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Acta Metallurgica Sinica(English Letters) 2022年第4期35卷 636-650页

作者： Zohreh Yazdani mohammad Reza Toroghinejad hossein Edris Department of Materials Engineering Isfahan University of Technology84156-83111 IsfahanIran

The strengthening mechanisms of Al-TiAl_(3) nanocomposite, fabricated using cold roll bonding, annealing, and accumulative roll bonding(ARB) on Al sheets sandwiching with pure Ti powder were investigated in the present study. With annealing at 590 ℃ for 2 h, TiAl_(3) intermetallic compound was formed. After subsequent ARB process up to 5 cycles, final composite consists of ultrafine Al grains of less than 500 nm with TiAl_(3) particles larger than 200 nm. The strength and hardness of the final composite are 2.5 and 3.5 times the initial values, with an ultimate tensile strength of 400 MPa, which is dominated by grain-boundary strengthening due to the ultrafine Al grains, and Orowan strengthening due to the small TiAl_(3) particles. For comparison, an alternative fabrication route of cold roll bonding–ARB–annealing was also studied. This study showed that annealing before ARB is a critical factor in producing an ultrafine grain structure containing TiAl_(3) particles.

关键词： Composite Annealing Strength Microstructure Al

Formation mechanism of Al2O3/MoS2 nanocomposite coating by plasma electrolytic oxidation(PEO)

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Plasma Science and Technology 2020年第6期22卷 144-155页

作者： Babak GHORBANIAN mohammad TAJALLY Seyed mohammad MOUSAVI KHOIE hossein TAVAKOLI Faculty of Materials and Metallurgical Engineering Semnan UniversityPO Box 35131-19111SemnanIran Faculty of Mining and Metallurgical Engineering Amirkabir University of TechnologyPO Box 15875-4413 TehranIran

In this study,an Al2O3/MoS2 nanocomposite coating was created on an aluminum 1050 substrate using the plasma electrolytic oxidation *** zeta potential measurements showed that small MoS2 particles have negative potential and move toward the anode *** nanoparticles of MoS2 were found to have a zeta potential of-25 mV,which prevents suspension in the ***,to produce an Al2O3/MoS2 nanocomposite,one has to use the microparticles of *** X-ray diffraction analyses showed that the produced coatings containedα-Al2O3,γ-Al2O3,and MoS2,and that the size of MoS2 particles can be reduced to 30 *** was observed that prolonged suspension in the electrolyte results in an enhanced formation of an Al2O3/MoS2 *** the results,it was hypothesized that the mechanism of the formation of the Al2O3/MoS2 nanocomposite coating on the aluminum 1050 substrate is based on electrical energy discharge.

关键词： plasma electrolytic oxidation corrosion Al2O3/MoS2 nanocomposite tribology

Effect of ultrasonic irradiation on particle size,reagents consumption,and feed ash content in coal flotation

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International Journal of Coal Science & Technology 2020年第4期7卷 787-795页

作者： hossein Ebrahimi mohammad Karamoozian Department of Mining Petroleum and GeophysicsShahrood University of TechnologyShahroodIran

Ultrasonic waves have a lot of use in the particle surface *** flotation is one of the methods associated with surface properties,this paper investigates the effect of these waves on performance,particle size,reagents,and feed ash content in coal *** accomplish this goal,coal samples in three size fractions,including coarse(-800 to+400μm),medium(-400 to+100 μm)and fine(-100μm)with various feed ash *** flotation experiments were evaluated by process indexes such as yield,combustible recovery,and selectivity *** results indicated the increasing of *** increasing was significant in medium ***,the results showed that in presence of ultrasonic waves,the collector and frother consumption *** also,applying ultrasonic waves would result more combustible recovery and selectivity *** ash selectivity index had the highest impact for high feed ash content.

关键词： Flotation Ultrasonic waves Coal Particle size Reagents Feed ash

Effect of Zataria multiflora Extract on Total and Differential White Blood Cell Count and Endothelin Level in Blood of Ovalbumin Sensitized Guinea Pigs

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Chinese Journal of Integrative Medicine 2020年第8期26卷 604-608页

作者： mohammad hossein Boskabady Sediqeh Jalali Neurogenic Inflammation Research Center and Department of Physiology School of MedicineMashhadIran Department of Biology Payam Noor UniversityTehranIran

Objective:To investigate the effect of hydro-ethanolic extract of Zataria multiflora(***)on endothelin level,total and differential white blood cells(WBC)count of sensitized guinea ***:Five groups of guinea pigs sensitized to ovalbumin(OA)were given drinking water alone(group S),drinking water containing three concentrations of ***(0.2,0.4 and 0.8 mg/mL as groups S+Z1,S+Z2 and S+Z3)and dexamethasone(group S+D),n=6 for each *** endothelin levels as well as total and differential WBC count in blood of sensitized and control guinea pigs were evaluated using enzyme linked immunosorbent assay method,and hemocytometer and Wright-Giemsa’s staining of blood sample smear ***:Blood endothelin levels,total and most differential WBC count were increased but lymphocytes decreased in sensitized animals compared to controls(all P<0.01).In groups S+D,S+Z2 and S+Z3 endothelin level,total and differential WBC counts were significantly improved compared with group S(P<0.01).Although,all measured parameters in group S+Z1 was lower than group S+D(P<0.01),some parameters in group S+Z3 were greater than in group S+D(P<0.05 to P<0.01).Conclusion:The results showed an anti-inflammatory effect of *** extract in sensitized guinea pigs,which may suggest a therapeutic potential for the plant on asthma.

关键词： Zataria multiflora asthma endothelin level white blood cell sensitization

Towards skin polarization characterization using polarimetric technique

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2009年第8期10卷 602-608页

作者： Pejhman GHASSEMI mohammad hossein MIRANBAYGI Biomedical Engineering Group Department of Electrical and Computer EngineeringTarbiat Modares University

Measurement of optical properties of skin is an expanding and growing field of *** studies have shown that the biological tissue,especially skin,changes the polarization state of the incident *** this property will enable the study of abnormalities and diseases that alter not only the light intensity but also its polarization *** this paper we report an experimental study for measuring changes of polarization state of the light scattered from a phantom similar to a sample model of scattering *** the notation of Stokes vector for the polarized light and Mueller matrix for the sample with its polarization properties,we have shown that some elements of the matrix were particularly sensitive to the changes of the polarization-altering physical properties of the scatterers within the phantom.

关键词： Polarization Skin Phantom Scattering polarimetry Mueller matrix Stokes vector

Prediction of rotary drilling penetration rate in iron ore oxides using rock engineering system

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International Journal of Mining Science and Technology 2018年第3期28卷 407-413页

作者： hossein Inanloo Arabi Shad Farhang Sereshki mohammad Ataei mohammad Karamoozian Department of Mining Petroleum and Geophysics Shahrood University of Technology

Prediction of the drilling penetration rate is one of the important parameters in mining operations. This parameter has a direct impact on the mine planning and cost of mining operations, Generally, effective parameters on the penetration rate is divided into two classes： rock mass properties and specifications of the machine, The chemical components of intact rock have a direct effect in determining rock mechan- ical properties, Theses parameters usually have not been investigated in any research on the rock drill- ability, In this study, physical and mechanical properties of iron ore were studied based on the amount of magnetite percent, According to the results of the tests, the effective parameters on the pen- etration rate of the rotary drilling machines were divided into three classes： specifications of the machi- nes, rock mass properties and chemical component of intact rock, Then, the rock drillahility was studied using rock engineering systems, The results showed that feed, rotation, rock mass index and iron oxide percent have important effect on penetration rate, Then a quadratic equation with 0,896 determination coefficient has been obtained, Also, the results showed that chemical components can he described as new parameters in rotary drill penetration rate,

关键词： Penetration rate Rotary drill Rock engineering system Chemical components

Cyclam Modified Carbon Paste Electrode as a Potentiometric Sensor For Determination of Cobalt(Ⅱ) Ions

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Chemical Research in Chinese Universities 2005年第1期21卷 28-31页

作者： Hamid Reza POURETEDAL mohammad hossein KESHAVARZ Chemistry Department Malek-ashtar University of Technology Shahin-shahr P. O. Box 83154/115 IranChemistry Department Malek-ashtar University of Technology Shahin-shahr P. O. Box 83154/115 Iran

A new modified carbon paste electrode based on cyclam as a modifier was prepared for the determination of Co(Ⅱ) ions. The proposed electrode shows a Nernstian slope 28.4 mV per decade over a wide concentration range 5.0×10 -6_1.0×10 -1 mol/L of Co 2+ ions with detection limit 2.5×10 -6 mol/L. The sensor exhibits good selectivities for Co 2+ over a wide variety of other cations. It can be used as an indicator electrode in potentiometric titration of cobalt(Ⅱ) ions as well as in direct determination of cobalt(Ⅱ) ions in wastewater of acidic cobalt electroplating bath. The electrode shows Nernestian behavior in a solution of 25% ethanol.

关键词： Carbon paste electrode Cyclam Potentiometry Cobalt

Modeling the effects of demand response on generation expansion planning in restructured power systems

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Journal of Zhejiang University-Science C(Computers and Electronics) 2013年第12期14卷 966-976页

作者： Mahdi SAMADI mohammad hossein JAVIDI mohammad Sadegh GHAZIZADEH Department of Electrical Engineering Ferdowsi University of MashhadMashhadIran Department of Electrical Engineering Power and Water University of TechnologyTehranIran

Demand response is becoming a promising field of study in operation and planning of restructured power systems. More attention has recently been paid to demand response programs. Customers can contribute to the operation of power systems by deployment demand response. The growth of customers' participation in such programs may affect the planning of power systems. Therefore, it seems necessary to consider the effects of demand response in planning approaches. In this paper, the impact of demand responsiveness on decision making in generation expansion planning is modeled. Avoidance or deferment in installation of new generating units is comprehensively investigated and evaluated by introducing a new simple index. The effects of demand responsiveness are studied from the points of view of both customers and generation companies. The proposed model has been applied to a modified IEEE 30-bus system and the results of the study are discussed. Simulation results show that reducing just 3% of the customers' demand(due to price elasticity) may result in a benefit of about 10% for customers in the long term.

关键词： Demand response Generation expansion planning Responsive demand

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)

Numerical simulation of two-phase flow in fractured porous media using streamline simulation and IMPES methods and comparing results with a commercial software

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Journal of Central South University 2016年第10期23卷 2630-2637页

作者： Mahmoud Ahmadpour Majid Siavashi mohammad hossein Doranehgard Applied Multi-Phase Fluid Dynamics Lab. School of Mechanical Engineering Iran University of Science and Technology

Streamline simulation is developed to simulate waterflooding in fractured reservoirs. Conventional reservoir simulation methods for fluid flow simulation in large and complex reservoirs are very costly and time consuming. In streamline method, transport equations are solved on one-dimensional streamlines to reduce the computation time with less memory for simulation. First, pressure equation is solved on an Eulerian grid and streamlines are traced. Defining the "time of flight", saturation equations are mapped and solved on streamlines. Finally, the results are mapped back on Eulerian grid and the process is repeated until the simulation end time. The waterflooding process is considered in a fractured reservoir using the dual porosity model. Afterwards, a computational code is developed to solve the same problem by the IMPES method and the results of streamline simulation are compared to those of the IMPES and a commercial software. Finally, the accuracy and efficiency of streamline simulator for simulation of two-phase flow in fractured reservoirs has been proved.

关键词： two-phase flow porous media fractured reservoirs streamline simulation dual porosity implicit pressure-explicit saturation