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- 저자 : Kiyani, Hamzeh (검색결과 5 건)
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Calculation of gamma buildup factors for point sources
Kiyani, Abouzar,Karami, Abbas Ali,Bahiraee, Marziye,Moghadamian, Hossein Techno-Press 2013 Advances in materials research Vol.2 No.2
Objective of this study is to calculate gamma buildup factors for pointed and isotropic gamma sources in depleted uranium, uranium dioxide, natural uranium, tin, water and concrete using MCNP4C code. The thickness of the media ranges from 0.5 to 10 mean-free-path (mfp) and gamma energy ranges from 0.5 to 10 MeV. Owing to the outstanding accuracy of MCNP in calculation involving gamma interaction, results fairly match those reported previously. The maximum relative error is 2%.
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Pilote Kiyani,Jewel Andoh,이요한,이돈구 한국산림과학회 2017 Forest Science And Technology Vol.13 No.4
Rwanda’s natural forest is under pressure due to increasing rural population growth and subsistence farming. The Rwanda Ministry of Agriculture has therefore introduced agroforestry technology in forest-dependent communities to minimize the pressures on the forests and improve local people’s livelihoods. This new technology has, however, not seen massive adoption in the country. This study examined the socioeconomic and environmental benefits of the agroforestry technology introduced particularly in Nyamagabe District and the challenges facing its adoption. Results showed that the agroforestry practices are contributing to an increase in income of agroforestry adopters compared to non-agroforestry adopters, and are improving soil fertility, reducing deforestation, and conserving soil and water in the district. However, results showed that, due to lack of skills and technical know-how, capital and quality seeds, some farmers are declining to adopt the new agroforestry practices. The respondents perceived that by providing subsidies to farmers, regular training, and informal education, establishing tree nurseries to improve the production of quality seeds, and also involving farmers in decision-making will increase agroforestry adoption. The government and other stakeholders should consider the views expressed by the farmers and take the necessary steps to address these challenges facing agroforestry technology adoption.
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Hamid Rahman,Shams-Ul-Islam,Zhou Chao Ying,Tanvir Kiyani,Suvash C. Saha 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.1
Flow patterns and aerodynamic characteristics behind three side-by-side square cylinders has been found depending upon theunequal gap spacing (g1= s1/d and g2= s2/d) between the three cylinders and the Reynolds number (Re) using the Lattice Boltzmannmethod. The effect of Reynolds numbers on the flow behind three cylinders are numerically studied for 75 ≤ Re ≤ 175 and chosenunequal gap spacings such as (g1, g2) = (1.5, 1), (3, 4) and (7, 6). We also investigate the effect of g2 while keeping g1 fixed forRe = 150. It is found that a Reynolds number have a strong effect on the flow at small unequal gap spacing (g1, g2) = (1.5, 1.0). It isalso found that the secondary cylinder interaction frequency significantly contributes for unequal gap spacing for all chosen Reynoldsnumbers. It is observed that at intermediate unequal gap spacing (g1, g2) = (3, 4) the primary vortex shedding frequency plays a majorrole and the effect of secondary cylinder interaction frequencies almost disappear. Some vortices merge near the exit and as a resultsmall modulation found in drag and lift coefficients. This means that with the increase in the Reynolds numbers and unequal gapspacing shows weakens wakes interaction between the cylinders. At large unequal gap spacing (g1, g2) = (7, 6) the flow is fullyperiodic and no small modulation found in drag and lift coefficients signals. It is found that the jet flows for unequal gap spacingstrongly influenced the wake interaction by varying the Reynolds number. These unequal gap spacing separate wake patterns fordifferent Reynolds numbers: flip-flopping, in-phase and anti-phase modulation synchronized, in-phase and anti-phase synchronized. It is also observed that in case of equal gap spacing between the cylinders the effect of gap spacing is stronger than the Reynoldsnumber. On the other hand, in case of unequal gap spacing between the cylinders the wake patterns strongly depends on both unequalgap spacing and Reynolds number. The vorticity contour visualization, time history analysis of drag and lift coefficients, powerspectrum analysis of lift coefficient and force statistics are systematically discussed for all chosen unequal gap spacings and Reynoldsnumbers to fully understand this valuable and practical problem.
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