45 research outputs found
Renal function and physical fitness after 12-mo supervised training in kidney transplant recipients
To evaluate the effect of a 12-mo supervised aerobic and resistance training, on renal function and exercise capacity compared to usual care recommendations
Continuous Measurement of the Temperature of an Industrial Plant Torch
The present invention concerns an apparatus
(10) for continuous measurement of the temperature of
an industrial plant or refinery torch, comprising an optical
coupling system (11), i.e. a system of lenses and/or mirrors
and optical fiber cables, and a spectroscopic analyzer,
as well as an electronic processor (14), apt to the
management of the data acquisition procedures and of
the storage and transmission of the same, in connection
with said spectroscopic analyser to enable the passage
of data.
The present invention additionally concerns methods
of continuous measurement of the temperature of
an industrial plant or refinery torch by means of said apparatus
A Model for Pore Growth in Anodically etched Gallium Phosphide
The electrochemical etching process of porous gallium phosphide was studied by means of the
characteristic current–potential sI–Vd curves. Measurements were performed in H2SO4 0.5-M
aqueous solution both in the dark and by illuminating the samples with the 351-nm line of an argon
laser. Raman spectroscopy was applied to investigate the surface morphology of the samples
prepared under different anodizing conditions within the potentiostatic regime. Based on a few
reasonable assumptions, a simple model of pore growth is proposed. The enhancing effect in current
intensity due to the branching of pores and the opposite effect due to a concomitant decrease in the
effective cross area available for carrier transport are accounted for to explain the main features of
the recorded I–V curves
Low temperature time resolved photoluminescence of the 3.1 and 4.2 eV emission bands in Ge-doped silica
Time resolved photoluminescence (PL) has been performed on Ge-doped silica preform in the temperature range 10 to
295 K. Under pulsed KrF laser (5 eV) the well known c~ and [3 emissions have been recorded at different delays from
excitation. An accurate analysis of the time resolved spectra taken at different temperatures has shown the composite
property of the two PL structures. At room temperature cx components (c~ ], ~2) are peaked at 4.09 and 4.26 eV with a decay
time of about 10 ns. The peak energies of [3j and 132 components are calculated at 3.03 and 3.21 eV with lifetimes of 111
and 94 ~s, respectively. As temperature is decreased, a l and o~ 2 display the normal behaviour increasing in intensity down
to 125 K; on the contrary, in the same temperature range, 13 n and [32 undergo a quenching of their intensities. Taking into
account their mutual spectral characteristics, ~ has been correlated to [31 and c~ 2 to [32. The two sets of emission bands are
tentatively attributed to a single center stabilized in different environments of the glassy matrix
The temperature dependence of Cr3+:YAG zero-phonon lines
This paper deals with the photoluminescence temperature dependence of the zero-phonon lines of Cr3+ ions in an yttrium aluminium garnet (YAG) matrix. Experimental data were analysed in the framework of electron-phonon coupling in the quadratic approximation and it was found that Cr3+ ions in the YAG matrix are strongly coupled with lattice vibrations, with a Debye temperature of about 550 K and a value of the quadratic coupling constant of 0.65. The analysis of both homogeneous and inhomogeneous contributions to the photoluminescence linewidth is performed and the results obtained are compared with previously reported data for Fe3+:YAG and discussed with respect to the different dependences of the two transition metal ions on the crystal field
Excitation pattern of the blue emission in Ge-doped silica
The luminescence of Ge-doped glassy SiO2 has been investigated at room temperature using a deuterium lamp as the excitation source in the ultraviolet and vacuum ultraviolet energy range. Two emission bands are observed around 3 and 4 eV as the excitation increases from 4.5 to 8 eV. The peak shift and bandwidth broadening of the emission around 3 eV indicate the overlapping of several bands. We carried out a Gaussian best-fit approach of the detected spectra and extracted the excitation spectra of three distinct emission: a 2.9 eV band with two excitation channels at 4.7 and 5.3 eV and no contribution above 6 eV and the well-known composite beta-band (3.1 eV). The latter is resolved into two Gaussian components whose excitation spectra present three main excitations around 5.1, 6.5 and 7.3 eV. (C) 2003 Elsevier Science B.V. All rights reserved