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- 저자 : Paolone, Annalisa (검색결과 2 건)
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Haddad, Boumediene,Paolone, Annalisa,Villemin, Didier,Taqiyeddine, Moumene,Belarbi, El-habib,Bresson, Serge,Rahmouni, Mustapha,Dhumal, Nilesh R.,Kim, Hyung J.,Kiefer, Johannes Elsevier 2017 Journal of molecular structure Vol.1146 No.-
<P><B>Abstract</B></P> <P>The reaction of lithium bis(trifluoromethanesulfonyl)imide with tetraphenylphosphonium bromide in water leads to the formation of tetraphenylphosphonium bis(trifluoromethanesulfonyl)imide ([PPh<SUB>4</SUB> <SUP>+</SUP>][(CF<SUB>3</SUB>SO<SUB>2</SUB>)<SUB>2</SUB>N<SUP>−</SUP>]). The obtained compound was identified by means of <SUP>1</SUP>H, <SUP>13</SUP>C, <SUP>19</SUP>F and <SUP>31</SUP>P NMR spectroscopy. Although it has a structure similar to ionic liquids, it exhibits a melting point above 100 °C. Besides describing the synthesis, a detailed characterization of its conductivity and vibrational spectroscopic properties is presented. For the latter, FT-Raman and FTIR/ATR spectroscopies are used in the wavenumber range from 150 to 3500 cm<SUP>−1</SUP> and from 600 to 3500 cm<SUP>−1</SUP>, respectively. Density functional theory calculations reveal a minor influence of the interionic interactions on the vibrational structure. Consequently, the computational vibrational spectra of the isolated ions show a good agreement with the experimental data. A detailed vibrational assignment is presented. Furthermore, the conductivity data indicate a solid-solid phase transition about 130 K below the melting point.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Conductivity data indicate a solid-solid phase transition. </LI> <LI> Interionic interactions play a minor role in the vibrational structure of PPh<SUB>4</SUB> NTf<SUB>2</SUB>. </LI> <LI> Computational and experimental spectra agree well. </LI> </UL> </P>
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Pushover Analyses of Slender Cantilever Bridge Piers with Strength and Ductility Degradation
Paolo Di Re,Davide Bernardini,Daniela Ruta,Achille Paolone 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.2
Reinforced concrete bridge piers are often subject to spatially non-uniform deterioration whichtypically produces strength and ductility degradation. When piers are subject to deterioration, the sectional response is no longer uniform and the determination of the pushover curves from sectional response is no longer immediate. This paper proposes a simplified procedure to accomplish this task for RC bridge cantilever piers. The method is simplified only with respect to geometric nonlinearities and yields an accurate estimate of the ultimate displacement, free of numerical issues typical of fiber-based finite elements. The procedure is based on an iterative approach to enforce the element equilibrium under P-Delta effects induced by vertical loads and can consider arbitrary deterioration patterns through the specification of different moment-curvature response along the elevation. After validating the approach with experimental results, a parametric analysis of the influence of sectional strength and ductility degradation is carried out for the case study of a rectangular hollow RC pier. Results show that significant variations of the pier equivalent plastic hinge length can be expected because of the occurrence of deterioration in the lower part of the pier. Moreover, paper provides quantitative measure of the extent of the strength and ductility degradation.
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