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 9 of 9 for “"piezoresistance"”.
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Silicon piezoresistors for MEMS pressure sensor applications
… software, COMSOL is employed to simulate the piezoresistance effect in />-type silicon for a range of doping concentrations. Simulation v results demonstrate a similar trend to experimental results and publication data and show that the piezoresistance effect decreases as the doping …
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Impact of uniaxial strain on P-channel 111-V quantum-well field effect transistors
… by these two effects. For the first time, the piezoresistance coefficients for the three pchannel QWs were determined. A significant finding was that the combination of uniaxial strain with epitaxial biaxial strain appears to enhance the hole mobility in a superlinear way. With high …
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Mechanical relaxations, spin glasses and 1/f resistance noise
… The first is measurements of the anelastic piezoresistance in thin films of bismuth, niobium and iron to demonstrate a connection between mechanical anelastic relaxations and electrical 1/f noise from the motion of defects. We have found that the connection between 1/f noise and mechanical …
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Mechanical relaxations, spin glasses and 1/f resistance noise
… The first is measurements of the anelastic piezoresistance in thin films of bismuth, niobium and iron to demonstrate a connection between mechanical anelastic relaxations and electrical 1/f noise from the motion of defects. We have found that the connection between 1/f noise and mechanical …
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Thermally-actuated piezoresistively-sensed mechanical silicon oscillator
… in an n-doped Si wafer, show large negative piezoresistance coefficients. Beyond significant threshold DC current densities (GA/m 2 ), the thermal-actuation and piezoresitive-feedback loop excite the mechanical structure, causing spontaneous oscillations. We begin with the investigation of …
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Design of Piezoresistive MEMS Force and Displacement Sensors
… data also illustrated the failure of existing piezoresistance models to accurately account for bending and combined loads. Two MEMS force and displacement sensors, the integral piezoresistive micro-Force And Displacement Sensor (FADS) and Closed-LOop sensor (CLOO-FADS), were designed and …
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Smart material composites for magnetic field and force sensors
Piezoelectric material based sensors are widely used in applications such as automobiles, aircraft, and industrial systems. In past decade, attention has been focused on synthesizing composites that can provide multifunctional properties, i.e., same material exhibits two or more properties. In this …
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Multi-physics Modeling and Calibration for Self-sensing of Thermomechanical In-plane Microactuators
As technology advances and engineering capabilities improve, more research has focused on microscopic possibilities. Microelectromechanical systems (MEMS) is one area that has received much attention recently. Within MEMS much research has focused on sensing and actuation. This thesis presents work …
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Mechanical stress and stress compensation in Hall sensors
Silicon magnetic sensors based on the Hall effect have proven to be an excellent sensor choice for many applications, such as position sensing, gear-tooth sensing, contact-less switching and linear sensing. Although a sensor can be trimmed over temperature before it is shipped to the customer, …