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Depositional Environment,Petrophysical Evaluation and Electrical Properties of Zeit Formation,Northwestern Shore of Gulf of Suez,Egypt

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Journal of Earth Science 2024年第5期35卷 1720-1737页

作者： mohamed m.gomaa Emad A.Abd El Aziz Geophysical Sciences Department National Research CentreEl-Behoos St.DokkiCairo 12622Egypt

The Zeit sand reservoir is one of the most prolific formations at Northwestern side of the Gulf of *** this research we will try to coordinate between electrical,petrophysical properties,depositional environment and facies discrimination in order to evaluate the hydrocarbon potentiality of studied Zeit *** statistical parameters for potassium(K),thorium(Th)and Th/U ratio contents have a general increase towards northwestern parts,whereas uranium(U)content has a general increase towards southeastern *** sandstone facies is distinguished from the other facies by its thorium content>4 ppm.U has high carbonate content(U≥1 ppm).Rocks'electrical properties vary greatly depending on a number of *** measurements were taken at frequencies range of(5×10^(-4)Hz-100 kHz)for fully saturated samples(clayey sandstone)with NaCl(20 gm/L).As salinity,clay content,and frequency increase,consequently does the electrical *** continental condition are present in northwestern part(back-sea)which is distinguished by high K percent,high Th,high Th/U ratio,and low U *** K,Th,and Th/U ratio contents,with high U contents,characterize the marine depositional environment that existed around the east and southeastern parts(foresea coincide with the dipping of strata).Furthermore,the studied Zeit Formation has good petrophysical properties that coincide with marine *** middle and eastern parts(around ISS-94 and CSS-288)is a good reservoir(porosity 36%-39%,shale content<15%,hydrocarbon saturation 71%-92%,and net pay thickness 17-63 feet).

关键词： Zeit Formation petrophysical evaluation depositional environment Spectral Gamma Ray electrical properties gulf of Suez sedimentology

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Optimization of double chamber microbial fuel cell for domestic wastewater treatment and electricity production

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燃料化学学报 2015年第9期43卷 1092-1099页

作者： Amr El-Hag Ali Ola m.gomaa Reham Fathey Hussein Abd El Kareem mohamed Abou Zaid Polymer Chemistry Department microbiology Department National Center for Radiation Research and Technology (NCRRT) Egyptian Atomic energy Authority ( EAEA ) Nasr City Cairo Egypt DAS Taibah University Medinah KSA

microbial fuel cells(m FCs)represent a new approach for treating w aste w ater along w ith electricity *** present study addressed electricity production from domestic w astew ater using a mediator-less double chamber m *** electricity production w as monitored under different operational conditions for both summer and w inter *** of the anodic and cathodic chambers resulted in a maximal current of 0.784 and 0.645 m A w ith the maximal pow er intensity of 209 and 117 m W/m2in pow er duration of 24 h for the summer and w inter samples,*** electron microscopy show ed that the bacterial biofilm formation on the anode w as denser for the summer sample than that w hen the w inter sample w as used,so w as the total bacterial ***,samples taken during summer w ere considered better in electricity production and w aste w ater treatment than those taken during w inter basically because of the high microbial load during the hot *** parallel,there w as a decrease in both biological oxygen demand(BOD5)and chemical oxygen demand(COD)values which reached 71.8%and 72.85%,respectively at the end of the operation process for the summer sample,w hile there w as no evident decrease for the w inter *** the operating conditions not only increased the potential of using domestic w aste w ater in microbial fuel cells to produce electricity,but also improved the quality of the domestic w aste w ater.

关键词：微生物引起的燃料房间国内废水处理操作条件电生产

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The impact of alpha-fetoprotein (AFP), child-turcotte-pugh (CTP) score and disease staging on the survival of hepatocellular carcinoma (HCC) patients: a retrospective cohort from single oncology center

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Oncology research 2025年第1期33卷 149-160页

作者： Nasser mulla Yousef Katib Asim m Almughamsi Duaa S Alkhayat mohamed mosaad Samir T Alfotih Rawan Alaofi Department of Internal medicine Faculty of Medicine Taibah University Madinah 42278 Saudi Arabia. Department of Radiology Faculty of Medicine Taibah University Madinah 42278 Saudi Arabia. Department of Surgery Faculty of Medicine Taibah University Madinah 42278 Saudi Arabia. Department of Endemic and Infectious Diseases Suez Canal University Ismailia 41522 Egypt. King Salman bin Abdulaziz medical City Madinah 42311 Saudi Arabia. Prince mohammed Bin Abdulaziz Hospital Madinah 41511 Saudi Arabia.

Background:Hepatocellular carcinoma (HCC) is the most common cause of cancer-related death in Saudi Arabia. Our study aimed to investigate the patterns of HCC and the effect of TNm staging, Alfa-fetoprotein (AFP), and Child-Turcotte Pugh (CTP) on patients' overall survival (OS).methods:A retrospective analysis was conducted on 43 HCC patients at a single oncology center in Saudi Arabia from 2015 to 2020. All patients had to fulfill one of the following criteria: (a) a liver lesion reported as definitive HCC on dynamic imaging and/or (b) a biopsy-confirmed diagnosis.Results:The mean patient age of all HCC cases was 66.8 with a male-to-female ratio of 3.3:1. All patients were stratified into two groups: viral HCC (n = 22, 51%) and non-viral HCC (n = 21, 49%). Among viral-HCC patients, 55% were due to HBV and 45% due to HCV. Cirrhosis was diagnosed in 79% of cases. Age and sex did not significantly statistically differ in OS among viral and non-viral HCC patients (-value > 0.05). About 65% of patients had tumor size >5 cm during the diagnosis, with a significant statistical difference in OS (-value = 0.027). AFP was >400 ng/ml in 45% of the patients. There was a statistically significant difference in the OS in terms of AFP levels (-value = 0.021). A statistically significant difference was also observed between the CTP score and OS (-value = 0.02). CTP class B had the longest survival. BSC was the most common treatment provided to HCC patients followed by sorafenib therapy. There was a significant statistical difference in OS among viral and non-viral HCC patients (-value = 0.008).Conclusions:The most common predictors for OS were the underlying cause of HCC, AFP, and tumor size. Being having non-viral etiology, a tumor size >5 cm, an AFP > 400 ng/mL, and a CTP score class C were all negatively associated with OS.

关键词： Alpha-fetoprotein (AFP) Child-turcotte-pugh Hepatocellular carcinoma Pattern Progression free survival

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Review of analytical methods for stress and deformation analysis of buried water pipes considering pipe-soil interaction

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Underground Space 2023年第6期13卷 205-227页

作者： Yingxu Huo Sherif mohsen mohamed Hassan gomaa Tarek Zayed mohamed meguid Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHung HomHong Kong 999077China Department of Building and Real Estate The Hong Kong Polytechnic UniversityHung HomHong Kong 999077China Structural Engineering Department Faculty of EngineeringMansoura UniversityMansoura 35516Egypt Department of Civil Engineering McGill UniversityMontrealQuebec H3A 0G4Canada

Buried water pipelines are vulnerable to fail or break due to excessive loading or ground *** evaluation of pipe performance and serviceability relies on the proper understanding of pipe-soil interactions(PSI).Analytical methods are important approaches to studying ***,a systematic and thorough literature review to analyze the existing research trends,technological achievements and future research opportunities is not *** work investigates analytical methods that analyze the stress and deformation of pipes in terms of cross-sectional,transverse and longitudinal PSI ***,scientometric analysis is performed to acquire relevant research works from online databases and analyze the existing data of influential authors,productive research sources and frequent key word occurrence in the fields of ***,a qualitative discussion is performed in the three categories of PSI:(1)cross-sectional,including ovalization and circumferential behaviours;(2)transverse,including seismic fault crossing,weak soil zones,ground settlement and pipe uplift;and(3)***,six research opportunities are discussed,including the role of friction in cross-sectional deformation,combined effects of bending and compression,choice of soil reaction models and calibration of key parameters,effect of pipe flaws,soil spatial variability and behaviours of curved *** study helps beginners familiarize themselves with PSI analytical methods and provides experienced researchers with ideas for future research directions.

关键词： Pipeline Analytical methods Pipe-soil interactions Seismic fault Settlement Uplift Buckling Tunnelling

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Influence of Fe_(2)O_(3) on the physical,structural and electrical properties of sodium lead borate glasses

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Journal of Advanced Ceramics 2014年第2期3卷 155-164页

作者： Safeya IBRAHIm mohamed mahmoud gomaa Hussein DARWISH Glass Research Department National Research CentreDokkiCairoEgypt Geophysical Sciences Department National Research CentreDokkiCairoEgypt

The influence of adding Fe_(2)O_(3) at the expense of Na_(2)O in sodium lead borate glasses on the structural,physical and electrical properties have been *** obtained from Fourier transform infrared(FTIR)spectra indicated that Fe_(2)O_(3) plays an important role in converting three coordinated boron atoms[BO_(3)]to four coordinated boron atoms[BO4].The physical properties such as density and molar volume helped to evaluate the compact structure of the prepared glass samples due to presence of[BO4]*** increase of Fe_(2)O_(3)/Na_(2)O replacements led to increasing the microhardness values and decreasing the thermal expansion coefficients of the studied *** increase of Fe_(2)O_(3)/Na_(2)O replacements generally decreased the AC *** decrease might be due to converting of the three coordinated boron atoms[BO_(3)]to four coordinated boron atoms[BO_(4)].Dielectric constants of the samples might be an indication of the distortion in the coordinated boron *** obtained experimental data indicated the internal structure of glass network and the change of the structure of the samples from three[BO_(3)]to four coordinated boron atoms[BO4].

关键词： borate glasses Fourier transform infrared(FTIR)spectra microhardness thermal expansion AC electrical properties

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Dynamic Interaction Analysis of Coupled Axial-Torsional-Lateral mechanical Vibrations in Rotary Drilling Systems

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Structural Durability & Health monitoring 2025年第1期19卷 77-103页

作者： Sabrina meddah Sid Ahmed Tadjer Abdelhakim Idir Kong Fah Tee mohamed Zinelabidine Doghmane madjid Kidouche Applied Automation Laboratory Faculty of Hydrocarbons and ChemistryUniversity of BoumerdesBoumerdes35000Algeria Institute of Electrical and Electronic Engineering(IGEE) University of BoumerdesBoumerdes35000Algeria Laboratory of the Electrification of Industrial Enterprises University of BoumerdesBoumerdes35000Algeria Electrical Engineering Department Mohamed Boudiaf University of M’silaM’sila28000Algeria Department of Civil and Environmental Engineering King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Interdisciplinary Research Center for Construction and Building materials King Fahd University of Petroleum&Minerals(KFUPM)Dhahran31261Saudi Arabia

maintaining the integrity and longevity of structures is essential in many industries,such as aerospace,nuclear,and *** achieve the cost-effectiveness of large-scale systems in petroleum drilling,a strong emphasis on structural durability and monitoring is *** study focuses on the mechanical vibrations that occur in rotary drilling systems,which have a substantial impact on the structural integrity of drilling *** study speciﬁcally investigates axial,torsional,and lateral vibrations,which might lead to negative consequences such as bit-bounce,chaotic whirling,and high-frequency *** events not only hinder the efﬁciency of drilling but also lead to exhaustion and harm to the system’s components since they are difﬁcult to be detected and controlled in real *** study investigates the dynamic interactions of these vibrations,speciﬁcally in their high-frequency modes,usingﬁeld data obtained from measurement while ***ﬁndings have demonstrated the effect of strong coupling between the high-frequency modes of these vibrations on drilling sys-tem *** obtained results highlight the importance of considering the interconnected impacts of these vibrations when designing and implementing robust control ***,integrating these compo-nents can increase the durability of drill bits and drill strings,as well as improve the ability to monitor and detect ***,by exploiting theseﬁndings,the assessment of structural resilience in rotary drilling systems can be ***,the study demonstrates the capacity of structural health monitoring to improve the quality,dependability,and efﬁciency of rotary drilling systems in the petroleum industry.

关键词： Rotary drilling systems mechanical vibrations structural durability dynamic interaction analysis ﬁeld data analysis

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middle East respiratory syndrome coronavirus： a comprehensive review

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Frontiers of medicine 2016年第2期10卷 120-136页

作者： mahmoud m. Shehata mokhtar R. gomaa mohamed A. Ali Ghazi Kayali Center of Scientific Excellence for Influenza Viruses National Research Centre Giza Egypt Department of Infectious Diseases St. Jude Children's Research Hospital Memphis TN 38105 USA

The middle East respiratory syndrome eoronavirus was first identified in 2012 and has since then remained uncontrolled. Cases have been mostly reported in the middle East, however travel-associated cases and outbreaks have also occurred. Nosocomial and zoonotic transmission of the virus appear to he the most important routes. The infection is severe and highly fatal thus necessitating rapid and efficacious interventions. Here, we performed a comprehensive review of published literature and summarized the epidemiology of the virus. In addition, we summarized the virological aspects of the infection and reviewed the animal models used as well as vaccination and antiviral tested against it.

关键词： mERS coronavirus review

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Efficient PbS quantum dots tandem solar cells through compatible interconnection layer

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Journal of Energy Chemistry 2024年第11期98卷 47-57页

作者： gomaa mohamed gomaa Khalaf Xinzhao Zhao mingyu Li Chunxia Li Salman Ali Tianjun ma Hsien-Yi Hsu Jianbin Zhang Haisheng Song Wuhan National Laboratory for Optoelectronics(WNLO) Huazhong University of Science and Technology(HUST)Wuhan 430074HubeiChina Solar and Space Department National Research Institute of Astronomy and Geophysics(NRIAG)HelwanCairoEgypt School of Energy and Environment&Department of materials Science and Engineering City University of Hong KongKowloon TongHong Kong 999077China School of Integrated Circuits Huazhong University of Science and TechnologyWuhan 430074HubeiChina Optics Valley Laboratory Wuhan 430074HubeiChina

Lead sulfide quantum dots(PbS QDs) hold unique characteristics, including bandgap tunability, solutionprocessability etc., which make them highly applicable in tandem solar cells(TSCs). In all QD TSCs, its efficiency lags much behind to their single junction counterparts due to the deficient interconnection layer(ICL) and defective subcells. To improve TSCs performance, we developed three kinds of ICL structures based on 1.34 and 0.96 e V PbS QDs subcells. The control, 1,2-ethanedithiol capped PbS QDs(PbS-EDT)/Au/tin dioxide(SnO_(2))/zinc oxide(Zn O), utilized SnO_(2) layer to obtain high surface ***, its energy level mismatch causes incomplete recombination. Bypassing it, the second ICL(PbS-EDT/Au/Zn O) removed SnO_(2) and boosted the power conversion efficiency(PCE) from 5.75% to 8.69%. In the third ICL(PbS-EDT/poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine](PTAA)/Au/Zn O), a thin layer of PTAA can effectively fill fissures on the surface of PbS-EDT and also protect the front cells from solvent penetration. This TSC obtained a PCE of 9.49% with an open circuit voltage of 0.91 V, a short circuit current density of 15.47 m A/cm~2, and a fill factor of 67.7%. To the best of our knowledge, this was the highest PCE achieved by all PbS QD TSCs reported to date. These TSCs maintained stable performance for a long working time under ambient conditions.

关键词： Quantum dots Tandem solar cell Interconnection layer Hysteresis Defect

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Experimental Investigation of the Small-scale Fixed multi-chamber OWC Device

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Chinese Journal of mechanical Engineering 2021年第5期34卷 408-421页

作者： mohammad Shalby Ahmed Elhanafi Paul Walker David G.Dorrell Ahmad Salah mohamed R.gomaa mohamed Behiri mechanical Engineering Department Faculty of EngineeringAl-Hussein Bin Talal UniversityMa’an 71111Jordan National Centre for maritime Engineering and Hydrodynamics Australian Maritime CollegeUniversity of TasmaniaLauncestonTAS 7250Australia School of mechanical and mechatronic Systems University of Technology SydneySydneyNSW 2007Australia School of Electrical and Information Engineering University of the WitwatersrandDurban 2000South Africa Electrical Engineering Department Faculty of EngineeringAl Hussein Bin Talal UniversityMa’an 71111Jordan mechanical Engineering Department Benha Faculty of EngineeringBenha UniversityBenha 13518Egypt 不详

Sea wave energy generators or converters(WECs)have the potential to become a viable technology for clean,renewable energy *** the WEC technologies,the oscillating water columns(OWCs)are the most common WEC devices *** have been studied and developed over many ***-chamber oscillating water columns(mC-OWC)have the potential to have a higher energy conversion when extracting energy in mixed sea states than single-chamber *** the work reported in this paper,physical experiments are carried under regular wave conditions to test the wave power extraction of a fixed mC-OWC small-scale *** Power Take-Off(PTO)of the device is simulated using orifice *** flow characteristics through these orifices are pre-calibrated such that the extracted power can be obtained only using the pressure *** condition effects on the damping of the PTO of the device power extraction are *** test results illustrate that the PTO system damping is critical and affects device performance.

关键词： cean wave energy Energy conversion Oscillating water column multi-chamber OWC

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The effect of Nb_(2)O_(5)on fast neutron removal cross section,optical,and structural properties of some calcium borate oxide glasses containing Bi^(3+)ions

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Radiation Detection Technology and methods 2019年第1期3卷 44-49页

作者： H.A.Saudi Hossam mohamed gomaa physics department faculty of scienceal-azhar university(girls branch)nasr citycairoegypt optical branch high institute of optics technologycairoegypt

Background In recent years,the preparation of transparent glass in the visible region has led to the development of radiation shielding materials with measuring structure and optical ***,the study on the interaction of neutron radiation with matter is important in the field of radiation *** Preparation of transparent calcium and bismuth borate oxide glasses containing Nb^(5+)ions can be used as a neutron radiation shield and determine refractive index with different methods for this *** Niobium bismuth borate glasses with composition 60B_(2)O_(3)–20CaO–(20−x)Bi_(2)O_(3)–xNb_(2)O_(5),where(x is in mol%,0≤x≤10),have been prepared using conventional melt-quenching technique;the structure of each sample was studied by XRD,FTIR,and UV spectra chart *** XRD and FTIR showed that all glass samples were highly homogeneous and had structured with short-rangeorder/amorphous *** refractive index of each sample was estimated by charts of UV–Vis and FTIR,in addition to an empirical method,and we obtained values very close to each *** refractive index values are relatively high,so this glass can be used in nonlinear studies as well as luminescence *** macroscopic fast neutron removal cross sections(R/ρ)have calculated,for all samples,and the highest value was in sample containing 2.5%niobium *** Bismuth borate glass containing a few niobium pentoxide can be used as a protective shield of neutrons.

关键词： Oxide glasses Refractive index UV–Vis Borate glass Optical properties

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