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A spur gear is the most common type of gears. They are mounted on parallel shafts, as shown in Fig. 1(a). Mechanical spur gears, which play important roles in transmission systems, inherently suffer from the drawbacks of high transmission loss, bulky size, high noise, wear-and-tear [1,2]. Magnetic spur gears can readily replace mechanical spur gears. Magnetic spur gears have no cut teeth or cogs and...
Many Types of non-contact magnetic devices(NCMDs) exist, such as eddy current brake(ECB), magnetic coupling(MC), and magnetic gear(MG). When the conductive materials of NCMDs are exposed to time-varying magnetic field, eddy current is induced in the conductive materials. In contrast to the ECB which directly uses eddy current to generate a torque, the MC and MG require analysis of the eddy current...
A Solar eclipse event occurred on 22 July 2009 over South Korean Peninsula with a maximum obscuration of ∼84% has been investigated to discuss the variations in the mid-latitude ionosphere. Study of solar eclipse effect on the different ionospheric regions (espcially D-region) has been limited till today, although there is a few studies concentrated on the electron density variations and GPS TEC measurements...
Magnetic nanoparticles residing in living tissues under external magnetic field may induce tissue displacement that can be measured by ultrasound imaging. We propose a method to take magnetic force images which is proportional to the magnetic nanoparticle density under the assumption of mechanical coupling of the nanoparticles with background tissues. After measuring the axial displacement component...
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