International Journal of Applied Electromagnetics and Mechanics - Volume 56, issue 1

Authors: Zhang, Shuai | Li, Wenlong | Zhang, Xueying | Wang, Hongbin | Zhao, Mingkang | Li, Zixiu | Xu, Jinzhao | Xu, Jiayue | Cui, Kun | Shi, Xun | Tan, Chunxiao | Xu, Guizhi

Article Type: Research Article

Abstract: Magnetoacoustic Tomography with Magnetic Induction (MAT-MI) is a hybrid imaging modality proposed to reconstruct the electrical impedance property in biological tissue with high spatial resolution. The tissue in most parts of human body has inhomogeneous acoustic properties, which will significantly affect the propagations of ultrasound waves. And then it leads to potential distortion and blurring of the acoustic source and conductivity images in the reconstruction. The purpose of this paper is to reconstruct both the acoustic source and conductivity distribution in an acoustically heterogeneous medium. And a new algorithm is presented based on the generalized finite element method (GFEM) and …inhomogeneous time reversal method. We established an acoustic inhomogeneous model, in which different regions of the model the acoustic signals spread with different speeds. The numerical simulation experiments showed feasibility of the new method. Then we applied the proposed algorithm to reconstruct the conductivity of a gel phantom with our MAT-MI system. The experimental results indicate that the acoustic inhomogeneity of tissues in terms of speed variation can be reconstructed in the process of MAT-MI imaging. Show more

Keywords: MAT-MI, acoustic inhomogeneity, time reversal method

DOI: 10.3233/JAE-9170095

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 56, no. 1, pp. 131-140, 2018

Authors: Chen, Dezhi | Fang, Liwei | Zhao, Wenliang | Bai, Baodong | Kwon, Byung-Il

Article Type: Research Article

Abstract: In this paper, a design scheme for a novel energy-saving contactor using two-phase magnetic material is presented. A magnetization model using two-phase magnetic material was built with mathematical modeling and the theory of the Preisach model. The conversion mechanism was analyzed in order to reveal the relationship between the remanence and coercivity. The manufacturing process of the material is also described. Based on the differences between the transformation characteristics of the two-phase magnetic material in the permanent magnet and the soft magnetic field, an energy-saving contactor was designed by using two-phase magnetic material based on the remnant magnetism of 75 …Oe. The simulation and experiment results show that the proposed energy-saving contactor functions well. Show more

Keywords: Two-phase magnetic material, hysteresis model, energy-saving contactor

DOI: 10.3233/JAE-9170096

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 56, no. 1, pp. 141-149, 2018