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Item Influence of fiber characteristics of Nigérian grown Bambusa vulgaris Schrad on its relative density and burst strength(Department of Agricultural and Environmental Engineering. University oflbadan, Nigeria, 2008) ogedengbe K.Strength properties of Bambusa vulgaris with increasing culm height was studied considering its fiber characteristics with particular reference to the presence or absence of nodes. At the interaode. an increase in fiber length with increasing culm height (2.78 mm-3.73 mm from base to lop) was observed, while fiber diameter behaved conversely, showing a reduction from base to top (0.033 mm-0.013 mm). Relative density and burst strength had a similar trend as they both showed reduction in values from base to top (0.62-0.31 and 8.2KN/mmJ - 5.3KN/mnr respectively). At the node, reduction in fiber length from base to top (1.79 mm 1.39 mm) was ohserved. while fiber diameter increased from base to top (0.023 mm-0.031mm). Relative density showed a reduction from base to lop (0.64-0.32). while burst strength had a similar trend having a range of above 1 IKN/mm5-5.4KN/mmJ from base to top Statistical analysis of the data from the node revealed a strong direct correlation between fiber length and relative density, while fiber diameter showed a weak and inverse relationship. Burst strength showed a direct but weak relationship with fiber length, while it had an inverse and weak correlation with fiber diameter. At the intemode. a weak and inverse relationship was revealed between density and fiber length, while fiber diameter showed a direct but weak relationship. Burst strength and fiber length showed a strong but inverse correlation, while fiher diameter and burst strength revealed a direct and significant correlation.Item Trends in fiber characteristics of Nigerian grown bamboo and its effect on its impact and tensile strengths(Department of Agricultural and Environmental Engineering, University of Ibadan, Nigeria, 2008) Omobowale M.O.Variations in impact bending and tensile strengths of Bambusa vulgaris (Schrad) with increasing culm height were studied considering its fiber characteristics at the nodes and internodes along the length of the culm. At the nodes, statistical analysis revealed a weak but direct correlation between fiber length and tensile strength while fiber diameter had a strong but inverse relationship with it. Impact bending showed a direct but weak relationship with fiber length while it had an inverse and weak correlation with fiber diameter. For the internodes, a st-'^gn inverse relationship was established between fiber length and tensile strength while fiber diameter showed a direct but weak relationship. Impact bending and fiber length had a strong but inverse correlation while fiber length and impact bending revealed a direct and significant correlation.Item Primary wood conversion and processing in nigeria : a status report.(1999) Olorunnisola A.O; Omoniyi T.EItem Icast 2007 Advancement through technology & education(INTERNATIONAL CONFERENCE, 2007) Mijinyawa .YThe moduli of elasticity and rupture, and the energy to cause failure under impact load of oil palm truck were determined. Samples for testing were obtained from the base, middle and top of the tree truck. They were taken from both the core and outer region of the truck and tested wet and dry conditions. the samples obtained from the outer layer of the base and tested under wet and dry conditions, gave the highest modulus of elasticity of 4943 N/mm and a modulus of ruture of 42.8 N/mm. The samples obtained from the inner section of the top and tested under wet condition gave the lowest values of 369.7 N/mm for modulusof elasticity and 0.4 N/mm for modulus of rupture. The maximum value of energy consumption of 12.86 joules was recorded for the samples from the inner portion of the top and tested under dry condition. There was a general decrease from the base to the top for the three parameters and from inside to the outer section.Item Utilization of oil palm wastes in south western Nigeria(The Nigeiran Society of Engineers, 2003) Mijinyawa, Y.; Ogunbanjo, O. I.A survey involving the use of questionnaires and personal communication during field visits was undertaken in Ekiti, Ogun, Ondo, Osun and Oyo states of Nigeria to ascertain the level of utilization of the inedible portions of oil palm products often referred to as wastes. Items identified as wastes and their present uses include trunk for bridges and roof trusses; fronds and leaves for brooms, thatching of roofs and fences, staking of creeping and climbing plants, weavmg of baskets and cages and cordage materials; fruit bunches for black soap production; kernel shells for soil erosion control and furnace fuel; and mill effluents for sludge cake used as fuel, A substantial amount of these wastes are unutilized which has resulted in their constituting nuisance in plantations and mill sites. Incineration is the only disposal method employed to create space for other activities. It is recommended that the use of these wastes be popularized among urban dwellers to create market for them. Fruit harvesting and conversion of the trunk are tedious; hence the development of appropriate technology for improved efficiency required.Item The influence of post-cracked exposure period on some physical properties of palm kernel shells(The Nigeiran Society of Engineers, 2000) Mijinyawa, Y.; Falayi, F. R.A series of experiments were conducted to measure the influence of the duration of exposure to inclement weather after cracking on the bulk density, solid or true density, porosity, and water absorption characteristics of palm kernel shells (PKS). The results showed that the bulk and true densities decreased respectively from 0.60g/cm3 and 1.37g/cm3 for freshly cracked shells to 0.53g/cm3 and 1.25g/cm3 for shells that have been exposed to inclement weather for over ten years after cracking. The porosity and ability to hold moisture increased with the duration of exposure. These experimental observations are attributable to the organic nature of the shells as a result of which there is a gradual biodeterioration especially of the adhering fibers. This reduces the dry matter content and increase the void. Density values obtained are comparable with other materials of construction such as earth and wood which is an indication that PKS has potentials for use as a material for construction. Further work on the mechanical properties of the material is recommended.Item Coefficient of static friction of palm kernel shell on selected structural surfaces(The Nigeiran Society of Engineers, 2000) Mijinyawa, Y.; Falayi, F. R.An experiment was conducted to measure the static coefficient of friction of palm kernel shell (PKS) on plywood, galvanized iron and glass. The results of the test showed that the coefficient of static friction of PKS increases with moisture content irrespective of the surface employed. The .values of coefficient of static friction obtained varied from 0.42 to 0.75 on plywood, 0.34 to 0.62 on galvanized iron and 0.32 to 0.56 on glass for moisture contents ranging from bone dry to 18.4% wet basis. This implies that PKS is most resistant to flow on plywood and least on glass. A statistical analysis showed that these variations with structural surfaces were Significant. Further similar work using the cracked palm kernel is recommended.Item Farm structures and rural electrification palm kernel shells as coarse aggregates for light weight concrete(The Nigeiran Society of Engineers, 1999) Mijinyawa, Y.; Okedoku, O. W.The escalating cost of conventional building material has given rise to the need to source for alternative ones. In souring for such alternatives, the durability, availability and cost of the potential material should be considered. Palm kernel shell (PKS), a by-product in the process of palm kernel oil extraction found in abundance in southern and grossly underutilized was considered of potential as a coarse aggregate for light weight concrete. In order to confirm the assumed potential, it was considered necessary to determine the density and compressive strength of concrete cubes manufactured from PKS. Coarse aggregates made us of crushed granite and PKS mixed in varied proportions were used to cast 150mm x 150 mm concrete cubes of 1: 3: 6 mix batch by weight. The cubes were removed from moulds 24hr after casting and immersed in water for seven days to cure. The density and compressive strength of the cubes were then decreased. Expectedly, the density and crushing strength of cubes decreased with increase in the amount of PKS in the cubes but the density range of 1520 to 2234kg/m3 and strength values of 0.44 to 3. 89N/mm2 obtained were good enough for light weight concrete. PKS has great potential as a material for coarse aggregate in concrete work; the use of which could considerably reduce the construction cost of building and promote environmental sanitation.Item Determination of some physical properties of palm kernel(The Nigeiran Society of Engineers, 2005) Mijinyawa, Y.; Omoikhoje, S.Experiments were carried out to determine the dimensions of palm kernel, the shell thickness, kernel and nut densities as useful parameters in its handling and processing. The major, intermediate and minor diameters of the kernel were found to vary from 26.5 to 44, 21.5 to 34.5 and 16.5 to 28mm respectively. Sphericity was calculated to be between 76 and 80 and was independent of the size of the kernel. Nut densities varied from 0.8 to 2g/cm3 while kernel densities varied from 0.93 to 1.33g/cm3. The nut densities were generally higher than the kernel densities and the variation is attributed to the large volume but lightweight of the shell. The shell thickness varied from 2 to 6.5mm. These parameters are useful in the design of handling and processing equipment for palm kernelItem Farm structures: roles and challenges in meeting the needs of the Nigerian farmer(The Nigeiran Society of Engineers, 2006) Mijinyawa, Y.Although oil is the major source of Nigeria's revenue at present, agriculture is the single largest contributor to the well-being of the rural poor. Agriculture sustains 90% of the rural labour force, provides 60% of industrial raw materials, and contributes 30% to the GDP, with 90% of the output coming from the smallholder farmers. The Nigerian smallholder farmers face a lot of challenges. They are constrained from expanding their farm sizes due to limited labour supply. Poor farm transportation and severe post-harvest losses reduce their economic fortune while the productivity of the farmer and his livestock are reduced by inadequate housing. Farm structures' intervention in the provision of good access roads for farm machinery movement would enable farmers to expand their farm holdings, appropriate crop storage structures which reduce post harvest losses, and cheap but comfortable housing will provide an enabling environment for increased productivity and income. The present Farm Structures curriculum as taught in many institutions needs to be beefed up while farm structures workshops and laboratories should be provided and well equipped. The establishment of a farm structures network is suggested.