Table of content

Effect of Suction Parameter on Viscosity in Bounded Mhd Boundary

Layer Flow over a Moving Vertical Cylinder

Ajala O. A, Oderinu R. A. and Adepoju O. A.……………….……………………………………………                     1-7

Loofah (Luffa Cylindrica, l.) Biodiesel as Fuel for Diesel Engine

O.O. Omiya and^, A.I. Bamgboye………………………………………………………………………………….                   8-18

Measurement of Radiation Exposure to Patients during Chest X-Rays Examinations

at LAUTECH Teaching Hospital, Osogbo, South-West, Nigeria

Ajayi J.O, Adedokun O. and Olabisi O………….…………………………..…….…………………………….              19-25

A Reliability Improvement Proposal (Rip) Model for Reliability Assessment of

Electrical Distribution Systems

G.A. Ajenikoko…………………………………………………………………………………………………………………       26-33

Investigation of the Effect of Chemical Activation and Characterization of

Bone Char: Cow Bone

Gumus , R.H., Wauton, I and Aliu A. M.……………………………………………………………………..…                34-45

Requirements and Prospects for Consumers of Electrical Energy Regarding

Demand Side Management: A Critique.

Lawal, Abdur-Raheem Olasupoand Sule, T. Kamal……………………………………………………                      46-51

Development of a Control Method for a Renewable Energy System with Fuel Cell:

A Review

Kalli, B. M., Tijjani, B. G., Baba, U. T. and Kalli, S.…………………………………………………………..               52-62

Technology Adaptation: Design of a Centrifugal Casting Head.

Adesina, A. S. and Adegbite, D. A.………………………….……………………………………………….……             63-68

Assessment of Maintenance Cost for Public Buildings in Bauchi State

Gambo M. J.; Usman N. D.; Ashen, M. J. and Akoh S.E.………………………………………..…..                69-76

Risk Allocation Preference in Public-Private Partnership Infrastructure Projects

in Nigeria

I.Y. Mohammed; K. Bala and S.U. Kunya.………………………….………………………………….………              77-88

Telecommunication Sector Transformation in Nigerian

Efenedo, Gabriel I. and Otuagoma, Smith O.………….………………………………….………………                89-96

Security of Database Contents Using Transparent Data Encryption in

Microsoft SQL Server Enterprise Edition

Rashid Husain………………………….……………………………………………………………………………….……              97-108

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.