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 64 for “"mechanical failure"”.
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Mechanical failure of lithium-ion batteries
The commercialization of lithium-ion batteries has accelerated the electrification process of vehicles. In the past decade, one could see great advances in the life span, cost, performance, specific energy, and specific power of batteries. At the same time, the safety of batteries has not been …
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Development of a low-cost high-impact resistant compliant myoelectric prosthetic hand
Repeated mechanical failure due to accidental impact and lack of sensory feedback are one of the main reasons why people with upper-limb amputations abandon commercially-available prosthetic hands. To address this problem, this thesis presents the design and evaluation of a compliant four-bar …
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Substrate-mediated modulations of graphene’s electronic properties
… can dramatically alter its electrical and mechanical properties. In this thesis we investigate the interactions between graphene and three distinct types of substrate. First we consider graphene on flexible substrates and the interaction between the strain induced by the substrate and …
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Molecular dynamics simulation of mechanical behavior of nanoporous copper foams
Metallic foams have a variety of unique mechanical properties that make them prime candidates for many different applications. Recent developments in manufacturing have allowed for the creation of nanoporous foams but still relatively little is known about foam behavior on the nano-scale. To …
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Novel Magnet Structures for Mechanically Robust Linear Motors
… life can be exceeded, potentially leading to a mechanical failure. This poses a serious problem to the growth of the machine tool industry. Interior permanent-magnet (IPM) motors, found in nearly every electric car, offer an interesting approach to solve this problem. In an IPM motor, the …
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Using orthogonal arrays to train artificial neural networks.
… dangerous system (for example, suffering a mechanical failure) needs to be controlled quickly. Previous work on the methods has shown that they suffer problems when used with multi-layer networks. The thesis discusses the reasons for these problems and reports on several successful …
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Fabrication and corrosion assessment of biodegradable metallic alloys for patient-specific bone implant applications
… which can lead to loss of bone density, mechanical failure of the implant, and require corrective surgery. Biodegradable orthopedic implants offer strength and stiffness close to that of bone, prevent the need for corrective surgery, and eliminate the long-term existence of a foreign …
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Stress evolution of thin film RuO₂ Li-ion battery electrodes
… better understand the mechanisms that underlie mechanical failure in RuO₂, we perform the first in situ measurement of mechanical stress evolution in thin film RuO₂ electrodes. The results of these measurement reveal a very unique stress evolution pattern in RuO₂, which has not been observed or …
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Extracellular Matrix Degradation and Mechanical Integrity of Degenerated Human Annulus Fibrosus from Surgical Specimens
… biochemical matrix degradation and functional mechanical failure of the annulus fibrosus (AF) remains poorly defined in human tissue. The interlamellar matrix (ILM), which binds adjacent collagen lamellae via cross-bridges, is a key determinant of AF mechanical integrity, but whether its …
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Development of a test facility to evaluate hot gas filtration characteristics of a candle filter
… filtering, contributing to a possible cause of mechanical failure of the filter.;A High Temperature Test facility (HTTF) was built to investigate the ash characteristics during surface regeneration at high temperatures. The system was capable of conducting surface regeneration tests of a single …
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The microstructure, mechanical and superconducting properties of (RE)BCO bulk single grains
… Eu, Sm or Nd] show a wide variability in their mechanical and magnetic flux trapping properties. These variations attribute primarily to variations in the microstructure of (RE)BCO bulk materials. While the influence of secondary (RE)<sub>2</sub> BaCuO<sub>5</sub> (RE-211) particles has been …
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Using finite element models under multiple loading conditions to improve the association between radius and tibia microarchitecture and prevalent osteoporotic vertebral fracture
… and healthy controls. As fracture is a result of mechanical failure, FE models of these sites in physiologically relevant loading conditions (compression, torsion, bending) may reveal insight into fracture pathogenesis uncaptured by microarchitecture. In this study, HR-pQCT scans at the tibia and …
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Relationship of Mechanical Deformations and Electrochemical Properties of Lithium Ion Batteries-An Experimental Study
… computation model that can predict the impact of mechanical deformations on electrochemical properties of lithium-ion batteries. Experiments were conducted on two different types of lithium-ion battery cells in order to continue gathering data to refine and validate the ICL model. First, prismatic …
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Lumped Parameter Model for a Self Powered Fontan Palliation of the Hypoplastic Left Heart Syndrome
… pumps also present some complications due to mechanical failure, risk of stroke, and risk of infection [23-30]. The purpose of this study is to numerically simulate the hemodynamics of a self-powered Fontan circulation aided by the reserve ventricular energy captured by the entrainment effect …
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Novel Design Solutions for High Reliability RF MEMS Switches
… of Radio-Frequency (RF) Micro-Electro-Mechanical System (MEMS) switches for space applications. The work was inspired and supported by the European Space Agency (ESA) Contract No. ITT AO/1-5288/06/NL/GLC ?High Reliability Redundancy Switch?. The main purpose of the project is the design …
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Proactive Management Of Lost Bank Cards
… fault detection, offering early signs of mechanical failure. In modern connected vehicle environments, deviations from well-established driver behaviour could indicate theft, misuse, or safety concerns.
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Performance and design improvements toward the commercialization of a needle-free jet injector/
… reduced drag on the coil while eliminating a mechanical failure mode caused by moving cables. A low cost optical encoder system has been implemented to provide 5 pm position resolution for the actuator and this has improved error of volume ejections to 0.3 pL. All these improvements have also …
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Surface properties of poly(bisphenol-A-carbonate)
… residual stress (a major reason for premature mechanical failure) was primarily attributed to cold moulding and poor mould design coupled with inadequate testing of, the finished product. The high birefringence observed in the moulding was predominantly attributed to molecular orientation and …
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Staphylococcal Enterotoxin B-Induced Acute Lung Injury:Mechanism and Treatment of Disease
… of patients. The role of activated T cells and failure in capillaries of the lungs has been demonstrated in ALI; however the detailed mechanism of disease remains unclear. This study offers a better understanding of the mechanism of Staphylococcal Enterotoxin B (SEB)-induced acute lung injury. …
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The Reuse of Circular External Fixator Components: An Assessment of Safety and Potential Savings
… a circular external fixator was 5.8 months. No mechanical failure events were recorded during the study period. Our institution saved approximately 52% (R717 503.89) and 63 % (R136 568.19) of expected total cost for hexapod and Ilizarov frames respectively. Conclusion: The strategy of reusing …
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