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A novel microfluidic device is described that can detect the chemotactic response of motile bacterial cells (Escherichia coli) that swim toward a preferred nutrient with high resolution by sorting and concentrating them. The device consists of the typical Y-shaped microchannels that have been widely used in chemotaxis studies to attract cells toward a high concentration and a concentrator array integrated...
This paper presents an out-of-plane micromachined piezoresistive flow sensor array based on laser micromachining of polymer films, microstencil printing, and stress-engineered curvature. The developed process is suitable for low cost, large-area sensor array fabrication, and can leverage traditional flex-circuit fabrication. Each device is composed of an out-of-plane curved microtuft formed from laser-machined...
Switched array antenna with six microstrip patch elements was designed and characterized for UHF RFID application. A hexagonal-shaped RF switching circuit board was developed to select one of the array elements to read RFID tags surrounding the RFID reader antenna. The designed switching network ports have exhibited isolation greater than 30 dB and insertion loss less than 2.4 dB. The polarization...
Visible evidence of spinal column damage is only apparent in 14% of the patients who receive spinal damage. We use a humidity sensor array. The humidity sensor (HDP-05) is arranged and attached to pre-assigned regions along the spinal column nerve of the actual patient. Applying pressure to the urinary bladder causes the patient to sweat. It is possible to determine which spinal column autonomic nerve...
We report a fabrication of ferromagnetic iron nanowires by thermally decomposing iron pentacarbonyl molecules under the magnetic field. The nanowire array is fabricated through the pile-up of magnetic iron particles under the magnetic field. We observed that shapes of nanowires depend on iron pentacarbonyl vapor pressures. We observed three pressure ranges responsible for three kinds of nanowire shapes...
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