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Vibration response of smart concrete plate based on numerical methods
Reza Taherifar,Farhad Chinaei,Shahram Ghaedi Faramoushjan,Mohammad Hossein Nasr Esfahani,Shabnam Nasr Esfahani,Maryam Mahmoudi 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.23 No.4
This research deals with the vibration analysis of embedded smart concrete plate reinforced by zinc oxide (ZnO). The effective material properties of structure are considered based on mixture rule. The elastic medium is simulated by orthotropic visco-Pasternak medium. The motion equations are derived applying Sinusoidal shear deformation theory (SSDT). The differential quadrature (DQ) method is applied for calculating frequency of structure. The effects of different parameters such as volume percent of ZnO, boundary conditions and geometrical parameters on the frequency of system are shown. The results are compared with other published works in the literature. Results indicate that the ZnO have an important role in frequency of structure.
Buckling analysis of concrete plates reinforced by piezoelectric nanoparticles
Reza Taherifar,Maryam Mahmoudi,Mohammad Hossein Nasr Esfahani,Neda Ashrafi Khuzani,Shabnam Nasr Esfahani,Farhad Chinaei 사단법인 한국계산역학회 2019 Computers and Concrete, An International Journal Vol.23 No.4
In this paper, buckling analyses of composite concrete plate reinforced by piezoelectric nanoparticles is studied. The Halphin-Tsai model is used for obtaining the effective material properties of nano composite concrete plate. The nano composite concrete plate is modeled by Third order shear deformation theory (TSDT). The elastic medium is simulated by Winkler model. Employing nonlinear strains-displacements, stress-strain, the energy equations of concrete plate are obtained and using Hamilton's principal, the governing equations are derived. The governing equations are solved based on Navier method. The effect of piezoelectric nanoparticles volume percent, geometrical parameters of concrete plate and elastic foundation on the buckling load are investigated. Results showed that with increasing Piezoelectric nanoparticles volume percent, the buckling load increases.
Preparation and characterization of a novel calcium-conducting polymer inclusion membrane: Part I
Reza Darvishi,Javad karimi Sabet,Mohsen Nasr Esfahany 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.10
The preparation and characterization of a novel type of castor oil-based polymer inclusion membrane (PIM) was investigated, focusing on its flux and selective recovery of Ca2+ over competitive ions such as K+, Na+, and Mg2+. The PIM contains a cross-linked high-molecular-weight green polyol (GPO) as a polymer base, benzene-18crown-6 as a carrier, and an ionic liquid called 1-Butyl-3-methylimidazolium chloride as a plasticizer. GPO was first synthesized by a reaction between an epoxidized castor oil and a cellulose acetate, thereafter, cross-linked by isophorene isocyanate. The base polymer and the prepared PIM were characterized by gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), atomic force microscopy (AFM), thermogravimetric analysis (TGA), and X-ray diffraction (XRD). The FTIR results indicate that oxirane groups in the epoxidized castor oil molecules reacted with the primary hydroxyl groups of cellulose acetate chains. The contact angle measurement hints at the hydrophobic characteristics of the prepared membrane. Compared to the PVC-, CA-, and PVDF-based polymer inclusion membrane, the cured GPO-based PIM, showed higher selectivity and flux of calcium ions with the same composition. The greater stability and significantly higher surface roughness are further favorable features of the novel PIM.
Mohammad Reza Ehsani,Mohammad Mahdi Mardanpour,Roohollah Sadeghi,Mohsen Nasr Esfahany 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.3
A two-phase model for a novel shell and tube fluidized bed membrane reactor has been developed in order to synthesize the dimethyl ether. Due to the hydrogen partial pressure driving force, hydrogen can penetrate from feed synthesis gas, flowing in the shell side, into the reaction side through the membrane. The proposed model has been used to compare the performance of a fluidized bed membrane reactor with the conventional reactors. The effects of different parameters on the dimethyl ether production and CO conversion were investigated. The results show an increase in DME production and CO conversion by permeation of hydrogen.