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.

Experimental Investigation of Enzyme Stabilization and Its Effect on Clay Brick

Abstract: In this paper, compressive strength, water absorption, diffusivity capacity, pore area, and the role of the enzyme on clay soil brick were verified. The higher compressive strength at enzym...

Investigating Elementary School Mathematics Teachers’ Knowledge of Students about some Numbers

Abstract: The study investigated the competence of elementary mathematics teachers’ knowledge of students about some numbers. Studies have shown that there are common misconceptions that students exhibit in dealing with numbers. This study wanted to determine how competent elementary teachers are in identifying and dealing with such students’ misconceptions. A sample of 30 teachers was randomly selected as participants in this study. The instrument for data collection was questionnaire designed for teachers to respond to through detail explanations in writing. Participants were presented with the problem situations and were expected to respond to the questions or tasks. The problem situations were a given problem and the hypothetical students’ solutions of the given problem. The study revealed that while some teachers were competent in addressing students’ misconceptions in the topic area, others had difficulties themselves in understanding the problem situations and the hypothetical students’ solutions.

SEIRS model with spatial correlation for analyzing dynamic of virus spreading in event-driven wireless sensor networks

Abstract: In Event-driven wireless systems, mostly data transmission depends on events occurring in the sensor field. Most of the time, sensor nodes are silent or in sleep mode. When events occur in the sensor field, a single event can trigger many nodes for data transmission. In such a scenario, the nodes collect the correlated information due to the overlapped coverage area. Existing epidemiological designs do not consider the nodes’ behavior to investigate infection dynamics for this scenario. In this paper, a susceptible-exposed-infectious-recovered- susceptible (SEIRS) is designed by considering the spatial correlation for analyzing the dynamics of the virus spreading in event-driven wireless systems. Firstly, we show how strongly correlated nodes and less correlated nodes are formed in a WSN based on sensor coverage. The differential equations of SEIRS are then derived. An analysis on system stability is performed for finding the basic reproduction number $$R_0$$ . The value of $$R_0$$ gives important significance in terms of spatial correlation for analyzing virus spreading. Experiments are performed to validate the model using various parameters such as correlation, node density, the basic reproduction number. Comparisons with existing models show the effectiveness of the SEIRS model. Based on the analysis, it is observed that the virus spread control can be possible by reducing $$R_0$$ . It is also found that the threshold of virus propagation is strongly dependent on the spatial correlation between nodes in the network. The virus is the network persists at virus-free equilibrium when $$R_0 > 1$$ with higher spatial correlation, whereas it becomes globally stable for $$R_0 < 1$$ .

Security Funding, Accountability and Internal Security Management in Nigeria

Abstract: The thesis view of the study is that although more resources have been allocated for security in Nigeria, Tthe country has not attained security commensurate to funds disbursed . This is due largely to lack of transparency and accountability in the process of disbursement and utilisation of security funds in Nigeria. The chapter ends with a recommendation that the channels of disbursement and utilisation of security funds in Nigeria be reviewed and transparency and accountability be incorporated into it for effective utilisation.

Modeling and Control of Electro-Hydraulic Actuator

Abstract: Modeling and position control of an Electro-Hydraulic Actuator (EHA) system is investigated in this paper. Linear ARX EHA system model is identified by taking the experimental data using system identification toolbox in the MATLAB/Simulink. From the identified models the best fit ARX 331 model is used to design a controller using fuzzy logic and Particle swarm optimization (PSO) methods. In the self-tuning Fuzzy PID controller, the controller parameters KP, KI, and KD are tuned by the fuzzy controller depending on the two inputs: error and derivatives of the error. In the PSO optimized PID controller, the sum of the time-weighted absolute error objective function is minimized and optimized controller parameters are tuned using PSO algorithms. The results are simulated in the MATLAB/Simulink and compared among conventional Ziegler-Nichols (Z-N), Fuzzy, and PSO PIDs. The results indicate that the self-tuning fuzzy PID and PSO optimized PID give better performance than the Z-N PID controller and the PSO-optimized PID controller demonstrates superior performance in terms of percentage overshot and speed of response with 5% overshoot, 0.02 s rise time and 0.15 s settling time.