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Structural and Magnetic Properties of Nanocomposite Nd–Fe–B Prepared by Rapid Thermal Processing Review

Jinbo Yang, Jingzhi Han, Haidong Tian, Liang Zha, Xiongzuo Zhang, Chol Song Kim, Dong Liang, Wenyun Yang, Shunquan Liu, Changsheng Wang

Engineering 2020, Volume 6, Issue 2,   Pages 131-139 doi: 10.1016/j.eng.2019.12.008

Abstract:

Nanoscale permanent magnetic materials, which possess excellent magnetic and mechanical properties, thermal stability, and corrosion resistance, have become a research hotspot for permanent magnets. In reality, however, the obtained maximum energy product, (BH)max, is not satisfactory in comparison with the theory limit, especially for exchange-coupled nanocomposite magnets. The construction of an ideal microstructure still remains a challenge in the synthesis and preparation of nanoscale permanent magnets. This work reported the impact of rapid thermal process (RTP) with electron-beam heating on the microstructures of Nd12.5-xFe80.8+xB6.2Nb0.2Ga0.3 (x = 0, 2.5) nanocomposites. It was found that the crystallization time was greatly reduced, from 15 min under the conventional annealing conditions to 0.1 s under the RTP. For Nd2Fe14B single-phase materials, the crystallization temperature of the RTP ribbons decreased by about 248 °C compared with that of the ribbons produced by the conventional annealing method. A synergetic crystallization of the Nd2Fe14B and α-Fe phases was observed under the RTP, which restrained not only the shape, size distribution, and compositions of the hard and the soft phases, but also the interface between them. This modification effect became more obvious as the fraction of Fe increased. Due to the improvement in the uniformity of the Nd2Fe14B and α-Fe phases, and their grain size distribution, better magnetic properties were achieved using RTP in comparison with the conventional annealing method.

Keywords： Nanocomposites     Electron-beam heating     Landau model and Langevin dynamics simulation     Synergetic crystallization    

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Model reduction of contact dynamics simulation using a modified Lyapunov balancing method

Jianxun LIANG, Ou MA, Caishan LIU

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 4,   Pages 383-391 doi: 10.1007/s11465-011-0244-9

Abstract: However, such a simulation remains very inefficient because very small integration time step must beAlthough many model reduction techniques have been available to improve the efficiency of finite elementthe high nonlinearity of the contact dynamics models.This paper presents a model reduction approach for finite-element based multibody contact dynamics simulationAn example is presented to demonstrate that, by applying the model reduction the simulation process is

Keywords： contact dynamics     dynamic simulation     model reduction     finite element method    

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Numerical simulation of fluid dynamics in the stirred tank by the SSG Reynolds Stress Model

Nana QI, Hui WANG, Kai ZHANG, Hu ZHANG

Frontiers of Chemical Science and Engineering 2010, Volume 4, Issue 4,   Pages 506-514 doi: 10.1007/s11705-010-0508-7

Abstract: The Speziale, Sarkar and Gatski Reynolds Stress Model (SSG RSM) is utilized to simulate the fluid dynamicsCFD model data in terms of the flow field, trailing vortex, and the power number are compared with publishedThe comparison shows that the global fluid dynamics throughout the stirred tank and the local characteristicsThe power number predicted is quite close to the designed value, which demonstrates that this model canTherefore, the simulation by using a combination of SSG RSM and MRF impeller rotational model can accurately

Keywords： stirred tank     fluid dynamics     numerical simulation     SSG Reynolds Stress Model     MRF    

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Molecular dynamics study of water diffusion in an amphiphilic block copolymer with large difference in

Yang Zhou, Phillip Choi

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 3,   Pages 440-447 doi: 10.1007/s11705-017-1626-2

Abstract: Isothermal-isobaric molecular dynamics simulation was used to study the diffusion mechanism of waterexponentially with increasing water concentration at both temperatures (i.e., following the free volume model

Keywords： molecular dynamics simulation     amphiphilic block copolymer     free volume     water diffusivity     fujita model    

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Computational fluid dynamics simulation of aerosol transport and deposition

Yingjie TANG, Bing GUO

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 3,   Pages 362-377 doi: 10.1007/s11783-011-0365-8

Abstract: In this article computational fluid dynamics (CFD) simulation of aerosol transport and deposition, i.ethe basics of aerosol mechanics, followed by a description of the general CFD approach for flow field simulation, turbulence modeling, wall treatments and simulation of particle motion and deposition.Then examples from the literature are presented, including CFD simulation of particle deposition in humanCFD simulation of particle transport and deposition may provide information that is difficult to obtain

Keywords： computational fluid dynamics (CFD)     aerosol     transport     deposition    

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A two-dimensional numerical model for eutrophication in Baiyangdian Lake

Xudong WANG, Shushen ZHANG, Suling LIU, Jingwen CHEN

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 6,   Pages 815-824 doi: 10.1007/s11783-011-0383-6

Abstract: An eutrophication eco-dynamics model including the effects of reed resistance on flow was coupled withAn improvement on the Water Quality Analysis Simulation Program (WASP, a modeling system introduced byThe model simulates water quality constituents associated with eutrophication in the lake, includingThe values calculated by the calibrated model agree well with field data, including ammonia nitrogen,Deviations between model-simulated and observed values are discussed.

Keywords： eutrophication     eco-dynamics     hydrodynamics     improved Water Quality Analysis Simulation Program (WASP) model    

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Molecular dynamics simulation on DNA translocating through MoS

Daohui Zhao, Huang Chen, Yuqing Wang, Bei Li, Chongxiong Duan, Zhixian Li, Libo Li

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 4,   Pages 922-934 doi: 10.1007/s11705-020-2004-z

Abstract: Herein, molecular dynamics simulations were performed to design a conceptual device to sequence DNA with

Keywords： DNA sequencing     MoS2     molecular dynamics simulation     nanopore     ionic current    

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Molecular dynamics simulation of diffusivity

LIU Juanfang, ZENG Danling, LI Qin, GAO Hong

Frontiers in Energy 2008, Volume 2, Issue 3,   Pages 359-362 doi: 10.1007/s11708-008-0039-9

Abstract: Equilibrium molecular dynamics simulation was performed on water to calculate its diffusivity by adopting

Keywords： diffusivity     Equilibrium molecular     influence     potential    

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Simulation of bubble column reactors using CFD coupled with a population balance model

Tiefeng WANG

Frontiers of Chemical Science and Engineering 2011, Volume 5, Issue 2,   Pages 162-172 doi: 10.1007/s11705-009-0267-5

Abstract: tools for engineering purposes, much research has been carried out in the area of computational fluid dynamics(CFD) modeling and simulation of gas-liquid flows.The population balance model (PBM) is an effective approach to predict the bubble size distribution,This article gives a selective review of the modeling and simulation of bubble column reactors usingIt is shown that the CFD-PBM coupled model with proper bubble breakup and coalescence models and interphase

Keywords： bubble column     computational fluid dynamics     bubble breakup and coalescence     population balance model     bubble    

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Applying system dynamics to strategic decision making in construction

SangHyun LEE

Frontiers of Engineering Management 2017, Volume 4, Issue 1,   Pages 35-40 doi: 10.15302/J-FEM-2017002

Abstract: The author discusses the application of System Dynamics to high-level strategic simulation in constructionIn particular, System Dynamics’ strength on representing feedback processes, aggregation, soft variables, and continuous simulation clock for high-level simulation are discussed using real modeling examplesFrom this exercise, it is concluded that System Dynamics offers a great potential for strategic simulationFurther, the author proposes a comprehensive simulation framework that integrates System Dynamics and

Keywords： strategic project management     construction management     system dynamics     feedback process     hybrid simulation    

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understanding of interfacial processing mechanism of silicon in water environment: A ReaxFF molecular dynamicssimulation

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 3,   Pages 570-579 doi: 10.1007/s11465-021-0642-6

Abstract: Simulation results show that the substrate is highly passivated under high humidity, and the passivation

Keywords： silicon     ReaxFF     molecular dynamics     friction     damage    

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Many-body dissipative particle dynamics simulation of wetting phenomena

Ying ZHAO, Ye YUE, Xianren ZHANG, Shuangyang LI, Atul SAJJANHAR,

Frontiers of Chemical Science and Engineering 2010, Volume 4, Issue 3,   Pages 280-282 doi: 10.1007/s11705-009-0278-2

Abstract: With the development of the simulation of particle dynamics, the traditional dissipative particle dynamics

Keywords： development     satisfactory     traditional dissipative     phenomena     solid-liquid interface    

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Numerical simulation of micro scale flowing and boiling

Wen WANG, Rui ZHUAN,

Frontiers in Energy 2009, Volume 3, Issue 4,   Pages 396-401 doi: 10.1007/s11708-009-0049-2

Abstract: simulations of flowing and boiling in micro channels are presented, including the modeling of bubble dynamics

Keywords： volume-of-fluid (VOF)     micro channel     nucleate boiling     bubble dynamics     simulation    

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CFD simulation on membrane distillation of NaCl solution

Zhaoguang XU, Yanqiu PAN, Yalan YU

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 3,   Pages 293-297 doi: 10.1007/s11705-009-0204-7

Abstract: A computational fluid dynamics (CFD) simulation that coupled an established heat and mass transfer model

Keywords： membrane distillation     computational fluid dynamics (CFD) simulation     temperature polarization     carbon membrane    

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Simulation of abrasive flow machining process for 2D and 3D mixture models

Rupalika DASH,Kalipada MAITY

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 4,   Pages 424-432 doi: 10.1007/s11465-015-0366-6

Abstract: Computational fluid dynamics (CFD) simulation was employed to accurately determine optimum parametersIn the current work, a 2D model was designed, and the flow analysis, force calculation, and materialAnother 3D model for a swaging die finishing using AFM was simulated at different viscosities of theA CFD simulation was performed by using commercially available ANSYS FLUENT.Two phases were considered for the flow analysis, and multiphase mixture model was taken into account

Keywords： abrasive flow machining (AFM)     computational fluid dynamics (CFD) modeling     mixture model    

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Title Author Date Type Operation

Structural and Magnetic Properties of Nanocomposite Nd–Fe–B Prepared by Rapid Thermal Processing

Jinbo Yang, Jingzhi Han, Haidong Tian, Liang Zha, Xiongzuo Zhang, Chol Song Kim, Dong Liang, Wenyun Yang, Shunquan Liu, Changsheng Wang

Journal Article

Model reduction of contact dynamics simulation using a modified Lyapunov balancing method

Jianxun LIANG, Ou MA, Caishan LIU

Journal Article

Numerical simulation of fluid dynamics in the stirred tank by the SSG Reynolds Stress Model

Nana QI, Hui WANG, Kai ZHANG, Hu ZHANG

Journal Article

Molecular dynamics study of water diffusion in an amphiphilic block copolymer with large difference in

Yang Zhou, Phillip Choi

Journal Article

Computational fluid dynamics simulation of aerosol transport and deposition

Yingjie TANG, Bing GUO

Journal Article

A two-dimensional numerical model for eutrophication in Baiyangdian Lake

Xudong WANG, Shushen ZHANG, Suling LIU, Jingwen CHEN

Journal Article

Molecular dynamics simulation on DNA translocating through MoS

Daohui Zhao, Huang Chen, Yuqing Wang, Bei Li, Chongxiong Duan, Zhixian Li, Libo Li

Journal Article

Molecular dynamics simulation of diffusivity

LIU Juanfang, ZENG Danling, LI Qin, GAO Hong

Journal Article

Simulation of bubble column reactors using CFD coupled with a population balance model

Tiefeng WANG

Journal Article

Applying system dynamics to strategic decision making in construction

SangHyun LEE

Journal Article

understanding of interfacial processing mechanism of silicon in water environment: A ReaxFF molecular dynamicssimulation

Journal Article

Many-body dissipative particle dynamics simulation of wetting phenomena

Ying ZHAO, Ye YUE, Xianren ZHANG, Shuangyang LI, Atul SAJJANHAR,

Journal Article

Numerical simulation of micro scale flowing and boiling

Wen WANG, Rui ZHUAN,

Journal Article

CFD simulation on membrane distillation of NaCl solution

Zhaoguang XU, Yanqiu PAN, Yalan YU

Journal Article

Simulation of abrasive flow machining process for 2D and 3D mixture models

Rupalika DASH,Kalipada MAITY

Journal Article