Open Access Original Research Article

Numerical Simulation of One Step Block Method for Treatment of Second Order Forced Motions in Mass-Spring Systems

J. Sabo, T. Y. Kyagya, W. J. Vashawa

Asian Journal of Research and Reviews in Physics, Page 1-11
DOI: 10.9734/ajr2p/2021/v5i230157

This paper discuss the numerical simulation of one step block method for treatment of second order forced motions in mass-spring systems of initial value problems. The one step block method has been developed with the introduction of off-mesh point at both grid and off- grid points using interpolation and collocation procedure to increase computational burden which may jeopardize the accuracy of the method in terms of error. The basic properties of the one step block method was established and numerical analysis shown that the one step block method was found to be consistent, convergent and zero-stable. The one step block method was simulated on three highly stiff mathematical problems to validate the accuracy of the block method without reduction, and obviously the results shown are more accurate over the existing method in literature.

Open Access Original Research Article

Estimation and Investigation of Mean and Most Probable Velocities of Tropospheric Gases over Ilorin, Nigeria

D. O. Akpootu, D. E. Ohaji, I. Nouhou, M. I. Iliyasu, M. B. Abubakar, A. O. Aina, M. Idris, W. Mustapha

Asian Journal of Research and Reviews in Physics, Page 12-18
DOI: 10.9734/ajr2p/2021/v5i230158

In this study, the monthly average minimum and maximum temperature meteorological data obtained from the European Centre for Medium-Range Weather Forecasts (ECMWF) during the period of thirty eight years (1979 – 2016) were used to estimate the mean velocity and most probable velocity of atomic Oxygen and Hydrogen for Ilorin. The values of the mean velocity and most probable velocity for these atoms were compared to the value of escape velocity. The results revealed that the highest values of mean velocity and most probable velocity for atomic Oxygen were found to be in the month of March with  and  respectively and the highest values of mean velocity and most probable velocity for atomic Hydrogen were found to be in the month of March with  and  respectively. Based on the values of the mean velocity and most probable velocity for atomic Oxygen and Hydrogen obtained during the studied period suggests that these atoms cannot escape the gravitational field as their values are less than the escape velocity .

Open Access Original Research Article

Holographic Dark Energy and Dark Matter Interaction in Anisotropic Bianchi Type-V Universe

D. Gemici-Deveci, E. Aydiner

Asian Journal of Research and Reviews in Physics, Page 19-31
DOI: 10.9734/ajr2p/2021/v5i230159

In this study, we consider an holographic dark energy and dark matter interacting model in the Bianchi Type-V universe with a stretched exponential scale factor. We obtain the Hubble, shear, deceleration, and equation of state parameters based on the presented model and give the numerical solutions. We show that the anisotropy in the early universe plays an important role in the time evolution of the universe. Furthermore, we show that an interacting anisotropic model with stretched exponential scale factors can explain all epochs of the universe.

Open Access Original Research Article

Assessment of Outdoor Gamma Exposure Level of Some Swampy Agricultural Soils of Nasarawa West, Nigeria

Abdullahi A. Mundi, Idris M. Mustapha, Rabo Maikeffi

Asian Journal of Research and Reviews in Physics, Page 32-41
DOI: 10.9734/ajr2p/2021/v5i230160

In this study, assessment of outdoor background exposure levels in some selected swampy agricultural soil in Nasarawa West, Nigeria has been conducted. An in-situ measurement of outdoor background exposure rate (in mRhr-1) for a total of fifty farms (ten each from Keffi (KF), Kokona (KK), Karu (KR), Toto (TT), and Nasarawa (NS))  were  done  using  a  well  calibrated  portable  halogen-quenched  Geiger  Muller  (GM)  detector (Inspector alert Nuclear radiation monitor SN:3544). A geographical positioning system (GPS) was used at an elevation of 1.0 m above ground level to obtain the geographical location.  The radiological hazard parameters were evaluated using the measured outdoor background exposure rates.  The values obtained were compared with recommended permissible limits to ascertain the radiological hazard status of the swampy agricultural farms.  The  mean  values  of  the  outdoor  background  exposure  levels (0.23, 0.038, 0.028, 0.022, and 0.039 mRh-1), absorbed dose rates (458.49, 334.95, 188.79, 194.01,  and 343.65 nGyh-1) and excess lifetime cancer risk (1.968, 1438, 0.810, 0.832, and 1.475)  each for KF, KK, KR, TT, and NS respectively, are higher than the  recommended  safe  limits  of  0.013  mRh-1,  84.0  nGyh-1,  0.00029 respectively  as  recommended by UNSCEAR and ICRP. On the other hand, the mean annual effective dose equivalent (AEDE) values (0.563, 0.410, 0.232, 0.238, and 0.421 mSvy-1 for KF, KK, KR, TT, and NS respectively) are below the recommended permissible limits of 1.00 mSvy-1 for general public exposure. Generally, the study revealed that swampy agricultural soils in Nasarawa west are radiologically safe with little contamination which could be attributed to the geological formation and partly due to human activity in the area.