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 15 of 15 for “"Mechanical impact"”.
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Sticks With Stones: Controlled Experimentation in the Use of the Weighted Atlatl
… There is still no consensus concerning the mechanical and symbolic functions of stone atlatl weights. In this study, I begin to resolve this uncertainty through a systematic experimental test of the hypothesis that adding weight to an atlatl results in a mechanical impact on weapon …
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Mechanical loading and cartilage physiology
Whilst mechanical impact is known to be essential for cartilage maintenance, it has been noted that altered joint loading and increased force may lead to cartilage degradation and increase the risk for the development of osteoarthritis (OA). This study investigated the cellular responses of …
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The role of microstructure on the combustion and impact behavior of mechanically activated nickel/aluminum reactive composites
… during exothermic reaction after thermal or mechanical initiation. However, conventionally these materials typically have slow reaction rates and are difficult to ignite at typical micron particle size ranges limiting their application. Therefore, mechanical activation techniques have been …
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Ultrasonic hot spots in solids
Mechanical action can produce dramatic physical and mechanochemical effects when the energy is spatially or temporally concentrated. An important example of such phenomena in solids is the mechanical initiation of explosions, which has long been speculated to result from ‘hot spot’ generation at …
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ΣΥΓΚΡΙΤΙΚΗ ΜΕΛΕΤΗ ΤΗΣ ΣΥΓΚΡΑΤΗΤΙΚΗΣ ΙΚΑΝΟΤΗΤΑΣ ΤΟΥ ΑΜΑΛΓΑΜΑΤΟΣ ΑΠΟ ΤΙΣ ΚΑΡΦΙΔΕΣ (T.M.S.)
… FOLLOWS AND THE LESS RETENTION WAS OBTAINED WITH MECHANICAL IMPACT CONDENSATION APPARATUS.
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Development of a biofidelic cranial bone surrogate using additive manufacturing
… are widely used in many applications, including mechanical, impact and blast, and biomedical testing. Such surrogate models often attempt to mimic the properties of bone to achieve best results. This research focuses on using additive manufacturing to develop a 3D printed cranial bone surrogate …
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Destructive disassembly of bolts and screws using impact
… their damage during use. As a natural solution, mechanical impact has been suggested as a cost-effective method for destructive disassembly of joining elements. The objective of this research is to improve the efficiency of impact disassembly process by studying the characteristics of elastic …
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Computational modeling and simulation for projectile impact and indentation of biological tissues and polymers
… injuries. Detailed understanding of the mechanical processes at work could aid in the development and evaluation of protective strategies such as armor and helmets, and repair strategies including robotic surgery or needle-based drug delivery. However, due to the mechanical complexity of …
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Effect of the GentleWave System on dentin microhardness and sealer penetration: an in vitro study
This study investigates the impact of the GentleWave (GW) System on dentin hardness and sealer penetration in root canal treatment, aiming to assess its potential advantages over conventional techniques. Conventional instrumentation can alter root canal anatomy, necessitating irrigation methods …
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A Single Cell and Spatial Transcriptomic Investigation of Traumatic Brain Injury: Novel insights into endothelial-derived Eph signaling
… cascade of events, starting with an initial mechanical impact followed by secondary injury brought on by numerous physiological changes that involve significant dysfunction at the cellular and molecular level. One major predictor of severe TBI outcome is the extent of blood-brain barrier …
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Pathological and Biomedical Characteristics of Spinal Cord Injury Determined Using Diffusion Tensor Imaging
… lifetime of therapy and care. It is caused by a mechanical impact that ultimately causes pathophysiological consequences which at this moment in time are an unresolved scientific challenge of great social impact. Scientists have long used animal contusion models to study the pathophysiology of …
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Erosion and rolling contact wear mechanisms in silicon nitride hybrid bearings.
… material damage was by surface weakening due to mechanical impact of bubbles, which enhance fluid entrance and hydrodynamic pressure leading to wear initiation. Micro erosion pits formed in the rolling contact, which accelerated the damage by dislodging grains and bunch of grains. This testing …
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Dynamic Properties of Chondrocytes
… surface that facilitates movement and absorbs mechanical impact. Chondrocytes, the cells within cartilage, experience continuous mechanical loading in vivo and adapt their volume and shape accordingly, a process that is essential for maintaining cartilage health and function. Volume and shape …
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Mechanical characterization and self-healing in synthetic vascularized materials
… self-healing materials have been developed that mechanically recover from structural damage autonomously. One strategy for creating self-healing materials is to distribute reactive fluids throughout the material volume using a microvascular network of microchannels that serve as conduits of flow …
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Characterisation of peracids
… of these peracids under certain stimuli, such as mechanical impact, electric fields and thermal sources. Also, it was hence hoped to be able to suggest how to design stable peracids suitable for the detergents industry. It was found that none of the peracids would suffer dielectric breakdown when …