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 “"Metal-to-metal"”.
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On developing a graphitic white iron for metal-to-metal wear systems
… addressed heat dissipation issues related to the adhesive wear observed in metal-to-metal wear systems, by developing a graphitic white iron to increase thermal diffusivity of the wear components. One of the premium materials commonly used in current metal-to-metal wear systems is …
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Structural and residual strength analysis of metal-to-metal adhesively bonded joints.
The aim of this study is to propose a new simulation/experimental methodology to assess the residual strength of defective adhesive bonds. This incorporates defect detection in adhesive bonds and quantification of the effect of these defects on the adhesive bond failure. Finite element analysis …
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Numerical models for scoring failures of flexible metal to metal face seals
The flexible metal to metal face seals (FMMFS) has unique features including much more flexibility in the circumferential direction than in the radial direction, identical rotating and stationary seals, and a loading mechanism using elastomeric rings. This thesis work is the first attempt to …
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The effects of thin polymeric surface films on fretting corrosion
The main purpose of this research is to determine if polymer films can prevent fretting between two metals, and if they can, what the protection mechanisms are. This research is a part of fretting corrosion studies currently funded by the Army Research Office. Four thermoplastic polymers were …
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Micro-cleaved ridge lasers for optoelectronic integration on silicon
This thesis addresses one of the last hurdles to optoelectronic integration on silicon, namely the incorporation of room-temperature, electrically-pumped edge-emitting laser diodes. To this end, thin (-6 pm) InP-based multiple quantum well (MQW) ridge laser platelets emitting at a wavelength of …
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OCTG Premium Threaded Connection 3D Parametric Finite Element Model
… helical threads and boundary conditions required to simulate make-up and service loading. A methodology is developed to create a 360 degree full 3D parametric finite element model with helical threads as an effective design and analysis tool. The approach is demonstrated with the creation of a …
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Indigenous Resource Management and Environmental Contamination
Heavy metals are potential contaminants which can produce negative impacts on human health which vary from metal to metal, and are also dependent upon concentration and duration of exposure to the contaminant. This study lists the human health effects of 5 heavy metals; copper, arsenic, cadmium, …
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Effects of piston design and lubricant selection on reciprocating engine friction
The interaction between the piston and the liner in a reciprocating engine is of much interest because it affects reliability, noise, and efficiency. This study evaluated various changes to the piston skirt with the specific goal of minimizing friction. An analytical model of the piston, previously …
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RF Ohmic MEMS Switches Utilizing Printed and Carbon Based Nanomaterials for Space Applications
This thesis is devoted to the development of Radio Frequency (RF) Ohmic (metal-to-metal contact-type) MEMS (micro-electro-mechanical-systems) Switches for Space Applications. Ohmic contact devices void of any dielectric layer are considered exclusively in order to avoid the possibility of …
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Functionalization and applications of carbon nanotubes
… In this thesis, we explore strategies to functionalize CNTs as well as applications which are enabled by functionalized CNTs. Chapter 1 gives an overview of emerging applications of CNTs. In Chapter 2, we describe a route that leads to highly water-soluble multi-walled CNTs (MWCNTs). …
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Exploring the mechanisms critical to the operation of metal face seals through modeling and experiments
This thesis aims to explore operation mechanisms of a special type of mechanical face seals: the flexible metal-to-metal face seal (FMMFS). Unique features of the FMMFS include much more flexibility in the circumferential than in the radial direction, identical rotating and stationary seal rings, …
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Synthesis and Characterization of Nitrile Containing Polysiloxanes and Their Corresponding Networks as Aircraft Sealant Materials
… were prepared with cyanopropyl substituents to lower any propensity for the materials to swell in hydrocarbon fuels and to improve adhesion to metal substrates. 1,3,5,7-tetramethyl,1,3,5,7-tetrahydrocyclotetrasiloxane (D4H) was hydrosilated with allyl cyanide to yield the corresponding …
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A Comprehensive Integrity Monitoring System for Bolted Flange Connections
Bolted flange connections are commonly utilized to link pressure vessels and pipeline systems. Although there exists a series of design codes and standards to specify the design of flange joints, multiple adverse factors, such as unexpected loads and excessively high pressures and temperatures, can …
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Ultrafast electron transfer and intersystem crossing in bimetallic molecules
… the role of electron spin is an important topic in electron transfer (ET). Coupling between the electronic, spin, and nuclear degrees of freedom play an important role in driving ET and intersystem crossing (ISC) on the ultrafast timescale. In this thesis, ultrafast optical and X-ray …
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Analysis, design, fabrication, and testing of a MEMS switch for power applications
… of single-switch cells, and a parallel transistor-based protection circuit for arcless switching. Such a system design enables the switch development to focus on a normally-open single-pole-single-throw modular MEMS switch cell, which operates under coldswitching conditions. This leaves …
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The Synthesis and Photophysical Properties of New Polymetallic Complexes Designed for Use in Photoinitiated Electron Collection
The goal of this research was to develop stereochemically defined multimetallic systems for use as light absorbers and electron donor / light absorber dyads in photoinitiated electron transfer and electron collection. The basis for the stereochemical control was provided by the symmetric bridging …
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Investigating adsorption characteristics of Delonix regia for heavy metals removal in wastewater and its potential for remediating contaminated soils
There is need to explore all possible agro-based inexpensive adsorbents and study their feasibility for heavy metal removal with the aim of finding which is a better alternative to activated carbon. The focus of the present study is on investigating the adsorption characteristics of Delonix regia …
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New Polyazine-Bridged Ru(II),Rh(III) and Ru(II),Rh(I) Supramolecular Photocatalysts for Water Reduction to Hydrogen Applicable for Solar Energy Conversion and Mechanistic Investigation of the Photocatalytic Cycle
The goal of this research is to test the design constraints of active dpp-bridged RuII,RhIII (dpp = 2,3-bis(2-pyridyl)pyrazine)) supramolecular photocatalysts for water reduction to H2 and provide mechanistic insights into the catalytic cycle. Two member of a new RuII,RhIII motifs with only one …
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Synthesis and Study of Polyazine Bridged Mixed Metal Dyads: Electrochemical, Photophysical, and Photochemical Properties of a New Supramolecular Architecture
A series mixed metal supramolecular complexes were synthesized and studied by electrochemistry, photophysics and photochemistry. The complexes consisted of a single RuII or OsII polyazine light absorber bound to a cis-RhIIICl2 moiety through a polyazine bridging ligand. A related class of …
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Development of nano composite coatings for enhanced performance in non-conventional lubricants under sliding contact.
… small scale industrial applications and automobiles are artificially formulated. Although artificially formulated refrigerants have excellent thermodynamic properties, but the use of man-made chemical compounds have damaged the earth’s atmosphere either by depleting the ozone layer or by …
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