Search results for " sonic"
showing 10 items of 19 documents
Perception and replication of planar sonic gestures
2012
As tables, boards, and walls become surfaces where interaction can be supported by auditory displays, it becomes important to know how accurately and effectively a spatial gesture can be rendered by means of an array of loudspeakers embedded in the surface. Two experiments were designed and performed to assess: (i) how sequences of sound pulses are perceived as gestures when the pulses are distributed in space and time along a line; (ii) how the timing of pulses affects the perceived and reproduced continuity of sequences; and (iii) how effectively a second parallel row of speakers can extend sonic gestures to a two-dimensional space. Results show that azimuthal trajectories can be effectiv…
Terapia trans-cranica ad ultrasuoni focalizzati guidati da Risonanza Magnetica: studio retrospettivo sui parametri di trattamento
2019
SCOPO DEL LAVORO: La terapia trans-cranica ad ultrasuoni focalizzati guidati da Risonanza Magnetica (tcMRgFUS) è stata recentemente introdotta per il trattamento non invasivo di alcuni disordini del movimento quali il tremore essenziale (ET) ed il Parkinson idiopatico unilaterale prevalentemente tremorigeno (PD). Sebbene con tale tecnica sia possibile generare con successo talamotomie del nucleo Vim nella maggior parte dei pazienti, in alcuni casi si incontrano difficoltà nell’indurre un incremento di temperatura nel target pianificato sufficiente ad indurre e consolidare una lesione permanente. La causa di questi fenomeni è da ricercare nelle caratteristiche specifiche del tavolato cranico…
Interaction by ear
2019
Abstract Speech-based interaction is now part of our everyday experiences, in the home and on the move. More subtle is the presence of designed non-speech sounds in human-machine interactions, and far less evident is their importance to create aural affordances and to support human actions. However, new application areas for interactive sound, beyond the domains of speech and music, have been emerging. These range from tele-operation and way-finding, to peripheral process monitoring and augmented environments. Beyond signalling location, presence, and states, future sounding artifacts are expected to be plastic and reconfigurable, and take into account the inherently egocentric nature of so…
Alternating current voltammetric determination of DNA damage
1990
Abstract The conditions for alternating current (a.c.) voltammetric DNA determinations have been investigated with respect to its use with alkaline filter elution techniques at low DNA concentrations. In inorganic electrolyte solutions three current peaks can be distinguished: peak I around −1.1 V caused by the reorientation or desorption of DNA segments; peak II around −1.2 V caused by the native DNA (nDNA) form; peak III caused by denatured DNA (dDNA) at −1.4 V. Sonication of nDNA increases the peak current, however not with dDNA. Both dDNA and nDNA give linear peak current increments with DNA increments, their regression lines cutting the concentration axis at the origin. In filter eluti…
Impact of the Extraction Method on the Chemical Composition and Antioxidant Potency of Rosmarinus officinalis L. Extracts
2023
Rosmarinus officinalis L. is a dietary source that produces polyphenols as secondary metabolites. These natural compounds with potent antioxidant abilities are increasingly recommended as a supplement to inhibit oxidative stress. In the current work, we evaluated the impact of the extraction method on the chemical composition of R. officinalis extract, especially on the content of carnosic (CA) and rosmarinic (RA) acids using UPLC-MS-DAD as well as on their antioxidant potency. Four extracts of Tunisian rosemary were obtained from non-conventional extraction techniques:ultrasound-assisted extraction (UAE),supercritical extraction (SFE) and UAE and SFE combined ((UAE-SFE(I), UAE-SFE(II)). Th…
Sonication-Induced Modification of Carbon Nanotubes: Effect on the Rheological and Thermo-Oxidative Behaviour of Polymer-Based Nanocomposites.
2018
The aim of this work is the investigation of the effect of ultrasound treatment on the structural characteristics of carbon nanotubes (CNTs) and the consequent influence that the shortening induced by sonication exerts on the morphology, rheological behaviour and thermo-oxidative resistance of ultra-high molecular weight polyethylene (UHMWPE)-based nanocomposites. First, CNTs have been subjected to sonication for different time intervals and the performed spectroscopic and morphological analyses reveal that a dramatic decrease of the CNT's original length occurs with increased sonication time. The reduction of the initial length of CNTs strongly affects the nanocomposite rheological behavio…
Evaluation of the Behavior of Phenolic Compounds and Steviol Glycosides of Sonicated Strawberry Juice Sweetened with Stevia (Stevia rebaudiana Berton…
2019
In this study, the influence of stevia addition and sonication processing parameters on the phenolic content and profile as well as the steviol glycosides of strawberry juice-based samples was investigated. For this purpose, three matrices&mdash
L'impronta sonica di manufatti di interesse artistico e oggetti museali
2008
Viene presentata una nuova tecnica di indagine non invasiva, sicura e rapida, per l’identificazione univoca e per il monitoraggio dell’integrità di manufatti costituiti da materiali rigidi, quali vasellame, statue e in generale oggetti lapidei, metallici o lignei. La tecnica sfrutta la capacità degli oggetti di vibrare se sollecitati da una sorgente esterna artificiale e si basa sullo studio delle oscillazioni smorzate indotte. Così è possibile costruire una impronta sonica degli oggetti stessi, una sorta di DNA che li possa identificare senza alcun dubbio ed eventualmente possa anche valutarne lo stato di consistenza meccanica (o integrità) come monitoraggio nel tempo. L’applicazione della…
L’indagine sonica ed ultrasonica come prassi necessaria alla conoscenza di strutture complesse. Il rimontaggio di una statua di epoca romana da Locri…
2008
Soil remediation: humic acids as natural surfactants in the washings of highly contaminated soils
2005
The remediation of the highly contaminated site around the former chemical plant of ACNA (near Savona) in Northern Italy is a top priority in Italy. The aim of the present work was to contribute in finding innovative and environmental-friendly technology to remediate soils from the ACNA contaminated site. Two soils sampled from the ACNA site (A and B), differing in texture and amount and type of organic contaminants, were subjected to soil washings by comparing the removal efficiency of water, two synthetic surfactants, sodium dodecylsulphate (SDS) and Triton X-100 (TX100), and a solution of a natural surfactant, a humic acid (HA) at its critical micelle concentration (CMC). The extraction …