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RISS 인기검색어
- 검색키워드
- 저자 : E. A. FAZIO (검색결과 4 건)
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Structural and optical properties of pulsed laser deposited ZnO thin films
E. Fazio,S. Patanè,S. Scibilia,A.M. Mezzasalma,G. Mondio,F. Neri,S. Trusso 한국물리학회 2013 Current Applied Physics Vol.13 No.4
Nanocrystalline ZnO thin films were grown by means of pulsed laser deposition. The ablation process was carried out at relatively low background oxygen gas pressure (10 Pa) and by varying the substrate temperature up to 600 C. Information on the structural and morphological properties of the deposited thin films have been obtained by means of X-ray photoelectron, Raman spectroscopies, X-ray diffraction (XRD) and atomic force microscopy (AFM). The results showed that all the deposited films are substoichiometric in oxygen and with a hexagonal wurtzite crystalline structure, characterized by features of some tens of nanometers in size. An improvement of the films’ crystalline quality was observed for the deposition temperature of 300 ℃ while the further increase of the deposition temperature up to 600℃ induces a worsening of the material’s structural properties with the development of a large amount of nanoparticle’s clusters. The analysis of the XRD patterns shows a growth crystallographic preferential direction as a function of the deposition temperature, in agreement with the appearance of the only E2 optical phonon mode in the Raman spectra. Such findings are compatible with the changes observed in the photoluminescent (PL) optical response and was related to the modification of the ZnO thin film structural quality.
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F. B. ROMERO,J. M. MCWILLIAMS,E. A. FAZIO,F. A. IZQUIERDO 한국자동차공학회 2014 International journal of automotive technology Vol.15 No.6
This paper has been developed in the framework of the alternative beam T-junction solution previouslypropoused by the authors (Alcalá et al., 2013), with the scope of optimizing the behavior of buses and coaches upper structuresmodeled with beam type elements. The alternative beam T-junction model proposed by the authors, had a total of six elasticelements at the junction level allowing to modify the localized rigidity of any modeled T-junctions, therefore improving theirbehavior and avoiding the well known rigidity issue these elements have. A fundamental aspect behind the use of thesealternative beam models is related to the necessity of correctly estimating the rigidity values of the elastic elements for eachmodeled T-junction. In this context, we propose applying a surrogate model for the reference calculations which is based onstatistical Bayesian kriging predictors. Statistical predictions have the added value, with respect to deterministic solutions, ofproviding a quantification of uncertainty. The development of the kriging predictors has required the application of a statisticalmethodology including computer experiment design, computation of moments of inertia, graphical and ANOVA typesensitivity analysis and Monte Carlo computation of Bayesian inference. The results of the application have been a verysatisfactory trade-off between accuracy of approximation (prediction) and computational cost. The surrogate kriging modelsalso provide an useful tool for a better understanding of the input-output relationships involved in the reference computations.
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E. Fazio,E. Piperopoulos,S.H. Abdul Rahim,M. Lanza,G. Faggio,G. Mondio,F. Neri,A.M. Mezzasalma,C. Milone,S. Santangelo 한국물리학회 2013 Current Applied Physics Vol.13 No.4
Pristine and annealed multi-walled C nanotubes are preliminarily tested as catalysts towards the degradation of p-coumaric acid with better performances than the widely used activated carbon. In order to clarify the origin of their different catalytic efficiency, the samples are analysed by means of highresolution transmission electron microscopy, X-ray photoemission, reflection electron energy loss and micro-Raman spectroscopy. Chemical composition, mass density, bonding configurations and threefoldto fourfold-coordinated carbon bonding ratios are determined. The comparative discussion of the results obtained leads to attribute the higher catalytic activity of the pristine nanotubes to their larger sp2/sp3carbon bonding fraction and greater amount of oxygen containing functional groups
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An AzTEC 1.1-mm survey for ULIRGs in the field of the Galaxy Cluster MS 0451.6−0305
Wardlow, J. L.,Smail, Ian,Wilson, G. W.,Yun, M. S.,Coppin, K. E. K.,Cybulski, R.,Geach, J. E.,Ivison, R. J.,Aretxaga, I.,Austermann, J. E.,Edge, A. C.,Fazio, G. G.,Huang, J.,Hughes, D. H.,Kodama, T.,K Blackwell Publishing Ltd 2010 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.401 No.4
<P>ABSTRACT</P><P>We have undertaken a deep (σ∼ 1.1 mJy) 1.1-mm survey of the <I>z</I>= 0.54 cluster MS 0451.6−0305 using the AzTEC camera on the James Clerk Maxwell Telescope. We detect 36 sources with signal-to-noise ratio (S/N) ≥ 3.5 in the central 0.10 deg<SUP>2</SUP> and present the AzTEC map, catalogue and number counts. We identify counterparts to 18 sources (50 per cent) using radio, mid-infrared, <I>Spitzer</I> InfraRed Array Camera (IRAC) and Submillimetre Array data. Optical, near- and mid-infrared spectral energy distributions are compiled for the 14 of these galaxies with detectable counterparts, which are expected to contain all likely cluster members. We then use photometric redshifts and colour selection to separate background galaxies from potential cluster members and test the reliability of this technique using archival observations of submillimetre galaxies. We find two potential MS 0451−03 members, which, if they are both cluster galaxies, have a total star formation rate (SFR) of ∼100 M<SUB>⊙</SUB> yr<SUP>−1</SUP>– a significant fraction of the combined SFR of all the other galaxies in MS 0451−03. We also examine the stacked rest-frame mid-infrared, millimetre and radio emission of cluster members below our AzTEC detection limit, and find that the SFRs of mid-IR-selected galaxies in the cluster and redshift-matched field populations are comparable. In contrast, the average SFR of the morphologically classified late-type cluster population is nearly three times less than the corresponding redshift-matched field galaxies. This suggests that these galaxies may be in the process of being transformed on the red sequence by the cluster environment. Our survey demonstrates that although the environment of MS 0451−03 appears to suppress star formation in late-type galaxies, it can support active, dust-obscured mid-IR galaxies and potentially millimetre-detected LIRGs.</P>
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