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RISS 인기검색어
- 검색키워드
- 저자 : A. Hafizi (검색결과 3 건)
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Induced nonlocal electric wave propagation of boron nitride nanotubes
A. Ghorbanpour Arani,A. Hafizi Bidgoli,A. Karamali Ravandi,M. A. Roudbari,S. Amir,M. B. Azizkhani 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.10
Axial displacement and electric wave propagation of single-walled Boron-Nitride nanotubes (SWBNNTs) induced by alternating current (AC) are investigated in this study. A single- walled zigzag structure BNNT is modeled based on nonlocal piezoelasticity theory and Euler-Bernoulli beam (EBB). Equations correspond to lateral displacement have been obtained. Using Hamilton’s principle and considering charge equation for coupling of electrical and mechanical fields, the higher order of governing equations are derived. Analytical solution is applied to solve governing equations. Also the axial and lateral displacement of a SWBNNT and electric potential induced by AC through it are presented. The detailed parametric study is conducted, focusing on the remarkable effects of the half wave number on the behavior of the SWBNNT. The results indicate applying alternating field, leads to propagation of axial displacement along the SWBNNT. Also the result of this study can be useful to design and manufacture of smart micro/nano-electro-mechanical systems in advanced biomechanics applications by controlling axial and lateral displacements.
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A. Hafizi,A. AHMADPOUR,M. Koolivand-Salooki,M.M. Heravi,F.F. Bamoharram 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
Design of experiments (DOE) and artificial neural networks (ANNs) were successfully applied for studying the operating parameters of benzene alkylation with 1-decene over H14[NaP5W30O110]/SiO2catalyst. In this reaction catalyst loading, catalyst weight percent and benzene to 1-decene molar ratio (Bz/C10) were chosen as independent variables in experimental design. Prediction of 1-decene conversion and 2-phenyldecane selectivity was performed applying response surface method (RSM) and ANN models. Final selected multi-layer (3-6-2-2) ANN model resulted a coefficient of determination (R2)of 0.95 for 1-decene conversion and 0.99 for 2-phenyldecane selectivity, while the R2 of RSM was 0.93and 0.92 for these two parameters.
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H.R. Forutan,E. Karimi,A. Hafizi,M.R. Rahimpour,P. Keshavarz 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
In this study, a comparison between the performance of alumina supported Fe, Mn, Co and Cu oxygencarriers has been performed in chemical looping reforming (CLR) of methane. This process is consistingof two stages: ‘air reactor’ and ‘fuel reactor’, in which the oxygen carriers were placed in a fixed bedtubular reactor. Scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-raydiffraction (XRD) were applied to check the carrier specifications before and after the process. Also,response surface method based on central composite design was applied to investigate the operatingconditions including reaction temperature, time and oxygen carrier type. The results showed that theeffective retention time of oxygen carriers varies for different metals in the air and fuel reactors, whichdepends on the amount of adsorption and desorption of oxygen in each stage. Results of theseexperiments revealed that iron based oxygen carrier had the highest resistance against sintering and themaximum capacity for oxygen adsorption among the mentioned carriers. It was also found that copperhad a significant oxygen transport capacity; however its resistance against sintering and agglomerationis relatively low. Finally, Design expert software suggested several optimized solutions; among them thebest choice was obtained to be Fe-based oxygen carrier with reaction temperature and time of1014.13 8C and 50.5 min in the second cycle respectively.
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