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 32 for “"fiber alignment"”.
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Determination of the Mechanical Properties of Electrospun Gelatin Based on Polymer Concentration and Fiber Alignment
… scaffolds, including how factors such as fiber diameter and porosity are affected by polymer concentration. However, the affects of fiber alignment upon the material properties of electrospun scaffolds remains unclear. The purpose of this study is to determine how the material properties …
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Effects of collagen content, fiber alignment, storage and heating on cooking characteristics, dimensional changes and microstructure of restructured beef
… to determine the effects of collagen level, fiber alignment, frozen storage and oven temperature on cooking characteristics and the dimensional and structural changes of restructured beef steaks. Three replicates of high (HC) and low collagen (LC) raw materials similar in proximate …
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Characterizing the Shear Behavior of Ultra-High-Performance Concrete through the Universal Panel Tester
… combined stress states and the influence of fiber alignment are yet to be characterized. This dissertation presents experimental and analytical investigations on the shear behavior of UHPC, considering axial load, size, and fiber alignment effects. The experimental program consists of three …
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Enhancing the mechanical properties of a hydroxyapatite-collagen bone surrogate
… on the organized array of mineralized collagen fibers that align with applied physiologic stresses. The apatitic calcium phosphate phase, hydroxyapatite, is promising for the biomimetic mineralization of collagen. Hydroxyapatite-collagen composites are osteoconductive and resorbable. However, …
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Electrospun Scaffolds for Cartilage Tissue Engineering: Methods to Affect Anisotropy, Material and Cellular Infiltration
… field. We improved the quantification of fiber alignment, discovering that surface fibers in isotropic scaffolds show similar amounts of fiber alignment as some types of anisotropic scaffolds, and that cells align themselves in response to this subtle fiber alignment. We improved previous …
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Equine superficial digital flexor tendon evaluation using low field magnetic resonance imaging and ultrasonography
… content, proteoglycan content, and collagen fiber alignment) was performed at the same time points. At four weeks following collagenase injury, the area of maximal injury assessed on cross-section was similar between ultrasonographic and MR imaging. In older lesions, ultrasonography …
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Development and Characterization of Tunable, Bioinspired Electrospun Constructs for Skeletal Muscle Engineering
… polymer was electrospun with varying degrees of fiber alignment and varying degrees of crosslinking. The impact of scaffold architecture and crosslinking density on fiber swelling, degradation kinetics, and mechanical properties was then evaluated. After confirming that the material properties of …
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Effect of Electrospun Mesh Diameter, Mesh Alignment, and Mechanical Stretch on Bone Marrow Stromal Cells for Ligament Tissue Engineering
… (ester-urethane urea) (PEUUR) with different fiber diameters degrees of fiber alignments — were biocompatible and supported cell growth. Topographic cues guided cell alignment, and cell elongation increased with increasing fiber alignment. Finally, expression of the ligament-like markers …
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Complementary Strategies to Promote Mesenchymal Stem Cell Differentiation for Ligament Tissue Engineering
… poly(esterurethane urea) with variations in fiber diameter and fiber alignment. Primary mesenchymal stem cells and the mesenchymal stem cell line, C3H10T1/2, were seeded on these scaffolds and assumed spindle-shaped morphologies and oriented with the direction of fiber alignment. Fiber …
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Precision Self -Alignment Techniques for Optoelectronic Integration
… used for the integration and precise self-alignment of optoelectronic components are presented. State-of-the-art self-alignment accuracies have been achieved using solder bump arrays for component alignment and etched V-grooves for optical fiber alignment. The self-alignment potential of …
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Texturization of soy protein via twin-screw extrusion
… extrudates and the degree and order of protein fiber alignment. Differential scanning calorimetry was used to investigate the influence of texture modifiers and protein cross-linking agents on the denaturation behavior of 7S and 11S globulins. Protein solubility in different chemical reagents …
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Mapping crossing myofiber populations with Diffusion Spectrum Imaging in simulated and microfabricated model tissues
The ability to resolve complex myofiber populations is important for relating architectural structure with mechanical unction in muscular tissues. To address this issue, we sought to validate the capacity of Diffusion Spectrum Imaging (DSI), an MRI method for assessing molecular diffusion in a …
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Performance and Design of Extruded Fiber-Reinforced Mortar with Preferentially Aligned Fibers
… investigation into the mechanical properties of fiber-reinforced concrete (FRC), focusing on fracture and flexural toughness properties, the impact of fiber orientation and distribution, and the evaluation of flexural models for predicting the behavior of functionally graded FRC. It embarks on a …
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Using simulation to estimate probability density functions of bound water molecules with DSI
… diffusion imaging derives information about fiber alignment and diameter, we simulated a model diffusion experiment employing a random walk paradigm. A simulation of a model diffusion spectrum imaging experiment was written in Java in order to compare the diffusive behavior of particles in a …
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Complex muscle architecture described with diffusion weighted MRI
The complex array of fiber orientations exhibited by muscles such as the tongue, esophagus, and heart, enable function beyond basic pulling. Among other things, the presence of crossing geometry adds the ability to push by bi-directional contraction causing expansion in the orthogonal direction. …
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Fiber Orientation Effects on the Fracture and Flexural Toughness of Extruded Fiber Reinforced Concrete for Additive Manufacturing
In this study, the mechanical properties of a fiber-reinforced cementitious composite (FRCC) were derived for specimens fabricated using two different methods of casting: conventional cast construction and pump-driven extrusion. Through the extrusion process, fibers are more likely to be oriented …
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Multi-scale analysis of cardiac myoarchitecture
… (TPM) was used. DSI is a technique that derives fiber orientation from directionality of proton diffusion, whereas TPM derives cellular alignment from an autocorrelation of 3D resolved images of cells and subcellular structure. Mesoscale tract representations of myofiber orientation are generated …
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Relative potency and duration of analgesia following palmar digital intra-neural alcohol injection for heel pain in horses
… evaluation showed preservation of nerve fiber alignment with an intact epineurium, loss of axons (axon drop out), axon degeneration, fibrosis and inflammation in alcohol- and formaldehyde-injected nerves compared to control nerves. Formaldehyde injection induced greater fibrosis and …
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Novel Apparatus to Control Electrospinning Fiber Orientation for the Production of Tissue Engineering Scaffolds
… jet axis for repeatable scaffold production. Fiber alignment and scaffold density are precisely controlled by rotating a mandrel along one axis, translation along that same axis, and rotation around the second axis perpendicular to the electrospun fiber stream. The control is accomplished with …
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Identification of quantitative second-harmonic generation imaging metrics for collagenous tissue
… SHG imaging (FT-SHG) to measure the collagen fiber orientation quantitatively. Recently, I expanded this approach by adapting new parameters on two-dimensional (2D) images and significantly broadening the three-dimensional (3D) analysis of 3D-SHG images. Ultimately, these parameters such as …
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