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 49 for “"WSS"”.
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Framework for risk-based management and safety of railroad bridge infrastructure using wireless smart sensors (WSS)
… bridges employing Wireless Smart Sensors (WSS). Wireless strain gages installed in the rail measured real-time trainloads and speeds, while wireless accelerometers and magnetic strain gages measured associated bridge responses. The sensing system was deployed and validated on multiple …
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Wall shear measurements in arterial flows
… upon shear stress (SS) and wall shear stress (WSS) levels, as well as particle residence times. The relationship between these hemodynamic parameters and vascular injury response is of great relevance to understanding the cardiovascular disease process. In this work, new methods and algorithms …
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Novel mechanical alignment and component fabrication for wavelength-selective optical switches
… free-space wavelength selective switches (WSSs) offer significantly increased integration over current linear WSS technology, providing a step change in switching capacity. The fabrication of two-dimensional WSSs presents significant optomechanical challenges. This thesis develops a range …
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Application Of In Vivo Flow Profiling To Stented Human Coronary Arteri
… profiling hemodynamics and wall shear stress (WSS) distribution in human coronary arteries. The methodology involves fusion of 2D Intra Vascular Ultra Sound and Bi-plane angiograms to reproduce the 3D arterial geometry. This geometry is then used in a Computational Fluid Dynamics (CFD) module …
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Attachment mechanisms of a novel, targeted, lipid-based, ultrasound contrast agent
… of microbubble detachment under very high WSS. The flow chamber has been calibrated to 50Pa wall shear stress (WSS) using laser Doppler anemometry (LDA). Higher WSS was achieved through the use of higher viscosity fluids. The streptavidin-biotin bond has been assessed within the flow …
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Multi-scale structural health monitoring using wireless smart sensors
… in recent years in the wireless smart sensor (WSS) technology to monitor civil infrastructures, shifting focus away from traditional wired methods. Successful implementations of such WSS networks for full-scale SHM have demonstrated the feasible use of the technology. Much of the previous …
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Rheological Aspect of Cell-Free Layer Formation in Micro-blood Flow: Experimental and Numerical Study
… of the CFL on the arteriolar wall shear stress (WSS) were examined in the rat cremaster muscle in vivo. A new histogram-based algorithm was suggested for better determination of the CFL width. The elevation in RBC aggregation increased the CFL width and attenuated the RBC-wall contact frequency. …
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The Political Economy and Coalitions in Botswana’s Water Sector Reform 2009-13: to what extent can the process of reform be understood?
… of clean water and improved sanitation services (WSS) to all, and water resource management (WRM), in a water insecure country, dependent for surface water on international river basin organisations. The study provides a crtitical analysis of policy change in progress. The impact of the water …
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Investigation Into The Role Of Biomechanical Forces In Determining The Behaviour of Coronary Atherosclerotic Plaques
… of acute coronary syndrome. Wall shear stress (WSS) on the other hand has been implicated in early plaque development and plaque growth suggesting that both PSS and WSS can influence future plaque behaviour. The work presented in this thesis is associated with a number of novel findings. First, …
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Occupational stress, well-being, and pediatric occupational therapists: A mixed-methods study
… validating sample of the Workplace Stress Scale (WSS) indicated that there were significantly higher stress levels of the participants in this study compared to the validating sample with a large effect size. The WSS and the Work Environment Impact Scale-Self Report (WEIS-SR) demonstrated a …
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Shear Stress-Mediated Tumor-Endothelial Cross Talk Regulates the Angiogenic Potential of Breast Tumors In Vitro
… (10 dyn/cm^2) microvascular wall shear stresses (WSS) were introduced. Endothelial cells lining the microchannel lumen form a confluent endothelium across which soluble growth factors are exchanged with tumor cells in the gel. Microscopic particle image velocimetry ("-PIV) was integrated within …
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Computational modelling of blood flow through sutured and coupled microvascular anastomoses
… velocity profile; high Wall Shear Stress (WSS); high Shear StrainRate(SSR);and elevated vorticity at the suturesites. The coupled anastomosis simulation showed a small increase in maximum WSS at the anastomotic region compared to a pristine vessel. However, this was less than half that of …
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Studies of Stented Arteries and Left Ventricular Diastolic Dysfunction Using Experimental and Clinical Analysis with Data Augmentation
… the changes in Wall Shear Stress (WSS) and Oscillatory Shear Index (OSI) caused by the implantation of coronary stents into the arteries of the heart using Particle Image Velocimetry. These experiments featured one-to-one scaling, commercial stents, and realistic flow and pressure …
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Efficacy of oral corticosteroids for preschool wheeze
… outcome was the change in wheeze severity score (WSS), and secondary outcomes were length of hospital stay (LOS), revisit to general practice (GP)/emergency department (ED) or hospital, and further use of asthma medications. I performed a two-stage meta-analysis for overall analyses and adopted a …
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Numerical Simulation of Unsteady Flows of Physiological Relevance
… have shown clear patterns of wall shear stress (WSS) variations. Local regions of temporal and spatial variations of the WSS was found at sites usually referred to as risk-sites of atherosclerosis, but also at locations often referred to as ``safe''. Some of the characteristics of the WSS are …
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Investigating metabolic and mitochondrial adaptations triggered by blood flow during the endothelial-to-hematopoietic transition
… from iPSCs utilizing wall shear stress (WSS) to help promote HSC generation. However, the mechanisms through which WSS regulates hematopoiesis remain poorly understood. Scientists, therefore, continue to look for the mechanotransduction pathways that promote hematopoiesis, and key answers …
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In Space Reverse Logistics
… and to bring them to a Workshop Space Station (WSS) for centralized on-orbit servicing (OOS). A modular probabilistic Failure Model is proposed, designed, and implemented to collaborate with a custom-made orbital propagator to work as a space logistics simulator. The ISRL Failure Model is a …
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Employing Fluid Structure Interaction Analyses to Reveal Insights in Atherosclerotic Progression in the Carotid Artery
… low levels of hemodynamic Wall Shear Stress (WSS) facilitate atherosclerotic stenoses (arterial blockages). Despite numerous studies on this phenomenon, the effects of how stenosis severity in simultaneity with its orientation relative to bulk flow may affect the rate of disease progression …
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Torrefaction and Steam Explosion of Selected Biomass for Biofuel Production
… was conducted on white spruce sawdust (WSS) at temperatures of 200 °C, 250 °C, and 300 °C and retention times of 5 min, 7 min, and 9 min in an inert environment. Torrefaction pretreatment is a mild form of pyrolysis that has the potential to produce high-quality raw material for making …
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Sensitivity of Hostile Hemodynamics to Intracranial Aneurysm Geometry
… rupture to be associated with wall shear stress (WSS) and jet impingement, but these studies may be overlooking turbulent-like flow instabilities. This thesis investigates the nature of these flow instabilities and risk parameters in the context of uncertainty due to geometry. To characterize …
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