646 research outputs found
Gilt stuccoes of the italian baroque
No full textC. Colombo, L. Toniolo, S. Bruni, P. Fermo, A. Casoli, G. Palla, C. L. Bianchi, Gilt stuccoes of the italian baroque. Studies in Conservation, 43, 1998, 201-208
Modelling and simulation of direct steam injection for tomato concentrate sterilization
No full textDirect steam injection (DSI) is a sterilization technique which is often used for high viscosity fluid food when the preservation of the quality characteristics and energy efficiency are the priority. In this work an apparatus for the sterilization of tomato concentrate has been analyzed by means of multidimensional CFD (Computational Fluid Dynamics) models, in order to optimize the quality and safety of the treated food. A multidimensional two-phase model of steam injection inside a non-newtonian pseudoplastic fluid was adopted to evaluate the thermal history of the product and the steam consumption during the target process. Subsequently CFD analysis has been extended to examine the effects of the different process parameters (sterilization temperature, steam flow rate, radial and axial temperature profiles, nozzle geometry) on the resulting product. Result obtained are in agreement with available data acquired in industrial plant
The analysis of archaeological glass by inductively coupled plasma emission spectroscopy
No full textThe analysis of archaeological glass by inductively coupled plasma optical emission spectroscopy
No full textAn analytical procedure is described for the analysis of archaeological glass by inductively coupled plasma optical emission spectroscopy (ICP-OES). Glass samples were analysed in solution after fusion with lithium metaborate at 1100°C. The analyses were performed in the sequential multielemental mode of operation, with the determination of 15 elements in four analytical runs; only elements with not too large concentration difference were analysed in a single run. The following elements were accounted for: Si, Na, Ca, Al, Fe, Mg, Mn, Ti, Sr, Ba, Cr, Ni, Cu, Co, Pb. © 1992 Springer-Verlag
Analysis and classification of ceramic material excavated on a South Italian archaeological site
No full textSimulation approaches for the study of the oil flow rate distribution in lubricating systems with rotating shafts
No full textThis study addresses the issue of predicting the distribution of lubricant flow through the outlets of a rotating
shaft used in vehicle power transmission. A typical geometry with closely spaced rows of holes, suitable for the
lubrication of multi-disk clutches, was considered. Both lumped parameter and computational fluid dynamics
approaches were applied and compared. The test rig for model validation was designed with a variable speed shaft
featuring an axial oil inlet and three equally spaced pairs of radial outlet holes. The main characteristic of the
experimental facility is the possibility to selectively measure the flow rates through each outlet. It was found that the
three-dimensional model based on the multiple reference frame approach provides a reliable prediction of how the
flow rate is distributed. Generally, the flow rate is lower through the outlet closest to the inlet and is maximum at the
farthest exit. The flow distribution is minimally affected by the shaft speed. The influence of geometric parameters
on making the flow distribution more uniform was studied. It was found that a better flow balance is obtained with
a low ratio between the diameter of the radial holes and that of the axial channel. The results obtained offer bestpractice
guidelines for accurately simulating comparable systems, in order to optimize reliability of the mechanical
transmission and energy efficiency of the flow generation uni
Scientific analysis of roman glass from Augusta Praetoria
No full textFifty-five fragments of Roman glass from Augusta Praetoria (Aosta, Italy) were analysed by inductively coupled plasma optical emission spectroscopy determining 15 elements (Si, Na, Ca, Al, Fe, Mg, Mn, Ti, Sr, Ba, Cr, Ni, Cu, Co and Pb) on dissolved samples; in addition, potassium was determined by flame atomic absorption spectroscopy. The analytical results indicate that all the fragments, with one exception, are silica-soda-lime glasses; (he exception is a potash glass. Cluster analysis was performed on the analytical data by accounting for either 14 (all the elements searched for but Ni and Pb) or eight elements (after further removal of Si, Fe, Mn, Cr, Cu and Co from the data set). The results obtained indicate that, once colouring and decolouring agents are removed, the classification of the glasses seems to be mainly determined by chronology; separate groups within coeval fragments may indicate different provenances
Characterization of medieval proteinaceous painting media using gas chromatography and gas chromatography - mass spectroscopy
No full textFRESENIUS' J. ANAL. CHEM
Compte rendu de James Lequeux, Thérèse Encrenaz & Fabienne Casoli : «La révolution des exoplanètes»
No full textLequeux (James) - Encrenaz (Thérèse) - Casoli (Fabienne), La révolution des exoplanètes. – Les Ulis : EDP Sciences, 2017. – xi, 213 p. – (Une introduction à). – 1 vol. broché de 17 × 24 cm. – 29,00 €. – isbn 978-2-7598-2111-2
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