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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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Quantitative Assessment of Building Constructability Using BIM and 4D Simulation

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Open Journal of Civil Engineering 2016年第3期6卷 442-461页

作者： Cheng Zhang tarek zayed Wissam Hijazi Sabah Alkass Department of Civil Engineering Xi’an Jiaotong-Liverpool University Suzhou China Department of Building Civil and Environmental Engineering Concordia University Montreal Canada Department of Engineering University of Sharja Sharjah United Arab Emirates

Despite the fact that applying constructability concepts in building designs have led to savings estimated within a range of 1% to 14% of the capital cost, the construction industry still lacks an advanced tool to assess and check for constructability implementations in designs. Therefore, the objective of this research is to propose a quantitative assessment of building constructability, which transforms the subjective assessment of constructability knowledge to a quantified value so that it is easy to analyze and improve building design. The proposed methodology uses the advancement of object oriented Building Information Model (BIM) and 4D simulation model to serve as a data repository models for the constructability assessment platform. Factors affecting constructability of building designs have been identified and relatively weighted using Analytical Hierarchy Process (AHP) technique based on a questionnaire survey collected throughout the Canadian provinces. Evaluation criteria are also developed to assist the designer to evaluate the design proposals. The outcome shows that the proposed method provides the designer an accurate and faster mode in evaluating project constructability by using the parametric features from BIM and taking the advantage of spatial relationship between building components.

关键词： Constructability BIM Simulation Quantitative Assessment

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使用比例数据模型自动检测排污管道闭路电视检查中的异常

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非开挖技术 2017年第2期 129-133页

作者： Saeed Moradi tarek zayed Alaa H. Hawari 钟海晨

排污管的管道状况信息通常使用闭路电视检查（CCTV）收集。此外，为了评估管道的状况，数据应当由已认证的操作者处理，造成时间和成本的浪费，并且还会因为操作者的熟练或疲劳程度而易于出错。自动检测异常可以减少检查的时间和成本，... 详细信息

排污管的管道状况信息通常使用闭路电视检查（CCTV）收集。此外，为了评估管道的状况，数据应当由已认证的操作者处理，造成时间和成本的浪费，并且还会因为操作者的熟练或疲劳程度而易于出错。自动检测异常可以减少检查的时间和成本，同时确保评估的准确性和质量。然而，考虑到排污管道中各种类型以及多种模式的缺陷，使用计算机视觉技术来检测似乎是困难的。本文提出了一种有效的异常检测算法，以支持从CCTV检查视频中获得的数据来自动检测排污管道缺陷。在该模型中，理论地采用了用于比例数据建模的隐马尔可夫模型（HMM），评估了以排污管道闭路电视视频为示例的异常检测中的性能。这种算法包括被认为是正常的建模条件和该模型的监测异常值。

关键词：管道检测排污管道 CCTV 异常

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Nano-Chitosan Loaded N Application for Improving Wheat Plants Yield: Impacts on Soil Nutrient Availability

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Journal of Agricultural Chemistry and Environment 2024年第4期13卷 384-395页

作者： tarek Salah Ahmed Salem Elsayed Mohamed Elskhariy Abdelmonem Mahmoud zayed Ahmed Ibrahim Mohamed Noha Adel Mahgoub Egyptian Ministry of Agriculture Cairo Egypt

This work was held to study the effect of chitosan nanoparticles and loaded N on the wheat plants. A field study was conducted during the winter season 2021/2022 cultivated with wheat (Triticum aestivum L.) on sandy soil at the experimental unit of the Faculty of Agriculture farm-Suez Canal University-Ismailia-Egypt. Results may indicate that the application of foliar chitosan NPs.-loaded nitrogen in different concentrations has been employed to enhance plant growth and productivity, Nano-chitosan loaded with N (500 mg/L) yielded the most grains and was more effective than the control and nano-chitosan loaded N (250 mg/L, 750 mg/L).

关键词： Nano Fertilizer NPK Chitosan Wheat Sandy Soil

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Investigative Review of Design Techniques of Parabolic Trough Solar Collectors

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Frontiers in Heat and Mass Transfer 2024年第1期22卷 317-339页

作者： Roba tarek AbdelFatah Irene S.Fahim Mohamed Mahran Kasem Smart Engineering Systems Research Center(SESC) Nile UniversityShaikh Zayed City12588Egypt

Parabolic trough solar collectors(PTCs)are among the most cost-efficient solar thermal *** have several applications,such as feed heaters,boilers,steam generators,and electricity generators.A PTC is a concentrated solar power system that uses parabolic reflectors to focus sunlight onto a tube filled with heattransfer *** performance can be investigated using optical and thermal mathematical *** models calculate the amount of energy entering the receiver,the amount of usable collected energy,and the amount of heat loss due to convection and *** are several methods and configurations that have been developed so far;however,it is usually difficult for a designer to choose the appropriate method or configuration for his *** present work investigates different PTC configurations and methods of solution,compares their efficiency and accuracy,summarizes their key behaviors and trends,and improves the available methods by maximizing the positives and minimizing the negatives among *** investigated three methods and seven *** findings suggest that optimizing the collector structure,tracking system,and reflector can lead to high PTC performance and reduced capital *** investigating and comparing the recent mathematical models,the study identified a clear deficiency in estimating the output *** PTC’s solution methods are investigated,and a novel method is developed to give more accurate estimations of the output temperature.

关键词： Parabolic trough collectors solar collector PTC mathematical models

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