scholarly journals Effect of Mechanical Stresses on Coercive Force and Saturation Remanence of Ensemble of Dual-Phase Interacting Nanoparticles

2012 ◽  
Vol 557-559 ◽  
pp. 501-504
Author(s):  
Leonid Afremov ◽  
Yury Kirienko
Keyword(s):  
Theoretical Analysis ◽  
Coercive Force ◽  
Mechanical Stresses ◽  
Phase Model ◽  
Phase System ◽  
Dual Phase ◽  
Interacting Particles ◽  
Magnetostatic Interaction ◽  
Saturation Remanence

In the dual-phase model of interacting nanoparticles stretching leads to a decrease in both coercive force Hc and saturation remanence Irs , and compression — to their growth. Magnetostatic interaction between particles also decreases both Hc and Irs . Theoretical analysis was carried out in the framework of the dual-phase system of interacting particles on the example of nanoparticles γ-Fe2 O3, epitaxially coated with cobalt.

The Effect of Mechanical Stresses on the Coercive Force of the System of Two-Phase Interacting Nanoparticles

2014 ◽  
Vol 215 ◽  
pp. 89-94
Author(s):  
Leonid L. Afremov ◽  
Ilia G. Iliushin
Keyword(s):  
Theoretical Analysis ◽  
Coercive Force ◽  
Mechanical Stresses ◽  
Interacting Particles ◽  
Residual Saturation ◽  
Magnetostatic Interaction ◽  
Two Phase ◽  
Coated Particles ◽  
Grain Model ◽  
Hysteresis Characteristics

Within the framework of the two-phase grain model (by the example of γ-Fe203 cobalt coated particles) a theoretical analysis of the effect of uniaxial mechanical stresses on the magnetization of the system of hetero-phase interacting nanoparticle was held. It is shown that stretching leads to reduction when compression increases the coercive force Hc and doesnt change the residual saturation magnetization Irs of the system of interacting particles. "Smoothing" the hysteresis loop and "lowering" the magnetization curve, the magnetostatic interaction between particles decreases both Hc, and Irs, giving the fact that hysteresis characteristics of an ensemble of interacting nanoparticles change much more in stretching than in compression.

scholarly journals Effect of Mechanical Stresses on the Coercive Force of the Heterophase Non-Interacting Nanoparticles

2012 ◽  
Vol 472-475 ◽  
pp. 2199-2202 ◽  
Author(s):  
Leonid Afremov ◽  
Yury Kirienko
Keyword(s):  
Theoretical Analysis ◽  
Coercive Force ◽  
Saturation Magnetization ◽  
Exchange Interaction ◽  
Cobalt Ferrite ◽  
Uniaxial Stress ◽  
Mechanical Stresses ◽  
Residual Saturation

The theoretical analysis of the effect of uniaxial stress on the magnetization of the system of noninteracting nanoparticles is done by an example of heterophase particles of maghemite, epitaxially coated with cobalt ferrite. It is shown that stretching leads to a decrease in the coercive force Hc, and compression leads to its growth. The residual saturation magnetization Irs of nanoparticles does not change. With increasing of interfacial exchange interaction, coercive force varies nonmonotonically.

scholarly journals A Two-Phase Model of Air Shock Wave Induced by Rock-Fall in Closed Goaf

2017 ◽  
Author(s):  
Fengyu Ren ◽  
Yang Liu ◽  
Jianli Cao ◽  
Rongxing He ◽  
Yuan Xu ◽  
...  
Keyword(s):  
Shock Wave ◽  
Theoretical Analysis ◽  
Phase Model ◽  
Rock Fall ◽  
Uniform Motion ◽  
Two Phase ◽  
Protective Measures ◽  
Computational Fluid Dynamics Cfd ◽  
Series Of Experiments ◽  
Wave Induced

In this paper, a two-phase model of air shock wave induced by rock-fall was described. The model was made up of the uniform motion phase (velocity was close to 0 m·s-1) and the acceleration movement phase. The uniform motion phase was determined by experience, meanwhile the acceleration movement phase was derived by the theoretical analysis. A series of experiments were performed to verify the two-phase model and obtained the law of the uniform motion phase. The acceleration movement phase was taking a larger portion when height of rock-fall was higher with the observations. Experimental results of different falling heights showed good agreements with theoretical analysis values. Computational fluid dynamics (CFD) numerical simulation had been carried out to study the variation velocity with different falling height. As a result of this, the two-phase model could accurately and convenient estimating the velocity of air shock wave induced by rock-fall. The two-phase model could provide a reference and basis for estimating the air shock waves' velocity and designing the protective measures.

Analysis of Remagnetization Processes of High-Anisotropic Alloy after Heat Treatment

2021 ◽  
Vol 410 ◽  
pp. 56-61
Author(s):  
Alexey S. Lileev
Keyword(s):  
Heat Treatment ◽  
Coercive Force ◽  
Structure Formation ◽  
Domain Structure ◽  
Phenomenological Approach ◽  
Thermal Treatments ◽  
Type Alloy ◽  
Magnetostatic Interaction ◽  
Increasing Process

The simulation of the Sm(Co, Fe, Cu, Zr)7.5 type alloy domain structure formation after various thermal treatments was carried out by FMRM program based on a phenomenological approach to the analysis of the uniaxial highly anisotropic ferromagnets demagnetization processes. It is shown that the domain structure of the alloy in the thermally demagnetized state expands as the coercive force of the alloy decreases. It is noted that the domains size increasing process is associated not only with a decrease in the coercive force but also with a change in the influence of the magnetostatic interaction.

Histopathology of the airway epithelium in an experimental dual-phase model of bronchial asthma

2001 ◽  
Vol 31 (1) ◽  
pp. 135-143 ◽  
Author(s):  
Y. Tohda ◽  
H. Kubo ◽  
M. Ito ◽  
M. Fukuoka ◽  
S. Nakajima
Keyword(s):  
Bronchial Asthma ◽  
Airway Epithelium ◽  
Phase Model ◽  
Dual Phase

Further discussion on attenuation and dispersion of electromagnetic wave propagation in fluid‐saturated porous rocks and applications to dielectric‐constant well logging

Geophysics ◽  
1983 ◽  
Vol 48 (10) ◽  
pp. 1373-1380 ◽  
Author(s):  
H. Pascal
Keyword(s):  
Dielectric Constant ◽  
Wave Propagation ◽  
Electromagnetic Wave ◽  
Electromagnetic Wave Propagation ◽  
Phase Model ◽  
Phase System ◽  
Porous Rocks ◽  
Two Phase ◽  
Advantages And Disadvantages ◽  
Attenuation And Dispersion

This paper presents a more detailed analysis of some basic problems of electromagnetic wave propagation through a porous medium saturated with fluid, associated directly with quantitative interpretation of dielectric constant logging. The advantages and disadvantages of a new approach, in which fluid‐saturated porous rock is considered as a two‐phase system, are discussed and compared with those obtained from the single‐phase model. It is shown that the two‐phase model may provide a better interpretation of dielectric constant logging.

Effect of Orientation Relationships on the Stiffness and the Strength of the Dual-Phase Metals: Molecular Dynamics Simulation

2012 ◽  
Vol 479-481 ◽  
pp. 601-604
Author(s):  
Yan Zhang ◽  
Yan Zhao ◽  
Fu Cheng Zhang
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Phase Boundary ◽  
Phase Model ◽  
Dynamics Simulation ◽  
Dual Phase ◽  
Orientation Relationships ◽  
Phase Boundaries ◽  
Iron Phase ◽  
Important Kind

Phase boundary is an important kind of interfaces for the dual-phase metals. Orientation relationship (OR) is a crucial factor affecting the performance of the phase boundaries and the dual-phase metals. Molecular dynamics simulation is performed to examine the structures of the bcc/fcc iron phase boundaries in Nishiyama–Wassermann (N–W) and Kurdjumov–Sachs (K–S) orientation relationships, and the performances of the dual-phase model with these ORs. The structural relaxation shows that the phase boundary with N-W relation has the lower energy than that in K-S relation. Stress-strain curves show that dual-phase model in N-W relation has the higher stiffness and strength than that in K-S relation. Simulation results show that phase boundary in N-W relation has a more exellent performance, and is preferred to be processed in heat treatment.

scholarly journals Магнитные состояния двухфазных синтезированных частиц Fe-=SUB=-m-=/SUB=-O-=SUB=-n-=/SUB=--Fe-=SUB=-3-x-=/SUB=-Ti-=SUB=-x-=/SUB=-O-=SUB=-4-=/SUB=-: экспериментальный и теоретический анализ

2020 ◽  
Vol 62 (9) ◽  
pp. 1527
Author(s):  
П.В. Харитонский ◽  
А.А. Костеров ◽  
А.К. Гурылёв ◽  
К.Г. Гареев ◽  
С.А. Кириллова ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Theoretical Analysis ◽  
Hydrothermal Treatment ◽  
Remanent Magnetization ◽  
Sol Gel ◽  
Magnetostatic Interaction ◽  
Two Phase ◽  
Gel Method ◽  
Synthesis Conditions ◽  
Temperature Dependences

In this work, the materials of FemOn – Fe3-xTixO4 composition have been obtained using the sol-gel method and hydrothermal treatment. The synthesis conditions favor the formation of composites containing titanomagnetite in a rather low concentration. Based on the hysteresis curves and temperature dependences of the remanent magnetization, theoretical analysis of the composites magnetic properties has been carried out using a model of clustered two-phase particles bound with magnetostatic interaction.

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