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A Stable Numerical Scheme Based on the Hybridized Discontinuous Galerkin Method for the Ito-Type Coupled KdV System

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Communications on Applied Mathematics and Computation 2022年第4期4卷 1351-1373页

作者： Shima Baharlouei reza mokhtari Nabi Chegini Department of Mathematical Sciences Isfahan University of Technology84156-83111 IsfahanIran Department of Mathematics Tafresh University39518-79611 TafreshIran

The purpose of this paper is to develop a hybridized discontinuous Galerkin(HDG)method for solving the Ito-type coupled KdV *** fact,we use the HDG method for discre-tizing the space variable and the backward Euler explicit method for the time *** linearize the system,the time-lagging approach is also *** numerical stability of the method in the sense of the L2 norm is proved using the energy method under certain assumptions on the stabilization parameters for periodic or homogeneous Dirichlet bound-ary *** experiments confirm that the HDG method is capable of solving the system *** is observed that the best possible rate of convergence is achieved by the HDG ***,it is being illustrated numerically that the corresponding con-servation laws are satisfied for the approximate solutions of the Ito-type coupled KdV *** to the numerical experiments,it is verified that the HDG method could be more efficient than the LDG method for solving some Ito-type coupled KdV systems by comparing the corresponding computational costs and orders of convergence.

关键词： Hybridized discontinuous Galerkin(HDG)method Stability analysis Ito-type coupled KdV system Conservation laws

A Local Discontinuous Galerkin Method for Two-Dimensional Time Fractional Diffusion Equations

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Communications on Applied Mathematics and Computation 2020年第4期2卷 689-709页

作者： Somayeh Yeganeh reza mokhtari Jan SHesthaven Department of Mathematical Sciences Isfahan University of TechnologyIsfahan 84156-83111Iran EPFL-SB-MATHICES-MCSS École Polytechnique Fédéral de Lausanne1015 LausanneSwitzerland

For two-dimensional(2D)time fractional diffusion equations,we construct a numerical method based on a local discontinuous Galerkin(LDG)method in space and a finite differ-ence scheme in *** investigate the numerical stability and convergence of the method for both rectangular and triangular meshes and show that the method is unconditionally *** results indicate the effectiveness and accuracy of the method and con-firm the analysis.

关键词： Two-dimensional(2D)time fractional difusion equation Local discontinuous Galerkin method(LDG) Numerical stability Convergence analysis

Perspective on dietary isothiocyanates in the prevention,development and treatment of cancer

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Journal of Cancer Metastasis and Treatment 2020年第1期6卷 271-286页

作者： Herman Yeger reza Bayat mokhtari The Hospital for Sick Children Program in Developmental and Stem Cell BiologyTorontoON M5G 0A4Canada Department Biomedical&Molecular Sciences Botterell Hall Rm 827Queen’s UniversityKingstonON K7L 3N6Canada

Epidemiological evidence has highlighted the association of specific diets and a lower incidence of ***,the Mediterranean diet provides high levels of polyphenolics and a high consumption of healthier fats,e.g.,as from olive *** the Mediterranean region the consumption of vegetables is elevated providing a class of compounds,the isothiocyanates(ITCs)as found in the cabbage *** ITCs have raised great interest for their health benefits over the past few *** of the key ITC compounds,sulforaphane,phenethylisothiocyanate and benzyl isothiocyanate,have been studied in vitro and in vivo and the data support their promise for cancer chemoprevention,as anti-tumor agents,and for chemoprotection of normal tissues and *** with other polyphenolic compounds in the diet,in general,they also possess key anti-inflammatory properties thus satisfying the criteria for compounds that could intervene in cancer initiation and *** this review we provide a larger overview of the advantages of including ITCs in the diet as food or as supplements and speculate on what could constitute a valuable therapeutic strategy for improving and sustaining good health and countering cancer disease in humans.

关键词： Mediterranean diet isothiocyanates chemoprevention chemoprotection anti-tumor hormesis mitohormesis anti-inflammatory

The effect of green tea mouthwash (<i>Camellia sinensis</i>) on wound healing following periodontal crown lengthening surgery;a double blind randomized controlled trial

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Open Journal of Stomatology 2012年第4期2卷 369-372页

作者： Ali Forouzanfar Hamid reza Arab Hooman Shafaee Majid reza mokhtari Shayan Golestani Department of Orthodontics Mashhad University of Medical Sciences Mashhad Iran Oral and Maxillofacial Diseases Research Center School of Dentistry Mashhad University of Medical Sciences Mashhad Iran

Green tea has been used as a traditional medicine since 2700 BC and several studies have shown that green tea polyphenols inhibit the growth of oral and periodontal pathogenic bacteria and can improve oral and gingival health. In this clinical study we investigated the effect of green tea mouthwash on microbial dental plaque and gingival inflammation following periodontal surgery. A total of 34 crown lengthening surgeries were included in this study. After removing periodontal dressing, green tea mouthwash for the test group and placebo for the patients in the control group were prescribed, and periodontal parameters were assessed at base line and after 2 weeks. Analysis of the data revealed the significant effect of green tea mouthwash on reducing Plaque index (PI), Gingival Index (GI) and Bleeding on probing (BOP). Therefore it would be recommended as a safe, anti-inflammatory and anti-microbial mouthwash for treating gingival inflammation and maintaining oral and gingival health.

关键词： Green Tea Antibacterial Dental Plaque Periodontal Surgery

Nonlinear phenomena in vibrations of embedded carbon nanotubes conveying viscous fluid

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Nanotechnology and Precision Engineering 2024年第1期7卷 44-54页

作者： reza Ebrahimi Mechanical Engineering Faculty of EngineeringYasouj UniversityYasouj 75918-74831Iran

Various nonlinear phenomena such as bifurcations and chaos in the responses of carbon nanotubes(CNTs)are recognized as being major contributors to the inaccuracy and instability of nanoscale mechanical ***,the main purpose of this paper is to predict the nonlinear dynamic behavior of a CNT conveying viscousﬂuid and supported on a nonlinear elastic *** proposed model is based on nonlocal Euler–Bernoulli beam *** Galerkin method and perturbation analysis are used to discretize the partial differential equation of motion and obtain the frequency-response equation,respectively.A detailed parametric study is reported into how the nonlocal parameter,foundation coefﬁcients,ﬂuid viscosity,and amplitude and frequency of the external force inﬂuence the nonlinear dynamics of the ***,quasi-periodic,and chaotic behaviors and hardening nonlinearity are revealed by means of the vibration time histories,frequency-response curves,bifurcation diagrams,phase portraits,power spectra,and Poincaré***,the results show that it is possible to eliminate irregular motion in the whole range of external force amplitude by selecting appropriate parameters.

关键词： Nonlinear vibration Carbon nanotubes Nonlocal effect Viscousﬂuid Nonlinear elastic medium

Modified Widman flap procedure: With or without periodontal dressing?

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Open Journal of Stomatology 2012年第3期2卷 170-172页

作者： Habib Ghanbari Ali Forouzanfar Kazem Fatemi Majid reza mokhtari Maryam Abrishami Zahra Ebrahiminik Fateme Farazi Department of Periodontics School of Dentistry Mashad University of Medical Sciences Mashad Iran

Aim: The purpose of this study was to evaluate the postoperative pain experience and gingival indexes with and without the use of periodontal dressing after Modified Widman flap procedure. Materials and Methods: Twenty patients requiring comparable bilateral flap procedures were selected. One quadrant of each jaw randomly received periodontal dressing after the surgery while the other one didn’t. Plaque Index (PI), Sulcus Bleeding Index (SBI) and Probing Depth (PD) were measured prior to the surgery, one week and 2 weeks after the surgery. Postoperative pain experience also was assessed at the conclusion of study. Results: Results showed no significant differences between dressed and undressed segments regarding changes in probing depth, plaque index or sulcus bleeding index. However patients reported significantly less pain postoperatively when the dressing was used Conclusion: Pain is reduced by periodontal dressing but No significant differences between dressed and undressed segments regarding changes in probing depth, plaque index or sulcus bleeding index.

关键词： Periodontal Dressing Periodontal Surgery Pain

Temperature-jump tensile tests to induce optimized TRIP/TWIP effect in a metastable austenitic stainless steel

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International Journal of Minerals,Metallurgy and Materials 2024年第9期31卷 2025-2036页

作者： Mohammad Javad Sohrabi Hamed Mirzadeh Saeed Sadeghpour Abdol reza Geranmayeh reza Mahmudi School of Metallurgy and Materials Engineering College of EngineeringUniversity of Tehran14395-515TehranIran Centre for Advanced Steels Research Materials and Mechanical EngineeringUniversity of Oulu90014 OuluFinland

In the present work,plastic deformation mechanisms were initially tailored by adjusting the deformation temperature in the range of 0 to 200℃ in AISI 304L austenitic stainless steel,aiming to optimize the strength-ductility *** was shown that the combined twinning-induced plasticity(TWIP)/transformation-induced plasticity(TRIP)effects and a wider strain range for the TRIP effect up to higher strains by adjusting the deformation temperature are good strategies to improve the strength-ductility synergy of this metastable stainless *** this regard,by consideration of the observed temperature-dependency of plastic deformation,the controlled sequence of TWIP and TRIP effects for archiving superior strength-ductility trade-off was intended by the pre-designed temperature jump tensile ***,the optimum tensile toughness of 846 MJ/m^(3) and total elongation to 133% were obtained by this strategy via exploiting the advantages of the TWIP effect at 100℃ and the TRIP effect at 25℃ at the later stages of the ***,a deformation-temperature-transformation(DTT)diagram was developed for this metastable ***,based on work-hardening analysis,it was found that the main phenomenon constraining further improvement in the ductility and strengthening was the yielding of the deformation-induced α′-martensite.

关键词： metastable stainless steels transformation-induced plasticity twinning-induced plasticity stacking fault energy mechanical properties

Particle size distribution in a multi-zone circulating fluidized bed polymerization reactor

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Particuology 2024年第10期93卷 291-299页

作者： Mohammadhossein Hadadiyan Navid Mostoufi reza Marandi Process Design and Simulation Research Centre School of Chemical EngineeringCollege of EngineeringUniversity of TehranP.O.Box 11155-4563TehranIran Polymer Research Group Petrochemical Research and Technology CompanyNational Petrochemical CompanyP.O.Box 14358/84711TehranIran

This research focuses on modeling a multi-zone circulating reactor(MZCR)in the polypropylene production *** these reactors,designed for polyolefin production,small catalyst particles(20–300μm)initiate polymerization in the presence of monomer *** reactor consists of two main regions:the riser and the *** riser operates in the fast fluidization and the downer is in the moving bed *** the two-fluid model with the Eulerian-Eulerian approach,the dynamics of both solid and gas phases were modeled by applying Newton's laws of motion and assuming spherical *** population balance of particles within the reactor was also coupled with the equations of *** simultaneous solution of these equations provides valuable insights into particle and fluid behavior,revealing trends such as the growth of polymer ***,the impact of various operating conditions was *** study also examined the effects of design parameters(gas inlet velocity,average inlet diameter,and temperature)on the system *** instance,it was shown that in the case where the solid circulation flux is 30 kg/(m^(2) s)the velocity of particles in the bed increases from 0.4 at the inlet to 1.1 m/s in the fully developed zone,when it is 43 kg/(m^(2) s)the velocity of particles increases from 0.3 to 1.4 m/s,and when it is 55 kg/(m^(2) s),it is increased from 0.22 to 1.5 m/***,trends in particle size distribution based on temperature adjustments were *** study showed that higher temperatures accelerate the polymerization reaction rate,promoting faster growth kinetics and the formation of larger particles.

关键词： Fluidization Polymerization Gas-solid flow Multi-zone circulating reactor(MZCR) CFD-PBM Two-fluidmodel

Resilence Control of DC Microgrid Integrated with Multi-Nanogrids Considering Connected-Islanded States

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 786-796页

作者： Hossien Faraji reza Hemmati Pierluigi Siano Department of Electrical Engineering Amirkabir University of TechnologyTehranIran Department of Electrical Engineering Kermanshah University of TechnologyKermanshahIran Department of Management&Innovation Systems University of Salernoand also with the Department of Electrical and Electronic Engineering ScienceUniversity of JohannesburgJohannesburg 2006South Africa

In this paper, a DC microgrid (DCMG) integrated with a set of nano-grids (NG) is studied. DCMG exchanges predetermined active and reactive power with the upstream network. DCMG and NGs are coordinately controlled and managed in such a way the exchanged P-Q power with external grid are kept on scheduled level following all events and operating conditions. The proposed control system, in addition to the ability of mutual support between DCMG and NGs, makes NGs support each other in critical situations. On the other hand, in all operating conditions, DCMG not only feeds three-phase loads with time-varying active and reactive power on the grid side but also injects constant active power into the grid. During events, NGs support each other, NGs support DCMG, and DCMG supports NGs. Such control strategies are realized by the proposed control method to increase resilience of the system. For these purposes, all resources and loads in DCMG and NGs are equipped with individual controllers. Then, a central control unit analyzes, monitors, and regularizes performance of individual controllers in DCMG and NGs. Nonlinear simulations show the proposed model can effectively control DCMG and NGs under normal and critical conditions.

关键词： Control system DC microgrid nanogrid resilience