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Evaluation and improvement of proactive customer notification in e-commerce environment
(Massachusetts Institute of Technology, 2005)
The Internet, and thus e-commerce, both Business to Consumer (B2C) and Business to Business (B2B), has changed the way companies do business with each other and communicate with their customers. Because of the speed of the ...
Characterization of macro-length conducting polymers and the development of a conducting polymer rotary motor
(Massachusetts Institute of Technology, 2005)
Conducting polymers are a subset of materials within the electroactive polymer class that exhibit active mechanical deformations. These deformations induce stresses and strains that allow for conducting polymers to be used ...
Modelling of a floating piston expander employed in a 10 K cryocooler
(Massachusetts Institute of Technology, 2005)
A single stage of a 3-stage Collins-type cryocooler designed to provide I W of cooling at 10 K was constructed and tested. A single stage of the cryocooler consists of a compressor, a counter-flow heat exchanger, and an ...
Rubber bearings for precision positioning systems
(Massachusetts Institute of Technology, 2005)
In this thesis we investigate the use of thin rubber sheets or laminates of metal and rubber sheets as bearings in precision positioning systems. Such bearings have the potential to replace more conventional flexures ...
Effects of operating conditions, compression ratio, and gasoline reformate on SI engine knock limits
(Massachusetts Institute of Technology, 2005)
A set of experiments was performed to investigate the effects of air-fuel ratio, inlet boost pressure, hydrogen rich fuel reformate, and compression ratio on engine knock behavior. For each condition the effect of spark ...
Effects of select fluids on the friction of metal-on-polyethylene joint replacement surfaces
(Massachusetts Institute of Technology, 2005)
Lubricants are important factors in the tribology of total joint arthroplasty (TJA) surfaces, which are primarily comprised of a polished metallic or ceramic component articulating on an Ultra-High Molecular Weight ...
Feedback control of separation in unsteady flows
(Massachusetts Institute of Technology, 2005)
Prandtl (1904) showed that in a steady flow past a bluff body, streamlines separate from the boundary where the skin friction (or wall shear) vanishes and admits a negative gradient. Despite initial suggestions, however, ...
Towards verifiable adaptive control for safety critical applications
(Massachusetts Institute of Technology, 2005)
To be implementable in safety critical applications, adaptive controllers must be shown to behave strictly according to predetermined specifications. This thesis presents two tools for verifying specifications relevant to ...
Design of an MRI compatible robot for wrist rehabilitation
(Massachusetts Institute of Technology, 2005)
Magnetic Resonance Imaging (MRI) can be used to study the effects of robotic therapy on stroke patients. This thesis focuses on the design of an MRI compatible wrist robot to be used as a clinical tool for studying the ...
Hydrogen storage of energy for small power supply systems
(Massachusetts Institute of Technology, 2005)
Power supply systems for cell phone base stations using hydrogen energy storage, fuel cells or hydrogen-burning generators, and a backup generator could offer an improvement over current power supply systems. Two categories ...