Influence of Material Parameters on the Stability of Artificial Skyrmion in Hard/Soft Magnetic Bilayer

2021 ◽  
Author(s):  
Yi Liu ◽  
Zheng-Hong Qian ◽  
Jian-Guo Zhu
Keyword(s):  
Soft Magnetic ◽  
Material Parameters ◽  
The Stability

Light-Induced Metastable Defects in a-Si:H: Towards an Understanding

1985 ◽  
Vol 49 ◽  
Author(s):  
Martin Stutzmann ◽  
Warren B. Jackson ◽  
Chuang Chuang Tsai
Keyword(s):  
Amorphous Silicon ◽  
Mechanical Stress ◽  
Hydrogenated Amorphous Silicon ◽  
Material Parameters ◽  
Kinetic Behaviour ◽  
Proposed Model ◽  
Special Cases ◽  
The Stability ◽  
Hydrogenated Amorphous

AbstractThe dependence of the creation and the annealing of metastable dangling bonds in hydrogenated amorphous silicon on various material parameters will be discussed in the context of a recently proposed model. After a brief review of the kinetic behaviour governing defect creation and annealing in undoped a- Si:H, a number of special cases will be analyzed: the influence of alloying with O, N, C, and Ge, changes introduced by doping and compensation, and the role of mechanical stress. Finally, possibilities to increase the stability of a-Si:H based devices will be examined.

Influences of the Adding Manners of b on the Stability and the Soft Magnetic Properties of Amorphous Fe52Co34Hf7B6Cu1 Alloys

2013 ◽  
Vol 320 ◽  
pp. 83-87 ◽  
Author(s):  
Yue Gu ◽  
Yue Sheng Chao
Keyword(s):  
Activation Energy ◽  
Magnetic Properties ◽  
Amorphous State ◽  
Soft Magnetic Property ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Transmission Electron ◽  
The Matrix ◽  
Quenching Method ◽  
The Stability

The stability and the soft magnetic properties of amorphous Fe52Co34Hf7B6Cu1 alloys have been investigated in this paper. Amorphous Fe52Co34Hf7B6Cu1 alloys ribbons are prepared by single-roller-quenching method. The differential thermal analysis (DTA), X-ray diffraction (XRD), Mössbauer Spectroscopy, transmission electron microscope (TEM) and vibrating sample magnetometer (VSM) were used for characterizing microstructures, soft magnetic properties, and evaluating the influence of adding manners of B on the stability of as-quenched specimens. The XRD curve shows a wide dispersion of peak, the TEM diffraction ring was dispersed cyclic, the pattern of the matrix was homogeneous, and the Mössbauer spectrum of as-quenched alloy presents a typical broadened and overlapped sextet, which confirms the as-quenched alloy in fully amorphous state. The DTA results showed the activation energy of Fe52Co34Hf7B6Cu1 alloy is 299.7KJ/mol. When pure B is replaced by FeB in preparing amorphous Fe52Co34Hf7B6Cu1 alloys, the activation energy reduced to 293.3 KJ/mol,and the soft magnetic property is decline according VSM results.

Stability Analysis for Pillars during the Process of Panel Mining Based on Dynamic Fuzzy Reliability

2011 ◽  
Vol 120 ◽  
pp. 263-268
Author(s):  
Shi Jiao Yang ◽  
Hui Luo ◽  
Jian Yong Dai ◽  
Chang Zhen Wu
Keyword(s):  
Strain State ◽  
Fuzzy Reliability ◽  
Pillar Stability ◽  
Performance Function ◽  
Material Parameters ◽  
Entire Process ◽  
Lead Zinc ◽  
Zinc Mine ◽  
Finite Element Numerical Simulation ◽  
The Stability

Panel mining requires constructing lots of artificial pillars in underground metal mines. Along with the development of the mining process the stress-strain state of pillars changes constantly. Finite element numerical simulation with Midas/GTS software is used to analyze the stability of the pillar during the entire process of panel mining and consider randomness and fuzziness for material parameters of concrete and ore rock to get stress distribution in the pillar. In this paper, the performance function and equation of dynamic fuzzy reliability for a pillar in the whole mining process are established and are solved by a program developed with the MATLAB software. Applying the proposed theory and procedures to dynamic fuzzy reliability analysis and calculation of the pillar was set in panel mining under complex conditions in Zhao Tong Lead-Zinc mine. The results indicate that dynamic fuzzy reliability can better reflect the pillar stability during the entire process of panel mining and the proposed theory and procedures are effective in evaluating the dynamic fuzzy reliability.

ON STATIC STABILITY OF NONLINEARLY ELASTIC EULER'S COLUMNS OBEYING THE MODIFIED LUDWICK'S LAW

2012 ◽  
Vol 12 (06) ◽  
pp. 1250077 ◽  
Author(s):  
MIHA BROJAN ◽  
MATEJ SITAR ◽  
FRANC KOSEL
Keyword(s):  
Constitutive Model ◽  
Static Stability ◽  
Engineering Practice ◽  
Structural Systems ◽  
Structural Elements ◽  
Material Parameters ◽  
Bifurcation Buckling ◽  
Elastic Column ◽  
The Stability ◽  
Nonlinearly Elastic

It is illustrated in this paper that a nonlinearly elastic column, depending upon the values of different material parameters involved, exhibits several stability characteristics and types of buckling which are generally observed separately in distinctively different structural systems. By introducing finite disturbances it is shown that the column may buckle well before the bifurcation buckling load is reached. The proposed approach can be useful in engineering practice since it can be utilized to study the stability of uniaxial structural elements made from rubber or any other material which obeys the modified Ludwick's constitutive model.

The Experimental Analysis of Modifier on Fluid Magnetic Abrasivetool

2011 ◽  
Vol 189-193 ◽  
pp. 369-372
Author(s):  
Hong Zhang ◽  
Peng Peng
Keyword(s):  
Experimental Analysis ◽  
Magnetic Particles ◽  
Magnetorheological Fluid ◽  
Sodium Hexametaphosphate ◽  
Nano Silica ◽  
Soft Magnetic ◽  
Important Indicator ◽  
The Stability ◽  
Base Liquid

Fluid magnetic abrasivetool is a kind of suspension, which is composed of soft magnetic particles, surfactants, base liquid and so on so forth, so it can have strong magnetorheological characteristics and grinding characteristics. The stability of magnetorheological fluid is one of the most important indicator to evaluate the quality of magnetorheological fluid. Sodium hexametaphosphate and PAA have perfect function to maintain dispersionstability and retrogradation, adding nano-silica can improve the retrogradation of magnetic abrasivetool, which can modify redispersibility of magnetic abrasivetool.

Parameters Determination of Mooney-Rivlin Model for Rubber Material of Mechanical Elastic Wheel

2017 ◽  
Vol 872 ◽  
pp. 198-203 ◽  
Author(s):  
Xian Bin Du ◽  
You Qun Zhao ◽  
Fen Lin ◽  
Zhen Xiao
Keyword(s):  
Finite Element ◽  
Tensile Tests ◽  
Driving Safety ◽  
Uniaxial Tensile ◽  
Test Machine ◽  
Rubber Material ◽  
Material Parameters ◽  
Elastic Wheel ◽  
Mechanical Elastic Wheel ◽  
The Stability

In order to improve the driving safety of vehicles, a non-pneumatic safety tire named mechanical elastic wheel was developed, and the structural components of mechanical elastic wheel and the method of determining the rubber material parameters of Mooney-Rivlin model were introduced. Uniaxial tensile tests of the rubber in different parts of mechanical elastic wheel were carried out with a stretch test machine and the material parameters and of the Mooney-Rivlin model were determined by fitting the experimental data. Finite element method (FEM) was used to validate the stability of the fitted data. The results show that the obtained material parameters have high accuracy and can be a reference for the subsequent finite element simulation of mechanical elastic wheel.

scholarly journals Characterization of Giant Magnetostrictive Materials Using Three Complex Material Parameters by Particle Swarm Optimization

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1416
Author(s):  
Yukai Chen ◽  
Xin Yang ◽  
Mingzhi Yang ◽  
Yanfei Wei ◽  
Haobin Zheng
Keyword(s):  
Classical Method ◽  
Lumped Parameter Model ◽  
Complex Material ◽  
Material Parameters ◽  
Magnetostrictive Materials ◽  
Lumped Parameter ◽  
Giant Magnetostrictive Materials ◽  
Power Transducer ◽  
And Performance ◽  
The Stability

Complex material parameters that can represent the losses of giant magnetostrictive materials (GMMs) are the key parameters for high-power transducer design and performance analysis. Since the GMMs work under pre-stress conditions and their performance is highly sensitive to pre-stress, the complex parameters of a GMM are preferably characterized in a specific pre-stress condition. In this study, an optimized characterization method for GMMs is proposed using three complex material parameters. Firstly, a lumped parameter model is improved for a longitudinal transducer by incorporating three material losses. Then, the structural damping and contact damping are experimentally measured and applied to confine the parametric variance ranges. Using the improved lumped parameter model, the real parts of the three key material parameters are characterized by fitting the experimental impedance data while the imaginary parts are separately extracted by the phase data. The global sensitivity analysis that accounts for the interaction effects of the multiple parameter variances shows that the proposed method outperforms the classical method as the sensitivities of all the six key parameters to both impedance and phase fitness functions are all high, which implies that the extracted material complex parameters are credible. In addition, the stability and credibility of the proposed parameter characterization is further corroborated by the results of ten random characterizations.

scholarly journals EM modelling of arbitrary shaped dispersive chiral dielectric objects using a 3D leapfrog scheme on unstructured meshes

2020 ◽  
Author(s):  
A. Gansen ◽  
M. El Hachemi ◽  
S. Belouettar ◽  
O. Hassan ◽  
K. Morgan
Keyword(s):  
The Novel ◽  
Basic Scheme ◽  
Material Interfaces ◽  
Material Parameters ◽  
Yee Scheme ◽  
Leapfrog Scheme ◽  
The Stability ◽  
Dielectric Objects ◽  
Lossy Materials ◽  
Modelling Problems

Abstract The standard Yee FDTD algorithm is widely used in computational electromagnetics because of its simplicity and divergence free nature. A generalization of this classical scheme to 3D unstructured co-volume meshes is adopted, based on the use of a Delaunay primal mesh and its high quality Voronoi dual. This circumvents the problem of accuracy losses, which are normally associated with the use of a staircased representation of curved material interfaces in the standard Yee scheme. The procedure has been successfully employed for modelling problems involving both isotropic and anisotropic lossy materials. Here, we consider the novel extension of this approach to allow for the challenging modelling of chiral materials, where the material parameters are frequency dependent. To adequately model the dispersive behaviour, the Z-transform is employed, using second order Padé approximations to maintain the accuracy of the basic scheme. To validate the implementation, the numerical results produced are compared with available analytical solutions. The stability of the chiral algorithm is also studied.

STABILITY OF LARGE OPTICAL SINGLET BIPOLARONS, MANY-PARTICLE EFFECTS AND HIGH TEMPERATURE SUPERCONDUCTIVITY

1992 ◽  
Vol 06 (15) ◽  
pp. 959-966 ◽  
Author(s):  
ASHOK CHATTERJEE ◽  
SHREEKANTHA SIL
Keyword(s):  
Thin Films ◽  
High Temperature ◽  
Normal State ◽  
Entire Range ◽  
High Temperature Superconductivity ◽  
Three Dimensions ◽  
Stability Criteria ◽  
Material Parameters ◽  
Coupling Parameters ◽  
The Stability

The stability criteria for large optical bipolarons are obtained variationally for the entire range of the coupling parameters in both two and three dimensions. The size and the effective mass of these bipolarons are calculated and their variations with the material parameters are discussed. Two compounds are suggested which in the form of thin films should be tested for large bipolaronic effects. The theory is finally applied to La 2 CuO 4 and some of its normal state and superconductive properties are explained using the large bipolaronic mechanism.

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