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In this paper, a multi-physics torque simulation of the nonmagnetic rotor submerged in ferrofluid is proposed. It is noted that there is no exerted magnetic force on the nonmagnetic materials. After calculation of magnetic force densities in ferrofluid, the pressures acting on the surface of rotor can be acquired from hydrostatics. Then torque is calculated from the surface pressures of rotor. A simple...
Encoding of reward valence has been shown in various brain regions, including deep structures such as the substantia nigra as well as cortical structures such as the orbitofrontal cortex. While the correlation between these signals and reward valence have been shown in aggregated data comprised of many trials, little work has been done investigating the feasibility of decoding reward valence on a...
This paper presents cooperative formation to transport an overweight object by means of multi-robot. Previous studies on object transportation have mainly focused on multi-robot coordination and architecture. However, successful object transportation is strongly related to the robot formation in the real world. Based on this need, we suggest what is termed the pusher-puller formation, which relies...
We report contraction-expansion array (CEA) microchannels for high-yield blood plasma separation utilizing differential inertial migration. An abrupt change of the cross-sectional area curves fluid streams and accelerates the flow velocity, which induces Dean flow. Utilizing the balance between inertial lift force and Dean drag force, we were able to separate blood plasma from human whole blood with...
In this paper, nanoscale anodic oxidation lithography using an atomic force microscope (AFM) is systematically studied on carbon nanotubes (CNTs). Trends between the produced feature size and the corresponding process parameters, such as applied voltage, water meniscus length, tip speed during oxidation (hold time), and humidity are observed. By methodically varying these process parameters, the appropriate...
Au wire thermosonic wedge bonding is applied for die to die interconnect on accelerometer device as traditional Al thermo-compression wedge bonding is not suitable for this application due to the constraint of fine pitch silicon bond pad and fragile bond pad structure of MEMS devices. With thermosonic wedge bonding, a few of lifted (wedge) bonds were reported during end customer application, the lifted...
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