Open Access Short Research Article

Investigation of Field Induced Effect of High Voltage Transmission Line in Calabar South, Nigeria

P. O. Ushie, D. J. B. Pekene, E. O. Obi, K. E. Ukhurebor

Physical Science International Journal, Page 1-9
DOI: 10.9734/PSIJ/2017/32022

Due to increase in energy cost of transmission, high voltage transmission becomes the most economical for the transfer of large amounts of electrical power, because the higher the transmission voltage, the more efficient and cheaper the transmission. Due to increase in population, the towns are expanding, and naturally result in the construction of buildings near high voltage power lines. This research gives an in depth analysis of fields emitted by 11 kV and 33 kV power line and also describes in details the points where the highest field emission (at distance of 50 m, 1.17 µT is recorded for magnetic field around 11 kV power line and beneath the power line a field of 0.82V/m was recorded for electric field) and compares measurements of this fields with the international standard threshold values of 5V/m and 0.1 µT for the public. The magnetic field shows field/health effect as its exceeds the threshold value at some point while the electric field at all points is still below the limit as recommended by International Commission of Non-Ionizing Radiation Protection (ICNIRP).

 

Open Access Original Research Article

Open Access Original Research Article

Filter Design and Applications in Image Improvement

T. Mongy, Montaser Tharwat Alaaeldin

Physical Science International Journal, Page 1-11
DOI: 10.9734/PSIJ/2017/33413

This work presents the performance analysis of different basic techniques used for the image restoration. Restoration is a process by which an image suffering from degradation can be recovered to its original form. Removing the noise from the image is the scope of this work. The work implemented different techniques of image enhancement and noise removal. The degraded images have been restored by the use of different mathematical filters.

A new approach using MATLAB software was designed to improve the image and suppress the noise. The code was executed to eliminate the image degradation and avoid the loss of information. The use of the code enables easy extraction of data from the images.

 

Open Access Original Research Article

Hilbert Scheme and Multiplet Matter Content

T. V. Obikhod

Physical Science International Journal, Page 1-8
DOI: 10.9734/PSIJ/2017/34248

Development of the concept of Euler characteristic, from the Euclidean geometry to the algebraic geometry is considered. A singular toric variety is studied within the framework of the algebraic geometry. Procedure of the blowing up of its singularities in terms of cones is represented by Hilbert scheme. Special cases of the blowing up of orbifold singularities of  using Nakamura’s algorithm are performed. Hilbert schemes and their physical interpretation in terms of Euler characteristic are presented.

 

Open Access Original Research Article

Dynamic Modeling of a 3-DOF Articulated Robotic Manipulator Based on Independent Joint Scheme

Emmanuel C. Agbaraji, Hyacinth C. Inyiama, Christiana C. Okezie

Physical Science International Journal, Page 1-10
DOI: 10.9734/PSIJ/2017/33578

Joint torque control of a robotic manipulator requires a close dynamic description model involving the non negligible dynamics of the subsystems making up the system. The mathematical model for joint torque control of the robotic manipulator has been identified as one of the major sources of failures of commercial robots. The manipulator is basically made up of links connected by joints, and the torque that moves the links connected to a joint is produced by the joint actuator and also in practice, the control law is fed into the actuator inputs, therefore the actuator dynamics becomes non negligible dynamics in the dynamic modeling of the manipulator for robust joint torque control. Hence, a complete dynamic model of the manipulator which involves the link dynamics plus actuator dynamics was proposed. This paper focuses on the modeling of a 3DOF articulated manipulator based on independent joint (decentralized) scheme and the determination of the viscous damping coefficient for the joint torque control model. The independent joint model provides closer mathematical description of the manipulator and also enhances robust controller design. Joint damping coefficient B, was determined through experiment based on bode plot of the open loop gain. From the results, it was concluded that joints I and II achieved the best performance when B is 0.001N.m/rad /sec and 0.01N.m/rad /sec respectively.