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Articles by G.J. Adeyemi
Total Records ( 2 ) for G.J. Adeyemi
  A.J. Alawode , J.T. Stephen and G.J. Adeyemi
  Environmental pollution is a major adverse consequence of the rapid urban growth, increased economic activities and industrial development witnessed globally and particularly in Nigeria for the past few years. Various forms of pollution pose threat to the health and safety of mankind and its environment. This study, therefore, carries out an assessment of the health, safety and environmental issues in Nigerian manufacturing and processing industries with a view to re-awakening and re-sensitizing environmentally conscious industrial activities and municipal waste disposal attitudes towards a safe and healthy environment. Diverse forms of occupational hazards, air and water pollution and waste management and disposal challenges are discussed and the health, safety and environmental attitudes of Nigerian industries, municipalities and the public in general are reviewed. Workers in many Nigerian companies are exposed to a lot of occupational hazards and our air and water pollution control and waste management and disposal systems need to be improved to comply with international standards. Suggestions are therefore made towards an improved health and safety status of the environment by recommending industrial health, safety and environmental policies for Nigerian companies. Measures of minimizing occupational hazards and ways of actualizing efficient and effective industrial waste management and disposal systems are also recommended.
  G.J. Adeyemi and S.B Adeyemo
  The effects of sand mould preheat temperature of range 30-200C and shakeout times of range 5-25 min on the tensile, impact and hardness properties of cast aluminium alloy were experimentally investigated and presented. Increase in mould preheat temperature and shakeout time were found to increase the impact energy and percentage elongation at fracture but decrease the hardness and ultimate tensile strength of the specimens. Preheating as-prepared mould of 5 min shakeout time to 200C caused the impact energy and percentage elongation at fracture of the specimen to increase from 40.23 Nm and 0.48% to 43.55 Nm and 0.81%, respectively; while hardness and ultimate tensile strength decreased from 64.60 HB and 140.02 MP to 52.80 HB and 96.74 MPa, respectively. However, increasing the shake-out times of as-prepared mould from 5-25 min caused the impact energy and percentage elongation at fracture to increase from 39.23 Nm and 0.48% to 44.65 HB and 1.29%, respectively; while hardness and ultimate tensile strength decreased from 64.6 HB and 140.02 MN m 2 to 50.8 HB and 78.92 MN m 2. These variations show that the mechanical properties of cast aluminium alloy can be controlled to suit particular application by varying the sand mould preheat temperature and shakeout time.
 
 
 
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