http://196.220.128.81:8080/xmlui/handle/123456789/192 Sun, 26 Apr 2026 23:57:11 GMT 2026-04-26T23:57:11Z http://196.220.128.81:8080/xmlui/handle/123456789/5861 DEVELOPMENT OF A THERMAL CONDUCTIVITY MEASURlNG APPARATUS FOR NON-METALLIC SOLIDS AYODEJI, ANJORIN S. A thermal conductivity measuring apparatus for non-metallic solids (poor conductors) based on modified Lee's disc method has been designed, constructed and tested. Specimens of concrete, glass, portland cement, asbestosand corrugated cardboard were prepared in the form of discs each of diameter 50mm but of varying thicknesses. The average thermal conductivity values obtained for these specimens over a heat source temperature range of 25°C- 60°C were found to be 1.285, 0.737, 0.327, 0.121 and 0.072 Wm-1 K-1 respectively. The values of thermal conductivity obtained for the various specimens were compared with those given in the literature for the purpose of determining the effectiveness of the apparatus. The differences in values ranged between 1.55- 11.03 per cent thus giving credence to the effectiveness of the apparatus. 76p.:ill.;30cm Mon, 01 Jan 1996 00:00:00 GMT http://196.220.128.81:8080/xmlui/handle/123456789/5861 1996-01-01T00:00:00Z http://196.220.128.81:8080/xmlui/handle/123456789/5860 DEVELOPMENT OF A ROTARY FURNACE FOR COTTAGE FOUNDRIES AKINSIPE, TAIWO ELIZABETH A 20 kg Rotary Furnace was designed and fabricated for application at the cottage industry level. The capacity which is considerably smaller than the industrial type (100 kg and above) facilitated economic application by the small-scale inventor. The components of the furnace such as the lining and the metallic bought out parts were locally developed and the performance compared very well the imported materials. Although higher capacity imported furnace with imported lining gave higher performance of higher refractoriness and life span. The present prototype still gave satisfactory performance and provides a ready source of relining. 75p.:ill.;30cm Wed, 01 Dec 2004 00:00:00 GMT http://196.220.128.81:8080/xmlui/handle/123456789/5860 2004-12-01T00:00:00Z http://196.220.128.81:8080/xmlui/handle/123456789/5859 DEVELOPMENT OF A QUEUEING MODEL FOR EFFECTIVE CREW SIZE IN MAINTENANCE OPERATIONS BULIAMINU, KAREEM This thesis describes the use of heuristics and cost models based on the queueing theory to determine effective crew size for maintenance operations. The model was applied to mechanical maintenance workshop, Federal University of Technology, Akure, due to the fact that it has characteristics of external maintenance system. A computer software in "QBASIC" was developed to solve the model. The results obtained from this approach showed that, the use of heuristics generated effective crew size of one (a seven-man crew), while that of maintenance cost model was two, given a difference of 50%. Also, by using deterministic cost model 1.5 secs. was used to process the results, while the time used to process the results in stochastic cost model depends on maximum simulation time MCT, but for heuristic it was just 0.5 second. The results revealed the advantage of using heuristic over complex equations of maintenance cost models. Therefore, to achieve higher response rate, the jobshop should operate on two crews. Although, management can decide to operate on one crew (as prescribed by heuristic) if other maintenance strategic decisions are in her favour than any other jobshops in the environment. Finally, the results generated by both deterministic and stochastic cost models showed that both are equally likely to describe the maintenance jobshop under study 128p.:ill.;30cm Tue, 01 Sep 1998 00:00:00 GMT http://196.220.128.81:8080/xmlui/handle/123456789/5859 1998-09-01T00:00:00Z http://196.220.128.81:8080/xmlui/handle/123456789/5725 DEVELOPMENT OF A ROTARY FURNACE FOR COTTAGE FOUNDRIES AKINSIPE, TAIWO ELIZABETH ABSTRACT A 20 kg Rotary Furnace was designed and fabricated for application at the cottage industry level. The capacity which is considerably smaller than the industrial type (100 kg and above) facilitated economic application by the small-scale inventor. The components of the furnace such as the lining and the metallic bought out parts were locally developed and the performance compared very well the imported materials . Although higher capacity imported furnace with imported lining gave higher performance of higher refractoriness and life span. The present prototype still gave satisfactory performance and provides a ready source of relining. 75p.:ill.;30cm. Wed, 01 Dec 2004 00:00:00 GMT http://196.220.128.81:8080/xmlui/handle/123456789/5725 2004-12-01T00:00:00Z