ALBERT

Description: Behavior of different planar multilayer periodic structures due to plane wave excitation has been studied using the transfer matrix method. Multilayer structure is composed of odd number of slabs and the layers at odd locations have same characteristics and layers at even locations have same characteristics. For each structure, layers at odd locations are of chiral nihility metamaterial whereas three different cases are considered for layers at even locations, i.e., dielectric, chiral and chiral nihility. Effects of polarization rotation due to the optical activity of material's chirality is studied with respect angle of incidence and frequency in THz region. Chiral nihility adds property of transparency to the structure for normal incidence. Chiral nihility-chiral nihility structure for normal incidence yields transparency whereas same structure for oblique incidence yields total rejection at higher frequencies. Content Type Journal Article Pages - DOI 10.3233/JAE-131724 Authors Nayyar Abbas Shah, Department of Electronics, Quaid-i-Azam University, Islamabad, Pakistan Faiz Ahmad, Department of Physics, COMSATS Institute of Information Technology, Islamabad, Pakistan Aqeel A. Syed, Department of Electronics, Quaid-i-Azam University, Islamabad, Pakistan Qaisar A. Naqvi, Department of Electronics, Quaid-i-Azam University, Islamabad, Pakistan Journal International Journal of Applied Electromagnetics and Mechanics Online ISSN 1875-8800 Print ISSN 1383-5416

Description: The contact behavior between a transversely isotropic piezoelectric material and a rigid-conducting punch of flat-end was analyzed under the condition that there is no biased-electric potential applied to the punch. Two limiting cases were studied; one was for semi-infinite piezoelectric materials and the other for piezoelectric films with contact radius much larger than the film thickness. Analytical relationships were derived between the indentation load and the indentation depth and between the indentation-induced potential and the indentation depth. Both the indentation load and the indentation-induced potential are proportional to the indentation depth. For the adhesive contact, the pull-off force is proportional to the 3/2 power of the punch radius for semi-infinite piezoelectric materials and to the square of the punch radius for piezoelectric films. The piezoelectric charge coefficient determined from the contact deformation of a piezoelectric film with contact radius much larger than the film thickness is only dependent on dielectric constant and piezoelectric constant. Content Type Journal Article Pages - DOI 10.3233/JAE-131721 Authors Fuqian Yang, Materials Program, Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA. Tel.: +1 859 257 2994; Fax: +1 859 323 1929; E-mail: fyang0@engr.uky.edu Journal International Journal of Applied Electromagnetics and Mechanics Online ISSN 1875-8800 Print ISSN 1383-5416

Description: This paper deals with the novel structure and coupling analysis of a 3-degrees of freedom (3-DOF) conical magnetic bearing. The conical stators of the bearing are designed symmetrical to provide the axial control exclusively, and the radial stators are separated by nonmagnetic material between X and Y channels, so the magnetic flux path can be separated among different channels. The configuration and working principle of the bearing are provided, and the mathematical model is derived based on the bias and control magnetic circuits. In order to evaluate the degree of force coupling between different channels, the concept of coupling factor is proposed, which is defined as the ratio of force variation caused by coupling to the original force when there is no coupling. The coupling factors are analyzed not only among the translational movement of X, Y and Z channels but also between the translational and rotational degrees of freedom. The calculation results show that although the component coupling factors of each magnetic poles are a little larger, the resultant ones in X, Y and Z directions of the designed bearing are all less than 4%. Therefore, the magnetic forces and torques of different channels are weakly coupled, and it is convenient for the control of the magnetic bearing. Content Type Journal Article Pages - DOI 10.3233/JAE-131725 Authors Chun'e Wang, Science and Technology on Inertial Laboratory, Fundamental Science on Novel Inertial Instrument and Navigation System Technology Laboratory, Beihang University, Beijing, China Jiancheng Fang, Science and Technology on Inertial Laboratory, Fundamental Science on Novel Inertial Instrument and Navigation System Technology Laboratory, Beihang University, Beijing, China Jiqiang Tang, Science and Technology on Inertial Laboratory, Fundamental Science on Novel Inertial Instrument and Navigation System Technology Laboratory, Beihang University, Beijing, China Jinji Sun, Science and Technology on Inertial Laboratory, Fundamental Science on Novel Inertial Instrument and Navigation System Technology Laboratory, Beihang University, Beijing, China Journal International Journal of Applied Electromagnetics and Mechanics Online ISSN 1875-8800 Print ISSN 1383-5416

Description: In order to improve recycling quality of asphalt mixtures based on microwave heating, thermoelectric coupling theory is researched. Heat conduction equation is built according to Fourier's Law. Series model, parallel model and Maxwell model are studied to solve thermal conductivity of asphalt mixtures. Radiation field model of pyramidal horn antenna is set up and mean value of electric field intensity is measured by experiment. Thermoelectric coupling model is built on the basis of dielectric property of asphalt mixtures. Numerical simulation is performed for the model. It is found that influence of asphalt-aggregate ratio on temperature field is not distinct. Average temperature of asphalt mixtures is related to microwave power and increases with microwave power linearly. The asphalt mixtures using diorite as aggregate have a strongest adsorption capability to energy. The result can simulate hot in-place regeneration process, and has important significance to improve regeneration quality of asphalt mixtures. Content Type Journal Article Pages - DOI 10.3233/JAE-131722 Authors Tongsheng Sun, School of Mechanical and Automotive Engineering, Anhui Polytechnic University, Wuhu 241000, Anhui, China. Tel.: +86 553 287 1252; E-mail: suntongsheng@ahpu.edu.cn Journal International Journal of Applied Electromagnetics and Mechanics Online ISSN 1875-8800 Print ISSN 1383-5416

Description: Design optimization of antennas is challenging, in most cases it involves electromagnetic (EM) simulations. High-fidelity simulation is computationally expensive and, therefore, employing EM solver in an optimization loop may be prohibitive. In this paper, we discuss optimization approaches that exploit coarse-discretization EM simulations as a low-fidelity model, and allow us to locate the optimum design of the antenna at a low computational cost. Some practical issues, including the importance and selection of the model fidelity are also discussed. Content Type Journal Article Pages - DOI 10.3233/JAE-131726 Authors Slawomir Koziel, School of Science and Engineering, Engineering Optimization and Modeling Center, Reykjavik University, Reykjavik, Iceland Stanislav Ogurtsov, School of Science and Engineering, Engineering Optimization and Modeling Center, Reykjavik University, Reykjavik, Iceland Journal International Journal of Applied Electromagnetics and Mechanics Online ISSN 1875-8800 Print ISSN 1383-5416

Description: The paper proposes an optimization procedure suited to design the shape and the current feed of active coils. A suitable spline-based basis is used for the coil geometry modeling, based on a rather limited number of optimization parameters. In order to simplify the constraints treatment, a set of knot points are introduced, linked with the design degrees of freedom. Content Type Journal Article Pages - DOI 10.3233/JAE-131727 Authors Andrea Gaetano Chiariello, Dipartimento di Ingegneria Industriale e della Informazione, Seconda Università di Napoli, Aversa, Italy Alessandro Formisano, Dipartimento di Ingegneria Industriale e della Informazione, Seconda Università di Napoli, Aversa, Italy Raffaele Martone, Dipartimento di Ingegneria Industriale e della Informazione, Seconda Università di Napoli, Aversa, Italy Journal International Journal of Applied Electromagnetics and Mechanics Online ISSN 1875-8800 Print ISSN 1383-5416

Description: We propose a general global optimal algorithm to optimize the miniature permanent magnet structure of a micro magnetic resonance chip (μ NMR-chip). For this purpose, we analyze the sensitivity of the permanent magnet structure to the design variables and determine the optimization variables. After this, radial basis function neural networks (RBFNNs) are constructed to model the objective functions, and the nondominated sorting genetic algorithm II (NSGA II) is improved by introducing a different weighting factor for each objective function in calculating the crowding distance. Combining the RBFNN with the improved NSGA II optimizes the miniature permanent magnet structure. Through comparison, the optimization solutions are proven effective. Finally, the optimized permanent magnet structure is manufactured and tested experimentally. After optimization, the volume of the permanent magnet block is reduced by 39%, and the permanent magnet becomes easier to manufacture. Content Type Journal Article Pages - DOI 10.3233/JAE-131678 Authors Rongsheng Lu, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, Jiangsu, China Hong Yi, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, Jiangsu, China Weiping Wu, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, Jiangsu, China Yun Jiang, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, Jiangsu, China Zhonghua Ni, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing, Jiangsu, China Journal International Journal of Applied Electromagnetics and Mechanics Online ISSN 1875-8800 Print ISSN 1383-5416

Description: In this paper, we propose a new method for solving the Loney's solenoid benchmark problem based on stem cells algorithm (SCA). The key idea of the algorithm is using a modified version of our proposed stem cells optimization method that can efficiently achieve the best solution for the position and size of two correcting coils in the famous Loney's solenoid problem. The results show the superiority of the proposed method on other previously proposed methods for electromagnetic optimization. Content Type Journal Article Pages - DOI 10.3233/TAD-131675 Authors Mohammad Taherdangkoo, Taba Medical Imaging Center, 444 Felestin Street, Shiraz, 713 475 3151, Iran. Tel.: +98 711 231 7801; Fax: +98 711 235 7088; E-mail: mtaherdangkoo@yahoo.com Journal International Journal of Applied Electromagnetics and Mechanics Online ISSN 1875-8800 Print ISSN 1383-5416

Description: In this paper the dynamical characteristics of a ferrofluid acceleration sensor are studied experimentally and theoretically. The stiffness coefficient and damping coefficient are key factors in dynamical characteristics of a ferrofluid acceleration sensor. The damping coefficient depends on the viscosity of ferrofluid. The experimental data is very close to theoretical calculation. Content Type Journal Article Pages - DOI 10.3233/TAD-131677 Authors Qiang Li, Department of Mechatronic Engineering, Hubei University for Nationalities, Enshi, Hubei, China Zuobin Yuan, Department of Mechatronic Engineering, Hubei University for Nationalities, Enshi, Hubei, China Yongming Yang, Department of Mechatronic Engineering, Hubei University for Nationalities, Enshi, Hubei, China Jun Lv, Department of Mechatronic Engineering, Hubei University for Nationalities, Enshi, Hubei, China Hui Xiang, Department of Mechatronic Engineering, Hubei University for Nationalities, Enshi, Hubei, China Journal International Journal of Applied Electromagnetics and Mechanics Online ISSN 1875-8800 Print ISSN 1383-5416

Description: In this paper, radar target recognition is given by KSDA (kernel scatter-difference discriminant analysis) pattern recognition on RCS (radar cross section). The kernel method converts the traditional FLDA (Fisher linear discriminant analysis) to a nonlinear high-dimensional space and such a kernel technique is called KFDA (kernel Fisher discriminant analysis). The basic concept of KFDA is to map training samples in the original space to a high-dimensional feature space via a nonlinear mapping function. Pattern recognition is then implemented in the feature space through extracted nonlinear discriminant features. However, as the kernel within-class scatter matrix is singular, the optimal discriminant features can not be achieved directly. To improve this drawback of KFDA, this study utilizes the scatter difference as the discriminant function, i.e., KSDA, to implement radar target recognition. The KSDA can modify the Fisher discrimination function and then serves as an efficient tool of radar target recognition. As a result, the computational complexity is reduced and then the computational speed is increased. Of great importance, the proposed target recognition scheme (based on KSDA) can still work well even though the kernel within-class scatter matrix is singular. Our KDSA based target recognition scheme is accurate, efficient and has good ability to tolerate random noises. Content Type Journal Article Pages - DOI 10.3233/JAE-131673 Authors Sheng-Chih Chan, Department of Systems and Naval Mechatronic Engineering, National Cheng-Kung University, Tainan, Taiwan Kun-Chou Lee, Department of Systems and Naval Mechatronic Engineering, National Cheng-Kung University, Tainan, Taiwan Journal International Journal of Applied Electromagnetics and Mechanics Online ISSN 1875-8800 Print ISSN 1383-5416