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 173 for “"size effects"”.
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Size Effects on Transport in Graphene
… it, this thesis systematically studies the size effects on the electron and spin transport properties of graphene: two of the fundamental aspects of graphene-based electronic devices. Two types of devices: graphene field-effect transistors and graphene lateral spin-valves were manufactured …
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Size Effects in Shape Memory Ceramics
… successful, it typically limits SMCs to sample sizes at the micrometer-scale in micro-pillar and micro-particle structures. Here it is proposed that the strategy of simply lowering the grain boundary area can result in bulk SMCs that do not crack as these structures, like the micropillars and …
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Incorporating Grain Size Effects in Taylor Crystal Plasticity
<p>A method to incorporate grain size effects into crystal plasticity is presented. The classical Hall-Petch equation inaccurately predicts the macroscopic yield strength for materials with non-equiaxed grains or materials that contain unequal grain size distributions. These deficiencies can be …
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Section-Size and Notch-Size Effects in Fatigue
Made available in DSpace on 2014-12-12T00:25:53Z (GMT). No. of bitstreams: 1 7317378.pdf: 3467042 bytes, checksum: 1f4ac849cb7ff08297987ce46402d5c7 (MD5) Previous issue date: 1972
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Specimen size effects in slow strain-rate testing
… dimensions in slow strain-rate environmental effects testing. Tension tests of free machining brass were conducted in a mercuric nitrate solution at a constant crosshead displacement rate of 10⁻³(inch/sec). Thirty-six smooth round bar specimens with different dimensions were tested. It was …
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Investigation and characterization of size effects in microforming processes
… be miniaturized without considering possible size effects.</p><p>The goal of this research was to determine if deformation size effects occur with miniaturization. Both deformation size effects with respect to specimen size and grain size were considered through the investigation of two …
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Hot Mix Asphalt Permeability: Tester Size Effects and Anisotropy
Permeability of hot mix asphalt (HMA) is a property that is important to the pavement's durability. Measuring permeability along with density will give a better indication of a pavement's durability than density alone. The presence of water for extended periods of time in the pavement is directly …
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Sediment size effects on self-organisation behaviour of rip channels
… sediment characteristics exert the controlling effects on the states of beaches and determine the development of rip channel system. Although the role of wave conditions on the rip channel dynamics has been extensively studied, little attention has been paid to the effects of sediment …
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Grain size effects on the fatigue response of nanocrystalline materials
… is known to be influenced significantly by grain size. Based on a wealth of experimental results obtained from microcrystalline metals, where the grain size is typically greater than 1 um, it is widely recognized that an increase in grain size generally results in a reduction in the fatigue …
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Grain constraint and size effects in shape memory alloy microwires
… cycling is investigated, revealing training effects as well as fatigue life and fracture. Finally, size effects in damping and transformation morphology are studied and it is shown that a transition from a many-domain to a single domain martensite morphology takes place when the wire diameter …
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Computational models of particle size effects on brittle oxide scale erosion
… model. Several parameters such as size of the erodent, temperature, velocity of the erodent, angle of attack were varied and the influence on volume loss of oxide layer was studied. The results were presented in the form of stress contours and the graphs between the volume loss in …
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Predicting precursor size effects on organic cage formation with molecular dynamics
… because there is no consistent method to synthesize them in organic solvents. Harnessing the congregation capabilities of the cage-precursors in a systematically predictable fashion remains largely empirical. Herein, we use molecular dynamics simulation to predict the likelihood for the …
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Calcium Carbonate Particle Size Effects on Titanium Dioxide Light Scattering in Coatings
… pigment volume concentration (PVC). Different sized CaCO3 particles were used in this study. A series of PVC ladder studies were performed at keeping CaCO3 PVC constant. Paints were formulated at the same volume solids to minimize variability. Weighed coating draw-downs were prepared to measure …
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Nuclear magnetic resonance study of quantum size effects in supported platinum particles
The author has observed, and studied quantum size effects in the NMR of small, supported platinum particles with a monolayer of carbon monoxide chemically adsorbed to the surface. The effects are observed in the 13c and 195pt NMR, primarily at 4.2K. He reports nonmetallic spin-lattice relaxation, …
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Nuclear magnetic resonance study of quantum size effects in supported platinum particles
The author has observed, and studied quantum size effects in the NMR of small, supported platinum particles with a monolayer of carbon monoxide chemically adsorbed to the surface. The effects are observed in the $\sp{13}$C and $\sp{195}$Pt NMR, primarily at 4.2K. He reports nonmetallic spin-lattice …
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Electron-ion correlation and finite-size effects in quantum Monte Carlo simulations
… thesis, we explore different ways to include the effects of dynamic ions and tackle challenges that arise in the process. We benchmarked the diffusion Monte Carlo (DMC) method on electron-ion simulations consisting of small atoms and molecules. We found the method to be nearly exact once …
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Analytical model development and experimental investigation of process model size effects in microforming
… not effectively be used at the microscale due to size effects, i.e. changes in material and process parameters with miniaturization. Size effects with respect to material properties and frictional conditions have been demonstrated in past research. This dissertation demonstrates the existence of …
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A numerical & experimental investigation into size effects within loaded additively manufactured cellular solids
… identify experimentally. In micropolar theory a size effect is predicted in bending and torsion which is revealed as an increase in relative stiffness with decreasing size at scales approaching the cellular microstructure. Thus, at the microstructural level, size and scale becomes an important …
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Multiscale modeling of rate dependence and size effects on nanocrystalline metallic thin films
… nanocrystallinity also leads to undesired effects, such as increased strain-rate sensitivity and creep rates. The key characteristic responsible for the unique properties of nanocrystalline materials is the relatively large fraction of atoms that lie on the grain boundaries. The …
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Theoretical investigations of reduced size effects in gallium-arsenide and heterostructure electron devices
In this thesis physical effects due to the reduced size of semiconductor devices are investigated theoretically. Effects due to statistical fluctuations and boundary conditions at heterointerfaces are examined, specifically, electron transport models are developed for the effects of impurity …
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