Open Access Minireview Article

Determination of Energy Levels of a Quantum Bouncing Ball with the Numerical Support of Maple Computer Program

E. Omugbe

Physical Science International Journal, Page 1-5
DOI: 10.9734/PSIJ/2018/45915

The dynamics of the quantum bouncing ball under the influence of gravity has been studied. The Fourier transform techniques was first used to derive the wave function (Airy function) of the time-independent Schrodinger wave equation for a linear potential in the form of the well-known Airy integral. The asymptotic dependence of the Airy function was presented. In order to obtain the numerical solution of the energy levels of the “bouncing ball”, the power series method was first used to derive the Airy function in power series form. Subsequently, the energy levels were then computed with the support of Maple Software. The results are tabulated with the WKB (Wentzel, Kramers, and Brillouin) approximation calculations.

Open Access Original Research Article

Assessment of Natural Radioactivity and Associated Dose Rates in Surface Soils around Oluwa Glass Industry Environments, Igbokoda, Ondo State, Southwestern Nigeria

O. Ajanaku, A. O. Ilori, G. A. Ibitola, O. B. Faturoti

Physical Science International Journal, Page 1-13
DOI: 10.9734/PSIJ/2018/42372

Assessment of natural radioactivity and associated dose rates of surface soils in Oluwa Glass industry environment of Igbokoda, Ondo state, Nigeria was carried out by means of well-calibrated NaI(TI) that was well shielded with a detector coupled to a computer resident quantum MCA2100R multichannel analyzer with an aim to measure the concentrations of 40K,238U and 232Th radionuclides in the soil samples; estimate the absorbed dose rate, annual effective dose and excess lifetime cancer risk in the study area.

The activity concentrations in the soil samples were found to ranged from 153.74 to 228.13 Bq kg-1 with a mean value of 194.69 17.40 Bq kg-1 for 40K, from 9.40 to 14.07 Bq kg-1 with a mean of 11.49 ±2.10 Bq kg-1 for 238U and from 8.42 to 12.08 Bq kg-1 with a mean value of 9.94 ± 1.05 for 232Th respectively. The mean absorbed dose rate was 19.73 ± 18.43 nGyh-1, the annual effective dose was 24.20 ± 8.31 µSvy -1 and the excess lifetime cancer risk was 0.085. The activity concentration of 40K reported in the present study was higher than the value of 58.69 Bq kg-1 for 40K reported for soil samples collected from parts of Sagamu, Southwestern, Nigeria. The mean absorbed dose rate, mean annual effective dose and mean excess lifetime cancer risk reported in this present study were lower than the world average values of 54.00 nGyh-1, 66.00 μSvy-1 and 0.29 respectively. Thus, it can be deduced from our results, that 40K, 238U and 232Th naturally occurring radionuclides, to a very great extent, had already decayed to stable nuclei as at the time of carrying out this research on the chosen site at Igbokoda, Ondo State, Nigeria.

Open Access Original Research Article

A Semi-Qualitative Safety Assessment of the Central Radioactive Waste Management Facility in Tanzania Using Analytical Hierarchical Process

Vitus A. Balobegwa, Leonid L. Nkuba

Physical Science International Journal, Page 1-11
DOI: 10.9734/PSIJ/2018/44436

This study identified normal and abnormal conditions, features, events and processes (FEPs) those potentially influence the integrity and safety of the facility that might originate outside or inside the facility. Four hazards, namely terrorist activity, fire outbreak, floods and human intrusion were selected basing on the following criteria; physical reasonableness, probability of occurrence and potential consequences associated with the occurrence of these FEPs. With the use of Analytical Hierarchy Process (AHP), the FEPs were ranked for prevention and mitigation plan based on the following criteria: occurrence probability, potential impact and prevention/mitigation cost. The results show the terrorist activity as the most dangerous hazard to the facility. Terrorist activity has to be given first priority in risk reduction strategy followed by flood. The next are fire outbreak and human intrusion. The study recommended that the resources should be allocated at first to protect the damage of the central radioactive waste management facility from terrorist activity and flood.

Open Access Original Research Article

Geospatial Auto-correlation Statistical Analysis to Evaluate the Seismic Magnitudes and Its Implications on the Mediterranean Coastal Zone of Egypt

Ali Amasha, Islam Abou El-Magd, Elham Ali

Physical Science International Journal, Page 1-15
DOI: 10.9734/PSIJ/2018/46208

The northern coastal zone of Egypt (Mediterranean) is under the force of tension shear zones of African and European plates that generate earthquakes with variable magnitudes. We try to find a spatial relation between the collected seismic points and to evaluate how much these points affect and accelerate the frequencies of the high magnitudes’ earthquakes events. Geospatial and statistical analyses (e.g. ArcGIS tools) have used to analyze nearly 3083 earthquake records in the last 65 years in the Mediterranean basin in relation to the geo-tectonic shear zones. Nearly 85% of these earthquakes were in the marine. Aegean and Anatolia shear zones are the highest contributors of the earthquakes with nearly 43% and 42% respectively. Three results of the dominant geotectonic hazards were obtained. The first is that the majority of the hot spotted earthquakes are located at the Aegean Sea which enforcing the frequency and severity of earthquakes and tsunamis than that of Anatolia plate. The northward movement rate towards the African-Aegean plate is a bit lower due to the existing of the Mediterranean ridge and Strabo and Pliny trenches which resisting the African plate northward subduction. The second is that the subsidence rates and directions at the coastal Nile delta region is aligned to the rates and directions of the tectonic plates’ movements and the compaction rates of the deltaic sediments. The third is that the depths of the majority earthquakes epicenters (85%) were down to 40 km from the sea floor, one third of them were within the shallower 10 km depth. These results approve the frequencies of the severe earthquakes are potential based on the spatial statistical analysis. Therefore, the Egyptian coastal zone is vulnerability-marked where a lot of developmental activities were located.

Open Access Original Research Article

Spatial and Seasonal Variation of Volatile Organic Compounds (VOCs) in Ambient Air of an Open Dumpsite, Benin City, Southern Nigeria

J. M. Okuo, A. Ighodaro

Physical Science International Journal, Page 1-11
DOI: 10.9734/PSIJ/2018/42793

Volatile organic compounds in municipal solid waste dumpsites are considered as one of the major issues in recent years. Open burning is also very common, which emits volatile organic compounds and pose a serious threat to the associated environment. Air samples were collected by passive sampler (ORSA 5). The air samplers were mounted at a height of 1.5 – 2.0 m and sampling were carried out four times a month for a period of 12 months. The adsorbed VOCs were desorbed with carbon disulfide (CS2), and the solution analyzed using a Gas Chromatography (GC) instrument fitted with a flame ionization detector (FID). The results from the analysis of the air samples showed that twenty-six (26) VOCs were identified and quantified in the open dumpsite during the dry and wet seasons. The VOCs in the open dumpsite during the dry season were classified as follows: Alcohol 9%, aromatic 45%, halogenated compound 38%, ester, and terpinene 4% each. The levels of VOCs obtained in the studied areas in the dry season are 2 to 3 times higher than in the wet season. This may be attributed to metrological parameters and a greater number of anthropogenic activities such as storage and movement of waste, waste combustion, solvent discharge, vehicular exhaust, and petroleum product emissions. Principal component analysis revealed that the major sources of VOCs in the open dumpsite are mainly anthropogenic.