A5011090692- High voltage insulation and dielectric phenomena
- Power Transformer Diagnostics and Insulation
- Lightning and Electromagnetic Phenomena
- Minerals Flotation and Separation Techniques
- Thermal Analysis in Power Transmission
- Planetary Science and Exploration
- Mineral Processing and Grinding
- Dielectric materials and actuators
- Light effects on plants
- Boron and Carbon Nanomaterials Research
- Geotechnical Engineering and Soil Stabilization
- Clay minerals and soil interactions
- Graphene research and applications
- Polar Research and Ecology
- Recycling and utilization of industrial and municipal waste in materials production
- Aerosol Filtration and Electrostatic Precipitation
- Origins and Evolution of Life
- Combustion and flame dynamics
- Coal Combustion and Slurry Processing
- SARS-CoV-2 detection and testing
- Advancements in Battery Materials
- Iron and Steelmaking Processes
- Materials Engineering and Processing
- Photosynthetic Processes and Mechanisms
- Nonlinear Optical Materials Research
Harvard University
2023-2024
Helwan University
2011-2023
Cairo University
2023
Harvard University Press
2023
Central Metallurgical Research and Development Institute
1999-2020
What constitutes a habitable planet is frontier to be explored and requires pushing the boundaries of our terracentric viewpoint for what we deem environment. Despite Venus' 700 K surface temperature being too hot any plausible solvent most organic covalent chemistry, cloud-filled atmosphere layers at 48 60 km above hold main requirements life: suitable temperatures bonds; an energy source (sunlight); liquid solvent. Yet, Venus clouds are widely thought incapable supporting life because...
Graphene (GN) nanosheets have been widely exploited in biomedical applications as potential nanocarriers for various drugs due to their distinct physical and chemical properties. In this regard, the adsorption behavior of cisplatin (cisPtCl2) some its analogs on a GN nanosheet was investigated perpendicular parallel configurations by using density functional theory (DFT). According findings, most significant negative energies (Eads) within cisPtX2⋯GN complexes (where X = Cl, Br, I) were...
Adsorption amplitude of the aluminum phosphide (Al12P12) nanocage toward 2-Mercaptopyridine (MCP) drug was herein monitored based on density functional theory (DFT) calculations. The adsorption process through MCP⋅⋅⋅Al12P12 complex in various configurations elucidated by means (Eads) energies. According to energetic affirmations, Al12P12 demonstrated potential versatility adsorbing MCP within investigated and exhibited significant negative energies up -27.71 kcal/mol. Upon results SAPT...
We show that the nucleic acid bases adenine, cytosine, guanine, thymine, and uracil, as well 2,6-diaminopurine, “core” purine pyrimidine, are stable for more than one year in concentrated sulfuric at room temperature concentrations relevant Venus clouds (81% w/w to 98% acid, rest water). This work builds on our initial stability studies is first ever test reactivity structural integrity of organic molecules subjected extended incubation acid. The one-year-long supports notion cloud...
To test the hypothesis that an abiotic Earth and its inert atmosphere could form chemically reactive carbon- nitrogen-containing compounds, we designed a plasma electrochemical setup to mimic lightning-induced electrochemistry under steady-state conditions of early Earth. Air-gap reactions at air-water-ground interfaces lead remarkable yields, with up 40 moles carbon dioxide being reduced into monoxide formic acid, 3 gaseous nitrogen fixed nitrate, nitrite, ammonium ions, per mole...
This paper presents the simulation results of electric field distribution for optimally designed medium voltage composite insulators under polluted conditions with and without water droplets. Four different profiles 11 kV were used. Simulation was executed both typical optimized by using Comsol Multiphysics program. The main objective this investigating effect pollution droplets on insulators. layer thickness conductivity studied. showed that maximum stresses less than those typically in...
The detection of pharmaceutical compounds in extremely low concentrations remains a challenge despite recent advancements electrochemical sensing. In this study, green hydrothermally synthesized nickel hydroxide-graphene hybrid material was used for the point-of-care determination antibiotic doxycycline (DOXY), which is promising treatment COVID-19 and other infections. sensor, based on screen-printed electrode modified with material, able to detect DOXY range 5.1 × 10-8 1.0 10-4 M, limit...
The charge simulation method (CSM), owing to its favourable characteristics, is commonly used for electric field analysis of high-voltage insulation systems. In order improve the precision calculation and minimise reliance on personal experience, a novel combination particle swarm optimisation (PSO) CSM proposed. this, optimum allocations simulating charges can be obtained using PSO. conventional briefly considered optimised version formulated. potential distribution between two spherical...
The configuration of grounding grids which are used to earth electrical substations could be equally or unequally spaced. Unequally spaced were introduced improve the requirements such as grid resistance (Rg), ground potential rise (GPR), maximum touch voltage (Et) and step (Es) values. Also, unequal spacing can reduce cost enhance level safety for people equipments. In this paper two different approaches determine best possible grid. These based on sequential multiplicative power techniques.
The potentiality of the β12 borophene (β12) and pristine graphene (GN) nanosheets to adsorb tetrahalomethanes (CX4; X = F, Cl, Br) were investigated using density functional theory (DFT) methods. To provide a thorough understanding adsorption process, tetrel (XC-X3∙∙∙β12/GN)- halogen (X3C-X∙∙∙β12/GN)-oriented configurations characterized at various sites. According energetic manifestations, process CX4∙∙∙β12/GN complexes within tetrel-oriented configuration led more desirable negative energy...
The efficiency of 6-mercaptopurine and 6-thioguanine expired drugs as corrosion inhibitors aluminium surface was thoroughly assessed using DFT method.
Electric field intensity can be determined analytically, experimentally and numerically. Charge simulation method (CSM) is one of the most commonly used numerical methods for its many characteristics features. It stand alone or in combination with other methods. Sometimes optimisation techniques are to facilitate locating simulating charges as well their values. Several have emerged past decades that mimic biological evolution. The representative include genetic algorithms (GA) particle...
AbstractAlbite (sodium feldspar) is widely used in glass and ceramic industries. The presence of colouring materials such as titanium dioxide iron oxide reduces the quality feldspar. To use albite feldspar fine high glass, should be removed. This work aims to remove by using both dry magnetic separation flotation techniques. experimental programme involves crushing, grinding, sieving, indirect materials. grinding was prepare different sizes varied from 100 500 µm for flotation. parameters...
In this paper, a new technique for the analysis of an earthing system is presented. The depends on determination electric-field intensity around and distribution current injected into soil. line integral used to calculate resistance. calculated by charge simulation method, where locations simulating charges are optimized using particle swarm optimization technique. proposed applicable simple as well complex systems. Uniform soil multilayer can be accommodated. procedure provides accurate...
One of the weakest paths for electrical discharge in power transformers is oil/pressboard interface. So, this study it aimed to enhance flashover resistance such interface through using concept nanofluids. Nanofluid impregnated pressboard were prepared two different types nanoparticles. These are Alumina (Al2O3) and Titania (TiO2) which have values zeta (ζ) potential that had been experimentally measured. Flashover tests carried out at with nanofluids mineral oil. Three conditions oil flow...
The Ghorabi iron ore is composed mainly of goethite, hematite and quartz minerals. Chemically, four-fifths the (80·65%) are oxides (44·10%, 34·30%Fe) silica (36·81%). size distribution indicates that concentrated in fine fraction (>38% −53 μm) while coarse (>40% +53 μm). Conditioning with sodium silicate increases therefore reduces (−53 μm), attritioning fines from 24 to 40·78% 38·64 46·20% fraction. In present study beneficiation conducted by screening, attritioning, classification magnetic...
AbstractAbstractThe present paper focuses on obtaining concentrates enriched with organic matter that could be suitable for a retorting process from two different types of black shales; these are oil shale the Safaga area Red Sea Coast, and carbonaceous Abu-Zenima area, west Central Sinai. X-ray diffraction optical polarising microscope used in evaluating minerals. Attrition scrubbing, hydrocyclone separation, jigging flotation were conducted enrichment samples. Mineralogical studies...
Dielectric materials in their different types are an essential part of a power system. These always work under high electric stress which leads to deterioration at long run. Therefore, partial discharge (PD), is consequent stress, important tool for evaluating the voltage insulation systems. In this paper, properties void discharges within dielectric sinusoidal AC frequency were investigated experimentally and through modelling. The test object consists cylindrical with dimensions positions...
It is well known that the presence of a void affects performance insulating material and its life time. The properties partial discharge (PD) occurring at inside solid are effected by conditions, mainly dimension, position, temperature gas pressure, which determine electric field distributions within site in turn influence discharge. In this paper, PD interest were inception field, maximum apparent charge repetition rate. Composite traditional materials like Silicon Rubber, Ethylene...
Abstract This work presents an experimental study that aims at investigating the effect of loading ratio coal in a coal-diesel fuel mixture on combustion characteristics and exhaust emissions. Sub-bituminous from El-Maghara mine is utilized. It washed, dried, grounded to particle sizing ≤ 30 μm. The experiments are conducted inside horizontal, segmented water-cooled cylindrical furnace fitted with coaxial burner having central air-assisted atomizer for oil-coal admittance. All executed...
Electrical discharge on pressboard surface is one of the major failure mechanisms in power transformer. This study aims to analyze effect nanofluid electrical at material used transformers under AC application. A needle plane configuration with constant gap length was implemented pressboard. First, value and polarity applied voltage during measured base transformer oil. Then, alumina nanoparticles were added different weight fractions. The behavior nanofluids obtained compared that Discharge...
AbstractGlauconite has been a concern for different fields ranging from agriculture to heavy metal removal and wastewater treatment. For each application, glauconite must fulfill certain specifications. The most important parameter, acting as the controlling factor, in almost all relevant industries, is particle size. Therefore, present work, several techniques were used obtain suitable size distribution of order meet standard specification water treatment fertiliser. Dry crushing ore,...
The safety of personnel and satisfied performance power system is the main purpose grounding system. This could be achieved by well-designed grid Therefore a lot work has been carried out in this field for investigating obtaining best design. Majority were done minimizing cost. On other hand some previous optimizing characteristics using simple approaches as well optimization techniques. In paper particle swarm technique adapted to find optimum parameters grids combined integration/matrix...