Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"mechanical sensors"”.
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Native plants as sentinels of tritium contamination
… monitors of radioactive waste-sites than mechanical sensors, because roots sample a larger soil volume. Tissue collection from plants to detect tritium can be completely aboveground, offers the option of transpiration capture or biomass analysis, and potentially exposes technicians to …
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Materials and design strategies for flexible electronics
… inorganic semiconductors can be used on mechanically compliant substrates for various electronic applications. Among various approaches to realize flexible electronics, deterministic printing assemblies of single-crystalline semiconducting nanomembranes on plastic substrates appear to be …
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Compensação de temperatura para sensores de corrente elétrica baseados em redes de Bragg em fibras ópticas
… temperature compensation for electrical current sensors based on fiber Bragg gratings using the twin gratings technique. The measurement of electric current by opto-mechanical sensors is very well described in the literature, as well as techniques that propose the compensation of thermal …
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The role of osteocytes in disuse and microgravity-induces bone loss
… abundant bone cell type, are thought to be key mechanical sensors in bone, yet the molecular mechanism of this action remains poorly understood. Improved understanding of how osteocytes regulate skeletal responses to mechanical loading and unloading could have significant implications for …
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Versatile and Sensitive Optical Sensing and Imaging with Spectral Interferometry
… all layers of biological tissues while they were mechanically stretched, and to probe and image microscopic mechanical sensors while they vibrate. This dissertation also describes calibration and estimation algorithms for spectral interference, or computer procedures that extract the most …
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Design of a four-point seat-belt presenter
… the seat belt. The device uses a set of four mechanical sensors to locate the position of the arm, the seat belt, and on the seat to detect when a person sits down. A control system, which utilizes logic components, then decides what direction to turn the arm in and when to stop it. The …
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EMG control of prosthetic ankle plantar flexion
… controller. The system employs input from both mechanical sensors on the ankle as well as myoelectric signals from gastrocnemius muscle of the user. This control scheme lets the user to modulate the gain of command ankle torque upon push off during level ground walking and stair ascent. It also …
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A Novel Use for Ionic Polymer Transducers for Ionic Sensing in Liquid
… electroactive polymers have been developed as mechanical sensors or actuators, taking advantage of the electromechanical coupling of the materials. This research attempts to take advantage of the chemomechanical and chemoelectrical coupling by characterizing the transient response as the …
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Capillary Force in High Aspect-Ratio Micropillar Arrays
… are important for many applications including, mechanical sensors and actuators, tunable wetting surfaces and substrates for living cell studies. However, due to their mechanical compliance and large surface area, the micropillars are susceptible to deformation due to surface forces, such as …
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Elastic stretchable optical fibers
… have properties that make them desirable as mechanical sensors and components in a range of other applications, provided current manufacturing shortcomings are addressed. The fibers could be used for light delivery to individual pixels of flexible deformable displays. They could be …
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Air-coupled non-destructive evaluation technology for condition assessment of railroad ties
… receiving end using an array of Micro-Electro Mechanical sensors (MEMs). The resulting wave field is visualized in time-space (t-x domain) and frequency-wavenumber domains (f-k domain) to derive parameters indicative of the extent of damage in crossties. A robust “wave front fitting algorithm” …
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Characterizing microearthquakes and shallow structure with dense array and optical fibers
… resilient and easier to maintain compared to mechanical sensors. The cable provides a dense array that helps us separate source and wave propagation effects for different purposes. Here, I use cables in wells in geothermal reservoirs and a telecom cable on the MIT campus. The applications …
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Suppression of disorder-induced scattering in optomechanical systems
High-Q optical and mechanical resonators have been utilized in ultra-high precision metrology, transducers, sensor applications, and even investigating quantum mechanics at mesoscales. However, these low-loss devices are often limited by sub-wavelength fluctuations within the host material, that …
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Structural Health Monitoring and Seismic Response Assessment of Civil Infrastructure using Target-Tracking Digital Image Correlation
… the capabilities and limitations of wireless typesensors. However, there have been issues in data transmission, limited measurementdistance, or limited measurement points. To cope with the problems of existing wirelesssensor, vision-based measurement systems have been developed and they are …
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Evaluating the Electrical Response of Polyaniline to Mechanical Strain
… or insulating electrical properties. Resilient mechanical properties, good processability, and low cost make conducting polymers good candidates for applications traditionally held by metals and semi-conductors. When tensile strain is applied to polyaniline in an electrolyte solution, the …