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Improved combustion stability of biogas at different CO_(2) concentrations using inhomogeneous partially premixed stratified flames

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Global Energy Interconnection 2024年第4期7卷 486-502页

作者： Mohy Saad Mansour maged Kiriakos Lili Hao Mohamed Amr Serag-Eldin Mechanical Power Engineering Department Cairo University1 Gamaa StreetCairo Governorate 12613Egypt Mechanical Engineering Department The American University in CairoAUC AveCairo Governorate 11835Egypt College of Electrical Engineering and Control Science Nanjing Tech UniversityNanjing 211816P.R.China

Biogas is a renewable and clean energy source that plays an important role in the current environment of lowcarbon *** high-content CO_(2) in biogas can be separated,transformed,and utilized,it not only realizes high-value utilization of biogas but also promotes carbon reduction in the biogas *** improve the combustion stability of biogas,an inhomogeneous,partially premixed stratified(IPPS)combustion model was adopted in this *** thermal flame structure and stability were investigated for a wide range of mixture inhomogeneities,turbulence levels,CO_(2) concentrations,air-to-fuel velocity ratios,and combustion energies in a concentric flow slot burner(CFSB).A fine-wire thermocouple is used to resolve the thermal flame *** flame size was reduced by increasing the CO_(2) concentration and the flames became lighter *** flame temperature also decreased with increase in CO_(2) *** stability was reduced by increasing the CO_(2) ***,at a certain level of mixture inhomogeneity,the concentration of CO_(2) in the IPPS mode did not affect the ***,the IPPS mode of combustion should be suitable for the combustion and stabilization of *** should support the design of highly stabilized biogas turbulent flames independent of CO_(2) *** data show that the lower stability conditions are partially due to the change in fuel combustion energy,which is characterized by the Wobbe index(WI).In addition,at a certain level of mixture inhomogeneity,the effect of the WI on flame stability becomes dominant.

关键词： Biogas Renewable energy Effect of CO_(2) Combustion stability Burner design Renewable fuels Partial premixed

磁场下NiMnGa-THF-SDS复合强化甲烷水合物生成动力学

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哈尔滨工程大学学报 2024年

作者：吴琼王新妍李珍 maged Elhefnawy 李莉哈尔滨工程大学材料科学与化学工程学院黑龙江科技大学安全工程学院哈尔滨工程大学面向创新应用的先进纳米材料国际联合实验室黑龙江省先进纳米材料国际联合实验室(国际合作) 谢赫村大学工程学院机械工程系

针对天然气水合反应进程缓慢、生成量低等动力学问题，本文在磁场作用下将NiMnGa磁性微纳米颗粒与十二烷基硫酸钠（SDS）和低浓度四氢呋喃（THF）复配开展甲烷(CH4)水合物生成动力学研究，考察复配体系对CH4水合动力学影响。结果表明：N... 详细信息

针对天然气水合反应进程缓慢、生成量低等动力学问题，本文在磁场作用下将NiMnGa磁性微纳米颗粒与十二烷基硫酸钠（SDS）和低浓度四氢呋喃（THF）复配开展甲烷(CH4)水合物生成动力学研究，考察复配体系对CH4水合动力学影响。结果表明：NiMnGa微纳米颗粒协同动态磁场作用可有效缩短CH4水合物诱导时间、提高气体消耗量；进一步添加少量THF能够将诱导时间缩短至2 min，并将气体消耗量提高了15.2%，适当解决因THF占笼因素导致的气体消耗量低的问题，且与其他体系相比提高气体消耗速率效果最优，该体系可有效强化CH4水合物快速生成，本研究为促进天然气水合物利用技术应用提供了借鉴意义。

关键词：天然气 CH 水合物微纳米颗粒铁磁形状记忆合金 NiMnGa 磁场生成动力学促进剂

A Survey of Downlink Non-Orthogonal Multiple Access for 5G Wireless Communication Networks

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ZTE Communications 2016年第4期14卷 17-25页

作者： WEI Zhiqiang YUAN Jinhong Derrick Wing Kwan Ng maged elkashlan DING Zhiguo The University of New South Wales SydneyNSW 2052Australia Queen Mary University of London London E1 4NSUK Lancaster University Lancaster LA14YWUK

Non-orthogonal multiple access （NOMA） has been recognized as a promising multiple access technique for the next generation cel-lular communication networks. In this paper, we first discuss a simple NOMA model with two users served by a single-carrier si-multaneously to illustrate its basic principles. Then, a more general model with multicarrier serving an arbitrary number of users on each subcarrier is also discussed. An overview of existing works on performance analysis, resource allocation, and multiple-in-put multiple-output NOMA are summarized and discussed. Furthermore, we discuss the key features of NOMA and its potential re-search challenges.

关键词： non-orthogonal multiple access (NOMA) successive interference cancellation (SIC) resource allocation multiple-input multiple-output (MIMO)

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A Catalyst for Connected World

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ChinAfrica 2024年第9期16卷 18-19页

作者： maged REFAAT ABOULMAGD Egyptian Council for Foreign Affairs Egypt-China Friendship Association

China’s Belt and Road Initiative serves as an antidote to *** the last 10 years there has been calls for deglobalisation and decoupling as means to curb the so-called unbalanced trade,rein in immigration,and mend inequalities of asset and *** consider the world to have entered a period of deglobalisation,citing recent events such as Brexit,Trumpism,Russia-Ukraine conflicts,problems with supply chains,global energy crisis and decline in foreign direct investment.

关键词： chains global inequalities

Video Identification Based on Watermarking Schemes and Visual Cryptography

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Computer Systems Science & Engineering 2022年第2期40卷 441-453页

作者： maged Wafy Samr Gamal Zanaty Mahmoud Elkhouly Department of Information Technology Computers and Artificial Intelligence Helwan UniversityCairoEgypt Department of Information Technology Computing Studies Arab Open UniversityCairoEgypt Department of Information Technology Information Technology and Computer Science Sinai UniversityIsmailiaEgypt

Related to the growth of data sharing on the Internet and the wide-spread use of digital media,multimedia security and copyright protection have become of broad *** cryptography(VC)is a method of sharing a secret image between a group of participants,where certain groups of participants are defined as qualified and may combine their share of the image to obtain the original,and certain other groups are defined as prohibited,and even if they combine knowledge of their parts,they can’t obtain any information on the secret *** visual cryptography is one of the techniques which used to transmit the secrete image under the cover *** vision systems are connected to visual *** black and white image was originally used as a hidden *** order to achieve the owner’s copy right security based on visual cryptography,a watermarking algorithm is *** suggest an approach in this paper to hide multiple images in video by meaningful shares using one binary *** a common share,which we refer to as a smart key,we can decrypt several images *** on a given share,the smart key decrypts several hidden *** smart key is printed on transparency and the shares are involved in video and decryption is performed by physically superimposing the transparency on the *** binary,grayscale,and color images,we test the proposed method.

关键词： Visual cryptography(VC) video watermarking PSNR

Ionized cocatalyst to promote CO_(2) photoreduction activity over core-triple-shell ZnO hollow spheres

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Rare Metals 2022年第4期41卷 1077-1079页

作者： Swelm Wageh Omar A.Al-Hartomy maged F.Alotaibi Li-Jun Liu Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah21589Saudi Arabia College of Chemistry and Chemical Engineering Wuhan Textile UniversityWuhan430200China

Solar-driven CO_(2) conversion into value-added chemicals is a sustainable solution to achieve carbon ***’s group have recently reported Mn,C-codoped ZnO coretriple-shell hollow spheres(CTSHSs)for efficient CO_(2) **... 详细信息

关键词： reduction spheres catalyst

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Anti-Müllerian hormone and antral follicle count predict ovarian response in women less than 45 years following GnRH antagonist multiple-dose protocol

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Asian pacific Journal of Reproduction 2022年第5期11卷 208-216页

作者： Mohammed M.Laqqan maged M.Yassin Department of Laboratory Medical Sciences Faculty of Health SciencesIslamic University of GazaP.O.Box 108GazaPalestine Department of Human Physiology Faculty of MedicineIslamic University of GazaP.O.Box 108GazaPalestine

Objective:To speculate which of the following parameters:antral follicle count(AFC),anti-Müllerian hormone(AMH),follicle-stimulating hormone(FSH)and age can be used as a predictor of ovarian response to gonadotropin-releasing hormone(GnRH)antagonist stimulation multiple-dose protocol in women under 45 years,and to determine the cutoff value of these parameters and their correlations for predicting low and high ovarian ***:This prospective study included 462 women with the mean age of(29.3±6.5)*** women were subjected to the GnRH antagonist stimulation multiple-dose *** the second day of the menstrual cycle,ultrasonography was conducted to determine AFC in both *** blood samples were collected to evaluate the level of estradiol,FSH,luteinizing hormone,prolactin,thyroid-stimulating hormone,and *** women were divided into three groups:low response(AHH3.5 ng/mL,n=114).Results:A significant decrease was found in the age and FSH level in the high response group compared to other groups(P<0.001).Conversely,a significant increase was shown in AMH,estradiol on human chorionic gonadotropin(hCG)day,AFC,mature oocytes,fertilized oocytes,and embryos transferred in the high response group compared to the other two groups(P<0.001).The receiver operating characteristic(ROC)curves demonstrated that AFC and AMH had the highest accuracy,followed by basal FSH level and age in the prediction of low ovarian reserves(P<0.001)with cutoff values of≤4.50 and≤0.95 for AFC and AMH,***,the ROC analysis showed that AFC had the highest accuracy,followed by AMH level and age in the prediction of high ovarian reserves with a cutoff value of≥14.50,≥3.63,and≤27.50 years,respectively(P<0.01).A significant decrease was observed in women's age,estradiol level,and oocyte fertilization rate in pregnant women compared to non-pregnant women(P<0.001).Additionally,sign

关键词： Antral follicle count Anti-Müllerian hormone Antagonist Controlled ovarian stimulation GnRH Multiple-dose Ovarian response

Extraordinary piezoelectric effect induced in two-dimensional rare earth monochalcogenides via reducing system dimensionality

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Journal of Materiomics 2023年第1期9卷 72-81页

作者： Neveen I.Atallah maged El-Kemary Fabien Pascale Khaled E.El-Kelany Institute of Nanoscience and Nanotechnology Kafrelsheikh University33516Kafr el-skiekhEgypt Universite de Lorraine-Nancy CNRSLaboratoire de Physique et Chimie TheoriquesUMR 7019Vandoeuvre-les-NancyFrance

Piezoelectricity is pivotal for applications in micro/nanoelectromechanical systems(MEMS/NEMS).Inducing such a property in 2D systems via the reduction of the dimensionality of their corresponding 3D bulk is here *** on DFT theory and Gaussian-type-localized basis sets,the structural,electronic,mechanical,and piezoelectric properties of both 3D and 2D rare earth monochalcogenides RmX(Rm=Tm,Yb,Lu,and X=S,Se,Te)are investigated using the CRYSTAL *** intriguingly,the 2D LuX compounds display a buckled structure,where the Lu and X atoms protrude from the monolayer surface leading to an additional out-of-plane piezoelectric effect;(e_(31)=2104.84,1770.28,1689.79 pC/m,and d31=56.37,49.76,and 147.90 pm/V for LuS,LuSe,and LuTe,respectively).Such piezoelectric response is two orders of magnitude larger than the one of recently reported 2D ferroelectric MXenes,and is nearly thirty times larger than the commonly used AlN and GaN bulk ***,the reduced elastic constants obtained,when compared to other 2D materials,confirm the flexibility and softness of the considered 2D systems.

关键词： 2D materials Rare earth monochalcogenides DFT Gaussian basis CRYSTAL code Piezoelectric effect MEMS/NEMS

Optimal Deep Transfer Learning Based Colorectal Cancer Detection and Classification Model

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Computers, Materials & Continua 2023年第2期74卷 3279-3295页

作者： Mahmoud Ragab maged Mostafa Mahmoud Amer H.Asseri Hani Choudhry Haitham A.Yacoub Information Technology Department Faculty of Computing and Information TechnologyKing Abdulaziz UniversityJeddah21589Saudi Arabia Center for Artificial Intelligence in Precision Medicines King Abdulaziz UniversityJeddah21589Saudi Arabia Department of Mathematics Faculty of ScienceAl-Azhar UniversityNaser City11884CairoEgypt Cancer Biology Unit King Fahd Medical Research CenterKing Abdulaziz UniversityJeddah21589Saudi Arabia Department of Medical Laboratory Sciences Faculty of Applied Medical SciencesKing Abdulaziz UniversityJeddah22252Saudi Arabia Department of Molecular Genetics and Enzymology Human Genetics and Genome Research InstituteNational Research CentreCairo12622Egypt Biochemistry Department Faculty of ScienceKing Abdulaziz UniversityJeddah21589Saudi Arabia Cell Biology Department Biotechnology Research InstituteNational Research CentreGiza12622Egypt

Colorectal carcinoma(CRC)is one such dispersed cancer globally and also prominent one in causing cancer-based ***,pathologists execute CRC diagnosis through visible scrutinizing under the microscope the resected tissue samples,stained and fixed through Haematoxylin and Eosin(H&E).The advancement of graphical processing systems has resulted in high potentiality for deep learning(DL)techniques in interpretating visual anatomy from high resolution medical *** study develops a slime mould algorithm with deep transfer learning enabled colorectal cancer detection and classification(SMADTL-CCDC)*** presented SMADTL-CCDC technique intends to appropriately recognize the occurrence of colorectal *** accomplish this,the SMADTLCCDC model initially undergoes pre-processing to improve the input image *** addition,a dense-EfficientNet technique was employed to extract feature vectors from the pre-processed ***,SMA with Discrete Hopfield neural network(DHNN)method was applied for the recognition and classification of colorectal *** utilization of SMA assists in appropriately selecting the parameters involved in the DHNN approach.A wide range of experiments was implemented on benchmark datasets to assess the classification performance.A comprehensive comparative study highlighted the better performance of the SMADTL-CDC model over the recent approaches.

关键词： Colorectal cancer deep transfer learning slime mould algorithm hyperparameter optimization biomedical imaging