HOD's Profile : Department of Agricultural and Environmental Engineering
DEPARTMENT OF AGRICULTURAL & ENVIRONMENTAL ENGINEERING
Head of Department’s Profile Page
Professor AbdulGaniy Olayinka RAJI
B.Sc.(Hons), M.Sc. (Ibadan), Ph.D. (Newcastle-upon-Tyne), M.N.I.A.E., M.N.S.E., M.A.S.A.B.E., M.N.I.F.S.T., Regd. Engr. (COREN)
Professor and Head of Department
Formerly: DIRECTOR, Management Information System and CHAIRMAN, Information and Communication Technology
Areas of Specialisation
Crop Storage & Processing Engineering, General Mechanization, Systems Modeling and ICT
Office: Room 17, Ground Floor,
Prof. Fola ABOABA Building. Department of Agricultural and Environmental Engineering
Tel: 00 234 (0) 803 585 0005
Current Research Projects
(a) Drying and Sorption Studies on Millet and Castor
There is dearth of information on the drying behaviour of castor while that of millet is limited to sorption of a few varieties. This work examined the moisture sorption and drying behaviour of the crops and found that drying occurred in the falling rate phase with Knudsen flow as the mechanism of moisture movement. These information are useful in the design of efficient drying systems for the crops.
(b) Mathematical Modelling of palm kernel oil expression using Screw press.
This study looked at some of the operational parameters that influence the efficiency of screw press; pressure, feeding rate and speed of rotation. Mathematical model was applied to determine the degree of influence of these parameters on performance of a screw press. Pressure was found to significantly influence oil yield while machine parameters have no influence on the free fatty acid. The use of mathematical model to describe the relationship between process variables and product characteristics encourage experimental design whereby maximum amount of information can be obtained from minimum number of experiments. The mathematical relationships obtained are useful in engineering designs.
(c) Development of a Computer Model for Management of Agricultural Wastes.
A software for determining and selecting appropriate management of waste at commercial level was developed and tested in this study. The model which was developed on a Visual Basic platform as the front-end with an interactive data input and output display screen shows that the algorithm, using appropriate data, is a useful tool in predicting management method for waste. It is also useful in pre-planning ever before the production and generation of waste having known the type of waste. It is therefore a reliable method as it considers all the necessary components and composition of waste in making prediction.
(d) Waste to Wealth: Briquette production from sawdust.
This study involved the development of a machine designed to combine ration of dried and sieved sawdust premixed with cassava starch paste of desired consistency to produce briquettes. The machine compresses the sawdust/starch mixture in moulds and the pressure was kept on the sawdust/starch mixture for a specified period of time. The dried briquettes are high grade products for cooking and heating purposes. The briquetting technology can be commercialized to form the basis of a business venture, thereby contributing to poverty alleviation in the country
(e) Effect of processing methods on the quality of Cassava Pellets.
Processing cassava onto pellets is a means of storage, minimizing quantitative and qualitative losses and obtaining an internationally acceptable and commercially rewarding cassava product. This study produced cassava pellets using three different processes and the samples investigated for storageability and nutritional qualities. The pellets produced from the modified process were better in terms of strength, durability, time of drying, appearance and nutritional quality compared to the cold pellets from the conventional process.
(f) Design of flash dryer for High quality Cassava Flour. A joint research work with IITA/RMRDC/RTEP/GODILOGO.
This study was on the design and fabrication of a new flash dryer by a team of Nigerian Engineers to produce high quality cassava flour from cassava mash. The dryer was constructed and installed at Godilogo Farms Limited and tested under industrial conditions. The energy consumption was found to be very economical with a very high throughput compared to corresponding values obtained from two existing flash dryers when the same cassava mash was used. The quality of the cassava flour produced from the new flash dryer falls within the acceptable Nigerian standards for this product.
II. In Progress
(a) Discrete Element Modelling of Agricultural Particulate Handling.
This research work is currently been extended to handling and transportation of perishable products. Studies have been completed on the storage and handling methods of perishable crops using tomato as a case study. Simulation and model prediction of the damages is now being studied with this method.
(b)Image Processing and Machine Vision in Agricultural Processing Operations.
This study has reached an advanced stage with trial tests on the determination of the leaf area index of cowpea. This is expected to be applied to the detection of damages during handling of agricultural and food materials.
(c) Waste to Health: Production of Medicinal Drugs from Agricultural Waste (Weeds).
This is a Senate Research Grant project that is currently at the level of design and installation of machines for size reduction.
(d)Engineering Properties of Cassava and Cassava Products.
An ongoing study on the effect of age on the engineering properties of cassava tubers and products. This study is expected to result in provision of information useful in machine design for tubers and the products.
III Dissertation and Thesis
(a) Discrete Element Modelling of the Deformation of Bulk Agricultural Particulates
(1) Raji, A. O. and J. C. Igbeka (1994). A Pedal Operated Chipping and Slicing Machine for Tubers. Journal of Agricultural Engineering and Technology . Vol. 2, 90 – 94.
(2) Favier, J. F; Abbaspour-Fard, M. H; Kremmer, M. and A. O. Raji (1999). Shape Representation of Axi-symmetrical, Non-spherical Particles in Discrete Element Simulation using Multi-element Model Particles. Engineering Computations: International Journal for Computer-aided Engineering and Software. Vol. 16, No. 4: 467-480.
(3) Raji, A. O. and J. F. Favier (2002). Discrete Element Modelling of the Impact Parameters of a Selected Fruit: Application. Journal of Applied Science and Technology. Volume 2, No 1: 6 – 13. Abstract: African Journal Online
(4) Raji, A. O. and J. F. Favier (2003). Discrete Element Modelling of the Compressive Loading of Bulk Agricultural Particulates: Parametric Studies. Journal of Modelling, Design and Management of Engineering Systems, Volume 2, Number 1: 1 - 13. Read Abstract
(5) Raji, A. O. and J. F. Favier (2003). Discrete Element Modelling of the Compressive Loading of a Selected Fruit: Model Validation and Effect of Damping. LAUTECH Journal of Engineering. Vol. 1, No 1: 17-25.
(6) Shittu, T. A; Awonorin, S. O. and A. O. Raji (2004). Evaluating some empirical models for predicting water absorption in African Breadfruit (Treculia africana) seed. International Journal of Food Properties, Volume 7, Number 3: 585 – 602. Abstract: IJFP
(7) Raji, A. O. and J. F. Favier (2004). Model for the Deformation in Agricultural and Food Particulate Materials under Bulk Compressive Loading using Discrete Element Method II: Compression of Oilseeds. Journal of Food Engineering. 64: 373 - 380. Read Abstract
(8) Raji, A. O. and J. F. Favier (2004). Model for the Deformation in Agricultural and Food Particulate Materials under Bulk Compressive Loading using Discrete Element Method I: Theory, Model Development and Validation. Journal of Food Engineering, 64: 359 - 371. Read Abstract
(9) Raji, A. O. and L. O. Alamutu (2005). Prospects of computer vision automated sorting systems in agricultural operations in Nigeria. Agricultural Engineering International: the International Commission on Agricultural Engineering (CIGR) Journal for Scientific Research and Development. Vol. VII: 1 – 7. Read Full Text: Adobe PDF.
(10) Raji, A. O. and D. I. Akaaimo (2005). Development and Evaluation of a Threshing Machine for Prosopis Africana Seed. Journal of Applied Science, Engineering and Technology, Volume 5, Nos 1 and 2: 56 - 62. Abstract: African Journal Online.
(11) Famurewa, J. A. V. and A. O. Raji (2005). Parameters Affecting Milling Qualities of Undefatted Soybeans (Glycine max L.. Merill) (1): Selected Thermal Treatment. International Journal of Food Engineering, Vol. 1: Issue 4, Article 6: 1-10. http://www.bepress.com/ijfe
(12) Raji, A. O. and J. A. V. Famurewa (2005). Parameters Affecting Milling Qualities of Undefatted Soybeans (Glycine max L. Merill) (2): Selected Physical Properties. International Journal of Food Engineering, Vol. 1: Issue 5, Article 6: 1-16. http://www.bepress.com/ijfe
(13) Akaaimo D. I. and A. O. Raji (2006). Physical and Engineering Properties of Prosopis africana pods and seeds. Biosystems Engineering Volume 95, Issue 2, Pages 197-205 (Formerly Journal of Agric Engineering Research). Read
(14) Raji A. O. (2006). An approach to determine the critical time-step in the discrete element modelling. Journal of Modelling Design and Management of Engineering Design, Vol. 4, No. 1, 21 - 31
(15) Raji A. O. and K. O. Oriola (2007). Packaging and handling methods as sources of mechanical damage in tomatoes in transit. Journal of Engineering and Applied Sciences 2(9): 1450 - 1454.
(16) Shittu, T. A; Raji, A. O. and L. O. Sanni (2007). Bread from composite cassava-wheat flour: I. Effect of baking time and temperature on some physical properties of bread loaf. Food Research International 40: 280 - 290.
(17) Adejumo and A. O. Raji (2007) “Technical Appraisal of Grain Storage Systems in the Nigerian Sudan Savannah”. Agricultural Engineering International: the International Commision on Agricultural Engineering (CIGR) Journal for Scientific Research and Development. Invited Overview No. 11. Vol. IX. September, 2007.
(18) B. A. Adejumo and A. O Raji (2007). The defects in thatched rhombus grain storage systems in Sudan savannah of Nigeria. LAUTECH Journal of Engineering and Technology, Vol. 4, No. 2, 57 - 59.B.A.
(19) Raji, A. O. and K. O. Oriola (2007). Development of a Yam Pounding Machine. Agricultural Mechanisation in Asia and Africa Vol. 38, No. 4. pp 77 - 81.
(20) Raji, A. O; Kanwanya, N; Sanni, L. O; Asiru, W. B; Dixon, A. and P. Ilona (2008) Optimisation of cassava pellet processing method. International Journal of Food Engineering. Vol 4, Issue 2, Article 5, pages 1 - 15. http://www.bepress.com/ijfe
(21) Raji, A. O. and J. A.V. Famurewa (2008). “Effect of Hull on the Physico-Chemical Properties of Soyflour”. Agricultural Engineering International: the International Commission for Agricultural Engineering (CIGR) E-Journal for Scientific Research and Development. Manuscript FP 07-018. Vol. X. December, 2008.
(22) Ahemen, S. and A. O. Raji (2008) Development and Performance Evaluation of a Motorized Rasping Machine for Tacca Involucrata Starch Production. Journal of Agricultural Engineering and Technology . 16(1): 52 - 63.
(23) Akinosho R., Raji, A. O. and J. C. Igbeka (2009) Effects of compressive stress, feeding rate and speed of rotation on palm kernel oil yield. Journal of Food Engineering. Vol 93, pages 427 - 430.
(24) Raji A. O. and Oon-Doo Baik (2009). Validation of the strength properties of avocado pear using discrete element modelling. UAE Journal of Engineering Research, 14(2): 1 - 7.
(25) Adejumo, B. A. and A. O. Raji (2009). The quality attributes of gari sold in Ogbomoso, Southwestern Nigeria. LAUTECH Journal of Engineering and Technology, 5(1): 18 - 21.
(26) Ilori, T. A., Raji A. O. and O. O. Kilanko. (2010). Some physical properties of selected vegetables. Journal of Agricultural and Veterinary Sciences ,. Vol. 2, 101 – 109. .
(27) Adejumo, B. A. and A. O. Raji (2010). An appraisal of packaging of gari and lafun in Ogbomoso, Southwestern. . Journal of Agricultural and Veterinary Sciences . Vol 2, 120 – 127...
(28) Ilori, T. A., Oradugba, O. B. and A. O. Raji (2010). Physical properties of Mexican sunflower seed. International Agrophysics, 25: 299 - 302. ..
(29) Ojediran, J. O. and A. O. Raji (2010) Thin layer drying of millet and effect of temperature on drying characteristics. International Food Research Journal , 17: 1095 - 1106 .
(30) RAJI, AbdulGaniy; Falade, K; Abimbolu, F (2010). Effect of sucrose and binary solution on osmotic dehydration of pepper varieties (Capsicum spp.). Journal of Food Science and Technology , 47(3): 305 - 309.
(31) Raji, A. O. (2010). The role of information and communication technology in extension and educational services for revitalising agriculture in Nigeria. Journal Agricultural Engineering and Technology, , Vol. 18, No 1: 90 – 100.
(32) Akinoso, R. and A. O. Raji (2011). Physical Properties of fruit, nut and kernel of Oil Palm. International Agrophysics 25: 85 – 88.
(34)Famurewa, J. A. V and A. O. Raji (2011). Effect of drying methods on the physico-chemical properties of soyflour. African Journal of Biotechnology. Vol. 10 No. 25: 5015-5019.
(36)Ilori, T. A., Oradugba, O. B. and A. O. Raji (2011). Physical properties of Mexican sunflower seed. International Agrophysics 25: 299 - 302.
(38) Raji, A. O; Asiru, W. B; Ojewumi, O. B. and J. C. Igbeka (2011).Heat treatment and loading orientation effects on mechanical properties of steamed cashew kernels (Anacardium occidentale). Agricultural Engineering International: International Commission for Agricultural Engineering (CIGR) Journal, Vol.13, No. 4, pp 1 - 12 Manuscript No. 1841.
(40) Akinoso, R., Raji, A. O. and J. C. Igbeka (2011). Influence of expeller design parameters on free acid content and colour of palm kernel (Elaeis guineensis) oil. Pakistani Journal of Science and Industrial Research (PJSIR) Series A: Physical Sciences, 54(2): 114 – 116. www.pjsir.org
(42) Shittu, T. A. and A. O. Raji (2011). Thin layer drying of African breadfruit (Treculia africana) seeds: modelling and rehydration characteristics. Food and Bioprocess Technologies. Volume 4, Number 2, Pages 224-231. DOI: 10.1007/s11947-008-0161-z.
(44) Ewemoje, T. A. and A. O. Raji (2011) Evaluation of the leaf area index of cowpea using empirical and image processing method (Vigna unguiculata) Journal of Engineering Research, Vol. 16, No 1: 42 – 52. (Nigeria)
(46) Adejumo, B. A. and A. O. Raji (2012). Microbiological safety and sensory attributes of Gari in selected packaging materials. Natural and Applied Sciences , Part I. Vol. 3, No. 3, 2223-9553.
(48) Jaiyeoba K. F and A. O. Raji (2012). Effects of Drying Temperature on The Effective Coefficient of Moisture Diffusivity and Activation Energy in Ibadan-Local Tomato Variety (lycopersicum esculentum). Journal of Information Engineering and Applications, Vol 2, No.4: 24 – 38
(50) Ilori, T.A., Dauda.,T.O., Raji, A. O., and O. O. Kilanko (2012). Occupational Mobility in Engineering Profession (Craftman and Artisan) in Oyo State, Nigeria. Global Advanced Research Journal of Engineering, Technology and Innovation (ISSN: 2315-5124). Vol. 1(9) pp. 252 - 258.
(52) Akinoso, R., Raji A. O., Oni, S. A. (2012). Work Index and Milling Efficiency of Size Reduction of Maize Using Plate Mill. Agricultural Engineering Today, 36(4): 22 – 28.
(54) Jaiyeoba K. F and A. O. Raji (2012). Osmotic dehydration pre-treatment for quality improvement in dried Nigerian Tomato. Journal of Agricultural Engineering and Technology (JAET). Volume 20, No. 1: 43 - 47.
(56) Badmus, A. A; Raji, A. O. and R. Akinoso (2013). Effect of Process Parameters on Work Index, Milling Efficiency and Some Technological Properties of Yam Flour Using Attrition Mill. Food and Bioprocess Technology, 6: 160 - 168. Published online in April 2012 on DOI 10.1007/s11947-012-0838-1
(58) Ojediran J. O., Raji, A. O. and H. I. Owamah (2013). Isosteric heats of water vapour sorption in two castor varieties. Journal of Chemical Engineering and Process Technology. 4(2): 1 - 6. http://dx.doi.org/10.4172/2157-7048.1000146.
(60) Ilori T. A., Raji A. O. and O. Kilanko (2013). Modelling some ergonomic parameter with machine parameter using hand powered maize sheller. Journal of Engineering and Technology Research. Vol. 5(3): 51-57.