This study used hair and nails to biomonitor heavy metals (Pb, Cd, Cr and Cu) from geological source and exposure through regular fish consumption among children in Lake Victoria, Kenya. Concentration of Pb and Cu in water reflected anthropogenic pathways, while Cd and Cr reflected accumulation from the catchment basin. Higher concentration of heavy metals in the nails samples than the hair sam...

Hypervelocity impact studies are important for debris shield and a.rmor/anti-armor research and development. Numerical simulations are frequently performed to complement experimental studies, and to evaluate code accuracy. Parametric computational studies involving material properties, geometry and impact velocity can be used to understand hypervelocity impact processes. These impact simulation...

The existing heat dissipation research on double disk magnetic couplers ignores the coupling influence of electromagnetic temperature–stress and other multiphysics fields, error between calculation analysis results measured values is large. Therefore, a multi-parameter optimization method for structures based orthogonal experimental design proposed. Based coupler model, three-dimensional finite...

Abstract In this paper, copper azide of 2mm in diameter was exerted as the burster, and study object micro initiation train Cl20-based explosive that generated by flyer plate impacting medium accelerating chamber. Results shows that: thickness critical burst increased with plate.Simulation calculation experimental verification were conducted to parameter influence chamber on medium. which could...

In this paper, the modeling of solidification Al-4Cu alloy was studied. The calculation code is developed to model equiaxed globular in a square mold. mold walls are subjected constant temperatures and velocity components equal 0, exchange coefficient ’H’ between interface melt estimated at 500 W/( m 2 K) initial temperature ’T0’ 900 K. resolution method used finite differences, upwind scheme f...