Browsing Theses by Title
Now showing items 6856-6875 of 15522
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Hydraulic Variable Valve Actuation on a Single Cylinder Engine
(University of Waterloo, 2017-12-19)The combustion characteristics in an engine cylinder can greatly change over a range of speeds and loads. However, conventional engines x the timing and amount of intake and exhaust, which can lead to higher emissions, ... -
Hydraulic Variable Valve Actuation System: Development & Validation
(University of Waterloo, 2019-08-27)Conventional engines with camshafts with fixed timings force a compromise between performance at high engine loads and fuel economy at low engine loads. Adjusting internal combustion engine valve timing and lift through a ... -
Hydraulic Variable Valve Timing Testing and Validation
(University of Waterloo, 2016-06-30)This thesis documents the development of a fully continuous, hydraulics-based variable valve timing system. This hydraulics based variable valve timing system is capable of controlling an engine valves lift height and ... -
Hydride Generation as a Sample Introduction Technique for Detection of Arsenic by Microplasma
(University of Waterloo, 2023-12-08)Microplasma can be used as a portable analytical instrument for elemental analysis of samples due to their small size, low power consumption, low carrier gas consumption, and low cost. This is specifically important for ... -
Hydro-Solar Fields
(University of Waterloo, 2010-09-28)In the current context of escalating climate catastrophes paralleled with depleting energy resources, degrading fresh water supplies and diminishing agricultural lands, there is an increasing preoccupation with the prospects ... -
Hydrobiogeophysics: Linking geo-electrical properties and biogeochemical processes in shallow subsurface environments
(University of Waterloo, 2018-12-13)Microbially mediated reactions drive (bio)geochemical cycling of nutrients and contaminants in shallow subsurface environments. Environmental forcings exert a strong control on the timing of reactions and the spatial ... -
The Hydrochemical Fate and Transport of Treated Domestic Wastewater Contaminants During a Wastewater Polishing Experiment in a Sub-Arctic Ladder Fen Peatland
(University of Waterloo, 2016-09-27)Protecting northern aquatic ecosystems is critical to ensuring the sustained use of these environments; however, with increasing industrial and residential development pressures in this region the safe and effective treatment ... -
Hydrodesulfurization and Hydrodenitrogenation of Model Compounds Using in-situ Hydrogen over Nano-Dispersed Mo Sulfide Based Catalysts
(University of Waterloo, 2010-10-29)Heavy oil derived from oil sands is becoming an important resource of energy and transportation fuels due to the depletion of conventional oil resources. However, bitumen and heavy oils have a low hydrogen/carbon ratio and ... -
Hydrodesulphurization of Light Gas Oil using Hydrogen from the Water Gas Shift Reaction
(University of Waterloo, 2009-08-25)The production of clean fuel faces the challenges of high production cost and complying with stricter environmental regulations. In this research, the ability of using a novel technology of upgrading heavy oil to treat ... -
Hydrodynamic Modeling of Dielectric Response in Graphene and Carbon Nanotubes
(University of Waterloo, 2006)This thesis studies two important carbon structures, graphene and carbon nanotubes, with the purpose of understanding how their three-dimensional electron density distribution affects the way fast ions interact with them. ... -
Hydrodynamic Modelling of the Electronic Response of Carbon Nanotubes
(University of Waterloo, 2007-02-08)The discovery of carbon nanotubes by Iijima in 1991 has created a torrent of new research activities. Research on carbon nanotubes ranges from studying their fundamental properties, such as their electron band structure ... -
Hydrodynamic Stability of Free Convection from an Inclined Elliptic Cylinder
(University of Waterloo, 2006)The steady problem of free convective heat transfer from an isothermal inclined elliptic cylinder and its stability is investigated. The cylinder is inclined at an arbitrary angle with the horizontal and immersed in an ... -
The Hydrodynamics of Pool-Riffle Sequences with Changing Bedform Length
(University of Waterloo, 2011-08-23)Previous research has demonstrated that pool-riffle bedforms play a critical role in channel stability and ecosystem health in many natural gravel-bed channels. Although the bedform length is known to scale with channel ... -
Hydrodynamics of the Yucatan peninsula carbonate aquifer: surface flow, inland propagation and mixing
(University of Waterloo, 2021-04-28)This thesis is a collection of three investigations into the hydrodynamics and hydrogeology of the Yucatan Peninsula, Mexico. The first investigation models potential mangrove-groundwater interactions as a box model. We ... -
The hydrodynamics of two-dimensional oscillating flows over ripples: the effect of asymmetries in ripple shape and currents
(University of Waterloo, 2017-04-28)The research presented in this thesis involved consideration of three increasingly asymmetric oscillatory flows over two ripple profiles, one of which is asymmetric and represents a small deviation from a symmetric ripple. ... -
Hydrogel Composite Adhesives Inspired by Algae and Mussels
(University of Waterloo, 2019-09-25)The ocean is a vast source of a multitude of materials used in daily life, but has also provided numerous sources of inspiration for creating novel bio-inspired materials. Marine mussels are one of the best-known marine ... -
A Hydrogel Microneedle-Assisted Assay Integrating Aptamer Probes and Fluorescence Detection for Reagentless Biomarker Quantification
(University of Waterloo, 2022-05-11)Analyzing interstitial fluid (ISF) via microneedle devices enables patient health monitoring in a minimally invasive manner and at point-of-care settings. However, most of the MN-based diagnostic approaches require complicated ... -
Hydrogel-Based Flexible Electronics Devices as Human Motion Sensors and Triboelectric Nanogenerators
(University of Waterloo, 2024-02-02)Flexible electronics is an emerging discipline in recent years because of its outstanding flexibility. It can be adapted to particular scenarios such as folded or bent, where conventional electronics are complex to apply. ... -
Hydrogen and Carbon Monoixde Electrochemical Oxidation Reaction Kinetics on Solid Oxide Fuel Cell Anodes
(University of Waterloo, 2013-08-30)Solid oxide fuel cells (SOFCs) are promising power generation devices due to its high efficiency and low pollutant emissions. SOFCs operate with a wide range of fuels from hydrogen (H2) to hydrocarbons, and are mainly ... -
A Hydrogen Hybrid Powertrain for the Union-Pearson Railway
(University of Waterloo, 2019-09-10)Canadian legislation attempts to regulate particle emissions released from the rail transportation sector. Assessment of the impact of rolling stock is the key to perform such regulations. Different strategies have been ...