International Journal of Applied Electromagnetics and Mechanics - Volume 45, issue 1-4

Authors: Hu, Guanzhong | Li, Yuling | Yang, Shiyou | Chu, Jianglong | Bai, Yanan | Huang, Jin

Article Type: Research Article

Abstract: The magnetic nanoparticles in AC alternating magnetic fields will produce a large amount of heats due to the Néer relaxation. Magnetic Fluid Hyperthermia (MFH), based on this mechanism, offers a new breakthrough and has a promising potential in tumor treatments. The temperature field distribution in the treatment and neighbor regions has a significant effect on the therapeutic result. Therefore, it is essential to control the temperature in the treatment region in a proper range (42°C∼90°C) while …to guarantee a sharp gradient in the boundary of the treatment and normal regions. This study provides an automatic shape design methodology using the Finite Element Analysis (FEA) of the electromagnetic-temperature Coupled Field (CF) and a multi-objective Particle Swarm Optimization (MOPSO), to realize sufficient uniformities in the temperature field distribution while to ensure the enough temperature gradient in the cancer boundary. Show more

Keywords: Magnetic fluid hyperthermia, magnetic nanoparticles, optimization

DOI: 10.3233/JAE-141895

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 697-702, 2014

Authors: Zhang, Wei | Yang, Shiyou | Bai, Yanan

Article Type: Research Article

Abstract: To develop an efficient robust optimal method for numerical solutions of inverse problems, a metaheuristic based on ant colony optimization (ACO) algorithms is proposed. In accordance to robust design specifications, the algorithm iterative procedures are redesigned, and the methodology and mechanism for reducing the heavy computational burdens associated with robust performance computations are introduced. To validate the feasibility and showcase the merits, of the proposed method, it is used to solve an engineering …inverse problem with promising results. Show more

Keywords: Ant colony algorithm, inverse problem, robustness, uncertainty

DOI: 10.3233/JAE-141896

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 703-708, 2014

Authors: Oshiumi, Tsubasa | Niguchi, Noboru | Hirata, Katsuhiro

Article Type: Research Article

Abstract: This paper proposes a new magnetic-geared generator, which has a novel permanent magnet arrangement whereby the permanent magnets are embedded into the high-speed rotor and the stator slots, for direct-drive wind power generation systems. The operational principle is described and the performance is verified by using finite element analysis.

Keywords: Magnetic-geared generator, wind power generation, direct-drive systems, finite element method

DOI: 10.3233/JAE-141897

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 709-715, 2014

Authors: Kudo, Miu | Hojo, Maki | Okuyama, Takeshi | Yoshizawa, Toyoko | Atogami, Fumi | Nakamura, Yasuka | Tanaka, Mami

Article Type: Research Article

Abstract: In Japan, midwives perform Japanese hands-on (perineal support), which is important to prevent perineal tears and to deliver safely. However, it is difficult for trainee midwives to acquire the procedures. Therefore, the advanced delivery simulator that enables the midwives to evaluate the skill objectively is demanded. In this paper, for realizing the delivery simulator, we focus on the pressure of midwives' fingers and palms during Japanese hands-on. Fundamental experiments were carried out using flexible pressure …sensors. In experiments, six experts perform the Japanese hand-on using normal delivery phantom. From the analysis of pressure profile, the cooperation of the left and right hand was investigated. Show more

Keywords: Midwife, perineal support, delivery, simulator, expert skill

DOI: 10.3233/JAE-141898

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 717-722, 2014

Authors: Tanaka, Mami | Tamura, Makoto | Okuyama, Takeshi

Article Type: Research Article

Abstract: Palpation is a simple diagnosis method that doctors examine body and organs of patients by feeling with their hand. However, palpation is not objective because the palpation sensitivity depends on skill and experience of doctors. Therefore, an objective method for measuring tactile information is required. In this study, a palpation sensor system for detecting a lump is proposed and fabricated. Fundamental characteristics of the sensor are examined by using measuring objects made of polyurethane resin and …aluminium rods as a lump. A peak waveform appears in the sensor output when the sensor is above the lump. In addition, the measuring objects using the silicone cylinder are made in place of aluminium rod. Also, the experiment is done, and the features of peaks are investigated. From the results, it is confirmed that the sensor is available to detect the lump. Show more

Keywords: Palpation, detection of lump, roller sensor

DOI: 10.3233/JAE-141899

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 723-729, 2014

Authors: Okuyama, Takeshi | Hatakeyama, Kazuki | Tanaka, Mami

Article Type: Research Article

Abstract: This study describes the development of a sensor system for measuring human scratching motion. In order to measure the scratching motion, we focus on the mechanical vibration between the nail and the skin that is scratched. Scratching sounds, induced by the vibration, change according to the scratching intensity or the skin condition. Therefore, the information on the scratching sounds can help us to evaluate the characteristics of scratching. In this study, a nail-mounted compact microphone sensor …for measuring human scratching sounds is designed and fabricated. First, the ability of the proposed sensor to measure scratching sounds is investigated. The feasibility of this sensor has been verified. Next, the power spectrum density is calculated from the sensor output to investigate the characteristics of the scratching sounds according to the scratching intensity. It was found that frequency components increased with an increase in the contact force during scratching. The results suggest that it is possible to evaluate the scratching intensity by using the proposed sensor system. Show more

Keywords: Scratching, skin, sensor, microphone, scratching intensity

DOI: 10.3233/JAE-141900

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 731-737, 2014

Authors: Le, Minhhuy | Kim, Jungmin | Vu, Hoanghai | Do, Hwa Sik | Lee, Jinyi

Article Type: Research Article

Abstract: This paper presents a nondestructive evaluation algorithm for locating, discriminating, and evaluating inner and outer diameter (ID and OD) corrosion on a small-bore pipe by means of a bobbin-type magnetic camera that uses arrayed solid-state Hall effect sensor elements for measuring alternating magnetic fields. The proposed magnetic camera system is used to experimentally measure artificial ID and OD hole-type cracks on a small-bore copper alloy pipe over a low-frequency range (2–8 kHz). The measured amplitude signal …is analyzed to determine both the position and type of crack. The volumes of the cracks are estimated with standard deviation of 0.77 mm^{3} to be in the range 1.00–9.01 mm^{3} . Show more

Keywords: NDE, inner and outer diameter corrosion, bobbin-type magnetic camera, hall effect sensor, heat exchanger

DOI: 10.3233/JAE-141901

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 739-745, 2014

Authors: Angani, Chandra Sekhar | Kim, Jungmin | Le, Minhhuy | Lee, Jinyi

Article Type: Research Article

Abstract: Inclusions in steel are entrapped foreign materials, which may be metallic or non-metallic. The inclusions disrupt the structural homogeneity of the steel and affect its mechanical properties. Moreover, nonmetallic inclusions such as calcium and magnesium can be propagated as narrow cracks in steel strips after the rolling process. In this paper, we propose the use of magnetic flux leakage testing involving the fusion of images obtained by arrays of linearly integrated Hall sensors (LIHaS) and linearly …integrated giant magnetoresistance sensors (LIGiS) for inspecting inclusions in steel strips. In the proposed method, the normal (Bz) and tangential (Bx) components of the magnetic leakage field around an inclusion are detected by means of LIHaS and LIGiS, respectively. The images of the magnetic leakage field were obtained at different scanning (magnetization) directions relative to the rolling direction. The Bz and Bx images of the inclusion are then combined by using image fusion technique to enhance the detection of the inclusion. The effectiveness of the proposed image fusion technique was experimentally verified by using LIHaS and LIGiS images of an inclusion in a cold-rolled steel strip. Show more

Keywords: Strip steel, inclusion, LIHaS, LIGiS

DOI: 10.3233/JAE-141902

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 747-753, 2014

Authors: Xie, Shejuan | Chen, Zhenmao | Chen, Hong-En | Sato, Seiya | Uchimoto, Tetsuya | Takagi, Toshiyuki | Yoshida, Yasuhiko

Article Type: Research Article

Abstract: Plastic deformation, as a type of micro-damage caused by external loads such as earthquake, is necessary to be evaluated by using an efficient non-destructive evaluation technique in order to guarantee the structural safety. In this paper, the feasibility of the pulsed eddy current testing method for evaluating the plastic deformation in an austenitic stainless steel has been studied through experiments and simulations. Moreover, the electromagnetic property variations due to plastic deformation have also been …investigated. Show more

Keywords: Non-destructive evaluation, plastic deformation, pulsed ECT, electromagnetic property

DOI: 10.3233/JAE-141903

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 755-761, 2014

Authors: Murakami, Iwanori | Imai, Hiroshi | Ando, Yoshinori | Yamada, Kou

Article Type: Research Article

Abstract: To date, the majority of artificial hearts have been nonpulsatile types. Natural hearts, however, are pulsatile, and the long-term biocompatibility of the nonpulsatile types has not been confirmed. We set out to develop a magnetic pump with a pulsatile flow. Because it is pulsatile, we were able to make this pump as small and compact as a natural heart. It consists of a motor, a bellows, and a permanent magnet. The pulsatile flow artificial heart relies …on magnetic force. To determine the basic characteristics of the pump, we measured the flow, pressure and magnetic force. We describe the structure of the pump, it's manufacturing method, and it's principle of operation. The use of the bellows allows us to realize a structure where the fluid chambers and drive are separate. When the pump pulsated at 0.6 [Hz], the rate of flow was 0.618 [l/min]. The differential pressure between inflow and outflow was 3.5 [kPa]. The magnetic attractive force was 243.4 [N] and the magnetic repulsive force was 67.3 [N]. We confirmed that the pump was able to pump water by pulsating steadily. Show more

Keywords: Pump, artificial heart, magnetic force, magnetic flux concentration

DOI: 10.3233/JAE-141904

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 763-769, 2014