Application of an optimized modified stir bar with ZnS nanoparticles loaded on activated carbon for preconcentration of carbofuran and propoxur insecticides in water samples and their HPLC determination
Khodadoust S.,Behbahan Khatam Alanbia University of Technology |
Toori M.A.,Yasuj University of Medical Sciences |
Talebianpoor M.S.,Yasuj University of Medical Sciences
RSC Advances | Year: 2016
In this study, the stir bar was coated with ZnS-NPs loaded on activated carbon (AC) (ZnS-AC) as well as 1-ethyl-3-methylimidazolium hexafluorophosphate ([EMIM][PF6]) ionic liquid (IL) using a sol gel technique which was used for stir bar sorptive extraction (SBSE) of carbofuran and propoxur. The extracted analytes were then quantified by high performance liquid chromatography (HPLC) equipped with an ultra violet detector. The best extraction performance for carbofuran and propoxur was obtained through the optimization of the factors affecting SBSE including the pH of the sample solution, ionic strength, extraction time, volume of desorption solvent, desorption time, and stirring speed. The fractional factorial design (FFD) was used to find the most important factors, which were then optimized by the central composite design (CCD) and the desirability function (DF). Under the optimal experimental conditions, the proposed method has linear ranges over 0.002-30 μg mL-1 with detection limits of 0.0003-0.0005 μg mL-1 and good RSDs (and n = 6) of 3.3-4.5% with the enrichment factors (EFs) in the range of 75.6-81.6-fold for carbofuran and propoxur. The developed method has been successfully applied to the determination of two N-methylcarbamate in environmental water samples such as tap water, river water, and mineral water. © 2016 The Royal Society of Chemistry.
Heidari A.,Zayandab Consulting Engineers Company |
Gharehbaghi S.,Behbahan Khatam Alanbia University of Technology
Earthquake Engineering and Structural Dynamics | Year: 2015
Nowadays, one of the most important methodologies to reduce the destructive effects of severe earthquakes on structures is the use of energy dissipation devices (EDDs). In this paper, a new configuration of special truss moment frame (STMF) systems including EDDs is theoretically proposed to improve their seismic performance. Such an improvement is achieved by provision of bending performance in these frames. For this purpose, the devices called buckling resistant braces (BRBs) are located at the side of beam-column connections as the top and bottom members of truss-girders. In this context, a five-bay nine-story STMF is designed using the damage and energy concepts recently proposed in the literature. To show the effectiveness of the proposed system with respect to the similar recently presented STMFs, this frame is then subjected to non-linear static and non-linear time-history analyses under several ground motion records in order to survey on its seismic performance. Subsequently, such engineering demand parameters as lateral displacement, inter-story drift ratio, overturning moment and shearing forces of stories, residual deformations and maximum time-history displacement at roof level, as well as the process of plastic hinges formation are investigated. The results show the effectiveness of proposed configuration of EDDs used to improve the seismic safety of STMFs. © 2014 John Wiley & Sons, Ltd.
Albadi J.,Behbahan Khatam Alanbia University of Technology |
Shiran J.A.,Guilan University |
Mansournezhad A.,Islamic Azad University at Gachsaran
Journal of Chemical Sciences | Year: 2014
A CuO-CeO2 nanocomposite in the presence of amberlite-supported azide has been used for the click synthesis of 1,4-disubstituted-1,2,3-triazoles in good yields. This catalyst can be reused several times without any significant decrease in the catalytic activity © Indian Academy of Sciences.
Safdarian R.,Behbahan Khatam Alanbia University of Technology
Mechanics Research Communications | Year: 2015
Abstract The Marciniak and Kuczynski (M-K) model for necking prediction in sheet metal forming was based on the in-plane forming. Bending which was resulted from out-of-plane forming was not considered in the M-K model. Whereas most of the sheet metal forming processes and also standard test of hemispherical punch for forming limit diagram are out-of-plane forming, it is important to consider bending effect in the M-K model. Therefore, in this study bending strain is added to stretching strain of M-K model and a new model is presented for forming limit diagram (FLD) prediction. This modified M-K (MM-K) model is written in the python programming language and it is used as a post-processing criterion for FLD prediction in the commercial software Abaqus. The MM-K model was used to predict FLD and weld line movement in the tailor welded blank forming. It was found that the predicted results by MM-K model are in a good agreement with experimental data. © 2015 Elsevier Ltd.
Safdarian R.,Behbahan Khatam Alanbia University of Technology
Ironmaking and Steelmaking | Year: 2016
In the present study, the influences of strength ratio (SR) are studied on the formability and forming limit diagram (FLD) of tailor-welded blanks (TWBs). AISI 340, St 12 and St 14 steel sheets with equal thickness of 1 mm were used as different kinds of steel to make TWB with different SR. TWBs were obtained by CO2 laser welding of different steel sheets. Limit strength ratio (LSR) is introduced as a new useful factor to predict the FLD of TWB with different SR. Results of this research show that with increasing of difference of TWB’s SR and LSR, formability and the level of FLD will decrease. By SR increasing, limit dome height decreases and some defects such as weld line movement increase. The experimental findings show that the SR of TWB can effect on the position of fracture in the TWB products. © 2016 Institute of Materials, Minerals and Mining
Zirkohi M.M.,Behbahan Khatam Alanbia University of Technology |
Lin T.-C.,Feng Chia University
Nonlinear Dynamics | Year: 2015
This paper presents a novel interval type-2 fuzzy-neural network indirect adaptive sliding mode control (SMC) approach (T2FNNAS) for a suspension system including actuator dynamics. It is equipped with a novel moving sliding surface in which the slope and intercept of sliding surface are simultaneity adjusted by adaptive interval T2FNN to improve controller robustness against system uncertainties and unknown disturbances. As a result, the drawbacks of the conventional SMC, such as chattering effect and a required priori knowledge of the bounds of uncertainties, are removed. Based on the Lyapunov synthesis approach, the free parameters of the adaptive FNN are tuned on-line. One advantage of the proposed approach is that, by incorporating the Lyapunov design approach and SMC method into the adaptive fuzzy-neural control scheme to derive the control law, the proposed approach not only assures closed-loop stability but also achieves a good performance for the overall system. Another advantage of the proposed method is that to relax the requirement for the bound of approximation error, and an estimation mechanism is also employed to observe the bound of it real time. Design of the control system consists of two interior loops. The inner loop is a force control of the hydraulic actuator, while the outer loop is position controller that use T2FNNAS. Finally, a comparison between the proposed approach and a robust model reference adaptive control approach is provided. Simulation results confirm that the proposed approach effectively improves both the passenger comfort and the ride quality of the car. © 2014, Springer Science+Business Media Dordrecht.
Aberoumand A.,Behbahan Khatam Alanbia University of Technology
Pakistan Journal of Biological Sciences | Year: 2012
Processing made fish less susceptible to spoilage. Fish are rich in protein content but the protein content is reduced with processing gave a better result when long-time preservation was carried out. Aim of this study was comparison of proximate analysis of some fresh and processed seafoods. Raw materials and processed seafoods (canned mackerel tuna, frozen Sea-Bream and Pressed caviar) were obtained from different firms and analyzed. Analysis carried out according AOAC methods. Moisture, protein and fat values of tuna fish were estimated to be 51, 23.9 and 21.4%, respectively. In this study, moisture content of pressed caviar was 36%, protein content was 34.4% and fat content was 16.7%, carbohydrate and energy values were 4.9% and 316 kcal/100 g, respectively. Pressed and smoked seafoods contained lower amount of moisture but higher amounts of the other components than raw materials (p<0.05). Canned mackerel tuna, frozen sea bream and pressed caviar also contained higher amounts of fat, carbohydrate and energy, respectively (p<0.05) than raw material. Except canning with water, all processing technologies decreased the moisture content but increased energy values (p<0.05) of the fish. It is concluded that processed seafoods are rich in chemical components and very nutritive. Canned tuna with salted water may be advised for low-calorie diets. Caviar pressed was one the best sea foods that was produced in Iran. Since fishes are consumed as a major protein source in food, it is very important that the protein content should not be compromised during table preparation. © 2012 Asian Network for Scientific Information.
Safdarian R.,Behbahan Khatam Alanbia University of Technology |
Moslemi Naeini H.,Tarbiat Modares University
Thin-Walled Structures | Year: 2015
Cold roll forming is one of the complex forming processes which quality of products is highly dependent on the process parameters. In this study the effect of some roll forming parameters of channel section are investigated on the edge longitudinal strain and bow defect of products. These parameters are bending angle increment, strip thickness, flange width of section, web width of section, friction in the roll and strip contact, speed of roll, and distance between the roll stands. It is important to consider these parameters for roll forming process design. Longitudinal bow is one of the main defects in the cold roll forming products which is affected by the bending angle increment. Experimental and numerical results of this study show that bow defect increase with the bending angle increasing. Results of present study show that peak of longitudinal strain in the edge of channel section increases with the bending angle increment and strip thickness increase, but decreases with the flange width, web width and distance between the roll stands increasing. Results show that friction in the roll-strip contact and speed of roll stand does not have any effect on the edge longitudinal strain. © 2015 Elsevier Ltd. All rights reserved.
Gharehbaghi S.,Behbahan Khatam Alanbia University of Technology |
Khatibinia M.,Birjand University
Earthquake Engineering and Engineering Vibration | Year: 2015
A reliable seismic-resistant design of structures is achieved in accordance with the seismic design codes by designing structures under seven or more pairs of earthquake records. Based on the recommendations of seismic design codes, the average time-history responses (ATHR) of structure is required. This paper focuses on the optimal seismic design of reinforced concrete (RC) structures against ten earthquake records using a hybrid of particle swarm optimization algorithm and an intelligent regression model (IRM). In order to reduce the computational time of optimization procedure due to the computational efforts of time-history analyses, IRM is proposed to accurately predict ATHR of structures. The proposed IRM consists of the combination of the subtractive algorithm (SA), K-means clustering approach and wavelet weighted least squares support vector machine (WWLS-SVM). To predict ATHR of structures, first, the input-output samples of structures are classified by SA and K-means clustering approach. Then, WWLS-SVM is trained with few samples and high accuracy for each cluster. 9- and 18-storey RC frames are designed optimally to illustrate the effectiveness and practicality of the proposed IRM. The numerical results demonstrate the efficiency and computational advantages of IRM for optimal design of structures subjected to time-history earthquake loads. © 2015, Institute of Engineering Mechanics, China Earthquake Administration and Springer-Verlag Berlin Heidelberg.
Zirkohi M.M.,Behbahan Khatam Alanbia University of Technology
Open Engineering | Year: 2015
The purpose of this paper is to improve theVelocity Update Relaxation Particle Swarm Optimization algorithm (VURPSO). The improved algorithm is called Adaptive VURPSO (AVURPSO) algorithm. Then, an optimal design of a Proportional-Integral-Derivative (PID) controller is obtained using the AVURPSO algorithm. An adaptive momentum factor is used to regulate a trade-off between the global and the local exploration abilities in the proposed algorithm. This operation helps the system to reach the optimal solution quickly and saves the computation time. Comparisons on the optimal PID controller design confirm the superiority of AVURPSO algorithm to the optimization algorithms mentioned in this paper namely the VURPSO algorithm, the Ant Colony algorithm, and the conventional approach. Comparisons on the speed of convergence confirm that the proposed algorithm hasa faster convergence in a less computation time to yield a global optimum value. The proposed AVURPSO can be used in the diverse areas of optimization problems such as industrial planning, resource allocation, scheduling, decision making, pattern recognition and machine learning. The proposed AVURPSO algorithm is efficiently used to design an optimal PID controller. © 2015 Majid Moradi Zirkohi.