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Ebrahimi, Farzad,Kokaba, Mohammadreza,Shaghaghi, Gholamreza,Selvamani, Rajendran Techno-Press 2020 Advances in nano research Vol.8 No.2
This study presents the hygro-thermo-electromagnetic mechanical vibration attributes of elastically restrained piezoelectric nanobeam considering effects of beam surface for various elastic non-ideal boundary conditions. The nonlocal Eringen theory besides the surface effects containing surface stress, surface elasticity and surface density are employed to incorporate size-dependent effects in the whole of the model and the corresponding governing equations are derived using Hamilton principle. The natural frequencies are derived with the help of differential transformation method (DTM) as a semi-analytical-numerical method. Some validations are presented between differential transform method results and peer-reviewed literature to show the accuracy and the convergence of this method. Finally, the effects of spring constants, changing nonlocal parameter, imposed electric potential, temperature rise, magnetic potential and moisture concentration are explored. These results can be beneficial to design nanostructures in diverse environments.
An improvement on fuzzy seismic fragility analysis using gene expression programming
Elaheh Ebrahimi,Gholamreza Abdollahzadeh,Ehsan Jahani 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.83 No.5
This paper develops a comparatively time-efficient methodology for performing seismic fragility analysis of the reinforced concrete (RC) buildings in the presence of uncertainty sources. It aims to appraise the effectiveness of any variation in the material’s mechanical properties as epistemic uncertainty, and the record-to-record variation as aleatory uncertainty in structural response. In this respect, the fuzzy set theory, a well-known α-cut approach, and the Genetic Algorithm (GA) assess the median of collapse fragility curves as a fuzzy response. GA is requisite for searching the maxima and minima of the objective function (median fragility herein) in each membership degree, α. As this is a complicated and time-consuming process, the authors propose utilizing the Gene Expression Programming-based (GEP-based) equation for reducing the computational analysis time of the case study building significantly. The results indicate that the proposed structural analysis algorithm on the derived GEP model is able to compute the fuzzy median fragility about 33.3% faster, with errors less than 1%.
MODULE AMENABILITY AND MODULE ARENS REGULARITY OF WEIGHTED SEMIGROUP ALGEBRAS
Asgari, Gholamreza,Bodaghi, Abasalt,Bagha, Davood Ebrahimi Korean Mathematical Society 2019 대한수학회논문집 Vol.34 No.3
For every inverse semigroup S with subsemigroup E of idempotents, necessary and sufficient conditions are obtained for the weighted semigroup algebra $l^1(S,{\omega})$ and its second dual to be $l^1(E)$-module amenble. Some results for the module Arens regularity of $l^1(S,{\omega})$ (as an $l^1(E)$-module) are found. If S is either of the bicyclic inverse semigroup or the Brandt inverse semigroup, it is shown that $l^1(S,{\omega})$ is module amenable but not amenable for any weight ${\omega}$.
Afshin Ebrahimi,Gholamreza Bonyadinejad,Mansour Sarafraz,Mohsen Khosravi,Seyed Mahmood Taghavi-Shahri,Roya Nateghi,Sedighe Rastaghi 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.1
The decolorization and degradation of the synthetic aqueous solution of the Acid Orange 10 (AO10) dye on Ti/PbO2 anode were investigated using the response surface methodology based on central composite design with three variables: current density, pH, and supporting electrolyte concentration. The Ti/PbO2 electrode was prepared by the electrochemical deposition method. The optimum conditions for AO10 decolorization in synthetic dye solution were electrolyte concentration of 117.04 mM, pH of 12.05, and current density of 73.64 mA cm−2. The results indicated that the most effective factor for AO10 degradation was current density. Furthermore, the color removal efficiency significantly increased with increasing current density. To measure AO10 mineralization under optimum conditions, the chemical oxygen demand (COD) and total organic carbon (TOC) removal were evaluated. Under these conditions, decolorization was completed and 63% removal was recorded for COD and 60% for TOC after 100 min of electrolysis.
Mehdi Shaban Ghazani,Beitallah Eghbali,Gholamreza Ebrahimi 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.5
Dynamic recrystallization behavior of AISI 321 austenitic stainless steel were studied using hot compressiontests over the range of temperatures from 900 °C to 1200 °C and strain rates from 0.001 s-1to 1 s-1. The criticalstrain and stress for initiation of dynamic recrystallization were determined by plotting strain hardening ratevs. stress curves and a constitutive equation describing the flow stress at strains lower than peak strain. Also, thestrain at maximum flow softening was obtained and the effect of deformation conditions (Z parameter) on thecritical strain and stress were analyzed. Finally, the volume fraction of dynamic recrystallization was calculated atdifferent deformation conditions using these critical values. Results showed that the model used for predictingthe kinetics of dynamic recrystallization has a great consistency with the data, in the form of θ-ε curves,directly acquired from experimental flow curves.