Creativity and Learners’ Performance on Argumentative and Narrative Written Tasks

Reza Zabihi,Mohsen Rezazadeh,Dariush Nejad Ansari 아시아영어교육학회 2013 The Journal of Asia TEFL Vol.10 No.1

Competitive adsorption of arsenic and mercury on nano-magnetic activated carbons derived from hazelnut shell

Mojtaba Zabihi,Omidvar Maryam,Alireza Motavalizadehkakhky,Rahele Zhiani 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.2

Magnetic activated carbons (AC) derived from hazelnut shell using the chemical activation method with ZnCl2 and KOH were prepared in the present work. The adsorption performance of the magnetic sorbents was evaluated for the removal of mercury and arsenic ions in the binary solutions, and the interference of ions with each other during the adsorption process was investigated. The synthesized adsorbents were characterized using XRD, FTIR, BET, XRF, FESEM, TGA and VSM. The XRD results indicated that the small iron oxide crystallites, including goethite and magnetite, were detected on the hazelnut shell-based AC activated by ZnCl2. The extended Langmuir and the modified competitive Langmuir isotherms were applied to fit the competitive adsorption of Hg (II) and As (V) ions using genetic algorithm (GA). The experimental data were in good agreement with the extended Langmuir equation, while the correlation coefficient was measured close to 1. The highest adsorption capacity was calculated to be 80 and 39.31 mg/g for mercury and arsenic ions on the magnetic sample activated by ZnCl2, respectively. The kinetic behavior of carbonaceous adsorbents was studied using pseudo-first and second-order models. The effect of various operating conditions was investigated on the competitive adsorption of metal ions.

A novel mathematical method for prediction of rapid expansion of supercritical solution (RESS) processed ibuprofen powder size distribution

Fatemeh Zabihi,Ali Vaziri,Mohammad Mehdi Akbarnejad,Mehdi Ardjmand,Maryam Otadi,Ahmad Reza Bozorgmanesh 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.5

A fundamental understanding of the interplay among the variables involved in a rapid expansion of supercritical solution (RESS) process is necessary in order to achieve control of product within the desired specifications. A model is proposed where the experimental data are fitted to a 2-D Sp-line equation that results in a mathematical pattern matching function that can easily be processed analytically to yield a continuous motion estimate. This model presents a novel promising method to interpolate between any two experimental results. Comparison of the mean particles size values which are calculated as a function of nozzle temperature (TN) and pre-expansion pressure (Ppre-expansion)with the experimental data, results in a ±8% accuracy. The optimum operational point that leads to the minimum mean particles diameter (40 nm) is determined through mathematical optimization of this equation and confirmed experimentally. Furthermore, 600 more values of mean particle size are predicted by varying the nozzle temperature and dissolution pressure and the results are presented in the form of a 3-dimesional curve.

Design of Optimal Slit Steel Damper Under Cyclic Loading for Special Moment Frame by Cuckoo Search

Masoud Zabihi-Samani 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.4

After the Northridge and Kobe earthquakes, several destruction of the structural beams were occurred. The diffi culty and cost-eff ectiveness of beam replacement after earthquakes is a major problem on steel structures. For this purpose, the idea of using replaceable connection is suggested. A slit steel damper (SSD) is introduced that leads to the further energy damping and the ability to move the plastic joint outside of structural elements. The stiff ness and damping characteristics of SSD is related to the thickness, height and number of sheets of the damper. The usage of SSD is more progressive and at the same time, the optimal design of SSDs should be proposed to meet the economical criterion and the reduction of the stress and defl ection. In this study, an optimal SSD connection is proposed to enhance the performance of the classical SSD connection to meet the criterion of AISC to utilize in special moment frames. The results demonstrated that increasing the thickness and reduction of the steel sheets in the damper had a greater eff ect on the performance of the SSD connection, in comparison with the increase in the number of sheets. Therefore, the Cuckoo Search (CS) was utilized to optimize the several SSD parameters. Furthermore, a comparison between the CS-SSD and Reduced Beam Section (RBS) which is known as a common moment steel fi xed-connection was accomplished. Results indicate that CS-SSD connection can reach the same function as the RBS connections under cycling loadings, in addition to the easy replacement capability after seismic excitations. The performance of the proposed CS optimization algorithm in designing of the optimal SSD was compared with the traditional Genetic Algorithm and the particle swarm optimization (PSO) with considering several designing constraints. High capabilities of the proposed CS optimization algorithm in terms of weight, energy absorption, stiff ness and bearing capacity of SSD connections are simultaneously clarifi ed by the results.

Design procedure for seismic retrofit of RC beam-column joint using single diagonal haunch

Alireza Zabihi,Hing-Ho Tsang,Emad F. Gad,John L. Wilson 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.71 No.4

Exterior beam-column joint is typically the weakest link in a limited-ductile reinforced concrete (RC) frame structure. The use of diagonal haunch element has been considered as a desirable seismic retrofit option for reducing the seismic demand at the joint. Previous research globally has focused on implementing double haunches, while the use of single haunch element as a less-invasive and more architecturally favorable retrofit option has not been investigated. In this paper, the key formulations and a design procedure for the single haunch system for retrofitting RC exterior beam-column joint are developed. An application of the proposed design procedure is then illustrated through a case study.

Application of supported TiO2 onto Iranian clinoptilolite nanoparticles in the photodegradation of mixture of aniline and 2, 4-dinitroaniline aqueous solution

Hamidreza Zabihi-Mobarakeh,Alireza Nezamzadeh-Ejhieh 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-

Clinoptilolite nanoparticles (NCP) were used to increase the photocatalytic activity of TiO2 in the photodegradation of mixture of aniline (AN) and 2, 4-dinitroaniline (DNAN) aqueous solution. The photocatalyst was prepared via calcinations process followed by the ion exchanging of NCP in 0.1 M of ammonium titanyl oxalate monohydrate. Samples were characterized by FT-IR, XRD, DRS and SEM. The degradation extent of the pollutants was calculated by changes in the UV–vis absorbencies of the pollutants at lmax 280 nm for AN and 360 nm for DNAN. The optimal conditions were as: 10 ppm with respect to each pollutant, pH 5.8, catalyst dose of 0.1 g L1 and contact time of 6 h.

Simple Shear Extrusion of Al/Al2O3 Composite Prepared by Stir Casting and Hot Forging

Majed Zabihi,Fathallah Qods,Esmaeil Emadoddin 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.1

In this study, aluminum/alumina composites with 3 and 5 vol% reinforcement particles were manufactured via stir castingand hot forging; they were severely deformed by the simple shear extrusion (SSE) technique. Three SSE dies with differentdistortion angles were utilized in this work. The SSE-ed samples with α = 22.5° were then fractured after one pass, whileSSE-ed samples with α = 8 and 10° were deformed up to thirteen passes, successfully. Microstructural evolution, porositypercentage and micro hardness parameters were investigated after each process. Shear punch test was then used to evaluatethe mechanical properties. Additionally, the applied force and stress/strain distributions were evaluated by the finite elementmethod (FEM) code via ABAQUS® simulation software in different passes. Moreover, the effect of the SSE process on thefracture behavior of the commercial Al and aluminum matrix composite was studied. The results showed that the effectivestrain was increased with increasing the number of SSE passes and distortion angles, while the applied force was decreasedwith increasing the number of passes. Microstructure, bonding quality, hardness and porosity percentage were also improvedby using forging and SSE processes. During the process, ultimate shear strength was enhanced with increasing the amountsof effective strain; also, shear elongation percentage was decreased. Further, SEM observations showed that the fracturemode in the SSE-ed commercial Al sample was a typical ductile one, whereas the fracture mode was nearly shear ductilewith more flat surfaces in the Al-5 vol% Al2O3specimens.

Definitions, Concepts and New Directions in Industrialized Building Systems (IBS)

Hossein Zabihi,Farah Habib,Leila Mirsaeedie 대한토목학회 2013 KSCE Journal of Civil Engineering Vol.17 No.6

Nowadays, industrialization of construction is important due to increase in quality, mass production and etc. This subject is much discussed in periods of time from various points of view, so it has various definitions and concepts in each period by changing trends in and views to industrialization. The main objective of this paper is to study new directions of industrialization in construction,which leads to discuss contemporary and progressive trends of this subject, so this paper offers a background for the subject of industrialization. In this paper, new definitions and attitudes are presented by comprehensive review of previous researches with an explanatory and analytical method to extract new directions in building industrialization; also questionnaires and interviews are used to extract criteria and suggestions of new directions. The directions have been discussed in three sections, requirements (quality and economical advantages), social trends and sustainability; so contemporary industrialized building systems are focused on sustainability as a new comprehensive direction. For sustainability direction a conceptual model is presented to explain the Sustainable Industrialized Building Systems (SIBS) as a new trend and presenting some practical suggestions.

Comparison of the blocked-off and embedded boundary methods in radiative heat transfer problems in 2D complex enclosures at radiative equilibrium

Milad Zabihi,Khosro Lari,Hossein Amiri 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.7

Radiative heat transfer in participating media at radiative equilibrium in two-dimensional complex geometries will be investigated using two Cartesian boundary treatments, i.e. the blocked-off method and the embedded boundary method. The main advantages of Cartesian formulation are to simplify grid generation and using efficient Cartesian solvers for complicated problems. Angular and spatial discretization of the radiative transfer equation are performed using the discrete ordinates method and the finite volume method, respectively. The accuracy of both methods in solution of radiative heat transfer problems in irregular geometries are verified by comparison with benchmark solutions from literatures. Then, in order to investigate all features of the blocked-off and embedded boundary methods, two radiative problems with complex enclosures that contain gray absorbing and emitting medium at radiative equilibrium are examined. The results obtained from the two methods are compared with each other as well as with results obtained by body-fitted grid system. It has been shown that for a medium at radiative equilibrium with Cartesian formulation, the embedded boundary method is the method of choice, especially for calculations near the complex boundaries. It should be noted that for optically thick media, both blocked-off and embedded boundary methods show poor performance.

Design, Characterization and Performance of the Modified Chitosan–Alumina Nanocomposites for the Adsorption of Hydroquinone and Arsenic (V) Ions

Noormohammadi Maryam,Zabihi Mohammad,Faghihi Morteza 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.5

The aim of this study was to prepare the well-dispersed modifi ed chitosan–alumina (CA) with size less than 50 nm by the facile synthesis method to evaluate the adsorption of hydroquinone and arsenic (V) ions in the aqueous solutions. Derived gamma-alumina from boehmite was coated and modifi ed by chitosan and sodium dodecyl sulfate (SDS) and salicylic acid, respectively. The characterization of nanocomposites was studied by XRD, FTIR, FESEM, EDX TEM and BET analysis. The chitosan and SDS phases were detected in the structure of the adsorbent as confi rmed by XRD achievements. A quadratic polynomial model was developed to describe the eff ect of the operating parameters including pH, temperature and initial concentration on the adsorption capacity of the prepared sample while the experimental data were designed by a response surface method (RSM). The maximum adsorption capacity for the best adsorbent named CSAS3 was measured to be 86.95 and 95.24 mg/g for HQ and As (V) ions by employing linear Langmuir equation, respectively. The kinetic study indicated that the experimental data were in an appropriate matching with the linearized pseudo-quadratic kinetic equation ( R 2 = 0.999). The results showed the successful removal of hydroquinone and arsenic ions form the aqueous after 5 consecutive cycles.