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Abdelkader Karas,Mohamed Bouzit,Mustapha Belarbi,Redha Mazouzi 국제구조공학회 2015 Steel and Composite Structures, An International J Vol.19 No.6
This paper presents a contribution to improving an analytical thermo-mechanical modeling of Oxley's machining theory of orthogonal metals cutting, which objective is the prediction of the cutting forces, the average stresses, temperatures and the geometric quantities in primary and secondary shear zones. These parameters will then be injected into the developed model of Karas et al. (2013) to predict temperature distributions at the tool-chip-workpiece interface. The amendment to Oxley's modified model is the reduction of the estimation of time-related variables cutting process such as cutting forces, temperatures in primary and secondary shear zones and geometric variables by the introduction the constitutive equation of Johnson-Cook model. The model-modified validation is performed by comparing some experimental results with the predictions for machining of 0.38% carbon steel.
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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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