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Entanglement of three-level atomic system and spontaneous emission fields in a vacuum and near the 1D photonic crystal band gap

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Optoelectronics Letters 2022年第11期18卷 687-693页

作者： Jalil Shiri javad Khalilzadeh Seyyed Hossein Asadpour Department of Photonics Faculty of SciencesImam Hossein UniversityTehranlran Young Researchers and Elite Club Central Tehran BranchIslamic Azad UniversityTehranIlran

The time evolution of the quantum entropy in a GaAs/AlAs one-dimensional photonic crystal(1DPC) with an atomic system defect layer is investigated in this work. The entanglement between atomic system and their spontaneous emission fields near the edge of the photonic band gap(PBG) is coherently controlled by the coupling field. Comparison between the atom-photon entanglement of the atomic system in the vacuum surrounding and that near the PBG of the 1DPC shows that the degree of entanglement strongly depends on the PBG. We find that degree of entanglement is strongly dependent on the intensity and detuning of the coupling and probe fields. Furthermore, the effect of the phase difference between applied fields on the atom-photon entanglement is studied. The potentially possible technological applications can be provided by the proposed model in the quantum optics and quantum communications based on photonic crystal.

关键词： field system vacuum

Anisotropy of mechanical properties and crystallographic texture in hot rolled AZ31+XSr sheets

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Journal of Magnesium and Alloys 2019年第3期7卷 466-473页

作者： Alireza Sadeghi Hossein Mortezapour javad Samei Mihriban Pekguleryuz David Wilkinson School of Mechanical Engineering College of EngineeringUniversity of TehranTehranIran Department of Materials Science and Engineering McMaster UniversityHamiltonONCanada Department of Mining and Materials Science McGill UniversityMontrealQCCanada

The influences of Sr on the microstructure,texture and mechanical properties including flow and anisotropy behavior of AZ31 alloys are *** containing no,0.4 and 0.8 wt%of strontium were cast and subjected to hot *** indicate that Sr reduces the basal texture intensity(23%in the AZ31+0.8Sr alloy)and homogenizes the distribution of strain in uniaxial ***,Sr increases both the strength coefficient and the strain hardening exponent in all *** the transverse direction,enhancements are more ***,Sr enhances the combination of tensile strength and total elongation;i.e.,toughness,whether tests are performed parallel to the rolling,diagonal or transverse directions,to significant extents.

关键词： AZ31 Hot rolling Mechanical properties Microstructure Strontium Texture

Thermo-hydro-mechanical modeling of fault discontinuities using zero-thickness interface element

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第1期12卷 74-88页

作者： Ali Ranjbar Hossein Hassani Kourosh Shahriar Mohammad javad Ameri Shahrabi Department of Petroleum Engineering Amirkabir University of TechnologyTehranIran Department of Mining and Metallurgy Engineering Amirkabir University of TechnologyTehranIran

In this paper,a coupled thermo-hydro-mechanical(THM)simulation in a faulted deformable porous medium is *** model involves solving the mass conservation,linear momentum balance,and energy balance equations which are derived from the Biot’s consolidation *** pore pressure,solid displacement,and temperature are chosen as initial variables in these equations,and the finite element method in combination with the interface element is used for spatial discretization of continuous and discontinuities(fault)parts of the medium to solve the *** main purpose of this study is providing precise formulations,applicability,and ability of the triple-node zero-thickness interface element in THM modeling of *** should be noted that the system of equations is solved using a computer code written in Matlab *** order to verify the developed method,simulations of index problems such as Mandel’s problem,and coupled modeling of a faulted porous medium and a faulted aquifer are *** modeling results obtained from the developed method show a very good agreement with those by other modeling methods,which indicates its accuracy.

关键词： Thermo-hydro-mechanical(THM) simulation Geomechanical coupling Zero-thickness element Joint element Finite element

Coupling system application in photocatalytic degradation of methylorange by TiO_2, TiO_2/SiO_2 and TiO_2/SiO_2/Ag

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Rare Metals 2015年第12期34卷 851-858页

作者： Hossein Ghasemi Mobtaker Seyed javad Ahmadi Shahram Moradi Dehaghi Taher Yousefi Nuclear Fuel Cycle Research School Nuclear Science and Technology Research Institute Faculty of Chemistry Tehran North Branch Islamic Azad University

Three different photocatalysts including TiO2, TiO2/SiO2 and TiO2/SiO2/Ag were synthesized via sol–gel growth method, in which colloidal silica was used as Si source, titanium tetra iso-propoxide (TTiP) as titanium source, Ag+ as dopant ion and hydroxypropyl cellulose (HPC) as dispersant. The purpose was to study the enhancement of photocatalytic activity of TiO2 by deposition on SiO2 colloids and also doping with Ag ion. The catalysts were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray fluorescence (XRF), Fourier transform infrared spectroscopy (FT-IR) and Brunauer–Emmett–Teller (BET) methods. It is confirmed that the major phase in all catalysts is anatase. Photocatalytic activity was studied in various conditions for degradation of methylorange (as a model pollutant) to evaluate the effect of some parameters on degradation efficiency. Studying the degradation process in various pH values reveals that the degradation is more efficient in acidic solution than alkaline condition. Coupling the photocatalytic process with some fields called electro-photochemical (EP), magnetic-photochemical (MP) and ultrasonic-photochemical (UP) was studied at two pH values which were compared with photochemical (P) alone. It is concluded that in most cases, the EP is the best coupled system and has the maximum efficiency. Liquid chromatography–mass spectrometry (LC–MS) analysis was used to check the complete decomposition of methylorange at the end of process.

关键词： Doping Electro-photochemical Magnetic-photochemical Ultrasonic-photochemical Sol–gel

Control of the hydrophobicity of rare earth oxide coatings deposited by solution precursor plasma spray by hydrocarbon adsorption

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Journal of Materials Science & Technology 2021年第3期62卷 107-118页

作者： Pengyun Xu Guohui Meng Larry Pershin javad Mostaghimi Thomas W.Coyle Centre for Advanced Coating Technologies University of TorontoTorontoON M5S 3G8Canada

The basis of the hydrophobicity of lanthanide rare earth oxides(REOs)has been the subject of considerable *** explore this question,the wetting behaviors and surface compositions of hierarchicallystructured Yb_(2)o_(3)(one of the REOs)coatings and non-REO Al_(2)o_(3)coatings deposited via solution precursor plasma spray process were investigated in this *** Yb_(2)o_(3)coatings were subjected to a number of post-deposition treatments including vacuum(1-15 Pa)treatment,Ar-plasma treatment,heat treatment(400℃),long-time air exposure and ultra-high vacuum(1×10^(-7)Pa)*** characterization showed that different post-deposition treatments resulted in different wetting behavior for the Yb_(2)o_(3)coatings which correlated with the content of hydrocarbon on the ***_(2)o_(3)coatings exhibited reversible transitions between superhydrophobicity after vacuum treatment and superhydrophilicity after Ar-plasma or heat treatment,linked to hydrocarbon adsorption onto and desorption from the ***_(2)o_(3)coatings after long-time air exposure and ultra-high vacuum treatment both remained hydrophilic and showed a smaller hydrocarbon content than coatings after vacuum ***_(2)o_(3)coatings with hierarchical surface structures similar to the Yb_(2)o_(3)coatings showed an increase in WCA to only-170 after the same vacuum treatment,indicating the REO has a much higher affinity for hydrocarbon adsorption than Al_(2)o_(3),and that the content of hydrocarbon adsorbed on the surface of the REO determined the wetting behavior.

关键词： Rare earth oxide Hydrophobicity Solution precursor plasma spray Post-deposition treatments

Multiscale friction model for hot sheet metal forming

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Friction 2022年第2期10卷 316-334页

作者： Jenny VENEMA javad HAZRATI Eisso ATZEMA David MATTHEWS Ton van den BOOGAARD Tata Steel Research&DevelopmentCA Ijmuiden 1970the Netherlands Nonlinear Solid Mechanics Faculty of Engineering TechnologyUniversity of TwenteEnschede 7522 NBthe Netherlands Laboratory for Surface Technology and Tribology Faculty of Engineering TechnologyUniversity of TwenteEnschede 7522 NBthe Netherlands

The accurate description of friction is critical in the finite element(FE)simulation of the sheet metal forming ***,friction is oversimplified through the use of a constant Coulomb friction *** this study,the application of an existing multiscale friction model is extended to the hot stamping *** model accounts for the effects of tool and sheet metal surface topography as well as the evolution of contact pressure,temperature,and bulk strain during hot *** load flattening and strip drawing experiments are performed to calibrate the *** results show that the model can relatively well predict friction in strip draw experiments when the tool surface evolution due to wear is ***,the application of the formulated multiscale friction model was demonstrated in the FE simulation of a hot-stamped part.

关键词： tribology wear friction hot stamping friction model

Impacts of Depositional Facies and Diagenesis on Reservoir Quality:A Case Study from the Rudist-bearing Sarvak Formation,Abadan Plain,SW Iran

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Acta Geologica Sinica(English Edition) 2023年第1期97卷 190-206页

作者： Ali ASSADI javad HONARMAND Seyed Ali MOALLEMI Iraj ABDOLLAHIE-FARD Geology Division Tehran Energy Consultants(TEC)TehranIran School of Earth Sciences Damghan UniversityDamghanIran Department of Petroleum Geology Research Institute of Petroleum Industry(RIPI)TehranIran National Iranian Oil Company Exploration Directorate(NIOC)TehranIran

An integrated geological-petrophysical analysis of the rudist-bearing sequence of the Cretaceous Sarvak Formation is given one giant oilfield,and provides an improved understanding of this main reservoir in the Abadan Plain,in the Zagros Basin,SW *** main objective of this study is to evaluate reservoir potential of the Sarvak Formation,and then to utilize the calibrated well log signature to correlate reservoir potential in un-cored *** main facies are recognized and categorized in five facies groups:lagoon,shoal,rudist-biostrome,slope,and shallow open marine,deposited on a shelf carbonate *** the distribution of diagenetic products and their effects on pore systems,three diagenetic facies namely,(DF-1)low dissolution and cementation;(DF-2);high dissolution;and(DF-3)high cementation are *** initial sedimentary characteristics in combination with distribution of diagenetic products play an important role in reservoir quality *** effect of diagenetic processes related to disconformities mainly depends on the facies nature below these ***-dominated facies of shoal and rudist debris,observed below the Cenomanian–Turonian disconformity,are mostly characterized by high dissolution and interconnected pore ***,depositional and diagenetic facies in the studied wells are correlated by petrophysical well log data,leading to distribution of the reservoir *** obtained can be utilized for efficient reservoir characterization of the Sarvak Formation and its equivalent units in the Arabian Plate.

关键词： upstream petroleum facies diagenesis disconformity reservoir quality rudists Sarvak Formation Zagros Basin

Kinetic modeling of copper bioleaching from low-grade ore from the Shahrbabak Copper Complex

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International Journal of Minerals,Metallurgy and Materials 2017年第6期24卷 611-620页

作者： Saman Beikzadeh Noei Saeed Sheibani Fereshteh Rashchi Seyed Mohammad javad Mirazimi School of Metallurgy and Materials Engineering College of Engineering University of Tehran Tehran 13145-1318 Iran

The copper recovery from low-grade copper sulfide ore was investigated using microbial leaching. Several parameters substantially affect the bioleaching of copper; among them, pulp density and nutrient media were selected for investigation. The optimum conditions for copper recovery were a pulp density of 5 g/mL, a mixed-mineral salt medium of Acidithiobacillus thiooxidans(70vol%) and Acidithiobacillus ferrooxidans(30vol%), and 10vol% of inoculum. Under these conditions, the maximum bioleaching capacity of the medium for copper recovery was determined to be approximately 99%. The effect of pulp density on the kinetics of the bioleaching process was surveyed using both da Silva's method and constrained multilinear regression analysis. The kinetics of copper dissolution followed the shrinking core model, and the process was diffusion controlled at a pulp density of 5 g/mL. Nevertheless, at higher pulp densities, the process was controlled by chemical reaction.

关键词： bioleaching kinetics modeling copper mesophilic bacteria

Disturbance rejection and performance enhancement of perturbed tri-stable energy harvesters by adaptive finite-time disturbance observer

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Acta Mechanica Sinica 2022年第8期38卷 132-148页

作者： Shitong Fang Naser Padar Mohammad javad Mirzaei Shengxi Zhou Wei-Hsin Liao Department of Mechanical and Automation Engineering The Chinese University of Hong KongHong Kong999077China Department of Electrical Engineering Amirkabir University of TechnologyTehran15875-4413Iran Faculty of Electrical and Computer Engineering University of TabrizTabriz516661-6471Iran Research&Development Institute in Shenzhen Northwestern Polytechnical UniversityShenzhen518057China

Tristable energy harvesters(TEHs)have been proposed to achieve broad frequency bandwidth and superior low-frequency energy harvesting ***,due to the coexistence of three potential wells and the sensitivity to system conditions and external disturbances,the desired high-amplitude inter-well oscillation in the TEHs may be replaced by the chaotic or intra-well oscillations with inferior energy ***,the chaos has an unpredictable trajectory and may cause system damages,lessen the structural durability as well as require a more complicated circuit for power ***,in this paper,we firstly propose an adaptive finite-time disturbance observer(AFTDO)for performance enhancement of TEHs by detecting the external disturbances that induce the chaos,and reject them for the recovery of the desired inter-well *** proposed AFTDO eliminates the need to know in advance the upper bounds of imposed perturbations in conventional observers by means of the proposed adaptive protocols,leading to the higher efficacy of *** mathematical model of the piezoelectric TEH system and the AFTDO is *** demonstrate the effectiveness of the AFTDO,a series of numerical simulations have been *** show that for both cases with sinusoidal and impulsive disturbances,the AFTDO can successfully track the trajectories of the disturbance signals with the adaptive gain,and reject the disturbance to enable the TEH to sustain the periodic inter-well oscillation with effective energy harvesting performance.

关键词： Tristable energy harvesters Finite-time disturbance observer Sinusoidal and impulsive disturbances Chaos Inter-well oscillation