Adama University

About: Adama University is a education organization based out in Nazrēt, Ethiopia. It is known for research contribution in the topics: Population & Adsorption. The organization has 840 authors who have published 1010 publications receiving 5547 citations. The organization is also known as: Adama Science and Technology University & ቴክኖሎጂ ዩኒቨርሲቲ, አዳማ ሳይንስና ቴክኖሎጂ ዩኒቨርሲቲ.

Development and Characterization of Calcium Oxide Nano-Particle from a Household Waste (Chicken Eggshell) in Mubi, Adamawa State Nigeria

Abstract: CaO nanoparticle was synthesized from a chicken eggshell by the means of Chemical Co-precipitation of wet chemical synthesis method and this process basically be classified under the Bottom-Up process of production of nanopartiles. This shows the utilization and recycling of household wastes and the recycling process may also be performed on other household waste. XRF shows the total composition of 98.64%. This shows the perfection, precision and accuracy of the procedure utilized during the processes. The elemental composition shows that the Ca is with 56.65% and 43.35% oxygen. SEM analysis shows that the particle size is nearly cubic in shape and the approximate size of the particle was calculated using Debey Scherrer equation and found to be 23.76nm. The Energy Dispersive spectroscopy of the substance shows the highest optical dispersion of Ca at 3.5keV while oxygen shows optical dispersion at 0.50KeV. Thermogravimetric analysis shows that the synthesized particle is thermally stable, 50% of the particle show perfect stability even at temperature of 950 o C. FTIR analysis of the synthesized particle shows a very limited signals on the absorption band and this clearly indicates the total conversion of the main components of eggshell (CaCO 3 ) into CaO nanoparticle.

Prey-Predator Model for Awash National Park, Oromia, Ethiopia and Its Stability Analysis with Simulations

Abstract: In this paper, we discuss a model of two-space food chain consisting of the population of ecology of foxes (the predator) and rabbits (prey) in Awash National park, Ethiopia. The study is based on formulation of a mathematical model to study the dynamics of the population densities and analyzing the stability of equilibrium points of the prey-predator model. The aim of this model is to explore the behavior of a simple model by considering a population of foxes, and rabbits. This model is constituted by a system of nonlinear decoupled ordinary differential equations. By using perturbed method, we identify the nature of the system at each equilibrium point. The stability analysis of a prey-predator model is discussed with numerical simulations.

Performance Analysis of Improved Self Cancellation Technique for Wavelet Based OFDM Through Simulink Model

Abstract: As per the most recent literature, Orthogonal Frequency Division Multiplexing (OFDM), a multi access technique, is considered most suitable for the 3G, 4G and 5G techniques in high speed wireless communication. What made OFDM most popular is its ability to deliver high bandwidth efficiency and superior data rate. Besides it, high value of peak to average power ratio (PAPR) and Inter Carrier Interference (ICI) are the challenges to tackle down via appropriate mitigation scheme. As a research contribution in the present work, an improved self-cancellation (SC) technique is designed and simulated through Simulink to mitigate the effect of ICI. This novel proposed technique (Improved SC) is designed over discrete wavelet transform (DWT) based OFDM and compared with conventional SC scheme over different channel conditions i.e. AWGN and Rayleigh fading environments. It is found that proposed DWT-OFDM with Improved SC scheme outperforms conventional SC technique significantly, under both AWGN and Rayleigh channel conditions. Further, in order to justify the novelty in the research contribution, a Split-DWT based Simulink model for Improved SC scheme is investigated to analyse the BER performance. This Split-DWT based Simulink model presented here foretells the future research potential in wavelet hybridization of OFDM to side-line ICI effects more efficiently.

Cytotoxicity and Antioxidant Potentials ofBarringtonia Asiatica Essential Oil

Abstract: Essential oils are liquid mixture of volatile compound obtained from aromatic plants. It was observed that many essential oils have antioxidant properties and can present antimicrobial activities.

Cross-pathogenicity of Colletotrichum isolates on tropical fruit species in Brazil

Abstract: Due to their perishable nature, tropical fruits are prone to pre-and post-harvest loss attributed to biotic and abiotic factors. Although the production of tropical fruits such as banana (Musa acum...