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 59 for “"Gap size"”.
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Gap Size Effect on Low Reynolds Number Wind Tunnel Experiments
A system was designed to measure the effect of gap size on semi-span low Reynolds number wind tunnel experiments. The lift forces on NACA 1412, NACA 2412 and NACA 4412 half wings were measured using a strain gauge balance at chord Reynolds numbers of 100,000 and 200,000 and three different gap …
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The effect of gap size on performance of metal plated joints in compression
Metal plate splice joints with gaps between butting pieces of lumber were tested in compression to evaluate the effect of gap size on joint serviceability performance. The current design methodology for compression splice joints was also evaluated. Specimens representing floor and roof trusses, …
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Impact of Gap Size on Environmental Conditions, Survival, and Early Growth of 5 Pacific Northwest Species
The formation of forest gaps and their resulting size and shape is highly variable across forest types and can produce a wide range of patterns in seedling establishment. The impact of gap size on microclimate and seedling growth and survival after planting, specifically in mixed-species stands is …
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A study of the influence of ring gap size on the lubrication of piston rings in an internal combustion engine
… was focused on the influence of the size of the piston ring gap in the top two rings on the OFT between the piston ring and cylinder liner of a single cylinder diesel engine (Hatz lB2O). The project studied the power stroke (at 500 ATDC for the top ring and 40° ATDC for the middle …
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Ecological Impact of Glaze Storm Damage in an Appalachian Oak Forest
Glaze damage to canopy trees, gap size and seedling regeneration was surveyed relating to site topographic features after a major glaze storm at Fishburn Forest in the central Appalachian mountain region. The survey sites were stratified according to aspect and landform, and sample plots were …
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The drag and lift characteristics of a cylinder placed near a plane surface
… of the drag coefficient as a function of gap size was found to exhibit an interesting and unexpected trend. The drag was a minimum when the cylinder was resting on the plate and was a maximum at a gap size of approximately one cylinder radius. Flow visualization studies together with …
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End plate gap effects on a half-wing model
… airfoil. Earlier investigations found that the size of the hysteresis loop was affected by the tunnel environment and that single strut mounting of a three dimensional wing model interfered negligibly with the wing. Theoretical and experimental evaluations of a half wing model mounted with an …
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Management Strategies for Pitch Canker Infected Año Nuevo Stands of Monterey Pine
… used to evaluate the impact of the variables of gap size (0.20-hectare, 0.10-hectare, and 0.05-hectare), site-preparation treatment (pile and burn, lop and scatter), and parent tree (13 local seed sources). Pitch canker symptoms were quantified to conclude if there is indeed a range of expressed …
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Molecular Mechanisms of Lymphocyte Activation - Please Mind the Gap
… studies. This model proposes that the small gap between an antigen-presenting cell and an immune cell excludes large, inhibitory phosphatases, causing cell signalling. This work examines lymphocyte signalling phenomena in the light of the KS model. Single molecule and bulk experiments explore …
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Development of ice-bonded ballast in sub-freezing temperatures and its effect on maintenance operations during a winter rail break
… rail at defects, causing the rail to break and a gap to open. This study quantified the effect of frozen ballast on shear strength, f0, and rail gap size using laboratory experimental data and Illi3D, a field-validated finite element model (FEM). The laboratory data were transformed into f0 using …
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Polyelectrolyte multilayers (PEM) in micro / nanofluidics for novel BioMEMS platforms
… such as ion-perm selectivity and nanometer-sized structures. In order to establish industrial applications for biotechnology and medicine, including separation of biomolecules, drug delivery, and single molecule detection, however, regular planar nanofluidic channels have limited fluidic …
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Dynamic Gap-Crossing Movements in Jumping and Flying Snakes
Gap crossing is a regular locomotor activity for arboreal animals. The distance between branches likely plays a role in determining whether an animal is capable of crossing a given gap, and what locomotor behavior it uses to do so. Yet, despite the importance of gap distance as a physical parameter …
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Shear behavior and microstructures of confined colloidal suspensions
… charge-stabilized suspensions confined to gap sizes on the order of a few particle diameters are investigated by molecular dynamics computer simulations. Suspensions of uniform spheres at volume fractions ranging from 0.28 to 0.53 covering the crystalline phase are studied. The suspensions …
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Hydraulically controlled magnetic bougienage for correction of long-gap esophageal atresia
… their esophageal disconnected and separated by a gap, which is called esophageal atresia. Esophageal atresia with a relatively short gap can be directly corrected with surgery, whereas babies with a relatively long gap requires a treatment over several weeks to stretch the esophageal pouches. In …
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Studies in vibrofluidized beds and synthesis of silica catalysts
… rate and pattern as well as the air-gap size on heat-transfer coefficients between a horizontal, cylindrical heater and vibrated beds of Master Beads (spherical alumina) and glass spheres was studied. Solid piles were observed to form at specific bed locations. Solid-circulation paths …
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Improving the performance of aerofoil sections using momentum transfer via a secondary flow
… in that the most important parameters are the gap-size i.e. the length over which the two fluids are in contact and the velocity gradient between the two fluids.<br/><br/>However, it also raised questions that required an additional in-depth analysis of the parameters governing the flow control …
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Thermo-mechanical model of steel shell behavior in continuous slab casting
… interface between the shell and the mold and the size of the gap. The effects of mold distortion and taper on the gap size are also included. The effect of fluid flow has been incorporated via a heat flux imposed at the solid-liquid interface, which is obtained from a separate fluid flow model. …
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Development of energy efficient membrane distillation systems
… systems, with particular focus on the Air Gap Membrane Distillation (AGMD) configuration. A detailed ID numerical model to explore the effect of design parameters on energy efficiency was developed. Means to enhance energy recovery from hot discharge brine without additional brine …
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A Computational Study of Axial Compressor Rotor Casing Treatments and Stator Land Seals
… of knife seals were dependent primarily on the gap size of the seals.
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Photocurrent Spectroscopy Study of Graphene / Hexagonal Boron Nitride Moiré Superlattice In the Far-Infrared Regime
… superlattices, where I accurately measure the gap ∆ opened at charge-neutral point (CNP) by the moiré superlattice. The relationship between the gap size and the moiré wavelength will also be discussed. Finally, I will discuss the possibility of applying this technique to other novel physics …
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