http://repository.fuoye.edu.ng:80/handle/123456789/113 2026-04-16T04:16:54Z http://repository.fuoye.edu.ng:80/handle/123456789/1332 Title: COMPARISON OF CALCULATED WORK FUNCTION OF ELEMENTS EXPRESSED IN TERM OF FERMI ENERGY AND DENSITY OF FREE ELECTRON WITH OTHER METHODS Authors: ADEBAYO SAMUEL, FADAHUNSI; Olubosede, O. Dr. Abstract: The purpose of this project is to derive an expression for work function expressed in terms of Fermi energy and electron density parameter. This approach is referred to as the Metallic Plasma Model. After calculating the work function of metals using this approach, the result gotten are then analyzed and compared to the experimental values of work function for these metals. Also, the results gotten from this approach for each metal is compared to that which was gotten using other approaches such as SJM- Simple Jellium Model and Ab- initio method. 2015-09-01T00:00:00Z http://repository.fuoye.edu.ng:80/handle/123456789/1296 Title: CONSTRUCTION OF A 2KVA MODIFIED SINE WAVE INVERTER WITH AN IN-BUILT CHARGE CONTROLLER Authors: FAGITE, OLUWATOYIN OLUWAKEMI Abstract: The purpose of this project is to design and construct a 1600W (2kVA), 220V inverter at a frequency of 50Hz. This device is constructed with locally sourced materials of regulated standards. The basic principle of its operation is a simple conversion of 12V Direct Current (DC) from a battery using semiconductors at a frequency of 50Hz, to a 220V Alternating Current (AC) across the windings of a transformer. An additional power supply to the public power supply having the same power output is thus provided at an affordable price. This project is based on the design of 2kVA (1.6 kW) inverter system and incorporate the use of switching scheme automatic voltage regulator. The inverter is set to shut-down if the threshold voltage of 11.5V (Min.) is reached and more 13.5V (Max.) during the charging. The switch mode of a modified wave-switching scheme uses an astablemultivibrator to switch on the semiconductor switches-Metal Oxide Semiconductor Field Effect Transistor (MOSFET). 2015-10-01T00:00:00Z http://repository.fuoye.edu.ng:80/handle/123456789/1127 Title: A RADIOMETRIC MAPPING OF FEDERAL UNIVERSITY OYE - EKITI MAIN CAMPUS, SOUTHWESTERN NIGERIA Authors: ADEJUGBAGBE, TAIWO Abstract: The radiometric mapping of Federal University Oye-Ekiti Main Campus along Are-Afao Locality was carried out in this study. For this purpose, measurement of the radiation levels were done along 11 major traverses covering the entire developed area of the Campus. The measurement were carried out by means of a very sensitive portable DSM- 500 Geiger Mueller Survey Meter, with serial number 10005. The results obtained showed that the global average of radiation level for Federal University Oye-Ekiti Main Campus was 0.055µSv/hr translating to an annual dose rate of 0.482mSv/yr which falls below the world average dose limit of 2.4mSv/yr for environmental background radiation as reported by UNSCEAR, ICRP ( 2015-10-01T00:00:00Z http://repository.fuoye.edu.ng:80/handle/123456789/1110 Title: Proton induced X-ray emission analysis of soils with various length of fallow: The effect on soil total elemental composition Authors: Inyang, E.P.; Oketayo, O.O.; Obiajunwa, E.I. Abstract: Fallowing of whatever kind is beneficial to elemental (nutrients) recovery. To what length (years) should a land be left fallowed for optimum elemental recovery is of serious concern to stakeholders owing to the limited availability of land. This work aimed at accessing the effect of fallow duration on soil total elemental composition. Proton induced X-ray emission (PIXE) technique has been used to assess the effect of relative longer length of fallowed land on soil total elemental composition using a 5SDH Tandem Pelletron accelerator available at Centre for Energy Research and Development, Obafemi Awolowo University Ile-Ife. The results at a 2.5 MeV energy revealed the presence of elements: Si, P, Ca, Ti, Mn, Fe, Zn, Rb and Zr with the only sharp difference being the fact that elements Zn and Rb were only detected in the soil of continuous cropping probably due to the agrochemical applications prevalent in the study area. The inter-elemental correlation trend revealed a significant positive correlation of P to Ti and Cr (.916 and .937) at P < 0.05 level of significance. A similar trend was obtained for Ca to Mn and Zr (.955 and .925). There was a very strong positive significant inter elemental correlation between Ti and Cr (.994) at P < 0.01 level of significance. On the whole, leaving a land fallow for a relative longer period of time is beneficial in nutrients replenishment. 2015-10-16T00:00:00Z http://repository.fuoye.edu.ng:80/handle/123456789/1073 Title: Assessment of Radiation Emission from Waste Dumpsites in Lagos State of Nigeria Authors: Olubosede, olusayo; Akinnagbe, .O.B .; Adekoya, O Abstract: This paper takes a look at the total radiation emanating from waste dumpsites in two cities of Lagos state Nigeria. This was achieved using a radiation survey meter (RADALERT50) t o measure the radiation exposure rate in micro sievert per hour (μSvhr - 1 ). Readings were taken by placing the detector at gonad level i.e. about 1 meter above the ground level in five sampling locations; this was done at an interval of 5meters away from th e point of reference up to 30 meters. The results obtained revealed that the annual absorbed dose rate measurements taken inside the five dumpsites are 29.80μSvhr - 1 , 28.05μSvhr - 1 , 19.29μSvhr - 1 , 17.53μSvhr - 1 and 15.78μSvhr - 1 . This is far lower than the aver age of 70μSvhr - 1 recommended by UNESCO on effect of Atomic Radiation 2012-05-08T00:00:00Z