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Roles of grain boundaries in cleavage cracking and thermal crack arrest experiments in iron-silicon alloy
(Massachusetts Institute of Technology, 2002)
High-angle grain boundaries in steel offer an important resistance to the propagation of cleavage cracks that affects the fracture toughness and can modulate the ductile-to-brittle transition temperature of fracture downward. ...
Finite element analysis of shells with layers
(Massachusetts Institute of Technology, 2002)
It is well established that thin shell structures frequently feature narrow bands of strain concentration and localized displacement irregularities referred to as boundary and internal layers. It is crucial to capture these ...
A model for sample stacking in microcapillary DNA electrophoresis
(Massachusetts Institute of Technology, 2002)
Sanger's method of chain termination is the method of choice in DNA sequencing, where electrophoresis is used to separate the different sized DNA. In the past decade, microfabricated capillary devices have been developed ...
A "HUM" conjugate gradient algorithm for constrained nonlinear optimal control : terminal and regular problems
(Massachusetts Institute of Technology, 2002)
Optimal control problems often arise in engineering applications when a known desired behavior is to be imposed on a dynamical system. Typically, there is a performance and controller use trade-off that can be quantified ...
Global parameter identification and control of nonlinearly parameterized systems
(Massachusetts Institute of Technology, 2002)
Nonlinearly parameterized (NLP) systems are ubiquitous in nature and many fields of science and engineering. Despite the wide and diverse range of applications, there exist relatively few results in control systems literature ...
Mechanics of inelastic deformation and delamination in paperboard
(Massachusetts Institute of Technology, 2002)
Paperboard is one of the most widely used materials. The inelastic deformation of paperboard plays a crucial role during many manufacturing processes (e.g., the converting process whereby paperboard is converted into a ...
Mobility design and control of personal mobility aids for the elderly
(Massachusetts Institute of Technology, 2002)
Delaying the transition of the elderly to higher level of care using assistive robotic devices could have great social and economic significance. The transition, necessitated by the degradation of physical and cognitive ...
Evolution of movement smoothness and submovement patterns in persons with stroke
(Massachusetts Institute of Technology, 2002)
Smoothness is characteristic of coordinated human movements, and stroke patients' movements seem to grow more smooth with recovery. A robotic therapy device was used to analyze five different measures of movement smoothness ...
Design and analysis of fingernail sensors for measurement of fingertip touch fouce and finger posture
(Massachusetts Institute of Technology, 2002)
A new type of wearable sensor for detecting fingertip touch force and finger posture is presented. Unlike traditional electronic gloves, in which sensors are embedded along the finger and on the fingerpads, this new device ...
Wrinkling and sagging of viscous sheets
(Massachusetts Institute of Technology, 2002)
This thesis explores the wrinkling and sagging behavior of thin viscous Newtonian sheets and filaments motivated by analogous scenarios in elasticity. These problems involve dynamic free boundaries and geometric nonlinearities ...