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 1261 for “"clearance"”.
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Clearance systems at brain borders
… in cervical lymph nodes. Inhibiting glymphatic clearance abolished the removal of amyloid by multisensory 40 Hz stimulation. Using chemogenetic manipulation and a novel genetically encoded sensor for vasoactive intestinal peptide (VIP), we found VIP+ interneurons facilitate glymphatic clearance …
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Clearance pricing optimization at Zara
… challenges deals with the management of its clearance sales where the remaining inventory at the end of its sales campaign must be sold at a discounted price. These clearance sales are fast-paced and pricing decisions must be made for more than 11,000 different fashion designs that Zara …
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Turbine tip clearance loss mechanisms
… The loss mechanism examined is that due to tip clearance vortex mixing. The effects examined were three-dimensional blade stacking, downstream transition duct geometry, and unsteadiness due to an upstream nozzle guide vane. Tip leakage loss changes due to three-dimensional blade stacking (bowing …
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Advanced techniques for flutter clearance
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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Clearance management in twin screw compressors
… compressors is heavily dependent on the rotor clearances within them, chamber models, used as design aids, allow for the specification of their magnitude and distribution but do not account for how these may vary during operation, as a result of internal temperature changes caused by the …
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Mangrove ecosystem dynamics and clearance impacts
… increased in area in recent decades. Mangrove clearance is increasingly being used as a strategy to manage this expansion. One of the aims of mangrove clearance is to return sandflat habitats which may have been historically present. This thesis provides new insights into the impact of mangrove …
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Tip-clearance effects in axial compressors
The flow in the tip-clearance gap of a compressor has a profound effect on its performance, but understanding of the actual flow phenomena involved is limited. The current work aims to improve the situation through a comprehensive set of tests on a compressor with different clearance sizes and …
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Dynamic clearance modelling of steam turbines
… intervention in order to predict the internal clearances of high-pressure and intermediate-pressure turbines from Eskom's current turbine fleet. The study saw the utilisation of the Nozzle Analogy theory to develop a 1D multistage turbine thermofluid model as well as the development of a …
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A MOLECULAR UNDERSTANDING OF ANEUPLOID CELL CLEARANCE
Chromosome segregation errors can lead to aneuploidy, an abnormal chromosome number associated with cancer and genome instability. My Ph.D. research focused on understanding the interplay between aneuploid cells and the immune system. By utilising mass spectrometry and the Surfaceome database, I …
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RNA binding proteins in neurotoxic protein clearance
… including Parkinson’s disease (PD). Deficient clearance of damaged cellular components, misfolded proteins, and aggregates leads to the accumulation of neurotoxic proteins, and an increase in cellular stressors such as reactive oxygen species – eventually causing neuronal cell death. In the …
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Vortical structures in turbomachinery tip clearance flows
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991.
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Loss mechanisms in turbine tip clearance flows
Numerical simulations of tip clearance ow have been carried out to dene the loss generation mechanisms associated with tip leakage in unshrouded axial turbines. Mix- ing loss between the leakage, which takes the form of a strong embedded streamwise vortex (u=ux 1 in the vortex core), and the …
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Understanding and Targeting Clearance of Persistent HPV Infections
Given the great diversity of HPV types and tropism to epithelial sites (with associated diseases ranging from mild skin lesions to cancer), they share general genome organization and life strategy for long term infection after initial disease regression. Persistent infected cells form a viral …
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Effects of asymmetric tip clearance on compressor stability
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1996.
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The effect of several physiotherapeutic interventions on tracheobronchial clearance: evaluation by means of measurement of tracheobronchial clearance using a radio-aerosol technique
Contains fulltext : mmubn000001_095635424.pdf (Publisher’s version ) (Open Access)
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Active control of tip clearance flow in axial compressors
Control of compressor tip clearance flows is explored in a linear cascade using three types of fluidic actuators; Normal Synthetic Jet (NSJ; unsteady jet normal to the mean flow with zero net mass flux), Directed Synthetic Jet (DSJ; injection roughly aligned with the mean flow), and Steady Directed …
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Parametric dependencies of aeroengine flutter for flutter clearance applications
… studies are used to develop a rational flutter clearance methodology-a test procedure to ensure flutter-free operation. It is shown, under conditions relevant to aeroengines, that four nondimensional parameters are necessary and sufficient for flutter stability assessment of a given rotor …
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Role of tip clearance flow on axial compressor stability
… of the fluid dynamic phenomena that link tip clearance flow to the formation of short length-scale (spike) rotating stall disturbances has been carried out. It is found that the onset of growth in tip clearance blockage characterizes the lowest flow coefficient for which a steady blade passage …
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HIGH-SPEED ROTOR TIP CLEARANCE MEASUREMENTS IN A TRANSONIC COMPRESSOR
… blade’s tips and the surrounding casing, the tip clearance, which dynamically changes with rising rotor speed due to rotor blade radial growth from centrifugal loading. Too large a tip clearance introduces disruptive air flow that will lower compressor efficiency and lead to stall conditions, …
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