Archives-December 

Teaching of Physics at secondary level of education is most crucial. Secondary education is a decisive stage of individual’s entire academic tenure; at this level any ambiguity regarding concepts may deprive an individual intellectually and potentially. Keeping importance of physics in view this study was intended to develop module based on some innovative practices to teach physics effectively. The objectives of this research were to analyze the current methods of content presentation of physics, commonly used to teach in secondary level classroom and to develop a concept maps for content presentation of physics for secondary level students.

The Fourier-Finite Mellin transform is a variant of the Fourier transform; however, it certainly does not have as glorious or as predominant a history as the Fourier transform. This Fourier-Finite Mellin transform is used to correct various optical distortions, including noise in lenses, it is also used in radar classification of ships. Theoretically, the Fourier-Finite Mellin transform should provide a truly translation, rotation and scale invariant measure of an image. Fourier-Finite Mellin transform is frequently used in content-based image retrieval and digital image watermarking.The Object of the present paper is to prove an Inversion theorem for distributional Fourier-Finite Mellin transform with the help of two lemmas which are also given in this paper.

The kinetics of nickel leaching from lateritic Chromite overburden (COB) by organic (Oxalic) acid has been investigated. In this context, the effects of oxalic acid concentration and temperature upon the rate of nickel extraction from COB were evaluated. The leaching kinetics study was also performed for nickel extraction from thermally pre-treated COB, since nickel extraction was improved by the thermal pre-treatment of the COB. Well established shrinking core models were applied to study the kinetics of nickel extraction from raw and pre-treated COB. The experimental outcomes evident that, rates of nickel extraction from raw as well as the pre-treated COB were controlled by diffusion controlled shrinking core rate kinetics model. Further, apparent activation energies for extraction of nickel from raw and pre-treated COB were estimated to be 14.31 kJ/mol and 14.56 kJ/mol respectively.

Leiomyoma of the urethra is a rare benign tumor composed of smooth muscle tissue often overlooked by most practitioners. This tumor results in a variety of clinical signs, diagnosis is histological. This pathology can generates significant repercussions on the social life of the patient.

The concentrations of the toxic elements As, Cd, Hg, Sb and V in well and borehole water, samples from the Bibiani mining area in the Western Region of Ghana have been measured using instrumental neutron activation analysis (INAA) following irradiation with thermal neutrons and counting with a conventional counting system. This study was conducted to assess the impact of mining activities on the ground water resources of the Bibiani mining area. The concentrations of the elements measured in the rainy season water samples were in the ranges: As, 0.04 – 6.08 mg/L; Hg, 1.63 – 2.05 mg/L; Sb, 0,52 – 0.96 mg/L and V, 0.06 – 0.62 mg/L. The concentrations of Cd were below 0.01 mg/L (i.e. the detection limit) in all the rainy season samples. In the dry season samples, the concentration ranges of the various elements were: As, 0.67 – 4.71 mg/L; Cd, 0.35 – 2.80 mg/L; Hg, 0.30 – 4.93 mg/L; Sb, 0.08 – 0.70 mg/L and V, 0.07 – 0.52 mg/L. In the rainy season, the concentrations of As in 54% of the samples, Hg in 31% of the samples, and Sb in 23% of the samples were above their respective World Health Organization (WHO) limits whereas in the dry season water samples, the concentration of As in 31% of the samples, Cd in 62% of the samples, Hg in 23% of the samples and Sb in 15% of the samples were above their respective WHO limits. The pH values of all the water samples ranging from 3.90 to 5.93 pH units fell below the lower limit of the range 6.5 – 8.5, the WHO (1985) pH range for good quality drinking water. Therefore it could be concluded on this grounds that the wells and boreholes studied in Bibiani mining area were polluted hence not suitable for human consumption.

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The 21st century is griped with the challenge of effective management for the survival of any business organization. Managers and management scholars are left with the responsibility of exploring and adopting the best management approach in other to keep their organization in business. This paper is focused on management approach for effective management in the 21st century. The paper specifically weighed the four major management theories which include the scientific theories, Human Relations theory, the modern theory and the eclectic theory and, finally made Recommendation/ conclusion for the 21st century managers.

A numerical analysis is carried out to study the effects of mass transfer and thermal radiation on a steady boundary layer flow of a viscous incompressible electrically conducting fluid with uniform transverse magnetic field and variable free stream near a stagnation point on a non-conducting stretching sheet through a porous medium in presence of variable thermal conductivity, heat generation and viscous dissipation. The equations of continuity, momentum, energy and mass are transformed into ordinary differential equations and solved numerically using shooting method. The velocity, temperature and concentration distributions are discussed numerically and presented through graphs. Skin-friction coefficient, Nusselt number and Sherwood number at the sheet are derived, discussed numerically and their numerical values for various values of physical parameters are presented through tables.