Kristofer S.J. Pister (Advisor)

Water shortages, particularly evident in the state of California, emphasize the need for a better hydrologic understanding, and improved water management techniques. The majority of the state’s water originates in the Sierra Nevada as snow, melting throughout the year to meet the needs of various stakeholders. Current measurement techniques are unable to resolve variability of the snowpack at the basin scale, and snowmelt processes are not well captured by existing hydrologic models. A system-level solution is introduced to facilitate scientific understanding and water management...

Surface micromachined four terminal relays have been fabricated, tested, and packaged. The relays are implemented in a foundry process with minimal post-processing. They show on resistances as low as 20mW, current carrying capacities as highas 0.48 Amps, and lifetimes in the millions of cycles while hot switching 80mA. These devices are thus competitive with commercial macroscopic relays.

Achieving these high performance and reliability levels required exploring the physics and tribology of microrelays and using novel physical experiments to outline a...