http://dspace-su.server.ly:8080/xmlui/handle/123456789/675 Sun, 03 May 2026 11:55:25 GMT 2026-05-03T11:55:25Z http://dspace.lslab.ly:80/bitstream/id/9763e503-6778-424a-8567-49d37a748cc1/ http://dspace-su.server.ly:8080/xmlui/handle/123456789/675 http://dspace-su.server.ly:8080/xmlui/handle/123456789/703 Design and Implementation of an Innovative Balun Configuration for Planar Antenna Use Younus Mohammed The main parts of balanced circuits, including push-pull amplifiers, balanced mixers, frequency multipliers, and antennas, are baluns. Due to the increased integration of most of these applications, baluns must be inexpensive and of small size. This research paper presents a novel method for designing planar baluns. The approach begins by examining a symmetrical 4-port network features an open-circuit termination on one port, utilizing both even and odd mode stimulations. The suggested balun, supported by comprehensive design equations, showcases a completely balanced output and excellent input alignment, with measurement outcomes aligning closely with the simulated values. Mon, 01 Apr 2024 00:00:00 GMT http://dspace-su.server.ly:8080/xmlui/handle/123456789/703 2024-04-01T00:00:00Z http://dspace-su.server.ly:8080/xmlui/handle/123456789/700 A Comparative Study of Field Oriented and Backstepping Control Strategies for Wind turbine PM Synchronous Generator Mohammed Khatab; Aiman Nouh; Ali. S. Abd-Alraheem In this paper, a comparative study of Field Oriented Control and Backstepping Control methods has been conducted to control a Permanent Magnet Synchronous Generator for wind power application. These control strategies are described and designed, then implemented using the Matlab/Simulink environment. Finally, the two different strategies are compared in response to active power, current, voltage, electromagnetic torque, and rotor speed. FOC allows us to independently control the torque and the flux of our machine in the same way as a DC machine with separate excitation, where the inducing current controls the magnetic flux, and the induced current controls the electromagnetic torque. We transformed the stator instantaneous currents to two current components, one which controls the flux (along the d axis), and the other controls the torque (along the q axis). The adaptive Backstepping control relies on the nonlinear model of the controlled system. It harnesses the principles of the Lyapunov stability theory to regulate various parameters and uphold the overall system’s stability. The findings of this research showed that firstly, backstipping control method is faster, less ripple, and more stable than the FOC method. Secondly, the THD in FOC method is higher than in backstipping control method. Finally, both control techniques have sinusoidal current and voltage waveforms. So, they can satisfy the grid code. Mon, 01 Apr 2024 00:00:00 GMT http://dspace-su.server.ly:8080/xmlui/handle/123456789/700 2024-04-01T00:00:00Z http://dspace-su.server.ly:8080/xmlui/handle/123456789/697 Performance Analysis of Awbari Gas Turbine Power Plant with Crude Oil Mahdi Algool; Salih Alsadaie The performance of a gas turbine can be evaluated by its efficiency and net power output which both are affected by ambient conditions (atmosphere air temperature and humidity) and used fuel.In this work, the performance of the gas turbine (SGT5-2000E) has been modelled using HYSES ASPEN software and evaluated by assessing the efficiency, net power, specific fuel consumption (SFC), and fuel-air-ratio (FAR) in a hot weather region at sea level (the Sahara Desert in Libya ). Evaluation of the performance of SGT5-2000E (Awbari gas turbine power plant, south of Libya) has been carried out by modelling the units of the power plant using HYSYS ASPEN and validated against the design data provided by the manufacturer. In addition, two performance scenarios (two different fuels) were drawn for the gas turbine power plant. The first is at a fixed Pressure Ratio (PR) of 12 with a variation of the compressor inlet temperature (CIT)between 0 oC and 50 oC, and the second is at a fixed CIT of 15 oC with a variation of PR ranging from 7 to14 bar. Additionally, a performance analysis of the Awbari power plant is performed based on CIT and PR. The results show that the CIThas a linear effect on the turbine’s efficiency, while the PR has a non-linear effect on the turbine's efficiency. The effect of PR on the net power at fixed CIT has different behaviour depending on its CIT. For different CIT values, the net power reaches the peak at the PR values between 9 and 12. Moreover, using Natural gas as fuel for gas turbine units promotes proper turbine performance compared with crude oil as fuel. Mon, 01 Apr 2024 00:00:00 GMT http://dspace-su.server.ly:8080/xmlui/handle/123456789/697 2024-04-01T00:00:00Z http://dspace-su.server.ly:8080/xmlui/handle/123456789/694 The effect of austenitizing temperature on thenormalising processing behaviour of 34CrNiMo6 steel Nasar Abdlssalam Ali; Mahdi Algool The aim of this study is to carry out research about the effect of austenitizing temperature of 34CrNiMo6 low alloy steel on the normalising heat treatment process. Moreover, a comparison of the austenite grain size that formed after the deformation at two austenitizing temperatures of 1100°C and 1200°C with that one resulted after the normalising process at temperature of 860°C. Moreover, to study the effects of increases of holding times of 6, 30 and 60 minutes at normalising process with both austenitizingon the grain size variation, and the consistency of microstructure, which in turn influences on the resulted mechanical properties. It was observed that deformation the specimens at austenitizing temperature of 1100 °C prior normalising process; gives a smaller grain sizes than those when using austenitizing temperature of 1200 °C. Furthermore, Increase in the normalising soaking times does have no influence the increasing of the grain size of austenite. However, it has an effect on The arrangement and shape of grains by making the grains equiaxed and creates a uniform structure. Furthermore, oxides scale thickness was observed at austenitizing temperature of 1200 °C, and particularly when soaking time at that temperature increased Mon, 01 Apr 2024 00:00:00 GMT http://dspace-su.server.ly:8080/xmlui/handle/123456789/694 2024-04-01T00:00:00Z