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Mohammad M. Yamin,Ahmed M. Ashteyat,Izzaldin Al-Mohd,Enad Mahmoud 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.4
The effects of foundation rigidity and applied stress on the distributions of contact stresses beneath circular foundations resting on sandy soil were investigated in this paper. Three foundation cases were considered in this study; one case considered rigid foundations behavior with Kr value of 1 (Kr is the relative soil/foundation stiffness index) and two cases considered non-rigid foundations behavior with Kr values of 0.05 and 0.005. The built-in material models of the Finite Element (FE) program ABAQUS were used to capture the stresses at the contact surfaces between the soil and the foundation at different applied loading levels (from 5%-100% of the ultimate bearing capacity of the foundation) for the three foundation cases. The FE analysis results indicated that the contact stresses (qc) are strongly dependent on the relative soil/foundation stiffness index (Kr) and the ratio (q*) of the applied stress on the foundation (q) relative to the ultimate bearing capacity of the foundation (qu). For a rigid foundation, the contact stress distribution was found to have either a parabolic shape at the ultimate (q* = 1) with peak contact stress of 1.4q or a saddle shape for q* < 1 with peak contact stress that ranges from 1.3-1.5 q. For a non-rigid foundation, contact stresses distribution has a saddle shape at all q* values with a non-zero stresses at the edges and peak stress that ranges from 1.1-1.38 q. The numerical simulations results were then interpreted and presented in form of dimensionless charts, which in turn, will enable the estimation of the contact stress at any point within the contact area between the foundation and the soil.
RELATIVE RELATION MODULES OF FINITE ELEMENTARY ABELIAN p-GROUPS
Yamin, Mohammad,Sharma, Poonam Kumar Korean Mathematical Society 2014 대한수학회보 Vol.51 No.4
Let E be a free product of a finite number of cyclic groups, and S a normal subgroup of E such that $$E/S{\sim_=}G$$ is finite. For a prime p, $\hat{S}=S/S^{\prime}S^p$ may be regarded as an $F_pG$-module via conjugation in E. The aim of this article is to prove that $\hat{S}$ is decomposable into two indecomposable modules for finite elementary abelian p-groups G.
RELATIVE RELATION MODULES OF FINITE ELEMENTARY ABELIAN p-GROUPS
Mohammad Yamin,Poonam Kumar Sharma 대한수학회 2014 대한수학회보 Vol.51 No.4
Let E be a free product of a finite number of cyclic groups, and S a normal subgroup of E such that E/S = G is finite. For a prime p, ˆ S = S/S ′ Sp may be regarded as an FpG-module via conjugation in E. The aim of this article is to prove that ˆ S is decomposable into two indecomposable modules for finite elementary abelian p-groups G.
Ahmad M. Abu-Jrai,Ala’a H. Al-Muhtaseb,Jehad A. Yamin,Khalid A. Ibrahim,Omar A. Al-Khashman,Mouath A. Al-Shaweesh,Muhannad A. Hararah,Umer Rashid,Mohammad Ahmad,Gavin M. Walker 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The performance of a highly cross-linked polyethylene catalyst supported on alumina for low temperature selective catalytic reduction of NOx by unburned hydrocarbons (HCs) existing in an exhaust gas was examined at different engine conditions with the addition of exhaust-gas recirculation. The HXPE catalyst was shown to exhibit good NOx reduction activity at low temperatures (100–250℃) where the only reductant was the unburned HC, which was already present in the exhaust flow. The maximum NOx reduction of approximately 52% was achieved at a temperature of 150℃. HXPE demonstrated very good selectivity toward N2 in the majority of tested conditions ( 80%).