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Atomic Absorption Spectrometer(AAS) was used to determine the chemical composition, while other established processes were used to determine other insulating properties like particle size distribution, specific gravity, bulk density, solid density, water absorption, apparent porosity, permeability to air, refractoriness, thermal shock resistance, modulus of rupture, linear shrinkage and thermal conductivity. The chemical analysis showed that all the samples had high percentages of silica and alumina, thereby classifying them as Alumino-silicates. In order to project a better representation of the territory, the samples were mined from ten cites each.
Several topics are categorized provides useful guidelines regarding background and operating principles of ejector including mathematical modelling, numerical simulation of ejector system, geometric optimizations. Ejectors: Applications in Refrigeration Technology. Renewable and Sustainable Energy Reviews 2004; 9–55. The results showed that the linear shrinkage improved from an average of 8.57% for the three samples for 0% sawdust to an average of 8.32% with 40% addition of saw dust, bringing them closer to the lower range of the international standard of 7-10%. In the other approach PID controller is employed for the plant model (microstructure development). "Application of control theory principles to optimization of grain size during hot extrusion," Materials Science and Technology, Vol 14, pp.25-31, Jan 1998. Ltd, New Delh Abstract: l Capital of Abuja like linear shrinkage, solid density, apparent porosity and thermal conductivity were characterized with a view of studying the effect of sawdust on them. The state-space model together with an optimality criterion is used to control the percentage of volume fraction recrystallization using Linear Quadratic Regulator method. P (1988) Rheological properties of certain Nigerian clay. Obi V S (1995) Experimental analysis of clay for refractory purpose , B.
Apparent porosity averaged 13% with 0% saw dust and 17% with 40% addition of saw dust bringing them closer to the acceptable range of 20-80%. When comparing the responses, the PID controller provides better performance compared with LQR.