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.
Results
Showing 1 to 20 of 50 for “"Surface Contact"”.
-
Electrifying the streets : the surface-contact controversy in five English towns 1880-1920
… debates, five towns in England opted for the surface-contact system. Of these, Wolverhampton and Hastings are the main focus for this research because they occupy opposite ends of the social and political spectrum. Lincoln, Torquay, and Mexborough, where surface-contact traction survived for …
-
Atomic force microscope cantilever with reduced second harmonic frequency during tip-surface contact
… to the first mode frequency, for operation in contact with a substrate. A freely-resonating paddle internal to the cantilever reduces the stiffness of the second flexural mode relative to the first while nearly maintaining the mass of the original cantilever. This strategy allows the ratio of …
-
MULTI-SCALE DYNAMICS OF MECHANICAL SYSTEMS WITH FRICTION
Contact between rough surfaces occurs in numerous engineering systems and in many instances influences the macro behavior of the system. In many instances, the interaction between rough surfaces, affect the macro behavior of the system. Effective treatment of systems containing rough surface …
-
Testing and Understanding Screwdriver Bit Wear
… of the fundamentals of the bit/screw surface contact and its effect on force distribution. This thesis focuses on three areas. First, understanding how the tool and bit are used, and what factors contribute to bit wear. With this understanding, a test rig has been designed to emulate …
-
Control of AFMs in contact mode
… Force Microscope (AFM) is a high precision surface characterization tool commonly used in Nano-technology, Bio-technology, semiconductors, MEMS, and life sciences' applications. As most versatile systems, AFM offers little guarantees on achieving repeatable satisfactory operation. This is …
-
Development of a Novel Grease Resistant Functional Coatings for Paper-based Packaging and Assessment of Application by Flexographic Press
… materials are made. SEM images along with contact angle data suggest that coating performance is probably attributable to decreased mean pore size in conjunction with a slightly increased surface contact angle facilitated by crosslinking of PVA molecules by both borate ions and ACDA.
-
Sensitivity Analysis and Optimization of Multibody Systems
… and optimization capabilities. Several different contact and friction models, which can be used to model point contact and surface contact, are developed and included in MBSVT. Finally, this study employs reference point coordinates and the penalty formulation to perform dynamic analysis for the …
-
A microvillus based approach to model cell rolling
… relation which allows shear modulation of cell-surface contact area. The model showed excellent agreement with experimental results over a wide range of shear stresses. Using the model, the effects of cell deformability and microvillus structure have been studied and its implications discussed. …
-
Effects of crack-crystallite interaction on the fracture behavior of a cordierite glass-ceramic
… finer-grained (< 0.1 µm) crystalline matrix. Surface damage was simulated by the Vicker's microhardness technique, with indentations being made over a wide load range to duplicate varying degrees of severity in the contact events. Direct measurement of the indentation flaws was made by …
-
Simulation approach to understanding materials in contact
… for the enhanced development of electrical contacts. Additionally, techniques for obtaining real data to validate the methods being explored are provided.<br /> The focus is on developing a novel model to accurately simulate the contact area resulting from elastic-plastic deformation on …
-
Local Charging Behavior on GaN Surfaces
… high-frequency devices. The nature of the GaN surface and its electrical characteristics can impact the performance of such devices. In this study, several GaN surfaces are locally charged using an atomic force microscope, and then subsequently studied by measuring the surface potential with …
-
Design for assembly : a computational approach to construct interlocking wooden frames
… consists of short members spanning on a large surface where members lock each other at their mid-spans by simple notches. Such a system should be designed with consideration of its assembly sequence, as a static interlocking form may be described but impossible to assemble in any sequence. …
-
Musculoskeletal Modeling of The Human Elbow Joint
… of ligament, and muscle forces, and cartilage contact pressures during elbow activities is not possible. Therefore, computational models needs to be employed for prediction. A dynamic computational model in which muscle, ligament and articular surface contact forces are predicted concurrently …
-
Experimentation of Mode I and Mode II Fracture of Uni-Directional Composites and Finite Element Analysis of Mode I Fracture Using Cohesive Contact
… as to studying the success of cohesive surface contact for accurately modeling coupon level fracture testing. Cohesive contact interaction in Abaqus/Standard was used to simulate the mode I double cantilever beam (DCB) experiment of ASTM D5528. Cohesive contact was found to accurately …
-
Rough Surface Interactions of Micro/nano-Scale Contact Systems
… major issues of miniature systems in regards to contact behavior have been studied. First, nanomechanical properties of ultra-thin carbon films such as hardness and elastic modulus have been investigated using a newly developed nanoindentation technique and custom-built high-resolution …
-
Laser speckle photography for surface tampering detection
It is often desirable to detect whether a surface has been touched, even when the changes made to that surface are too subtle to see in a pair of before and after images. To address this challenge, we introduce a new imaging technique that combines computational photography and laser speckle …
-
Characterization of anodic bonding
… A novel process recipe, requiring a SiC RMS surface roughness of 45nm, was developed for anodically bonding CVD SiC to bulk and thin-film, lapped Pyrex[TM] and Hoya SD-2[TM] glass substrates. The bond quality, residual curvature, and microstructured interfacial features for CVD SiC anodic …
-
Simulation Modeling of Karst Aquifer Conduit Evolution and Relations to Climate
… growth. Rather, the quantity and duration of surface contact between water and the conduit walls combined with dissolution rates to affect the total growth. The amount of wetted perimeter (contact between fluid and passage floor/walls) generated by specific conduit to capacity were shown to be …
-
Impact of slickwater fracturing fluid compositions on the petrophysical properties of shale and tightsand
… added to reduce water block by providing a low surface tension. However, the effect of the surfactant on the petrophysical properties of tight rocks is not clear.</p> <p>In this dissertation, the following four researches have been carried out, and significant findings have been summarized in …
-
Guided Wave Actuation for Enhanced Damage Identification in Carbon Fiber Reinforced Polymer Material Using Electrical Resistance Tomography
… a non-destructive evaluation technique that uses surface voltage measurements with electric currents injections in the material to measure electrical conductivity changes induced by damage. Accurate and efficient damage identification in CFRP composites using ERT with hardware limitations on …
Page 1 of 3