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 31 for “"frictional resistance"”.
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Frictional resistance of concrete on a geocomposite material
The frictional resistance provided by the underlying layers of a concrete slabs on ground has a large influence on the cracking behavior. To adequately judge the quality of performance of the slabs, it is imperative to investigate the frictional resistance to movement and other relations of the …
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Reducing Frictional Resistance between Orthodontic Bracket and Arch Wire
… a proposed clinical method for decreasing frictional resistance between an orthodontic bracket and an archwire during usage of the continuous edgewise method of space closure. It was hypothesized that altering the leading edge of the bracket (in the direction of retraction) would …
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Investigation of frictional resistance on orthodontic brackets when subjected to variable moments
… were measured. Dynamic friction was the frictional force that occurred when the applied force was variable (dynamic load). The results showed that static and kinetic friction were similar while dynamic friction was statistically greater. The Minitwin and Transcend 6000 brackets produced …
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Lime treatment to improve frictional resistance and stability of stiff clay slopes
… particles must be realized to increase drained frictional resistance. Lime-soil reactions that may produce less platy and larger soil particles begin and continue with time under the highly alkaline pH environment. In this study, measurements of pH as an indicator of chemical environment, …
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Local Motions in Proteins as Investigated by the Thermal Coefficient of the Frictional Resistance to Rotation (Protein Dynamics, Fluorescence, Viscosity)
The thermal coefficient of the viscosity (b) was measured through the fluorescence polarization of tryptophan and tyrosine both free in solution and as intrinsic protein chromophores. For free fluorophores it was found: (1) b is a function of the solvent only and is independent of the probe used in …
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The effect of archwire vibrations on the stick-slip behavior of the bracket-archwire interface utilizing clinically relevant tipping moments
This study evaluated bracket-archwire frictional resistance as a function of ligation method and archwire vibration. In vivo archwire vibrations were measured to obtain frequencies and amplitudes for ex vivo testing. Active and passive ligation methods were compared for 9 vibration scenarios …
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Dynamics of biofilm processes in an annular reactor
… energy losses resulting from increased fluid frictional resistance and increased heat transfer resistance. The objective of this study was to investigate 1 the effect of substrate loading and fluid velocity on the processes associated with fouling biofilm development. An Annular Fouling …
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The development of time-dependent biofouling model for ships
… research, the effect of barnacle fouling on the frictional resistance has a lack of systematical experimental investigation focussing on parameters such as size, coverage area and settlement pattern. Limited roughness functions data about barnacle fouling is available in the literature. Moreover, …
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Some studies of frictional properties of fabrics
The frictional (fricative) properties of some 23 fabrics are reported. These properties include frictional resistance, amplitude of resistance, number of peaks, difference between static and kinetic frictional resistance in addition to coefficients of friction, all determined by trace analysis. …
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Numerical Study of Fully Developed Laminar and Turbulent Flow Through Microchannels with Longitudinal Microstructures
… predictions show a reduction in the total frictional resistance as the cavity width is increased relative to the channel width, the channel height-to-width aspect ratio is decreased, and the vapor cavity depth is increased. The frictional resistance is also reduced with increased Reynolds …
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Predicting the Dynamics of Injection-Induced Earthquakes
… which in turn reduces the effective stress and frictional resistance of faults that maintain the fractured rock system in a state of mechanical equilibrium. Under certain conditions, sufficiently high pore pressure can lower this frictional resistance below a critical threshold and initiate an …
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From String to Structure: Graph Threading for Physical Assembly
… and assembly time, and minimizing turn to reduce frictional resistance during deployment. For the length metric, we present a polynomial-time algorithm via reduction to minimum-weight perfect matching, prove tight worst-case bounds on optimal threadings, and identify special cases with faster …
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A mathematical model of transient flow in pipeline filling
… smaller diameters or otherwise offering greater frictional resistance to the flow.
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Determination of Lateral Resistance of Deck Tie Fasteners in Smooth Top Bridge Girders
… design aids for the determination of lateral resistance capacity and spacing requirements of deck tie fasteners in curved railroad bridges with smooth top girders. In railroad bridge design, required lateral resistance dictates the spacing of deck tie fasteners. Currently, no provisions exist …
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An Urban Camp for Boat Building
… it closed almost hermetically, with a gentle frictional resistance and a barely audible sound of escaping air. It felt good working on this cupboard. Making the precisely fitting joints and exact shapes to form a whole, a complete object that corresponds to my inner vision, triggering in me a …
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Jamming transition and emergence of fracturing in wet granular media
… fracturing can be achieved either by decreasing frictional resistance. The balance between frictional, viscous, and capillary forces has been studied in experiments and simulations, and has helped understanding the underlying mechanisms for a wide range of phenomena, including fractures in drying …
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Characterization of new particulate MMC materials and bolted joints through applicable ASTM standards
… Also higher clamping force provides higher frictional resistance and lateral support as a result of which the ultimate failure of MMC increases even though the mode of failure remains the same.
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A Frictional Evaluation of a New Surface-Modified Titanium Orthodontic Bracket
… An accurate evaluation of an appliance's frictional properties enables a clinician to identify applications where the utilization of a new appliance may be advantageous. The aim of this study was to evaluate the frictional properties of this new surface-modified titanium orthodontic …
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Field observations of the early-age behavior of jointed plain concrete pavements
… history, material property development and frictional resistance. Minimal recommendations for corrects to the behavior were suggested.;The scope of the Phase II investigation was to perform extensive, continuous monitoring of the behaviors of newly constructed slab sections examining …
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Mechanical and geological controls on the long-term evolution of normal faults
… fault, which consists of (1) overcoming the frictional resistance on the fault, (2) bending the faulted layer and (3) sustaining the growth of topography. In Chapter 2, I propose that flexural rotation of the active fault plane enables faults to evolve along a path of minimal energy, thereby …
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