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Frontiers of physics 2021年第5期16卷 173-182页

作者： Yunliang Liu Peiji Deng Ruqiang Wu ramadan a.geioushy Yaxi Li Yixian Liu Fengling Zhou Haitao Li Chenghua Sun Institute for Energy Research School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang212013China Nanomaterials and Nanotechnology Department Advanced Materials DivisionCentral Metallurgical R&D Institute(CMRDI)P.O.Box87 Helwan11421CairoEgypt College of Chemical Engineering and Energy Technology Dongguan University of TechnologyDongguan523808China Guangxi Key Laboratory of Electrochemical Energy Materials Guangxi UniversityNanning530004China Faculty of Science Engineering&TechnologySwinburne University of TechnologyVictoria3122Australia Faculty of Engineering The University of SydneySydneyAustralia

The large-scale production of ammonia mainly depends on the Haber-Bosch process,which will lead to the problems of high energy consumption and carbon dioxide *** nitrogen fixation is considered to be an environmental friendly and sustainable process,but its efficiency largely depends on the activity and stability of the ***,it is imperative to develop high-efficient electrocatalysts in the field of nitrogen reduction reaction(NRR).In this paper,we developed a BiVO_(4)/TiO_(2) nanotube(BiVO_(4)/TNT)heterojunction composite with rich oxygen vacancies as an electrocatalytic NRR *** heterojunction interface and oxygen vacancy of BiVO_(4)/TNT can be the active site of N2 dynamic activation and proton *** synergistic effect of TiO_(2) and BiVO_(4) shortens the proton transport path and reduces the over potential of chemical ***_(4)/TNT has high ammonia yield of 8.54µg·h^(−1)·cm^(−2) and high Faraday efficiency of 7.70%in−0.8 V *** in 0.1 M Na_(2)SO_(4) solution.

关键词： TiO_(2)nanotubes BiVO_(4) interface oxygen vacancy NRR

Gas diffusion in catalyst layer of flow cell for CO_(2) electroreduction toward C_(2+) products

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Nano Research 2024年第3期17卷 1101-1106页

作者： Xiqing Wang Qin Chen Yajiao Zhou Yao Tan Ye Wang Hongmei Li Yu Chen Mahmoud Sayed ramadan a.geioushy Nageh K.Allam Junwei Fu Yifei Sun Min Liu Hunan Joint International Research Center for Carbon Dioxide Resource Utilization School of Physics and ElectronicsCentral South UniversityChangsha 410083China School of Energy and Power Engineering Beihang UniversityBeijing 100191China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China Central Metallurgical Research and Development Institute(CMRDI) P.O.Box 87Helwan 11421CairoEgypt Energy Materials Laboratory School of Sciences and EngineeringThe American University in CairoNew Cairo 11835Egypt Research Center for Advanced Energy and Carbon Neutrality Beihang UniversityBeijing 100191China

The use of gas diffusion electrode(GDE)based flow cell can realize industrial-scale CO_(2) reduction reactions(CO_(2)RRs).Controlling local CO_(2) and CO intermediate diffusion plays a key role in CO_(2)RR toward multi-carbon(C_(2+))*** this work,local CO_(2) and CO intermediate diffusion through the catalyst layer(CL)was investigated for improving CO_(2)RR toward C_(2+)*** gas permeability tests and finite element simulation results indicated CL can balance the CO_(2) gas diffusion and residence time of the CO intermediate,leading to a sufficient CO concentration with a suitable CO_(2)/H_(2)O supply for high C_(2+)*** a result,an excellent selectivity of C_(2+)products~79%at a high current density of 400 mA·cm^(-2) could be obtained on the optimal 500 nm Cu CL(Cu500).This work provides a new insight into the optimization of CO_(2)/H_(2)O supply and local CO concentration by controlling CL for C_(2+)products in CO_(2)RR flow cell.

关键词： gas diffusion electrode CO_(2)reduction Cu mass transfer C_(2)product

Gut virome:New key players in the pathogenesis of inflammatory bowel disease

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World Journal of Methodology 2025年第2期15卷 27-43页

作者： Helal F Hetta Rehab Ahmed Yasmin N ramadan Hayam Fathy Mohammed Khorshid Mohamed M Mabrouk Mai Hashem Department of Medical Microbiology and Immunology Faculty of MedicineAssiut UniversityAssiut 71515Egypt Division of Microbiology Immunology and BiotechnologyFaculty of pharmacyUniversity of TabukTabuk 71491Saudi Arabia Division of Microbiology Immunology and BiotechnologyDepartment of Natural Products and Alternative MedicineFaculty of PharmacyUniversity of TabukTabuk 71491Saudi Arabia Department of Internal Medicine Division HepatogastroenterologyAssiut UniversityAssiut 71515Egypt Department of Clinical Research Egyptian Developers of Gastroenterology and Endoscopy FoundationCairo 11936Egypt Department of Internal Medicine Faculty of Medicine.Tanta UniversityTanta 31527Egypt Department of Tropical Medicine Gastroenterology and HepatologyAssiut University HospitalAssiut 71515Egypt

Inflammatory bowel disease(IBD)is a chronic inflammatory illness of the *** the mechanism underlying the pathogenesis of IBD is not fully under-stood,it is believed that a complex combination of host immunological response,environmental exposure,particularly the gut microbiota,and genetic suscept-ibility represents the major *** gut virome is a group of viruses found in great frequency in the gastrointestinal tract of *** gut virome varies greatly among individuals and is influenced by factors including lifestyle,diet,health and disease conditions,geography,and *** majority of research has focused on the significance of gut bacteria in the progression of IBD,although viral populations represent an important component of the *** conducted this review to highlight the viral communities in the gut and their expected roles in the etiopathogenesis of IBD regarding published research to date.

关键词： Inflammatory bowel disease Pathogenesis Gut virome Bacteriophage Eukaryotic viruses

URBAN PLANNING:A TOOL FOR URBAN POVERTY ALLEVIATION IN SUDAN

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Chinese Geographical Science 2004年第2期14卷 110-116页

作者： Elnazir ramadan Department of Urban and Resources Sciences Nangjing University Nanjing 210093. P. R. China Department of Geography University of Juba 321/1 Khartoum Sudann the past few dacades urbanization and urban growth have been increasing rapidly in many of the developing countries. It is expected that over 50% of the world population will live in cities in 2005. The growing trend indicates that as many as one fifth of all households still remain with housing tenure problems which they try to solve through very expensive rentals insecurity socially and environmentally-hazardous squatting or unhealthy overcrowding sometimes ending up with none at all. And hence propcr planning is necessary in urban development policies to improve human settlement managements in a sustainable way. This article has tried to handle urban poverty in the Sudan to a reasonable level of detail. It dealt with selected areas with regard to promotion of sustainable human settlement. The study managed to identity some recent progress in Sudanese human settlements that is however still accompanied by numerous serious instances of decline in the urban environment especially that of the greater Khartoum. Such instances of environmental deterioration are profiled and analyzed by the study with respect to all human settlement aspects of management land-use infrastructure energy and transport. The paper's conclusion emphasized that improving all these aspects is of high priority.

In the past few dacades, urbanization and urban growth have been increasing rapidly in many of the developing countries. It is expected that over 50% of the world population will live in cities in 2005. The growing trend indicates that as many as one fifth of all households still remain with housing tenure problems, which they try to solve through very expensive rentals, insecurity, socially and environmentally-hazardous squatting or unhealthy overcrowding, sometimes ending up with none at all. And hence, proper planning is necessary in urban development policies to improve human settlement managements in a sustainable way. This article has tried to handle urban poverty in the Sudan to a reasonable level of detail. It dealt with selected areas with regard to promotion of sustainable human settlement. The study managed to identity some recent progress in Sudanese human settlements, that is, however, still accompanied by numerous serious instances of decline in the urban environment, especially that of the greater *** instances of environmental deterioration are profiled and analyzed by the study with respect to all human settlement aspects of management, land-use, infrastructure, energy and transport. The paper's conclusion emphasized that improving all these aspects is of high priority.

关键词：城市规划贫困经济发展苏丹

Inelastic displacement ratio of low-to mid-rise BRBFs designed under variable levels of seismicity

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Earthquake Engineering and Engineering Vibration 2023年第3期22卷 763-775页

作者： Hamdy Abou-Elfath Mostafa ramadan Faculty of Engineering Alexandria UniversityAlexandria 21544Egypt

Buckling-restrained braces(BRBs)have shown their capability to provide building structures with stiffness,strength,and *** the seismic drifts of buckling-restrained braced frames(BRBFs)is an important design step to control structural and non-structural *** current practice of seismic design,the estimation of seismic drifts of BRBFs is performed by using empirical calculations that are independent upon either the type of the structural system or the design level of *** these empirical calculations,the seismic drifts are estimated by amplifying the reduced elastic drifts obtained under design lateral loading with a displacement amplification factor(DAF).The value of DAF is considered equal to the product of the response modification factor R and the inelastic displacement ratioρ.The goal of the current research is to assess the value ofρfor low-to mid-rise BRBFs designed under low and high levels of *** goal has been achieved by conducting a series of elastic and inelastic time-history analyses pertaining to an ensemble of earthquake records on 3-,6-and 9-story *** results indicate that theρ-ratio increases with an increase in design seismic intensity and an increase in experienced *** range ofρfor low seismicity designs ranges from 0.63 to 0.9,while for high seismicity designs this range stretches from 0.83 to *** has been found that the consideration of a generalρ-ratio of 1.0 is a reasonable estimation for the design of the BRBFs considered in this study.

关键词： displacement amplification factor inelastic displacement ratio seismicity buckling-restrained brace seismic drift seismic design

Friction and wear of sand-contaminated lubricated sliding

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Friction 2018年第4期6卷 457-463页

作者： Mohamed Ahmed ramadan Faculty of Engineering at Helwan Helwan University

This paper reports a test investigation of friction and wear responses from sand contaminated lubricated sliding. The influence of sand contaminants on wear and friction is characterized. Analyses are completed utilizing segments of piston ring sliding against the cylinder liner. Paraffin oil, with and without sand contaminants, is utilized. The effects of the concentration and particle size of sand are examined. Based on the observations in the present work, we found that friction and wear increase with sand concentration in the lube. Solid proposals ought to be considered, in order to enlighten the general population on the importance of changing a car engine's oil filter regularly.

关键词： sand contamination lubrication oil abrasive wear lubricated sliding

Hyoscine N-butylbromide inhalation:they know,how about you?

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World Journal of Emergency Medicine 2023年第1期14卷 81-82页

作者： Hayri ramadan Department of Emergency Medicine Ankara Training and Research HospitalUniversity of Health SciencesAnkara 06230Turkey

Dear editor,Hyoscine N-butylbromide(HNB)is a quaternary ammonium compound with an anticholinergic effect and is commonly used as an antispasmodic drug.[1,2]HNB decreases motility in the gastrointestinal and genitourin... 详细信息

关键词： editor quaternary ammonium

A survey of recent interactive image segmentation methods

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Computational Visual Media 2020年第4期6卷 355-384页

作者： Hiba ramadan Chaymae Lachqar Hamid Tairi Department of Informatics Faculty of Sciences Dhar El MahrazUniversity of Sidi Mohamed Ben AbdellahFez 30000Morocco Faculty of Medicine and Pharmacy University of Sidi Mohamed Ben AbdellahFez 30000Morocco

Image segmentation is one of the most basic tasks in computer vision and remains an initial step of many applications. In this paper, we focus on interactive image segmentation(IIS), often referred to as foreground–background separation or object extraction, guided by user interaction. We provide an overview of the IIS literature by covering more than 150 publications, especially recent works that have not been surveyed before. Moreover, we try to give a comprehensive classification of them according to different viewpoints and present a general and concise comparison of the most recent published works. Furthermore, we survey widely used datasets,evaluation metrics, and available resources in the field of IIS.

关键词： interactive image segmentation user interaction label propagation deep learning superpixels

Assessing the lifetime performance index of weighted Lomax distribution based on progressive type-Ⅱ censoring scheme for bladder cancer

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International Journal of Biomathematics 2021年第4期14卷 49-66页

作者： Dina A.ramadan Department of Mathematics Faculty of Science Mansoura UniversityMansouraEgypt

In this paper,Health-related quality of life has not been adequately measured in bladder cancer.A recently developed reliable and disease-specific quality of life instrument(Bladder Cancer Index,RCI)was used to *** type Ⅱ censoring schemes have potential usefulness in practice where budget constraints in place or there is a necessity for the speedy *** test the process capability,the lifetime performance index Cl is widely recommended for evaluating the performance of the producfs lifetime and evaluating the lifetime performance index GL for the three-parameter Weighted-Lomax distribution(WLx)under progressive type-II censoring sample for a lower specification limit(L).The statistical inference concerning CL is conducted via obtaining the maximum likelihood of Cl on the base of progressive type-II *** asymptotic normal distribution of the MLE of CL and the confidence interval is ***,the hypothesis testing of CL for evaluating the lifetime performance of WLx data is ***,assuming the conjugate prior distribution and squared error loss function,this study constructs a Bayes estimator of *** Bayes estimator of CL is then utilized to develop a credible interval in the condition of known ***,we propose a Bayesian test to assess the lifetime performance of *** also propose a Bayesian test to assess the lifetime performance of ***,two examples are given,one of them is considering a real life data of the remission times of bladder cancer patients in endurance lifetime test and the other is a simulated example to illustrate the usage of the proposed procedure.

关键词： Lifetime performance index Weighted-Lomax distribution progressively type-II right censoring

Comparative Study of Different Decoupling Schemes for TITO Binary Distillation Column via PI Controller

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IEEE/CAA Journal of Automatica Sinica 2018年第4期5卷 869-877页

作者： Mohamed Hamdy Abdalhady ramadan Belal Abozalam Industrial Electronics and Control Engineering Department Faculty of Electronic EngineeringMenoufia UniversityMenouf-23952Egypt Badr Petroleum Company(BAPETCO) CairoEgypt

This paper presents a comparative study of different decoupling control schemes for a two-input, two-output(TITO) binary distillation column via proportional-integral(PI)controller. The key idea behind this paper is designing two novel fuzzy decoupling schemes that depend on human knowledge,instead of the system mathematical model used in conventional decoupling schemes. Based on conventional and inverted decoupling schemes, fuzzy and inverted fuzzy decoupling schemes are developed. The control effect is compared using simulation results for the proposed two schemes with conventional decoupling and inverted decoupling. The proposed fuzzy decoupling schemes are easy to realize and simple to design, besides they have a good decoupling capability. Two methods are used to prove asymptotic stability of each loop and the entire closed-loop system by applying the proposed fuzzy decoupling-based PI *** Wood and Berry model of a binary distillation column is used to illustrate the applicability of the proposed schemes.

关键词： Binary distillation column conventional decoupling fuzzy decoupling proportional-integral(PI) controller stability analysis