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 20 of 20 for “"Mechanical Waves"”.
-
Estimation of Adhesive Bond Strength in Laminated Safety Glass Using Guided Mechanical Waves
Based upon the guided wave energy velocity predictions for each of the laminates with different levels of adhesion, the S0 mode was selected as the most promising for use in nondestructively estimating adhesion levels in laminated safety glass. The predicted energy velocities (obtained using this …
-
Nondestructive evaluation of material properties using physics-informed neural networks and mechanical waves
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-05-01
-
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 …
-
Monitoring Corrosion of Rebar Embedded in Mortar Using Guided Ultrasonic Waves
… corrosion in reinforced concrete, and guided mechanical waves have also been presented.
-
Acoustic Radiation Force Impulse-Driven Shear Wave Velocimetry in Cardiac Tissue
… have been used to generated transverse-traveling mechanical waves in various biological tissues. The velocity of these waves is related to a medium's stiffness and thus can offer useful diagnostic information. Consequently, shear wave velocimetry has the potential to investigate cardiac disease …
-
A Study on Steady State Traveling Waves in Strings and Rods
… main focus of this present work is to study how mechanical steady state traveling waves can be generated and propagated through one dimensional media by applying forces. By steady state traveling waves we refer to propagating mechanical waves in a finite medium that never exhibit reflections at …
-
Three dimensional simulation of ultrasonic cleaning vessels and verification of results
Ultrasonics, that is mechanical waves with a frequency greater that 18 kHz. are employed in a number of diverse and distinctive industries. One important niche occupied by ultrasound, and the focus of this thesis, is its application in ultrasonic cleaning systems whereby the rapid pulsing of …
-
Design and fabrication of granular materials for surface acoustic waves
… can lead to novel propagation behaviors of mechanical waves. Acoustic studies of granular media typically involve macroscopic particles whereas contact-based vibrations of microparticles remain largely unexplored. The adhesion which can be neglected on millimeter scale is significant on …
-
INSIGHTS INTO ERUPTION DYNAMICS AND SHALLOW PLUMBING SYSTEM OF MT. ETNA BY INFRASOUND AND SEISMIC SIGNALS
… thus, beside seismic signal, acoustic waves mainly in the range of infrasound are generated. In particular, infrasound activity is usually evidence of open conduit conditions and its quantification can provide information on explosive phenomena and source mechanism. A more comprehensive …
-
Magnetomotive dynamics of magnetic particles for optical imaging contrast and elastography
… response were investigated for probing the mechanical properties of both homogeneous and heterogeneous samples. The feasibility of generating elastograms showing relative mechanical contrast based on the frequency response of the MM-signal was investigated. In addition, quantitative …
-
Optical coherence vibrography : a quantitative tool for probing auditory and ocular biomechanics
Mechanical properties of biological tissues are inherently tied to their function. As such, they can provide direct insight into the structure and integrity of organs, and how they are affected by physiological and pathological processes. Optical coherence tomography (OCT) is a powerful imaging …
-
Light localization in biological media
… interference is ignored. If scattered waves return to their origin points along the time-reversed paths for constructive interference, outgoing waves can be forbidden, occasionally being on-resonance or off-resonance with Anderson localized modes. However, such a phenomenon in optics …
-
Acoustic Metamaterials at the Microscale
… materials allow for tunability of extreme static mechanical properties such as stiffness, Poisson’s ratio, or strength. However, dynamic and acoustic properties of micro-architected materials remain largely unexplored, partially because it is challenging to measure their response at these scales. …
-
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 …
-
Cell Mechanics: From Cytoskeletal Dynamics to Tissue-Scale Mechanical Phenomena
… intracellular activity to capture the emergent mechanical behavior of cells. The topics covered in this dissertation fall into three broad categories : (a) intracellular mechanics, (b) interaction of cells with the extracellular matrix and (c) collective mechanics of multicellular colonies. In …
-
Development of Electronic Systems for Ultrasonic Particle Manipulation
… and particle trapping and manipulation with mechanical waves generated from ultrasound sources, known as “acoustic tweezing”, has gained great interest by researchers and been proved useful for its unique advantages. With an analogy to optical tweezing, research has demonstrated the …
-
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 …
-
Shear Wave Elastography Based on Optical Coherence Tomography
Mechanical properties of biological tissue are involved in a wide range of modern advances of medical science and technology. The mechanical property of biological tissue is directly related to the functionalities of tissue or organ, hence the in-depth knowledge of tissue mechanical property could …
-
Directed Cell Migration: From Single Cells to Collectively Moving Cell Groups
… nanotopographic elements. I show that mechanical waves of actin polymerization are involved in this guidance–known as contact guidance–as dynamic sensors of surface nanotopography. The dynamics of guided actin waves were measured to build and test predictive models of …
-
Numerical Simulation of Adiabatic Shear Bands and Crack Propagation in Thermoviscoplastic Materials
… by a hyperbolic heat equation; thus thermal and mechanical waves propagate with finite speeds. The formation and propagation of an adiabatic shear band (ASB) inplane strain tensile deformations is studied for eleven materials. The ASB is assumed to form when the maximum shear stress has been …