European Journal of Engineering Science and Technology https://dpublication.com/journal/EJEST <p>European Journal of Engineering Science and Technology (EJEST) is a peer-reviewed, open-access journal that provides rapid publication of articles in all areas of Engineering Science and Technology. EJEST is an international, scholarly and peer-reviewed journal (online) published Quarterly by Diamond Scientific Publication.</p> Mokslinės Leidybos Deimantas (Diamond Scientific Publication) en-US European Journal of Engineering Science and Technology 2538-9181 General Solution of Thick Plates on Winkler-Pasternak Foundation Using Orthogonal Polynomial Displacement Functions https://dpublication.com/journal/EJEST/article/view/591 <p>A solution for thick plates on Winkler-Pasternak foundation using characteristic orthogonal polynomials (COPs) displacement functions was presented in this study. A shear deformation function was developed from Soldatos’ (1992) trigonometric function and the Ritz energy approach was used to determine the total potential energy of the thick plate on elastic foundation. This method presents a simple and efficient method where only definite integration is required to obtain solutions. Results for non-dimensional in-plane and out-of-plane displacements for simply supported (SSSS) thick plates were presented and was observed to converge with that of other third-order shear deformation theories (TSDT) available in literature. From the study, it was observed that the in-plane and out-of-plane displacements reduced generally as the foundation modulus of the soil increased and decreases as the span-depth ratio increased for each aspect ratio. Both the Winkler and Pasternak foundation parameters influenced the results obtained as the foundation modulus is dependent on these parameters.</p> franklin uzodinma Onodagu P. Dinwoke Aginam C. Henry Ubani U. Obinna Copyright (c) 2021 European Journal of Engineering Science and Technology 2021-12-20 2021-12-20 4 4 1 14 10.33422/ejest.v4i4.591 Nuclear Reaction Mechanisms of Neutron Induced Fission of 237Np Nucleus https://dpublication.com/journal/EJEST/article/view/600 <p>At FLNP JINR Dubna new prospects for developing new neutron facilities have already been started, that will replace the IBR-2 neutron pulsed research reactor which shut down in the year 2032. Several agreed projects use the fission processes induced by neutrons on neptunium-based fuels. An investigation of the neutron fission process on the <sup>237</sup>Np nucleus was conducted in the present research. Several parameters were analyzed during neutron-induced fission of <sup>237</sup>Np including the neutron cross-section, mass distributions, prompt neutron emission, isotope production, and neutron spectra. Evaluations of the above observables were conducted using TALYS – 9.1 Software, with incident neutron energies ranging from 0.4 to 25 MeV. The exact value of cross-section was obtained as 5 – 5.5 MeV in the present work, whereas from literature, it was found up to 10 MeV. Neutron spectra were analyzed and separated contributions from different nuclear reaction mechanisms were obtained. Our investigations have revealed some important yields and isotope production cross-sections that were in good agreement with literature data.</p> Cristiana Oprea Mohammad Ayaz Ahmad Alexandru Ioan Oprea Jalal H. Baker Naima Amrani Copyright (c) 2022 European Journal of Engineering Science and Technology 2021-12-20 2021-12-20 4 4 15 24 10.33422/ejest.v4i4.600 Soil Loss Estimation within the Nun River Basin using Revised Universal Soil Loss Equation (RUSLE) integrated in Geographic Information Systems (GIS) https://dpublication.com/journal/EJEST/article/view/514 <p>River bank erosion can cause undesired river bank expansion, distortion of the river course thereby slowing the river velocity and hindering the water carrying capacity of the river. Slow velocity of the river course can result in fast sediment accretion and accumulation at the bottom of the river. If these trends are not checked, the river may wind down and at best begin to become a delta at its middle course. The focus of this study is to apply GIS&nbsp; and analytical RUSLE equation to estimate soil loss within the Nun Basin.</p> <p>Core sediment samples were collected from relatively undisturbed areas (nine different stations) using Uwitec Triple sediment cutter. The sediment samples were processed in the lab for sediment particle size analysis (PSA) and Pb-210 atmospheric deposition with age using alpha spectrophotometer. Spatial rainfall data of the study location were employed to generate the rainfall erosivity map in order to determine the erosivity factor (R). Particle size distribution analysis was validated using Scanning Electron Micrograph (SEM) and integrated with Geographic Information Systems (GIS) was employed to create the soil erodibility map which was subsequently used to determine the erodibility factor (K). The cover management factor (P) was determined using the land use land cover map and the resulting data were then employed to model the river bank erosion around the study area.</p> <p>Result of the study revealed that the maximum annual average soil loss rate was estimated to be 0.66 tons/ha. /year around the Nun River based on GIS application using the Revised Universal Soil Loss Equation (RUSLE).</p> Jacob Ehiorobo Rudolph Idowu Ilaboya Nelson Onwo Copyright (c) 2022 European Journal of Engineering Science and Technology 2021-12-20 2021-12-20 4 4 25 42 10.33422/ejest.v4i4.514 Effect of Molasses on the Strength and Workability of Concrete with Cement Partially Replaced by Saw Dust Ash (SDA) https://dpublication.com/journal/EJEST/article/view/691 <p>This study aimed at investigating the effect of molasses on the workability of concrete with Saw Dust Ash (SDA) as partial replacement of Ordinary Portland Cement (OPC) in normal strength concrete of C25/30. Concrete samples with varying percentages of SDA, Molasses by weight of cement was made, cured at 28 days and tested for workability and strength. Results of the study indicated that the slump values increased linearly with increase in percentage of molasses from 0.1% to 0.20% respectively. The 0.15% of molasses added to 10% replacement of cement with SDA gave a slump of 110 mm along with the highest Cylinder strength result of 30.2 Mpa at 28days. From the study, it was seen that the slump values remained in the range of 100-110mm for 0.10% and 0.15% of molasses added and this implied that molasses can maintain acceptable workability of concrete up to 0.15% by mass of cement.</p> NANDUGWA HARRIET MUBIRU JOEL IZIMBA GEORGE Byamukama Jonas Copyright (c) 2022 European Journal of Engineering Science and Technology 2021-02-21 2021-02-21 4 4 43 56 10.33422/ejest.v4i4.691