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 18 of 18 for “"defect size"”.
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Vibration signatures of defective bearings and defect size estimation methods
… of this research is on the fault detection and defect size estimations of ball and cylindrical rolling element bearings with outer race defects. In classic bearing vibration condition monitoring methods, the trend of vibration amplitudes is often used to determine when a bearing should be …
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Myocardial Perfusion Imaging With Rb-82 PET
… area of the myocardium is defined as defect. 99mTc agents, 18F-FDG, and 82Rb can all be used for cardiac imaging 1-7. However, count rates, energy and camera differences can yield image differences that are independent of the actual biological distribution. We examined whether PET with …
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KERATIN BIOMATERIAL SCAFFOLDS FOR PERIPHERAL NERVE REGENERATION
… currently recommended for the repair of small defects (≤ 3cm) in small diameter sensory nerves only. Use of filler materials inside the conduit have been shown to increase the defect size in which conduits can be effective and can result in greater functional recovery in animal models.
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Healing of defects in a two-dimensional granular crystal
… of the self-healing properties of circular grain defects with an emphasis on defect orientation. A circular grain defect is introduced into a nearly perfect hexagonal array of millimeter-sized spherical brass particles enclosed in a square tray. The array is oscillated uniaxially, causing the …
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Irradiation-Induced Microstructural Evolution and Mechanical Properties in Iron With and Without Helium
… the quantitative evaluation of the ex-situ TEM defect analyses and the relationship of nanohardness to yield strength. The microstructural results from KMC modeling were also related to the mechanical properties through the Dispersed Barrier Model. (2) KMC was identified as a complementary …
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In vitro and in vivo assessments of PCL-TCP composites for bone tissue engineering
… result in donor site morbidity and is limited by defect size. Allografts and xenografts are not as popular due to the increased risk of disease transmission, high cost and graft rejection. Shortcomings of current bone grafts motivate researchers to look into polymer composites for better …
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Detection of defects in FRP-reinforced concrete with the acoustic-laser vibrometry method
… popular for civil infrastructure systems. When defects occur in FRP-reinforced concrete elements at the FRP-concrete interface, such as voids or delamination, FRP obscures the defect such that visual detection may not be possible. Most currently available non-destructive testing (NDT) methods …
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Positron annihilation spectroscopy to understand defect formation and evolution in neutron-irradiated Fe-Cr model alloys
… technique used to characterize the defect properties of materials. There are two major types of PAS, positron annihilation lifetime spectroscopy and Doppler broadening spectroscopy (DBS). This work focused on the latter. DBS can be used to gain information on the various types of …
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INTELLIGENT NON-DESTRUCTIVE EVALUATION EXPERT SYSTEM FOR CARBON-CARBON COMPOSITES USING THERMOGRAPHY, ULTRASONICS, AND COMPUTED TOMOGRAPHY
… the best possible diagnosis of the potential defects and problems. As a result, this research help ensure C/C composites' integrity and reliability. Four types of orthotropic aerospace composite material groups, which include 2-D pitched based commercial aircraft disc brakes and asmolds, 3-D …
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Impedance-based Nondestructive Evaluation for Additive Manufacturing
… and permitting the introduction of internal defects that are not present in the feedstock, respectively. NDE approaches that are capable of surmounting these challenges are typically highly expensive. In the first portion of this work, the procedure for impedance-based NDE is examined in the …
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Sensitivity and Accuracy of Cone Beam Computed Tomography in Diagnosing Osseous Defects at the Mandibular Condyle
… tomography (CBCT) to diagnose small osseous defects at the mandibular condyle, this study investigated: 1) the impact of defect size and CBCT scan resolutions on the accuracy of qualitative and quantitative diagnoses of condylar defects and, 2) the ability to determine a suspected defect to …
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Acute Myocardial Infarction: The Relationship between Duration of Ischaemia and Infarct Size in Humans - Assessment by MRI and SPECT
… effect of duration of ischaemia on final infarct size is well established in animal studies, but not fully evaluated in humans. Delayed contrast-enhanced magnetic resonance imaging (DE-MRI) can be used to distinguish between viable and non-viable myocardium and thus to quantify infarct size. We …
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Determination of the Leak Size Critical to Package Sterility Maintenance
… review; the mechanism by which a package defect becomes a leak; and the imposed pressures generated within a package during distribution; comparison of the threshold leak size to the critical leak size and their effect on loss of package sterility; and the relationships between …
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Quantifying uncertainty in pathogen removal, membrane integrity monitoring and health consequences in the treatment of drinking water
… related to the contact angle may result in defect size resolution that is greater than 3 micrometers. This implies that the test is not always compliant with Environmental Protection Agency requirements established to detect defects large enough to allow the passage of oocysts of …
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Assessment of Injection Behavior of Commercially-available Bone BSMS for Subchondroplasty Procedures
… materials (BSMs) or bone cement to correct bone defects in the subchondral bone. The two main materials used to compose BSMs are poly-methyl-methacrylate (PMMA) and calcium phosphate cement (CaP). Currently, there is no optimal bone material substitute in the market that can provide both the …
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Computational analysis of thermodynamic and mechanical properties of nano-materials
… as quantum effects, surface effects, material defects become significant. Classical theories and bulk material properties based on the continuum assumption may not be directly applicable for nanoscale devices. Accurate and efficient computational models and systematic study of material …
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An investigation into the potential of advanced sensor technology to support the maintenance of pipeline distribution systems
… of piezoelectric elements in pipeline defect (crack) signature detection to predict changes in component performance with data sets derived experimentally using laboratory bench testing. Vibration sound-emission detection techniques performed on various oil steel-pipeline defects, using …
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Lebensqualität und Gelenkfunktion nach Knorpel-Knochen-Transplantation
Ziel war die Ermittlung des klinischen Therapieeffektes der Knorpel-Knochen Transplantation. Mit der Hypothese, dass durchschnittlich 7 Jahre postoperativ eine signifikante Verbesserung von (1) Lebensqualität, (2) Gelenkfunktion und (3) Knorpelstruktur vorliegt (p<0,05), wurde der Einfluss von …