TECHNOLOGY ADAPTATION: DESIGN OF A CENTRIFUGAL CASTING HEAD.

Adesina, A. S. and Adegbite, D. A.

Department of Metallurgical Engineering

Kwara State Polytechnic, Ilorin, Nigeria

E-mail: adeflocy@gmail.com

ABSTRACT

The concept of centrifugal casting of metals is presented as a means of improving the soundness of metallic articles. The major principle of the process is enumerated. Main components of a centrifugal machine are highlighted and the conditions of exploitation and design of the mould are enumerated. Mould design for casting of 50 – 250mm cast articles are discussed based on appropriate design parameters.

*Kalli, B. M., Tijjani, B. G., Baba, U. T. and Kalli, S.

Department of Electrical and Electronics Engineering

Ramat Polytechnic Maiduguri, Borno State, Nigeria

babamaikalli@yahoo.com

ABSTRACT

The paper reviewed development of a control method for a renewable energy system with fuel cell.  A novel control method developed for the renewable energy system based on hydrogen and the control system is divided in two levels: a global controller that uses fuzzy logic to manage the flow of energy in the system and a pair of local controllers that are used to control the operating power of the fuel cell and the electrolyser. The finding shows that a single module of the boost converter can output 1250 W at an efficiency higher than 91 %. It was also expected that the entire boost converter, which was composed of 4 modules, could output at least 5 kW. Two control structures were compared for the local controller: a PI controller and a fuzzy logic controller. The performances of both controllers were similar, but since the PI controller is simpler to implement, it was retained as the best option.

REQUIREMENTS AND PROSPECTS FOR CONSUMERS OF ELECTRICAL ENERGY REGARDING DEMAND SIDE MANAGEMENT: A CRITIQUE.

Lawal, Abdur-Raheem Olasupo¹ and Sule, T. Kamal²

Department of Electrical / Electronic Engineering

Kwara State Polytechnic, Ilorin.

e-mail: lolasupo@yahoo.com, sulekamaldeentaiwo@gmail.com

ABSTRACT

Since the inception of oil crisis in the 1970s energy supply and utilization equations, particularly of the developed world have remained unbalanced. This has led to restructuring programs in electrical energy production and utilization. One of the tools devised for control and regulation of energy, especially in the United States was Demand Side Management (DSM). The paper assesses DSM as a tool for effective control of energy profile during peak period but with the introduction of programing to improve coordination. Loads are divided into DSM-able and non DSM-able. The paper is criticised on its title, introduction, methodology and context with the conclusion that classification of loads should be based on modules rather than items. 

INVESTIGATION OF THE EFFECT OF CHEMICAL ACTIVATION AND CHARACTERIZATION OF BONE CHAR: COW BONE

^*Gumus , R.H., Wauton, I and Aliu A. M

Department of Chemical and Petroleum Engineering

Niger Delta University, Wilberforce Island, Bayelsa State

Email: rhodagumus@yahoo.com

ABSTRACT

In this study, cow bone was carbonized at 800 ^oC in 4 hrs cooled to room temperature. The carbonized samples were impregnated with 0.1 M HNO₃ and HCl, before activation at 300 ^oC, 400^oC and 600 ^oC with varying time of 60 min, 90min and 120 min. Characterization on the activated bone char at 400 ^oC in 120 min showed highest iodine number (surface area) and adsorptive capacity of 739.43 mg/g , 707 mg/g and 0.5 g/g  HCl and HNO₃ respectively. FT-IR analysis showed functional groups such as amine, methylene, carboxylic, aldehyde etc on the non activated bone char. With the activating agents, new functional groups were indicated such as carbon-aromatic and alkyi halides without eliminating the former functional groups. The effect of activating temperature and time was more pronounced on iodine number (surface area), moisture content and ash content.

A RELIABILITY IMPROVEMENT PROPOSAL (RIP) MODEL FOR RELIABILITY ASSESSMENT OF ELECTRICAL DISTRIBUTION SYSTEMS

G.A. Ajenikoko

Department of Electronic & Electrical Engineering

Ladoke Akintola University of Technology, Ogbomoso

E-mail: ajeedollar@gmail.com

ABSTRACT

In Nigeria, the average interruptions that customers experience are very high and the degree varies from place to place, thus making it impossible to achieve a satisfactory degree of reliability in the power system. The need for an effective planning tool to evaluate alternative reliability improvement proposal in order to establish and prioritize reliability improvement recommendations for optimization of reliability performance of a power delivery system has necessitated the development of a Reliability Improvement Proposal (RIP) model. The model uses quantitative processes to optimize reliability performance expectations of both customers and regulatory authorities. This research paper focuses on a Reliability Improvement Proposal (RIP) model for reliability assessment of electrical power distribution systems. Seven major distribution systems-Ibadan, Ikeja, Ilorin, Port Harcourt, Kano, Kaduna and Benin were used as case studies. The development of the model started with identification and computation of major system reliability indices before and after the proposal. The changes in the system reliability indices and the weighting coefficients were then estimated using appropriate mathematical relations. The weighting coefficients show the extent to which the system reliability indices change when a RIP is suggested. The results of the RIP model showed that the system reliability indices has changed from 0.3433, 0.1198, 0.2291, 0.2629, 0.2352, 0.1964 and 0.0.4032 before the proposal to  0.9772, 0.9855, 0.9863, 0.9858, 0.9905, 0.9860 and 0.9793 after the proposal for Ibadan, Ilorin, Ikeja, Port Harcourt, Kaduna, Kano and Benin distribution systems respectively. The highest CAIDI weighting coefficient of 5.158 was recorded on Kano distribution system while the least SAIFI weighting coefficient of 0.0009214 was recorded on Ibadan distribution system as a result of the level of industrial activities of the city.  Kano distribution system has the least RIP value of -5.589 while Kano distribution system has the highest RIP value of 8.87 because of the level of power requirement of the city compared to any city in the case study.The results of this research paper will assist electrical power system engineers in making effective planning policies and prioritize reliability improvement recommendations so as to optimize reliability performance of electrical power system. 

MEASUREMENT OF RADIATION EXPOSURE TO PATIENTS DURING CHEST X-RAYS EXAMINATIONS AT LAUTECH TEACHING HOSPITAL, OSOGBO, SOUTH-WEST, NIGERIA.

¹Ajayi J.O, ¹Adedokun O. and ²Olabisi O

¹Department of Pure and Applied Physics

²Department of Science Laboratory Technology

 Ladoke Akintola University of Technology, Ogbomoso, Nigeria.

E-mail: simpleajayi@yahoo.com

ABSTRACT

Radiation doses received by patients during chest x-ray examinations were measured at the LadokeAkintola University of Technology Teaching Hospital, Osogbo on two different machines. Absorbed doses from full-size radiography were found to be within the acceptable limits for the posterior-anterior (P.A) view in adult and in children. The KV range for the two categories of patients, i.e. the adult and older children were recorded on the two generator types used, i.e. Phillips and Neo Diagnomax. The mean skin-entry doses of the patients x-rayed on the two generator types were obtained to be 64.18mrad and 61.46mrad for adult and children respectively on Philips generator, and 65.08mrad and 61.20mrad for adult and children respectively on Neo-Diagnomax.

LOOFAH (LUFFA CYLINDRICA, L.) BIODIESEL AS FUEL FOR DIESEL ENGINE

O.O. Oniya^a,*, A.I. Bamgboye^b

^aDepartment of Agricultural Engineering, Ladoke Akintola University of Technology, Ogbomoso ^bDepartment of Agricultural Engineering, University of Ibadan, Ibadan, Nigeria

E-mail: toyinprayer@yahoo.com

ABSTRACT

This study focussed on biofuel properties of biodiesel from loofah oil. Loofah oil was transesterified in a two-step transesterification process to produce ethyl-esters and glycerol. Biofuel properties of ethyl-esters were determined using ASTM Standards and compared with that of Automotive Gas Oil (AGO). Ethyl-ester yield of 80.0% was obtained from loofahoil. Same specific gravity of 0.88 was obtained for raw loofah oil and its ethyl ester was 1.023 times that of AGO. Higher viscosity at 40ºC (25mm²/s and 43.4mm²/s) was obtained for loofah ethyl ester and raw loofah oil respectively compared to 2.95 mm²/s obtained for AGO. Lower heating value (28.75 MJ/l) was obtained for loofah ethyl-ester compared to 30.2 MJ/l and 44.68 MJ/l obtained for raw loofah oil and AGO respectively. Lower amounts of sulphur, 9.13% for loofah ethyl ester and 10.41% for raw loofah oil than the reference AGO which was 61.8% were recorded. Higher pour (3ºC for both biofuels), cloud (7ºC and 8ºC) and flash (86ºC and 79ºC) points were obtained for loofah ethyl ester and the raw oil, respectively, compared to -16ºC, -12ºC and 74ºC respectively obtained for AGO. Loofah oil contained 76.46% of unsaturated fatty acids. Loofah ethyl ester had better fuel quality than raw loofah oil and fuel properties which are close to ASTM standards for diesel engine fuels.

EFFECT OF SUCTION PARAMETER ON VISCOSITY IN BOUNDED MHD BOUNDARY LAYER FLOW OVER A MOVING VERTICAL CYLINDER

Ajala O. A¹, Oderinu R. A. and Adepoju O. A.

Department of Pure and Applied Mathematics

Ladoke Akintola University of Technology, Ogbomoso, Nigeria

E-mail:segfed2074@yahoo.com, oaajala@lautech.edu.ng

ABSTRACT

We examined a Newtonian flow which gave insight into the theory of magneto-hydrodynamic (MHD). The flow problem considered shown that viscosity behave in three dimension depending on how the suction parameter depends on it.