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RISS 인기검색어
- 검색키워드
- 저자 : Mahdi Khodaparast (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Simulation of the Interaction of Micropiles and a Fault Rupture
Mojtaba Alizadeh,Mahdi Khodaparast,Ali M. Rajabi 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.12
Understanding the cause of structural damage and loss caused by surface faulting rupture requires research on the fault rupture–foundation interaction and geotechnical mitigation methods. The present study investigated the interaction of reverse-faulting surface rupture and a foundation system comprising a mat foundation and micropiles. The effects of the micropiles on the rotation of the foundation and rupture propagation was examined for different interaction mechanisms. The results suggested that the response was sensitive to the position of the foundation micropiles. It was found that the position of the foundation–micropile system relative to the rupture determined the type of interaction between the soil, rupture, micropiles, and foundation, which is significant for development of geotechnical mitigation methods.
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Reza Darisavi Bahmanshir,Mahdi Khodaparast Mashhadi,Ali Akbar Naji Meidani,Narges Salehnia 대한산업공학회 2018 Industrial Engineeering & Management Systems Vol.17 No.3
The present study seeks to investigate the oil demand function reversibility of the Iran oil importing countries, taking into account the effect of technology and environmental constraints on the demand of the mentioned countries. In order to reach this goal, the present study evaluated two symmetrical and asymmetric adjustments for oil demand of Iran oil importing countries using data of 1970-2014 period for Iran oil importing countries including France, Germany, Greece, Italy, Japan, Poland, Spain, Turkey, the United Kingdom, South Korea, Czech Republic, the Netherlands and Belgium, Russia, South Africa, China and India. As there was a co-integrated relationship among the variables of mentioned crosssections, Fully Modified Ordinary Least Squares (FMOLS) method of Panel data approach was applied. According to the results of this research, the oil price increase has a negative and significant effect and GDP has a positive and significant effect on the Iran oil importing countries in symmetric and asymmetric models. Through the application of FMOLS cointegrated panel data approach, oil demand of Iran oil importing countries is irreversible. Moreover, R&D as the technology indicator and lag of CO2 as environmental constraints have a significant effect. In one hand, ignoring environmental considerations and pollution increasing in the mentioned countries will decrease the oil demand of Iran and on the other hand, technology indicator and applying modern ones will decrease the oil demand of Iran, too. According to the irreversibility for oil demand of Iran oil importing countries and Iran dependency on oil revenues, it should be attentive in selecting oil importing countries for sustainable source of revenue. The importance of environmental considerations and technological improvements of oil importing countries will be impressive for energy policy makers.
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Mostafa Mohammadi,Ali M. Rajabi,Mahdi Khodaparast 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.1
The effect of nano-CaCO3 on the geotechnical properties of clayey sand (SC) soil was investigated. SC soil containing 10%, 20% and 30% clay and 0.3%, 0.7%, 1.1% and 1.5% nano-CaCO3 were cured for 7, 14 and 28 days and then subjected to uniaxial compression testing. The experimental results were analyzed numerically by the group method of data handling using an artificial neural network. Crystalline phases were analyzed by x-ray diffraction (XRD) to study the microstructure of soil specimens improved with nano-CaCO3. The addition of nano-CaCO3 to SC specimens, especially those with lower clay contents, increased their uniaxial compressive strength and the compressive strength increased over time. An optimum nano-CaCO3 level of 0.7% was determined for soil containing 10% and 20% clay and 1.1% for soil containing 30% clay. The results indicated a decrease in deformation and increase in stiffness of the soil with the addition of nano-CaCO3. The effect of nano-CaCO3 on the ultimate compressive strength of the soil in the XRD patterns indicated an increase in the recrystallization of the particles. Numerical analysis of the experimental results found a correlation for predicting the uniaxial compressive strength of the improved SC soil with a mean error of 4%.
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