Marwa Khairy, M.D. HEBA N.A.H. ABDEL MENAEM ABEER A. ABDEL-RAHMAN, Maissa El Raziky, Wafaa Elakel, Naglaa Zayed, Hany Khatab, Gamal Esmat,
Hepatic fibrosis is an inclusion indicator for treatment and a major independent predictor of treatment response in patients with chronic hepatitis C. Liver biopsy, considered as the "gold standard" for evaluating liver fibrosis, has carried some drawbacks. Currently used noninvasive predictors of fibrosis are considered less accurate than liver biopsy.Our aim was to assess noninvasive predictors of fibrosis in patients with chronic hepatitis C using the routine laboratory pre-treatment workup.Cross ...
Tópico(s): Hepatitis B Virus Studies
2012 - Kowsar Publishing | Hepatitis Monthly
Mahmoud Hamouda, Amir Abdel Menaem, Hegazy Rezk, Mohamed N. Ibrahim, László Számel,
Switched reluctance motors (SRMs) have been receiving great attention in electric vehicle (EV) applications. However, the complicated control and inherent torque ripples are the major drawbacks of SRMs. This paper introduces a numerical estimation method for the optimum control parameters of SRM based on a simplified average torque control (ATC) strategy for EVs. The proposed control aims to simplify the control algorithm to cut down complexity and cost. Besides, it aims to achieve all the vehicle ...
Tópico(s): Induction Heating and Inverter Technology
2020 - Multidisciplinary Digital Publishing Institute | Mathematics
Amir Abdel Menaem, Mohamed Elgamal, Abdel‐Haleem Abdel‐Aty, Emad E. Mahmoud, Zhe Chen, Mohamed A. Hassan,
In this article, a new soft starting control scheme based on an artificial neural network (ANN) is presented for a three-phase induction motor (IM) drive system. The main task of the control scheme is to keep the accelerating torque constant at a level based on the value of reference acceleration. This is accomplished by the proper choice of the firing angles of thyristors in the soft starter. Using the ANN approach, the complexity of the online determination of the thyristors firing angles is resolved. ...
Tópico(s): Advanced Algorithms and Applications
2020 - Institute of Electrical and Electronics Engineers | IEEE Access
Mohamed Elgamal, Nikolay Korovkin, A. Elmitwally, Amir Abdel Menaem, Zhe Chen,
In this paper, an energy management system (EMS) is proposed for optimal operation of a microgrid (MG). Dispersed photovoltaic arrays (PVs) and wind turbine generators (WTs) as renewable energy sources (RES) supply a major part of the network demanded energy. Also, an energy storage system (ESS), a micro-turbine unit (MT), and a fuel cell unit (FC) are integrated. The uncertainty and stochastic nature of the network load and RES data are treated via probabilistic modeling and scenario-selection approach. ...
Tópico(s): Hybrid Renewable Energy Systems
2020 - Institute of Electrical and Electronics Engineers | IEEE Access
Mahmoud Hamouda, Amir Abdel Menaem, Hegazy Rezk, Mohamed N. Ibrahim, László Számel,
The switched reluctance motors (SRMs) are powerful alternatives for electric vehicles (EVs). However, the high torque ripple is the main obstacle for their acceptance in high-performance applications. This paper introduces an improved indirect instantaneous torque control (IITC) strategy of SRMs for EVs. It aims to achieve the vehicle requirements including maximum torque per ampere (MTPA), minimum torque ripple, high efficiency, and extended speed range. First, a simple analytical formulation that ...
Tópico(s): Induction Heating and Inverter Technology
2020 - Elsevier BV | Energy Reports
Taher S. Hassan, Yuangong Sun, Amir Abdel Menaem,
In this paper, the functional dynamic equation of second order is studied on an arbitrary time scale under milder restrictions without the assumed conditions in the recent literature. The Nehari, Hille, and Ohriska type oscillation criteria of the equation are investigated. The presented results confirm that the study of the equation in this formula is superior to other previous studies. Some examples are addressed to demonstrate the finding.
Tópico(s): Differential Equations and Numerical Methods
2020 - Multidisciplinary Digital Publishing Institute | Mathematics
Mahmoud Hamouda, Amir Abdel Menaem, Hegazy Rezk, Mohamed N. Ibrahim, László Számel,
Due to the expected increase in the electric vehicles (EVs) sales and hence the increase of the price of rare-earth permanent magnets, the switched reluctance motors (SRMs) are gaining increasing research interest currently and in the future. The SRMs offer numerous advantages regarding their structure and converter topologies. However, they suffer from the high torque ripple and complex control algorithms. This paper presents an improved direct instantaneous torque control (DITC) strategy of SRMs ...
Tópico(s): Wireless Power Transfer Systems
2021 - Multidisciplinary Digital Publishing Institute | Mathematics
Mohamed Elgamal, Nikolay Korovkin, Amir Abdel Menaem, A. Elmitwally,
This paper proposes a new operation management scheme (OMS) for next-day complex power scheduling in an islanded reconfigurable microgrid. Energy supply in the microgrid comes from wind turbines and photovoltaic generators as renewable dispersed generators (RDG). Meanwhile, there are two microturbine units and a fuel cell unit as dispatchable distributed generators (DDG). Also, a battery bank energy storage system (BESS) is integrated. The microgrid has a number of controllable tie-switches to change ...
Tópico(s): Hybrid Renewable Energy Systems
2021 - Elsevier BV | Applied Energy
M. A. Abdel-Menaem, Ahmed Attia, M. I. El-Emery, Eman Fayed,
In 2007, five maize inbred lines were crossed in all possible combinations without reciprocals by using a half diallel crosses mating design to obtain 10 single cross.Inbred parents and their F1 single crosses were evaluated through 2008 season to evaluate the role of general and specific combining ability and heterosis for some agronomic traits.Results indicated that mean squares of genotypes were highly significant for all studied traits i.e. ear diameter, ear length, number of kernels/row, 100- ...
Tópico(s): Genetic Mapping and Diversity in Plants and Animals
2009 - Mansoura University | Journal of Plant Production
Taher S. Hassan, Rami Ahmad El‐Nabulsi, Amir Abdel Menaem,
In this paper, the sharp Hille-type oscillation criteria are proposed for a class of second-order nonlinear functional dynamic equations on an arbitrary time scale, by using the technique of Riccati transformation and integral averaging method. The obtained results demonstrate an improvement in Hille-type compared with the results reported in the literature. Some examples are provided to illustrate the significance of the obtained results.
Tópico(s): Differential Equations and Numerical Methods
2021 - Multidisciplinary Digital Publishing Institute | Mathematics
Taher S. Hassan, Rami Ahmad El‐Nabulsi, Naveed Iqbal, Amir Abdel Menaem,
In this study, novel criteria are derived to ensure the oscillation of solutions in nonlinear advanced noncanonical dynamic equations. The obtained results are reminiscent of the criteria proposed by Hille and Ohriska for canonical dynamic equations. Additionally, this paper addresses a previously unresolved issue found in numerous existing works in the literature on advanced dynamic equations. This study provides a range of illustrative examples to showcase the precision, practicality, and adaptability ...
Tópico(s): Differential Equations and Numerical Methods
2024 - Multidisciplinary Digital Publishing Institute | Mathematics
Taher S. Hassan, Martin Böhner, Loredana Florentina Iambor, Amir Abdel Menaem, Mouataz Billah Mesmouli,
In this work, we deduce a new criterion that guarantees the oscillation of solutions to linear Sturm–Liouville delay noncanonical dynamic equations; these results emulate the criteria of the Hille and Ohriska types for canonical dynamic equations, and these results also solve an open problem in many works in the literature. Several examples are offered, demonstrating that the findings achieved are precise, practical, and adaptable.
Tópico(s): Nonlinear Dynamics and Pattern Formation
2023 - Multidisciplinary Digital Publishing Institute | Mathematics
Amir Abdel Menaem, Vladislav Oboskalov,
In this paper, a new integration approach for renewable energy sources (RESs), especially intermittent resources (i.e., PV and wind), is presented considering RESs planning uncertainties issues, which are size and location of units, and RESs operational uncertainties issues including operation mode of units and the stochastic nature of prime energy sources (solar irradiance and wind speed). The approach composes of three stages: uncertainties sources modelling, uncertainties expansion, and optimizing ...
Tópico(s): Frequency Control in Power Systems
2019 - Springer Nature | Advances in intelligent systems and computing
Faouzi H. Ouerghi, Mohamed Omri, Amir Abdel Menaem, Ahmed I. Taloba, Rasha M. Abd El-Aziz,
In many different places, wind energy has the potential to solve many challenges. Reducing dependency on distant power networks increases energy security, provides an alternative to energy independence, and advances environmental sustainability as a renewable energy source. Furthermore, the development of wind energy established in these regions improves regional economies and creates possibilities for employment in manufacturing, construction, maintenance, and operation. Landowners might receive ...
Tópico(s): Integrated Energy Systems Optimization
2024 - Elsevier BV | Alexandria Engineering Journal
Manish Kumar Singla, Jyoti Gupta, Murodbek Safaraliev, Parag Nijhawan, Amandeep Singh Oberoi, Amir Abdel Menaem,
Electrochemical hydrogen storage is considered as the safest mode compared to the other storage forms, which is why it has attracted a significant research attention in the past decade. Carbon-based porous mediums offer many benefits that favor hydrogen adsorption in it. The presented work investigates the feasibility of coconut shell derived activated carbon for hydrogen adsorption by ascertaining its physical and chemical characteristics. The procedure employed for characterization is disclosed. ...
Tópico(s): Biodiesel Production and Applications
2024 - Elsevier BV | International Journal of Hydrogen Energy
Sarah A. Alzakari, Amir Abdel Menaem, Nadir Omer, Amr Abozeid, Loay F. Hussein, Islam Abdalla Mohamed Abass, Ayadi Rami, Ahmed Elhadad,
Tópico(s): Non-Invasive Vital Sign Monitoring
2024 - Elsevier BV | Alexandria Engineering Journal
Manpreet Singh, Manish Kumar Singla, Murodbek Safaraliev, Kulwinder Singh, Ismoil Odinaev, Amir Abdel Menaem,
Tópico(s): Electric and Hybrid Vehicle Technologies
2024 - Elsevier BV | International Journal of Hydrogen Energy
Mohamed Elgamal, Nikolay Korovkin, Amir Abdel Menaem, A. Elmitwally,
Power flow analysis (PF) is an essential tool for secure and efficient operation in power systems. For isolated microgrid (IMG) with only local distributed generators (DGs), there is no slack bus that enables the microgrid to have a constant frequency. So, the bus admittance matrix (Ybus) is not fixed. Also, IMG usually has droop-controlled DGs (DCDG) whose voltage and power are frequency-dependent. These factors make PF a challenging task for IMG that cannot be accomplished through the classic PF techniques. ...
Tópico(s): Islanding Detection in Power Systems
2022 - Elsevier BV | Sustainable Energy Grids and Networks
Tópico(s): Biblical Studies and Interpretation
2003 - Cambridge University Press | AJS Review The Journal of the Association for Jewish Studies
Amir Abdel Menaem, Rustam Valiev, Vladislav Oboskalov, Taher S. Hassan, Hegazy Rezk, Mohamed N. Ibrahim,
With the growing robustness of modern power systems, the occurrence of load curtailment events is becoming lower. Hence, the simulation of these events constitutes a challenge in adequacy indices assessment. Due to the rarity of the load curtailment events, the standard Monte Carlo simulation (MCS) estimator of adequacy indices is not practical. Therefore, a framework based on the enhanced cross-entropy-based importance sampling (ECE-IS) method is introduced in this paper for computing the adequacy ...
Tópico(s): Infrastructure Resilience and Vulnerability Analysis
2020 - Multidisciplinary Digital Publishing Institute | Mathematics
Mouataz Billah Mesmouli, Loredana Florentina Iambor, Amir Abdel Menaem, Taher S. Hassan,
In this article, we mainly generalize the results in the literature for a fractional q-difference equation. Our study considers a more comprehensive type of fractional p,q-difference system of nonlinear equations. By the Banach contraction mapping principle, we obtain a unique solution. By Krasnoselskii’s fixed-point theorem, we prove the existence of solutions. In addition, finite stability has been established too. The main results in the literature have been proven to be a particular corollary ...
Tópico(s): Numerical methods for differential equations
2024 - Multidisciplinary Digital Publishing Institute | Mathematics
Heba Abdel Menaem, M.K. MOUSTAFA, Rania Sarhan, Samia William, Abeer Abdel-Rahman,
Background: Schistosomiasis is a major tropical disease with significant morbidity and mortality inseveral developing countries. Hence, searching for a new immunomodulating supportive aid for the soledrug of choice, praziquantel (PZQ), is an important target.Objective: The aim of the present work is to assess the immunomodulatory effect of Kalobin (Pelargoniumreinforme/sidoides extract) on schistosomiasis mansoni in vivo.Material and Methods: Swiss albino mice were infected with S. mansoni cercariae ...
Tópico(s): Child Nutrition and Feeding Issues
2022 - Medknow | Parasitologists United Journal
Taher S. Hassan, Amir Abdel Menaem, Yousef Jawarneh, Naveed Iqbal, Akbar Ali,
<abstract><p>This paper employed the well-known Riccati transformation method to deduce a Kneser-type oscillation criterion for second-order dynamic equations. These results are considered an extension and improvement of the known Kneser results for second-order differential equations and are new for other time scales. We have included examples to highlight the significance of the results we achieved.</p></abstract>
Tópico(s): Advanced Mathematical Modeling in Engineering
2024 - American Institute of Mathematical Sciences | AIMS Mathematics
Taher S. Hassan, Rabie Α. Ramadan, Zainab Alsheekhhussain, Ahmed Y. Khedr, Amir Abdel Menaem, Ismoil Odinaev,
This paper aims to improve Hille oscillation criteria for the third-order functional dynamic equation p2(ξ)ϕγ2p1ξϕγ1yΔ(ξ)ΔΔ+a(ξ)ϕγy(g(ξ))=0, on an above-unbounded time scale T. The obtained results improve related contributions reported in the literature without restrictive conditions on the time scales. To demonstrate the essential results, an example is presented.
Tópico(s): Fractional Differential Equations Solutions
2022 - Multidisciplinary Digital Publishing Institute | Mathematics
Mohamed Elgamal, Abdelfattah A. Eladl, Bishoy E. Sedhom, Ahmed N. Sheta, Ahmed Refaat, Amir Abdel Menaem,
Tópico(s): Adversarial Robustness in Machine Learning
2025 - Elsevier BV | Internet of Things
Mahmoud Hamouda, Hanaa Elsherbiny, Alaa A. Zaky, Ismoil Odinaev, Vladimír Bureš, Amir Abdel Menaem,
Tópico(s): Smart Grid Energy Management
2025 - Institute of Electrical and Electronics Engineers | IEEE Access
Amr Naguib, Ahmed Fayyad, Ashraf Abdel-Menaem,
This study was conducted to clinically and radiographically evaluate the effect of retaining mandibular overdenture, by retention silicon material, on the bone level of the abutment teeth. The patients were randomly divided into two groups A and B. All patients were treated by upper conventional complete dentures opposed by tooth supported lower complete overdentures. In group A, the overdenture abutment teeth were covered by post and copping carrying an attachment. Retention Silicon act as housing ...
Tópico(s): Orthodontics and Dentofacial Orthopedics
2016 - The Egyptian Dental Association | Egyptian Dental Journal /Egyptian Dental Journal
Ahmed Rezk, MohamedF Elsherbiny, K. Saláma, Ibrahim Souidan, M.M. Abd El-Menaem,
Implantation rate per embryo transferred usually does not exceed 30%, although higher rates with use of blastocysts have been reported, depending on age.Successful implantation depends on development of high-quality embryos and the acquisition of endometrial receptivity.Implantation failure is attributed to the failure of uterus to acquire receptivity.Implantation failure remains a major factor limiting success in vitro fertilization (IVF) treatment.Mechanical manipulation of the endometrium can ...
Tópico(s): Endometriosis Research and Treatment
2019 - | Benha Journal of Applied Sciences
M.D. SAYED GABER SABRY ABDEL FATAH EBRAЮM, M.D. MOHAMED ABDEL MENAEM SAYED FAROUK MOHAMED,
Background: Gastroesophageal reflux disease (GERD) is chronic illness caused by reflux of gastric acidic contents back up into the esophagus causing wide range of symptoms.Laryngeal reflux is caused by A mechanism which seem identical to GERD some researchers think there is correlation between the prevalence of the two diseases. Aim of Study:The study aimed to evaluate the prevalence of laryngeal reflux in cases of gastroesophageal reflux disease. Methods:In this Prospective study evaluation of the ...
Tópico(s): Helicobacter pylori-related gastroenterology studies
2019 - Clinical Society of Cairo University | The Medical Journal of Cairo University/The Medical Journal of Cairo University
M.D. MOHAMED ABDEL MENAEM SAYED FAROUK MOHAMED, MahmoudAbu Elfadl, Mohamed S.Abdelaziz Shehata, AhmedS Elskaan,
Background Transarterial chemoembolization has become the current standard therapy for the intermediate-stage hepatocellular carcinoma (HCC) according to the Barcelona Clinic Liver Cancer staging system. Conventional transarterial chemoembolization (cTACE) involves the injection of an embolic agent into the tumor-feeding arteries to block its major nutrient source resulting in tumor ischemic necrosis. Drug-eluting beads transarterial chemoembolization (DEB-TACE) was developed to deliver higher doses ...
Tópico(s): Cancer Mechanisms and Therapy
2019 - Medknow | Al-Azhar Assiut Medical Journal