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Mechanics of abrasive wear of elastomeric materials
(Massachusetts Institute of Technology, 2003)
Elastomeric materials are widely used as tire and sealing materials due to their ability to undergo large deformations and conform to the mating surface. However, their applications often result in repeated contact with ...
Memory consistency models for high performance distributed computing
(Massachusetts Institute of Technology, 2001)
This thesis develops a mathematical framework for specifying the consistency guarantees of high performance distributed shared memory multiprocessors. This framework is based on computations, which specify the operations ...
Constitutive modeling of Cu-Al-Ni shape memory alloys
(Massachusetts Institute of Technology, 2000)
Certain alloys can exist in multiple phases, which, in the context of solids, essentially mean multiple crystallographic structures. For example, at certain compositions, a Cu-Al-Ni alloy can exist as a cubic lattice ...
The biomechanics of knees at high flexion angles before and after Total Knee Arthroplasty
(Massachusetts Institute of Technology, 2004)
Total Knee Arthroplasty (TKA) was initially developed to alleviate pain in the case of severe arthritis of the knee. Restoration of knee motion has been an on going issue for the last decade. Contemporary TKAs appear to ...
Closed-loop, variable-valve-timing control of a controlled-auto-ignition engine
(Massachusetts Institute of Technology, 2004)
The objective of this study was to develop a closed-loop controller for use on a Controlled-Auto- Ignition (CAI) / Spark-Ignition (SI) mixed mode engine equipped with a variable-valve-timing (VVT) mechanism. The controller ...
Strain-tuning of periodic optical devices : tunable gratings and photonic crystals
(Massachusetts Institute of Technology, 2003)
The advancement of micro- and nano-scale optical devices has heralded micromirrors, semiconductor micro- and nano-lasers, and photonic crystals, among many. Broadly defined with the field of microphotonics and microelect ...
Stochastic recruitment strategies for controlling artificial muscles
(Massachusetts Institute of Technology, 2009)
This thesis presents a new architecture for controlling active material actuators inspired by biological motor recruitment. An active material is broken down into many small fibers and grouped together to form one large ...
Integrated strain actuation in aircraft with highly flexible composite wings
(Massachusetts Institute of Technology, 2003)
The purpose of this thesis is to provide a framework for the study of wing warping as a means of achieving multiple aeroelastic goals. Shape change is achieved by integrating anisotropic piezoelectric composites (APC) ...
Efficient computational methods for robustness analysis
(Massachusetts Institute of Technology, 2002)
Issues of robust stability and performance have dominated the field of systems and control theory because of their practical importance. The recently developed Integral Quadratic Constraint (IQC) based analysis method ...
Cell-matrix interactions : collagen-GAG scaffold fabrication, characterization, and measurement of cell migratory and contractile behavior via confocal microscopy
(Massachusetts Institute of Technology, 2006)
Three-dimensional, collagen scaffolds are an analog of the extracellular matrix and are used for many tissue engineering applications. While material and microstructural properties significantly affect overall scaffold ...