Amr Radwan, Yasser Abdel‐Rady I. Mohamed,
This paper addresses power management and control strategies of a hybrid microgrid system that comprises ac and dc subgrids. Each subgrid consists of multiple distributed generation (DG) units and local loads. Both entities are interconnected by voltage source converters (VSCs) to facilitate a bidirectional power flow and increase the system reliability. The control of the interconnecting VSC can be achieved autonomously. However, it is shown that the autonomously controlled hybrid microgrid fails ...
Tópico(s): Smart Grid Energy Management
2014 - Institute of Electrical and Electronics Engineers | IEEE Systems Journal
Amr Radwan, Yasser Abdel‐Rady I. Mohamed,
Driven by the economical and environmental concerns, the importance of distributed generation-based microgrids is increasing. However, the presence of induction motor (IM) loads in converter-based microgrids might induce source-load admittance mismatch between the IM load and microgrid converters leading to medium-frequency instabilities, particularly in isolated microgrids. To overcome this issue, this paper presents detailed small-signal admittance models, analysis, and stabilization of a voltage- ...
Tópico(s): Optimal Power Flow Distribution
2013 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Smart Grid
Amr Radwan, Yasser Abdel‐Rady I. Mohamed,
This paper addresses the stability analysis and active-impedance-based stabilization of pulsewidth modulated voltage-source rectifier (VSR) loads in grid-connected and isolated voltage-source inverter (VSI)-based microgrid systems. Using small-signal analysis, detailed and coupled admittance-based models of the VSR-interfaced load and the source side are obtained in the rotating reference frame by considering all control loops and phase-locked loop dynamics. Therefore, a multi-input-multi-output (MIMO) ...
Tópico(s): Power Systems and Renewable Energy
2013 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Sustainable Energy
Amr Radwan, Yasser Abdel‐Rady I. Mohamed,
Current source converters (CSCs) can be a viable option to interface large photovoltaic (PV) systems to the utility grid. However, interaction dynamics in both the ac- and dc-sides might be yielded and affect the converter stability. 1) On the ac side, interactions of the grid impedance with the LC ac-side filter might cause uncertain resonant frequency modes that should be damped without affecting the converter efficiency. 2) On the dc-side, under uncertain characteristics of the PV source impedance ( ...
Tópico(s): HVDC Systems and Fault Protection
2013 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Sustainable Energy
Rania Nagi Abd‐Ellatif, Nahla Anas Nasef, Hemat El‐Sayed El‐Horany, Marwa N. Emam, Reham L. Younis, Rehab E. Abo El Gheit, Walaa S. Elseady, Doaa A. Radwan, Yasser Mostafa Hafez, Ahmad Eissa, Alshimaa Aboalsoud, Rania H. Shalaby, Marwa Mohamed Atef,
Doxorubicin (DOX) is an anticancer antibiotic which has various effects in human cancers. It is one of the commonly known causes of drug-induced nephrotoxicity, which results in acute renal injury. Adrenomedullin (ADM), a vasodilator peptide, is widely distributed in many tissues and has potent protective effects. Therefore, the current study aimed to examine the protective potential mechanisms of ADM against DOX-induced nephrotoxicity. A total of 28 male Wistar rats were randomized into four groups: ...
Tópico(s): Ion Channels and Receptors
2022 - Multidisciplinary Digital Publishing Institute | International Journal of Molecular Sciences
Mohammad Adnan K. Magableh, Amr Radwan, Yasser Abdel‐Rady I. Mohamed,
Single-stage utility-scale photovoltaic (PV) systems are usually interfaced with the host grid via a centralized voltage-source converter (VSC). Recently, and due to their reliability, the dc-link film capacitors are favored over electrolytic types in grid-connected applications. However, the capacitance per unit volume of film capacitors is significantly smaller than electrolytic capacitors. The overall system stability might be compromised by the reduction of the dc-link capacitance, particularly ...
Tópico(s): Islanding Detection in Power Systems
2021 - Institute of Electrical and Electronics Engineers | IEEE Access
Amr Radwan, Yasser Abdel‐Rady I. Mohamed,
This paper introduces a new topology, yet simple and efficient, for a grid-connected wind-solar cogeneration system. A permanent magnet synchronous generator-based full-scale wind turbine is interconnected to the utility-grid via back-to-back voltage-source converters (VSCs). The dc-link capacitor has been utilized to directly interface a photovoltaic solar generator. No dc/dc conversion stages are required, and hence, the hybrid system is simple and efficient. Moreover, the proposed topology features ...
Tópico(s): Hybrid Renewable Energy Systems
2019 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Sustainable Energy
Saad H. Alotaibi, Ahmed S. Radwan, Yasser K. Abdel‐Monem, M.M. Makhlouf,
In the present paper, a novel dye of 4-methyl-5-(4-acetylphenyldiazenyl)thiazol-2-amine (L) and its corresponding copper complexes are synthesized and characterized using different techniques including elemental analysis, thermal analysis, 1H NMR, Mass, and FT-IR spectra. The thermal behavior of L and its complexes is carried out and discussed using thermogravimetric analysis, and it observed that the type of copper substituent affects the thermal decomposition of complexes. Homogenous thin films ...
Tópico(s): Photochromic and Fluorescence Chemistry
2018 - Elsevier BV | Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy
Amr Radwan, Yasser Abdel‐Rady I. Mohamed,
Current-source converters (CSCs) have a promising potential to interface the large-scale photovoltaic (PV) generators to electric grids. In order to overcome several drawbacks associated with the conventional vector-controlled CSC-based PV systems, this paper presents for the first time, the power synchronization control (PSC) scheme for the single-stage grid-connected CSC-based PV generator. A detailed small-signal model for the complete CSC-based PV system with the PSC strategy is developed to investigate ...
Tópico(s): Power Systems and Renewable Energy
2016 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Energy Conversion
Amr Radwan, Yasser Abdel‐Rady I. Mohamed,
This paper investigates the interconnection of current-source converters (CSCs) to a very weak grid using the conventional vector control in the rotating reference frame. It is shown that the system stability is degraded under weak-grid conditions due to the implementation of the synchronous reference frame phase-locked loop (PLL). Supplementary controllers are proposed and integrated to the outermost control loops of the CSC to alleviate the associated negative impacts of the PLL. The proposed compensators ...
Tópico(s): HVDC Systems and Fault Protection
2015 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Power Systems
Amr Radwan, Yasser Abdel‐Rady I. Mohamed,
Hybrid ac/dc power networks are recently emerged in distribution generation (DG) systems with widespread acceptance under the smart grids environment. However, system-level dynamic interactions might be yielded due to the active control nature and tight regulation of power converters to meet load/generation requirements. This paper presents an assessment and mitigation strategies of such interactions in hybrid networks. A typical and comprehensive hybrid network composed of a DG power park, dc microgrid, ...
Tópico(s): Optimal Power Flow Distribution
2012 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Smart Grid
Amr Radwan, Yasser Abdel‐Rady I. Mohamed,
This paper addresses ac microgrid stability under high penetration of converter-interfaced loads (CILs). According to the Nyquist admittance ratio criterion, destabilizing interaction dynamics are yielded among the interfacing voltage-source inverter (VSI) of the ac microgrid and CILs. Active stabilization techniques are proposed to maintain the overall system stability from the VSI side using admittance-based small signal analysis. Sensitivity and robustness analyses are presented to assess the dynamic ...
Tópico(s): Optimal Power Flow Distribution
2012 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Smart Grid
Amr Radwan, Yasser Abdel‐Rady I. Mohamed,
DC microgrids are gaining high momentum under the smart grid environment. DC microgrid stability can be an issue under high penetration of tightly regulated power converters used to interface distributed resources and loads. This paper addresses dc microgrid stability under high penetration of tightly regulated power electronic converters; and proposes three simple and computationally efficient active damping solutions that can be implemented to stabilize a controlled voltage-source converter (VSC) ...
Tópico(s): Frequency Control in Power Systems
2011 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Smart Grid
Louai Zaidan, Elhaitham K. Ahmed, Bachar N. Halimeh, Yasser Radwan, Khalil Terro,
Chylous ascites is considered to be an intra-abdominal collection of creamy colored fluid with triglyceride content of > 110 mg/dL. Chylous ascites is an uncommon but serious complication of numerous surgical interventions. However, it is a rare complication of LRYGB. An internal hernia limb defect is thought to be the underlying etiology, where the hernia will cause lymphatic vessel engorgement and lymphatic extravasation.We report a case of a 29 years old male with a 9 year history of laparoscopic ...
Tópico(s): Intestinal Malrotation and Obstruction Disorders
2018 - BioMed Central | BMC Surgery
Ahmed Abdelaziz, Yasser Radwan, Ahmed Rizk,
This study was undertaken to prospectively analyse, at a mean five-year follow-up, the clinical, functional, and radiographic outcomes in patients who developed postoperative acute septic knee arthritis following anterior cruciate ligament (ACL) reconstruction using hamstring autograft. We also assessed the effect of multiple arthroscopic debridement and graft retention on the functional outcomes in comparison with the matched control group.From a consecutive case series of 2,560 ACL-injured patients ...
Tópico(s): Orthopedic Infections and Treatments
2013 - Springer Science+Business Media | International Orthopaedics
Yasser Radwan, Ali Mansour, Walid S. Badawy,
To compare the results of Extracorporeal shock wave (ESWT) with a modified endoscopic plantar fasciotomy technique for the treatment of recalcitrant heel pain. Sixty-five patients suffering from chronic heel pain that failed to respond to standard nonoperative methods were randomized to undergo either high-energy extracorporeal shock wave therapy (group 1), or modified endoscopic plantar fasciotomy (group 2). The primary outcome measure was the reduction of pain in the two groups from base line to ...
Tópico(s): Sports injuries and prevention
2012 - Springer Science+Business Media | International Orthopaedics
Yasser Radwan, Atef A. Alfeky, Mohammed F. Faramawi,
This work aimed to evaluate the analgesic efficacy of intra-articular injection of magnesium sulphate (4%) compared with equivalent volume of bupivacaine (0.5%) after outpatient knee arthroscopic meniscectomy. Forty patients were randomly assigned to two groups. Group M (n = 20) received intra-articular magnesium sulphate 4%, group B (n = 20) received bupivacaine (0.5%). Analgesic effect was evaluated by analgesic duration, and by measuring pain intensity at 1, 2, 4, 6, 12, 24 h both at rest and on knee ...
Tópico(s): Nausea and vomiting management
2012 - Elsevier BV | Journal of Advanced Research
Tópico(s): Lower Extremity Biomechanics and Pathologies
2012 - Springer Science+Business Media | Archives of Orthopaedic and Trauma Surgery
Yasser Radwan, Gamal ElSobhi, Walid S. Badawy, Ali Reda, Sherif Khalid,
Fifty-six patients who suffered from chronic persistent tennis elbow of more than six months duration were randomly assigned to two active treatment groups. Group 1 (n = 29) received high-energy extracorporeal shock wave treatment (ESWT; 1,500 shocks) at 18 kV (0.22 mJ/mm2) without local anaesthesia; group 2 (n = 27) underwent percutaneous tenotomy of the common extensor origin. Both groups achieved improvement from the base line at three weeks, six weeks, 12 weeks and 12 months post-intervention. The success ...
Tópico(s): Shoulder Injury and Treatment
2007 - Springer Science+Business Media | International Orthopaedics
A.M. AL-Dughaym, A. FADL ELMULA, G.E. MOHAMED, Amira Aly Hegazy, Yasser Radwan, Fadhel Housawi, A. A. Gameel,
Although a case of human listeriosis has recently been reported in Saudi Arabia, the disease has not been reported in animals to date. The authors describe an outbreak of septicaemic listeriosis in sheep, which occurred during winter. Adult animals and pregnant ewes were principally affected, with a morbidity rate of 7.1% and a mortality rate of 2.4%; no abortions were recorded during the outbreak. Clinical signs included inappetence, weakness, fever, respiratory distress, keratoconjunctivitis and ...
Tópico(s): Essential Oils and Antimicrobial Activity
2001 - World Organisation for Animal Health | Revue Scientifique et Technique de l OIE
Reto Kurmann, Edward El‐Am, Yasser Radwan, Avneek Singh Sandhu, Cynthia S. Crowson, Eric L. Matteson, Kenneth J. Warrington, Rekha Mankad, Ashima Makol,
Objective. Cardiac involvement is a poor prognostic marker in systemic sclerosis (SSc). While diastolic dysfunction, myocardial fibrosis, and arrhythmias are traditionally considered features of primary cardiac involvement in SSc, the incidence of valvular heart disease (VHD) is not well reported. Our objective was to examine the prevalence of VHD at the time of SSc diagnosis and incidence of VHD during follow-up compared to non-SSc subjects. Methods. Medical records of patients with suspicion of ...
Tópico(s): Inflammatory Myopathies and Dermatomyositis
2021 - The Journal of Rheumatology Publishing Company Limited | The Journal of Rheumatology
Mohamed Abo-Elsoud, Yasser Radwan, Mohamed Gobba, Fouad Sadek,
We evaluated the potential advantages of short-segment fixation of certain anterior acetabular fracture patterns through a limited ilioinguinal approach.Two patient groups were studied. The first group comprised 22 patients (20 men, two women; average age 36 years) treated using the short-segment fixation protocol through a limited ilioinguinal approach. We modified the use of short pelvic brim plates, spring plates and posterior-column screws as reduction and fixation tools (leaving the distal end ...
Tópico(s): Pregnancy-related medical research
2014 - Springer Science+Business Media | International Orthopaedics
Amr Radwan, Yasser Abdel‐Rady I. Mohamed, Ehab F. El‐Saadany,
This paper presents a performance characterization and efficient modeling of the dc-side interactions between renewable dc resources and interfacing voltage-source inverters (VSIs). The VSI is considered in both grid-connected and islanded modes of operation. On the other side, the dc source is modeled by an equivalent and a detailed circuit. In the former, an ideal current-source in parallel to a dc capacitor is used to represent a non-dispatchable source whereas an ideal dc voltage source is used ...
Tópico(s): Advanced DC-DC Converters
2014 - Elsevier BV | Sustainable Energy Grids and Networks
Khalid Saeed Al-Asad, Adolfo Martinez Salazar, Yasser Radwan, En‐Hua Wang, Mohammad Fahad Salam, Rand Sabanci, Moiz Saeed, Adnan Halboni, Abdullah Al‐Abcha, George S. Abela,
Because of its anatomic and procedural complexities, bicuspid aortic valve (BAV) has been excluded from previous trials investigating transcatheter aortic valve replacement (TAVR). We aimed to compare the clinical outcomes of TAVR in BAV and tricuspid aortic valve patients. We searched the databases systematically from inception until March 2023 for studies that reported the outcomes of TAVR in BAV and tricuspid aortic valve patients. The primary focus was all-cause mortality at 1 year. Additional ...
Tópico(s): Infective Endocarditis Diagnosis and Management
2023 - Elsevier BV | The American Journal of Cardiology
Mohamed El Sayed, Amr El-Maradny, Radwan Al Farawati, Yasser A. Shaban,
Tópico(s): Water Quality and Pollution Assessment
2011 - | Journal of King Abdulaziz University-Marine Sciences
Fady Daniel, Lara Hassoun, Mohammad Husni, Alaa Sharara, Assad Soweid, Kassem Barada, Basel Haffar, Radwan Massoud, Yasser H. Shaib, JANA G. AL-HASHASH, Ali Bazarbachi, Jean El Cheikh,
Gastrointestinal (GI) graft versus host disease (GVHD) occurs in up to 40% of patients undergoing allogenic hematopoietic stem cell transplantation (HSCT). However, the optimal endoscopic approach is still unclear and the area of the GI tract with the highest diagnostic yield is still a topic of debate. We compared the diagnostic yield of different anatomic site biopsies in the diagnosis of GI GVHD and assessed the correlation of endoscopic findings with histopathology. All cases of biopsy proven GI ...
Tópico(s): Neutropenia and Cancer Infections
2018 - Elsevier BV | Current Research in Translational Medicine
Mohammad Adnan K. Magableh, Amr Radwan, Yasser Abdel‐Rady I. Mohamed,
Accurate parameters of photovoltaic (PV) arrays are essential for the modeling, analysis, and control of PV systems. Due to the lack of complete datasheets from manufacturers, different techniques have been introduced to extract the unknown parameters of PV modules. A novel approach based on one of the most recent metaheuristic (MH) optimization algorithms, the Flow Direction Algorithm, is developed in this paper to estimate the PV-modules parameters accurately. The proposed approach extracts the ...
Tópico(s): Solar Thermal and Photovoltaic Systems
2023 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Power Systems
Mahmoud Radwan, Sabry Shehata, Yasser Mohamed Abdelhadi, Ramadan Mohammed, Mohamed Mohamed, Mohammad Magdy,
Knowledge of the endemic fauna of parasites in fish are of great importance, parasites could synergistically act as stressors to health of their hosts. The objectives of this study were to evaluate prevalence and effect of parasites on hematological, biochemical indices, injury of tissues and length weight relationship of Clarias, gariepinus. Water quality variables were measured and fishes were collected each seasons for examination most common parasites in infected fishes at Abbasa Fish Farm, ...
Tópico(s): Parasite Biology and Host Interactions
2021 - Central Fisheries Research Institute of Türkiye | Turkish Journal of Fisheries and Aquatic Sciences
Radwan Kh Al-Farawati, Yasser A. Shaban, Adnan J. Turki, Yasar N. Kavil, Mousa Zobidi,
Environmental contextContamination of water resources with arsenic is a serious environmental problem requiring efficient, viable and environmentally safe As removal processes. This study reports an arsenic remediation strategy using carbon modified titanium dioxide supported on activated carbon as a photocatalyst. The study highlights a practical process for efficient remediation of As-contaminated water under natural sunlight. AbstractCarbon-modified titanium oxide nanoparticles supported on activated ...
Tópico(s): Advanced Photocatalysis Techniques
2020 - CSIRO Publishing | Environmental Chemistry
Mahmoud A. Elshenawy, Amr Radwan, Yasser Abdel‐Rady I. Mohamed,
Grid-forming solid-state transformer (GFm-SST) is an emerging technology in modernized power grids that delivers the merits of SSTs and GFm control, thus, providing a compact, controllable, and grid-supporting means of renewable resources integration. This article presents a comprehensive and coordinated GFm controller for two-stage SST-interfaced solar photovoltaic (PV) systems. The controllers of both SST stages are coordinated, and a virtual governor is implemented within the coordinated reference ...
Tópico(s): Islanding Detection in Power Systems
2023 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Energy Conversion