Obtaining the green's function for electromagnetic waves propagating in layered in-homogeneous thin film media of spherical particles on a substrate

The Green's function technique has been used to evaluate the contact stresses acting between layered non-homogeneous media as waves propagated along the surface of the half-spherical space. Integral equation using Green's function as a kernel was employed and three-dimensional function for the homogeneous model was examined by potential method. One of the additional phenomena speculated was the possibility of the stonely surface waves propagating along the contact surface of the layer along with electromagnetic waves. The conditions that obeyed radiation for half spaces were considered in the solution and discussed Keywords: Green's function, electromagnetic waves, thin film media, radiation Nigerian Journal of Physics Vol. 17, 2005: 11-1

Development of model equations for the estimation of corrosion susceptibility of Al-ZN duplex alloy systems in Brine

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Mechanical Properties of 0.14wt%C – 0.56wt%Mn – 0.13wt%Si Structural Steel

Effect of intercritical heat treatment on 0.14wt%C – 0.56wt%Mn – 0.13wt%Si structural steel has been investigated. Specimens for single quenching and those for double quenching were prepared for intercritical heat treatment.  The heat treatment of the experimental steel was based on intercritical annealing in the ferrite + austenite temperature range of the Fe – C phase diagram at temperatures745oC, 755oC, 765oC, 775oC, 785oC, 795oC and 805oC for 1 hour at each temperature  in a laboratory  muffle heat treatment furnace followed by quenching in plain water to room temperature. Specimens for single quenching were subjected to the above heat treatment route once while those for double quenching were subjected to the heat treatment route twice. Afterwards the specimens that were subjected to single quenching and those that were subjected to double quenching were separately tempered in a laboratory muffle heat treatment furnace at a temperature of 200oC for 1hour and cooled to room temperature in still air. The results revealed that single quenching eliminated the yield strength, increased the tensile strength and hardness properties but decreased the ductility and notch impact toughness properties of the experimental steel. Moreover, the results also revealed that double quenching eliminated the yield strength, and produced a greater increase in tensile strength and hardness properties than single quenching but a greater decrease in the ductility and notch impact toughness properties than single quenching of the experimental steel. Tempering increased the yield strength, ductility and notch impact toughness properties of the quenched steels but decreased their tensile strength and hardness properties. The established heat treatment conditions can be useful for manufacturing steels of high strength and hardness and good ductile and notch impact toughness properties