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 20 of 259 for “"viscoelasticity"”.
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Ultrasonic viscoelasticity imaging of nonpalpable breast lesions
The prognosis of breast cancer patients improves with early and accurate diagnosis. The quality of the strain image produced by displacement estimation algorithms are heavily influenced by the RF echo data recorded by different ultrasound systems. A small clinical study was conducted with 21 women …
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Cure induced stress generation and viscoelasticity in polymer coatings.
… coatings and to model stress generation and viscoelasticity seen during curing. Two new mathematical models were created to accomplish viscoelastic stress modeling. The first, a network model, uses a two-dimensional network of one-dimensional elements to replicate deformation in the coating. …
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Ion transport and viscoelasticity of dynamic polymer network electrolytes
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2023-12-01
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Viscoelasticity of vitrimers: tunability and applications of dynamic networks
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Miniature Fiber Optic Viscoelasticity Sensor for Composite Cure Monitoring
… output quantitative data which will indicate the viscoelasticity of the thermoset matrix resin. The same sensor will additionally function as a strain sensor following fabrication, capable of monitoring residual strains due to manufacturing or in-service internal strains.
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Viscoelasticity of Articular Cartilage and Ligament: Constitutive Modeling and Experiments
… of articular cartilage, besides the fluid-driven viscoelasticity.
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Tunable viscoelasticity, morphology, and charge transport of dynamic covalent polymers
… crosslinking density and salt concentration on viscoelasticity, salt coordination, and ionic conductivity in vinylogous urethane (VU) vitrimers was systematically studied. Salt-containing vitrimers showed faster relaxation behavior compared to salt-free vitrimers due to the catalytic effects of …
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Role of right ventricular anisotropic viscoelasticity in pathophysiology of RV failure
… investigated. Understanding of the impact of RV viscoelasticity in RV performance will fill a key knowledge gap in RV pathophysiology. Furthermore, the microtubule (MT), a cytoskeletal component of the cardiomyocyte (CM), is known to significantly contribute to the pathophysiology of multiple …
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Non-maximum entropy polymer elasticity, viscoelasticity and the lattice Boltzmann method
Various models of viscoelasticity exist based on continuum mechanics. In this work a statistical mechanical approach is taken to derive a new isotropic, hyperelastic, viscoelastic, incompressible constitutive equation for polymers. The result has been achieved by generating a novel physics for the …
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Changes in the clotting viscoelasticity caused by cardiopulmonary bypass (CPB) surgery
… In this study, we used the TVE test to assess viscoelasticity of clotting blood from patients before and after CPB. For each patient and condition, we tested the blood alone and after incubation with a saturation concentration of ReoProTM, a glycoprotein Ilb/Illa inhibitor. The major findings …
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Transient moisture effects on the viscoelasticity of synthetic fibers and composites
Transient moisture conditions can accelerate the viscoelastic behavior of certain materials over that of constant moisture conditions. This is termed the mechano-sorptive phenomenon. The thrust of this research effort is to study the mechano-sorptive effects on the creep behavior of synthetic …
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Analysis and modeling of inelasticity in tendon: viscoelasticity, damage, and plastic deformation
… in tendon, which can be categorized into viscoelasticity, damage, and plastic deformation, and study their underlying mechanisms by using state-of-the-art mechanical testing, constitutive modeling, and micro-structural imaging. I addressed this general objective through four specific aims: …
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Aero-servo-viscoelasticity theory: lifting surfaces, plates, velocity transients, flutter, and instability
… The first is a change from elasticity to viscoelasticity to more accurately capture the solid mechanics of the composite material. The second change is to include control systems. While the inclusion of control systems in aeroelasticity lead to aero-servo-elasticity, more control …
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The role of tissue viscoelasticity in axon guidance during Xenopus brain development
… time-dependent mechanical properties known as viscoelasticity. In this project, I developed a method based on atomic force microscopy (AFM) to measure the viscoelasticity of biological tissues (in vivo Xenopus brain and ex vivo rodent spinal cord tissue). To investigate the influence of …
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Ultrasonic Methods to Measure Shear Wave Velocity and Absorption for Tissue Viscoelasticity Characterization
Characterization of the viscoelasticity for soft tissues is useful for medical diagnosis. Various ultrasound and magnetic resonance-based techniques have been developed over the past few decades. With ultrasound methods, generating and tracing a shear wave (SW) propagating within the soft tissue …
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Theory of slow coupled translational-rotational dynamics and viscoelasticity of nonspherical particle suspensions
… The first microscopic theory of the nonlinear viscoelasticity of dense fluids of nonspherical particles is presented. It provides a first principles explanation of the striking two-step yielding phenomenon experimentally observed in very concentrated low aspect ratio hard dicolloid suspensions. …
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The role of hydrodynamic interactions in the dynamics and viscoelasticity of actin networks
… can be defined consistent with (intrinsic) viscoelasticity. However, axial loss modulus follows a quadratic system-size dependency consistent with poroelasticity. Our results suggest that including HIs is critical for consistency in theoretical models or analyzing experimental observation in …
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Mechanics of living cells: nonlinear viscoelasticity of single fibroblasts and shape instabilities in axons
Biomechanics is a field of major biological relevance. In spite of the vast complexity of biological matter, a number of generic features are found to hold in the mechanics of soft tissues throughout all of its length scales. A major goal in biomechanics is to reduce its general features to those …
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Resonating Fluidic Circuits: A Novel Technology to Create a Portable Blood Viscoelasticity Measuring Device
… diagnose coagulopathy by measuring blood clot viscoelasticity are portable, meaning that coagulopathy can only be diagnosed inside a well-resourced hospital. Resonating fluidic circuits are a promising technology to address this clinical need. In addition to being small enough to fit into a …
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