Vertically aligned carbon nanotube (CNT) arrays are grown on a moving substrate, demonstrating continuous growth of nanoscale materials with long-range order. A cold-wall chamber with an oscillating moving platform is used to locally heat a silicon growth substrate coated with an Fe/Al2O3 catalyst film for CNT growth via chemical vapor deposition. The… (More)
This thesis contributes to the development of Concentrating Solar Power (CSP) receivers and focuses on the design of an efficient aperture. An air window is proposed for use as the aperture of a CSP molten salt receiver to mitigate efficiency losses due to heat and mass transfer. The current state of the art in CSP technology is outlined with emphasis on… (More)
In the MIT Mechanical Engineering course, Introduction to Design and Manufacturing (2.007), students learn Deterministic Design, a design process similar to the scientific method approach to solving problems in the natural world. Deterministic Design merges qualities of the scientific method with the business focus of risk assessment and countermeasures,… (More)
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Submarine propulsion shafts have demonstrated acceptable reliability performance when inspected and refurbished at least every 6 years. Designers wish to extend the inspection interval to 12 years without sacrificing reliability. This interval is unprecedented, as no known submarine shafting system is currently operated with this inspection cycle, nor are… (More)
Anaerobic digesters convert organic waste (agricultural and food waste, animal or human manure, and other organic waste), into energy (in the form of biogas or electricity). An added benefit to bio-digestion is a leftover high-grade organic fertilizer. Models of the anaerobic digestion process do exist, but either rely on simple algebraic equations instead… (More)
In this paper, the design and testing of an ankle rehabilitation device is presented. The purpose of the research done is to provide physicians with a diagnostics tool that can quantitatively measure the severity of an injury by measuring the ankle joint's functional output. Torque and power output have been shown to be correlated with functional… (More)