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 7 of 7 for “"acoustic nonlinearity"”.
-
Ultrasonic reflection mode imaging of the acoustic nonlinearity parameter
The problem of mathematically modeling the nonlinear interaction of ultrasound beams is addressed. The counterpropagation model is studied and a new model, called the copropagation reflection model, is proposed. The new model shows that the copropagation of the probe and the reflected pump leads to …
-
Influences of biological structural features on the acoustic nonlinearity parameter B/A
… of structural factors of biological media on the acoustic nonlinearity parameter B/A were studied at tissue, cellular and molecular levels, using both the thermodynamic method and the finite amplitude method. Experiments were designed to measure the B/A changes by altering structural factors of …
-
Continuous wave mode locking for the determination of the acoustic nonlinearity parameter B/A
The acoustic nonlinearity parameter B/A of the nonlinearity of the equation of state for a fluid. Its significance can be found in numerous fields including shockwaves, bio-chemistry and medicine. Recent studies in the field of biomedical ultrasound have necessitated a simple and accurate means of …
-
Design of a low pressure system to determine the acoustic nonlinearity parameter B/A for small volumes of sample liquids
This thesis aimed to design a measurement system to obtain B/A readings for different liquids using the isentropic phase method. The resulting system uses a sinusoidal wave source that operates on less than 20kPa to pressurize a sample liquid of less than 0.2 ml. The advantage of the system is that …
-
Dynamics of Multi-functional Acoustic Holograms in Contactless Ultrasonic Energy Transfer Systems
… is based on transferring energy using acoustic waves, in which the waves are generated by an acoustic source or transmitter and then transferred through an acoustic medium such as water or human tissue to a sensor or receiver. The receiver then converts the mechanical strain induced by …
-
Dynamics of smart materials in high intensity focused ultrasound field
… challenge of low efficiency by focusing the acoustic energy on piezoelectric receivers to transfer power wirelessly. The fundamental physics underlying these two concepts is explored by developing comprehensive mathematical models that provide an in-depth analysis of individual parameters …
-
Elastic wave tailoring at the macro/micro/nano- scales using intentional strongly nonlinear coupling
In acoustics, wave tailoring refers to the manipulation of the propagation of waves or energy that are generated due to some form of dynamic loading. It includes real world examples ranging from impact mitigation to sensors and communication applications and is typically accomplished through the …