Marwa M. Ahmed

ORCID: 0000-0003-4197-5907
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About
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Research Areas
  • Photovoltaic System Optimization Techniques
  • Advanced Battery Technologies Research
  • Wireless Power Transfer Systems
  • solar cell performance optimization
  • Solar Radiation and Photovoltaics
  • Microgrid Control and Optimization
  • Mathematical Inequalities and Applications
  • Wind Turbine Control Systems
  • Power Systems and Renewable Energy
  • Electric Motor Design and Analysis
  • Power System Reliability and Maintenance
  • Mathematics and Applications
  • Nonlinear Differential Equations Analysis
  • Advanced Sensor and Energy Harvesting Materials
  • Multilevel Inverters and Converters
  • Electric and Hybrid Vehicle Technologies
  • Plant responses to elevated CO2
  • Plant Parasitism and Resistance
  • Postharvest Quality and Shelf Life Management
  • Advanced Algorithms and Applications
  • Algal biology and biofuel production
  • Energy Harvesting in Wireless Networks
  • Functional Equations Stability Results
  • Electrical Contact Performance and Analysis
  • Animal Virus Infections Studies

King Abdulaziz University
2020-2024

This article proposes an Artificial Neural Network (ANN) controller of Dynamic Voltage Restorer (DVR) to improve the performance a stand-alone hybrid renewable energy system that is feeding new community located in Egypt. The consists three sources, namely, solar PV cells, wind turbines based-permanent magnet synchronous generator, and fuel cells. These sources are tied common DC link by boost converters, one for each source. connected AC side via DC/AC inverter. optimal size proposed...

10.1016/j.aej.2020.03.037 article EN cc-by-nc-nd Alexandria Engineering Journal 2020-06-01

The wireless power transfer (WPT) system holds potential as a viable solution for charging electric vehicles (EVs) owing to its benefits including safety, automated operation, efficiency, and simplicity. Among the WPT technologies, inductive (IPT) stands out particularly well-suited EV batteries. This is primarily due capability transmit high across considerable air gap distances, accommodating ground clearance requirements of most EVs, operating automatically without driver involvement,...

10.1109/access.2024.3402553 article EN cc-by IEEE Access 2024-01-01

Viruses are the most abundant living things and a source of genetic variation. Despite recent research, we know little about their biodiversity geographic distribution. We used different bioinformatics tools, MG-RAST, genome detective web GenomeVx, to describe first metagenomic examination haloviruses in Wadi Al-Natrun. The discovered viromes had remarkably taxonomic compositions. Most sequences were derived from double-stranded DNA viruses, especially Myoviridae, Podoviridae, Siphoviridae,...

10.3390/genes14020323 article EN Genes 2023-01-26

The inductive charging stations of the future should be able to charge any car, regardless type coil configuration attached it. In this study performance different configurations coils is investigated. Where principle interoperability studied between most common types in IPT system (rectangular and double-D) recommended by Society Automotive Engineering (SAE) J2954. This analysis done at a power level 11.1 kVA Z3-class ground clearance using two on side while double D (DD) used as general...

10.1016/j.aej.2023.07.064 article EN cc-by-nc-nd Alexandria Engineering Journal 2023-08-03

The Doubly Fed Induction Generator based Wind Turbine (WT-DFIG) suffers from instability while steady-state operation if improperly controlled. This paper proposes and evaluates three Scalar strategies that ensure Maximum Power Point Tracking (MPPT) stabilize the WT-DFIG. Both of generator electromagnetic torque – speed wind turbine mechanical torque-speed characteristics are taken into account. DFIG stabilized MPPT characteristic is first examined evaluated in conjunction with ratio stator...

10.1016/j.aej.2020.09.043 article EN cc-by Alexandria Engineering Journal 2020-10-09

Real-time estimation of transmission line (TL) parameters is essential for proper management and distribution networks. These can be used to detect incipient faults within the hence avoid any potential consequences. While some attempts found in literature estimate TL parameters, presented techniques are either complex or impractical. Moreover, none published so far implemented real time. This paper presents a cost-effective technique The proposed employs easily accessible voltage current...

10.3390/en14113239 article EN cc-by Energies 2021-06-01

This paper presents novel models of Soft Computing (SC) Maximum Power Point Tracking (MPPT) controllers for Photo-Voltaic Water Pumping Systems(PVWPS) Based on DC Motor. Also discusses and evaluates the performance proposed models. The methodology is mainly based duty cycle prediction cuk converter to track maximum power point (MPP) PV array. Indeed water flow rate PVWPS at varying climate conditions must ensure that motor-pump set operates MPP. analytical modeling MPPT controller has been...

10.1016/j.egyr.2021.09.055 article EN cc-by-nc-nd Energy Reports 2021-09-24

This work presents a novel methodology for variable speed high power Transfer Capability of self-excited induction generator (SEIG). The proposed is based on the selection suitable firing angle Fixed Capacitor-Thyristor Controlled Reactor (FC-TCR) achieving constant rated stator current. WDSEIG would produce without overheating under wind and connected load. analytical approach has been implemented to predict optimal operating FC-TCR full load current achievement within allowed range prime...

10.1109/access.2020.2968976 article EN cc-by IEEE Access 2020-01-01

<abstract><p>In this article, the Montgomery identity and Ostrowski inequality are established for univariate first-order diamond-alpha differentiable functions. We also investigate generalization of Ostrowski-type inequalities bivariate functions with bounded second-order derivatives by applying integration parts $ \diamondsuit_\alpha $-integrals. Moreover, some extensions dynamic trapezoid- Grüss-type obtained using identity.</p></abstract>

10.3934/math.2024624 article EN cc-by AIMS Mathematics 2024-01-01

Worldwide energy demand is growing fast because of the population explosion. Technological advancements paved way toward utilizing renewable sources instead fossil fuels as they cause harmful effects on environment. To increase efficiency a solar PV system, Maximum Power Point Tracking (MPPT) techniques are applied to power converter that connected array. Thus, maximum extracted from Since sunlight not always available, battery used storage device. Traditionally, two two-port converters with...

10.1109/aceee56193.2022.9851872 article EN 2022-07-08

Worldwide energy demand is growing fast because of the population explosion. Technological advancement paved way toward utilizing renewable sources instead fossil fuels as they cause harmful effects on environment. Among all sources, solar a promising source. Solar captured by photovoltaic (PV) arrays that convert sunlight into electricity powers load. A vital component in PV system DC-DC converter. Maximum Power Point Tracking (MPPT) techniques can be applied to converter deliver maximum...

10.1109/cgee55282.2022.9976563 article EN 2022-08-28

In this study the performance of different configurations coils is investigated. Where principle interoperability studied between most common types in IPT system(rectangular and double-D)recommended by Society Automotive Engineering (SAE) J2954. This analysis done at a power level 11.1kVA Z3-class ground clearance using two on side car, while double D (DD) used as general transmitter one case, other rectangle (R)is transmitter. Four 3D finite-element models (FEMs), along with compensation...

10.2139/ssrn.4395309 article EN SSRN Electronic Journal 2023-01-01

<abstract><p>In the current manuscript, new alpha delta dynamic Hardy-Hilbert inequalities on time scales are discussed. These combine and expand a number of continuous their corresponding discrete analogues in literature. We shall illustrate our results using Hölder's inequality few algebraic inequalities.</p></abstract>

10.3934/math.20231126 article EN cc-by AIMS Mathematics 2023-01-01
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