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 24 for “"Lubricity"”.
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Application of Optical Detection Methods for Top-of-Rail (TOR) Lubricity Evaluation on a Moving Platform for Revenue Service Track
… of optical detection techniques to ascertain the lubricity of revenue service track from a moving platform for railroad applications. A literature review is presented that covers the rail vehicle dynamics that drive the need of Top-of-Rail lubrication and directly affect the manner in which the …
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The Application of Laser Technology for Railroad Top of Rail (TOR) Friction Modifier Detection and Measurements
… sensors for the purpose of determining rail lubricity of top-of-rail friction modifier is investigated in this research. A literature review of optical sensors as they relate to detecting thin layers is presented, as well as a literature review of the significant aspect of surface roughness …
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Avaliação de ésteres etílicos como aditivo à gasolina
… cycle engine and the effect of additives on fuel lubricity. Characterization analyzes were made according to ASTM and ABNT standards. The lubricity tests were carried out using a HFRR (High Frequency Reciprocating Test Rig) equipment, according ASTM D6079 standard. The analyzes of fuel consumption …
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Tribopolymerization as an approach to two-stroke engine lubrication
… this study, other existing and rising fuel lubricity problems have been investigated. The poor friction and wear characteristics of diesel, jet, and alcohol fuels have led to tribological problems in various engine fuel system components. The outstanding anti-wear performance of monomer …
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Fabrication and tribology of composite coatings incorporating solid lubricant micro-reservoirs
… tests and it was found that the frictional lubricity of the indium coating was lost at high temperatures (above 600°C). X-ray photoelectron spectroscopy (XPS) was conducted on the surfaces of the tool inserts after dry cutting, and it was found that some indium was still present. Based …
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Emissions and operational aspects of methanol as an alternative fuel in a stationary gas turbine
… additives were found to improve methanol's lubricity to equal that of aviation kerosene, with as little as 1% additive. The lower heating value of methanol required modifications to the WVU gas turbine's fuel system and atomizer, to provide higher flow rate of fuel then required with …
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Investigations of the Tribological Effects of Engine Oil Dilution by Vegetable and Animal Fat Feedstock Biodiesel on Selected Surfaces
… of the biodiesel play a role for providing good lubricity when mixed with the engine oil in the tested condition and animal feedstock biodiesel perform better than that of vegetable feedstock biodiesel.
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The Effect Of Biodiesel Blends On A Multi-Cylinder Engine And The Impact On Aftertreatment
… such as cetane number, oxidative stability, and lubricity made from different feedstocks to be used for engine testing. The evaluations of these selected fuels are then blended with ULSD and tested in single and multi-cylinder engines. The proceeding work specifically focuses on results from a …
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Control of surface structure and properties of responsive hydrogel interfaces via electrostatic interactions
… stiffness and charge, and ultimately, its lubricity. Unlike neutral hydrogels, where increased water content correlates with reduced friction, salts introduce additional dissipation mechanisms that can dominate over hydration effects, offering enhanced control of functional behavior. …
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Tending towards Non-fouling: A study of the interaction between proteins and surfaces prepared by radio frequency glow-discharge plasma
… protein adsorption while maintaining syringe lubricity. Overall, this research showcases the ability of RF glow-discharge plasma technology to create a variety of non-fouling surfaces that prevents protein adsorption and can be easily clinically translated for a variety of medical applications.
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The Boundary Lubricated Friction and Wear of Low Alloy Steel
… to act as a surface oxidation inhibitor and as a lubricity enhancer, particularly in the case of the higher (1000 ppm) concentration. Wear was found to be due to a mild oxidational mechanism at low additive concentrations and a more severe metallic mechanism at higher concentrations with evidence …
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Surface Friction and Spectroscopic Probes of New Physics with Trapped Ions
… to a reduction in friction termed quantum lubricity. Attempts at seeing quantum tunneling via static Rabi oscillations are described. While no smoking-gun signature of tunneling was repeatable, the suppression of quantum tunneling behavior is attributed to certain technical limitations of …
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Feasibility of using power steering pumps in small-scale solar thermal electric power systems
… performed best when moving fluids with more lubricity. The optimal pump was selected based on how the pump efficiency affected the overall ORC system efficiency, defined as the electrical work output divided by the heat input, and the net electric power output. Power steering pumps achieved …
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The widow's might: Law and the widow in British fiction, 1689-1792.
… Satirical treatments both mock the widow's lubricity and apprehend a re-allocation of property through remarriage. Conduct manuals advocate the strictest modesty to contain the widow's energy. The thesis elucidates, within the context of these representations, the legal and historical …
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Accurate Wheel-rail Dynamic Measurement using a Scaled Roller Rig
… the angle of attack, wheel and rail surface lubricity condition (i.e., wet vs. dry rail), and wheel wear, to study their effect on wheel-rail contact mechanics and dynamics. The wheel-rail contact is in between a one-fourth scale AAR-1B locomotive wheel and a roller machined to US-136 rail …
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Development Of Titanium Nitride/molybdenum Disulphide Composite Tribological Coatings For Cryocoolers
… envisioned as having the desired combination of lubricity and structural integrity. Extremely hard coatings of TiN and DLC were chosen to provide good wear resistance and MoS2 was chosen as the lubricating phase as it provides excellent solid lubricating properties due to its lamellar crystal …
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Computational Study of Low-friction Quasicrystalline Coatings via Simulations of Thin Film Growth of Hydrocarbons and Rare Gases
… structure will reduce the self-lubricity of the coatings. In this manuscript, we report the results of simulations on thin films growth of selected hydrocarbons and rare gases on a decagonal Al$_{73}$Ni$_{10}$Co$_{17}$ quasicrystal (d-AlNiCo). Grand canonical Monte Carlo method …
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Integrated Experimental and Computational Design of Alloys for Wear and Corrosion Resistance Across the Temperature Spectrum
… between 600°C and 900°C. The superior lubricity was attributed to the structural incommensurability between AO4 and BO6 layers within the oxide, as well as shear-induced phase transformations during wear, offering a novel mechanism distinct from conventional solid lubricants. This work …
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Soft hydrated sliding interfaces as complex fluids
Hydrogel surfaces are biomimics for sensing and mobility systems in the body such as the eyes and large joints due to their important characteristics of flexibility, permeability, and integrated aqueous component. Recent studies have shown polymer concentration gradients resulting in a less dense …
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