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A comparative study between friction stir processing and friction stir vibration processing to develop magnesium surface nanocomposites

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International Journal of Minerals,Metallurgy and Materials 2020年第8期27卷 1133-1146页

作者： Behrouz Bagheri Mahmoud Abbasi Amin Abdollahzadeh amir hossein Kokabi Department of Mining and Metallurgy Amirkabir University of TechnologyTehranIran Faculty of Engineering University of KashanRavandi Blvd.KashanIran Department of Materials Science and Engineering Sharif University of TechnologyTehranIran Institute of Materials Engineering and Advanced Processes Department of Mining and MetallurgyAmirkabir University of TechnologyTehranIran

Friction stir processing(FSP)can be used to improve surface *** this study,a modified method of FSP called friction stir vibration processing(FSVP)was applied to develop a surface composite on AZ91 magnesium *** this technique,the workpiece is vibrated normal to the processing *** results illustrated that compared with the FSP method,the FSVP caused a better homogeneous distribution of SiC particles in the *** results also showed that matrix grains of friction stir vibration processed(FSV-processed)samples((26.43±2.00)μm)were finer than those of friction stir processed(FS-processed)specimens((39.43±2.00)μm).The results indicated that the ultimate tensile strength(UTS)of FSV-processed specimens(361.82 MPa)was higher than that of FS-processed specimens(324.97 MPa).The higher plastic strain in the material during FSVP,due to workpiece vibration,resulted in higher dynamic recrystallization,and consequently,finer grains were *** elongation and formability index of the FSV-processed specimen(16.88%and 6107.52 MPa·%,respectively)were higher than those of the FS-processed sample(15.24%and 4952.54 MPa·%,respectively).Moreover,the effects of FSVP were also found to intensify as the vibration frequency increased.

关键词： friction stir processing friction stir vibration processing surface composite mechanical properties microstructure

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A hybrid LQR-PID control design for seismic control of buildings equipped with ATMD

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Frontiers of Structural and Civil Engineering 2018年第1期12卷 44-57页

作者： amir hossein HEIDARI Sadegh ETEDALI Mohamad Reza JAVAHERI-TAFTI Department of Civil Engineering Taft Branch Islamic Azad University Taft Iran Department of Civil Engineering Birjand University of Technology P.O. Box 97175-569 Birjand Iran

This paper presents an efficient hybrid control approach through combining the idea of proportional- integral-derivative （PID） controller and linear quadratic regulator （LQR） control algorithm. The proposed LQR-PID controller, while having the advantage of the classical PID controller, is easy to implement in seismic-excited structures. Using an optimization procedure based on a cuckoo search （CS） algorithm, the LQR-PID controller is designed for a seismic- excited structure equipped with an active tuned mass damper （ATMD）. Considering four earthquakes, the performance of the proposed LQR-PID controller is evaluated. Then, the results are compared with those given by a LQR controller. The simulation results indicate that the LQR-PID performs better than the LQR controller in reduction of seismic responses of the structure in the terms of displacement and acceleration of stories of the structure.

关键词： eismic control tuned mass dampers cuckoo search PID controller LQR controller

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Application of ion-engineered Persian Gulf seawater in EOR:effects of different ions on interfacial tension,contact angle,zeta potential,and oil recovery

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Petroleum Science 2021年第3期18卷 895-908页

作者： amir hossein Saeedi Dehaghani Seyed Masoud Ghalamizade Elyaderani Department of Petroleum Engineering Faculty of Chemical EngineeringTarbiat Modares UniversityTehranIran

In this study,we initially performed interfacial tension(IFT)tests to investigate the potential of using the Persian Gulf seawater(PGSW)as smart water with diferent concentrations of NaCl,KCl,MgCl_(2),CaCl_(2),and Na_(2)SO_(4).Next,for each salt,at the concentration where IFT was minimum,we conducted contact angle,zeta potential,and micromodel fooding *** results showed that IFT is minimized if NaCl or KCl is removed from PGSW;thus,for solutions lacking NaCl and KCl,the IFT values were obtained at 26.29 and 26.56 mN/m,***,in the case of divalent ions,minimum IFT occurred when the concentration of MgCl_(2),CaCl_(2),and Na_(2)SO_(4) in PGSW ***,a threefold rise in the concentration of Na_(2)SO_(4) further reduced IFT as compared to optimal concentrations of MgCl_(2) or CaCl_(2).It should be mentioned that eliminating NaCl from PGSW resulted in the lowest IFT value compared to adding or removing other *** the removal of NaCl caused the contact angle to decrease from 91.0°to 67.8°relative to PGSW and changed surface wettability to weakly water-wet,eliminating KCl did not considerably change the contact angle,such that it only led to a nine-degree reduction in this angle relative to PGSW and left wettability in the same neutral-wet *** optimal concentrations of MgCl_(2),CaCl_(2),and Na_(2)SO_(4),only an increase in Na_(2)SO_(4) concentration in PGSW could change wettability from neutral-wet to weakly *** solutions with optimal concentrations,the removal of NaCl or KCl caused the rock surface to have slightly higher negative charges,and increasing the concentration of divalent ions led to a small reduction in the negative charge of the *** results of micromodel fooding indicated that NaCl-free PGSW could raise oil recovery by 10.12%relative to ***,when the Na_(2)SO_(4) concentration in PGSW was tripled,the oil recovery increased by 7.34%compared to ***,depending on th

关键词： Smart water Minimum IFT Wettability Zeta potential Enhanced oil recovery

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Responsiveness of Anopheles maculipennis to different imagicides during resurgent malaria

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Asian Pacific Journal of Tropical Medicine 2010年第5期3卷 360-363页

作者： Vatandoost Hasasan Zahirnia amir hossein Department of Medical Entomology School of Public HealthTehran University of Medical SciencesP.O.Box 6446Tehran 1455Iran

Objective:To determine the susceptibility of main malaria vector in Astra County,borderline of Iran and Republic of Azerbaijan for better ***:Susceptibility of Anopheles mactdipennis to diagnostic doses of DDT 4% ,dieldrin 0.4% ,malathion 5% ,lambdacyhalothrin 0.1% ,and delamethrin 0.025% ,was tested according to method recommended by *** the impregnated papers were provided by ***:It was shown that this species exhibited resistance to DDT,dieldrin,whereas susceptible to malathrion,lambdacyhalothrin and ***:Findings of susceptibility tests of this species provided a clue for control of malaria vector in the region.

关键词： Anopheles maculipennis Insecticides Iran

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Computational analysis of neutronic effects of ThO_2 rods loaded in CANDU 6 fuel assemblies

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Nuclear Science and Techniques 2016年第4期27卷 14-20页

作者： Seyed Mohammad Mirvakili Zohreh Gholamzadeh Seyed amir hossein Feghhi Reactor Research School Nuclear Science and Technology Research Institute Department of Radiation Application Shahid Beheshti UniversityG.C

Thorium as a suitable fertile with higher natural resources in comparison with uranium resources has been remarkably considered by different nuclear energy user countries in the last decades. Its prominent features such as suitable possibility for power flattening of a nuclear reactor, applicable breeder blanket to produce^(233)U fissile as well as neutron leakage prevention from a nuclear core has caused its application as power flatter, breeder material or other aimed utilizations be evaluated by the researches. In the present study, neutronics of a modeled CANDU 6loaded with Th O_2 and UO_2fuel rods have been computationally studied. The study aimed at reprocessing of burned Th O_2 seeds at CANDU 6 reactor to recover the total produced uranium, which is to be going under another compound fuel cycle. The obtained results showed all the core reactivity coefficients are sufficiently negative. The modeled core 949 GWd burn-up concluding in 99.99 %depletion of^(235)U initial loads. 18.38 kg of^(233) U was produced in the burnt Th O_2 fuel after 1-year burn-up time. In addition, 31.84 kg of^(239) Pu was produced in the UO_2 spent fuel rods after the burn-up time. After a proposed cooling time, about 50.01 kg of^(233)U will be available in the spent Th O_2 fuel.

关键词： CANDU堆中子泄漏燃料组件稳定杆计算核反应堆燃烧时间自然资源

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Towards digital architecture,engineering,and construction(AEC)industry through virtual design and construction(VDC)and digital twin

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Energy and Built Environment 2023年第2期4卷 169-178页

作者： Hamed Nabizadeh Rafsanjani amir hossein Nabizadeh School of Engineering and Applied Sciences Western Kentucky UniversityBowling GreenKY 42101United States Kerman University of Medical science KermanIran/INESC-ID/ISTUniversity of LisbonLisbon 1000-029Portugal

The architecture,engineering,and construction(AEC)industry is undergoing a substantial change,and the tech-nological advancements are shaping the future of this *** years,numerous tools have been developed based on building information modeling(BIM)and the Internet of Things(IoT)to manage a variety of tasks and activities within different construction and operational phases in the AEC ***,with the advent of novel internet-enabled technologies in providing the ability of real-time connectivity,researchers have started to develop virtual design and construction(VDC)and digital twin approaches to remotely monitor,control,and optimize different work progresses and activities in real-time at any work level in the AEC *** paper presents a reference model to illustrates the main advantages and applications of VDC and digital twin,and to demonstrate their trends and anticipated cost savings in the AEC industry at a global *** technological advancements along with augmented reality(AR)and virtual reality(VR)can offer the unique benefit of real-time monitoring of the current status as well as predicting the future of any physical structure at any level of *** global demand and usage of these technological advancements will lead to great cost savings in the AEC industry which would be US$950 million in design and construction and US$400 million in operation and maintenance phases in the non-residential AEC industry in *** paper also discusses the future challenges of VDC and digital twin in the *** a main line of future research,these technologies can simultaneously be utilized with artificial intelligence to enable human-centered decision making to automate and optimize work *** integrations of VDC,digital twin,artificial intelligence,and human-centered approaches will shape the future of the AEC industry and provide numerous research opportunities in this domain.

关键词： Virtual design and construction Digital twin BIM IoT Artificial intelligence Augmented reality Virtual reality AEC industry

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Imperialistic Competitive Algorithm:A metaheuristic algorithm for locating the critical slip surface in 2-Dimensional soil slopes

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Geoscience Frontiers 2016年第1期7卷 83-89页

作者： Ali Reza Kashani amir hossein Gandomi Mehdi Mousavi Department of Civil Engineering Arak University Department of Civil Engineering The University of Akron

In this study, Imperialistic Competitive Algorithm（ICA） is utilized for locating the critical failure surface and computing the factor of safety（FOS） in a slope stability analysis based on the limit equilibrium approach. The factor of safety relating to each trial slip surface is calculated using a simplified algorithm of the Morgenstern-Price method, which satisfies both the force and the moment equilibriums. General slip surface is considered non-circular in this study that is constituted by linking random straight *** explore the performance of the proposed algorithm, four benchmark test problems are analyzed. The results demonstrate that the present techniques can provide reliable, accurate and efficient solutions for locating the critical failure surface and relating FOS. Moreover, in contrast with previous studies the present algorithm could reach the lower value of FOS and reached more exact solutions.

关键词： Meta-heuristic algorithms Morgen-stern and price method Non-circular slip surface Imperialistic competitive algorithm

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Experimental investigation of the impact of sugarcane molasses on the properties of colloidal gas aphron(CGA)drilling fluid

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Petroleum 2023年第2期9卷 199-204页

作者： amir hossein Saeedi Dehaghani Seyed Masoud Ghalamizade Elyaderani Department of Petroleum Engineering Faculty of Chemical EngineeringTarbiat Modares UniversityTehranIran

Colloidal gas aphron(CGA)based fluid has become very popular in drilling in the last two decades,as it reduces formation damages *** this study,sugarcane molasses(Mls)was used for the first time as a polymer in CGA-based to investigate its ability to improve the role of aphronized fluid as a drilling *** results showed that increasing the concentration of Mls to 12%(v/v)in CGA-based fluid reduces the drainage rate and increases half-life to 10.6 min,resulting in enhanced stability of the aphronized ***,because of increasing Mls concentration from 1%to 12%(v/v),the yield and the initial gas hold-up decrease to 74%and 299.4 mL,respectively,indicating that the presence of Mls allows less air into the aphron *** the rheological properties were improved in this study,the gel strength did not change ***,the results showed that by increasing the concentration of Mls,the average size of the bubbles decreases,and the particle-size distribution becomes more ***,the API filtration test revealed that the higher the Mls concentration in the aphronized fluid,the lower the fluid loss,and at the Mls concentration of 12%(v/v),the fluid loss was estimated at 19.54 mL.A natural polysaccharide with high molecular weight,Mls can be used as a polymer in CGAbased fluid and,thus,improve its performance.

关键词： Colloidal gas aphron Sugarcane molasses Drainage rate Rheology Filtration loss

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Numerical Solution of the Distributed-Order Fractional Bagley-Torvik Equation

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IEEE/CAA Journal of Automatica Sinica 2019年第3期6卷 760-765页

作者： hossein Aminikhah amir Hosein Refahi Sheikhani Tahereh Houlari Hadi Rezazadeh the Department of Applied Mathematics Faculty of Mathematical Sciences University of Guilan the Department of Applied Mathematics Faculty of Mathematical Sciences Islamic Azad University Lahijan Branch the Faculty of Engineering Technology Amol University of Special Modern Technologies Department of Applied Mathematics University of Guilan

In this paper, two numerical methods are proposed for solving distributed-order fractional Bagley-Torvik *** equation is used in modeling the motion of a rigid plate immersed in a Newtonian fluid with respect to the nonnegative density function. Using the composite Boole's rule the distributedorder Bagley-Torvik equation is approximated by a multi-term time-fractional equation, which is then solved by the GrunwaldLetnikov method(GLM) and the fractional differential transform method(FDTM). Finally, we compared our results with the exact results of some cases and show the excellent agreement between the approximate result and the exact solution.

关键词： Bagley-Torvik equation distributed-order fractional fractional differential transform method Grunwald- Letnikov method

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Innovative configuration of vertical slot fishway to enhance fish swimming conditions

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Journal of Hydrodynamics 2022年第5期34卷 917-933页

作者： Mohammad Ahmadi Alban Kuriqi hossein Mohammad Nezhad amir Ghaderi Mirali Mohammadi Department of Civil Engineering Faculty of EngineeringShabestar BranchIslamic Azad UniversityShabestarIran CERIS Instituto Superior TécnicoUniversidade de LisboaLisbonPortugal Civil Engineering Department University for Business and TechnologyPristinaKosovo Department of Civil Engineering Faculty of EngineeringUrmia UniversityUrmiaIran Department of Civil Engineering Faculty of EngineeringUniversity of ZanjanZanjanIran

A vertical slot fishway(VSF)is among the most effective and commonly used fishway structures to enable fish to pass through artificial barriers such as dams and weirs in the ***,such structures need further improvements in providing better swimming conditions for fish inside the pool and enhancing attraction at the ***,the main objective of this study was to investigate the influence of slope and whether integrating some cylinder structures inside the fishway could enhance further attraction and provide better swimming conditions for *** study consists of several numerical simulations,first considering the fishway without cylinder elements while testing three different slopes under two different ***,the same numerical simulations were conducted,considering cylinder elements of different diameters and arrangements inside the *** numerical model was validated by comparing computed velocities with those measured experimentally from the *** results show that the maximum velocity and turbulent kinetic energy(TKE)in the main jet increase as the discharge increases on the same *** flow velocity and TKE decrease in the areas inside the pool and between the two *** cylinder elements inside the fishway reduces the principal flow’s maximum ***,inside the pool,low-velocity regions were expanding.A comparison between the design with a cylinder and the simple VSF indicates that the presence of a cylinder reduced the maximum velocities for the smallest and highest slopes by 6.21%and 9.86%on average,***,in terms of TKE,cylinders inside the fishway could provide better performance than simple VSF,mainly for low-flow ***,this study’s solution-oriented findings provide insights that could help design cost-effective fishways by improving particularly fish attraction to the fishway.

关键词： Ecohydraulic energy dissipation fish-pass fishway turbulent kinetic energy(TKE)

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