Browsing Mechanical engineering by Title
Now showing items 138-157 of 188
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Pattern-less Electromagnetic Wave Manipulation by Active Control of Tunable Metamaterials
(2012-09-13)Terahertz technologies have been attracting attention over the past few years due to their unique applications in bio-chemical sensing, bio-imaging, spectroscopy, security, and communications. Traditionally, these applications ... -
Performance Evaluation, Emulation, and Control of Cross-Flow Hydrokinetic Turbines
Cross-flow hydrokinetic turbines are a promising option for effectively harvesting energy from fast-flowing streams or currents. This work describes the dynamics of such turbines, analyzes techniques used to scale turbine ... -
Permanent growth characteristics oa alloy cast iron when exposed to a temperature gradient.
(1932)The object of this investigation was to determine the growth characteristics of cast iron with varying alloy additions, when exposed to a temperature gradient and to repeated heating. That is, it was to measure the change ... -
Phase Transformations in Free Films
(2013-02-25)The purpose of this dissertation is to present the derivation of the governing equations for a free-film undergoing phase separation using a long-wavelength approximation to the Navier-Stokes equations coupled with the ... -
Prediction of Sudden Cardiac Arrest for Patients with Congestive Heart Failure
Sudden cardiac death (SCD) is responsible for 200,000-450,000 adult deaths each year in the United States. Since sudden cardiac arrest (SCA) can happen unexpectedly, implantable-cardioverter defibrillators (ICDs) are ... -
Pretouch Sensing for Robotic Grasping
Robotic grasping of unknown objects is recognized to be a challenging problem; this is due to the uncertainty of object shape, caused by the imperfect perception capability of the robot. Vision and depth sensors are ... -
Pretouch Sensing for Robotic Grasping
Robotic grasping of unknown objects is recognized to be a challenging problem; this is due to the uncertainty of object shape, caused by the imperfect perception capability of the robot. Vision and depth sensors are ... -
Properties of the Acoustic Vector Field in Underwater Waveguides
(2013-07-25)This thesis focuses on the description and measurement of the underwater acoustic field, based on vector properties of acoustic particle velocity. The specific goal is to interpret vector sensor measurements in underwater ... -
A Prosthetic Ankle Design to Improve Stair Ambulation for Transfemoral Amputees
The aim of this thesis is to design a prosthetic ankle to improve stair ambulation for transfemoral (above knee) amputees. Even though many prosthetic knees offer stair descent capabilities, no prosthetic ankle provides a ... -
PZT Thin Film Micro Probe Device with Dual Top Electrodes
(2013-07-25)Lead zirconate titanate (PZT) thin-film actuators have been studied intensively for years because of their potential applications in many fields. In this dissertation, a PZT thin-film micro probe device is designed, ... -
Quantifying Patient-Specific Plantar Soft Tissue Stiffnessusing Magnetic Resonance Imaging and a HydraulicLoading Device
Diabetes mellitus is a prevalent health concern in the United States that has many adverse symptoms, one of which is increased plantar soft tissue stiffness. This change in the mechanical properties of foot tissue has been ... -
Resistive Embedded Heating for Homogeneous Curing of Composite Damage Repair
The increased use of composite materials in passenger aircrafts has resulted in an escalation of maintenance issues associated with composite structure damage from a variety of causes including impacts during towing, bird ... -
Resolving Spatial Resource Gradients at Tidal Energy Sites
(2012-08-10)Station-keeping, a vessel-based spatial surveying method for resolving details of the hydrokinetic resource, is presented in the context of the general methodology and also for the specific case of a survey conducted in ... -
Rheology and Microfluidic flows of a cationic surfactant and hydrotropic salt mixture
The widespread use of wormlike micellar solutions is commonly found in household items such as cosmetic products, industrial fluids used in enhanced oil recovery and as drag reducing agents, and in biological applications ... -
Rule based behavior classification via accelerometry in transtibial amputees
A high-performing and comfortable prosthesis follows from an understanding of how amputee activity modulates residual limb volume and socket fit. There are currently very few systems available which capture general long-term ... -
Screening Tests of Composites for Use in Tidal Energy Devices
(2011-06-09)Four different composite material systems are subjected to nine months of in situ exposure at a potential tidal energy site. These four systems are fiberglass/epoxy, carbon fiber/epoxy, fiberglass/vinylester, and carbon ... -
Sensing and Actuating with Fringing Electric Field
(2013-04-17)Many researchers worldwide have used the fringing electric field (FEF) to develop different devices and technologies to fulfill industrial requirements. In some cases, simple analytical models fulfill development requirements, ... -
Separative magnetization transport: theory, model, and experiment
We present a theoretical framework for modeling the transport of any number of globally con- served quantities, in any spatial configuration, and apply it to obtain a model of magnetization transport for spin-systems with ... -
Solid-state Polymer Nanofoams
This work explores the fabrication and properties of solid-state polymer nanofoams. Polymer nanofoams, which are expected to be the next generation cellular materials, have attracted much attention in the past decade. ...