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RISS 인기검색어
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- 저자 : Mohammad Farsi (검색결과 5 건)
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Mohammad Ali Farsi 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.4
Reliability analysis is very important in a practical engineering system. As these systems in space industry such as spacecraft and satellite are used to increase analysis accuracy, the system should be modeled carefully. Since the systems can impress the mission succession. In the real world, usually systems have multilevel performance and components have multimode failures. But often the binary-state model is used to determination of the reliability of the system. Although, the binary-state is simple and useful, so it cannot capture real states of a system. Therefore, calculation accuracy is decreased and mission risk is increased. Especially, if functions and operations in a mission or a system have a dependency, for example, the operations sequentially were occurred. The solar array mechanism is an important sub-system in a satellite, since if this system is failed, power generation may be stopped and satellite is failed. In this paper, a new method is proposed to model and assess reliability via the Universal generating function (UGF) for a solar array mechanism. The capability of this model for evaluation and determination of the reliability of the solar array mechanism as the multi-state system is shown, that subsystems/components work in a logical order or sequence. In comparison to Boolean algebra and crude Monte Carlo methods, the accuracy of this method is acceptable.
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Farsi, Mohammad,Ghadimi, Parviz The Society of Naval Architects of Korea 2014 International Journal of Naval Architecture and Oc Vol.6 No.3
Main aim of this paper is to find the best combination of numerical schemes for 2-D SPH simulation of wedge water entry. Diffusion term is considered as laminar, turbulent, and artificial viscosity. Density filter that seriously affects the pressure distribution is investigated by adopting no filter, first order filter, and second order filter. Validation of the results indicates that turbulent model and first order density filter can lead to more reasonable solutions. This simulation was then conducted for wedge water entry with wide range of deadrise angles including 10 degrees, 20 degrees, 30 degrees, 45 degrees, 60 degrees and 81 degrees, with extreme deadrise angles of 10 degrees, 60 degrees and 81 degrees being considered. Comparison of SPH results with BEM solutions has displayed favorable agreement. In two particular cases where experimental data are available, the SPH results are shown to be closer to the experiments than BEM solution. While, accuracy of the obtained results for moderate deadrise angles is desirable, numerical findings for very small or very large deadrise angles are also very reasonable.
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Mohammad Farsi,Parviz Ghadimi 대한조선학회 2014 International Journal of Naval Architecture and Oc Vol.6 No.3
Main aim of this paper is to find the best combination of numerical schemes for 2-D SPH simulation of wedge water entry. Diffusion term is considered as laminar, turbulent, and artificial viscosity. Density filter that se-riously affects the pressure distribution is investigated by adopting no filter, first order filter, and second order filter. Validation of the results indicates that turbulent model and first order density filter can lead to more reasonable solutions. This simulation was then conducted for wedge water entry with wide range of deadrise angles including 10 degrees, 20 degrees, 30 degrees, 45 degrees, 60 degrees and 81 degrees, with extreme deadrise angles of 10 degrees, 60 degrees and 81 degrees being considered. Comparison of SPH results with BEM solutions has displayed favorable agreement. In two particular cases where experimental data are available, the SPH results are shown to be closer to the experiments than BEM solution. While, accuracy of the obtained results for moderate deadrise angles is desirable, numerical findings for very small or very large deadrise angles are also very reasonable.
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Sly-miR166 and Sly-miR319 are components of the cold stress response in Solanum lycopersicum
Ehsan Valiollahi,Mohammad Farsi,Amin Mirshamsi Kakhki 한국식물생명공학회 2014 Plant biotechnology reports Vol.8 No.4
MicroRNAs (miRNAs) are a class of smallendogenous non-coding RNAs that modulate geneexpression in both plants and animals and are involved inseveral biological processes, ranging from organ differentiationto biotic and abiotic stress responses. We identifiedtwo cold stress response microRNAs that showed differentialexpression in Solanum lycopersicum plants subjectedto cold stress. We observed that Sly-miR166 and SlymiR319were up-regulated by cold treatments. The upregulationof Sly-miR166 and Sly-miR319 in cold stresstreatedS. lycopersicum seedlings and the down-regulationof their respective targets, HD-Zip III and GAMyb-like thatvalidate by 50-RACE technique, suggests that these miRNAsplay a critical role in regulating S. lycopersicumresponses to cold stress.
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Maryam Meshksar,Fatemeh Salahi,Fatemeh Zarei-Jelyani,Mohammad Reza Rahimpour,Mohammad Farsi 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
This research focuses on controlling the morphology and crystalline phase of hollow Al2O3 spheres as asupporting material of Ni-based catalysts for the first time, which is then applied as a catalyst of hightemperaturesteam methane reforming (SMR) process. For this purpose, the effects of hydrothermal time,the concentration of alumina salt, and calcination temperature on the structure of support are investigatedand adjusted and then loaded with 15–25 wt.% Ni contents. The morphology of synthesized hollowalumina samples and 20Ni/H-Al2O3 catalyst before and after reaction are characterized using XRD,FESEM, TEM, H2-TPR, CO2-TPD, EDX, FTIR, N2 adsorption/desorption, and mapping techniques. Thehydrothermal time of 72 h, calcination temperature of 800 C, and alumina salt concentration of1.00 M resulted in the spherical morphology of hollow Al2O3 with 236.26 m2/gr surface area and highcrystallinity. Among different Ni loadings, 20Ni/H-Al2O3 had the highest CH4 conversion of 87.75% andH2 yield of 92.09% at 700 C. This catalyst also depicted stable performance during 12 h SMR reactionat 700 C with low carbon deposited contents.
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