Journal Of Sustainable Environmental Management.

 Journal

 Preliminary Assessment Of Natural Resistance Of Borassus Aethiopum Mart. Wood To Termite Attack

 Falade, O.E. And Owoyemi, J.M.

 2018

The knowledge of natural resistance of wood used in an environment is necessary to guide builders in knowing precautions to be taken before construction due to the destructive activities of termites and other biodeteriorating agents. The natural durability of Borassus aethiopum wood was investigated longitudinally (i.e. top, middle and base) and transversely (inner portion and outer portion). Density results for B. aethiopum showed that the outer portion was higher than the inner portion with density mean values of 999.10 Kg/m3 and 502.78 Kg/m3 respectively. Weight loss due to termites’ attack was higher at the inner portion than the outer portion for the top, middle and the base part of the wood with mean weight loss of 9.87% and 0.75% for the inner and outer respectively revealing that the outer portion is more resistant than the inner as reflected also in the density result. The natural durability of B. aethiopum wood to termite attack was because of the arrangement of the vascular bundle tissues which were concentrated on the outer part of the bole, making it more resistant to termites than the inner part which suggests separation of the inner from the outer during conversion process to guarantee its integrity in service. Preservative treatment therefore becomes imperative for the inner portion of the wood to prolong its service life. 

 NonConventional Materials And Technologies – NOCMAT For XXI Century Materials Research Forum LLC Materials Research Proceedings 7 (2018) 341348 DOI: Http://dx.doi.org/10.21741/978194529183831

 Journal

 Effect Of Production Variables On The Properties Of Cement Bonded Flake Board From Polyalthia Longifolia (Sonn.)Thw. Wood

 Owoyemi J.M. And Oyeleye I.O

 2018

The need to source for other woody materials for particle board like spent ornamental is on the increase due to reduction in the supply of timber from natural forest. Therefore, this study was aim at evaluating the effect of flake size and mixing ratio on the physical and mechanical properties of cement bonded particleboards produced from Polyalthia longifolia wood residues, a readily available and underutilized tree species. The production variables flake sizes of 19.85 mm, 19 mm and 6.35 mm and woodcement ratios of 1:1, 2:1, and 3:1. The boards produced were subjected to physical properties tests such as water absorption, thickness swelling and linear expansion at 24, 48 and 72 hours. Water absorption, thickness swelling and linear expansion increased with decrease in flake size and mixing ratio. For the mechanical properties, the flake size of 19 mm had the highest strength as the mixing ratio increases while FS of 6.35 mm had the lowest strength. Flake size and mixing ratio had significant effects on the properties of the boards produced (P>0.5). Hence the study affirmed the suitability of spent Polyalthia longifolia flakes for Cement Bonded Board which can be used for both interior and exterior applications in building. 

 International Research Journal Of Pure & Applied Chemistry 19(1): 19, 2019; Article No. IRJPAC.49474 ISSN: 22313443, NLM ID: 101647669

 Journal

 Efficiency Of Sawdust From Selected African Indigenous Wood Spp. As A Lowcost Adsorbent For Removal Of Copper Ion From Contaminated Water

 E. A. Iyiola, J. M. Owoyemi, O. Olasunkanmi, T. P. Saliu, B. Olufemi, D.O. Dania, S.O. Ayanleye And A. Wekesa.

 2018

This study investigates the use of sawdust from 3 hardwood species as lowcost adsorbent for the removal of copper from contaminated water. The experimental design used for this study was 3 x 2 x 4 factorial experiment; the different sawdust species, two baselines (treated and untreated) and four levels of pH and time as factors were combined and used for the study. Test was carried out to investigate the effect of sawdust pretreatment on their adsorption capacity in the removal of Copper ions from contaminated water at different pH levels; the sawdust samples were sieved through a screen size of 850 ?m after which a portion of each species sawdust was subjected to pretreatment by boiling while the other portions were maintained as control samples (untreated). The results show that adsorption capacity for both treated and untreated samples were 69.75±13.78%, 68.60±19.48%, 69.34±23.08%, 74.79±17.79%, 74.52±22.30% and 76.90±18.21% for Alstonia boonei, Erythrophleum suaveolens and Ficus mucuso respectively. The contact time and pH showed no significant difference between the treated and untreated samples. Sawdust from the selected wood species are suitable to be used as adsorbent towards the removal of copper from contaminated water. 

 Applied Tropical Agriculture Volume

 Journal

 Assessment Of Density And Anatomical Properties Of Nigerian Grown Cocos Nucifera Wood

 Owoyemi, J.M. And Akinwamide, T.O.

 2018

The knowledge of density and anatomical features of wood is required to understand its morphology prior to its use in order to recommend appropriate treatments and application. Anatomy of coconut wood with its density was investigated in this study. Methods used include sectioning and fibre characterization both along and across the stem of the tree. The mean results obtained for the Fibre Length, Fibre Diameter, Lumen Width and Vessel Diameter were 1.49mm, 0.030mm, 0.02mm, and 0.27mm in that order. Its density was found to vary along the stem. The basic density distribution of Cocos nucifera showed that the middle portion has the highest density of 1107.85kg/m3, followed closely by the base portion with 1052.67 kg/m3 while the top portion recorded the least density of 1003.79 kg/m3. Both the density and anatomical results showed a comparable value which make it a suitable alternative for timber. 

 PRO LIGNO Vol. 15 N° 2 2019 Pp. 3037 ONLINE ISSN 20697430 ISSNL 18414737 Www.proligno.ro

 Journal

 A Study Of Combustion Properties Of Briquettes Produced From A Blend Of Sawdust Banana Leaves And Cow Dung In Nigeria

 Ebenezer Iyiola, Motunrayo Ogunleye, Babatola Olufemi, Jacob Owoyemi, And Samuel Ayanleye

 2018

The study was undertaken to evaluate the combustion properties of briquettes from wood and agricultural wastes. Terminalia superba sawdust and banana leaves were used and cow dung acting as binder in varying mixing ratios. The briquettes were produced using an automatic press at a constant compaction pressure of 1.77kN/m2 and the substrate were combined at ratios 5:1:4, 4:4:2, 3:2:5, and 2:5:3, the briquettes produced were subjected to combustion tests. Combustion related properties such as percentage volatile matter, percentage ash of the briquettes was determined. The compressed density ranged between 517.09 ± 35.40kg/m3 and 571.29 ± 28.73kg/m3, while the reduction in density which signifies the rate at which the briquettes reduced in density after compression and relaxation ranged between 46.82±2.56 kg/m3 and 55.81±1.80kg/m3 respectively. The result from this study shown that briquette in ratios of 2:5:3 and 3:2:5 show better combustion properties than others. 

 Biomedical Statistics And Informatics

 Journal

 Noise Pollution And Control In Mechanical Processing Wood Industries

 Owoyemi J.M., Falemara B.C. And Owoyemi J.A.

 2017

High level of noise is a disturbance to the human environment. Noise in .industries is also an occupational hazard because of its attendant effects on workers' health. Noise presents health and social problems in industrial operations, and the source is related to the machineries used in the industries. One or the unique features or the noise associated with wood machinery is the level of exposure and duration. Equipment used in a factory can be extremely loud. They can produce noise at decibels high enough to cause environmental health and safety concerns. The mechanically driven transport and handling equipment, cutting, milling, shaping and dust extractor installations in the wood industry generate noise. The sources of noise pollution have increased due to noncompliance with basic safety practices. The increased use of locally fabricated machine in the industry has increased the level of noise and vibration. The effects of industrial noise pollution as discussed include: increase in blood pressure; increased stress; fatigue; vertigo; headaches; sleep disturbance; annoyance; speech problems; dysgraphia, which means reading/learning impairment; aggression; anxiety and withdrawal. As presented in this paper, noise control techniques include; sound insulation, sound absorption, vibration damping and Vibration isolation. 

 Journal Of Agriculture, Urban And Entomology

 Journal

 Resistance Of Some Indigenous Tree Species To Termite Attack In Nigeria

 Owoyemi J.M., Adiji A.O. And Aladejana T. J.

 2017

The resistance of some indigenous types of tree species Lo attack by termites (Blattodea: Termitidae) was investigated in Ondo State, Nigeria. Indigenous trees of different bulk densities used for this study were Celtis zenheri Engl. (Cannabaceae), Albizia lebbech (L.) Benth. (Fabaccae), Terminalia superba Engl. & Diels (Combretaccae), Cola giganiia A. Chev. (Malvaccae), and Terminaila ivorensis A. Chev. (Combretaccae). The three locations used for the study were Okitipupa, Akure, and AkungbaAkoko, representing lowland rainforest, tropical rainforest, and savannah regions, respectively. The primary termite species recovered were Macrotermes bellicosus (Smeathman), Macrotermes sybhylinus (Rambur) and Odoniotermes horni (Wasmann) for Okitipupa, Akure, and AkungbaAkoko, respectively. fieldexposure tests for each of the locations suggested that density affected the resistance of the wood samples to termite attack. Wood in the high density class had a better resistance to attack by termites compared with low density wood. The severity of attack was highest in Akure and least in the Okitipupa location. Irrespective of wood density and location in Ondo State, Nigerian lumber should be treated before installation to ensure protection. 

 Global Journal Of Advance Engineering Technology And Sciences

 Journal

 Evaluation Of The Physical And Mechanical Properties Of Composites Board Made From Banana Stalk (Musa Sapientum) And Pozzolan

 Owoyemi J.M., Akinbote F. And Aladejana J.T.

 2017

The need to find alternative materials for the production of composites board has led to the use of biofibres among which include locally available banana stalk. These wastes are found Littering local food markets and constitute environmental pollution. The boards were fanned using mixing ratio of cement to pozzolan at 1:0, 1:1and 2:1. Physical and mechanical properties of boards produced from banana stalk using ordinary Portland cement and pozzolan as binders were investigated. The influence of fibre lengths (25 and 50 mm) and mixing ratio on Density, Water Absorption (WA), Thickness Swelling (TS), Linear Expansion, Modulus of Rupture (!V!OR) and Modulus of elasticity (MOE) were determined. The mean values for WA, TS and LE showed that, after water immersion for 24, 48 and 72 hours, W A, TS and LF decreased with increase in mixing ratio while observed board density increased with increase in mixing ratio. MOE mean value ranged between 473.21 and 2728.8N/mm2 while MOE values ranged between l .46 and 3.49 N/mm2. MOE and MOR increased with increase in mixing ratio. The study has shown that boards produced from banana stalk compared favourably with boards produced from other lignocellulosic materials and has provided avenue for recycling banana waste causing environmental menace. 

 Key Engineering Materials

 Journal

 Assessment Of Inorganic Bonded Paperboards Produced From Kraft And Recycled Newsprint

 Owoyemi J.M., Ajayi, B. And Ogunrinde O.S.

 2016

Homogeneous cement bonded paperboards were made with recycled newsprints and Kraft paper with ordinary Portland cement and curing reagent. Boards were produced at the blending proportions of 100:0, 50:50 and 0:100 respectively and at cement/paper ratio of 1:1, 2:1 and 3:1 respectively. Dimensional movements were evaluated to investigate the effect of the variables used in board manufacturing before and after exposure to accelerated aging test procedure. Increase in mixing ratio and blending proportion caused decrease in Thickness Swelling (TS) and Water Absorption (WA) while TS and WA of the untreated boards were lower than the accelerated aging treated boards. The dimensional movement of Kraft paper was higher than that of recycled newsprint before and after accelerated aging treatment. The strongest and most dimensionally stable board was produced at the highest level of cement/ paper ratio. The preaccelerated ageing test carried out showed that mechanical properties were higher 2: 1and 3: 1 paper cement mixing ratios. Kraft paper produced the strongest and most dimensionally stable board than: recycled newsprint. From this study Kraft paper and recycled newsprint proved to be suitable for the manufacture of cement bonded paperboard capable of meeting the needs in core and low cost housing construction. 

 ISROSETInternational Journal Of Scientific Research In Multidisciplinary Studies

 Journal

 Management Of Nigerian Forest Through Efficient Recovery Of Harvesting Residues

 Ogunrinde Olayemi Segun And Owoyemi Jacob Mayowa

 2016

Harvesting residue poses a lot of problem especially to the waste management authorities in Nigeria and as a disturbance to forest floors since it is not being used appropriately. Large quantity of wood waste is generated daily in harvesting and some other forest management operations which run into millions of Naira if recycled or properly used. This paper focused on wood harvesting practices, sources of harvesting residue, the percentage recovery and their potentials for future usage in other to be able to manage the forest sustainably. Available resources on this subject were critically reviewed. Findings revealed that large quantity of wood harvesting residue generated could be used for energy production, ceiling boards, Charcoal production, fuel wood, briquette and Pharmacognosis. This provides solution to increasing deforestation caused by overexploitation of the forest due to increasing demand for forest products thereby reducing pressure on the forest. It is evident however that not all forest industries, particularly in developing countries currently use harvesting and wood residues efficiently for energy.