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Shoreline spatial and temporal response to natural and human effects in Boujagh National Park, Iran

International Journal of Sediment Research 2021年第5期36卷 582-592页

作者： Morteza Karimi Jamal Mohammad Vali Samani mehdi mazaheri Department of Water Structures Tarbiat Modares University Academic Center for Education Culture and Research (ACECR) Environmental Research Institute

Shoreline variation and river deltas are among the most dynamic systems in marine environments. The related different variations in spatial and temporal scales play significant roles in land planning and different management applications. Modeling the dynamics of seashore of Boujagh National Park(BNP)which is located on the southern coast of the Caspian Sea in the Sefidrud Delta(SD), considering natural and anthropogenic factors, was the main objective of the current study. To achieve this goal, a combination of remote sensing data, historical data, and numerical simulations was utilized. The BNP covers an area of 3,270 ha and includes two international wetlands, Boujagh and Kiashahr. In earlier periods, this area faced severe morphological changes whereas recently its shoreline has experienced gradual variations. Accordingly, at the first stage, the shoreline variation from 2006 to 2017 was extracted by processing and classifying Operational Land Imager(OLI) and Thematic Mapper(TM) images from Landsat satellites using the Maximum Likelihood approach. In the second stage, the two dimensional MIKE21 model was utilized to identify wave and coastal current patterns and parameters for the year ***, the results showed that, the shoreline of the BNP is affected by several natural and anthropogenic factors. Seaward advancement of the shoreline occurred in zones A(east zone) and C(west zone) due to Caspian Sea Level drop and sedimentation while retreating occurred at Zone B(north zone) influenced by wave and current patterns and reduction of the Sefidrud River flows. Also, the results imply that maintaining the existing conditions results in the disappearance of a considerable part of the ecological area in the BNP. Hence, to manage and preserve the coastline of the BNP complying with the current anthropogenic and natural factors, it is vital to take necessary management measures.

关键词： Shoreline dynamics Boujagh National Park Remote sensing MIKE21 Wave and current

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Surfactant-Free Production of Ni-Based Nanostructures

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Materials Sciences and Applications 2011年第5期2卷 444-452页

作者： Yaser Bahari Mollamahaleh Davood Hosseini mehdi mazaheri Sayed Khatiboleslam Sadrnezhaad 不详

This paper introduces a facile surfactant-free method for fabrication of different types of Ni-based nanostructures including metallic nickel nanoparticles (MNNP), nickel oxide nanoparticles (NONP) and chip-like nickel oxide nanoflakes (CNONF) by solvothermal technique at 190°C. Nickel acetyl acetonate (Ni(ac ac)2) was used as nickel precursor for both MNNP and CNONF and NiCO3●2Ni(OH)2●nH2O was utilized for NONP. Organic alcohols including 1-hexanol and benzyl alcohol were used as solvent to produce all powders. The crystallite sizes of MNNP, NONP and CNONF were determined by X-ray diffraction (XRD) to be 30, 9 and 27 nm, respectively. Electron microscopy indicated final particle sizes of 80 nm and 20 nm for MNNP and NONP, respectively and a thickness-layer less than 90 nm for CNONF. Brunauer-Emmett-Teller (BET) experiment determined a high surface area of 68 m2/gr for CNONF.

关键词： Nanoparticles Nickel Nickel Oxide Chip-Like Nanoflakes Solvothermal Technique

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Bending analysis of five-layer curved functionally graded sandwich panel in magnetic field:closed-form solution

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Applied Mathematics and Mechanics(English Edition) 2021年第2期42卷 251-274页

作者： M.SHABAN H.mazaheri Mechanical Engineering Department Bu-Ali Sina UniversityHamadan 3869-6517Iran

In this paper,an exact closed-form solution for a curved sandwich panel with two piezoelectric layers as actuator and sensor that are inserted in the top and bottom facings is *** core is made from functionally graded(FG)material that has heterogeneous power-law distribution through the radial *** is assumed that the core is subjected to a magnetic field whereas the core is covered by two insulated composite *** determine the exact solution,first characteristic equations are derived for different material types in a polar coordinate system,namely,magneto-elastic,elastic,and electro-elastic for the FG,orthotropic,and piezoelectric materials,*** displacement-based method is used instead of the stress-based method to derive a set of closed-form real-valued solutions for both real and complex *** on the elasticity theory,exact solutions for the governing equations are determined layer-by-layer that are considerably more accurate than typical simplified *** accuracy of the presented method is compared and validated with the available literature and the finite element *** effects of geometrical and material parameters such as FG index,angular span along with external conditions such as magnetic field,mechanical pressure,and electrical difference are investigated in detail through numerical examples.

关键词： five-layer sandwich panel piezoelectric material closed-form solution functionally graded(FG)material magnetic field

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Design and optimization of nano-antenna for thermal ablation of liver cancer cells

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Chinese Physics B 2021年第4期30卷 574-585页

作者： Mohammad Javad Rabienejhad Azardokht mazaheri Mahdi Davoudi-Darareh Optics and Laser Science and Technology Research Center Malek Ashtar University of TechnologyShahinshahrIran Department of Physics University of IsfahanIran Faculty of Science Malek Ashtar University of TechnologyShahinshahrIran

One method of cancer therapy is to utilize nano-antenna for thermal *** this method,the electromagnetic waves emitted from the nano-antenna are absorbed by the tissue and lead to heating of cancer *** temperature of cancer cells reaches a threshold,they will begin to *** this purpose,an L-shaped frame nano-antenna(LSFNA) is designed to introduce into the biological ***,the radiation characteristics of the LSFNA such as near and far-field intensities,directivity,and sensitivity to its gap width are studied to the optimization of the *** bio-heat and Maxwell equations are solved using the finite element *** prevent damage to healthy tissues in this method,the antenna radiation must be completely controlled and performed ***,penetration depth,special absorption rate,temperature distribution,and the fraction of tissue necrosis are analyzed in the biological *** is why the design and optimization of the nano-antennas as a radiation source is ***,a pulsed source is used to excite the ***,focusing and efficiency of the nano-antenna radiation on the cancer cell is tuned using an adjustable liquid crystal *** focus of this lens is changing under an electric field applied to its surrounding cathode.

关键词： cancer therapy directivity far-field intensity hyperthermia liver cancer nano-antenna thermalablation tunable liquid crystal lens

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Design and optimization of a nano-antenna hybrid structure for solar energy harvesting application

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Chinese Physics B 2021年第9期30卷 606-617页

作者： Mohammad Javad Rabienejhad Mahdi Davoudi-Darareh Azardokht mazaheri Optics and Laser Science and Technology Research Center Malek Ashtar University of TechnologyShahinshahrIran Faculty of Science Department of PhysicsMalek Ashtar University of TechnologyShahinshahrIran Department of Physics University of IsfahanIran

A novel hybrid structure with high responsivity and efficiency is proposed based on an L-shaped frame nano-antenna(LSFNA)array for solar energy harvesting ***,two types of LSFNAs are designed and optimized to enhance the harvesting characteristics of traditional simple electric dipole nano-antenna(SEDNA).The LSFNA geometrical dimensions are optimized to have the best values for the required input impedance at three resonance wavelengths ofλ_(res)=10μm,15μm,and 20μ*** the LSFNAs with three different sizes are modeled like a planar spiral-shaped array(PSSA).Also,a fractal bowtie nano-antenna is connected with the PSSA in the array *** proposed hybrid structure consists of two main elements:(I)Three different sizes of the LSFNAs with two different material types are designed based on the thin-film metal-insulator-metal diodes that are a proper method for infrared energy harvesting.(Ⅱ)The PSSA gap is designed based on the electron field emission proposed by the Fowler-Nordheim theory for the array ***,the proposed device is *** results show that the PSSA not only has an averaged 3-time enhancement in the harvesting characteristics(such as return loss,harvesting efficiency,etc.)than the previously proposed structures but also is a multi-resonance wide-band ***,the proposed antenna takes up less space in the electronic circuit and has an easy implementation process.

关键词： field electron emission infrared metal-insulator-metal(MIM)diode nano-antenna photovoltaic effects rectification solar energy harvesting

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Enhancing optomechanical force sensing via precooling and quantum noise cancellation

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Science China(Physics,Mechanics & Astronomy) 2020年第1期63卷 44-54页

作者： Tesfay Gebremariam Ye-Xiong Zeng Mojtaba mazaheri Chong Li Department of Physics Ar ba Minch UniversityAr ba Minch 21Ethiopia School of Physics Dalian University of TechnologyDalian 116024China Department of Basic Science Hamedan University of TechnologyHamedan 65169-1-3733Iran

We theoretically investigate optomechanical force sensing via precooling and quantum noise cancellation in two coupled cavity optomechanical systems. We show that force sensing based on the reduction of noise can be used to dramatically enhance the force sensing and that the precooling process can effectively improve the quantum noise cancellation. Specifically, we examine the effect of optomechanical cooling and noise reduction on the spectral density of the noise of the force measurement; these processes can significantly enhance the performance of optomechanical force sensing, and setting up the system in the resolved sideband regime can lead to an optimization of the cooling processes in a hybrid system. Such a scheme serves as a promising platform for quantum back-action-evading measurements of the motion and a framework for an optomechanical force sensor.

关键词： hybrid optomechanical system coherent quantum noise cancellation force sensing

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Electrochemical Behavior of Passive Films Formed on the Surface of Coarse-,Fine-and Ultra-fine-Grained AA1050 Based on a Modified PDM

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Acta Metallurgica Sinica(English Letters) 2016年第7期29卷 629-637页

作者： Seyed Omid Gashti Arash Fattah-alhosseini Yousef mazaheri Department of Materials Engineering Bu-Ali Sina University

Electrochemical impedance spectroscopy （EIS） and Mott-Schottky analysis were carried out to evaluate the electrochemical behavior of the passive films formed on the surface of coarse-grained （CG）, fine-grained （FG） and ultrafine-grained （UFG） 1050 A1 alloy （AA1050） samples in alkaline media （pH value of 8.0） based on a modification of point defect model （PDM）. The EIS results revealed that the polarization resistance increased from about 22.71-120.33 kΩ cm2 for UFG sample when compared to CG sample （annealed sample）. The semiconductor properties of the passive films formed on CG, FG and UFG AA1050 samples in the test solution were investigated by employing Mott-Schottky analysis in conjunction with PDM. The results indicated that donor densities were in the range of 2.19 × 1021-0.61 × 1021 cm-3 and decreased with grain refinement. Finally, all electrochemical tests showed that the electrochemical behavior of AA1050 alloy was improved by decreasing the grain size, mainly due to the formation of thicker and less defective oxide films.

关键词： AA1050 alloy Grain refinement Ultra-fine grain (UFG) Passive film Mott-Schottky

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Acetone Adsorption on Pristine and Pt-doped Graphene:A First-Principles vdW-DF Study

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Communications in Theoretical Physics 2015年第11期64卷 576-582页

作者： Masoud Darvish Ganji Hoda mazaheri Azadeh Khosravi Department of Nanochemistry Faculty of Pharmaceutical Chemistry Pharmaceutical Sciences BranchIslamic Azad University Department of Chemistry Qaemshahr BranchIslamic Azad University Young Researchers and Elite Club Central Tehran BranchIslamic Azad University

Using van der Waals corrected density functional theory(vdW-DF) method we have investigated the adsorption of acetone molecule on pristine and Pt-doped *** active sites for both the interacting systems have been considered in the adsorption process including full geometry *** have analyzed the structural and electrical properties of energetically favorable *** results show that adsorption of acetone molecule on the Pt-doped graphene is energetically *** binding energy and bonding distance are determined to be-5.277 eV and 2.206 A,respectively,accompanying with charge transfer of 1.11 ***,the Pt-0 bond is rather significantly elongated when acetone is adsorbed on Pt-doped *** to pristine graphene,the Pt-doped graphene has stronger interaction with the acetone and may provide more sensitive signai for a single acetone ***,practically,the band gap of Pt-doped graphene would become reduced after acetone ***,our first-principles study presents evidence for a coherent benchmark for the applicability of Pt-doped graphene for acetone adsorption and detection.

关键词： Pt-doped graphene acetone ab initio calculations s

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Development of a New Ultrafine/Nano Ferrite-Carbide Microstructure by Thermomechanical Processing

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Acta Metallurgica Sinica(English Letters) 2015年第2期28卷 249-253页

作者： Yousef mazaheri Ahmad Kermanpur Abbas Najafizadeh Navid Saeidi Department of Materials Engineering Isfahan University of Technology

The steel with the new microstructure, bimodal submicrometer equiaxed ferrite grains with uniformly dis- tributed nanosized cementite particles, was manufactured by a new approach utilizing simple cold-rolling and subsequent annealing of a dual phase ferrite-martensite starting structure. The mean ferrite grain size and carbide size range of the specimen after 80% cold-rolling and subsequent annealing at 600 ℃ for 20 min were 0.35 μm and 70-140 nm, respec- tively. A combination of bimodal ultrafine ferrite and nanoscale carbides used as a more effective method for achieving an excellent balance in strength-ductility. The strength of the steel with the new microstructure increased to about 880 MPa （nearly 60% higher than that of the as-received state, e.g., 540 MPa）, without significant loss of ductility.

关键词： Low-carbon steel Dilatometry Thermomechanical processing Grain refinement Mechanical properties

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Development of Al356e-Al_2O_3 Nanocomposite Coatings by High Velocity Oxy-fuel Technique

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Journal of Materials Science & Technology 2013年第9期29卷 813-820页

作者： Y.mazaheri F.Karimzadeh M.H.Enayati Department of Materials Engineering Isfahan University of Technology

In this research, development of AI356-AI203 nanocomposite coatings has been investigated. AI356-AI203 composite powders were prepared by mechanical milling of AI356 powder and 5 vol.% micro and nanoscaled alumina particles. The milled powders were used as feedstock to deposit composite coatings on A356-T6 aluminum alloy substrate using high velocity oxy-fuel （HVOF） process. X-ray diffractometry, optical and scanning electron microscopy, microhardness and wear tests were used to characterize the composite powders and coatings. The hardness of composite coatings containing micro and nanosized AI203 were 114.1 ± 5.9 HV and 138.4 ± 6.9 HV, respectively which were higher than those for substrate （79.2 ± 1.1 HV）. Nano and microcomposite coatings revealed low friction coefficients and wear rates, which were significantly lower than those obtained for AI356-T6 substrate. Addition of 5 vol.% micro and nanoscaled alumina particles improved the wear resistance by an average of 85% and 91%, respectively. This is mainly caused by the presence of AI203 in matrix and nanocrystalline structure of matrix. Scanning electron microscopy tests revealed different wear mechanisms on the surface of the wear test specimens.

关键词： AI356-AI203 nanocomposite Composite coatings Mechanical milling High velocity oxy-fuel (HVOF) Wear

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