282 results on '"Ahmed, Shehab"'
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2. Experimental investigation of the rock cutting process and derivation of the 3D spatial distribution of the formation strength using in-cutter sensing
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Koulidis, Alexis, Pelfrene, Gilles, and Ahmed, Shehab
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- 2024
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3. Experimental and numerical study of a photovoltaic/thermal system cooled by metal oxide nanofluids
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Mohammed Alktranee, Qudama Al-Yasiri, Mohammed Ahmed Shehab, Péter Bencs, Zoltán Németh, and Klara Hernadi
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Photovoltaic ,Nanofluids ,Numerical model ,Exergy efficiency ,Exergy destruction ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Photovoltaic modules are impacted by overheating, which degrades their conversion efficiency and shortens their lifespan. This work attempts to study the cooling potential for a hybrid photovoltaic/thermal (PV/T) system by employing CuO and Fe2O3 nanofluids with 0.2% and 0.3% volume fractions (φ), circulated in a heat exchanger attached at the rear side of the PV module to lower the temperature of the PV cells and improve its energy and exergy efficiencies. Consequently, a 2D numerical model was analysed given the energy balance across the PV/T system layers, which is evaluated in line with measured experimental data. The results indicate that the successfully synthesised nanomaterials could improve the performance of the nanofluids and increase the heat exchange between PV/T system layers, reducing the PV cells’ temperature by 23.49% and 34.58% when cooling by CuO and Fe2O3 nanofluids at φ=0.3%. Compared to the uncooled PV module, the electrical efficiency has increased by 9.21% and 10.30%, while thermal efficiency increased by 38.9% and 43.3% under cooling with CuO and Fe2O3 nanofluids, respectively. Thereby, the exergy destruction (exergy losses) and entropy generation have decreased by about 26% and 68% when cooling with Fe2O3 nanofluid, which improved the exergy efficiency by 13% more than CuO nanofluid.
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- 2024
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4. Effect of zirconium oxide nanofluid on the behaviour of photovoltaic–thermal system: An experimental study
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Mohammed Alktranee, Mohammed Ahmed Shehab, Zoltán Németh, Péter Bencs, and Klara Hernadi
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PV module ,Nanofluids ,Exergy analysis ,Electrical power ,Entropy generation ,Thermal exergy ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
Recently, photovoltaic technology applications have occupied a wide range in electric generation. The temperature rising higher than the operating temperature permissible is the weak point facing this technology, which significantly influences the performance of the photovoltaic cells. Using nanofluids as the coolant of photovoltaic (PV) modules is an effective method, circulating nanofluids in the heat exchanger attached to the backside of the PV module to absorb excess heat and enhance the performance of the PV module. The current work investigates using zirconium oxide (ZrO 2) nanofluid as a coolant at different volume concentrations (0.015 vol%, 0.025 vol%, 0.0275 vol%) in deionized (DI) water to reduce the temperature of the photovoltaic PV cells and then analyses the performance from the energy/exergy viewpoints. The results indicate that the PV module temperature was reduced by 10.2 °C when cooled by ZrO 2 nanofluid at 0.0275% volume concentration in DI water compared to the reference PV module, resulting in remarkable system energy and exergy enhancement. Besides, the cooling by DI water has decreased the PV module temperature by 5.1 °C. The overall efficiencies gradually increment with an increase in volume concentration by 8.9%, 18.8 % and 24.4%, respectively, compared with PV modules cooled by DI water. Using ZrO 2 nanofluids with 0.0275 vol% could enhance the exergy efficiency by 66.8% and reduce the exergy losses and entropy generation by 7% and 26%, respectively.
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- 2023
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5. A novel Polyethersulfone/Chamomile (PES/Chm) mixed matrix membranes for wastewater treatment applications
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Rana I. Raja, Khalid T. Rashid, M.A. Toma, Adnan A. AbdulRazak, Mohammed Ahmed Shehab, and Klara Hernadi
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Polyethersulfone (PES) ,Chamomile leaves ,Ultrafiltration process ,Hydrophilicity ,Mixed Matrix Membranes ,Chemistry ,QD1-999 - Abstract
In order to address the limitation of low flux in ultrafiltration (UF), a suitable additive is introduced into the base polymer to modify the membrane morphology, thereby enhancing flux rates. In this study, chamomile leaf nanoparticles (Chm NPs) were investigated as a novel green material for utilizing in UF membrane synthesizes. To enhance comprehension of the influence of Chm on the synthesis of PES UF membranes, a series of membranes were fabricated by including different quantities of Chm into the casting solution; (0, 0.5, 1.5, and 2 wt. %.). The synthesized membranes were fully characterized, through the porosity, pore size, hydrophilicity, membrane morphology, and UF efficiency. Manufactured PES/Chm membranes demonstrated significantly increased permeate water flux (PWF) (up to 498 kg/m2 h), which was four times that of the pristine PES membrane (116 kg/m2 h), besides that the bovine serum albumin (BSA) and Congo red dye (CR) rejection of PES/Chm membranes was still kept high. The enhanced PWF was mostly due to the more porous membrane structure and increased hydrophilicity. Meanwhile, the higher surface hydrophilicity of the PES/Chm membranes resulted in greater antifouling performance and the high flux recovery ratio (FRR) of 93 %. Based on the results of this research, the Chm may be used as a novel green additive with substantial application potential in the fabrication of UF membranes wastewater treatment.
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- 2024
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6. Analysis and control of split-source current-type inverter for grid-connected applications
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Abdel-Moneim, Mohamed G., Hamad, Mostafa S., Abdel-Khalik, Ayman S., Hamdy, Ragi R., Hamdan, Eman, and Ahmed, Shehab
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- 2024
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7. Bubble dynamics and their effects on interfacial heat transfer in one single microchannel
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Han, Qun, Ma, Jiaxuan, Khan, Ahmed Shehab, Chang, Wei, Li, Chen, Tong, Yan, and Li, Wenming
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- 2024
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8. A novel Polyethersulfone/Chamomile (PES/Chm) mixed matrix membranes for wastewater treatment applications
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Raja, Rana I., Rashid, Khalid T., Toma, M.A., AbdulRazak, Adnan A., Ahmed Shehab, Mohammed, and Hernadi, Klara
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- 2024
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9. Thermodynamic analysis of mono and hybrid nanofluid effect on the photovoltaic-thermal system performance: A comparative study
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Mohammed Alktranee, Mohammed Ahmed Shehab, Zoltán Németh, Péter Bencs, and Klara Hernadi
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Nanofluids ,PV/T system ,Overall efficiency ,Exergy efficiency ,Entropy generation ,Economic analysis ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
The energy and exergy efficiency of a photovoltaic thermal (PV/T) system at various volume fractions is investigated with mono TiO2 nanofluid and new hybrid TiO2–Fe2O3 nanofluid. Serpentine tubes soldered on an absorbing plate attached to the rear of the PV module have been proposed to evaluate the effect of nanofluids on the PV/T temperature reduction, energy produced, and exergy losses. The study compared energy and exergy with previous studies and delivered an economic analysis to confirm the feasibility of applying nanofluids. The results indicated that using TiO2–Fe2O3 nanofluid reduced the PV cell's temperature by 42.19% compared to water, TiO2 nanofluid, which increased the electrical power by 74.5% and 46.22% when cooling by mono and hybrid nanofluid at 0.3 vol%. The PV/T system's maximum thermal and electrical efficiency recorded with mono and hybrid nanofluids was 34.6%, 8.44%, 47.2%, and 12.62%, respectively. Dispersion of hybrid nanocomposite in DI water has enhanced the Nu number and HTC by 42.72% and 23% higher than mono nanofluid, which improved the exergy efficiency of the PV/T system by 14.89%. A better payback period was achieved with a hybrid nanofluid by 54 days with reduced exergy losses by 45.5% and entropy generation by 86.29%.
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- 2023
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10. Optimum operating parameters for PES nanocomposite membranes for mebeverine hydrochloride removal
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Dhiyaa A. Hussein Al-Timimi, Qusay F. Alsalhy, Adnan A. AbdulRazak, Mohammed Ahmed Shehab, Zoltán Németh, and Klara Hernadi
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Nanocomposite membrane ,Modified nanoparticles ,Polyethylenimine ,Pharmaceuticals ,Wastewater treatment ,Mixed matrix membrane ,Mining engineering. Metallurgy ,TN1-997 - Abstract
This study aims to optimize operating parameters of the effect of embedded silica nanoparticles (SiO2 NPs) and modified silica NPs with polyethylenimine (PEI) (SiO2-g-PEI NPs) into polyethersulfone (PES) to fabricate a mixed matrix membranes (MMMs) for pharmaceutical wastewater treatment. The performance of modified MMMs was compared in the separation of Mebeverine hydrochloride (MBV) from aqueous pharmaceutical wastewater. In order to produce a particular quantity of flux and rejection above desired levels, an optimization technique was used to find the best values for various important process parameters. To enhance the effectiveness on a bigger scale, response surface methodology (RSM) and analysis of variance (ANOVA) were utilized as mathematical and statistical approaches. This study examined the effects of operational parameters on the PES-NPs membranes permeate flux and MBV rejection for each sample. These parameters included SiO2/or SiO2-g-PEI NPs content (0.7–1 wt %), solution feed pH values (4-10), and MBV concentration (10–100 ppm). A mathematical model to calculate the permeate flux and rejection (%) was established. The results showed that the SiO2 MMMs had the best performance of 38.27 LMH permeate flux and 81.26% of MBV rejection, while the permeate flux and MBV rejection % for SiO2-g-PEI MMMs were 104.11LMH and 99.00%. The SiO2 wt % of 0.8447%, MBV concentration of 98.18 ppm, and pH of 4 were the optimal parameters for the SiO2 MMMs, while the optimal parameters for SiO2-g-PEI MMMs were SiO2-g-PEI wt. % of 0.93%, MBV concentration of 22.7 ppm, and pH of 4.79 for eliciting the optimum response.
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- 2023
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11. Experimental study for improving photovoltaic thermal system performance using hybrid titanium oxide-copper oxide nanofluid
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Mohammed Alktranee, Mohammed Ahmed Shehab, Zoltán Németh, Péter Bencs, and Klara Hernadi
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Hybrid nanofluids ,PVT system ,Electrical power ,Exergy efficiency ,Exergy losses ,Payback period ,Chemistry ,QD1-999 - Abstract
Overheating of photovoltaic (PV) cell is one of the most common issues that cause the degradation of their function and reduce conversion efficiency. This work investigates the effect of using a novel TiO2-CuO hybrid nanofluid to improve the energy and exergy of photovoltaic thermal (PVT) systems by reducing PV cell temperature. Serpentine tubes soldered on an absorbing plate attached behind the PV module were proposed to improve heat removal of the PV module with volume concentrations of 0.2 vol% and 0.3 vol%, with a flow rate of 1.16 L/min. Improving the thermophysical properties of the hybrid nanofluid has reduced the temperature of the PV module by 39% more than the uncooled PV module. The PVT system's electrical power and overall efficiency improved by 77.5% and 58.2%, respectively, at increased volume concentration to 0.3 vol% compared with the uncooled PV module. The exergy analysis indicated an increase in the overall exergy efficiency by 14.97 %, with thermal exergy dropping because of the closer the outlet nanofluid temperature to ambient temperature. Hybrid nanofluid cooling has improved exergy efficiency to 14.97%, reducing exergy losses by 37.9% and entropy generation by 69.6% at 0.3 vol%. The economic analysis shows a better payback period of 21 months when cooling with a hybrid nanofluid compared with the uncooled PV module.
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- 2023
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12. Space vector-based model predictive current controller for grid-connected converter under unbalanced and distorted grid without a phase-locked loop
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El-Nagar, Mohammed, Elattar, Omar, Ahmed, Khaled, Hamdan, Eman, Abdel-Khalik, Ayman S., Hamad, Mostafa S., and Ahmed, Shehab
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- 2023
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13. Virus and bacterial removal ability of TiO2 nanowire-based self-supported hybrid membranes
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Ahmed Shehab, Mohammed, Szőri-Dorogházi, Emma, Szabó, Szilvia, Valsesia, Andrea, Chauhan, Tanya, Koós, Tamás, Muránszky, Gábor, Szabó, Tamás, Hernadi, Klara, and Németh, Zoltán
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- 2023
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14. Experimental study for improving photovoltaic thermal system performance using hybrid titanium oxide-copper oxide nanofluid
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Alktranee, Mohammed, Ahmed Shehab, Mohammed, Németh, Zoltán, Bencs, Péter, and Hernadi, Klara
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- 2023
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15. Virus and bacterial removal ability of TiO2 nanowire-based self-supported hybrid membranes
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Mohammed Ahmed Shehab, Emma Szőri-Dorogházi, Szilvia Szabó, Andrea Valsesia, Tanya Chauhan, Tamás Koós, Gábor Muránszky, Tamás Szabó, Klara Hernadi, and Zoltán Németh
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Hybrid membrane ,TiO2-based nanocomposites ,Micro CT ,E. coli removal ,MS2 removal ,Chemistry ,QD1-999 - Abstract
Development and application of hybrid membranes containing multi-component materials are increasing day by day in the fields of environmental protection and water treatment. In this research, the efficiency of titania nanowire (TiO2 NW)-based self-supported hybrid membranes was investigated in the removal of Escherichia coli (E. coli) bacteria and MS2 bacteriophages from contaminated water mimicking the microorganism suspension. Furthermore, toxicology tests on the as-prepared membranes were also performed. TiO2 NWs were coated with iron(III) oxide (Fe2O3) and copper(II) oxide (CuO) nanoparticles, respectively, and cellulose was used as reinforcement material. It was found that, the functionalisation strongly affected the MS2 removal ability of as-prepared membranes, which can be due to the electrostatic interactions between the surface of hybrid membrane and the bacteriophages. The most efficient removal (greater than or equal to 99.99%) was obtained with the TiO2 NW-CuO-cellulose membrane at pH 7.0. The fabricated hybrid membranes were characterized by micro computed tomography (μCT), Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR), dynamic light scattering (DLS), contact angle measurement and inductively coupled optical emission spectrometry (ICP-OES) techniques. This study shows a simple route of the usage of novel and effective inorganic nanowire-based hybrid membranes for bacteria and virus removal, providing new pathways in the field of water filtration technologies.
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- 2023
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16. Predictive current control based pseudo six-phase induction motor drive
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Habib, Abdelrahman, Shawier, Abdullah, Mamdouh, M., Samy Abdel-Khalik, Ayman, Hamad, Mostafa S., and Ahmed, Shehab
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- 2022
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17. Synthesis, characterization, and challenges faced during the preparation of zirconium pillared clays
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Chauhan, Tanya, Udayakumar, Mahitha, Ahmed Shehab, Mohammed, Kristály, Ferenc, Katalin Leskó, Anett, Ek, Martin, Wahlqvist, David, Tóth, Pál, Hernadi, Klara, and Németh, Zoltán
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- 2022
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18. Comprehensive characterization of amino acid positions in protein structures reveals molecular effect of missense variants
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Iqbal, Sumaiya, Pérez-Palma, Eduardo, Jespersen, Jakob B., May, Patrick, Hoksza, David, Heyne, Henrike O., Ahmed, Shehab S., Rifat, Zaara T., Rahman, M. Sohel, Lage, Kasper, Palotie, Aarno, Cottrell, Jeffrey R., Wagner, Florence F., Daly, Mark J., Campbell, Arthur J., and Lal, Dennis
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- 2020
19. Energy and exergy assessment of photovoltaic-thermal system using tungsten trioxide nanofluid: An experimental study
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Mohammed Alktranee, Mohammed Ahmed Shehab, Zoltán Németh, Péter Bencs, Klara Hernadi, and Tamás Koós
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Nanofluid ,Electrical power ,Thermal exergy ,PVT system ,Entropy generation ,Heat ,QC251-338.5 - Abstract
The temperature rising of the photovoltaic (PV) modules is a major issue leading to a reduction in their conversion efficiency and low output power. Therefore, removing heat from the PV module is necessary to permanently work and improve the electrical power output. Serpentine pipes and a thermal absorber plate has proposed with fluid circulation to reduce the PV cell temperature and improve their efficiency. The current work experimentally investigates the effect of using tungsten trioxide (WO3) nanofluids on the PVT system's energy and exergy efficiency at different volume concentrations of 0. 5 vol%, 0. 75 vol%, and 1 vol%. The results indicated an increment in the electrical power output by 11.15 W due to reducing the PV temperature by 21.4% and enhancing the PVT overall efficiency by 29.6% compared with the cooling by Deionized (DI) water. Increasing the volume concentration of nanoparticles increased the Reynolds number, and the Nusselt number enhanced the heat transfer coefficient and increased the pressure drop. Improving the thermal properties of the nanofluid has increased the electrical exergy efficiency and lowered the thermal exergy efficiency due to the reduction in thermal exergy quality. Compared to DI water cooling, exergy losses and entropy generation were reduced by 10% and 34.8%, respectively.
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- 2022
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20. Widespread applicability of bacterial cellulose-ZnO-MWCNT hybrid membranes
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El Mrabate, Bilal, Szőri-Dorogházi, Emma, Ahmed Shehab, Mohammed, Chauhan, Tanya, Muránszky, Gábor, Sikora, Emőke, Filep, Ádám, Sharma, Nikita, Nánai, Lilla, Hernadi, Klara, and Németh, Zoltán
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- 2021
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21. Synthesis, characterization, and challenges faced during the preparation of zirconium pillared clays
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Tanya Chauhan, Mahitha Udayakumar, Mohammed Ahmed Shehab, Ferenc Kristály, Anett Katalin Leskó, Martin Ek, David Wahlqvist, Pál Tóth, Klara Hernadi, and Zoltán Németh
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Montmorillonite ,Zr-PILCs ,Pillaring ,Sodium-saturated montmorillonite ,Specific surface area ,Basal spacing ,Chemistry ,QD1-999 - Abstract
In this study, Zr-pillared montmorillonite clays (Zr-PILCs) were synthesized using two different precursor materials: raw montmorillonite (CM) and sodium ion-saturated montmorillonite (Na-CM) at different Zr/clay ratios (2.5, 5 and 10 mmol/g). To study the effect of Zr concentration and clay pre-treatment with NaCl on pillaring, the modified clay samples were characterized in detail using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), high-resolution transmission electron microscopy (HRTEM), scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy (STEM-EDX). The XRD analysis showed the increase of basal spacing of Zr-PILCs prepared from both precursor materials: from 1.26 to 1.74 nm in the case of CM, and from 1.13 to 1.93 nm for Na-CM. Results from FT-IR revealed new bands ascribed to Zr-O bonds in the range of 400–500 cm−1 in Zr-pillared samples obtained from Na-CM at Zr/clay ratios of 2.5 and 5 mmol/g. The distribution and nature of Zr species in between the silicate layers were studied using STEM-EDX and HAADF imaging. They were found to be separated by a distance of 1.5–3 nm and their thickness lies in the range of 1–2 nm. Pillared clays prepared from pre-treatment with NaCl were more thermally stable at higher temperatures.
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- 2022
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22. Influence of dietary combinations of Amphora coffeaeformis with linseed oil or sunflower oil on performance, fatty and amino acid profiles, oxidative stability and meat quality of broiler chickens
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Sabry M. El-Bahr, Saad Al-Sultan, Mohammed A. Alfattah, Ahmed Shehab, Islam Sabeq, Saad Shousha, Omar Ahmed-Farid, Osama El-Garhy, Khalid A. Albusadah, Sameer Alhojaily, and Wasseem Khattab
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chickens ,microalgae ,meat quality ,antioxidants ,biomarkers ,Animal culture ,SF1-1100 - Abstract
This study aimed to evaluate the effect of dietary linseed oil, sunflower oil, and their supplementation with Amphora coffeaeformis (AC) on growth performance, carcase characteristics, fatty and amino acid profiles, oxidative stability, and meat quality of broiler chickens. One hundred and eighty day-old broiler chicks were divided into four groups (five replicates per group, 9 birds per each replicate pen). Birds in groups 1, 2, 3, and 4 fed diets containing 3% sunflower oil without AC (SFO 3%), 3% SFO with 1 g/kg diet of AC (SFAC), 3% linseed oil without AC (LSO 3%) and 3% LSO oil with 1 g/kg diet of AC (LSAC), respectively for 32 days. Final weight and weight gain were increased whereas fat pads were decreased in birds fed diets containing SFAC or LSAC compared to other groups. The values of omega-3 fatty acids, essential amino acids, and antioxidants were increased while saturated fatty acids (SFA) declined in the meat of birds fed diets supplemented with AC (SFAC & LSAC) compared to other groups. Lysine levels in the meat of birds fed AC and/or linseed diets were inversely related to hepatic L-carnitine levels. Breast meats of different broiler groups did not differ significantly in quality traits. However, broilers fed AC-containing diets had relatively lower yellowness, redness, and Chroma values. Conclusively, dietary combinations of AC with either SFO or LSO improved the performance, fatty and amino acid profiles, oxidative stability, and meat quality of broiler chickens.Highlights Supplying Amphora coffeaeformis (AC) to broiler sunflower (SFAC) or linseed oil (LSAC) diets improved performance. Dietary AC, 1 g/kg, improved the meat nutritional value of broilers fed SFAC or LSAC diets. Dietary AC, 1 g/kg, improved the meat oxidative stability of broilers fed SFAC or LSAC diets.
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- 2021
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23. Enhanced Antifouling in Flat-Sheet Polyphenylsulfone Membranes Incorporating Graphene Oxide–Tungsten Oxide for Ultrafiltration Applications
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Raghad M. Al-Maliki, Qusay F. Alsalhy, Sama Al-Jubouri, Adnan A. AbdulRazak, Mohammed Ahmed Shehab, Zoltán Németh, Klara Hernadi, and Hasan Sh. Majdi
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polyphenylsulfone ,polyvinylpyrrolidone ,graphene oxide ,tungsten oxide ,antifouling ,BSA removal ,Chemical technology ,TP1-1185 ,Chemical engineering ,TP155-156 - Abstract
In this study tungsten oxide and graphene oxide (GO-WO2.89) were successfully combined using the ultra-sonication method and embedded with polyphenylsulfone (PPSU) to prepare novel low-fouling membranes for ultrafiltration applications. The properties of the modified membranes and performance were investigated using Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), contact angle (CA), water permeation flux, and bovine serum albumin (BSA) rejection. It was found that the modified PPSU membrane fabricated from 0.1 wt.% of GO-WO2.89 possessed the best characteristics, with a 40.82° contact angle and 92.94% porosity. The permeation flux of the best membrane was the highest. The pure water permeation flux of the best membrane showcased 636.01 L·m−2·h−1 with 82.86% BSA rejection. Moreover, the membranes (MR-2 and MR-P2) manifested a higher flux recovery ratio (FRR %) of 92.66 and 87.06%, respectively, and were less prone to BSA solution fouling. The antibacterial performance of the GO-WO2.89 composite was very positive with three different concentrations, observed via the bacteria count method. These results significantly overtake those observed by neat PPSU membranes and offer a promising potential of GO-WO2.89 on activity membrane performance.
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- 2023
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24. Impact of dietary zinc oxide nanoparticles on selected serum biomarkers, lipid peroxidation and tissue gene expression of antioxidant enzymes and cytokines in Japanese quail
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Sabry Mohamed El-Bahr, Saad Shousha, Ibrahim Albokhadaim, Ahmed Shehab, Wassem Khattab, Omar Ahmed-Farid, Osama El-Garhy, Abdelrahman Abdelgawad, Mehrez El-Naggar, Mahmoud Moustafa, Omnia Badr, and Mohammad Shathele
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Japanese quails ,Zinc oxide nanoparticles ,Gene expression ,Antioxidants ,Veterinary medicine ,SF600-1100 - Abstract
Abstract Background The use of zinc oxide in the form of nanoparticles (ZnO-NPs) is of great benefit due to its potent effectiveness and higher bioavailability compared to zinc oxide. This study aimed to investigate the impact of dietary inclusion of different doses of ZnO-NPs on selected serum biomarkers, lipid peroxidation and tissue gene expression of antioxidant enzymes and cytokines in Japanese quail. Eighty Japanese quails (Coturnix japonica) (45 days old) were randomly divided into four groups (20 birds for each) with 4 replicates (5 birds each). Birds in the first group were fed a basal diet alone and served as a control (C). Birds in groups 2–4 were fed the basal diet supplemented with ZnO-NPs at doses of 15 mg/kg, 30 mg/kg and 60 mg/kg for a period of 60 days. At the end of the experiment, all birds were sacrificed to collect blood in a plain vacutainer, whereas liver and brain tissues were stored frozen at -80 °C. The obtained sera were used for the analysis of selected biochemical parameters, whereas tissue homogenates were used for the estimation of zinc, oxidative stress biomarkers and gene expression of selected antioxidant enzymes and cytokines. Results ZnO-NPs (30 and 60 mg/kg) induced a significant decrease in serum triacylglycerol (TAG) compared to the control. ZnO-NPs did not affect the activities of serum alanine aminotransferase (ALT), aspartate aminotransferase (AST), total protein, albumin, globulin and tissue zinc concentrations but reduced the malondialdehyde (MDA) levels compared to the control. The liver retained a higher zinc concentration than that of brain tissue. In a dose-dependent manner, ZnO-NPs upregulated the mRNA levels of antioxidant enzymes (superoxide dismutase: SOD1; catalase: CAT; glutathione peroxidase-1: GPX 1) and pro-inflammatory cytokines (interferon α: IFN-α; interleukin 6: IL-6) in liver and brain tissues. Conclusion The current study suggests the inclusion of ZnO-NPs, particularly 60 mg/kg, in the diet of Japanese quails to improve antioxidant and immune status.
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- 2020
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25. Consequences of twinning induction to Noemi ewes by a recombinant human follicle-stimulating hormone compared with pituitary-derived porcine follicle-stimulating hormone on follicular dynamics, maternal biochemical attributes, and neonatal traits
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Moustafa Mohamed Zeitoun, Abdulrahman O. El-Dawas, Mohamed A. Ateah, and Mohamed Ahmed Shehab El-Deen
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blood metabolites ,human follicle-stimulating hormone ,porcine follicle-stimulating hormone ,sheep ,twinning ,Animal culture ,SF1-1100 ,Veterinary medicine ,SF600-1100 - Abstract
Aim: The aim of this study was to investigate the effectiveness of using recombinant human follicle-stimulating hormone (FSH) compared with pituitary-derived porcine FSH given as one dose or multiple doses on the neonatal traits, follicular dynamics, and maternal blood biochemical constituents in Noemi ewes. Materials and Methods: A 3×2 factorial arrangement was designed utilizing 60 adults Noemi ewes to test the effects of using two sources of FSH (human vs. porcine) in addition to control, either given as a single total dose or six descending doses to provoke twinning. Six treatments (T) were tested (n=10 ewes/T). C1 and C6 served as control ewes given saline as one dose and six doses, respectively; H1 and H6 ewes were given human FSH as one and six doses; and P1 and P6 ewes were given porcine FSH similar to the above treatments. Saline and/or FSH administration were administered at days 8, 9, and 10 of the 10-day controlled internal drug release (CIDR) implant. At CIDR removal, fertile rams were used for natural mating. Blood samples for the assessment of serum metabolites were collected. Results: Twinning increased in FSH-treated ewes than control. However, giving FSH of either source as a single dose resulted in a higher incidence of stillbirths. Pregnancy rates were 30, 40, 50, 60, 70, and 80% in C1, C6, P1, P6, H1, and H6, respectively. Respective percent of ewes delivering twins/multiple birth was 0, 0, 80, 66.7, 71.4, and 87.5%. FSH of human source was more efficient for folliculogenesis than porcine FSH. Administration of FSH increased blood cholesterol, decreased high-density lipoprotein; however, low-density lipoprotein levels were not different than control. Moreover, an interaction (p
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- 2020
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26. Classification of Nanomaterials and the Effect of Graphene Oxide (GO) and Recently Developed Nanoparticles on the Ultrafiltration Membrane and Their Applications: A Review
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Raghad M. Al-Maliki, Qusay F. Alsalhy, Sama Al-Jubouri, Issam K. Salih, Adnan A. AbdulRazak, Mohammed Ahmed Shehab, Zoltán Németh, and Klara Hernadi
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mixed matrix membrane ,nanoparticles ,graphene oxide (GO) ,tungsten oxide (WOx) ,polyethersulfone (PES) ,polyphenylsulfone (PPSU) ,Chemical technology ,TP1-1185 ,Chemical engineering ,TP155-156 - Abstract
The emergence of mixed matrix membranes (MMMs) or nanocomposite membranes embedded with inorganic nanoparticles (NPs) has opened up a possibility for developing different polymeric membranes with improved physicochemical properties, mechanical properties and performance for resolving environmental and energy-effective water purification. This paper presents an overview of the effects of different hydrophilic nanomaterials, including mineral nanomaterials (e.g., silicon dioxide (SiO2) and zeolite), metals oxide (e.g., copper oxide (CuO), zirconium dioxide (ZrO2), zinc oxide (ZnO), antimony tin oxide (ATO), iron (III) oxide (Fe2O3) and tungsten oxide (WOX)), two-dimensional transition (e.g., MXene), metal–organic framework (MOFs), covalent organic frameworks (COFs) and carbon-based nanomaterials (such as carbon nanotubes and graphene oxide (GO)). The influence of these nanoparticles on the surface and structural changes in the membrane is thoroughly discussed, in addition to the performance efficiency and antifouling resistance of the developed membranes. Recently, GO has shown a considerable capacity in wastewater treatment. This is due to its nanometer-sized holes, ultrathin layer and light and sturdy nature. Therefore, we discuss the effect of the addition of hydrophilic GO in neat form or hyper with other nanoparticles on the properties of different polymeric membranes. A hybrid composite of various NPs has a distinctive style and high-quality products can be designed to allow membrane technology to grow and develop. Hybrid composite NPs could be used on a large scale in the future due to their superior mechanical qualities. A summary and future prospects are offered based on the current discoveries in the field of mixed matrix membranes. This review presents the current progress of mixed matrix membranes, the challenges that affect membrane performance and recent applications for wastewater treatment systems.
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- 2022
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27. Development and Investigation of Photoactive WO3 Nanowire-Based Hybrid Membranes
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Mohammed Ahmed Shehab, Nikita Sharma, Gábor Karacs, Lilla Nánai, István Kocserha, Klara Hernadi, and Zoltán Németh
- Subjects
hybrid membrane preparation ,electron microscopy ,photocatalysis ,organic dye decomposition ,Chemical technology ,TP1-1185 ,Chemistry ,QD1-999 - Abstract
Novel hybrid structures have attracted attention in several instances of scientific research and different technological applications in this decade due to their novel characteristics and wide range of applicability. Hybrid membranes with multiple components (three or more) are also increasingly used in water purification applications, and their ease of handling and reusability make them a promising candidate for the degradation of organic pollutants by photocatalysis. In this study, the preparation and characterization of tungsten trioxide nanowire (WO3 NW)-based hybrid membrane structures are reported. Furthermore, the adsorption properties and photocatalytic efficiency of the as-prepared membranes against methylene blue (MB) organic dye under UV irradiation is also presented. Characterization techniques, such as scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray powder diffraction (XRD) are performed to study the morphology and surface of the as-prepared hybrid membranes. The removal efficiency of the hybrid membranes against MB is 77% in a 120 min decomposition reaction. The enhanced value can be attributed to the hybrid structure of the membrane that enhances not only the adsorption capability, but also the photocatalytic performance. Based on the results obtained, it is hoped that hybrid membrane technology could be a promising candidate for future photocatalysis-based water treatment applications.
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- 2022
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28. Widespread applicability of bacterial cellulose-ZnO-MWCNT hybrid membranes
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Bilal El Mrabate, Emma Szőri-Dorogházi, Mohammed Ahmed Shehab, Tanya Chauhan, Gábor Muránszky, Emőke Sikora, Ádám Filep, Nikita Sharma, Lilla Nánai, Klara Hernadi, and Zoltán Németh
- Subjects
Hybrid membrane ,ZnO-MWCNT composites ,Micro CT ,Adsorption ,Photocatalysis ,Chemistry ,QD1-999 - Abstract
The novel photoactive membranes have grabbed the attention in the field of environmental protection by employing wastewater treatments and the removal of microorganisms or organic pollutants from wastewater. Here we present a promising self-supported photoactive hybrid membrane for future antimicrobial and water treatment applications. In this study, the efficiency of bacterial cellulose (BC) - zinc oxide (ZnO) - multi walled carbon nanotube (MWCNT) hybrid membranes in the adsorption and photocatalytic degradation of methylene blue (MB) under UV radiation and the removal of Escherichia coli (E. coli) was investigated. It was found that the photocatalytic efficiency is strongly dependent on both the preparation method and the amount of ZnO-MWCNT additives loaded into the hybrid membranes. The characterization of BC-ZnO-MWCNT membranes was done using scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP), and X-ray micro computed tomography (μCT) to study the morphological and porosity aspect of the prepared-membranes. The promising results of this study could provide a new pathway in the field of photocatalysed-based water treatment technology by the application of hybrid membranes.
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- 2021
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29. Numerical modeling of concentration polarization and inorganic fouling growth in the pressure-driven membrane filtration process
- Author
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Li, Wende, Su, Xu, Palazzolo, Alan, and Ahmed, Shehab
- Published
- 2019
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30. Preparation and Photocatalytic Performance of TiO2 Nanowire-Based Self-Supported Hybrid Membranes
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Mohammed Ahmed Shehab, Nikita Sharma, Andrea Valsesia, Gábor Karacs, Ferenc Kristály, Tamás Koós, Anett Katalin Leskó, Lilla Nánai, Klara Hernadi, and Zoltán Németh
- Subjects
self-supported membranes ,scanning electron microscopy ,photocatalysis ,organic dye decomposition ,Organic chemistry ,QD241-441 - Abstract
Nowadays, the use of hybrid structures and multi-component materials is gaining ground in the fields of environmental protection, water treatment and removal of organic pollutants. This study describes promising, cheap and photoactive self-supported hybrid membranes as a possible solution for wastewater treatment applications. In the course of this research work, the photocatalytic performance of titania nanowire (TiO2 NW)-based hybrid membranes in the adsorption and degradation of methylene blue (MB) under UV irradiation was investigated. Characterization techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), X-ray powder diffractometry (XRD) were used to study the morphology and surface of the as-prepared hybrid membranes. We tested the photocatalytic efficiency of the as-prepared membranes in decomposing methylene blue (MB) under UV light irradiation. The hybrid membranes achieved the removal of MB with a degradation efficiency of 90% in 60 min. The high efficiency can be attributed to the presence of binary components in the membrane that enhanced both the adsorption capability and the photocatalytic ability of the membranes. The results obtained suggest that multicomponent hybrid membranes could be promising candidates for future photocatalysis-based water treatment technologies that also take into account the principles of circular economy.
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- 2022
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31. A Senior Project-Based Multiphase Motor Drive System Development
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Abdel-Khalik, Ayman S., Massoud, Ahmed M., and Ahmed, Shehab
- Abstract
Adjustable-speed drives based on multiphase motors are of significant interest for safety-critical applications that necessitate wide fault-tolerant capabilities and high system reliability. Although multiphase machines are based on the same conceptual theory as three-phase machines, most undergraduate electrical machines and electric drives courses do not cover this topic. Setting aside the analysis challenges addressed in state-of-the-art literature, undergraduate electrical machines and power electronics courses are a good opportunity for students to understand the main concepts underlying such electric drive systems. This paper presents an adjustable-speed multiphase drive system senior project for electrical engineering undergraduate students that addresses their attainment of the course's learning outcomes. Eight of the course's students were assigned to build the multiphase variable-speed motor drive system. From a pedagogical point of view, this paper describes the methodology of using a senior project to engage students through experiential learning of electric drive systems, which span disciplines such as electrical machines, control, power electronics, and electronics. Students acquire both technical skills and soft skills, which are evaluated through various assessment activities. A number of lessons for future work have been drawn from the experience of applying this project-based learning approach.
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- 2016
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32. Orthodontic Bonding: Review of the Literature
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Ali H. Alzainal, Ahmed Shehab Majud, Abdulfatah M. Al-Ani, and Adil O. Mageet
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Dentistry ,RK1-715 - Abstract
Background. Patients seeking orthodontic treatment are increasing, and clinicians often have to place brackets on various surfaces aside from enamel. It is crucial to know what materials or instruments are required to bond brackets to each surface. Objective. This study aims to serve as a clinical guideline for the safest and most effective approaches taken to condition various surfaces for bonding to orthodontic brackets and provide background knowledge on the subject. Materials and Methods. PubMed and EBSCO databases were searched, along with the use of Google Scholar search engine, to obtain relevant articles published in English in peer-reviewed journals, from 1955 to 2020. Keywords used were Shear bond strength; Orthodontic bracket; Base design; Etching; Sandblasting; Laser; Conditioning; Enamel; Ceramic; Porcelain; Gold; Amalgam; Composite. Conclusion. Even though orthophosphoric acid is the most widely used enamel conditioning agent, laser etching should be considered to avoid enamel decalcification. Hydrofluoric acid is the current standard for ceramic conditioning; however, its use intraorally should be minimized due to its toxicity. Orthophosphoric acid, CoJet-Sand air abrasion, and laser etching are viable alternatives for conditioning ceramic. Monobond Etch & Prime is toxic and should not be used intraorally. Composite can be conditioned by bur roughening, and the use of ceramic brackets is recommended. Amalgam and gold surfaces can be conditioned adequately by air abrasion. Despite the claims of many authors, the maximum shear forces that orthodontic brackets are subjected to are not 6–8 mega pascal (MPa). Further investigation is required in that regard. More in vivo studies need to be performed to confirm the in vitro results.
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- 2020
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33. Discovery of novel root specific maize dolabralexin defenses: an expanding family of antibiotics
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Khalil, Ahmed Shehab
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Biology ,dolabralexins ,inducible ,maize secondary defense ,Phytoalexins ,secondary metabolism - Abstract
As the world’s largest annually harvested crop, optimization of maize (Zea mays) protective biochemical defenses that impede pest and pathogen attack will be essential to mitigate significant yield losses that could compromise our global food security. To better understand the diversity of pathogen elicited maize antibiotics, we leveraged a rapid sample preparation technique termed Vapour Phase Extraction (VPE) coupled with mass spectrometry (MS), high-performance liquid chromatography (HPLC) and Nuclear Magnetic Resonance (NMR) spectroscopy. We focused experiments on roots of field-grown maize lines discovered to produce high levels of terpenoid defenses. Leveraging the power of VPE, HPLC, and NMR, we found a series of novel modified dolabradiene derivatives, predictably part of the dolabralexin diterpenoid family of maize defenses. To generate endogenous evidence that the novel dolabralexins are products of diterpene synthases Anther ear 2 (ZmAn2) and Kaurene Synthase-Like 4 (ZmKSL4), we analyzed Zman2 and Zmksl4 mutants and demonstrated an absence of all dolabralexin-related metabolites. Chemical analyses of maize Biparental Recombinant Inbred Line (RIL) mapping population and an association panel coupled with global gene co-expression analyses using Mutual Ranks and Agrobacterium-mediated transient overexpression enzyme assays in Nicotiana benthamiana using different combinations of ZmAn2 and ZmKSL4 with cytochrome (CYP) P450 monooxygenases have revealed that ZmCYP71Z16 may contribute to the production of complex dolabralexin products.
- Published
- 2020
34. A Data-Driven Digital Twin of Electric Vehicle Li-Ion Battery State-of-Charge Estimation Enabled by Driving Behavior Application Programming Interfaces.
- Author
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Issa, Reda, Badr, Mohamed M., Shalash, Omar, Othman, Ali A., Hamdan, Eman, Hamad, Mostafa S., Abdel-Khalik, Ayman S., Ahmed, Shehab, and Imam, Sherif M.
- Subjects
ELECTRIC vehicle batteries ,DIGITAL twins ,MOTOR vehicle driving ,STANDARD deviations ,MICROSOFT Azure (Computing platform) ,ELECTRIC automobiles - Abstract
Accurately estimating the state-of-charge (SOC) of lithium-ion batteries (LIBs) in electric vehicles is a challenging task due to the complex dynamics of the battery and the varying operating conditions. To address this, this paper proposes the establishment of an Industrial Internet-of-Things (IIoT)-based digital twin (DT) through the Microsoft Azure services, incorporating components for data collection, time synchronization, processing, modeling, and decision visualization. Within this framework, the readily available measurements in the LIB module, including voltage, current, and operating temperature, are utilized, providing advanced information about the LIBs' SOC and facilitating accurate determination of the electric vehicle (EV) range. This proposed data-driven SOC-estimation-based DT framework was developed with a supervised voting ensemble regression machine learning (ML) approach using the Azure ML service. To facilitate a more comprehensive understanding of historical driving cycles and ensure the SOC-estimation-based DT framework is accurate, this study used three application programming interfaces (APIs), namely Google Directions API, Google Elevation API, and OpenWeatherMap API, to collect the data and information necessary for analyzing and interpreting historical driving patterns, for the reference EV model, which closely emulates the dynamics of a real-world battery electric vehicle (BEV). Notably, the findings demonstrate that the proposed strategy achieves a normalized root mean square error (NRMSE) of 1.1446 and 0.02385 through simulation and experimental studies, respectively. The study's results offer valuable insights that can inform further research on developing estimation and predictive maintenance systems for industrial applications. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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- View/download PDF
35. The Ideal Seeding Rate of Rice Cultivars Depending on Grain Yield.
- Author
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Al-Mashhadani, Ahmed Shehab, Al-Budeiri, Muntadher Hammadi, Al-Khazali, Ammar Jasim, Hassan, Saad Fleah, Kadhem, Ali Nadhem, and Harbi, Huda Hussien
- Published
- 2023
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- View/download PDF
36. Utilization BIM For Integrating Cost Estimation and Cost Control in Construction Projects
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Ahmed Shehab and Ahmed Mohamed Abdelalim
- Subjects
Cost integration - Abstract
Cost was adapted before using manual quantity surveying by spreadsheet that estimator take the quantity from the 2D drawing and input data manually. With emerging Building Information Modelling (BIM) in Architecture, Engineering, and Construction (AEC) industry. The concepts has changed then and BIM became essential ruler in all phases of construction. allows project participants to design, analyse BIM, sequence, and explore entire project model in contrast to CAD drawing, the object in BIM has also physical properties that drive object. Traditional cost methods have been discussed and then BIM tools to show how it saved a lot of expected errors and time along with third application have been introduced with an emphasis on construction cost estimating and its relation to cost control without skipping 4D of scheduling as important key in decreasing or increasing the cost. Two approaches for 4D scheduling in BIM. For the cost estimating capability, two available methods have been discussed: i) list from the BIM tool to the estimating software such as MS Excel, ii) link BIM components to estimating software, a case study is provided to demonstrates the cost estimating processes in BIM based on the BIM model of a three-story training facility. The integrated cost database that builds with the model is the main key factor for more accurate estimate and the purpose of this research is to improve the workflow of cost estimation and cost control make it as a base for other researcher to work based on. Keywords: Cost integration, BIM Cost estimation , Cost Data base , Worksets and Cost coding. Title: Utilization BIM For Integrating Cost Estimation and Cost Control in Construction Projects Author: Ahmed Shehab, Ahmed Mohamed Abdelalim International Journal of Management and Commerce Innovations ISSN 2348-7585 (Online) Vol. 11, Issue 1, April 2023 - September 2023 Page No: 102-120 Research Publish Journals Website: www.researchpublish.com Published Date: 11-May-2023 DOI: https://doi.org/10.5281/zenodo.7923308 Paper Download Link (Source) https://www.researchpublish.com/papers/utilization-bim-for-integrating-cost-estimation-and-cost-control-using-bim-in-construction-projects, International Journal of Management and Commerce Innovations, ISSN 2348-7585 (Online), Research Publish Journals, Website: www.researchpublish.com
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- 2023
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37. THE TWO WORDS OF RAISING AND PLACING IN THE QUR'AN KAREEM - AN ANALYTICAL STUDY
- Author
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Ahmed Shehab Ahmed and Ahmed Manaf Hassan
- Abstract
the definition of elevation in language and idiomatically, its occurrences, and related expressions in the Holy Qur’anThe first requirement: definition of lifting linguistically and idiomatically The second requirement: aspects of its occurrence in the Holy Qur’an The third requirement: related words The second topic : defining the situation in language and idiomatically, and its occurrences and related words in the Holy Qur’an The first requirement: definition of the situation linguistically and idiomatically The second requirement: aspects of its occurrence in the Holy Qur’an The third requirement: related words
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- 2023
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38. Transient force analysis and bubble dynamics during flow boiling in silicon nanowire microchannels
- Author
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Alam, Tamanna, Khan, Ahmed Shehab, Li, Wenming, Yang, Fanghao, Tong, Yan, Khan, Jamil, and Li, Chen
- Published
- 2016
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39. Enrichment of Broiler Chickens’ Meat with Dietary Linseed Oil and Lysine Mixtures: Influence on Nutritional Value, Carcass Characteristics and Oxidative Stress Biomarkers
- Author
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Sabry M. El-Bahr, Saad Shousha, Mohamed A. Alfattah, Saad Al-Sultan, Wasseem Khattab, Islam I. Sabeq, Omar Ahmed-Farid, Osama El-Garhy, Khalid A. Albusadah, Sameer Alhojaily, and Ahmed Shehab
- Subjects
functional food ,flaxseed ,meat quality ,antioxidants ,broilers ,Chemical technology ,TP1-1185 - Abstract
This study aimed to evaluate the effect of four combinations of dietary linseed oil and lysine mixtures on performance, fatty and amino acid profiles, oxidative stress biomarkers, cell energy and meat quality parameters of broiler chickens. One hundred and sixty broiler chicks were allocated into four groups. Birds of groups 1–4 were fed diets containing optimum lysine and 2% of linseed oil, optimum lysine and 4% of linseed oil, high lysine and 2% of linseed oil, and high lysine and 4% of linseed oil, respectively, for a period of 35 days. High linseed oil or lysine levels did not affect the performance of the tested birds, but the high level of dietary linseed oil decreased the concentrations of muscles’ saturated fatty acids (SFA). The highest values of ω-3 polyunsaturated fatty (ω-3 PUFA) and arachidonic acids with lowest levels of monounsaturated fatty (MUFA) were detected in the muscles of birds fed diets containing high linseed oils and/or lysine levels. High linseed oil or lysine levels provided the best essential amino acid profile and improved antioxidant components as well as cell energy, and tenderness and redness of the meat. Conclusively, high dietary lysine and linseed oil combinations improved the nutritional value, antioxidant status and cell energy of broiler chickens’ meat.
- Published
- 2021
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- View/download PDF
40. A Bi-Level Stochastic Game Model for PMU Placement in Power Grid with Cybersecurity Risks
- Author
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Ghosh, Saptarshi, Venkatraman, Murali Sankar, Ahmed, Shehab, and Konstantinou, Charalambos
- Subjects
FOS: Computer and information sciences ,Computer Science - Cryptography and Security ,FOS: Electrical engineering, electronic engineering, information engineering ,Systems and Control (eess.SY) ,Cryptography and Security (cs.CR) ,Electrical Engineering and Systems Science - Systems and Control - Abstract
Phasor measurement units (PMUs) provide accurate and high-fidelity measurements in order to monitor the state of the power grid and support various control and planning tasks. However, PMUs have a high installation cost prohibiting their massive deployment. Minimizing the number of installed PMUs needs to be achieved while also maintaining full observability of the network. At the same time, data integrity attacks on PMU measurements can cause mislead power system control and operation routines. In this paper, a bi-level stochastic non-cooperative game-based placement model is proposed for PMU allocation in the presence of cyber-attack risks. In the first level, the protection of individual PMU placed in a network is addressed, while considering the interaction between the grid operator and the attacker with respective resource constraints. In the second level, the attacker observes the placement of the PMUs and compromises them, with the aim of maximizing the state estimation error and reducing the observability of the network. The proposed technique is deployed in the IEEE-9 bus test system. The results demonstrate a 9% reduction in the cost incurred by the power grid operator for deploying PMUs while considering cyber-risks., 2023 IEEE Belgrade PowerTech
- Published
- 2023
41. Impact of Dietary Betaine and Metabolizable Energy Levels on Profiles of Proteins and Lipids, Bioenergetics, Peroxidation and Quality of Meat in Japanese Quail
- Author
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Sabry M. El-Bahr, Saad Shousha, Wasseem Khattab, Ahmed Shehab, Osama El-Garhy, Hoda El-Garhy, Shereen Mohamed, Omar Ahmed-Farid, Ahmed Hamad, and Islam Sabike
- Subjects
betaine ,Japanese quail ,energy ,lipids ,meat ,Veterinary medicine ,SF600-1100 ,Zoology ,QL1-991 - Abstract
Three different diets were formulated with three levels of metabolizable energy (ME) (optimum; 2900, restricted; 2800 and low; 2700 kcal ME/kg diet) without or with (0 and 0.15%) betaine supplementation in 2 × 3 factorial design to evaluate the effect of six experimental diets on performance, proteins and lipids profiles, bioenergetics, peroxidation and meat quality of Japanese quail. Therefore, 360 quails allocated into six groups in a 23-day experiment. Dietary betaine and ME levels did not affect the performance, meat energy indices (ATP and AMP) and malondialdehyde (MDA) levels of Japanese quail meat. Dietary betaine and/or ME levels induced significant changes in serum triacylglycerol (TAG), total cholesterols (TC), low-density lipoprotein cholesterol (LDL-c), very low-density lipoprotein cholesterol (VLDL-c), meat total lipids and cholesterol of Japanese quail. Optimum and restricted ME levels reduced total volatile basic nitrogen (TVBN) whereas dietary betaine increased ecosapentaenoic (EPA), docosahexaenoic acids (DHA) and glutamine concentrations in breast meat of Japanese quail. Dietary betaine and low energy diet improved cooking loss, thawing loss (ThL) and water holding capacity (WHC) in breast meat of Japanese quail. Conclusively, dietary betaine improved meat quality of Japanese quail fed diets containing either restricted or low ME by enrichments the meat with omega-3 fatty acids and reduction of lipids levels.
- Published
- 2021
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- View/download PDF
42. Modified Extended Complex Kalman Filter for DC Offset and Distortion Rejection in Grid-Tie Transformerless Converters.
- Author
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El-Nagar, Mohammed, Ahmed, Khaled, Hamdan, Eman, Abdel-Khalik, Ayman S., Hamad, Mostafa S., and Ahmed, Shehab
- Subjects
KALMAN filtering ,FREQUENCY stability ,PARAMETER estimation - Abstract
Proper operation of the grid-tie transformerless converters under unbalanced and distorted conditions entails a precise detection of the frequency and fundamental component of the grid voltage. One of the main problems that could arise during the estimation of grid parameters is the existence of a DC offset generated from measurement and A/D conversion. This undesirable induced DC offset could appear as a part of the reference sinusoidal current of grid-tie converters. Although literature has proposed the use of an extended complex Kalman filter (ECKF) for the estimation of positive and negative sequence voltage components as a promising competitor to phase locked loops, mitigating the effect of possible DC offsets when a Kalman filter is employed remains scarce. This paper proposes a new extended complex Kalman filter to improve the filter stability for estimating the frequency and the fundamental positive and negative symmetrical components of the grid voltages, where DC offset, scaling error, and noise can successfully be rejected. The theoretical findings are experimentally validated. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
43. Decentralized reinforce‐control of renewable dynamic virtual power plant enabling it to offer ancillary services: An attempt towards net‐zero targets.
- Author
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Kumar, Lalit, Ahmed, Shehab, Naidoo, Raj, and Bansal, Ramesh Chand
- Subjects
TEST systems ,INTERNAL auditing ,POWER plants ,FOSSIL fuel power plants - Abstract
This article presents internal model control (IMC) based decentralized reinforce‐control of renewable dynamic virtual power plant (DVPP) so that, it can be integrated into the power system as a substitution of fuel‐based conventional generators. Such grid integration towards net‐zero targets could not be possible without providing additional ancillary service (AS) to the power system, as the traditional AS would fall short with the retirement/substitution of conventional generators. The theory of DVPP from a technical perspective (i.e., TDVPP) is presented in a detailed and simplified manner, including the formulation of a generalized control objective (desired specification) for DVPP integration. The solution approach includes two steps: (1) disaggregation of desired specification and (2) decentralized reinforce‐control to match the disaggregated specification. The theory and solution approach for DVPP integration is presented in a generalized manner enabling the DVPP to offer multiple ASs, but the case study is limited only to frequency control AS (FCAS) in this article. The study is performed on the 'western system coordinating council (WSCC)' test system, in which an attempt is made towards net‐zero targets by substituting the largest thermal generator with renewable DVPP ensuring the grid's operation or dynamics safe. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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44. Is scoring system of computed tomography based metric parameters can accurately predicts shock wave lithotripsy stone-free rates and aid in the development of treatment strategies?
- Author
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Yasser ALI Badran, Alsayed Saad Abdelaziz, Mohamed Ahmed Shehab, Hazem Abdelsabour Dief Mohamed, Absel-Aziz Ali Emara, Ali Mohamed Ali Elnabtity, Maged Mohammed Ghanem, and Hesham Abdel Azim ELHelaly
- Subjects
Hounsfield units, stone, upper urinary tract ,Diseases of the genitourinary system. Urology ,RC870-923 - Abstract
Objective: The objective was to determine the predicting success of shock wave lithotripsy (SWL) using a combination of computed tomography based metric parameters to improve the treatment plan. Patients and Methods: Consecutive 180 patients with symptomatic upper urinary tract calculi 20 mm or less were enrolled in our study underwent extracorporeal SWL were divided into two main groups, according to the stone size, Group A (92 patients with stone ≤10 mm) and Group B (88 patients with stone >10 mm). Both groups were evaluated, according to the skin to stone distance (SSD) and Hounsfield units (≤500, 500–1000 and >1000 HU). Results: Both groups were comparable in baseline data and stone characteristics. About 92.3% of Group A rendered stone-free, whereas 77.2% were stone-free in Group B (P = 0.001). Furthermore, in both group SWL success rates was a significantly higher for stones with lower attenuation 830 HU (P < 0.034). SSD were statistically differences in SWL outcome (P < 0.02). Simultaneous consideration of three parameters stone size, stone attenuation value, and SSD; we found that stone-free rate (SFR) was 100% for stone attenuation value 10 mm but total number SWL sessions and shock waves required for the larger stone group were higher than in the smaller group (P < 0.01). Furthermore, SFR was 83.3% and 37.5% for stone 830, SSD 90 mm and SSD >120 mm, respectively. On the other hand, SFR was 52.6% and 28.57% for stone >10 mm, mean HU >830, SSD 120 mm, respectively. Conclusion: Stone size, stone density (HU), and SSD is simple to calculate and can be reported by radiologists to applying combined score help to augment predictive power of SWL, reduce cost, and improving of treatment strategies.
- Published
- 2016
- Full Text
- View/download PDF
45. State-of-the-art multi-phase windings types
- Author
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Ayman Samy, Abdel-Khalik, Metwly, Mohamed Y., Massoud, Ahmed, and Ahmed, Shehab
- Subjects
Multi-phase induction machine ,High-power machines ,Fault-tolerant operation - Abstract
Multiphase machines have attracted significant attention in academic and industrial sectors as candidates for high-power safety-critical applications and wind energy conversion systems. Premierly, this chapter introduces the state-of-the-art in multiphase machine winding topologies. This typically considers the winding layouts employed in multiphase induction machines with prime phase and multiple three-phase orders. This chapter also provides some recent winding topologies that offer better machine characteristics in terms of torque density, efficiency, and fault-tolerance capability. One of the major problems when dealing with a prime number of phases, either in academic research or industrial applications, is the special stator design. Thus, a general technique to rewind standard off-the-shelf three-phase stator frames with any general prime phase order is introduced while preserving the same copper volume. © 2022 by Nova Science Publishers, Inc. All rights reserved.
- Published
- 2022
46. Effect of Dietary Microalgae on Growth Performance, Profiles of Amino and Fatty Acids, Antioxidant Status, and Meat Quality of Broiler Chickens
- Author
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Sabry El-Bahr, Saad Shousha, Ahmed Shehab, Wassem Khattab, Omar Ahmed-Farid, Islam Sabike, Osama El-Garhy, Ibrahim Albokhadaim, and Khaled Albosadah
- Subjects
Chlorella vulgaris ,Spirulina platensis ,Amphora coffeaformis ,meat quality ,biomarkers ,Veterinary medicine ,SF600-1100 ,Zoology ,QL1-991 - Abstract
The study used 96 broiler chickens to evaluate the impact of three species of microalgae on performance, profiles of fatty and amino acids, antioxidants, and meat quality of breast muscles. Birds were divided into four groups (24 birds/each) with 4 replicates (6 birds each). Birds in the first group were fed basal diet and served as a control (C). Birds of 2–4 groups were fed basal diet mixed with same dose (1 g/kg diet) of Chlorella vulgaris (CV), Spirulina platensis (SP), and Amphora coffeaformis (AC). At the age of 36 days, performance parameters were reported, and breast muscle samples were collected and stored frozen at −80 °C. AC shared CV in the superiority of increasing final body weight and body weight gain compared to SP and control. AC shared SP in the superiority of increasing the level of essential fatty and amino acids and decreasing the microbial growth in breast muscle compared to CV and control. All studied microalgae reduced malondialdehyde (MDA) and protein carbonyl (PC) levels, cooking loss, and aerobic plate count (APC) and increased the superoxide dismutase (SOD) activities in breast muscle compared to control. The current study indicated that studied microalgae, notably AC, can be used to enhance performance and meat quality in broilers chickens.
- Published
- 2020
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47. Design and Finite-Element-Based Optimization for a 12-Slot/10-Pole IPM Motor with Integrated Onboard Battery Charger for Electric Vehicle Applications.
- Author
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Abdel-Wahed, Ahmed T., Ullah, Zia, Abdel-Khalik, Ayman S., Hamad, Mostafa S., Ahmed, Shehab, and Elmalhy, Noha A.
- Subjects
ELECTRIC vehicle charging stations ,BATTERY chargers ,ELECTRIC vehicle batteries ,PERMANENT magnets ,GENETIC techniques ,GENETIC algorithms - Abstract
Permanent magnet (PM) machines with fractional slot concentrated windings (FSCW) constitute a notably remarkable proposition for electric vehicles. Additionally, an integrated onboard battery charger (IOBC) provides another superiority as it exploits the components of the powertrain to charge the battery without any additional components. Interior permanent magnet (IPM) motor arises as a credible choice due to its high torque density, resulting from the high saliency ratio. The optimal design of an IPM motor has been extensively presented from different perspectives, but the optimal design of a motor employed for IOBC application for both propulsion and charging modes has not been studied extensively. In this paper, the design and optimization of a 12-slot/10-pole IPM motor with IOBC are studied under both propulsion and charging modes. A finite-element-based optimization with the aid of a genetic algorithm technique is proposed to obtain the optimal machine by maximizing the average torque and minimizing the torque ripple, core losses, and magnet size. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
48. Influence of dietary combinations of Amphora coffeaeformis with linseed oil or sunflower oil on performance, fatty and amino acid profiles, oxidative stability and meat quality of broiler chickens
- Author
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Saad I. Al-Sultan, Sabry M. El-Bahr, Omar A. Ahmed-Farid, Mohammed A. Alfattah, Ahmed Shehab, Sameer Alhojaily, Wasseem Khattab, Saad Shousha, Osama H. El-Garhy, Islam I. Sabeq, and Khalid A. Al-Busadah
- Subjects
chemistry.chemical_classification ,food.ingredient ,Sunflower oil ,microalgae ,Broiler ,food and beverages ,biomarkers ,Oxidative phosphorylation ,SF1-1100 ,Amino acid ,meat quality ,Animal culture ,food ,antioxidants ,chemistry ,Linseed oil ,chickens ,Animal Science and Zoology ,Food science ,Amphora coffeaeformis - Abstract
This study aimed to evaluate the effect of dietary linseed oil, sunflower oil, and their supplementation with Amphora coffeaeformis (AC) on growth performance, carcase characteristics, fatty and amino acid profiles, oxidative stability, and meat quality of broiler chickens. One hundred and eighty day-old broiler chicks were divided into four groups (five replicates per group, 9 birds per each replicate pen). Birds in groups 1, 2, 3, and 4 fed diets containing 3% sunflower oil without AC (SFO 3%), 3% SFO with 1 g/kg diet of AC (SFAC), 3% linseed oil without AC (LSO 3%) and 3% LSO oil with 1 g/kg diet of AC (LSAC), respectively for 32 days. Final weight and weight gain were increased whereas fat pads were decreased in birds fed diets containing SFAC or LSAC compared to other groups. The values of omega-3 fatty acids, essential amino acids, and antioxidants were increased while saturated fatty acids (SFA) declined in the meat of birds fed diets supplemented with AC (SFAC & LSAC) compared to other groups. Lysine levels in the meat of birds fed AC and/or linseed diets were inversely related to hepatic L-carnitine levels. Breast meats of different broiler groups did not differ significantly in quality traits. However, broilers fed AC-containing diets had relatively lower yellowness, redness, and Chroma values. Conclusively, dietary combinations of AC with either SFO or LSO improved the performance, fatty and amino acid profiles, oxidative stability, and meat quality of broiler chickens.Highlights Supplying Amphora coffeaeformis (AC) to broiler sunflower (SFAC) or linseed oil (LSAC) diets improved performance. Dietary AC, 1 g/kg, improved the meat nutritional value of broilers fed SFAC or LSAC diets. Dietary AC, 1 g/kg, improved the meat oxidative stability of broilers fed SFAC or LSAC diets.
- Published
- 2021
49. Succinylated lysine residue prediction revisited.
- Author
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Ahmed, Shehab Sarar, Rifat, Zaara Tasnim, Rahman, M Saifur, and Rahman, M Sohel
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- *
POST-translational modification , *NEUROLOGICAL disorders , *LYSINE , *AMINO acids , *DEEP learning - Abstract
Lysine succinylation is a kind of post-translational modification (PTM) that plays a crucial role in regulating the cellular processes. Aberrant succinylation may cause inflammation, cancers, metabolism diseases and nervous system diseases. The experimental methods to detect succinylation sites are time-consuming and costly. This thus calls for computational models with high efficacy, and attention has been given in the literature to develop such models, albeit with only moderate success in the context of different evaluation metrics. One crucial aspect in this context is the biochemical and physicochemical properties of amino acids, which appear to be useful as features for such computational predictors. However, some of the existing computational models did not use the biochemical and physicochemical properties of amino acids. In contrast, some others used them without considering the inter-dependency among the properties. The combinations of biochemical and physicochemical properties derived through our optimization process achieve better results than the results achieved by combining all the properties. We propose three deep learning architectures: CNN+Bi-LSTM (CBL), Bi-LSTM+CNN (BLC) and their combination (CBL_BLC). We find that CBL_BLC outperforms the other two. Ensembling of different models successfully improves the results. Notably, tuning the threshold of the ensemble classifiers further improves the results. Upon comparing our work with other existing works on two datasets, we successfully achieve better sensitivity and specificity by varying the threshold value. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
50. Symmetrical Nine-Phase Drives with a Single Neutral-Point: Common-Mode Voltage Analysis and Reduction.
- Author
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Dabour, Sherif M., Aboushady, Ahmed A., Elgenedy, Mohamed A., Gowaid, I. A., Farrag, Mohamed Emad, Abdel-Khalik, Ayman S., Massoud, Ahmed M., and Ahmed, Shehab
- Subjects
PULSE width modulation transformers ,INDUCTION motors ,PULSE width modulation ,ELECTRIC suspension ,ELECTRIC windings ,ELECTRIC insulators & insulation ,ELECTRIC machines - Abstract
Power converters generate switching common mode voltage (CMV) through the pulse width modulation (PWM). Several problems occur in the drive systems due to the generated CMV. These problems can be dangerous to the insulation and bearings of the electric machine windings. In recent years, many modulation methods have been developed to reduce the CMV in multiphase machines. Symmetrical nine-phase machines with single-neutral are considered in this paper. In this case, conventional PWM uses eight active vectors of different magnitudes in combination with two zero states in a switching cycle, and this generates maximum CMV. This paper proposes two PWM schemes to reduce the CMV in such a system. The first scheme is called active zero state (AZS). It replaces the zero vectors with suitable opposite active vectors. The second scheme uses ten large active vectors during switching and is called SVM-10L. Compared with conventional strategies, the AZS reduces the peak CMV by 22.2%, and the SVM-10L reduces the peak CMV by 88.8%. Moreover, this paper presents a carrier-based implementation of the proposed schemes to simplify the implementation. The proposed schemes are assessed using simulations and experimental studies for an induction motor load under different case studies. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
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