scholarly works
Permanent URI for this collectionhttps://repository.ui.edu.ng/handle/123456789/473
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Item A biobjective production planning model and application of three LP procedures(Nigerian Metallurgical Society, 1999) Adeyeye, A. D.; Charles-Owaba, O. E.A biobjective model is proposed for production planning in a multi-stage, multi-facility production system. The decision situation considered was a case where the Decision Maker (DM) wants to determine the quantities of materials to be fed into each production facility at each stage of production that gives maximal realization of his objectives. A numerical example is solved using three Linear Programming procedures. The methods used are: Compromise Constraint Biobjective LP (CCBLP), Linear Combination of the Objective Functions (LCOF) and Goal Programming (GP). The behaviour of the CCBLP model shows that it is superior to LCOF and non-preemptive GP in terms of its sensitivity to relaxations in the objectives. It also supports the result of an earlier research that the CCBLP gives the real compromise solution.Item Effect of some variables on the carburization of a locally produced steel(Nigerian Metallurgical Society, 1987) Adepoju, O. T; Balogun, S. A.; Adeyeye, A. D.The effects of carburizing time, temperature and percentage energizer on the case-depth and hardness of a steel ST37-2 have been studied. For carburizing medium consisting of hardwood charcoal and coke and various amount of sodium carbonate as energizer, increasing carburizing time and temperature increased both the depth and hardness of the case. Increasing both the amount of energizer and carburizing time lowered the activation energy for the carburization process. The average hardness of the carburized layer decreased with tempering. Two processes are found to be operative during carburizing; one which is strongly activation energy dependent and the other which is mildly dependent on activation energy.