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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

Smart component monitoring system increases the efficiency of photovoltaic plants

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Clean Energy 2023年第2期7卷 I0001-I0009,312页

作者： Hassan yazdani Mehdi Radmehr Alireza Ghorbani Department of Electrical Engineering Sari BranchIslamic Azad UniversitySariIran

Due to the increasing expansion of renewable energy,especially the widespread installation of solar power plants worldwide,to better exploit and increase the efficiency and quality of power generation,we need to closely monitor the performance of important components of the *** this study,using an innovative smart monitoring system and electronic sensors,we monitored compo-nents such as power in photovoltaic(PV)arrays in real time,including the phenomenon of hot spots as an example of power loss in PV *** of hot spots is very difficult to deal with in a large power *** results also demonstrated smart monitoring that increased detection speed and increased the efficiency rate per supervisory technician by≤36% compared with the previous ef-ficiency rate,which was 10% per technical staff,and increased the quality of the operation of each solar power *** this paper,meteorological data were coordinated with research data to validate the ***,to compare the results of using the smart monitoring method with the conventional observation method,a complete diagram of a 5-kW solar system in MATLAB■2018 was simulated and output diagrams were ***,to provide a comprehensive validation,our research results were com-pared with technical data obtained from a local 5-kW solar power plant located in Sari,Iran(36°33ʹ48″N,53°03ʹ36″E)with an average annual irradiation of 1490 kWh/m^(2).When the simulation results and research are analysed,it is clear that the smart and real-time monitoring approach brings various benefits to solar power plants.

关键词： photovoltaic power plant online monitoring efficiency solar cell power PV modules

Wear Resistance of Two Nanostructural Bainitic Steels with Different Amounts of Mn and Ni

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Acta Metallurgica Sinica(English Letters) 2016年第6期29卷 587-594页

作者： Saman Ahmadi Miab Behzad Avishan Sasan yazdani Faculty of Materials Engineering Sahand University of Technology Department of Materials Engineering Azarbaijan Shahid Madani University

Extremely valuable mechanical properties in combination with acceptable wear resistance can make nanostructural bainitic steels to be used extensively in different engineering and tribological applications. However, it is critical to characterize the contributed factors to investigate the wear response of these high-strength materials. This work aims to study the wear behavior of two nanostructural bainitic steels with different amount of austenite stabilizer elements Mn and Ni. For this purpose, wear resistances of the materials were evaluated using the pin-on-disk method. The results indicated that the hardness of the sample is a critical factor affecting the tribological behavior, and the volume fraction and morphology of high-carbon retained austenite are also of considerable importance. It has also been demonstrated that transformation-induced plasticity effect during the wear test and oxide formation at worn surfaces are critical factors.

关键词： Nanostructural bainitic steel Wear Retained austenite TRIP

Recent progress on in situ characterizations of electrochemically intercalated transition metal dichalcogenides

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Nano Research 2019年第9期12卷 2126-2139页

作者： Sajad yazdani Milad Yarali Judy J. Cha Department of Mechanical Engineering and Materials Science Yale UniversityNew HavenCT 06511USA Energy Sciences Institute Yale University West CampusWest HavenCT 06516USA

Layered transition metal dichalcogenides(TMDCs)have been extensively studied owing to their unique physical and chemical *** van der Waals(vdW)interact!ons betwee n the stacki ng layers of TMDCs allow intercalati on of various species including mono vale nt alkali,divale nt alkaline earth and multivale nt metal ions,zero-vale nt transiti on metals,as well as orga nic molecules,all of which can drastically alter fun dame ntal properties of the *** urge to understa nd the phe nomena and the desire to exploit them for applicati ons have inspired a great deal of investigations.A large portion of the mystery has been unveiled over the past decade of intense research;however,many questions remain open and require further *** review is concerned with investigations on structural and electronic evolution of TMDCs drive n by electrochemically con trolled in tercalati ***,we aim to survey the rece nt adva nces and experime ntal platforms for mon itoring the in tercalati on processes in situ by utilizi ng nano *** additi on,several in quiries and prospects are outlined in a broader con text for future ave nues of studies.

关键词： transition metal dichalcogenides electrochemical intercalation in situ characterizations transmission electron microscopy(TEM) magnetotransport measurements

Synergistic effect of seawater's parameters on the corrosion rate of the austenitic stainless steel 304

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Acta Metallurgica Sinica(English Letters) 2010年第3期23卷 161-170页

作者： S.Atashin M.Pakshir A.yazdani Department of Materials Science and Engineering Shiraz University

In this article the corrosion rate of the austenitic stainless steel type 304, under the synergistic effect of environmental factors has been assessed via potentiodynamic polarization ***, velocity, pH and temperature are the factors which induce effects on the corrosion rate of the considered *** analysis is applied using the full two-level factorial experimental design method, which results in the contribution value of each parameter in changing the quantity of average corrosion rate in both individual and synergistic *** this quantitative analysis, qualitative analysis has been used to predict the variation *** two analyses show the important role of the synergistic action, which changes the variation direction of corrosion rate and the contribution percentage of each parameter in varying the value of corrosion *** both these analyses can show the magnitude and quality of each parameter＇s effect, which is remarkably valuable in marine applications.

关键词： Stainless steel 304 Environmental parameters Seawater corrosion Synergistic effect

Coeliac disease as a potential cause of idiopathic portal hypertension:a case report

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Gastroenterology Report 2018年第2期6卷 149-151,I0003页

作者： Saeid yazdani Ahmad Abdizadeh Faculty of Medicine Islamic Azad UniversityTehranIran

Idiopathic portal hypertension is a disorder that has various clinical *** is mostly characterized by bleeding oesophageal varices,obvious splenomegaly,anaemia and,occasionally,jaundice and *** we described an interesting case of idiopathic portal hypertension caused by coeliac disease in a 38-year-old *** putting this patient on a gluten-free diet,liver function tests became normal and portal vein diameter returned to normal *** report indicates that,in coeliac disease,repetitive stimulation by antigens along the portal vein—and immune responses to them—can result in the development of idiopathic portal hypertension.

关键词： idiopathic portal hypertension coeliac disease

FINITE ELEMENT SOLUTION OF MULTI-SCALE TRANSPORT PROBLEMS USING THE LEAST SQUARES-BASED BUBBLE FUNCTION ENRICHMENT

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International Journal of Modeling, Simulation, and Scientific Computing 2012年第4期3卷 115-131页

作者： A.yazdani V.NASSEHI Department of Civil and Environmental Engineering Rice University Houston TX 77005USA Department of Chemical Engineering Loughborough University Loughborough LE113TUUK

This paper presents a technique for deriving least-squares-based polynomial bubble functions to enrich the standard linear finite elements,employed in the formulation of Galerkin weighted-residual *** element-level linear shape functions are enhanced using supplementary polynomial bubble functions with undetermined *** enhanced shape functions are inserted into the model equation and the residual functional is constructed and minimized by using the method of the least squares,resulting in an algebraic system of equations which can be solved to determine the unknown polynomial coefficients in terms of element-level nodal *** stiffness matrices are subsequently formed with the standard finite elements assembly procedures followed by using these enriched elements which require no additional nodes to be introduced and no extra degree of freedom ***,the proposed technique is tested on a number of benchmark linear transport equations where the quadratic and cubic bubble functions are derived and the numerical results are compared against the exact and standard linear element *** is demonstrated that low order bubble enriched elements provide more accurate approximations for the exact analytical solutions than the standard linear elements at no extra computational cost in spite of using relatively crude *** the other hand,it is observed that a satisfactory solution of the strongly convection-dominated transport problems may require element enrichment by using significantly higher order polynomial bubble functions in addition to the use of extremely fine computational meshes.

关键词： Bubble function finite elements least squares reaction-diffusion transport equation Galerkin method.

Caffeine catalyzed green synthesis of novel benzo[a][1,3]oxazino[6,5-c]phenazines via a one-pot multi-component sequential protocol in a basic ionic liquid

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Chinese Chemical Letters 2017年第6期28卷 1340-1344页

作者： Razieh Mohebat Afshin yazdani-Elah-Abadi Young Researchers and Elite Club Yazd Branch Islamic Azad University Yazd Iran Department of Biology Science and Art University Yazd Iron

Caffeine was applied as a green and natural catalyst for the one-pot,four-component sequential condensation between 2-hydroxy-1,4-naphthoquinone,aromatic 1,2-diamines,ammonium thiocyanate and acid chlorides in the presence of a basic ionic liquid（l-butyl-3-methylimidazolium hydroxide） to afford the corresponding benzo[a][1,3]oxazino[6,5-c]phenazine *** this one-pot transformation,five bonds and two new rings are efficiently *** protocol has the advantages of operational simplicity,high yields,easy workup,avoidance of hazardous or toxic catalysts and organic solvents and high chemo-and regioselectivities.

关键词： Multi-component reactions(MCRs) Green chemistry Ionic liquid Caffeine Oxazine Phenazine

Nanostructured Carbide-Free Bainite Formation in Low Carbon Steel

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Acta Metallurgica Sinica(English Letters) 2020年第12期33卷 1635-1644页

作者： Hamid Mousalou Sasan yazdani Naghi Parvini Ahmadi Behzad Avishan Faculty of Materials Engineering Sahand University of TechnologyP.O.Box:51335/1996TabrizIran Department of Materials Engineering Azarbayan Shahid Madani UniversityTabrizIran

It is an important challenge to reduce the carbon content in nanostructured bainitic steels for commercialization purposes while still being able to gain the desired microstructural characteristics in nanoscale and not to deteriorate the strength–ductility *** is the point at which an appropriate heat treatment procedure design would be an important *** article aims to investigate how to obtain nanostructured bainite in steel with 0.26 wt%carbon content by applying multi-step austempering ***-,two-and three-step austempering processes have been implemented,and proper heat treatment temperatures and approaches were selected based on dilatometry *** indicated that it has become possible to achieve bainitic ferrites and austenite fi lms with overall thicknesses of 164,145 and 132 nm and 134,105 and 90 nm at the end of one-,two-and three-step austempering heat treatments,***,microstructural characteristics resulted in enhanced mechanical properties with ultimate tensile strength(UTS)of 1435,1455 and 1428 MPa in combination with elongation levels of 15.4,13.6 and 11.4%after implementing those heat ***,it has been shown that applying the multi-step austempering heat treatments resulted in enhanced yield strength and impact toughness values due to the microstructural characteristics and proper heat treatment procedure design.

关键词： Bainite Multi-step austempering Austenite Mechanical properties Impact toughness

Interaction between B-Doped C60 Fullerene and Glycine Amino Acid from First-Principles Simulation

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Chinese Physics Letters 2010年第4期27卷 83-86页

作者： M. D. Ganji H. yazdani Department of Chemistry Islamic Azad University Ghaemshahr branch Mazandaran Iran

The possibility of formation of complexes between glycine and boron doped C60 （C59B） fullerene is investigated and compared with that of C60 fullerene by using the density functional theory calculations. It has been found that the binding of glycine to C59B generated the most stable complexes via its carbonyl oxygen active site, with a binding energy of-37.89 kcal/mol, while the glycine molecule prefers to bind to the pure C60 cage via its amino nitrogen active site, consistent with the recent experimental and theoretical studies. We have also tested the stability of the most stable Gly-C59B complex with ab initio molecular dynamics simulation, carried out at room temperature. These indicate that the B-doped C60 fullerenes seem to be more suitable materials for bindings to proteins than pure C60 fullerenes.

关键词： Surfaces interfaces and thin films Biological physics Condensed matter: structural mechanical & thermal Chemical physics and physical chemistry