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Prediction and Modelling of Corrosion in Steel Storage Tank Using Non-destructive Inspection

材料科学与工程（中英文B版） 2013年第12期3卷 785-792页

作者： mosaad mohamed sadawy Eltohamy Rabie Elsharkawy Faculty of Engineering AI-Azhar University Cairo Egypt Nuclear & Radiological Regulatory Authority Cairo Egypt

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Ferroresonance Overvoltage Mitigation Using STATCOM for Grid-connected Wind Energy Conversion Systems

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Journal of Modern Power Systems and Clean Energy 2022年第2期10卷 407-415页

作者： mohamed I.mosaad Nehmdoh A.Sabiha Yanbu Industrial College Yanbu A1 SinaiyahKingdom of Saudi Arabia the Electrical Engineering Department Faculty of EngineeringMenofia University32511 Shebin ElkomEgyptand she is on leave to work at the Electrical Engineering DepartmentCollege of EngineeringTaif University21974 TaifKingdom of Saudi Arabia

We present the ferroresonance overvoltage mitigation concerning the power systems of the grid-connectcd wind energy conversion systems(WECSs).WECS is considered based on a doubly-fed induction generator(DFIG).Ferroresonance overvoltage associated with a single-pole outage of the line breaker is mitigated by fast regulating the reactive power using the static compensator(STATCOM).STATCOM controller is introduced,in which t>\o incorporated proportional-integral(PI)controllers are optimally tuned using a modified flow-er pollination algorithm(MFPA)as an optimization *** show the capability of the proposed STATCOM controller in mitigating the ferroresonance overvoltage,two test cases are introduced,which are based on the interconnection status of the power transformer used with the grid-connected *** results show that the ferroresonance disturbance can occur for the power transformers installed in the wind farms although the transformer terminals are interconnected,and neither side of the transformer is ***,as a mitigation method of ferroresonance overvoltage,the proposed STATCOM controller succeeds in improving the system voltage profile and speed profile of the wind turbine as well as protecting the system components against the ferroresonance overvoltage.

关键词： Ferroresonance overvoltage doubly-fed induction generator(DFIG) static compensator(STATCOM) wind energy conversion system(WECS).

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Effect of Zn/Mg ratio on cathodic protection of carbon steel using Al-Zn-Mg sacrificial anodes

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Transactions of Nonferrous Metals Society of China 2020年第8期30卷 2067-2078页

作者： mosaad sadawy Saad SAAD Randa ABDEL-KARIM Department of Mining and Petroleum Engineering Faculty of EngineeringNasr CityAl-Azhar UniversityCairo 11371Egypt Department of Metallurgy Faculty of EngineeringCairo UniversityGiza 12613Egypt

Al-Zn-Mg alloys with different Zn/Mg mass ratios were evaluated as sacrificial anodes for cathodic protection of carbon steel in 3.5 wt.%Na Cl *** anodes were fabricated from pure Al,Zn and Mg metals using casting *** microscopy,SEM-EDS,XRD and electrochemical techniques were *** results indicated that with decreasing Zn/Mg mass ratio,the grain size ofα(Al)and the particle size of the precipitates decreased while the volume fraction of the precipitates *** anode with Zn/Mg mass ratio>4.0 exhibited the lowest corrosion rate,while the anode with Zn/Mg mass ratio<0.62 gave the highest corrosion rate and provided the highest cathodic protection efficiency for carbon steel(AISI 1018).Furthermore,the results showed that the anode with Zn/Mg mass ratio<0.62 exhibited a porous corrosion product compared to the other anodes.

关键词： cathodic protection Al-Zn-Mg sacrificial anode current capacity passive film precipitate grain size

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3D static modeling and sequence stratigraphy using well logs and seismic data:An example of Abu Roash G member in Bahga oilfield

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Energy Geoscience 2024年第3期5卷 362-377页

作者： mohamed Reda mohamed Fathy mohamed mosaad Fahad Alshehri mohamed S.Ahmed Geology Department Faculty of ScienceAl-Azhar UniversityP.O.Box 11884Nasr CityCairoEgypt Abdullah Alrushaid Chair for Earth Science Remote Sensing Research Geology and Geophysics DepartmentCollege of ScienceKing Saud UniversityRiyadh11451Saudi Arabia

This research uses both three-dimensional(3D)modeling and geologic well control to piece back together the architectural parts of the Late Cretaceous *** goal is to figure out the sizes,directions,locations,and controls of the layers of the fluvial sandstone *** stratigraphy is essential for 3D reservoir modeling and petroleum geology understanding in the Bahga *** purpose of this work is to create a static model that shows the layers and facies distribution in the reservoir *** will use data from nine well logs and 22 seismic lines calibrated by the Abu Roash G Member reservoir core intervals to accomplish *** petrophysical study discovered three parts in the Abu Roash G Member reservoir rock:channel fill that is affected by tides,channel fill that is dominated by tides(intertidal sands),and channel top with lenticular bedded *** model's findings point to the existence of an NNW-oriented sand body,which could be a prime location to produce *** original oil in place(OOIP)is about 3,438,279 Stock Tank Barrels(STB),and the oil reserve reaches up to 1,031,484(STB).Sequence stratigraphic analysis using seismic and well log information(SB)reveals that the Upper Cretaceous AR/G reservoir of the Bahga field is characterized by third-and fourth-order stratigraphic sequences,which are constrained by three Maximum Flooding Surfaces(MFS)and two Sequence *** integration of the derived geological model and sequence stratigraphic results can lower future extraction risk by identifying the locations and trends of the geologic facies with the necessary petrophysical properties for the hydrocarbon accumulations.

关键词： Three-dimensional reservoir modeling Sequence stratigraphy Reservoir characterization Abu Roash reservoir Abu Gharadig Basin

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Formation and Characterization of Zinc Phosphate Coating on Reinforcing Steel Rebars

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材料科学与工程（中英文A版） 2013年第7期3卷 481-487页

作者： mosaad Mohamad sadawy mohamed Taha Nooman Eltohamy Rabie Elsharkawy Mining and Petroleum Engineering Department Faculty of Engineering Al-Azhar University Nasr City 11884 Cairo Egypt Civil Engineering Department Faculty of Engineering Al-Azhar University Nasr City 11884 Cairo Egypt Nuclear & Radiological Regulatory Authority. Cairo Egypt

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Influence of ECAP as grain refinement technique on microstructure evolution, mechanical properties and corrosion behavior of pure aluminum

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Transactions of Nonferrous Metals Society of China 2015年第12期25卷 3865-3876页

作者： mohamed Ibrahim ABD EL AAL M.M.sadawy Mechanical Design and Production Department Faculty of Engineering Zagazig University Mining and Petroleum Engineering Department Al-Azhar University

Pure aluminum samples were processed by equal channel angular pressing（ECAP） up to 10 passes at room temperature. The effects of the ECAP number of passes on the microstructure evolution, the mechanical properties, deformation homogeneity and corrosion behavior of the processed samples were fully investigated. The imposed strain resulted in an obvious reduction in the grain size from 390 μm before ECAP down to 1.8, 0.4, and 0.3 μm after ECAP up to 2, 4 and 10 passes, respectively. The microhardness, deformation homogeneity and tensile strength were increased while the elongation decreased with the increase of ECAP number of passes. Immersion tests, open circuit potential, Tafel polarization, cyclic polarization and potentiostatic measurements in 3.5% Na Cl solution revealed an obvious improvement in the corrosion resistance of ECAP processed samples compared with the as-cast sample. The increase of the number of passes can be used successfully in producing ultra-fine grained（UFG） bulk pure aluminum sample with a high misorientation angle, reasonably high mechanical properties and corrosion resistance.

关键词： equal channel angular pressing(ECAP) microstructure mechanical properties corrosion resistance passive film pitting

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Hepatitis C virus-mediated angiogenesis:Molecular mechanisms and therapeutic strategies

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World Journal of Gastroenterology 2014年第42期20卷 15467-15475页

作者： mohamed Hassan Denis Selimovic Abdelouahid El-Khattouti Martine Soell Hanan Ghozlan Youssef Haikel Ola Abdelkader mosaad Megahed Cancer Institute University of Mississippi Medical Center Institut National de la Santé et de la Recherché Médicale S 1121 Hospitals of Hautepierre Dental Faculty University of Strasbourg Department of Operative Dentistry and Endodontics Hospitals of Hautepierre Dental Faculty University of Strasbourg Department of Periodontology Hospitals of Hautepierre Dental Faculty University of Strasbourg Department of Microbiology Faculty of Science Medical research Institute University of Alexandria Department of Microbiology Medical research Institute University of Alexandria Clinic of Dermatology University Hospital of Aachen

Angiogenesis is an essential process for organ growth and repair. Thus, an imbalance in this process can lead to several diseases including malignancy. Angiogenesis is a critical step in vascular remodeling, tissue damage and wound healing besides being required for invasive tumor growth and metastasis. Because angiogenesis sets an important point in the control of tumor progression, its inhibition is considered a valuable therapeutic approach for tumor treatment. Chronic liver disease including hepatitis C virus(HCV) infection is one of the main cause for the development of hepatic angiogenesis and thereby plays a critical role in the modulation of hepatic angiogenesis that finally leads to hepatocellular carcinoma progression and invasion. Thus, understanding of the molecular mechanisms of HCV-mediated hepatic angiogenesis will help design a therapeutic protocol for the intervention of HCV-mediated angiogenesis and subsequently its outcome. In this review, we will focus on the molecular mechanisms of HCV-mediated hepatic angiogenesis and the related signaling pathways that can be target for current and under development therapeutic approaches.

关键词： Hepatitis C virus Hepatocellular carcinoma Angiogenesis Signaling pathway Therapy

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Preventive strategies for anastomotic leakage after colorectal resections: A review

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World Journal of Meta-Analysis 2019年第8期7卷 389-398页

作者： Mostafa Shalaby Waleed Thabet mosaad Morshed mohamed Farid Pierpaolo Sileri Department of General Surgery Mansoura University Hospitals Mansoura University Dakahliya Mansoura 35516 Egypt Department of General Surgery UOC C Policlinico Tor Vergata Hospital University of Rome Tor Vergata Rome 00133 Italy

Anastomosis is a crucial step in radical cancer surgery. Despite being a daily practice in gastrointestinal surgery, anastomotic leakage (AL) stands as a frequent postoperative complication. Because of increased morbidity, mortality, combined with longer hospital stay, the rate of re-intervention, and poor oncological outcomes, AL is considered the most feared and life-threatening complication after colorectal resections. Furthermore, poor functional outcomes with a higher rate of a permeant stoma in 56% of patients this could negatively affect the patient’s quality of life. This a narrative review which will cover intraoperative anastomotic integrity assessment and preventive measures in order to reduce AL. Although the most important prerequisites for the creation of anastomosis is well-perfused and tension-free anastomosis, surgeons have proposed several preventive measures, which were assumed to reduce the incidence of AL, including antibiotic prophylaxis, intraoperative air leak test, omental pedicle flap, defunctioning stoma, pelvic drain insertion, stapled anastomosis, and general surgical technique. However, lack of clear evidence of which preventive measures is superior over the other combined with the fact that the decision remains based on the surgeon’s choice. Despite the advances in surgical techniques, AL remains a serious health problem associated with increased morbidity, mortality with additional cost. Many preventative measures were employed with no clear evidence supporting the superiority of stapled anastomosis over hand-Sewn anastomosis, coating of the anastomosis, or pelvic drain. Defunctioning stoma, when justified it could decrease the leakage-related complications and the incidence of reoperation. MBP combined with oral antibiotics still recommended.

关键词： Anastomotic leakage Colorectal Resection Anastomosis Cancer Anastomotic disruption

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Nutrient Fluxes and Sediments Composition in El Mex Bay and Surround Drains, Alexandria, Egypt

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American Journal of Analytical Chemistry 2015年第6期6卷 513-527页

作者： mohamed Attia Shreadah Mamdouh Saad Masoud Abdel-Rhman mosaad Khattab Gehan mohamed El Zokm National Institute of Oceanography and Fisheries Alexandria Egypt Faculty of Science Alexandria University Alexandria Egypt Faculty of Science Al-Azhar University Cairo Egypt

The regeneration of pore water (PW) nutrients was investigated and the contribution of benthic nutrient fluxes to the overlying bottom water (BW) was examined. Dissolved inorganic nutrients (NO-2, NO-3, PO3-4 and SIO4-4) were measured in PW and BW in El Mex Bay and surround drains during spring 2010. Nutrient concentrations gradiance in PW with overlying seawater were evaluated according to Fick’s Law. Average inorganic nutrient fluxes were estimated using the pore water gradient concentration across the sediment-water interface. Calculated nutrient fluxes had averages of ﹣7.24, ﹣1.36, ﹣7.86 and ﹣1.33 in El Mex Bay. Additionally, the fluxes in the drains were ﹣34.39, ﹣32.28, ﹣53.20 and ﹣117.6 mg·m﹣2·day﹣1 for NO-3, NO-2, PO3-4 and SIO4-4, respectively. Mineralogical studies of sediment samples by using IR, X-ray analysis were carried out to identify the chemical structure of sediments. The results revealed that calcite, aragonite and quartz are the dominant minerals. On the other hand, differential thermal analysis (DTA) was used to evaluate and discuss different kinetic parameters such as Ea#, ΔG#, ΔH#, ΔS#, Z and Tm support the view of the extra stability of these sediments.

关键词： Nutrient Fluxes IR-X-Ray-DTA Sediments El Mex Bay Alexandria Egypt

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Effects of natural compounds in treatment and prevention ofhepatotoxicity and hepatocellular carcinoma

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Hepatoma Research 2015年第1期1卷 111-118页

作者： mohamed A.Hamzawy Ezzeldein S.M.El-Denshary mosaad A.Abdel-Wahhab Department of Pharmacology and Toxicology College of PharmacyMisr University for Science and Technology6th of October City 15525Egypt Department of Pharmacology and Toxicology Faculty of PharmacyCairo UniversityCairo 11562Egypt Department of Food Toxicology and Contaminants National Research CentreDokkiCairo 12622Egypt

Liver diseases are most common disorders in the world and characterized by rapid changes from steatosis to chronic hepatitis,fi brosis,cirrhosis,and hepatocellular carcinoma(HCC).Natural products that attained great attention is to be used in the prevention and treatment of multiple diseases in *** researches have been reported numerous natural and phytochemical compounds that may counteract or prevent the hepatic injury and primary liver *** conservative treatment of liver toxicity and HCC may face awkward challenges in chemotherapy such as therapeutic failure or drug ***,there is an actual need for safe and effective therapeutic and preventive modalities for liver *** present review aims to focus on the potential protective and therapeutic effects of natural compounds in the prevention and treatment of hepatotoxicity and *** also demonstrates the mechanism of the natural products in enzymatic regulation of antioxidants and its role in apoptosis and proliferation of cancerous lesions of ***,it highlights the promising role of natural bioactive compounds and provides the rational for further transitional researches,and emphasize on the scientifi c validation of natural compounds for therapeutic portfolio for clinical use in liver diseases.

关键词： Antioxidant hepatocellular carcinoma hepatotoxicity liver natural compounds

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