. Thus, objective classification of heart sounds is essential. In this study, we combined a conventional feature engineering method with deep learning algorithms to automatically classify normal and abnormal heart sounds. First, 497 features were extracted from eight domains. Then, we fed these features into the designed convolutional neural network (CNN), in which the fully connected layers that are usually used before the classification layer were replaced with a global averag…
La perception phonémique en français des apprenants polonophones (le cas des voyelles antérieures de moyenne aperture : [e][ɛ])
2017
The perception of sounds of a foreign tongue influences the quality of comprehension and speaking in the language, as well as learning how to read and write properly. The differentiation and identification of sounds enables the development of aural-verbal memory, subsequently associating particular sound patterns with particular meanings. In other words, a developed perception of sounds ensures an efficient communication in a foreign language. Since learners perceive foreign sounds with varied proficiency, the teacher should recognize the difficulties and undertake remedial measures to facilitate learning progress. This article aims to present an educational tool, currently in development, …
Asthma attributable to atopy: does it depend on the allergen supply?
2007
The use of the population attributable fraction (PAF) of asthma owing to atopy has not been widely used in epidemiological studies on childhood asthma, especially to compare regions of the same country. The present study includes 1039 children from Cartagena, Spain (Mediterranean coast) and 663 from Madrid (centre of Spanish plateau) using the ISAAC phase II methodology (questionnaire and prick test to the most common allergens). While there were no differences in asthma symptoms between school children (aged 10–11 yr) from Madrid and Cartagena, atopy to any allergen was significantly higher in those from Madrid (40.9% vs. 29.3%, respectively, p < 0.0001). However, children from Madrid were…
A different pattern of risk factors for atopic and non-atopic wheezing in 9-12-year-old children
2005
Few epidemiological studies have compared the risk factors of asthma or wheezing between atopic and non-atopic children. The objective of this study was to determine if there are specific risk factors for current wheezing related to atopic status in schoolchildren. Schoolchildren 9-12 yr of age from three Spanish cities (n = 2720) were subject to a cross-sectional study of asthma risk factors (by questionnaire) and atopy (by skin prick test) according to the ISAAC phase-II protocol. Risk factors for current wheezing (in the last 12 months) as reported by parents were investigated among the atopic (positive prick test to at least one allergen) and the non-atopic (negative prick test) childre…
Acoustic rendering of particle-based simulation of liquids in motion
2009
In interaction and interface design, the representation of continuous processes often uses liquid metaphors, such as dripping or streaming. When an auditory display of such processes is required, an approach to sound-synthesis based on the physics of liquids in motion would be the most convincing, especially when real-time interaction is into play. In order to bridge the complexity of fluid-dynamic simulations with the needs of interactive sonification, we propose a multi-rate sound synthesis of liquid phenomena. Low-rate smoothed-particle hydrodynamics is used to model liquids in motion and to trigger sound-emitting events. Such events, such as solid-liquid collision, or bubble formation, …
«Ad serviendum in cantari di musica et sunari di tasto»: contesti e modalità di formazione musicale a Palermo in età moderna
2022
Il saggio discute alcune delle modalità di formazione musicale diffuse a Palermo nel periodo del viceregno spagnolo, dai primi anni del Cinquecento sino alla prima metà del Settecento. Considerando l'arco temporale, si propone una panoramica generale delle occasioni, dei contesti e dei luoghi nei quali a Palermo si potevano apprendere nozioni di natura musicale. Infatti, anche in seguito alla fondazione nel 1617 del Conservatorio per i “figlioli dispersi”, dove circa un secolo dopo veniva introdotto ufficialmente l’insegnamento della musica, molti altri sistemi continuarono a esercitare la loro attività di formazione, conservando un’innegabile vitalità. È a queste realtà che si rivolgerà la…