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Wastewater degradation by iron/copper nanoparticles and the microorganism growth rate

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Journal of environmental Sciences 2018年第12期30卷 19-31页

作者： Tareq W.m.Amen Osama eljamal ahmed m.e.Khalil nobuhiro matsunaga earth System Science and Technology Interdisciplinary Graduate School of Engineering Sciences Kyushu University Department of Chemical engineering Faculty of Engineering Cairo University

nowadays, trends in wastewater treatment by zero-valent iron（ZVI） were turned to use bimetallic nZVI particles by planting another metal onto the ZVI surface to increase its reactivity. nano size zero-valent iron/copper（nZVI/Cu0） bimetallic particles were synthesized in order to examine its toxicity effects on the wastewater microbial life, kinetics of phosphorus, ammonia stripping and the reduction of chemical oxygen demand（COD）.Various concentrations of nZVI/Cu0 and operation conditions both aerobic and anaerobic were investigated and compared with pure nZVI experiment. The results showed that addition10 mg/L of nZVI/Cu0 significantly increased the num.ers of bacteria colonies under anaerobic condition, conversely it inhibited bacteria activity with the presence of oxygen. Furthermore,the impact of nanoparticles on ammonia stripping and phosphorus removal was also linked to the emitted iron ions electrons. It was found that dosing high concentration of bimetallic nZVI/Cu0 has a negative effect on ammonia stripping regardless of the aeration condition. In comparison to control, dosing only 10 mg/L nZVI/Cu0, the phosphorus removal increased sharply both under aerobic and anaerobic conditions, these outcomes were obtained as a result of complete dissolution of bimetallic nanoparticles which formed copper-iron oxides components that are attributed to increasing the phosphorus adsorption rate.

关键词： Iron bimetallic Wastewater biodegradation Bacterial life Contaminants removal

effect of Pd or Ir on the catalytic performance of mo/h-ZSm-5 during the non-oxidative conversion of natural gas to petrochemicals

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Journal of natural Gas Chemistry 2008年第4期17卷 337-343页

作者： ahmed K.Aboul-Gheit ahmed e.Awadallah Salah m.el-Kossy Abdel-Lateef h.mahmoud Process Development Division Egyptian Petroleum Research Institute Faculty of Science Department of ChemistryMNF University Ageeba Petroleum Co.

natural gas conversion to petrochemicals, principally, benzene, naphthalene, toluene, as well as ethylene under non-oxidative conditions was examined in a fixed bed flow reactor at 700 ℃ and gaseous hourly space velocity （GhSV） of 1500 ml·g ^-1·h^-1 at time-on-stream ranging from 5 rain to 4 h using catalysts containing 6.0%mo/h-ZSm-5 promoted with Pd or Ir metal. The catalysts were characterized by XRD, TPD, and TGA. The addition of Pd or Ir to 6%mo/h-ZSm-5 catalyst promoted ethylene production but inhibited the cyclization reaction to aromatics owing to the strong interaction between these noble metals and the framework Al species, which were attached to the acid sites during the impregnation process. Coke deposition on the catalysts was found to decrease upon addition of 0.5wt% of Pd or Ir to 6%mo/h-ZSm-5 catalyst owing to the hydrogenating activity of these metals.

关键词： natural gas methane benzene ethylene molybdenum Pd Ir h-ZSm-5

La^3+ doped LiCo0.25Zn0.25Fe2O4 spinel ferrite nanocrystals:Insights on structural,optical and magnetic properties

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Journal of Rare earths 2021年第1期39卷 75-82,I0003页

作者： m.I.A.Abdel maksoud ahmed el-Ghandour A.h.Ashour m.m.Atta Soraya Abdelhaleem ahmed h.el-hanbaly Ramy Amer Fahim Said m.Kassem m.S.Shalaby A.S.Awed materials Science Lab. Radiation Physics DepartmentNational Center for Radiation Research and Technology(NCRRT)Atomic Energy AuthorityCairoEgypt Center Photonics and Smart materials(CPSm) Zewail City of Science and TechnologyOctober Gardens6th of October CityGizaEgypt Polymers Physics Lab. Radiation Physics DepartmentNational Center for Radiation Research and Technology(NCRRT)Atomic Energy AuthorityCairoEgypt egyptian nuclear and Radiological Regulatory Authority CairoEgypt Radiation Protection and Dosimetry Department National Center for Radiation Research and Technology(NCRRT)Atomic Energy AuthorityCairoEgypt magnetic and Thermal Lab Solid State&Accelerators DepartmentNational Center for Radiation Research and TechnologyAtomic Energy AuthorityNasr CityCairoEgypt higher Institute for engineering and Technology ManzalaDakahliaEgypt

This paper addresses the manipulation of structural,morphology,optical and magnetic properties of LiCo0.25Zn0.25Fe2 O4 ferrite via incorporation of different proportions of La^3+at the expense of iron ions using a sol-gel *** samples were characterized using the X-ray diffraction technique(XRD),Fourier transform infrared(FT-IR)spectroscopy,the energy dispersive X-ray spectra(eDX),inductively coupled plasma optical emission spectroscopy(ICP-OeS),high resolution scanning electron microscopy(Sem),Brunauer-em.ett-Teller(BeT)surface area analysis,ultraviolet-diffuse reflectance spectroscopy(UV-DRS),and vibrating sample magnetometer(VSm)*** Rietveld refinements of the samples indicate that at higher concentrations of La^3+,nanostructures with dual phase,*** spinel and orthorhombic LaFeO3 perovskite with space group(Pbnm)*** studies show that the energy band gap(eg)of the bare LiCo0.25Zn0.25Fe2 O4 ferrite sample(2.18 eV)reaches up to 2.47 eV at x=0.06 and above this concentration,it drops sharply to 2.00 *** the saturation magnetization and the coercivity of LiCo0.25Zn0.25LaxFe2-xO4 are lower than that of LiCo0.25Zn0.25Fe2 O4 ***,the superparamagnetic nature and low values of saturation magnetization and coercivity of LiCo0.25Zn0.25LaxFe2-xO4 nPs are suitable to be applied in transformers core.

关键词： Li-Co-Zn ferrite Superparamagnetic nature Optical properties magnetic behavior Transformers core Rare earths

high Gain Predictions for ni-Like Ta Ions

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Chinese Physics Letters 2013年第11期30卷 80-83页

作者： Wessameldin S.Abdelaziz A.A.Farrag h.m.hamed mai e.ahmed national Institute of Laser enhanced Sciences Cairo UniversityGizaEgypt Faculty of Science Cairo UniversityGizaEgypt environmental Affairs Agency(eeAA) Egypt

Atomic structure data and effective collision strengths for 1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10) and 54 fine-structure levels are contained in the configurations 1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(9)4l(l=s,p,d,f)for the nickel-like Ta *** data are used in the determination of the reduced population for the 55 fine structure levels over a wide range of electron densities(from 10^(21) to 10^(23))and at various electron plasma *** gain coefficients for those transitions with a positive population inversion factor are determined and plotted against the electron density.

关键词： density nickel structure

Catalytic performance of nano-hybrid graphene and titanium dioxide modified cathodes fabricated with facile and green technique in microbial fuel cell

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Progress in natural Science:materials International 2017年第6期27卷 647-651页

作者： m.mashkour m.Rahim.ejad S.m.Pourali h.ezoji ahmed elmekawy Deepak Pant Biofuel and Renewable energy Research Center Department of Chemical Engineering Babol Noshirvani University of Technology Genetic engineering and Biotechnology Research Institute University of Sadat City (USC) School of Chemical engineering The University of Adelaide Separation and Conversion Technologies Flemish Institute for Technological Research (VITO)

Finite resources of the world’s fossil fuel give rise to the irresistible urge to explore alternative renewable energy routes such as microbial fuel cells（mFCs）. The limited productivity is one of the main obstacles for mFC scalability. In this study, a dual-cham.er mFC was assembled and equipped with fabricated modified cathodes with titanium dioxide（TiO;） or hybrid graphene（hG） which mainly improved the catalytic activity of the *** graphite paste（GP） bare electrode was modified by both nanomaterials using a green and facile *** results showed that the modified cathodes resulted in a considerable improvement for the mFC performance,i.e., the power density reaching levels of 80 mW/m;for GP-TiO;and 220 mW/m;for GP-hG compared to 30 mW/m;for GP electrode. Additionally, the modified electrodes exhibited lower charge transfer resistance(R;) compared to the bare electrode. Therefore, these modified electrodes, fabricated by an eco-friendly method,could be used as alternatives to the precious expensive metals like Pt.

关键词： microbial fuel cell Cathode Graphite paste Titanium dioxide Graphene oxide Power density

Voltage imbalance mitigation in an active distribution network using decentralized current control

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Protection and Control of modern Power Systems 2023年第2期8卷 68-84页

作者： ahmed m.m.nour ahmed A.helal magdi m.el-Saadawi ahmed Y.hatata Alexandria higher Institute of engineering and Technology(AIeT) AlexandriaEgypt Department of electrical and Control engineering Arab Academy for Science and Technology and Maritime TransportAlexandriaEgypt Department of electrical engineering Faculty of EngineeringMansoura UniversityMansouraEgypt Department of electrical engineering College of EngineeringShaqra UniversityShaqraKingdom of Saudi Arabia

Voltage imbalance(VI)is caused by the difference in connected single-phase load or generation in a low voltage distribution network(Dn).VI increase in a smart distribution grid is due to the current practice of increasing single-phase distributed generators such as photovoltaic(PV)*** paper proposes a decentralized control method to mitigate VI using distributed batteries included in smart grid interfaced residential PV *** mitigate VI using the batteries in this way,five challenges must be overcome,i.e.,equalizing all battery stress currents within the Dn,mitigating VI in abnormal conditions such as signal loss among bus controllers,being immune from the distorted feedback measurements,minimizing the steady-state error at different loads,and overcoming the insufficient num.er or capacity of the distributed batteries at the same *** fuzzy logic controllers(FLC)are proposed at each bus to overcome these five tasks based on a decentralized control *** proposed decentralized control based on FLC is compared with centralized control based on a PI *** proposed control method is tested and verified using simulations in the mATLAB/Simulink software,and the results validate the ability of the scheme to alleviate VI on a smart distribution network under both normal and abnormal conditions.

关键词： Fuzzy controller Distributed batteries Decentralized control Voltage imbalance Distributed PV

Developed mathematical technique for fractional stochastic point kinetics model in nuclear reactor dynamics

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nuclear Science and Techniques 2018年第9期29卷 197-213页

作者： ahmed e.Aboanber Abdallah A.nahla Adel m.edress Department of mathematics Faculty of Science Taibah University Department of mathematics Faculty of Science Tanta University

Fractional stochastic kinetics equations have proven to be valuable tools for the point reactor kinetics model, where the nuclear reactions are not fully described by deterministic relations. A fractional stochastic model for the point kinetics system with multi-group of precursors,including the effect of tem.erature feedback, has been developed and analyzed. A major mathematical and inflexible scheme to the point kinetics model is obtained by merging the fractional and stochastic technique. A novel split-step method including mathematical tools of the Laplace transforms, mittage–Leffler function, eigenvalues of the coefficient matrix, and its corresponding eigenvectors have been used for the fractional stochastic matrix differential equation. The validity of the proposed technique has been demonstrated via calculations of the mean and standard deviation of neutrons and precursor populations for various reactivities: step, ramp, sinusoidal, and tem.erature reactivity feedback. The results of the proposed method agree well with the conventional one of the deterministic point kinetics equations.

关键词： Ito stochastic point kinetics equations Tem.erature feedback effects Wiener process Fractional calculus mittage–Leffler function

GIS-based flash flooding susceptibility analysis and water management in arid mountain ranges:Safaga Region,Red Sea mountains,egypt

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Journal of mountain Science 2023年第12期20卷 3665-3686页

作者： ahmed e.eL-RAYeS mohamed O.ARnOUS ahmed m.heLmY Geology Department Faculty of ScienceSuez Canal UniversityIsmailia 41522Egypt Geology Department Faculty of ScienceArish UniversityArish 45511 North SinaiEgypt

The Safaga Region(SR)is part of the Red Sea mountain range in *** flash flooding is now an inescapable event,wreaking havoc and causing massive loss of life and *** majority of the floodwater,however,has been wasted as runoff to the Red Sea,which,if used wisely,could m.et a fraction of the water demands for a variety of applications in this *** current work aims to use GIS techniques to integrate remote sensing data for evaluating,mitigating,and managing flash floods in *** data set comprised Tropical Rainfall measuring mission(TRmm)thematic rainfall data,1:50,000 scale topographical map sheets,geological maps,the ASTeR Digital elevation model(ASTeR GDem),Landsat 7 enhanced Thematic mapper"(eTm7+),and Landsat 8 Operational Land *** flash flood risk model of SR is developed using ArcGIS-10.3 geoprocessing tools integrating all the causal factors thematic *** final flood risk model for the SR suggests that 57%of the total basins in the SR are at high risk of *** 38%of all basins are at moderate flood *** remaining 5%of basins are less prone to ***-prone zones were identified,suitable dam-building sites were located,and extremely probable areas for water recharge were *** the basis of reliable scientific data,structural and non-structural mitigation strategies that might reduce the damage susceptibility,alleviate the sensitivity of the flash flood,and best utilize its water supply were recom.ended.

关键词： Flash floods GIS Susceptibility Water management Arid mountains egypt

Antimicrobial activity of metal-substituted cobalt ferrite nanoparticles synthesized by sol-gel technique

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Particuology 2018年第5期16卷 141-151页

作者： A.h.Ashour ahmed I.e1-Batal m.I.A.Abdel maksoud Gharieb S.el-Sayyad Sh.Labib e.Abdeltwab m.m.el-Okr materials Science Laboratory Radiation Physics Department.National Center for Radiation Research and TechnologyAtomic Energy AuthorityCairoEgypt Drug microbiology Laboratory Drug Radiation Research DepartmentNational Center for Radiation Research and TechnologyAtomic Energy Authority CairoEgypt nuclear Chemistry Department Hot Laboratories CenterAtomic Energy AuthorityCairoEgypt Physics Department Faculty of Science (Girls Branch)Al-Azhar UniversityCairo.Egypt Physics Department.Faculty of Science (Boys Branch) Al-Azhar UniversityCairoEgypt

metal-substituted cobalt ferrites [mxCo(1-x)Fe2O4(m=Zn,Cu,mn;x=0.0,0.25,0.5,and 0.75)]were synthesized via a sol-gel *** ferrite structures were confirmed by X-ray diffraction, Fourier transform infrared spectroscopy,scanning electron microscopy,surface analysis using the Brunauer-em.ett-Teller method,and energy-dispersive X-ray *** activity of these ferrites against selected pathogenic microbes was *** structures remained cubic spinel phases after substitution of *** strongly influenced the microstructure and homoge- neous grain *** particle size of the ferrites increased linearly with increase in their annealing *** surface area of zinc cobalt ferrite nanoparticles (ZCFO)was 52.56m^2/g,the average pore size was 1.84nm,and pore volume was 0.136mL/*** ferrites showed antimicrobial activity toward all pathogens *** these,the most powerful was ZCFO,showing zones of inhibition of 13.0mm against Bacillus subtilis and Staphylococcus aureus and 12.0mm against Candida ***-irradiated ZCFO nanoparticles (150.0kGy)maintained higher antimicrobial activity than non-irradiated particles,e.g. being active toward *** (16.0mm).ZCFO is proposed as a candidate material for industrial and biomedical purposes.

关键词： Antibacterial Antifungal Zone of inhibition Zinc cobalt ferrite nanoparticles Gamma irradiation