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Recent progress and perspectives in additive manufacturing of magnesium alloys

Journal of Magnesium and Alloys 2022年第6期10卷 1511-1541页

作者： Zhuoran Zeng mojtaba salehi Alexander Kopp Shiwei Xu Marco Esmaily Nick Birbilis College of Engineering and Computer Science Australian National UniversityACT.2601 Australia Additive Manufacturing Group Singapore Institute of Manufacturing Technology(SIMTech)Agency forScienceTechnology and Research(A∗STAR)73 Nanyang Drive637662 Singapore Meotec GmbH Philipsstr.8AachenGermany State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsh1410082 China Department of Materials Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139United States of America Volvo Materials Technology Laboratory Volvo GroupLundbyGothenburg 41715Sweden

Magnesium alloys remain critical in the context of light-weighting and advanced devices. The increased utilisation of magnesium(Mg)each year reveals growing demand for its Mg-based alloys. Additive manufacturing(AM) provides the possibility to directly manufacture components in net-shape, providing new possibilities and applications for the use of Mg-alloys, and new prospects in the utilisation of novel physical structures made possible from ‘3D printing’. The review herein seeks to holistically explore the additive manufacturing of Mg-alloys to date, including a synopsis of processes used and properties measured(with a comparison to conventionally prepared Mg-alloys). The challenges and possibilities of AM Mg-alloys are critically elaborated for the field of mechanical metallurgy.

关键词： Magnesium Additive manufacturing Microstructure 3D printing Mechanical properties Electrochemical properties

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Analysis of the corrosion performance of binder jet additive manufactured magnesium alloys for biomedical applications

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Journal of Magnesium and Alloys 2022年第5期10卷 1296-1310页

作者： Kai Xiang Kuah Daniel J.Blackwood Wee Kit Ong mojtaba salehi Hang Li Seet Mui Ling Sharon Nai Sudesh Wijesinghe Department of Materials Science&Engineering National University of Singapore9 Engineering Drive 1117575 Singapore Reliability and Characterisation Unit Singapore Institute of Manufacturing Technology(SIMTech)Agency forScienceTechnology and Research(A^(∗)STAR)73 Nanyang Drive637662 Singapore Additive Manufacturing Group Singapore Institute of Manufacturing Technology(SIMTech)Agency forScienceTechnology and Research(A^(∗)STAR)73 Nanyang Drive637662 Singapore

Binder jet printing(BJP)is a state-of-the-art additive manufacturing technique for producing porous magnesium structures.Porous MgZn-Zr based BJP samples were assessed for corrosion performance in simulated body fluids by electrochemical and hydrogen evolution measurements.The corrosion rates of the BJP specimens were significantly higher than solid controls,even after accounting for their larger surface areas,suggesting that the BJP microstructure is detrimental to corrosion performance.X-ray computed tomography revealed nonuniform corrosion within the porous structure,with corrosion products forming on the pore walls.Impregnating the pores with hydroxyapatite or polymers greatly improved the corrosion resistance of the BJP samples.

关键词： Magnesium Additive manufacturing Binder jetting Porous Corrosion Biodegradability

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Multi-objective energy management of island microgrids with D-FACTS devices considering clean energy, storage systems and electric vehicles

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Clean Energy 2023年第5期7卷 1046-1057页

作者： Mahyar Moradi Mohamad Hoseini Abardeh mojtaba Vahedi Nasrin salehi Azita Azarfar Department of Electrical Engineering Shahrood BranchIslamic Azad UniversityShahroodIran Department of Basic Sciences Shahrood BranchIslamic Azad UniversityShahroodIran

The development of microgrids is progressing due to intelligent load demands,clean energy,batteries and electric vehicles.The presence of such systems in microgrids causes power balance inconsistency,leading to increased power losses and deviation in voltage.In this pa-per,a mixed-integer non-linear programming model is proposed for modelling island microgrid energy management considering smart loads,clean energy resources,electric vehicles and batteries.Similarly,a flexible distributed AC transmission system device is proposed to prevent voltage deviation and reduce power losses.A scenario-based multi-objective function has been proposed to decrease energy losses and voltage deviations and energy outages of clean energy resources,reduce emissions from fossil-fired distributed generation and finally decrease load outages to reduce the vulnerability of the islanded microgrid.Regarding the proposed mixed-integer non-linear model and the high number of variables and constraints,a modified evolutionary algorithm based on particle swarm optimization has been proposed to solve the proposed model,which can be more efficient than other algorithms to achieve global optimal solutions.The model presented is implemented on a 33-node island microgrid and the results illustrate that the proposed algorithm and model are effective in reducing energy losses and voltage deviation,as well as reducing the vulnerability of the microgrid.The simulation results demonstrate that the proposed approach can lead to significant improvements in the performance of the microgrid.Specifically,the ap-proach can result in a 27%reduction in losses,a 6%reduction in pollution and a 31%improvement in voltage.Additionally,the approach allows maximum utilization of renewable energy sources,making it a promising solution for sustainable energy management.

关键词： microgrid D-FACTS clean energy battery electric vehicles evolutionary algorithm

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Co-optimization of integrated energy systems in the presence of renewable energy,electric vehicles,power-to-gas systems and energy storage systems with demand-side management

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Clean Energy 2023年第2期7卷 426-435页

作者： Mahroo Sattar Mahmoud Samiei Moghaddam Azita Azarfar Nasrin salehi mojtaba Vahedi Department of Electrical Engineering Shahrood BranchIslamic Azad UniversityShahroodIran Department of Electrical Engineering Damghan BranchIslamic Azad UniversityDamghanIran Department of Basic Sciences Shahrood BranchIslamic Azad UniversityShahroodIran

With the widespread penetration of renewable energy sources and energy storage systems,the problem of energy management has received increasing attention.One of the systems that network owners consider today is the power-to-gas(P2G)system.This system causes surplus electricity generated from renewable energy resources or batteries in the network to be converted into gas and sold to the gas network.Two reasons for the existence of gas distributed generation resources and P2G systems cause the two power and gas networks to interact.Energy management and profit making considering these two networks,as a co-optimization of integrated energy systems,is a topic that has been discussed in this study to achieve the best optimal answer.Since the production of renewable energy resources and the purchase price of energy are uncertain,a scenario-based method has been chosen for modelling.Demand-side management is also one of the important problems in optimal operation of the electricity network,which can have a significant impact on reducing peak load and increasing profits.In this paper,a mixed-integer quadratic programming model for co-optimization of electric distribution and gas networks in the presence of distributed generation resources,P2G systems,storage facilities,electric vehicles and demand-side management is presented.The 33-bus distribution network is intended to analyse the proposed model.The results of different scenarios show the efficiency of the proposed model.Several key points are deduced from the obtained results:(i)demand-side management is able to reduce the peak load of the network,(ii)the presence of renewable resources and batteries can cause the network to convert excess electricity into gas and sell it to the gas network in the market and(iii)distributed generation can reduce the purchase of energy from the upstream network and cause a 36% reduction in the cost function.

关键词： optimization linear programming integrated systems power-to-gas scenario-based model electricity distribution

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Ultra-thin broadband solar absorber based on stadium-shaped silicon nanowire arrays

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Frontiers of Optoelectronics 2022年第1期15卷 60-72页

作者： Seyedeh Leila Mortazavifar Mohammad Reza salehi mojtaba Shahraki Ebrahim Abiri Department of Electrical and Electronics Engineering Shiraz University of TechnologyModarres Blvd71557-13876 ShirazIran Faculty of Electrical and Electronics Engineering University of Sistan and BaluchestanDaneshgah Blvd98613-35856 ZahedanIran

This paper investigates how the dimensions and arrangements of stadium silicon nanowires(NWs)affect their absorption properties.Compared to other NWs,the structure proposed here has a simple geometry,while its absorption rate is compa-rable to that of very complex structures.It is shown that changing the cross-section of NW from circular(or rectangular)to a stadium shape leads to change in the position and the number of absorption modes of the NW.In a special case,these modes result in the maximum absorption inside NWs.Another method used in this paper to attain broadband absorption is utiliza-tion of multiple NWs which have different geometries.However,the maximum enhancement is achieved using non-close packed NW.These structures can support more cavity modes,while NW scattering leads to broadening of the absorption spectra.All the structures are optimized using particle swarm optimizations.Using these optimized structures,it is viable to enhance the absorption by solar cells without introducing more absorbent materials.

关键词： Ultra-thin solar cells(SCs) Light trapping Stadium silicon nanowire(NW) Optical resonators Diffraction

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Effect of sex and rearing system on the quality and mineral content of fiber from raeini cashmere goats

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Journal of Animal Science and Biotechnology 2012年第3期3卷 160-165页

作者： Mehrdad Shamsaddini-Bafti Mahnaz salehi Ali Maghsoudi Ali Mostafa Tehrani Farhad Mirzaei Syed mojtaba Syed Momen Razi Vaccine&Serum Research Institute Kerman Branch 76175KermanIran Animal Science Research Institute of Iran Dehghan Villa 31585KarajIran Department of Agriculture Faculty of Animal ScienceTarbiat Modares University TehranIran 不详

The aim of this study was to compare the quality characteristics and mineral content of the fiber from male and female cashmere goats raised under different management systems. Male and female Raeini cashmere goats （〈1.5 years of age, n=48） were selected from flocks raised at a government breeding station or raised commercially under either rural or nomadic conditions. The staple length, cashmere fiber diameter, coefficient of variation for fiber diameter, percentage of cashmere in a fleece, percentage of guard hair in a fleece and cashmere tenacity averaged 4.6 ±0.1 cm, 18.0 ±0.1 um, 20.9±0.4%, 66.1 ± 1.5%, 33.8± 1.5% and 1.8±0.2 gf/tex, respectively. The sulfur, copper and zinc content of the cashmere averaged 2.8 ± 0.1%, 0.00065 ± 0.00002% and 0.01276 ± 0.00025%, respectively. Rearing method significantly affected staple length, coefficient of variation of fiber diameter, cashmere tenacity and copper content. Males had a higher coefficient of variation of fiber diameter and cashmere tenacity than females （P 〈 0.05）.

关键词： cashmere fiber mineral contents Raeini goat

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Magnetite / Polyvinylpyrrolidone Nanocomposite: Green Simple Fabrication and characterization

Magnetite / Polyvinylpyrrolidone Nanocomposite: Green Simple...

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International Conference on Chemistry and Chemical Engineering （ICCCE 2011）

作者： Mohammad Taghi salehi mojtaba Nasr-Esfahani Ali Sharifian-Esfahani Ehsan Ekramian Department of Material Science and Engineering Najafabad Branch Islamic Azad University Najafabad 85141-43131 Iran

The paper presents results of research on green simple preparing the magnetic nanocomposite based on Fe3O4 nanoparticles. The synthesis and assembly of magnetite nanoparticles was performed by a one-step procedure. Fe3O4 nanoparticles can be synthesized by Y. Zheng method. Polyvinylpyrrolidone （PVP） homopolymer with molecular weight about 10,000;synthesized by hydrogen peroxide/ascorbic acid as a redox couple initiator in aqueous medium. A kind of nanocomposite with nano Fe3O4 as the core and an absorption layer of PVP molecules surrounding it have been prepared. The PVP modification did not change the crystalline structure of Fe3O4, and the PVP-coated Fe3O4 nanoparticles. The average size of the individual magnetite particles is about 8 nm, calculated by the Scherrer equation The ability to synthesize and assemble monodispersed core-shell nanoparticles is important for exploring the unique properties of nanoscales core- shell, or their combinations in magnetic, catalytic, and biological applications.

关键词： Magnetic nanoparticles Fe3O4 / PVP nanocomposite Particle size Particle density.

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