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.
Results
Showing 1 to 9 of 9 for “"resonant frequency shift"”.
-
The resonant-frequency shift of a microwave cavity caused by the high-density plasma in semiconductors, as a function of magnetic field
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Physics, 1959
-
Simulation of Electromagnetic Effects in Magnetic Resonance Imaging
… information inside the human head, the RF coil's resonant frequency shift due to the biological loading and the SNR of RF surface coils are also investigated in this thesis. It is expected that the EM solver can be combined with the heat transform equation to simulate the heating pattern inside …
-
Resonance Tracking and Vibration Stabilisation of Ultrasonic Surgical Instruments
… and the load result in variations in resonant frequency and electric impedance, which negatively affect the performance of the ultrasonic surgical instrument. The aim of this work was to develop an adaptive driving system to address the issue of the resonant frequency shift and …
-
Nanostructured materials for photovoltaics and microwave electronics: methods and applications
… materials for “low-cost” photovoltaics and high frequency (microwaves) analog electronics. Indeed, the two areas investigated demonstrate the enormous potential for diverse applications of nanostructured materials. The initial research stage focused on the optimization of titanium dioxide …
-
Detection of mass, growth rate, and stiffness of single breast cancer cells using micromechanical sensors
… MEMS devices for mass sensing through resonant frequency shift. Measuring the dependency of growth rate on cellular mass may help explain the coordination and regulation of the cell cycle. However, MEMS mass sensing devices still require further development and characterization in order …
-
Developing a Self-Powered, Wireless Damage Detection System for Structural Health Monitoring Applications
… performing impedance-based testing and detecting shifts in resonant frequencies. This independent structural health monitoring system incorporates a low power wireless transmitter that sends a warning signal when damage is detected in a structure. Two damage detection techniques were implemented …
-
Design and Implementation of Mode Localised Resonant MEMS Oscillators for Gravimetric Sensing
… have been proposed as an alternative to resonant frequency MEMS sensors due to their increased sensitivity and first-order common-mode rejection to variations in temperature. This thesis presents a number of contributions to the design of coupled MEMS resonators for sensing ultra-fine …
-
Towards Ultra-High Resolution Mode-localised MEMS Sensors
… been increasingly viewed as an alternative to resonant frequency shift based sensing. Much theory has been proposed highlighting the advantages of these sensors including the increased sensitivity and the promise of common mode rejection to first order environmental variations. This has led to …
-
Anharmonic Acoustic Technique for Detection of Surface-bound Particles
… with direct direction techniques, such as the resonant frequency shift based detection using quartz crystal microbalance (QCM) or micro-cantilevers, which involve minimal sample processing and washing steps. The work presented in this thesis investigates, through modeling and experiments, the …