Table of Contents

Factors Responsible for Low Enrolment of Students in Agricultural Engineering:

A Case Study of Taraba State College of Agriculture, Jalingo

Kesiki, W.B. and Yani, J.P.                                                                                                        1-11

Kinetic Model for the Copolymerization of Methyl Acrylate and Propylene

Wauton, I. and Gumus, R.H.                                                                                                    12-19

The Optimization of Natural Gas for Power Generation in Nigeria:

A Sustainable Synergy with Other Options

Koso I. Idigbe and P N. Onwuachi-Iheagwara                                                                         20-34

 

Evaluation of Tensile Strength of Heat Treated AISI 304 Stainless Steel with

Automated Ball Indentation (ABI) Technique

A.U. Iwuoha                                                                                                                             35-44

The Role of Engineers in Combating the Effect of Climate Change in Africa

Odu O. Godwin                                                                                                                        45-57

Power System Simulation Model Based on Probability Analysis

Chukwuagu I. and B.O. Anyaka                                                                                               58-66

Structural and Optical Properties of Electrodeposited CdS Thin Film

D. G. Diso, M. A.Y. Hotoro, T. S. Bichi and I. M. Dharmadasa                                                  67-76

Investigation on the Effectiveness of Some Amino Acid Derivatives in

Retarding NST 44 Mild Steel Corrosion in Some Agro-Fluids

M. Alagbe                                                                                                                                77-84

Design and Modelling of Strategic Information System

Okpeki U. Kazeem and Adebari F. Adebayo                                                                            85-94

Construction Work Items’ Unit Rate Estimation Model for Building

Contractors’ Projects Pricing in Nigeria

Inuwa I. Ibrahim, Iro A. IbrahimandDantong J. Sam                                                              95-103

Modest Residential Building Cooling Load Components Analysis

Ibrahim, U.H., A.A. Baba and Idris, M.H.                                                                                  104-112

 

Studies on Effects of SMAW Variables on Corrosion Resistance of Austenitic

Alloy Welded Joints in Hydrochloric Acid (HCl) Medium

A.U. Iwuoha and I. A. Ezenugu                                                                                                            113-124

Minimizing Materials Wastage in Construction- A Lean Construction Approach

K. Agyekum, J. Ayarkwa and T. Adjei-Kumi                                                                            125-146                                                                                                                                           

Physiochemical Characterization of Algae Oil from Microalgae of Nike Lake Enugu

Ejim, I. F.1 and Kamen, F.L.2
1Department of Chemical Engineering, Institute of Management and Technology Enugu State.
2Department of Chemical Engineering, Federal University of Technology, Owerri, Imo State.
E-mail: ijkeejim@ yahoo.com, felyleby@yahoo.com
ABSTRACT: Algae have emerged as one of the most promising sources of oil when grown in
C02 enriched environment. In this experiment, algae oil extract from microalgae samples
collected from Nike Lake was subjected to basic characterization analysis. The physicochemical
properties of the produced oil were measured and compared to the properties of soybean oil and
other oil seeds. Results showed that saturated fatty acid; oleic gave higher percentage (36%)
while other properties obtained were density (0.892 g/cm3), pH (4.6-5.0). refractive index (1.5),
saponification value (200g), acid value (1.9g), free fatty acid value (0.96%), iodine value (100-
120), cloud point (100C), pour point (5-80C), flash point (1100C) and moisture content (0.85%)
freezing points (31-400C) and greenish yellow in colour. Many of the properties of the algae oil
are comparable with those of soybean oil and other oil seeds.

Frequency-Based Design of Internal Model Controller Using the Method of Inequalities

Alabi, S.B.
Department of Chemical and Petroleum Engineering
University of Uyo, Uyo, Akwa Ibom State, Nigeria.
E-mail: sundayalabi@uniuyo.edu.ng, uniquebola@yahoo.com
ABSTRACT: In the traditional frequency domain design of an internal model controller, the
design problem is cast in terms of 2 H and  H norms of sensitivity functions in order to
obtain the parameters of a robust controller for an uncertain system. This requires the use of
weights, which are often obtained in a cumbersome trial-and-error manner. In this paper, a
computer-aided robust internal model control design method which eliminates trial-anderror
selection of weights was formulated within the context of the method of inequalities
(MoI). Lead, lag and lead-lag networks were used as weights and the model uncertainty was
described both in exact and norm-bounded forms. The robust stability and performance
criteria of the feedback system were defined as a set of algebraic inequalities. Moving
boundaries process (MBP), a search algorithm, was used to automatically and
simultaneously obtain the parameters of the controller and the weights which satisfy the
performance criteria. An uncertain system from the literature was chosen to illustrate the
new technique. The MoI-based method gave rise to internal model controller filter
parameters which in most cases are in close agreement with the filter parameters obtained
using the traditional trial-and-error method. Furthermore, the uncertainty weights obtained
via the MoI-based method are of lower order in comparison with those obtained via the
tedious trial-and-error method. It is concluded that the MoI-based method can effectively
replace the trial-and-error method for the frequency-based design of internal model
controller.