Determination of Total Harmonic Distortion (THD) on a 33kv Distribution Network: A Case Study of Island Business District

Modern day AC power systems are proliferated by the introduction of several kinds of nonlinear loads which generate harmonics in a power system and this has a cumulative negative effect on power quality. Examples of nonlinear loads are power electronic devices, which cause distortion of voltage and current waveforms and consequently create a number of harmonics within the power system. This paper presents the estimation of Total Harmonic Distortion (THD) of the Distribution lines in the 33kV distribution network of Island Business District, Eko Electricity Distribution Plc, taken as a case study using a set of busbar voltage results, obtained from previous studies on power flow and harmonic analyses of each time of the 33kV feeder restoration. The harmonics and their impedances on each line at the scenario time of the 33kV feeders restored are presented. The estimated THD of each line and overall network average THD are also presented.http://dx.doi.org/10.4314/njt.v34i4.1

Mathematical Modelling of a Two – Link Planar Manipulator Arm Using The Denavit – Hartenberg Matrices

The Remote Manipulator System (R.M.S) is a typical example of a robotic manipulator. It is a two – link planar system which is made up of the base link (link 0), the upper arm link (link 1) and the end – effector or forearm link (link 2). The two joints are revolute and are respectively located at the shoulder and the elbow. In this work, frames are assigned to all the links; the direct and inverse kinematics modelling of the manipulator arm is also being discussed. The complete homogeneous transformation matrices relating gripper’s (generally known as the end – effector) frame with the base / reference frame have being derived using Denavit – Hartenberg matrix.Keywords: Manipulator Arm, Frame, Link, Joint, End – Effector, Mapping, Kinematics

Mathematical Modelling of a Two – Link Planar Manipulator Arm Using The Denavit – Hartenberg Matrices

The Remote Manipulator System (R.M.S) is a typical example of a robotic manipulator. It is a two – link planar system which is made up of the base link (link 0), the upper arm link (link 1) and the end – effector or forearm link (link 2). The two joints are revolute and are respectively located at the shoulder and the elbow. In this work, frames are assigned to all the links; the direct and inverse kinematics modelling of the manipulator arm is also being discussed. The complete homogeneous transformation matrices relating gripper’s (generally known as the end – effector) frame with the base / reference frame have being derived using Denavit – Hartenberg matrix.Keywords: Manipulator Arm, Frame, Link, Joint, End – Effector, Mapping, Kinematics.Journal of the Nigerian Association of Mathematical Physics, Volume 20 (March, 2012), pp 139 – 15

A Survey of Face Recognition Technique

A review of face recognition techniques has been carried out. Face recognition has been an attractive field in the society of both biological and computer vision of research. It exhibits the characteristics of being natural and low-intrusive. In this paper, an updated survey of techniques for face recognition is made. Methods of face recognition, such as, geometric, statistical and neu-ral networks approaches are presented and analyzed. The comparative performance of the vari-ous approaches is discussed.Keywords: Face recognition, Multilayer Perceptron, Statistical Approaches, Neural Network Approaches, Geometric Approaches, Biometric method