1,721,013 research outputs found
Sistema non invasivo di monitoraggio delle funzionalità dell’apparato respiratorio
No full textIn questo lavoro è presentato un innovativo dispositivo elettromedicale, che si avvale delle tecnologie
elettroniche ed informatiche più avanzate e che in maniera non invasiva e non fastidiosa per il paziente,
tramite la sola acquisizione e post-elaborazione tridimensionale (3-D) dei suoni polmonari, consente un
monitoraggio altamente affidabile della funzionalità respiratoria con lo scopo sia di prevenire patologie
acute allo stato incipiente o addirittura latente, sia di verificare in tempo reale e/o in differita l’efficacia di
una terapia curativa di patologie in atto a carico dell’apparato respiratorio
Gold doping effects on swelling of teflon-like thin films
No full textWe report on the swelling process in gold-doped teflon-like films as a function of metal concentrations. The film thickness variation, measured in low-pressure acetone vapour using an ellipsometric technique, shows, with a range of 0.001-9 mbar, a linear increase in gold content. This trend disappears for metal percentages near to the percolation threshold, an effect which is also evident from the time evolution of the swelling process at constant pressure. PACS: 07.07Df; 81.15Cd; 83.85Gk
Sistema di monitoraggio remoto continuo, non invasivo, della salute
No full textIn questo lavoro è presentato il progetto di un sistema di monitoraggio remoto continuo, non invasivo, della
salute. Tale sistema mette insieme tutti i vantaggi ed i pregi dei sistemi già esistenti, superandone i limiti con
soluzioni tecnologicamente innovative. In particolare il sistema consente una maggiore facilità d’uso ed
economicità, incrementa il numero dei parametri vitali monitorati con una considerevole riduzione
dell’hardware ed infine permette di individuare la posizione del soggetto ed attivare soccorsi in tempo reale
pur in situazioni di pericolo di vita lontano dalle mura domestiche
Swelling of CFx and CFx(Au) films
No full textThe article reports on the swelling phenomenon, observed in the presence of acetone vapors in undoped and Au doped Teflon-like films. The Au presence enhances the degree of the swelling of the Teflon. Moreover, the metal grains embedded in the insulating matrix are used to detect swelling with an electrical method. A conductance model of metal embedded dielectric materials is used to describe the conductance variations with the polymer volume change. (C) 2000 American Institute of Physics. [S0021-8979(00)05504-3]
Scrivo, dunque so chi sono
No full textIl saggio studia i dati emersi da una ricerca qualitativa, in riferimento ad una esperienza educativa di scrittura autobiografica per la promozione delle life skills, avvenuta nel corso della quarantena del 2020
A new model of microwave quasi 3D PBG-based devices
No full textWe present a very accurate and fast model of Photonic Band-Gap (PBG) structure characterized by a two-dimensional (2D) periodic change of the refractive index and finite height, therefore named quasi 3D PBG. The model is based on the Floquet-Bloch formalism, we have demonstrated to be particularly suitable to design PBG devices. The model allows both a significantly faster convergence than other more complex numerical models, and a greater accuracy than other approximate models. Simulations run very quickly providing the geometrical dimensions, the forbidden frequency range, the propagation constants, the total field distribution and the modal losses
A new approach to organic solvent detection: High-reflectivity Bragg reflectors based on a gold nanoparticle/teflon-like composite material
No full textA new sensing element for organic solvents based on a polymeric distributed Bragg reflector (DBR) is presented. The periodic stack consists of alternating Teflon-like and gold nanoparticle/Teflon-like layers, and shows high reflectivity in the optical telecommunications spectral range. Sensing properties are due to the peculiar absorbing behavior of composite layers, which swell in the presence of organic vapors, causing DBR periodicity change and consequently the high reflectivity window shift (see Figure)
Infrared distributed Bragg reflectors based on amorphous SiC/SiO2 heterostructures
No full textAmorphous SiC/SiO2 distributed Bragg reflectors (DBR) deposited by ion beam sputtering at room temperature is reported on in this letter. The DBR consists of only 2.5 pairs and exhibits high peak reflectivity (84%) around similar to 1.7 mu m with a full width at half maximum of about 1000 nm. The measured reflectivity spectrum is well reproduced by the equivalent layer theory by using the measured refractive indices of SiC and SiO2 and including absorption losses. (C) 1997 American Institute of Physics
Organic-inorganic dielectric multilayer systems as high reflectivity distributed Bragg reflectors
No full textUnprecedentedly high reflectivity distributed Bragg reflectors consisting of fluorocarbon polymer (CFx) and high refractive index inorganic oxide multilayers have been fabricated by means of assisted ion-beam sputtering at room temperature. Multilayer stacks consisting of a CFx/TiOx and CFx/HfOx pairs exhibit reflectivities larger than 98% in the infrared and ultraviolet spectral region, respectively. The superior wide tunability and the high efficiency, with respect to inorganic-inorganic multilayers is due to the exceptionally low refractive index of the fluorcarbon polymer (n similar or equal to 1.35) on a very large spectral region (300-2000 nm). (C) 1997 American Institute of Physics
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