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168 results on '"Scirè S"'

1. A Robotic arm for optical and gamma radwaste inspection

Author

Russo L., Cosentino L., Pappalardo A., Piscopo M., Scirè C., Scirè S., Vecchio G., Muscato G., and Finocchiaro P.

Subjects
Physics, QC1-999
Abstract

We propose Radibot, a simple and cheap robotic arm for remote inspection, which interacts with the radwaste environment by means of a scintillation gamma detector and a video camera representing its light (< 1 kg) payload. It moves vertically thanks to a crane, while the other three degrees of freedom are obtained by means of revolute joints. A dedicated algorithm allows to automatically choose the best kinematics in order to reach a graphically selected position, while still allowing to fully drive the arm by means of a standard videogame joypad.

Published
2014
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2. Characterization of the silicon+6LiF thermal neutron detection technique

Author

Pappalardo, A., Barbagallo, M., Cosentino, L., Marchetta, C., Musumarra, A., Scirè, C., Scirè, S., Vecchio, G., and Finocchiaro, P.

Subjects
Physics - Instrumentation and Detectors
Abstract

The worldwide need to replace 3He for the neutron detection has triggered R&D on new technologies and methods. A promising one is based on commercial solid state silicon detectors coupled with thin neutron converter layers containing 6Li. After proving the feasibility of this technique, we characterized the behavior of such a detector with different converter layer thicknesses. In this paper we also disentangle other contributions to the overall spectrum shape observed with this kind of detector, proving that its detection efficiency can be made reasonably high and that the gamma/neutron discrimination capability is comparable to the one of 3He tubes., Comment: Submitted to Nuclear Instruments and Methods in Physics Research, section A

Published
2015
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10. A new monolithic silicon detector telescope with bidimensional sensitivity for imaging applications

Author

Amorini, F., Sipala, V., Cardella, G., Auditore, L., Boiano, C., Carbone, B., Castoldi, A., Di Pietro, A., Fallica, G., Figuera, P., Finocchiaro, P., Grassi, L., La Guidara, E., Guazzoni, C., Guazzoni, P., Lombardo, I., Loria, D., Pappalardo, A., Pirrone, S., Randazzo, N., Rizzo, F., Russo, G.V., Russotto, P., Scirè, C., Scirè, S., Trifirò, A., Trimarchi, M., Valvo, G., and Zetta, L.

Published
2010
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15. Imaging monolithic silicon detector telescopes

Author

Amorini, F., Sipala, V., Cardella, G., Boiano, C., Carbone, B., Cosentino, L., Costa, E., Di Pietro, A., Emanuele, U., Fallica, G., Figuera, P., Finocchiaro, P., La Guidara, E., Marchetta, C., Pappalardo, A., Piazza, A., Randazzo, N., Rizzo, F., Russo, G.V., Russotto, P., Scirè, C., Scirè, S., Trifirò, A., Trimarchi, M., and Valvo, G.

Published
2008
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29. Inverse opal TiO2 as visible-light driven photocatalysts

Author

Fiorenza, R., Scirè, S., Su, B., BELLARDITA, Marianna, PALMISANO, Leonardo, Fiorenza, R., Bellardita, M., Palmisano, L., Scirè, S., and Su, B.

Subjects
Titanium dioxide, Inverse opal, Macroporous structure, Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie
Abstract

Semiconductor photocatalysts have attracted a great deal of attention due to their potential application in environmental remediation. Titanium dioxide has been extensively investigated as the most promising photocatalyst. To improve the optical response of TiO2 in the visible region, Inverse Opal TiO2 has been recognized as an efficient photocatalyst due to its unique properties in terms of uniformly ordered and interconnected macroporous architecture.

Published
2017

32. TiO2-CeO2 based catalysts for photocatalytic oxidation of VOC and water splitting reactions

Author

Fiorenza, R., Scirè, S., BELLARDITA, Marianna, PALMISANO, Leonardo, Fiorenza, R., Scirè, S., Bellardita, M., and Palmisano, L.

Subjects
Photocatalysis, Titanium dioxide, VOC's degradation, Hydrogen production, Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie
Abstract

Photocatalysis with TiO2 is one of the most promising green process for the decomposition of organic pollutants and the hydrogen production . Photo-oxidation of 2-propanol, representative of volatile organic compounds (VOC) and photo-catalytic water splitting for H2 production were investigated over TiO2 catalysts doped with a metal (Au and Ag at 1wt. %) and/or ceria (10 wt.%).

Published
2016

41. Carbon supported bimetallic Ru‐Co catalysts for H2 production through NaBH4 and NH3BH3 hydrolysis.

Author

Fiorenza, R., Scirè, S., and Venezia, A. M.

Subjects
*SODIUM borohydride, *HYDROLYSIS, *BIMETALLIC catalysts, *HYDROGEN production, *COBALT, *NUCLEATION
Abstract

Summary: This work investigates the effect of the addition of small amounts of Ru (0.5‐1 wt%) to carbon supported Co (10 wt%) catalysts towards both NaBH4 and NH3BH3 hydrolysis for H2 production. In the sodium borohydride hydrolysis, the activity of Ru‐Co/carbon catalysts was sensibly higher than the sum of the activities of corresponding monometallic samples, whereas for the ammonia borane hydrolysis, the positive effect of Ru‐Co systems with regard to catalytic activity was less evident. The performances of Ru‐Co bimetallic catalysts correlated with the occurrence of an interaction between Ru and Co species resulting in the formation of smaller ruthenium and cobalt oxide particles with a more homogeneous dispersion on the carbon support. It was proposed that Ru°, formed during the reduction step of the Ru‐Co catalysts, favors the H2 activation, thus enhancing the reduction degree of the cobalt precursor and the number of Co nucleation centers. A subsequent reduction of cobalt and ruthenium species also occurs in the hydride reaction medium, and therefore the state of the catalyst before the catalytic experiment determines the state of the active phase formed in situ. The different relative reactivity of the Ru and Co active species towards the two investigated reactions accounted for the different behavior towards NaBH4 and NH3BH3 hydrolysis. [ABSTRACT FROM AUTHOR]

Published
2018
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44. Effect of the Al/Si Atomic Ratio on Surface and Structural Properties of Sol-Gel Prepared Aluminosilicates

Author

La Parola V., Deganello G., Scirè S., and Venezia A. M.

Subjects
FT-IR, alluminosilicati, technology, industry, and agriculture, sol-gel
Abstract

A series of aluminosilicates with an Al/Si ratio ranging from 0 to infinite (0 for pure silica and infinite for pure alumina) was prepared by sol-gel process and characterized by surface and structure techniques. Aluminum trisecbutoxide and tetramethylorthosilicate were used as precursors for the sol-gel synthesis. The acidic properties of the oxides were studied by determination of the zero point charges, through mass titration method, and, for selected samples, by FT-IR spectroscopy of adsorbed pyridine used as a probe for both Brønsted and Lewis acidity. A dependence of the acidity on the Al/Si atomic ratio was found. According to the X-ray diffraction patterns, all the oxides have an amorphous structure except pure alumina exhibiting a g-alumina pattern. The surface areas of the mixed oxides increase with increasing amount of alumina and are higher as compared to the individual oxides. The surface elemental distribution and electronic properties were investigated by X-ray photoelectron spectroscopy. According to the results, good agreement between the surface Al/Si atomic ratio and the analytical ratio is obtained.

Published
2003

48. Modelling the aquatic toxicity of ionic liquids by means of VolSurf in silico descriptors.

Author

Paternò, A., Bocci, G., Goracci, L., Musumarra, G., and Scirè, S.

Subjects
TOXICITY testing, IONIC liquids, CATIONIC surfactants, LEAST squares, QUANTITATIVE research
Abstract

VolSurf+in silicophysicochemical descriptors for both the cationic and the anionic counterparts of ionic liquids (ILs) have been derived. These descriptors, suitable for molecular modelling of IL structures which, due to their amphiphilic nature, interact strongly with biological matrices, can be related to aquatic toxicity by means of a partial least squares statistical model. This model gives an insight into the relationships between structural physicochemical properties and aquatic toxicity as well as a satisfactory quantitative structure–property correlation, allowing prediction of aquatic toxicity scores of ILs. [ABSTRACT FROM AUTHOR]

Published
2016
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