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 372 for “"Layer Thickness"”.
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Modeling fused filament fabrication machine height accuracy through layer thickness variation
… total height error of a 3D printed part using a layer-by-layer approach. Layer to layer thickness error is modeled across the build height of Polyactic acid (PLA) and Acrylonitrile butadiene styrene (ABS) parts. A height error compensation model is then formulated and applied at a G-code level to …
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The Effect of Smectite Layer Thickness and Fabric Upon Salt Filtration at Room Temperature
… brine approached random fabric. Clay cake thicknesses ranged from 0.5 to 2 centimeters, confining pressure was 5000 pounds per square inch, mean brine pressure was 2300 pounds per square inch, and the differential fluid pressure across the clay cake was 1000 pounds per square inch for …
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Effect of build angle and print layer thickness on clinical accuracy of 3D-Printed orthodontic models
This study investigated how variations in print layer thickness and build angle impact the accuracy of orthodontic models produced using a digital light processing (DLP) 3D printer. Orthodontic models were generated from a digital master model derived from an ideal maxillary typodont scan. The …
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Analysis of microtopography, vegetation, and active-layer thickness using terrestrial LIDAR and kite photography, Barrow, AK
… This study examined changes in the active layer of permafrost near Barrow, Alaska at very fine scale to capture subtle changes related to microtopography and landcover. In 2010, terrestrial LIDAR was used to collect high-resolution elevation data for four 10 m × 10 m plots where maximum …
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Analysis of microtopography, vegetation, and active-layer thickness using terrestrial LIDAR and kite photography, Barrow, AK
… This study examined changes in the active layer of permafrost near Barrow, Alaska at very fine scale to capture subtle changes related to microtopography and landcover. In 2010, terrestrial LIDAR was used to collect high-resolution elevation data for four 10 m × 10 m plots where maximum …
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Lattice Relaxation by Plastic Flow and Study of Apparent Critical Layer Thickness in II-VI/GaAs(001) Heterostructures
… It is applicable to graded and multilayered structures, allows for changes of temperature or growth rate, and accounts for differential thermal expansion. For the implementation of this model we consider an arbitrary structure divided into a number of sublayers, each of which is …
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Investigation of opto-electronical properties of DC magnetron sputtered ZnO:Al films with respect to the layer thickness, annealing temperature and resistance inhomogeneity
… sputtered ZnO:Al films with respect to the layer thickness, annealing temperature and resistance inhomogeneity
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Experimental investigation of the impact of the permeable layer thickness on the surface flow above and the threshold for incipient motion of submerged objects
… those observed in impermeable rough boundary layers. However, the effect of the permeable bed thickness is not fully understood. Current models for threshold of incipient motion implicitly assume an impermeable rough bed when evaluating the fluid forces exerted on submerged objects. Natural …
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Evaluation of printing orientation, layer thickness and auxilary cross-arch bar in 3-dimensional dental printing on the trueness and precision of full arch polymeric fixed dental prostheses
… the effects of different printing angulations, layer thicknesses, and the inclusion of a horizontal cross-arch bar. MATERIALS AND METHODS: Two 3D-printed dental resin materials for full-arch fixed dental prostheses were used in this study; Lucitone Digital IPN™ and OnX Tough 2. A standardized …
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Processing, microstructure and mechanical behavior of nanocomposite multilayers
Nanoscale multilayer coatings have high potential for numerous engineering applications because they can exhibit enhanced properties due to nanoscale effects and combine different properties from individual components. At present, scale effects on the mechanical behavior of multilayers are not well …
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Local Adaptive Slicing for Layered Manufacturing
Existing layered manufacturing systems fabricate parts using a constant build layer thickness. Hence, operators must compromise between rapid production with large surface inaccuracies, and slow production with high precision, by choosing between thick and thin build layers, respectively. Adaptive …
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The Effect of Process Parameters and Surface Condition on Bond Strength between Additively Manufactured Components and Polymer Substrates
… conducted on two levels and three factors, viz., layer thickness, surface roughness, and raster angle to examine the underlying effects on bond strength. Analysis of variance (ANOVA) was used to test the resultant index and distributions were plotted to analyze various conditions. Experimental …
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Solution of the laminar boundary layer of a semi-infinite flat plate given an impulsive change in velocity and temperature
The laminar boundary layer over a semi-infinite flat plate which is impulsively set in motion in an incompressible fluid and which has a simultaneous step change in surface temperature was studied. An approximate method was derived which can be used to determine the thermal boundary layer thickness …
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An analysis of differences in glass cartridge siliconization parameters and processes for manufacturing of pharmaceutical cartridges
… replaces manual injection. A minimum silicone layer thickness of 40nm is required to produce low gliding forces of approximately two Newtons with little variability. Differences seen in final gliding forces across production areas at Sanofi Insulin Frankfurt are small, but this variation makes …
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Atomistic simulations of deformation in Metallic Nanolayered Composites
<p>"The mechanical behavior of Metallic Nanolayered Composites (MNCs) is governed by their underlying microstructure. In this dissertation, the roles of the interlayer spacing (grain size, d) and the intralayer biphase spacing (layer thickness, h) on mechanical response of Cu/Nb MNCs are examined …
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The Electrical Properties And Microstructure Of An Ion Beam Mixed Metal-Polymer System
… implanting through a thin metal film. The metal layers are evaporated on the polymer substrate surface before ion implementation. A 50keV, nitrogen ion beam with a dose in the range of 10¹⁶ ions/cm² and a dose rate current of 100 and 200 uAmp mixes the metal and polymer at the interface. The …
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Impedance spectroscopy response of aluminum-copper-silicon alloys
… treatment on the polarization resistance, oxide-layer/double-layer capacitance, open circuit potential and breakdown potential of Al-Cu-Si alloys was evaluated. Electrochemical impedance spectroscopy and DC polarization techniques were combined with mechanical property evaluations to determine …
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Study of intermetallic compound layer formation, growth and evaluation of shear strength of lead-free solder joints
… known to affect solder joint reliability is the thickness of intermetallic compound (IMC) layer formed between the solder and the substrate. Although the formation of an IMC layer signifies good bonding between the solder and substrate, its main disadvantage is that it is also known to be the …
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Effect of feed temperature on the performance and properties of the NF270 membrane
… of the membrane: pore radius, effective active layer thickness, and volumetric charge density. From 25°C to 40°C, the fitted parameters showed a 29% increase in pore size, and an 84% increase in effective active layer thickness; volumetric charge density increased in magnitude by approximately …
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