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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

Hydrogel-based catalysts for hydrogen generation by the hydrolysis of B–H compounds under external physical fields

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Journal of Energy Chemistry 2023年第11期86卷 518-535,I0011页

作者： Chunling Qin Wenliu Wu Hassanien gomaa Shuai Wu Cuihua An Qibo Deng Ning Hu Key Laboratory of Hebei Province on Scale-span Intelligent Equipment Technology School of Mechanical Engineeringand School of Materials Science and EngineeringHebei University of TechnologyTianjin 300401China State Key Laboratory of Reliability and Intelligence Electrical Equipment Hebei University of TechnologyTianjin 300130China Advanced Equipment Research Institute Co. Ltd.Of HEBUTTianjin 300401China

Hydrogen is a popular clean high-energy-density ***,its utilization is limited by the challenges toward low-cost hydrogen production and safe hydrogen ***,these issues can be addressed using promising hydrogen storage materials such as B–H *** stored in B–H compounds can be released by hydrolysis at room temperature,which requires catalysts to increase the rate of the ***,several effective approaches have been developed for hydrogen generation by catalyzing the hydrolysis of B–H *** review summarizes the existing research on the use of nanoparticles loaded on hydrogels as catalysts for the hydrolysis of B–H ***,the factors affecting the hydrolysis rate,such as temperature,p H,reactant concentration,and type of nano particles,were ***,the preparation methods(in situ reduction,one-pot method,template adsorption,etc.)for the hydrogel catalysts and the types of loaded catalysts were ***,the hydrogel catalysts that can respond to magnetic fields,ultrasound fields,optical fields,and other physical fields are ***,the issues and future developments of hydrogel-based catalysts are *** review can inspire deeper investigations and provide guidance for the study of hydrogel catalysts in the field of hydrogen production via hydrolysis.

关键词： Hydrogel Nanoparticlec atalyst B-H compounds Hydrolysis reaction External physical field

Pointwise Second-Order Necessary Conditions for Stochastic Optimal Control with Jump Diffusions

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Communications in Mathematics and Statistics 2023年第4期11卷 741-766页

作者： Abdelhak Ghoul mokhtar Hafayed Imad Eddine Lakhdari Shahlar Meherrem Laboratory of Mathematical Analysis Probabilities and OptimizationsUniversity of BiskraPo Box 14507000 BiskraAlgeria Department of Mathematics Yasar UniversityUniversity avenAgaclıYol No.35-57IzmirTurkey

In this paper,we establish a second-order necessary conditions for stochastic optimal control for jump *** controlled system is described by a stochastic differential systems driven by Poisson random measure and an independent Brownian *** control domain is assumed to be *** second-order maximum principle for controlled jump diffusion in terms of the martingale with respect to the time variable is *** proof of the main result is based on variational approach using the stochastic calculus of jump diffusions and some estimates on the state processes.

关键词： Optimal control Stochastic systems with jumps Pointwise second-order necessary condition Maximum principle Variational equation

Nonlinear Analysis of Organic Polymer Solar Cells Using Differential Quadrature Technique with Distinct and Unique Shape Function

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Computer Modeling in Engineering & Sciences 2023年第12期137卷 2193-2217页

作者： Ola Ragb mokhtar Mohamed Mohamed S.Matbuly Omer Civalek Department of Engineering Mathematics and Physics Faculty of EngineeringZagazig UniversityZagazig44519Egypt Basic Science Department Faculty of EngineeringDelta University for Science and TechnologyGamasa11152Egypt Department of Medical Research China Medical University HospitalChina Medical UniversityTaichung404327TaiwanChina

Four numerical schemes are introduced for the analysis of photocurrent transients in organic photovoltaic *** for organic polymer solar cells contains a nonlinear diffusion-reaction partial differential equation system with electrostatic convection attached to a kinetic ordinary differential *** solve the problem,Polynomial-based differential quadrature,Sinc,and Discrete singular convolution are combined with block marching *** schemes are employed to reduce the problem to a nonlinear algebraic *** iterative quadrature technique is used to solve the reduced *** obtained results agreed with the previous exact one and the finite element ***,the effects of different times,different mobilities,different densities,different geminate pair distances,different geminate recombination rate constants,different generation efficiencies,and supporting conditions on photocurrent have been *** novelty of this paper is that these schemes for photocurrent transients in organic polymer solar cells have never been presented before,so the results may be useful for improving the performance of solar cells.

关键词： Sinc differential quadrature block marching organic solar cells discrete singular convolution

Database Recovery Technique for Mobile Computing:A Game Theory Approach

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Computers, Materials & Continua 2022年第2期70卷 3205-3219页

作者： Magda M.Madbouly Yasser F.mokhtar Saad M.Darwish Institute of Graduate Studies and Research Alexandria UniversityAlexandriaEgypt Assistant General Manager IT DepartmentEgyptian Petrochemicals Co.AlexandriaEgypt

Contact between mobile hosts and database servers presents many problems in theMobile Database System(MDS).It is harmed by a variety of causes,including handoff,inadequate capacity,frequent transaction updates,and repeated failures,both of which contribute to serious issues with the information system’s ***,error tolerance technicality allows devices to continue performing their functions in the event of a *** aim of this paper is to identify the optimal recovery approach from among the available state-of-the-art techniques in MDS by employing game *** of the presented recovery protocols are chosen and evaluated in order to determine the most critical factors affecting the recovery mechanism,such as the number of processes,the time required to deliver messages,and the number of messages logged-in ***,using the suggested payout matrix,the game theory strategy is adapted to choose the optimum recovery technique for the specified environmental *** NS2 simulatorwas used to carry out the tests and apply the chosen recovery *** experiments validate the proposed model’s usefulness in comparison to other methods.

关键词： Mobile computing game theory decision making mobile database recovery

Performance of Gradient-Based Optimizer for Optimum Wind Cube Design

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Computers, Materials & Continua 2022年第4期71卷 339-353页

作者： Alaa A.K.Ismaeel Essam H.Houssein Amir Y.Hassan mokhtar Said Faculty of Computer Studies(FCS) Arab Open University(AOU)Muscat130Sultanate of Oman Faculty of Science Minia UniversityMiniaEgypt Faculty of Computers and Information Minia UniversityMiniaEgypt Electronics Research Institute GizaEgypt Electrical Engineering Department Faculty of EngineeringFayoum UniversityFayoumEgypt

Renewable energy is a safe and limitless energy source that can be utilized for heating,cooling,and other *** energy is one of the most important renewable energy *** fluctuation of wind turbines occurs due to variation of wind velocity.A wind cube is used to decrease power fluctuation and increase the wind turbine’s *** optimum design for a wind cube is the main contribution of this *** decisive design parameters used to optimize the wind cube are its inner and outer radius,the roughness factor,and the height of the wind turbine hub.A Gradient-Based Optimizer(GBO)is used as a new metaheuristic algorithm in this *** objective function of this research includes two parts:the first part is to minimize the probability of generated energy loss,and the second is to minimize the cost of the wind turbine and wind *** Gradient-Based Optimizer(GBO)is applied to optimize the variables of two wind turbine types and the design of the wind *** metrological data of the Red Sea governorate of Egypt is used as a case study for this *** on the results,the optimum design of a wind cube is achieved,and an improvement in energy produced from the wind turbine with a wind cube will be compared with energy generated without a wind *** energy generated from a wind turbine with the optimized cube is more than 20 times that of a wind turbine without a wind cube for all cases studied.

关键词： Wind turbine wind cube gradient-based optimizer metaheuristics energy source

The Transition of Belt and Road Initiative from 1.0 to 2.0:Challenges and Implications of Green Development

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Fudan Journal of the Humanities and Social Sciences 2023年第3期16卷 293-328页

作者： Rui Wang Khai Ern Lee Mazlin mokhtar Thian Lai Goh Institute for Environment and Development(LESTARI) Universiti Kebangsaan MalaysiaBangiMalaysia School of Management Guizhou University of CommerceGuiyangChina Jeffrey Sachs Center on Sustainable Development Sunway UniversitySunway CityMalaysia Sustainable Development Solutions Network(SDSN)Asia Sunway UniversitySunway CityMalaysia Faculty of Science and Technology Universiti Kebangsaan MalaysiaBangiMalaysia

China claims that the Belt and Road Initiative is a cross-regional comprehensive initiative covering the economy,social and environmental *** it was first proposed,it identified five main areas which call for cooperation priorities,*** coordination,interconnection of facilities,unimpeded trade,financial integration and people-to-people *** globally are focusing on the development of the Belt and Road Initiative as it has gone through several development *** Belt and Road Initiative initially focused on economic development,equal dialogue and cultural interchange between the Belt and Road Initiative partners and China,and now it has added the concept of green *** paper reviews the Belt and Road Initiative documents since 2013 and analyses the changes of environmental policies in the Belt and Road Initiative,aiming to identify the challenges and implications of green *** outcome of this paper provides insight into how the Belt and Road Initiative can contribute towards sustainable development with its partner countries.

关键词： China Belt and Road Initiative Environment Green development Sustainable development

Mechanism of Cluster Formation on Cerium Borosilicate Glasses Based on TEM-EDP and SEM-EDEX Investigations

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Journal of Minerals and Materials Characterization and Engineering 2022年第2期10卷 153-162页

作者： Salma Ahmeed gomaa El Damrawi Physics Department Sirte University Sirte Libya Physics Department Faculty of Science Mansoura University Mansoura Egypt

Cerium oxide has a great capacity to remove nonbridging oxygen atoms (NBO) from the glass network and serves as glass former units. The well formed CeO4 units played the role of decreasing NBO from the silicate network and cause a reduction in the concentration of tetrahedral boron groups (N4). The highest content of NBO in glass of lower CeO2 (1 mol%) has a dominant role in constructing crystalline clusters in the glass. Higher CeO2 concentration leads to formation of an amorphous glass network as documented by XRD and TEM-EDP spectra. Coordination of cerium with oxygen atoms gives uniform units of spherical morphology in the pure CeO2 as well as in cerium rich glass. Clustered species has a great benefit in the field of application, used as a shielding material for ionized radiations.

关键词： TEM-EDP SEM-EDEX Cluster Formation Cerium Borosilicate Glasses

Preserving Privacy of User Identity Based on Pseudonym Variable in 5G

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Computers, Materials & Continua 2022年第3期70卷 5551-5568页

作者： Mamoon M.Saeed Mohammad Kamrul Hasan Rosilah Hassan Rania mokhtar Rashid A.Saeed Elsadig Saeid Manoj Gupta Electrical Engineering Department Faculty of EngineeringAlzaiem Alazahri UniversityKhartoumSudan Center for Cyber Security Faculty of Information Science and TechnologyUniversiti KebangsaanMalaysia(UKM)43600BangiMalaysia Department of Computer Engineering College of Computers and Information TechnologyTaif UniversityPO Box 11099Taif21944Saudi Arabia Department of Electronics Engineering College of EngineeringSudan University of Science and TechnologyKhartoumSudan Department of Electronics and Communication Engineering JECRC UniversityJaipurIndia

The fifth generation(5G)system is the forthcoming generation of the mobile communication *** has numerous additional features and offers an extensively high data rate,more capacity,and low ***,these features and applications have many problems and issues in terms of security,which has become a great challenge in the telecommunication *** paper aimed to propose a solution to preserve the user identity privacy in the 5G system that can identify permanent identity by using Variable Mobile Subscriber Identity,which randomly changes and does not use the permanent identity between the user equipment and home *** this mechanism,the user identity privacy would be secured and ***,it improves the synchronization between mobile users and home ***,its compliance with the Authentication and Key Agreement(AKA)structure was adopted in the previous *** can be deployed efficiently in the preceding generations because the current architecture imposes minimal modifications on the network parties without changes in the authentication vector’s message ***,the addition of any hardware to the AKA carries minor adjustments on the network *** this paper,the ProVerif is used to verify the proposed scheme.

关键词： 5G privacy and security user identity IMSI authentication and key agreement(AKA)