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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 35 for “"grain orientation"”.
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An Experimental Investigation of Structural Composite Lumber Loaded by a Dowel in Perpendicular to Grain Orientation at Yield and Capacity
… analysis of beams loaded perpendicular to grain at midspan by a bolted double-shear laterally-loaded connection. Connection specimens were loaded monotonically until capacity was reached. Variables of consideration included the loaded edge distance of the connection main member, the …
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Tensile Properties of Loblolly Pine Strands Using Digital Image Correlation and Stochastic Finite Element Method
… the effect of the intra-ring properties and grain angles on the modulus of elasticity (MOE) and ultimate tensile strength (UTS) of different orientation wood strands and to analyze the sensitivity of the MOE and UTS of wood strands with respect to these variables. Tension testing …
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Cu2O thin films for p-type metal oxide thin film transistors
… conduction mechanisms (i.e. trap-limited and grain-boundary-limited conduction) is performed. This shows that the low carrier mobility of as-deposited Cu2O is due to significant grain-boundary-limited conduction. In contrast, after annealing, grain-boundary-limited conduction becomes …
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Investigating Wood Welding Parameters Using a Prototype Welding Machine
… welding frequency and duration interaction, grain orientation effects, alternative welding completion metrics, and strength development over time. During the wood welding process, three distinct phenomena were repeatedly observed: smoke creation, welding residue formation, and an audible …
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Analysis of Solute Mixing at the Pore-Scale Using Micromodels and Lattice -Boltzmann Finite Volume Modeling
… flow zones enhances reactive transport, (iii) grain orientation has a significant effect on extent of mixing and product formation, (iv) grain size (as is commonly used) is not an accurate predictor of mixing, and (v) intra-particle porosity does not have a significant effect on steady-state …
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Structural defect engineering of tin (II) sulfide thin films for photovoltaics
… defects including intragranular defects and grain boundaries are directly related to minority-carrier collection length using high-resolution correlative electron microscopy. The results suggest that intragranular point defects, as opposed to extended structural defects, are likely …
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Unlocking single molecule detection sensitivities in surface-enhanced Raman spectroscopy
… centimeter-scale nanosphere assembly with large grain sizes of 150μm is demonstrated for hydrophilic silicon substrates. The resulting hexagonally symmetric gold bowtie arrays present three different bowtie motifs that are characterized by 0o, <60o and 60o differences between the grain …
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A study of the recrystallization and the mechanical properties of indium
… hardness, bending strength, crystallographic orientation and microstructure was studied. The range of recrystallization temperature for small amounts of cold work was from -40° to 0° C and for large amounts of cold work was from -11° to -70° C.</p> <p>The mechanical properties were found to be …
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Bacterial biofilms and biomineralisation on titanium
… Ti6Al4V alloy, pure aluminium and pure vanadium. Grain boundaries, grain orientation and alloy phase structure did not influence adhesion or early proliferation. Adherence of all four strains was equivalent on pure titanium and Ti6Al4V and inhibited on pure aluminium. Serratia biomineralisation …
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Chemical Vapor Etching of Copper Using Oxygen and Various Beta-Diketones
… was studied as a function of time, temperature, grain orientation, oxygen partial pressure, beta-diketone, and beta-diketone partial pressure. Studies were performed at total pressures ranging from 10 to 200 Torr and substrate temperatures of 250 to 400°C. Copper disks, 9 mm in diameter, as …
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New structural interpretation, microstructural analyses, and preliminary monazite geochronology of Proterozoic rocks in the central Manzano Mountains, New Mexico
… Geochronologic studies of metamorphic monazite grains will place time constraints on when movement occurred within the area. Metamorphic monazite grown during tectonic deformation can have incremental growth patterns such as rim and core features. The ability to relate grain orientation to …
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Radiant Auto-Ignition of Wood
… mass loss were continuously recorded. The wood grain orientation was aligned either perpendicular or parallel to the incident heat flux. The time for flaming ignition is measured up to 70 kW/m2 and compared to piloted ignition results of Spearpoint and Quintiere [28,29] with little difference …
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Effects of composition and ausaging on microstructures and magnetic shape memory response of Fe-Ni-Co-Ti alloys
… this result is thought to be due to the random grain orientation in the polycrystalline materials studied.
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Bending Performance of Spliced, Nail-Laminated Posts With Edge Reinforcement
… forming butt joints without changing the grain orientation of the board. Two toothed connector plates 1 1/2 inches wide by 39 inches long pressed into the narrow edge of each board were used to splice the board back together. The individual bending stiffness about the strong axis of each …
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Exploration of incompatibility in Al-Li alloys using high energy diffraction microscopy and a crystal plasticity model
… is a secondary form of fracture along flat grain boundaries that initiates as a result of highly localized deformation. Currently, designers are reluctant to use Al-Li in structural applications due to concerns over the potential for delamination fracture and the inability to predict/account …
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Microfabrication of surface electrode ion traps for quantum manipulation
… process. In particular, we explore how grain size and grain orientation affect the ion motional heating rate. This thesis is divided into two parts. In the first part, we describe the fabrication of gold, silver, aluminum and niobium traps from different processes, which results in …
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Modeling The Atomic And Electronic Structure Of Metal-Metal, Metal-Semiconductor And Semiconductor-Oxide Interfaces
… into the role of quantum mechanical confinement, grain orientation in the conductivity degradation of polycrystalline Cu interconnects. The use of homogeneous compressive</p> <p>strain in improving the conductivity of copper has also been studied using this model.</p> <p>The impact of interface …
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The impact of coating architecture on the hardness, friction and wear resistance of hard and tribological nanocomposite coatings
… coating microstructure which include density, grain size, grain boundary chemistry, porosity, and grain orientation.</p><p>In this research effort bias sputter deposition, co-sputtering, and magnetron sputtering-pulsed laser deposition are used to deposit and control the formation of composite …
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Characterization of Mixed-Mode Fracture Testing of Adhesively Bonded Wood Specimens
… and affect the value of Gc of the specimens. The grain orientation of latewood and earlywood, materials that often have different densities and elastic moduli, limits the accuracy of traditional standard methods for the evaluation of Gc. The traditional methods, described in the standards ASTM …
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Advancing characterization techniques for structure-property determination of in-situ lignocelluloses
… analysis. Plasticizing solvents and wood grain orientation significantly affected the lignin glass-transition temperature. Dynamic TTS reveals that while all storage modulus data shift smoothly, the thermorheological complexity of solvent-plasticized wood becomes evident in loss component …
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