Browsing by Author "Oke, Adekola Olayinka"
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Item The Effect of Beneficiation on Some Properties of Osun State Ceramic Raw Materials(Journal of Casting & Materials Engineering, 2019) Abiola, O. A.; Oke, Adekola Olayinka; Omidiji, Babatunde Victor; Adetan, Dare AderibigbeClay, feldspar and silica sand are important industrial minerals which often need treatment commonly known as beneficiation to improve the quality of ceramic tiles produced from these materials. The different minerals, after sorting, were treated separately in distilled water, alcohol and hydrochloric acid before being crushed in a ball mill; they were then characterized using a pelletron accelerator. The results show an increased silicon content for clay, silica sand and feldspar; and reduced aluminum content for clay and silica sand but not for feldspar. Iron impurity and its oxide are also shown to reduce by over 50% in all the minerals while potassium was found to be the dominant element in feldspar among the defining elements. In conclusion, the increased quartz in the mineral will improve the hardness, density, porosity, and rigidity of ceramic tiles as well as providing support and controlling shrinkage. Furthermore, increasing the mineral quotient in feldspar will enhance its fluxing potential.Item Safe work-impulse chart for roadside auto-mechanics(International Journal of Safety and Industrial Ergonomics, 2016) Abiola, Oluranti Adetunji; Oke, Adekola Olayinka; Koya, Olufemi AdebolaThe work evaluates the response of the heart rate of non-mechanics handling some specific loads in the common postures employed during road-side repair of automobile and later, the result was validated with the auto-mechanics during repair activities. The purpose is to specify the safe work-impulse of auto-mechanics in the common postures, such as, bending, stooping and supine posture, used during roadside repair. The safe work-impulse was determined for preselected healthy non-mechanics of the classified age groups who gave informed consent. Increase in heart rates at exhaustion of non-mechanics in each age group, in lifting predetermined loads were measured using digital premium pressure monitor with a comfit cuff. Consequently, the work-impulse charts for the load classifications and different age-groups were developed for the different postures. The heart rates of the auto-mechanics performing specific tasks during engine repairs were then measured to determine the equivalent work-impulse, using the developed charts. The result revealed that, auto-mechanics handling the same mass of load under the same conditions have lower safe work-impulse. In conclusion, the study reveals that roadside auto-mechanics have the capacity to sustain higher safe work-impulse in bending and supine postures than in stooping posture.