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 96 for “"Scale Effects"”.
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Scale effects in tests on footings
… dissertation presents an investigation of the effects of stress, and of absolute and relative particle size, in tests on vertically loaded footings. Two granular materials, namely, a silica rock flour and a Chatelet flint grit, which differed in nominal diameter by a factor of 50 but were …
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Understanding molecular scale effects during photoresist processing
… of photoresist features are now at the nanometer scale, where effects of individual molecules are important. In recognition of the industrial need for a molecular-scale understanding of photoresist performance, mechanistic models have been developed for each of the several photolithography …
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Scale effects in electromagnetic properties of composites
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01
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Scale effects in microindentation of ductile crystals
… of materials. In the past several decades the scale of indentation testing has moved into the micron and even sub-micron range. For many types of materials, at these small length scales, the hardness of the material measured by the indentation test depends on the depth of the indentation. This …
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Length-Scale Effects on Nano-Scale Materials Behavior
… sizes below 20 nm. (2) Texture and anelastic effects cannot explain the elastic behavior at the nano-scale and we propose a mechanism based atomic-scale interactions. (3) In-situ TEM tests show that below a transitional length-scale (50 nm grain size for aluminum), dislocations cease to exist …
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Observation scale effects on fluid transport behavior of soil
… properties of soil are examined at three scales: pore-scale, sample volume-scale, and field-scale. Undisturbed soil cores were taken at 19 subsites spaced logarithmically along a 150 m line transect in a Groseclose mapping unit near Blacksburg; Virginia. Three core sizes were taken at each …
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Experimental Investigation and Modeling of Scale Effects in Micro Jet Pumps
… power generation and propulsion systems on the scale of centimeters or smaller. This effort led to the creation and expansion of a field of research focused around the design and reduction to practice of Power MEMS (microelectromechanical systems) devices, beginning first with microscale jet …
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Multiscale modelling and an experimental investigation on size-scale effects in concrete
Classical continuum mechanics assumes that constitutive parameters are associated with a so-called Representative Volume Element (RVE) and are a statistical average. This concept is based on the presumption that the specimen size is much larger than the size of its constituents, so that the …
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Experimental studies of scale effects on shear strength, and deformation of rock joints
The effect of scale on shear strength is studied by performing direct shear tests on different sized samples of large joints. A rubber moulding system is used to obtain impressions of the roughness from a variety of natural joint surfaces. A brittle model material is developed and used to cast …
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Scale effects in testing of a monopile support structure submerged in tidal currents.
… of Tidal Current Energy (TCE) technology. Small scale model testing of TCE devices is a major challenge facing the technology due to turbulent flow in tidal currents environment and scaling is a fundamental engineering procedure for prototype development and optimisation for cost effectiveness. …
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Flow Dynamics in Large River Basins: Self -Similar Network Structure and Scale Effects
… kinematic and hydrodynamic) as a function of scale, or Strahler order of the basin, are studied. It is found that in basins with self-similar network structure in which Horton's laws of stream lengths and stream areas hold, the dispersion coefficients obtained for equilibrium flow conditions …
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Scale Effects of Seasonal Production in the United States Raw Cane Sugar Industry
Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
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Scale effects in buckling, postbuckling and crippling of graphite-epoxy Z-section stiffeners
Scale model testing can improve the cost-effectiveness of composite structures by reducing the reliance on full size component testing. Use of scale models requires the relationship be known between the responses of the small scale model and full size component. This relationship may be predicted …
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Local and landscape scale effects of fragmentation on aerial insectivorous bats in the Amazon
… for over 40 years, has been investigating the effects of deforestation, fragmentation and recovery on tropical biota. Amazonian aerial insectivorous bats provide vital forest ecosystem services, yet as a group they are understudied compared to their phyllostomid counterparts. This study aims to …
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Multi-scale effects on deformation mechanisms of polymer nanocomposites : experimental characterisation and numerical study
… by introducing a small amount of solid nano-scale fillers (normally less than 5 wt%) such as nanoclay, carbon nanotubes or nanofibres into a plastic resin to dramatically enhance its stiffness, strength and thermal properties. The difference between nanocomposites and conventional fibre …
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The behaviour of Siphon Spillways, with particular reference to air entrainment and model scale effects
… project . The models are constructed to the scales 1:20, 1:10 and 1:7. The model scale effects, the rate of air entrainment, the air flow under the inlet lip, the negative air pocket pressures, the priming characteristics , the 'hunting' effect , the energy at inlet and the drawdown velocity …
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Evaluation of Scale Effects in Load-Displacement Response of Drilled Shafts Based on Field Load Tests
… collected as part of an evaluation of scaling effects in load-displacement response of drilled shaft foundations. Drilled shafts ranging in diameter from 2 to 9.8 feet with lengths of embedment ranging from approximately 13 to 250 feet were collected as part of this study. The dataset …
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Habitat and landscape-scale effects on the abundance and diversity of macro-moths (Lepidoptera) in intensive farmland
… study aimed to determine the landscape and local-scale factors influencing moth abundance and species richness in intensive Northamptonshire farmland. The research consisted of four parts: 1. the analysis of historic county moth records using landscape-analysis, 2. Moth trapping in areas of …
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Multi-Scale Effects of Poling on Structure-Property Relationships in Lead Magnesium Niobate-Lead Titanate Single Crystals
… contribution to the super-structure. The effects of poling on domain and crystallographic structure, and on phase transformation behavior, are reported. The use of PMN-PT piezoelectric crystals is dependent on successful poling methods.
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