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In this research parallel molecular dynamics (MD) simulations have been performed to study the deformation behavior of nanocrystalline copper samples with embedded nanotwins under approximately uniaxial tensile load. Simulation results reveal that twin boundaries (TBs) act as obstacles to dislocation movements that lead to the strengthening of nanotwinned structures. However, easy glide of dislocations parallel to the TBs contribute primarily to the plastic strain or ductility of these materials. At higher deformation stages, the strengthening effects reach a maximum when abundant dislocations begin crossing the TBs. Due to this highly anisotropic plastic response of the grains, a random polycrystalline sample will show combined properties of ductility and strength. The strengths of the nanotwinned models are found to exhibit an inverse relationship with the twin width and temperature. We also investigate the relation between the deformation behavior in different grains, their orientation with respect to the loading direction, and ultimately the observed response of nanotwinned structures. 相似文献
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Abdallah Mohamed Arab Mohamed Shabib Ahmad El-Sherbiny Rami El-Sheltawy Shakinaz 《Clean Technologies and Environmental Policy》2020,22(6):1371-1383
Clean Technologies and Environmental Policy - The aim of the present study was to establish a national database of waste characteristics for Egypt to support the assessment of various waste... 相似文献
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Mohammad Sh. Daoud Areej Fatima Waseem Ahmad Khan Muhammad Adnan Khan Sagheer Abbas Baha Ihnaini Munir Ahmad Muhammad Sheraz Javeid Shabib Aftab 《计算机、材料和连续体(英文)》2022,70(1):109-124
The numbers of multimedia applications and their users increase with each passing day. Different multi-carrier systems have been developed along with varying techniques of space-time coding to address the demand of the future generation of network systems. In this article, a fuzzy logic empowered adaptive backpropagation neural network (FLeABPNN) algorithm is proposed for joint channel and multi-user detection (CMD). FLeABPNN has two stages. The first stage estimates the channel parameters, and the second performs multi-user detection. The proposed approach capitalizes on a neuro-fuzzy hybrid system that combines the competencies of both fuzzy logic and neural networks. This study analyzes the results of using FLeABPNN based on a multiple-input and multiple-output (MIMO) receiver with conventional partial opposite mutant particle swarm optimization (POMPSO), total-OMPSO (TOMPSO), fuzzy logic empowered POMPSO (FL-POMPSO), and FL-TOMPSO-based MIMO receivers. The FLeABPNN-based receiver renders better results than other techniques in terms of minimum mean square error, minimum mean channel error, and bit error rate. 相似文献
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A. M. Saravanan Asma Said Al-Kharusi Anna Jesil Shabib Rashdi 《Applied Solar Energy》2017,53(3):238-242
The paper investigates the experimental studies on conversion of seawater into drinking using solar energy with the help of single basin double slope solar still unit. 相似文献
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Elastic Properties of UHMWPE-SWCNT Nanocomposites’ Fiber: An Experimental, Theoretic, and Molecular Dynamics Evaluation 总被引:1,自引:0,他引:1
Mujibur R. Khan Hassan Mahfuz Ashfaq Adnan Ishraq Shabib Theodora Leventouri 《Journal of Materials Engineering and Performance》2013,22(6):1593-1600
Ultrahigh molecular weight polyethylene (PE) filaments were reinforced with 2 wt.% of single-walled carbon nanotubes (SWCNTs). The solution spinning method was used to produce both neat and reinforced PE filaments. Tensile tests and strain hardening through repeated loading-unloading cycles of the filaments revealed a spectacular contribution of the SWCNTs in enhancing the elastic properties, e.g., strength and modulus. The theoretic strength and modulus of the reinforced PE were predicted using the shear lag model and micromechanics-based model, respectively, and verifying with experimental results. It was observed that the predicted strength and modulus were comparable only with those obtained after strain hardening. In the next step, a molecular dynamic simulation was conducted by simulating a unit cell containing a SWCNT surrounded by PE matrix subjected to uniaxial tensile strain. The strength and modulus of the simulated structure showed an agreement, to certain extent, with experimental observations of strain-hardened nanocomposites. 相似文献
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Ahmad Shabib 《The International journal of environmental studies》2020,77(5):786-806
ABSTRACT The interest in waste power plants (WPPs) has significantly increased over recent years owing to massive waste quantities, negative environmental impacts of landfilling, and depletion of conventional energy resources. This paper provides a well-established framework for the technical, environmental and economic life-cycle assessment of WPP projects through the review of relevant reports and studies in the literature. This review covers the standard methods for environmental life-cycle assessment and life-cycle costing of WPP systems. It was found that the environmental and financial lifecycle viability of WPP projects significantly varies with the region and local characteristics. 相似文献
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