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International Journal of minerals,metallurgy and materials 2024年第9期31卷 2062-2076页

作者： S.Abazari A.Shamsipur H.r.Bakhsheshi-rad m.S.Soheilirad F.Khorashadizade S.S.mirhosseini Department of materials and metallurgical Engineering Amirkabir University of TechnologyTehran ***Iran Iranian National Standards Organization of Hormozgan HormozganIran Advanced materials research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Department of materials and metallurgical Engineering Iran University of Science and TechnologyTehranIran

magnesium(mg)alloys are gaining great consideration as body implant materials due to their high biodegradability and ***,they suffer from low corrosion resistance and antibacterial *** this research,semi-powder metallurgy followed by hot extrusion was utilized to produce the magnesium oxide@graphene nanosheets/magnesium(mgO@GNS/mg)composite to improve mechanical,corrosion and cytocompatibility *** have revealed that the incorporation of mgO@GNS nanohybrids into mg-based composite enhanced microhardness and compressive *** vitro,osteoblast cell culture tests show that using mgO@GNS nanohybrid fillers enhances osteoblast adhesion and apatite *** presence of mgO@GNS nanoparticles in the composites decreased the opening defects,micro-cracks and micro-pores of the composites thus preventing the penetration of the corrosive solution into the *** demonstrated that the mgO@GNS/mg composite possesses excellent antibacterial properties because of the combination of the release of mgO and physical damage to bacterium membranes caused by the sharp edges of graphene nanosheets that can effectively damage the cell wall thereby facilitating penetration into the bacterial lipid ***,the mgO@GNS/mg composite with high mechanical strength,antibacterial activity and corrosion resistance is considered to be a promising material for load-bearing implant applications.

关键词： metal matrix composites mgO@GNS nanohybrid strengthening mechanisms antibacterial activity biocompatibility

macroalgal deep genomics illuminate multiple paths to aquatic,photosynthetic multicellularity

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molecular Plant 2024年第5期17卷 747-771页

作者： David r.Nelson Alexandra mystikou Ashish Jaiswal Cecilia rad-menendez michael J.Preston Frederik De Boever Diana C.El Assal Sarah Daakour michael W.Lomas Jean-Claude Twizere David H.Green William C.ratcliff Kourosh Salehi-Ashtiani Division of Science and math New York University Abu DhabiAbu DhabiUAE Center for Genomics and Systems Biology(CGSB) New York University Abu DhabiAbu DhabiUAE Biotechnology research Center Technology Innovation InstitutePO Box 9639Masdar CityAbu DhabiUAE Culture Collection of Algae and Protozoa Scottish Association for Marine ScienceObanScotlandUK National Center for marine Algae and microbiota Bigelow Laboratory for Ocean SciencesEast BoothbayMEUSA Laboratory of Viral Interactomes GIGA InstituteUniversity of LiegeLiegeBelgium School of Biological Sciences Georgia Institute of TechnologyAtlantaGAUSA

macroalgae are multicellular,aquatic autotrophs that play vital roles in global climate maintenance and have diverse applications in biotechnology and eco-engineering,which are directly linked to their multicellularity ***,their genomic diversity and the evolutionary mechanisms underlying multicellularity in these organisms remain *** this study,we sequenced 110 macroalgal genomes from diverse climates and phyla,and identified key genomic features that distinguish them from their microalgal *** for cell adhesion,extracellular matrix formation,cell polarity,transport,and cell differentiation distinguish macroalgae from microalgae across all three major phyla,constituting conserved and unique gene sets supporting multicellular *** genes show phylum-and climate-specific expansions that may facilitate niche ***,our study reveals genetic determinants of convergent and divergent evolutionary trajectories that have shaped morphological diversity in macroalgae and provides genome-wide frameworks to understand photosynthetic multicellular evolution in aquatic environments.

关键词： macroalgae multicellularity comparative genomics evolution adhesome endogenous viral elements

Hygroelasticity analysis of an elastically restrained functionally graded porous metamaterial circular plate resting on an auxetic material circular plate

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Applied mathematics and mechanics(English Edition) 2020年第9期41卷 1359-1380页

作者： A.BEHrAVAN-rad m.JAFArI Faculty of mechanical and mechatronics Engineering Shahrood University of TechnologyShahrood ***Iran

The main objective of this research is to investigate the hygroelastic behavior of a non-homogeneous circular plate made up of porous metamaterial resting on an auxetic material *** mechanical properties of the main plate,as well as moisture concentration,vary as an exponential function in the transverse ***’s ratio is *** elastic supporting medium is developed by considering the structurestructure *** on the linear hygroelasticity theory,the governing state equations in terms of displacements and moisture concentration are *** first,the Fickian equation is solved to compute the nonlinear distribution of moisture through the plate thickness,and then the state equations are semi-analytically solved using the statespace(SS)method and the differential quadrature(DQ)rule to predict the elastic field quantities.A comprehensive parametric analysis is accomplished to elucidate the effects of key parameters on the steady-state response of the plate under the mechanical and hygral loads.

关键词： metamaterial hygroelasticity auxeticity hygral interaction

A THrEE-DImENSIONAL ELASTICITY SOLUTION FOr TWO-DIrECTIONAL FGm ANNULAr PLATES WITH NON-UNIFOrm ELASTIC FOUNDATIONS SUBJECTED TO NOrmAL AND SHEAr TrACTIONS

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Acta mechanica Solida Sinica 2013年第6期26卷 671-690页

作者： A.Behravan rad m.Shariyat Department of mechanical Engineering Islamic Azad UniversityKaraj Branch Faculty of mechanical Engineering K.N.Toosi University of TechnologyPardis StreetMolasadra AvenueVanak SquareTehranIran

In the present paper, bending and stress analyses of two-directional functionally graded （FG） annular plates resting on non-uniform two-parameter Winkler-Pasternak founda- tions and subjected to normal and in-plane-shear tractions is investigated using the exact three- dimensional theory of elasticity. Neither the in-plane shear loading nor the influence of the two- directional material heterogeneity has been investigated by the researchers before. The solution is obtained by employing the state space and differential quadrature methods. The material proper- ties are assumed to vary in both transverse and radial directions. Three different types of variations of the stiffness of the foundation are considered in the radial direction： linear, parabolic, and sinu- soidal. The convergence analysis and the comparative studies demonstrate the high accuracy and high convergence rate of the present approach. A parametric study consisting of evaluating effects of different parameters （e.g., exponents of the material properties laws, the thickness to radius ratio, trends of variations of the foundation stiffness, and different edge conditions） is carried out. The results are reported for the first time and are discussed in detail.

关键词： three-dimensional theory of elasticity two-directionm functionally graded materi- als annular and circular plates elastic foundation differential quadrature in-plane shear

Thermal Characteristics,mechanical Properties,In Vitro Degradation and Cytotoxicity of Novel Biodegradable Zn-Al-mg and Zn-Al-mg-xBi Alloys

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Acta metallurgica Sinica(English Letters) 2017年第3期30卷 201-211页

作者： H.r.Bakhsheshi-rad E.Hamzah H.T.Low m.H.Cho m.Kasiri-Asgarani S.Farahany A.mostafas m.medraj Advanced materials research Center Department of Materials Engineering Najafabad Branch Islamic Azad University Najafabad Iran Department of materials Manufacturing and Industrial Engineering Faculty of Mechanical Engineering Universiti Teknologi Malaysia 81310 Johor Bahru Johor Malaysia research and Development Centre KISWIRE Sdn. BhdJohor Bahru Johor Malaysia Department of materials and mechanical Engineering Buein Zahra Technical University Qazvin *** Iran Department of mechanical and materials Engineering Masdar Institute of Science and TechnologyP. O. Box: 54224 Masdar City Abu Dhabi UAE Department of mechanical Engineering Concordia University 1455 De Maisonneuve Blvd. West Montreal QCH3G 1MS Canada

Ternary Zn-0.5A1-0.5mg and quatemary Zn-0.5A1-0.5mg-xBi （x = 0.1, 0.3 and 0.5） alloys were studied to evaluate the thermal and structural characteristics, mechanical properties, cytotoxicity and in vitro degradation behavior. Thermal analysis and microstructural observations showed that Zn-0.5A1-0.5mg is composed of FCC-A1 ＋ HCP- Zn ＋ mg2（Zn,A1）ll while a new phase a-mg3Bi2 appeared after the addition of Bi to the Zn-0.5A1-0.5mg ternary alloy. The results revealed that the quaternary Zn-A1-mg-Bi alloys have higher tensile strength, elongation and hardness but slightly lower corrosion resistance than those of the temary Zn-AI-mg alloy. Based on the mTT assay, the Zn-A1-mg and Zn-A1-mg-Bi alloys were found to be biocompatible, and thus, they can be considered for further investigation in an in vivo environment.

关键词： Zn-AI-mg-Bi microstructure mechanical property Corrosion Cytotoxicity

Simulation of automobile fuel consumption and emissions for various driver's manual shifting habits

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Journal of Central South University 2014年第3期21卷 1058-1066页

作者： B.mashadi Y.Amiri-rad A.Afkar m.mahmoodi-kaleybar School of Automotive Engineering Iran University of Science & Technology Department of mechanical Engineering Parand Branch Islamic Azad University

The effects of different habits of the drivers on gear shifting strategies for manual powertrain were investigated. For the realization of simulation, the shifting habits of the drivers were conducted in the Advisor software to investigate and compare the emission rates. Simulation was developed based on the optimal gear shifting strategy and criteria and was validated both in fuel economy and emissions by analyzing the results in the various driving cycle and driving styles. To explore an optimal gear shifting strategy with best fuel economy and lowest emission for a manual transmission, a strategy was designed with a highest possible gear criterion as long as the torque requirement can be satisfied. Based on two different criteria, namely the engine working conditions and the driver's intention, the governing parameters in decision making for gear shifting of manual transmission in conventional engine were discussed. It is also shown that the optimum gear shifting strategy is based on that both the engine state and the driver's intention eliminates unnecessary shiftings that are present when the intention is overlooked. The optimum shifting habit and the best driving cycle in terms of minimum emissions and fuel consumption were proposed.

关键词： gear shifting strategies driving cycle driver model Advisor

magnesium-based nanocomposites:A review from mechanical,creep and fatigue properties

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Journal of magnesium and Alloys 2023年第8期11卷 2655-2687页

作者： S.Abazari A.Shamsipur H.r.Bakhsheshi-rad J.W.Drelich J.Goldman S.Sharif A.F.Ismail m.razzaghi Department of materials and metallurgical Engineering Amirkabir University of TechnologyTehranIran Advanced materials research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Department of materials Science and Engineering Michigan Technological UniversityHoughtonMI 49931USA Department of Biomedical Engineering Michigan Technological UniversityHoughtonMI 49931USA Advanced manufacturing research Group Faculty of Mechanical EngineeringUniversiti Teknologi MalaysiaJohor Bahru 81310JohorMalaysia Advanced membrane Technology research Center(AmTEC) Universiti Teknologi MalaysiaJohor Bahru 81310JohorMalaysia

The addition of nanoscale additions to magnesium(mg)based alloys can boost mechanical characteristics without noticeably decreasing *** mg is the lightest structural material,the mg-based nanocomposites(NCs)with improved mechanical properties are appealing materials for lightweight structural *** contrast to conventional mg-based composites,the incorporation of nano-sized reinforcing particles noticeably boosts the strength of mg-based nanocomposites without significantly reducing the *** present article reviews mg-based metal matrix nanocomposites(mmNCs)with metallic and ceramic additions,fabricated via both solid-based(sintering and powder metallurgy)and liquid-based(disintegrated melt deposition)*** also reviews strengthening models and mechanisms that have been proposed to explain the improved mechanical characteristics of mg-based alloys and ***,synergistic strengthening mecha-nisms in mg matrix nanocomposites and the dominant equations for quantitatively predicting mechanical properties are ***,this study offers an overview of the creep and fatigue behavior of mg-based alloys and nanocomposites using both traditional(uniaxial)and depth-sensing indentation *** potential applications of magnesium-based alloys and nanocomposites are also surveyed.

关键词： magnesium-based nanocomposites Nanoreinforcement Strengthening mechanisms Creep properties Fatigue properties

Irrigation effects on diameter growth of 2-year-old Paulownia tomentosa saplings

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Journal of Forestry research 2015年第1期26卷 153-157页

作者： Javad Eshaghi rad Seyed rostam mousavi mirkala Department of Forestry Faculty of Natural ResourcesUrmia University

Species of Paulownia are fast-growing trees that are planted in many countries in green spaces and agroforestry systems. We studied the influence of irrigation on the diameter growth of 2-year-old Paulownia tomentosa saplings planted in 3 m 9 3 m grids at Nazlou Campus of Urmia University, Iran. Completely randomized experimental design was used with four irrigation amount, viz.10, 15, 20 and 25 L, and three irrigation intervals, viz. 3-and 6-days, in 8 replications. During the growth season, we measured collar diameters of all saplings at the end of each month. Diameter growth declined with reduced irrigation amount and increased irrigation interval. The lowest average diameter growth（9 mm） was recorded for 10 L water at 6-day intervals and maximum average diameter growth（28.7 mm） was recorded for 25 L volume at 3-day intervals. The latter treatment resulted in significantly greater diameter growth than any other treatment（except20 L at 3-day intervals）. more than 80 % of diameter growth was achieved in the first 3 months. Therefore, it is essential to irrigate with 25 L of water at 3-day intervals during the first three growth months to achieve maximum diameter growth for 2-year-old P. tomentosa saplings.

关键词： Paulownia tomentosa Diameter growth Irrigation interval Iran

Effects of chronic and subtoxic chlorobenzenes on adrenocorticotrophic hormone release

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Journal of Environmental Sciences 2015年第8期27卷 165-170页

作者： Zsolt molnár regina Pálf?ldi Anna László marianna radács Krisztián Sepp Péter Hausinger László Tiszlavicz Zsuzsanna Valkusz márta Gálfi Institute of Applied Science Department of Environmental Biology and Education Gyula Juhász Faculty of Education University of Szeged Department of Pulmonology Faculty of Medicine University of Szeged Department of medical Physics and Informatics Faculty of Medicine University of Szeged Endocrine Unit of First Department of Internal medicine Faculty of Medicine University of Szeged Invasive Cardiology Department Second Department of Internal Medicine and Cardiology Faculty of Medicine University of Szeged Department of Pathology Faculty of Medicine University of Szeged

many environmental chemicals and pesticides have been found to alter neuroendocrine communication in exposed biological objects. The environmental loads have primary and secondary effects that can alter the homeostatic regulation potential. Since it is difficult to avoid human exposition, a potentially important area of research to develop in vivo and in vitro experimental models. In this context, the primary aim of this study was to demonstrate the effects of chlorobenzenes on adrenocorticotrophic hormone（ACTH） release. In our experimental study, male Wistar rats were exposed to 0.1, 1.0 and 10 μg/b.w.（body weight） kg of 1,2,4-trichlorobenzene and hexachlorobenzene（Cl B） mix via gastric tube for 30, 60 or 90 days. At the endpoints of the experiment blood samples were taken and animals were decapitated. Primary,monolayer adenohypophysis cell cultures were prepared by enzymatic and mechanical digestion. The ACTH hormone content in serum and supernatant media was measured by immuno-chemiluminescence assay. The mg2＋-dependent ATPase activity was determined by modified method of martin and Dotty. Significant differences were detected in the hormone release between the control and treated groups. The hormone release was enhanced characteristically in exposed groups depending upon the dose and duration of exposure. The mg2＋-ATPase activity enhanced after chronic and subtoxic Cl B exposition. Light microscopy revealed that the adenohypophysis seemed to be more abundant. results indicate that Wistar rats exposed to subtoxic Cl B have direct and indirect effects on hypothalamus–hypophysis–adrenal axis.

关键词： Chlorobenzenes Subtoxic Adrenocorticotrophic hormone release mg2+ -dependent ATPase