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 11 of 11 for “"mechanical wave"”.
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Electrical analogs for plate equations and their applications in mechanical vibration suppression by P.Z.T. actuators
… equations of which were analogous to the ones of mechanical systems. The mentioned circuits were called ectro-mechanical analogs. They were used as analogical computers for the simulation and the design of mechanical systems. The actual technological development of piezoelectric actuators, which …
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Continual Traveling waves in Finite Structures: Theory, Simulations, and Experiments
A mechanical wave is generated as a result of an external force interacting with the well-defined medium and it propagates through that medium transferring energy from one location to another. The ability to generate and control the motion of the mechanical waves through the finite medium opens up …
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Effects of geometry on static and band gap properties of 3D printed metastructures
… geometry allow for these materials to manipulate mechanical wave propagation, producing band gaps at certain frequency ranges. The enhanced static and vibration properties of architected metamaterials make them ideal candidates for multi-functional purposes. In this paper, we take inspiration from …
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Electron Scattering From a High Momentum Neutron in Deuterium
… of the system is described by a quantum-mechanical wave function and the state of the nucleons at a given time is not known a priori. However, by detecting a backward going proton of moderate momentum in coincidence with a reaction taking place on the neutron in deuterium, the initial …
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Low-dimensional electron transport and surface acoustic waves in GaAs and ZnO heterostructures
A surface acoustic wave (SAW) is a combination of a mechanical wave and a potential wave propagating on the surface of a piezoelectric substrate at the speed of sound. Such waves are widely applied in not only the communication industry, but also in quantum physics research, such as …
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Damage assessment in reinforced concrete using contactless ultrasound
… finite element method (FEM or FE) simulations of mechanical wave-based NDE methods are developed and described in order to support the system construction, theory verification, and experimental work. The FE models simulate generation and detection of air-coupled transient waves in air and wave …
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Noninvasive Neuromodulation via Ultrasonic Activation of Endogenous and Exogenous Ion Channels
… predominately rely on electromagnetic waves. However, the fundamental physical law the tradeoff-relationship between penetration and spatial resolution, limits their transcranial penetration within the superficial cortex layer. To overcome this challenge, electrodes or optical fibers …
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Probabilistic impact-echo method for nondestructive detection of defects around steel reinforcing bars in reinforced concrete
Accurate assessment of engineered infrastructure using nondestructive testing (NDT) is critical to the proper scheduling of the maintenance and/or replacement of infrastructure components. In reinforced concrete structures, potentially adverse changes in the bond between concrete and reinforcing …
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Laser-control of molecular dynamics
… be used for directing (or controlling) quantum mechanical wave packet motion. The efficiency of the instantaneous dynamics algorithm was demonstrated in treating various model problems, the population transfer in double well potentials, excitation and dissociation of selective modes, and the …
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Advancing Transcranial Focused Ultrasound for Noninvasive Neuromodulation of Human Cortex
Ultrasound waves are mechanical undulations above the threshold for human hearing, and have been used widely in both the human body and brain for diagnostic and therapeutic purposes. Ultrasound can be controlled using specially designed transducers into a focus of a few millimeters in diameter. Low …
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Clinical Translation of Dynamic OCE for Corneal Biomechanical Assessment
Purpose: Determining corneal mechanical properties is required for understanding and diagnosing corneal shape changes caused by ocular disease, degeneration, or refractive surgery, yet remains a long-standing challenge. This dissertation aims to clinically translate dynamic optical coherence …