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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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Prospect of Animal Models for Acute-on-chronic Liver Failure:A Mini-review

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Journal of Clinical and Translational Hepatology 2022年第5期10卷 995-1003页

作者： Hozeifa mohamed hassan Jun Li Precision Medicine Center Taizhou Central Hospital(Taizhou University Hospital)TaizhouZhejiangChina State Key Laboratory for Diagnosis and Treatment of Infectious Diseases National Clinical Research Center for Infectious DiseasesNational Medical Center for Infectious DiseasesCollaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesThe First Affiliated HospitalZhejiang University School of MedicineHangzhouZhejiangChina

Acute-on-chronic liver failure(ACLF)is a clinical syndrome that develops in patients with chronic liver diseases following a precipitating event and associated with a high mortality rate due to systemic multiorgan *** a suitable and stable animal model to precisely elucidate the molecular basis of ACLF pathogenesis is essential for the development of effective early diagnostic and treatment *** this context,this article provides a concise and inclusive review of breakthroughs in ACLF animal model development.

关键词： Liver failure Acute-on-chronic liver failure Animal model Hepatotoxicants Inflammation

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Free radical scavenging activity of three different flowers-Hibiscus rosa-sinensis,Quisqualis indica and Senna surattensis

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Asian Pacific Journal of Tropical Biomedicine 2016年第9期6卷 771-777页

作者： Abd El-Moneim mohamed Radwan Afify Hazem mohamed Mahmoud hassan Biochemistry Department Faculty of AgricultureCairo University

Objective:To evaluate three flowers of Hibiscus rosa-sinensis(***-sinensis),Quisqualis indica(***) and Senna surattensis(***) for their antioxidant activity by different methods in addition to total phenolic,flavonoid and pigment ***:Antioxidant activity of water,ethanol and absolute ethanol extracts of three flowers; ***-sinensis,*** and *** was *** antioxidant activity was assessed by 1,1-diphenyl-2-picrylhydrazyl free radical scavenging activity,ferrous chelating activity,reducing power,nitric oxide scavenging activity,hydroxyl radical scavenging activity as well as total antioxidant *** flavonoids,total phenols and total pigments including chlorophylls and carotenoids were measured for the three ***:The results showed that the highest total antioxidant capacity at concentration of 500 mg/L was found in *** as 0.479 ± *** activity of ***,*** and *** flower extracts against 1,1-diphenyl-2-picrylhydrazyl radical showed the highest activity of(90.20 ± 0.29)% with 500 mg/*** screening of the three flowers extracts were carried out for alkaloids,flavonoids,saponins,tannins,steroids,glycosides,terpenoids,amino acid and ***-sinensis showed the total phenolic in water extract of(235.77 ± 14.31) mg/100 g,the other two flowers *** and *** had the total phenolic in ethanol extracts of(937.70 ± 25.06) and(850.30 ± 13.81) mg/100 g,*** the other hand total flavonoids were identified in absolute ethanol extracts in the three flowers[(32.83 ± 1.34),(49.24 ± 4.87) and(2.79 ± 0.23) mg/100 g,respectively].Conclusions:The extracts in the constituents of the three flowers could be used as additives as supplement fractions in foods.

关键词： Free radical Antioxidant Hibiscus rosa-sinensis Quisqualis indica Senna surattensis

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Computer programming for prediction of soil bulk density effect on trencher design parameters

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International Journal of Agricultural and Biological Engineering 2011年第4期4卷 42-49页

作者： mohamed hassan Dahab Moayed mohamed balal Department of Agricultural Engineering Faculty of AgricultureShambatUniversity of KhartoumSudan Department of Agricultural Engineering Faculty of Natural Resources and Environmental StudiesElobiedUniversity of North KordofanSudan

A computer program was developed in C++language to predict the effect of soil bulk density on draft force on bottoms,share thickness,stresses distribution and maximum deflection on standards,bending stresses distribution on side plates,diameter of shear pins,and tensile stress on hitch *** was found that,as soil bulk density increased,stresses distribution and maximum deflection on standards,bending stresses distribution on side plates,diameter of shear pins,and tensile stress on hitch bar *** diameter of shear pin should be larger to meet wide range of soil density.

关键词： trencher computer program soil draft force bulk density prediction

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Modeling and Optimization of Surface Roughness of Epoxy/Nanoparticles Composite Coating

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Computers, Materials & Continua 2022年第4期71卷 71-83页

作者： A.F.mohamed J.Abu Alsoud Mujahed Al-Dhaifallah Hegazy Rezk mohamed K.hassan Department of Mechanical Engineering College of Engineering&Islamic Arch.Umm Alqura UniversityMakkahSaudi Arabia Department of Mechanical Engineering Faculty of EngineeringSohag UniversitySohagEgypt Department of Systems Engineering King Fahd University of Petroleum&MineralsDhahran31261KSA College of Engineering at Wadi Addawaser Prince Sattam Bin Abdulaziz UniversityAl-Kharj11911Saudi Arabia Department of Electrical Engineering Faculty of EngineeringMinia UniversityMinia61517Egypt Department of Production Engineering and Design Faculty of EngineeringMinia UniversityMinia61517Egypt

In power plants,flue gases can cause severe corrosion damage in metallic parts such as flue ducts,heat exchangers,and *** is an effective technique to prevent this damage.A robust fuzzy model of the surface roughness(Ra and Rz)of flue gas ducts coated by protective composite coating from epoxy and nanoparticles was constructed based on the experimental *** proposed model consists of four nanoparticles(ZnO,ZrO2,SiO2,and NiO)with 2%,4%,6%,and 8%,*** surface methodology(RSM)was used to optimize the process parameters and identify the optimal conditions for minimum surface roughness of this coated *** prove the superiority of the proposed fuzzy model,the model results were compared with those obtained by ANOVA,with the coefficient of determination and the root-mean-square error(RMSE)used as *** Ra,for the first output response,using ANOVA,the coefficient-of-determination values were 0.9137 and 0.4037,respectively,for training and ***,for Rz,the second output response,the coefficient-of-determination results were 0.9695 and 0.4037,respectively,for training and *** the fuzzy modeling of Ra,for the first output response,the RMSE values were 0.0 and 0.1455,respectively,for training and *** values for the coefficient of determination were 1.00 and 0.9807,respectively,for training and *** results prove the superiority of fuzzy *** modeling the second output response Rz,the RMSE values were 0.0 and 0.0421,respectively,for training and testing,and the coefficient-of-determination values were 1.00 and 0.9959,respectively,for training and testing.

关键词： Materials coating nanoparticles modeling and optimization

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Epidemiology of viral hepatitis in Somalia:Systematic review and meta-analysis study

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World Journal of Gastroenterology 2018年第34期24卷 3927-3957页

作者： mohamed Abdulkadir hassan-Kadle Mugtaba Sulaiman Osman Pavel Petrovich Ogurtsov Department of Hospital Medicine Peoples’Friendship University of Russia(RUDN University)Moscow 117198Russia Abrar Research and Training Center Abrar UniversityDepartment of Internal MedicineDivision of Gastroenterology and HepatologyDufle Specialist HospitalMogadishu 25Somalia Department of Psychiatry School of MedicineRoyal College of Surgeons in Ireland RCSIBeaumont HospitalDublin 9Ireland

AIM To provide a clear understanding of viral hepatitis epidemiology and their clinical burdens in *** A systematic review and meta-analysis was conducted as Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. A comprehensive literature search of published studies on viral hepatitis was performed from 1977-2016 in Pub Med, Google Scholar, Science Direct, World Health Organization African Index Medicus and the Africa Journals Online databases, as well as on the Ministry of Health website. We also captured unpublished articles that were not available on online *** Twenty-nine studies from Somalia and Somali immigrants(United Kingdom,United States,Italy,Libya)with a combined sample size for each type of viral hepatitis[hepatitis A virus(HAV):1564,hepatitis B virus(HBV):8756,hepatitis C virus(HCV):6257,hepatitis D virus(HDV):375 and hepatitis E virus(HEV):278]were *** overall pooled prevalence rate of HAV was 90.2%(95%CI:77.8%to 96%).The HAV prevalence among different age groups was as follows:40 years old,86.96%(95%CI:75.68%to 93.47%).The overall pooled prevalence of HBV was 18.9%(95%CI:14%to 29%).The overall pooled prevalence among subgroups of HBV was20.5%(95%CI:5.1%to 55.4%)in pregnant women;5.7%(95%CI:2.7%to 11.5%)in children;39.2%(95%CI:33.4%to 45.4%)in patients with chronic liver disease,including hepatocellular carcinoma(HCC);7.7%(95%CI:4.2%to 13.6%),12.4%(95%CI:6.3%to 23.0%)and 11.8%(95%CI:5.3%to 24.5%)in age groups40years old,*** HBV prevalence among risk groups was 20%(95%CI:7.19%to 44.64%)in female prostitutes,21.28%(95%CI:7.15%to48.69%)in hospitalized adults,5.56%(95%CI:0.99%to 25.62%)in hospitalized children,60%(95%CI:31.66%to 82.92%)in patients with acute hepatitis,33.55%(9

关键词： Viral hepatitis Hepatitis A virus Hepatitis B virus Hepatitis C virus Hepatitis D virus Hepatitis E virus Systematic review Meta-analysis,Somalia

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Investigating energy policies to boost grid-connected rooftop solar PV in Sudan

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Clean Energy 2023年第5期7卷 994-1005页

作者： Tarig Z.Ahmed Ayah mohamed Mawahib Eltayeb Ahmed Ahmed Osman Elamin Abdalgader mohamed G.hassan-Sayed Cambridge Institute for Sustainability Leadership(CISL) University of CambridgeCambridgeCB21QAUK Energy and Climate Change Division Faculty of Engineering and Physical ScienceThe University of SouthamptonSouthamptonSO171BJUK Institute of Engineering Research and Material Technology National Centre for ResearchKhartoumSudan/University of KhartoumSudan University of California Davis1 Shields AveDavisCA 95616USA School of Chemistry Faculty of Engineering and Physical SciencesThe University of SouthamptonSouthamptonSO171BJUK

Grid-connected rooftop solar photovoltaic(PV)systems can reduce the energy demand from the grid and significantly increase the power available to ***,rooftop solar PV has not yet been widely adopted in many sub-Saharan African countries,such as Sudan,although they are endowed with high solar radiation and in dire need of additional *** paper investigates risks and policies to increase grid-connected rooftop solar PV adoption in Sudan.A simplified United Nations Development Program Derisking Renewable Energy Investment framework is adopted to investigate this over three *** Stage 1,a list of risks and barriers was produced based on a literature review of solar PV studies in Sudan and interviews with nine *** was the risk most often mentioned(eight times from nine interviewees),followed by concerns about poor utility grid *** Stage 2,policy de-risking instruments and financial de-risking instruments were listed to overcome the *** include the intro-duction of net metering,the use of a third-party organization to monitor policy implementation,upgrade of the grid infrastructure,public awareness campaigns and energy-saving *** Stage 3,the levelized cost of electricity was estimated for a typical 2-kW rooftop PV system without policies(0.11$/kWh)and with a net-metering policy(0.07$/kWh).

关键词： energy policy rooftop solar PV Sudan energy poverty sustainable development photovoltaics

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A new technique for fault diagnosis in transformer insulating oil based on infrared spectroscopy measurements

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High Voltage 2024年第2期9卷 319-335页

作者： mohamed M.F.Darwish mohamed H.A.hassan Nagat M.K.Abdel-Gawad Matti Lehtonen Diaa-Eldin A.Mansour Department of Electrical Engineering Faculty of Engineering at ShoubraBenha UniversityCairoEgypt Department of Electrical Engineering and Automation School of Electrical EngineeringAalto UniversityEspooFinland Department of Electrical Power Engineering Egypt-Japan University of Science and Technology(E-JUST)New Borg El-Arab CityEgypt Department of Electrical Power and Machines Engineering Faculty of EngineeringTanta UniversityTantaEgypt

Condition monitoring of the insulating system within power transformers has a massive importance according to the electrical *** gas analysis(DGA)is frequently used for this ***,DGA lacks the necessary level of accuracy to identify all equipment faults,particularly in their initial stages of ***,it does not have the capability for real-time monitoring and relies on manual sampling and laboratory testing,causing potential delays in fault ***,the interpretation of DGA data necessitates specialised expertise,which may pose difficulties for smaller entities that have limited access to ***,the contribution of this research is to use infrared spectroscopy measurements as a new effective technique substituting the DGA method for fault diagnosis in insulating *** inception faults that were considered in this study were the electrical fault(discharges of high energy)and the thermal fault(300°C

关键词： fault diagnosis spectroscopy

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A Comparative Study on Punitive Damages in IP Law between China and the US

A Comparative Study on Punitive Damages in IP Law between Ch...

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作者： mohamed Abdulatti Ibrahim hassan 华东政法大学

学位级别：硕士

在中国知识产权法关于惩罚性赔偿的相关法律修改及司法解释之后,惩罚性赔偿成为最近提出的最重要的话题之一。这些修订对于中国在过去二十年外国投资引入的背景下,保持经济发展和快速增长至关重要。对中国而言,这一发展还需要在法律和... 详细信息

在中国知识产权法关于惩罚性赔偿的相关法律修改及司法解释之后,惩罚性赔偿成为最近提出的最重要的话题之一。这些修订对于中国在过去二十年外国投资引入的背景下,保持经济发展和快速增长至关重要。对中国而言,这一发展还需要在法律和立法上采取行动,切实保护投资者的权利,并鼓励投资者增加在中国的投资。中国知识产权保护法的要点之一是无法保护发明所有者和商标所有者。这也是经济增长的一个重大障碍。中国知识产权法采用惩罚性赔偿制度传递的信息是,让投资者、资本家和发明所有者放心,他们有权使用和利用他们的发明,并在任何其他人违反的情况下保护自己的权利。对于受侵害的一方,诉诸法律之后,赔偿将在一定程度上弥补利润的损失。本文介绍了美国立法中的惩罚性赔偿制度以及该法在美国法院的适用情况,鉴于美国早就采用了惩罚性赔偿制度,通过介绍相关法律的发展和修订,以及司法解释和案件中的实践情况,来回顾该制度在美国立法中所经历的阶段。进而将其与中国立法中的惩罚性赔偿进行比较,再强调其在知识产权法应用方面限制和过度使用惩罚性赔偿存在的缺陷。并试图引出美国立法中的弱点和负面观点,进而增加对中国立法更准确的了解。规避了美国立法在惩罚性赔偿方面犯下的错误,进而提出更有价值的观点和评论。

关键词：惩罚性赔偿知识产权法商标法故意侵权

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Ballistic design and testing of a composite armour reinforced by CNTs suitable for armoured vehicles

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Defence Technology（防务技术） 2024年第2期32卷 173-195页

作者： Evangelos Ch.Tsirogiannis Evangelos Daskalakis mohamed H.hassan Abdalla M.Omar Paulo Bartolo EODH SA Research and Development DepartmentLakkoma Chalkidikis63080Greece School of Mechanical Aerospace and Civil EngineeringUniversity of ManchesterManchesterM139PLUK Singapore Centre for 3D Printing School of Mechanical and Aerospace EngineeringNanyang Technological University639798Singapore

This paper is investigating the use of composite armour reinforced by nanomaterials, for the protection of light armoured(LAV) and medium armoured military vehicles(MAV), and the interaction between the composite materials and high-performance ballistic projectiles. Four armour materials, consisted of front hybrid fibre reinforced polymer cover layer, ceramic strike-face, fibre reinforced polymer intermediate layer and the metal matrix composite reinforced backplate, were manufactured and assembled by adhesive technology. The proposed laminated protection system is suitable for armoured ground vehicles;however, it could be used as armour on ground, air and naval platforms. The design of the protection system, including material selection and thickness, was elaborated depending on the performance requirements of Level 4 + STANAG 4569 military standard(projectile 14.5 mm × 114 mm API B32) and especially on a design philosophy which is analysed with the specifications. The backplate of this new composite is a hybrid material of Metal Matrix Composite(MMC) reinforced with carbon nanotubes(CNTs), manufactured with the use of powder metallurgy technique. The composite backplate material was morphologically, mechanically and chemically analysed. Results show that all plates are presenting high mechanical properties and ballistic characteristics, compared to commonly used armour plates. Real military ballistic tests according to AEP-STANAG 4569 were carried out for the total composite armour systems. After the ballistic tests, AA2024-CNT3 showed the best protection results, compared with the other plates(AA2024-CNT1 and AA2024-CNT2), with the projectile being unable to fully penetrate the composite plate.

关键词： Passive armour protection Protective armour Ballistic performance Hybrid composites Vehicle protection

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