Browsing by Author "n 2014186122"
Now showing items 61-80 of 167
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Bismuth perovskite as a viable alternative to Pb perovskite solar cells: device simulations to delineate critical efficiency dynamics
Pham M.; Harris J.; Shaffer J.; Daniel A.; Chowdhury S.; Ali A.; Banerjee S.; Ahmed S.... more authors ... less authors ( Springer New York LLC , 2019 , Article)We have simulated the operation and functionality of a working Bi-based perovskite solar cell device using GPVDM and compared it against a Pb-based device. The results are extremely promising in that they showcase comparable ... -
Brushless doubly fed induction machine as a variable frequency transformer
Abdel-Khalik, A. S.; Elserougi, A.; Ahmed, S.; Massoud, Ahmed ( IEEE , 2012 , Conference Paper)Variable frequency transformer (VFT) has been recently used as an alternative to HVDC to control power flow between asynchronous networks. VFT consumes less reactive power than a back-to-back HVDC system, provides faster ... -
Calculation of derating factors based on steady-state unbalanced multiphase induction machine model under open phase(s) and optimal winding currents
Abdel-Khalik, A. S.; Masoud, M. I.; Ahmed, S.; Massoud, Ahmed ( Elsevier , 2014 , Article)Multiphase machines have become a promising candidate in high-power applications as they offer many advantages over their three-phase counterparts. The main salient feature is the high fault tolerance capability. During ... -
Carrier-Based PWM Strategy for Quasi-Z Source Nine-Switch Inverters
Dabour, S.M.; Abdel-Khalik, A.S.; Ahmed, S.; Massoud, Ahmed ( Institute of Electrical and Electronics Engineers Inc. , 2019 , Conference Paper)Nine-switch Inverters (NSIs) have been proposed to accommodate the independent control of dual AC motors or in six-phase drives. This topology reduces the number of active switches by 25% compared with conventional Voltage ... -
Cogging torque reduction of axial magnetic gearbox using pole pairing technique
Zaytoon, H.; Abdel-Khalik, A.S.; Ahmed, S.; Massoud, Ahmed ( Institute of Electrical and Electronics Engineers Inc. , 2015 , Conference Paper)Magnetic gearbox (MGB) becomes an attractive research topic in mechanical transmission as it offers significant advantages over mechanical gears such as contactless power transfer, high gear ratios, inherent overload ... -
Common-mode voltage reduction for space vector modulated three- to five-phase indirect matrix converter
Dabour S.M.; Abdel-Khalik A.S.; Ahmed S.; Massoud A.M.; Allam S.M. ( Elsevier Ltd , 2018 , Article)All available Pulse Width Modulation (PWM) techniques employed to different Matrix Converter (MC) topologies generally generate switching Common-Mode Voltage (CMV), which introduces numerous operational concerns in electric ... -
Comparative evaluation of four quasi-square wave fed multiphase induction machines
Abdel-Khalik, A.; Ahmed, S.; Massoud, Ahmed ( IEEE , 2011 , Conference Paper)Multiphase winding structures provide induction machines with favorable fault tolerant characteristics. Medium voltage drives have also benefited from the favorable application characteristics of multiphase machines, as ... -
Conceptual study of AC-powered switched non-polarized-capacitors based solid-state bipolar Marx pulse generator
Elserougi, A.A.; Shafik, Z.; Massoud, Ahmed; Ahmed, S. ( Institute of Electrical and Electronics Engineers Inc. , 2017 , Article)The conventional unipolar Marx generator can be employed for bipolar pulsed electric field by adding a high-voltage H-bridge at the load side which necessitates stacked switches. Alternatively, bipolar Marx generator with ... -
Control of doubly-fed induction machine storage system for constant charging/discharging grid power using artificial neural network
Abdel-Khalik, A.S.; Elserougi, A.; Massoud, Ahmed; Ahmed, S. ( IET , 2012 , Conference Paper)A large-capacity low-speed flywheel energy storage system based on a doubly-fed induction machine (DFIM) basically consists of a wound-rotor induction machine, and a back-to-back converter for rotor excitation. It has been ... -
DC bus control of an advanced flywheel energy storage kinetic traction system for electrified railway industry
Daoud, Mohamed I.; Abdel-Khalik, A. S.; Elserougi, A.; Ahmed, S.; Massoud, Ahmed ( IEEE , 2013 , Conference Paper)The evolution of public transportation exhibits high potential nowadays due to the consistent demand of clean transportation with low pollution rates. Therefore electrified railway systems become viable with their ... -
A design example of an 8-pole radial AMB for flywheel energy storage
Daoud, Mohamed I.; Abdel-Khalik, A. S.; Massoud, A.; Ahmed, S.; Abbasy, Nabil H. ( IEEE , 2012 , Conference Paper)High speed flywheel energy storage systems normally use magnetic bearings to reduce friction loss. Bearing load consists of radial forces with or without axial forces according to drive configuration and requirements. The ... -
Diagnostic value of bronchoalveolar lavage in the subset of patients with negative sputum/smear and mycobacterial culture and a suspicion of pulmonary tuberculosis
Ahmad M.; Ibrahim W.H.; Sarafandi S.A.; Shahzada K.S.; Ahmed S.; Haq I.U.; Raza T.; Hameed M.A.; Thomas M.; Swehli H.A.I.; Sattar H.A.... more authors ... less authors ( Elsevier B.V. , 2019 , Article)Background: The diagnostic value of bronchoalveolar lavage in patients with negative sputum/smear for tuberculous bacilli has been well studied. However, its value in the subset of patients with both negative sputum/smear ... -
Discrete time domain analysis and optimal design of stationary frame AC current controllers with active damped LCL Filter for high power applications
El-Deeb, H.M.; Elserougi, A.; Abdel-Khalik, A.S.; Ahmed, S.; Massoud, Ahmed ( IEEE Computer Society , 2014 , Conference Paper)Due to the large variety of renewable power sources, power electronics play an important role in energy conversion. Different power converter topologies are used to interface distributed power generation systems (DPGS) ... -
Editorial : Optimal Satellite Sensor Selection Utilized to Monitor the Impact of Urban Sprawl on the Thermal Environment in Doha City, Qatar
Al Kuwari, NY; Ahmed, S.; Kaiser, MF ( OMICS International , 2016 , Article)In the present study, the most appropriate Landsat and ASTER Image spatial and spectral resolutions were selected to extract thermal infrared data in Doha City, Qatar from 1990-2015. Results indicated Urban Heat Island(UHI) ... -
Effect of current harmonic injection on constant rotor volume multiphase induction machine stators: A comparative study
Abdel-Khalik, A. S.; Masoud, M. I.; Ahmed, S.; Massoud, Ahmed ( IEEE , 2012 , Article)Although torque enhancement in multiphase induction machines using harmonic current injection has been addressed in the literature, a detailed assessment of the effect of this enhancement on the design parameters of ... -
Effect of DC-Link Voltage Limitation on Postfault Steady-State Performance of Asymmetrical Six-Phase Induction Machines
Abdel-Khalik A.S.; Massoud A.M.; Ahmed S. ( Institute of Electrical and Electronics Engineers Inc. , 2018 , Article)The asymmetrical six-phase induction machine represents the most common multiphase machine type used in many high-power industrial applications. While a body of research covering control of the machine under fault conditions ... -
Effect of stator winding connection of five-phase induction machines on torque ripples under open line condition
Abdel-Khalik, A.S.; Ahmed, S.; Elserougi, A.A.; Massoud, Ahmed ( Institute of Electrical and Electronics Engineers Inc. , 2015 , Article)One of the main challenges in designing high-power drive systems is the quality of the developed torque. High-torque-ripple magnitudes result in serious vibration and acoustic noise problems that affect the lifetime of a ... -
Elimination of reverse recovery effects associated with CoolMOS devices employing current source inverter topology
Farag, M. M.; Gadoue, S. M.; Mohamadein, A.L.; Massoud, Ahmed; Ahmed, S. ( IET , 2012 , Conference Paper)MOSFET transistors are continuously being an essential part of power electronic converters due to their low switching losses at high switching frequencies. However, the traditional power MOSFET suffers from a relatively ... -
Energy in smart grid: Strategies and technologies for efficiency enhancement
Elgenedy, M.A.; Massoud, Ahmed; Ahmed, S. ( Institute of Electrical and Electronics Engineers Inc. , 2015 , Conference Paper)Incorporating advanced software and hardware technologies, to create a two way electricity and information flow, is forming the concept of the smart grid (SG). In an SG the energy delivery and control not only autonomous ... -
Enhancement of the extracted maximum power of PV array during partial shading using switched PV-based system
Elserougi, A.; Diab ,M. S.; Abdel-Khalik, A.; Massoud, Ahmed; Ahmed, S. ( Institute of Electrical and Electronics Engineers Inc. , 2015 , Conference Paper)This paper proposes a switched PV approach to enhance the extracted maximum power from PV array during partial shading condition. The proposed system is simple and cost effective. However, it may provide lower power ...