Search results for "Sound"

Mobility determination of lead isotopes in glass for retrospective radon measurements

2008

In retrospective radon measurements, the 22-y half life of (210)Pb is used as an advantage. (210)Pb is often considered to be relatively immobile in glass after alpha recoil implanted by (222)Rn progenies. The diffusion of (210)Pb could, however, lead to uncertain wrong retrospective radon exposure estimations if (210)Pb is mobile and can escape from glass, or lost as a result of cleaning-induced surface modification. This diffusion was studied by a radiotracer technique, where (209)Pb was used as a tracer in a glass matrix for which the elemental composition is known. Using the ion guide isotope separator on-line technique, the (209)Pb atoms were implanted into the glass with an energy of …

Comparison of basis functions for 3D PET reconstruction using a Monte Carlo system matrix.

2012

In emission tomography, iterative statistical methods are accepted as the reconstruction algorithms that achieve the best image quality. The accuracy of these methods relies partly on the quality of the system response matrix (SRM) that characterizes the scanner. The more physical phenomena included in the SRM, the higher the SRM quality, and therefore higher image quality is obtained from the reconstruction process. High-resolution small animal scanners contain as many as 103?104 small crystal pairs, while the field of view (FOV) is divided into hundreds of thousands of small voxels. These two characteristics have a significant impact on the number of elements to be calculated in the SRM. …

Application of non-invasive technologies in dry-cured ham: An overview

2019

Background: Dry-cured ham is one of the most valued food products by Mediterranean consumers. In this sense, the appropriate development of its different production stages is essential to ensure the quality requirements. For this reason, non-invasive technologies have gained popularity and have been reported as useful not only to ensure the food safety of different products, but also to monitor fundamental stages in the production process, such as the salting stage, to analyze the content of different compounds without sample losses, and to correct possible defects in the final product. Scope and approach: This work has been focused on summarizing the studies that describe and have successf…

Ultrasound Effects after Post Space Preparation: An SEM Study

2006

The aim of this study was to evaluate the effect of ultrasonic treatment on occlusion of dentine tubules in root canal walls after post space preparation in endodontically treated teeth. Twenty-four premolars were instrumented and filled using warm vertical condensation; after post space preparation, they were divided into two groups. The control group was treated using the etching procedure. The experiment samples were treated with EDTA irrigation and ultrasound activation for 30 s before the etching procedure. The roots were divided and the canal walls were examined under SEM at 1000x magnification. The debris and open tubule marks were observed at 2, 6, and 10 mm levels using a three-ste…

Noise levels of a track-laying tractor during field operations in the vineyard

2013

Noise in agriculture is one of the risk factors to be taken into account in the assessment of the health and safety of workers; in particular, it is known that the tractor is a source of high noise. The Italian Low Decree 81/2008 defined the requirements for assessing and managing noise risk identifying a number of procedures to be adopted at different noise levels to limit workers exposure. This paper concerns the analysis of the noise risk arising from the use of a tracklaying tractor during field operations carried out in the vineyard. The objective of this study was to evaluate the noise level that comes close to the ear of the operator driving the tractor measuring the values of equiva…

[Non-invasive trans-cranial magnetic resonance imaging-guided focused ultrasounds surgery to treat neurologic disorders]

2016

Negli anni passati le applicazioni non invasive degli ultrasuoni focalizzati guidati da risonanza magnetica per il trattamento dei disordini neurologici sono state osta- colate da limiti tecnici oggi finalmente superati. In Italia, nel corso del 2015, sono stati effettuati i primi trattamenti utilizzando per la prima volta al mondo un comune scanner di risonanza magnetica da 1.5T. I risultati a oggi ottenuti con questa nuova metodica e le sue future possibili appli- cazioni sono molto promettenti e aprono la strada verso nuove opzioni terapeutiche, sicure ed efficaci, un tempo impensabili. In past years non-invasive clinical applications of magnetic resonance-guided focused ultrasound for t…

A free plate model can predict guided modes propagating in tubular bone-mimicking phantoms

2014

The goal of this work was to show that a non-absorbing free plate model can predict with a reasonable accuracy guided modes measured in bone-mimicking phantoms that have circular cross-section. Experiments were carried out on uncoated and coated phantoms using a clinical axial transmission setup. Adjustment of the plate model to the experimental data yielded estimates for the waveguide characteristics (thickness, bulk wave velocities). Fair agreement was achieved over a frequency range of 0.4 to 1.6 MHz. A lower accuracy observed for the thinnest bone-mimicking phantoms was caused by limitations in the wave number measurements rather than by the model itself.

The soundscape of the ceremonies for the beatification of St Teresa of Ávila in the Crown of Aragon, 1614

2015

[EN] The beatification of Saint Teresa of Ávila in October 1614 gave rise to widespread celebrations in many of the cities and towns of the Iberian Peninsula. Printed relaciones describing these celebrations, despite their limitations —in terms of political agenda, propaganda, rivalry and literary style— can nevertheless provide information about musical experience and can help to recreate the ephemeral soundscapes of these events. This article will focus on the ceremonies held in the Crown of Aragon, especially Saragossa and Barcelona, taking into consideration the typology of different musics —heraldic, divine and festive— and factors such as the moment in time, function, dynamic, urban s…

MASSE RENALI INCIDENTALI: DIAGNOSI DIFFERENZIALE IN ECOGRAFIA, TC E RM

2018

« Mouvement est nécessité » Pour une relation au monde du mouvement et de la musique

2021

Starting from a stationary state in order to feed a process, the idea of movement in music can affect both the sound material and the listening (the Hoerspiel...), both the view (musical theater) and the ancillary disciplines (dance or maping-video)... Based on examples taken in the 20th and 21st centuries (Debussy, Berg, Webern, Stravinsky, Stockhausen, Kagel, Ferrari, La Monte Young, Xenakis, Adams, De Chizy, De Mey, Trapani?), musicological study ultimately deduces that the metaphor of movement is for man an experience considered fundamental to his particular relationship to the world.