Cilt 5, Sayı 1, Makale Koleksiyonu
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Öğe A study On the Zn(II) separation efficiency of chemically synthesized hydroxyapatite (HAp) particles(Aksaray Üniversitesi, 2021) Dizle, Ahmet; Uysal, YağmurIn this study, hydroxyapatite particles (HAp) were chemically synthesized by using coprecipitation method to determine their capabilities on the sorption of Zn(II) ions from aqueous solutions. HAp particles were chosen because of their low cost for production, high stability, easy to use, and effective sorption power. In order to determine the operation conditions of the adsorption system to be installed when this adsorbent is desired to be used in field applications, parameters such as system pH, initial Zn(II) concentration and adsorbent concentrations have been optimized. Properties and functional structure of the adsorbent materials were characterized by using SEM, FTIR, and EDX analyzes. The kinetic behavior of Zn(II) adsorption with HAp was consistent with the pseudo second order kinetic model. Additionally, the equilibrium states of the adsorption processes were studied by using Langmuir, Freundlich, Temkin, Scatchard and Dubinin–Radushkevich (D-R) isotherm models. The maximum sorption capacity HAp was obtained as 500 mg/g, and best removal value of 91% were determined at pH of 6.0, optimum adsorbent concentration of 3.75 g/L, in 25 mg/L Zn(II) concentration and optimum mixing time of 45 min. This study showed that the HAp can be considered an effective adsorbent on the Zn(II) removal from wastewater.Öğe Efficiency analysis for triple band RF energy harvesting(Aksaray Üniversitesi, 2021) Yalçın, Aziz Burak; Sarı, FilizIn this paper, a multi-band RF energy harvesting circuit is designed. The output voltage and power of the system built at 900 MHz, 1800 MHz and 2450 MHz frequencies are revealed. All simulations in this paper are made using the Advance Design System (ADS) 2017 program. The load resistances that give the maximum power for each frequency are determined and the appropriate load is selected for all three frequencies. Then, the multi-stage Dickson Voltage Multiplier (DVM) from two to six stages is designed and the number of stages giving the maximum power for each frequency is determined using the selected load. L type and ? type impedance matching have been applied to obtain the maximum output power in DVM design, which includes this number of stages and has two Schottky diode models (HSMS-2852). Finally, these three circuits are combined and the output voltage and efficiency of the resulting system are analyzed.Öğe Assessment and development of path loss propagation model for Ikire metropolis, Nigeria(Aksaray Üniversitesi, 2021) Popoola, Jide J.The aim of this paper is to assess and develop path loss propagation model for terrestial radio broadcasting station in Ikire, Nigeria. In carrying out the study, the reception quality of Osun State Corporation (OSBC) broadcast signal strength within Ikire metropolis in Irewole Local Government Area of Osun State, Nigeria was assessed using BC1173 Field Strength meter. The data obtained from the signal strength measurements around the metropolis were subsequently analysed and used for the development of an ideal propagation path loss model for the metropolis. The developed path loss model for the metropolis was evaluated and found to outperform the COST-231 Hata model in literature. The comparative performance evaluation result of the developed model and the COST-231 Hata model buttresses the need for developing different path loss models for different radio signals in different locations under different environmental factors. In addition, the finding of the study establishes a standard propagation path loss model that can be used for planning and designing efficient wireless communication link for terrestrial radio broadcasting station in the metropolis and any other environments with similar environmental factors.Öğe Speed control of DC motor under reverse torque disturbance with ant colony optimized PID controller(Aksaray Üniversitesi, 2021) Kasım, ÖmerDirect Current (DC) motors are widely used in industrial systems due to their high torque. In ensuring the stability and productivity of a system, it is important that the DC motor within the automation system reaches the reference speed value quickly and its speed remains constant under load. In this study, it is aimed to keep the speed value of DC motor constant under load by optimizing the gain parameters of the Proportional, Integral and Derivative (PID) controller, which is widely used in industrial applications. In the optimization of these parameters, the Ziegler Nichols method (ZNM) and the Ant Colony Optimization method (ACO) were examined comparatively in the simulation environment. PID parameters were determined by open loop responses under the running system with the ZNM. On the other hand, the most optimum solution was obtained among many parameters with the ACO method. Speed control of DC motor was performed with PID controller parameters which are determined according to the best ACO response. Simulation results are presented in comparison with the parameters of settling time, peak time, rising time and response of the system under load. As a result, PID controller run with Kp, Ki, and Kd parameters obtained by ACO algorithm generally gave better results than ZNM.Öğe Proportional counter in X-ray fluorescence(Aksaray Üniversitesi, 2021) Qadr, Hiwa MohammadThe purpose of this work is to investigate and quantify x-ray fluorescence, its production and its spectroscopy. Characteristic x-ray with different energies was obtained from six various elements using Am-241 source with 59.5 keV. It was found that x-ray energy and intensity increase with increasing atomic number of material. X-ray spectroscopy was studied for such elements in respect to their atomic number and intensity of K? using proportional counter. Furthermore, x-ray fluorescence was produced from different thicknesses of copper foil using different energies. It was found that there is no substantial difference in x-ray fluorescence yield with higher thickness of the target.
