scholarly works

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    The development and evaluation of a flat-type wooden incubator
    (School of Agriculture and Agricultural Technology (SAAT), Federal University of Technology, Akure, 1998) Ewemoje, T. A.; Olorunnisola, A. O.
    "A flat-type, 60-egg capacity incubator was designed, constructed and tested. The incubator differs from existing designs in that the cabinet was made from a 3-ply, 4mm thick interior grade plywood to reduce cost and at the same time enhance heat insulation. Also, two domestic kerosene lanterns were provided to supplement heat generation by three 40 W electric bulbs during electricity outages as commonly experienced in Nigeria.When tested with 30 eggs of a commonly sold chicken breed, incubated at average temperature of 38° C and relatively humidity of 58%, the chicks were hatched within 20 days. Relatively high percentages of fertility and hatchability of 86.2% and 76% respectively, as well as a relatively low chick mortality rate of 18.5% were recorded. "
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    Effects of selected pre-treatment on the setting of cement composite from two rattan species
    (2009) Adefisan, O. O.; Olorunnisola, A. O.
    "The effects of aqueous extraction and removal of silified epidermis from rattan canes on the maximum hydration temperature (Tmax) and setting time (tmax) of two rattan canes species, Calamus deerratus and Lacosperma secundiflorum, mixed with portland cement were investigated. Tmax ranged from 37.0 to 58.66oC for the C.deerratus and L.secundiflorum composites respectively while tmax was from 3.7 to 26.5hrs and 7.4-25.7 hrs. Aqueous extraction increased the Tmax and reduced the tmax of the rattan-cement mixes while removal of epidermis generally caused reduction in both Tmax and tmax. The two rattan species seemed more amenable to cold than hot water extraction. Although cement extraction improved the tmax of the Calamus-cement composite more than Lacosperma cement composite. Epidermis removal, species, aquenous pre-treatment and their interactions had significant effect on the setting time than of the rattan-cement mixes. "
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    Compability of calamus Deerratus and lactosperma secundiflorum rattan particles with ordinary portland cement
    (2007) Adefisan, O. O.; Olorunnisola, A. O.
    An investigation was conducted to determine the optimum water to cement ratio for a locally manufactured portland cement for use in wood composites. The effects of pre-processing and calcium chloride (CaCl2) on the compatibility of two rattan canes ( Calamus deerratus and Lacosperma secundiflorum) with cement were also assessed using the compatibility factor (CA) approach. An optimum water: cement ratio of 0.45 was obtained. Generally the two rattan species were compatible with cement. The CA factors increased with increasing levels of CaCl2 concentration (65.2% to 101.5% for C.deerratus and 71.2% to 103.5% for L. secundiflorum at 0 to 3% concentrations). Removal of the silified epidermis (pre-processing) had more significant effect (p< 0.05) on the compatibility of C. deerratus with cement than in the L. secundiflorum species. Also, the particles of the Lacosperma species were more compatible with cement than those of the Calamus species probably due to the anatomy and other variations in the two species.
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    Trial Production and Testing of cement-bonded particles board from rattan furniture waste
    (Society of Wood Science and Technology, 2002) Olorunnisola, A. O.; Adefisan, O. O.
    An investigation was conducted on the use of rattan (cane) furniture waste as furnish material for the manufacture of cement-bonded particleboard (CBP). Laboratory scale CBPs were fabricated from hot water pretreated chopped strands of mixed rattan waste obtained from rattan furniture workers in Ibadan, Oyo State, Nigeria. Three-layered boards of 6-mm thickness were made comprising coarse core and tine surfaces at two density levels of 1,050 kg/mi and 1,200 kg/m3, three CaCl2 concentration levels of: 2.5%, 3.0% and 3.5% and using Portland cement-cane mixing ratios of 2.5:l .0, 2.75: 1 .0, 3.0: 1 .0, and 3.25: 1 .0. After board manufacture, ASTM D 1037 (1998) test procedures were employed to obtain strength and moisture absorption properties. Average properties for bending modulus of rupture (MOR) and modulus of elasticity (MOE) of the boards ranged between 0.5 and 1.6 N/mm2, and 480 and 3,563 N/mrn2, respectively. Mean thickness swelling (TS) and water absorption (WA) values ranged between 1.1 and 8.6%, and 31 and 51%, respectively. Analysis of variance showed that except for MOE, the levels at which the density, CaCI2 concentration, and cement-cane mixing ratio were used and their interaction had no significant effects on properties of the board. The relatively low strength and water resistance properties of the boards make them suitable only for use in low stressed interior applications. Further investigations are, however, required on the effects of different cane preparation procedures and other fabrication variables on board properties. This is necessary to provide the guidelines required to adequately control the fabrication process and optimize material properties.
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    Effects of cane peeling and aqueous extraction on compatibility of two rattan species with portland cement
    (2008) Olorunnisola, A. O.; Adefisan, O. O.
    Rattan cane is a relatively abundant lignocellulosic in Africa and Asia that could be used for wood-cement composite production. However, rattans tend to inhibit cement setting. This study investigated the effects of cane peeling and aqueous extraction on maximum hydration temperature (Tmax) and setting time (tmax) rattan-cement- water systems using Calamus deerratus and Lacosperma secundiflorum rattan species. Peeling was done manually to remove the silified epidermis before hammer-milling to obtain cane particles. Portions of the particles were soaked in de-ionised cold (25oC) and hot water (800C) respectively for 30 minutes. Findings showed that aqueous extraction improved the Tmax and reduced the tmax of the rattan-cement mixtures while peeling caused reduction in both Tmax and tmax. The two rattan species seemed more amenable to cold rather than hot water extraction. Peeling, species, aqueous pre-treatment and their interactions had significant effects on the setting time of the rattan-cement mixtures.