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Aging behavior of a copper-bearing high-strength low-carbon steel

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International Journal of Minerals,Metallurgy and Materials 2018年第4期25卷 429-438页

作者： Babak Shahriari Reza Vafaei ehsan Mohammad sharifi Khosro Farmanesh Department of Materials Engineering Malek Ashtar University of Technology

The effects of aging temperature and time on the hardness and impact toughness of a copper-bearing high-strength low-carbon steel were investigated. The hardness of the aged samples reached maxima after 1 h and 5 h of aging at 500 and 450℃, respectively; this increase in hardness was followed by a decrease in hardness until a temperature of 700℃, at which secondary hardening was observed. The impact toughness of the aged steel was found to be higher for 5 h of aging. Transmission electron microscopy confirmed the presence of carbide and copper precipitates; also, the secondary hardening could be the result of the transformation of austenite（formed in the aging treatment） to martensite. Differential scanning calorimetry of the steel was performed to better understand the precipitation behavior. The results revealed that the precipitation of the steel exhibited two significant stages of copper precipitate nucleation and coarsening of the precipitates, with corresponding activation energies of 49 and 238 kJ·mol^-1, respectively.

关键词： aging treatment BA-160 steel differential scanning calorimetry precipitation

What leads to variations in the results of life-cycle energy assessment?An evidence-based framework for residential buildings

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能源与人工环境(英文) 2021年第4期2卷 392-405页

作者： Hossein Omrany Veronica Soebarto Jian Zuo ehsan sharifi Ruidong Chang School of Architecture&Built Environment-University of Adelaide AdelaideAustralia

Residential buildings are one of the major contributors to climate change due to their significant impacts on global energy ***,most countries have introduced regulations to minimize energy use in residential *** date,the focus of these regulations has mainly been on operational energy while excluding embodied *** recent years,extensive studies have highlighted the necessity of minimizing both embodied energy and operational energy by applying the life-cycle energy assessment(LCEA)***,the absence of a standardized framework and calculation methodology for the analysis of embodied energy has reportedly led to variations in the LCEA *** research endeavoured to explore the causes of variations,with a limited focus on calculating embodied *** the undertaken attempts,there is still a need to investigate the key parameters causing variations in LCEA results by examining methodological approaches of the current studies toward quantifications of embodied and operational *** paper aims to address three primary questions:‘what is the current trend of methodological approach for applying LCEA in residential buildings?’;‘what are the key parameters causing variations in LCEA results?’;and‘how can the continued variations in the application of LCEA in residential buildings be overcome?’.To this end,40 LCEA studies representing 157 cases of residential buildings across 16 countries have been critically *** findings reveal four principal categories of parameters that potentially contribute to the varying results of LCEAs:system boundary definition,calculation methods,geographical context,and interpretation of *** paper also proposes a conceptual framework to minimize variations in LCEA studies by standardizing the process of conducting LCEAs.

关键词： Life cycle energy assessment Life cycle assessment Residential buildings Energy efficiency Embodied energy Operational energy

Secrecy Outage Probability Minimization in Wireless-Powered Communications Using an Improved Biogeography-Based Optimization-Inspired Recurrent Neural Network

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Computers, Materials & Continua 2024年第3期78卷 3971-3991页

作者： Mohammad Mehdi sharifi Nevisi Elnaz Bashir Diego Martín Seyedkian Rezvanjou Farzaneh Shoushtari ehsan Ghafourian Department of Industrial Engineering Iran University of Science and TechnologyNarmakTehran16846-13114Iran Department of Computer Science Iowa State UniversityAmesIowaIA50011USA ETSI de Telecomunicación Universidad Politécnica de MadridMadrid28040Spain Department of Engineering California State University East BayHaywardCalifornia94542USA Department of Industrial Engineering Bu-Ali Sina UniversityHamedan65178-38695Iran

This paper focuses on wireless-powered communication systems,which are increasingly relevant in the Internet of Things(IoT)due to their ability to extend the operational lifetime of devices with limited *** main contribution of the paper is a novel approach to minimize the secrecy outage probability(SOP)in these *** SOP is crucial for maintaining the confidentiality and integrity of data,especially in situations where the transmission of sensitive data is *** proposed method harnesses the power of an improved biogeography-based optimization(IBBO)to effectively train a recurrent neural network(RNN).The proposed IBBO introduces an innovative migration *** core advantage of IBBO lies in its adeptness at maintaining equilibrium between exploration and *** is accomplished by integrating tactics such as advancing towards a random habitat,adopting the crossover operator from genetic algorithms(GA),and utilizing the global best(Gbest)operator from particle swarm optimization(PSO)into the IBBO *** IBBO demonstrates its efficacy by enabling the RNN to optimize the system parameters,resulting in significant outage probability *** comprehensive simulations,we showcase the superiority of the IBBO-RNN over existing approaches,highlighting its capability to achieve remarkable gains in SOP *** paper compares nine methods for predicting outage probability in wireless-powered *** IBBO-RNN achieved the highest accuracy rate of 98.92%,showing a significant performance *** contrast,the standard RNN recorded lower accuracy rates of 91.27%.The IBBO-RNN maintains lower SOP values across the entire signal-to-noise ratio(SNR)spectrum tested,suggesting that the method is highly effective at optimizing system parameters for improved secrecy even at lower SNRs.

关键词： Wireless-powered communications secrecy outage probability improved biogeography-based optimization recurrent neural network

Co Complexes as a Corrosion Inhibitor for 316 L Stainless Steel in H₂SO₄ Solution

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Journal of Materials Science and Chemical Engineering 2016年第9期4卷 28-35页

作者： Amin Rabiei Baboukani ehsan sharifi Saeid Akhavan Ahmad Saatchi Department of Materials Science and Engineering Najafabad Branch Islamic Azad University Najafabad Iran Department of Materials Engineering Daneshpajoohan Institute of Higher Education Isfahan Iran Department of Materials Engineering Isfahan University of Technology Isfahan Iran Department of Materials Science and Engineering University of Wisconsin-Madison Madison USA

The effect of Co complexes with a Schiff base ligand on the electrochemical corrosion behavior of 316 L SS in 0.1 M H2SO4 at 25℃ has been investigated at various inhibitor concentration using electrochemical techniques (impedance spectroscopy (EIS), polarization curves). Corrosion measurements indicate that Co complex act as moderately inhibitors. Results revealed that increasing the concentration of Co complex increases the corresponding IE% values till 100 ppm. Co complex acts as mixed type inhibitors with predominant effect on the anodic dissolution of iron. Adsorption studies showed that the process follows Langmuir adsorption isotherm.

关键词： Corrosion Inhibitors Co Complex 316 L Stainless Steel Polarization EIS

Tribological behavior of ZK60Gd alloy reinforced by SiC particles after precipitation hardening

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Journal of Magnesium and Alloys 2023年第9期11卷 3362-3381页

作者： ehsan Momeni Hassan sharifi Morteza Tayebi Ahmad Keyvani Ermia Aghaie Yashar Behnamian Department of Materials Science and Engineering University of ShahrekordIran Young Researchers and Elites Club Science and Research BranchIslamic Azad UniversityTehranIran Department of Chemical and Materials Engineering University of AlbertaEdmontonAlberta T6G 1H9Canada

In this research, the effect of precipitation hardening on the tribological behavior of the ZK60Gd/SiC composite was studied. For this purpose, ZK60Gd alloy containing with 5 and 10 wt% SiC were produced with stir casting method. The microstructure characterization of the samples showed the wide distributions of Mg_(7)Zn_(3) and Gd(Mg_(0.5)Zn_(0.5)) precipitates were formed during casting. The results of hardness measurement after precipitation hardening at different temperatures showed that the hardness peck was obtained at 175 ℃. The wear tests with different loads(10, 40, 60, 90, and 120 N) and velocities(0.1, 0.3, 0.6, and 0.9 m/s) were performed on the as-cast and heat treated sample at 125, 175, and 225 for 12 h. Between the different precipitation hardening conditions, the precipitation hardened samples at 175 ℃ had the highest hardness values and least wear rate. The sample containing 10% reinforcement had the least wear rate between the unreinforced alloy and the composites. The results showed that abrasive, adhesive, delamination, MML, and fatigue wear mechanisms were the dominant wear mechanisms for the composite samples. In contrast, the dominant wear mechanism for the unreinforced samples was abrasive, adhesive,delamination, MML, and plastic deformation.

关键词： Precipitation hardening Composite Gadolinium Mg-Zn-Zr-Gd Wear map

A reappraisal of active faults in central-east Iran(Kerman province)

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Earthquake Science 2022年第2期35卷 122-137页

作者： Mohammad Talebi Abbas Sivandi-Pour Ghasem-Ali Ahmadi ehsan Noroozinejad Farsangi Shamseddin Esmaeili Mohammad-Javad Banimahdi-Dehkordi Hamidreza Safizadeh Mahdieh Akbarpoor ehsan Ebrahimi Rabe sharifi Rad Manoochehr Fallah International Institute of Earthquake Engineering and Seismology(IIEES) Tehran ***Iran Faculty of Civil and Surveying Engineering Graduate University of Advanced TechnologyKerman ***Iran Geological and Geotechnical Department Padidab Sepahan Consulting EngineersEsfahan ***Iran Razi University Kermanshah ***Iran Institute for Advanced Studies in Basic Sciences(IASBS) Zanjan ***Iran Kerman Provincial Gas Corporation National Iranian Gas CompanyKerman ***Iran

Fault lineaments are the main input data in earthquake engineering and seismology *** study presents a digitally-based active fault map of the Kerman region in central-east Iran which experienced several devastating earthquakes on poorly exposed and/or not identified active *** Landsat 8 data,we have carried out the image-based procedures of fault mapping,which include applying the contrast stretching technique,the principal component analysis,the color composite technique,the spectral rationing,and creating the false-color composite ***,we have cross-checked the resulting map with the geological maps provided by the Geological Survey of Iran to decrease the associated *** resulting map includes 123 fault segments,still,a part of which has been expressed in the previously compiled active-fault maps of ***,the new one is mapping the poorly exposed active faults,so-called secondary faults,which are able to produce strong *** faults are primarily associated with poorly defined areas that accommodate low levels of seismicity;however,sporadic strong events are likely to *** has also been investigated that these kinds of faults are seismogenic and are able to produce destructive *** total,the outcome of this study can also be jointed with seismic studies for investigating parts of the earthquake activity in central-east Iran,in particular for the fault-based approaches in impending earthquake-resistant buildings.

关键词： central-east Iran Kerman active fault satellite image processing remote sensing

Lawsone-encapsulated chitosan/polyethylene oxide nanofibrous mat as a potential antibacterial biobased wound dressing

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Engineered Regeneration 2021年第1期2卷 219-226页

作者： Fatemeh Saniee Abadehie Ali Hasanpour Dehkordi Mahdi Zafari Mitra Bagheri Satar Yousefiasl Samiramis Pourmotabed Leila Mahmoodnia Majid Validi Milad Ashrafizadeh ehsan Nazarzadeh Zare Navid Rabiee Pooyan Makvandi Esmaeel sharifi Cellular and Molecular Research Center Basic Health Science InstituteShahrekord University of Medical SciencesShahrekordIran Social Determinants of Health Research Center Department of Medical-SurgicalFaculty of Nursing and MidwiferyShahrekord University of Medical SciencesShahrekordIran National Cell Bank Pasteur Institute of IranTehranIran School of Dentistry Hamadan University of Medical Sciences*** HamadanIran Department of Emergency Medicine School of MedicineHamadan University of Medical Sciences***HamadanIran Department of Internal Medicine Shahrekord University of Medical SciencesShahrekordIran Department of Medical Laboratory Sciences School of Allied Medical SciencesShahrekord University of Medical SciencesShahrekordIran Faculty of Engineering and Natural Sciences Sabanci UniversityOrta MahalleUniversite Caddesi No.27OrhanliTuzlaIstanbul 34956Turkey Sabanci University Nanotechnology Research and Application Center(SUNUM) TuzlaIstanbul 34956Turkey School of Chemistry Damghan UniversityDamghan 36716-41167Iran Department of Physics Sharif University of TechnologyP.O.Box 11155-9161TehranIran School of Engineering Macquarie UniversitySydneyNew South Wales2109Australia Istituto Italiano di Tecnologia Centre for Materials Interfacesviale Rinaldo Piaggio 3456025 PontederaPisaItaly Department of Tissue Engineering and Biomaterials School of Advanced Medical Sciences and TechnologiesHamadan University of Medical SciencesHamadanIran

Biodegradable and absorptive wound dresses with antibacterial activity are in demand to accelerate wound heal-ing along with eliminating bacterial ***-derived naphthoquinones compounds such as lawsone have shown sustained antibacterial functions to avoid development of bacterial resistance by reducing pH or attaching to bacterial *** the nanofibrous mats based on chitosan/polyethylene oxide(PEO)fibers containing various concentrations of lawsone(0,1,3,7,10%wt.)were fabricated by electrospinning for potential applications as wound dressing *** results exhibited that the chitosan/PEO/Lawsone nanofibers possess antibacterial activity toward Gram-negative and-positive ***,the addition of lawsone in the proper amount into chitosan/PEO nanofibers not only introduced an antithetical property but also reduced the platform’s cytotoxicity,promoting cell viability of normal human fibroblast ***,the achieved data suggest the potential application of biocompatible nanofibrous mats as an antibacterial wound dressing material.

关键词： Chitosan Lawsone Antibacterial wound dressing Nanofibrous mat