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Fate of Right Coronary Artery Occlusion after a Surgically Repaired Aorto- Ventricular Tunnel in a Neonate

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Congenital heart Disease 2024年第3期19卷 267-273页

作者： sherif Negm Loic Mace Fedoua El Louali Beatrice Desnous Philipe Aldebert Virginie Fouilloux Marien Lenoir Department of Pediatric Cardiac Surgery Hôpital Timone enfantAssistance Public-Hopitaux MarseilleAix-Marseille UniversitéMarseilleFrance Department of Cardiothoracic Surgery Tanta UniversityTantaEgypt Department of Pediatric Cardiology Hôpital Timone enfantAssistance Public-Hopitaux MarseilleAix-Marseille UniversitéMarseilleFrance Department of Neurology Hôpital Timone enfantAssistance Public-Hopitaux MarseilleAix-Marseille UniversitéMarseilleFrance

The aorto-ventricular tunnel is a rare congenital cardiac *** present a case of aorto-ventricular tunnel diagnosed via fetal *** surgery was performed on the 2nd day of life to close the tun-nel,located just in front of the right coronary ostium,due to the patient’s unstable health *** post-operative period revealed complete occlusion of the right coronary *** to the patient’s stability,we opted not to reintervene on the right coronary *** patient fully recovered without the need for further coronary *** cases of patients with an aorto-ventricular tunnel(AVT)and associated coronary lesions,it is crucial to exercise caution when intervening in the coronary arteries.

关键词： Aorto-ventricular tunnel aorta right coronary artery

氮掺杂对环境空气中TiO_(2)纳米催化剂抗甲醛光催化矿化的影响

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Chinese Journal of Catalysis 2024年第4期59卷 303-323页

作者： Dae-hwan Lim Aadil Bathla hassan Anwer sherif AYounis Danil WBoukhvalov Ki-hyun Kim 汉阳大学土木与环境工程系韩国首尔国立科技大学环境工程系巴基斯坦伊斯兰堡埃及石油研究所分析与评估部埃及开罗南京林业大学材料物理与化学研究所理学院江苏南京乌拉尔联邦大学物理与技术研究所俄罗斯叶卡捷琳堡

通过氮掺杂TiO_(2)(N-TiO_(2))浸渍蜂窝过滤器构建了一系列原型光催化空气净化器(AP(N_(x)-C_(y)))系统,并用于在UV-LED光(1 W)照射条件下光催化分解0.5-5 ppm甲醛(Ch_(2)O)蒸汽.在上述催化过滤器系统中,Nx和Cy分别代表N/Ti摩尔比(0-20)... 详细信息

通过氮掺杂TiO_(2)(N-TiO_(2))浸渍蜂窝过滤器构建了一系列原型光催化空气净化器(AP(N_(x)-C_(y)))系统,并用于在UV-LED光(1 W)照射条件下光催化分解0.5-5 ppm甲醛(Ch_(2)O)蒸汽.在上述催化过滤器系统中,Nx和Cy分别代表N/Ti摩尔比(0-20)和N-TiO_(2)浓度(2-20 mg mL^(-1)).光催化分解实验结果表明,AP(N_(10)-C_(10))的性能最好,其催化Ch2O转化为CO_(2)的转化率最高,循环反应10次后CO_(2)产率仍达到89.2%,在干燥空气中的清洁空气输送速率为9.45 L min^(-1).N10-C10的电荷载流子寿命(τa:1.70 ns)优于其他样品(如纯TiO_(2)的电荷载流子寿命为1.37 ns),这表明N缺陷(No)有助于降低带隙(3.10 eV)和产生氧空位OVs-Ti^(3+),这与密度泛函理论(DFT)模拟结果一致.采用原位漫反射红外傅里叶变换、电子顺磁共振和DFT分析等多种方法研究了Ch_(2)O的光催化氧化途径.结果表明,氧化过程涉及多个能量有利的中间步骤(例如Ch2O以Ch_(2)O_(2)的形式在TiO_(2)-OV{110}表面的桥连O/Oh基团上发生放热共价吸附,随后通过催化脱氢/氧化反应直接生成CO_(2):Ch_(2)O_(2)/hCOO^(-)+•Oh→h_(2)O+CO_(2)).这些步骤与具有N杂质的{101}表面上化学活性Ti原子的态密度计算结果一致.预计No缺陷和OVs的存在将通过降低活化能垒来影响反应能量和中间产物,从而在加湿条件下实现有效的矿化.综上,本文为设计和构建先进的光催化系统,并用于环境空气中醛类挥发性有机物(VOCs)的有效矿化提供了新思路.

关键词：光催化蜂窝过滤器甲醛氮掺杂TiO_(2) 密度泛函理论计算催化反应途径空气净化

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Electrooxidation of methanol and ethanol on carbon electrodeposited Ni–MgO nanocomposite

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Chinese Journal of Catalysis 2016年第4期37卷 616-627页

作者： h. B. hassana Z. Abdel hamid Rabab M. El-sherif 开罗大学理学院化学系埃及吉萨冲央冶金研究开发研究所埃及开罗

Ni–MgO nano‐composites were prepared on carbon anodes by electrodeposition from a nickel Watts bath in the presence of fine MgO reinforcement particles. Their performance as electrocata‐lysts for the oxidation of methanol and ethanol in alkaline medium was investigated and compared with that of carbon coated pure Ni （Ni/C）. The chemical composition, phase structure, and surface morphology of the deposited nano‐composites were studied by energy dispersive X‐ray spectros‐copy, X‐ray diffractometry, and scanning electron microscopy, respectively. Different electrochemi‐cal techniques were used to estimate the catalytic activity of the prepared electrocatalyst anodes, including cyclic voltammetry （CV）, chronoamperometry, and electrochemical impedance spectros‐copy （EIS）. The Ni/C electrocatalyst alone exhibited remarkably low catalytic activity and poor stability toward the electrooxidation process. The inclusion of MgO significantly promoted the cata‐lytic activity of the Ni catalyst for the alcohol electrooxidation and enhanced its poisoning re‐sistance. The EIS results confirmed those of CV and revealed a lower charge transfer resistance and enhanced roughness for the Ni–MgO/C nano‐composite electrodes compared with those of Ni/C.

关键词： Nickel-modified manganese oxide Electrooxidation Methanol Ethanol Electrochemical impedance spectroscopy Cyclic voltammetry

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Medical Image Compression Based on Wavelets with Particle Swarm Optimization

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Computers, Materials & Continua 2021年第5期67卷 1577-1593页

作者： Monagi h.Alkinani E.A.Zanaty sherif M.Ibrahim Department of Computer Science and Artificial Intelligence Faculty of Computer Science and EngineeringUniversity of JeddahJeddahSaudi Arabi Department of Computer Science Faculty of Computers and InformationSohag UniversitySohagEgypt Department of Computer Science and Mathematics Faculty of ScienceSouth Valley UniversityQenaEgypt

This paper presents a novel method utilizing wavelets with particle swarm optimization(PSO)for medical image *** method utilizes PSO to overcome the wavelets discontinuity which occurs when compressing images using *** transfers images into subband details and approximations using a modified haar wavelet(MhW),and then applies a *** is applied for selecting a particle assigned to the threshold values for the *** positions assigned to particles values are used to represent *** particle updates its position depending on the global best position(gbest)(for all details subband)and local best position(pbest)(for a subband).The fitness value is developed to terminate PSO when the difference between two local best(pbest)successors is smaller than a prescribe *** experiments are applied on five different medical image types,i.e.,MRI,CT,and *** show that the proposed algorithm can be more preferably to compress medical images than other existing wavelets techniques from peak signal to noise ratio(PSNR)and compression ratio(CR)points of views.

关键词： Image compression wavelets haar wavelet particle swarm algorithm medical image compression PSNR and CR

high temperature oxidation behavior of aluminide on a Ni-based single crystal superalloy in different surface orientations

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Progress in Natural Science:Materials International 2014年第2期24卷 163-170页

作者： Fahamsyah h.Latief Koji Kakehi El-Sayed M.sherif Department of Mechanical Engineering Tokyo Metropolitan University Center of Excellence for Research in Engineering Materials (CEREM) Advanced Manufacturing Institute King Saud University Electrochemistry and Corrosion Laboratory Department of Physical Chemistry National Research Centre (NRC)

An investigation on oxidation behavior of coated Ni-based single crystal superalloy in different surface orientations has been carried out at1100 ℃. It has been found that the {100} surface shows a better oxidation resistance than the {110} one, which is attributed that the {110}surface had a slightly higher oxidation rate when compared to the {100} surface. The experimental results also indicated that the anisotropic oxidation behavior took place even with a very small difference in the oxidation rates that was found between the two surfaces. The differences of the topologically close packed phase amount and its penetration depth between the two surfaces, including the ratio of α-Al2O3 after 500 h oxidation, were responsible for the oxidation anisotropy.

关键词： Ni-based superalloy Oxidation behavior Microstructure Aluminide coating Crystallographic orientation

Tailoring nanocomposite membranes of cellulose acetate/silica nanoparticles for desalination

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Journal of Materiomics 2022年第6期8卷 1122-1130页

作者： Amira S.Mohammed Ali Moataz M.Soliman sherif h.Kandil Shaker Ebrahim Marwa Khalil Materials Science Department Institute of Graduate Studies and Research(IGSR)Alexandria University163 Horrya AvenueEl-ShatbyP.O.Box 83221526AlexandriaEgypt Nanotechnology and Composite Materials Department Advanced Technology and New Materials Research InstituteCity of Scientific Research and Technological Applications(SRTA-City)P.O.Box 21934New Borg El Arab CityAlexandriaEgypt

herein, the fabrication of cellulose acetate (CA) silica-based nanocomposite membranes via the dry-wetphase inversion procedure for water desalination was investigated. The modified and unmodified silicananoparticles (MSNPs and SNPs) were prepared by the sol-gel technique. The effect of the SNPs andMSNPs was investigated on the CA membrane's properties and their performance for water *** CA nanocomposite membranes were characterized to study their structure, hydrophilicity, andmorphology. The fabricated nanocomposite membranes showed hydrophilic surface properties. Theperformance of reverse osmosis (RO) membranes was measured using a crossflow RO unit at 10 bar(1 bar = 0.1 MPa). The membrane with 10 mg of SNPs enhanced permeate water flux compared to thepristine CA membrane by 1.6 L/(m2·h). The effect of MSNPs on the nanocomposites' performance waslower than their counterpart in the case of adding SNPs. The membrane with 30 mg of MSNPs showedthe highest permeate water flux among other nanocomposite membranes with a value oAQSf 35.7 L/(m2·h)at 24 bar.

关键词： Silica nanoparticles Amino-modified silica Cellulose acetate Nanocomposite membrane Water desalination Reverse osmosis

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

Thrust characteristics of nano-carbon/Al/oxygenated salt nanothermites for micro-energetic applications

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Defence Technology（防务技术） 2023年第12期30卷 55-69页

作者： Ahmed Fahd Alex Baranovsky Charles Dubois Jamal Chaouki sherif Elbasuney Shady Shokry Chemical Engineering Department Ecole Polytechnique de MontrealMontrealH3C 3A7Canada Energetic Materials and Nanotechnology Research Center Technical Research CenterCairo11765Egypt Mechanical and Mechatronics Engineering Department University of WaterlooOntarioN2L 3G1Canada head of Nanotechnology Research Center Military Technical CollegeCairo11767Egypt Laser and Optoelectronics Research Center Technical Research CenterCairo11765Egypt

Combustion within small motors is key in the application-specific development of nanothermite-based micro-energetic systems. This study evaluates the performance of nanothermite mixtures in a converging-diverging nozzle and an open tube. Mixtures were prepared using nano-aluminum(n-Al),potassium perchlorate(KClO_(4)), and different carbon nanomaterials(CNMs) including graphene-oxide(GO), reduced GO, carbon nanotubes(CNTs) and nanofibers(CNFs). The mixtures were packed at different densities and ignited by laser beam. Performance was measured using thrust measurement,high-speed imaging, and computational fluid dynamics modeling, respectively. Thrust, specific impulse(ISP), volumetric impulse(ISV), as well as normalized energy were found to increase notably with CNM content. Two distinctive reaction regimes(fast and slow) were observed in combustion of low and high packing densities(20% and 55%TMD), respectively. Total impulse(IFT) and ISPwere maximized in the 5%GO/Al/KClO_4 mixture, producing 7.95 m N·s and 135.20 s respectively at 20%TMD, an improvement of 57%compared to a GO-free sample(5.05 m N·s and 85.88 s). CFD analysis of the motors over predicts the thrust generated but trends in nozzle layout and packing density agree with those observed experimentally;peak force was maximized by reducing packing density and using an open tube. The numerical force profiles fit better for the nozzle cases than the open tube scenarios due to the rapid nature of combustion. This study reveals the potential of GO in improving oxygenated salt-based nanothermites,and further demonstrates their applicability for micro-propulsion and micro-energetic applications.

关键词： Nanothermites Graphene oxide Reduced graphene oxide Carbon nano material Oxygenated salts Laser ignition Computational fluid dynamics

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Robust and high Accuracy Algorithm for Detection of Pupil Images

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Computers, Materials & Continua 2022年第10期73卷 33-50页

作者： Waleed El Nahal hatim G.Zaini Raghad h.Zaini sherif S.M.Ghoneim Ashraf Mohamed Ali hassan Electronics and Communications Engineering Department Faculty of EngineeringMSA UniversityCO12585Egypt Computer Engineering Department College of Computer and Information TechnologyTaif UniversityTaif21944Saudi Arabia Faculty of health and Rehabilitation Sciences Princess Nourah bint Abdulrahman UniversityRiyadhSaudi Arabia Department of Electrical Engineering College of EngineeringTaif UniversityTaif21944Saudi Arabia Electronics and Communications Engineering Department Faculty of EngineeringSinai UniversityArishCO45511Egypt

Recently,many researchers have tried to develop a robust,fast,and accurate *** algorithm is for eye-tracking and detecting pupil position in many applications such as head-mounted eye tracking,gaze-based human-computer interaction,medical applications(such as deaf and diabetes patients),and attention *** real-world conditions challenge the eye appearance,such as illumination,reflections,and *** the other hand,individual differences in eye physiology and other sources of noise,such as contact lenses or *** present work introduces a robust pupil detection algorithm with and higher accuracy than the previous attempts for real-time analytics *** proposed circular hough transform with morphing canny edge detection for Pupillometery(ChMCEP)algorithm can detect even the blurred or noisy images by using different filtering methods in the pre-processing or start phase to remove the blur and noise and finally the second filtering process before the circular hough transform for the center fitting to make sure better *** performance of the proposed ChMCEP algorithm was tested against recent pupil detection *** and results show that the proposed ChMCEP algorithm achieved detection rates of 87.11,78.54,58,and 78 according to´Swirski,ExCuSe,Else,and labeled pupils in the wild(LPW)data sets,*** results show that the proposed approach performs better than the other pupil detection methods by a large margin by providing exact and robust pupil positions on challenging ordinary eye pictures.

关键词： Pupil detection eye tracking pupil edge morphing techniques eye images dataset