Publications

Wireless sensor networks provide an opportunity to improve performance in areas ranging from energy efficiency to industrial processes to scientific research. Many applications require awareness of sensor location, but autonomously determining device location has proven to be challenging. This localization problem can be divided into two parts: measuring relationships between nodes, and then using these relationships to estimate location. Most work on the first part has measured the RF received signal strength as a surrogate for range resulting in poor location accuracy. Several other...

This dissertation has two distinct goals. The first is to fabricate a MEMS Lorentz force navigation magnetometer using the same techniques as gyroscopes and accelerometers allowing for construction of a single ...

There is a growing need for technology that can control microscale oxygen gradients onto a tissue or culture sample in vitro. This dissertation introduces the oxygen microgradient chip (OMA), which employs electrolysis to generate oxygen microgradients within cell culture without forming bubbles. Dissolved oxygen generated at noble microelectrodes patterned on a chip surface diffuses through a gas-permeable silicone membrane and is dosed into cell culture. The amount of generated oxygen is directly proportional to a current flowing across the electrodes and thus can be controlled...

In this work, siliconbased twolayer microfluidic evaporators were designed, fabricated, and tested in an experimental study designed to examine the effects of outofplane vaporization and subsequent lateral convection on the effective inplane thermal conductivity of the device. The evaporator region in all devices measured 10 mm x 10mm, with an overall device size of 24...