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RISS 인기검색어
- 검색키워드
- 저자 : Masoud Jamshidi (검색결과 5 건)
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Multi-objective optimization of tapered tubes for crashworthiness by surrogate methodologies
Masoud Asgari,Alireza Babaee,Mohammadamin Jamshidi 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.27 No.4
In this paper, the single and multi-objective optimization of thin-walled conical tubes with different types of indentations under axial impact has been investigated using surrogate models called metamodels. The geometry of tapered thin-walled tubes has been studied in order to achieve maximum specific energy absorption (SEA) and minimum peak crushing force (PCF). The height, radius, thickness, tapered angle of the tube, and the radius of indentation have been considered as design variables. Based on the design of experiments (DOE) method, the generated sample points are computed using the explicit finite element code. Different surrogate models including Kriging, Feed Forward Neural Network (FNN), Radial Basis Neural Network (RNN), and Response Surface Modelling (RSM) comprised to evaluate the appropriation of such models. The comparison study between surrogate models and the exploration of indentation shapes have been provided. The obtained results show that the RNN method has the minimum mean squared error (MSE) in training points compared to the other methods. Meanwhile, optimization based on surrogate models with lower values of MSE does not provide optimum results. The RNN method demonstrates a lower crashworthiness performance (with a lower value of 125.7% for SEA and a higher value of 56.8% for PCF) in comparison to RSM with an error order of 10<sup>-3</sup>. The SEA values can be increased by 17.6% and PCF values can be decreased by 24.63% by different types of indentation. In a specific geometry, higher SEA and lower PCF require triangular and circular shapes of indentation, respectively.
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Jamshidi Fariba,Gholivand Mohammad-Bagher,Amiri Masoud 한국물리학회 2022 Current Applied Physics Vol.37 No.-
Here, we report on a facile green and scalable method for the fabrication of porous 3D graphene as a well-known carbon-based material used in many energy storage devices. Chicken red blood cells were used as sheets spacer and heteroatom sources in the construction of 3D graphene. First, the red blood cells were separated from the blood and mixed with graphene oxide. Then, the mixture was freeze-dried and carbonized at 700 ◦C. The resulted 3D graphene containing heteroatoms was used as a supercapacitor electrode modifier on a glassy carbon electrode and tested with various electrochemical techniques. The supercapacitor electrode showed a specific capacitance of 330 F g-1 at a current density of 1 A g-1, maximum power density of 1958 W kg-1, and maximum energy density of 85 Wh kg-1. Furthermore, the supercapacitive performances were tested in a two-electrode symmetrical system which exhibited a specific capacitance of 238 F g-1 for 1 A g-1. It also showed a power density of 2200 W kg-1 and an appreciable energy density of 160 Wh kg-1. The excellent electrochemical behavior of 3D graphene indicates the promising abilities of the composite for other applications such as biosensors, batteries, electrocatalysts, etc.
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Parastoo Jamshidi,Davood Ghanbari,Masoud Salavati-Niasari 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
In this work, cellulose acetate-La(OH)3 nanocomposites were synthesized via two different in situ and ex situ sonochemical methods. At ex situ firstly lanthanum hydroxide nanostructures were synthesized via sonochemical reaction. The effect of different parameters such as power, time, and surfactants on the morphology of La(OH)3 nanostructures was investigated. Nanostructures were characterized by XRD and SEM. The influence of La(OH)3 nanostructures on the flame retardancy of the cellulose acetate matrix was studied using UL-94 analysis. The enhancement of fame retardancy of nanocomposite is due to endothermically decomposition of La(OH)3 that absorbs energy and simultaneously releases of water.
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Davood Ghanbari,Masoud Salavati-Niasari,Mahdiyeh Esmaeili-Zare,Parastoo Jamshidi,Farshad Akhtarianfar 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Copper sulfide nanoparticles were synthesized via a novel hydrothermal reaction between Cu(NO3)2 4H2O and thioglycolic acid. Thioglycolic acid is used as sulfur source and capping agent simultaneously. CuS nanoparticles were then added to acrylonitrile–butadiene–styrene (ABS) copolymer. The thermal stability behavior of ABS filled with copper sulfide nanoparticles was investigated by thermogravimetric analysis (TGA). Nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy and atomic force microscopy (AFM). The flame retardancy behavior of ABS–CuS was studied by UL-94 analysis.
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Reza Ghamarpoor,Akram Fallah,Masoud Jamshidi,Somayeh Salehfekr 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-
Design of a Z-scheme heterojunction structure is eco-friendly due to its multi-nanocatalyst performanceslike wastewater treatment, antibacterial and electrochemical activity. Herein, Ag was extracted fromwaste batteries in a nitric acid leaching manner. Also, WO3 nanorods and WO3-CeO2 were synthesizedby the surfactant-assisted hydrothermal acidic and sol–gel methods, respectively. Silver nanoparticleswere doped by wet impregnation method to prepare ternary (Ag@WO3-CeO2) and binary (Ag@WO3and Ag@CeO2) heterojunctions. The band gap of the prepared Ag@WO3-CeO2 was remarkably diminishedin comparison with the rest of the sample (from 2.73 to 2.59 eV). The Langmuir-Hinslewood modelshowed that ternary systems can degrade methylene blue twice as much as WO3-CeO2 and seven timesmore than single-component systems. This was due to the presence of silver as a mediator for the transferof photogenerated electrons between two semiconductors. Also, methylene blue was degraded by morethan 90.8% efficiency. Electrochemical impedance spectroscopy (EIS) analysis confirmed that the chargetransfer resistance of Ag@WO3-CeO2 was decreased by more than 50%. The results of bactericidal activenessconfirmed elevated inhibition capability of Ag@WO3-CeO2 towards E.coli with 99% degradation. Xrayfluorescence (XRF) results confirmed that 98% of silver can be re-extracted after 5 photocatalytic useswhich is a material with green technology.
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