1,721,188 research outputs found
A fast double-step pulse forming circuit for ion extraction in a linear time-of-flight mass spectrometer
No full textINVERSIONE DI SEGNALI LIDAR PER LA DETERMINAZIONE DELLE PROPRIETA' DEGLI AEREOSOL ATMOSFERICI
No full textDispositivo Lidar a retrodiffusione elastica e retroriflessione per la caratterizzazione del particolato atmnosferico
No full textDispositivo Lidar per la caratterizzazione del particolato atmosferico, basato sull'uso del solo scatering elastico anche a diverse lunghezze d'onda. Consente la determinazione diretta del profilo spaziale del coefficiente di retrodiffusione e del coefficiente di estinzione a lunghezze d'onda, dall'infrarosso all'ultravioletto, senza la necessità di alcuna ipotesi sulla natura del particolato, con una risoluzione spaziale dell'ordine delle decine di metri, una risoluzione temporale dell'ordine del minuto e distanze di operatività fino a diversi chilometr
Elastic backscattering and backreflection lidar device for the characterization of atmospheric particles
No full textA method is described for the characterization of atmospheric particles by means of a lidar device. The method provides to send a laser pulse in the atmosphere, a part of which is directly backscattered by the particles in the atmosphere. A reflecting optical device is provided, that is positioned at a predetermined distance d from the lidar device, whereby a part of the laser pulse that directly reaches the reflecting device is backreflected and is later backscattered by the particles in the atmosphere thus generating a counterpropagating backscattering signal directed towards the reflecting device, which signal reaches the reflecting device and is backreflected towards the lidar device. The lidar device detects the direct backscattering and counterpropagating signals. The optical characteristics of the particles are determined on the basis of the direct backscattering signal and the counterpropagating backscattering signal
OPTICAL SPECTROSCOPY DIAGNOSTIC AND THIN FILM DEPOSITION OF LASER ABLATED RARE EARTH-NI2-C2-B PLASMA PLUMES
No full textWe describe optical spectroscopy diagnostics of UV laser ablated rare earth-Ni-2-B-2-C superconducting targets. In the light of this characterization. we have optimized the parameters for high-quality thin film deposition of borocarbide compounds. Our measurements have evidenced relevant differences in the flow velocity as well as in the spatial divergence of different plasma components. This is related to the influence of the different masses of the atoms of the multicomponent target during plume expansion. These results have led us to identify the target-to-substrate distance and substrate temperature as the critical parameters for the deposition of high-quality thin films, as clearly evidenced by residual resistivity ratio measurements. (C) 2002 Elsevier Science B.V. All rights reserved
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