Browsing Science (Faculty of) by Title
Now showing items 2875-2894 of 3026
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Tracing galaxy evolution through the reconstruction of their star formation histories
(University of Waterloo, 2023-05-24)This thesis studies the star formation histories (SFHs) of galaxies in order to understand the nature of 'quenching.' The suppression of star formation, i.e., quenching, over the history of the Universe results in a growing ... -
The Tracing of a Contaminant (Tritium) from Candu Sources: Lake Ontario
(University of Waterloo, 1997)In any research program we begin with a hypothesis and when our expected results do not concur with the observed results we must try and understand the dynamics behind the changed process. In this study we were trying ... -
Tracing Redox Cycles during Microbe-Clay Interactions Using Stable Iron Isotopes
(University of Waterloo, 2018-10-17)Iron redox cycling, especially Fe(III) reduction, is mostly driven by microbial activity in the shallow subsurface. A wide range of bacteria, archaea, and fungi reduce Fe(III) to acquire energy with soil organic compounds ... -
Tracing the molecular and evolutionary determinants of novel functions in protein families
(University of Waterloo, 2010-03-29)This thesis explores the limits of homology-based inference of protein function and evolution, where overall similarity between sequences can be a poor indicator of functional similarity or evolutionary relationships. Each ... -
Traditional Methods and New Fluorometric Methods to Determine Phytoplankton Nutrient Status for Freshwater Ecosystems, and Their Application in the Lower Laurentian Great Lakes
(University of Waterloo, 2009-10-01)The Laurentian Great Lakes are the largest system of freshwater on earth containing 22% of the world’s supply. Although part of a single system, each lake shows substantial variation regarding physical, chemical and ... -
Transactivation of platelet-derived growth factor receptor type β: Mechanisms and potential relevance in neurobiology
(University of Waterloo, 2013-12-23)In the absence of ligand, certain growth factor receptors can be activated via G protein-coupled receptor (GPCR) activation in a process termed transactivation. Serotonin (5-HT) receptors can transactivate the receptor ... -
Transcriptional regulation of North American wood frog (Rana sylvatica) dorsal skin during development and in response to chronic exposure to a microplastics mixture
(University of Waterloo, 2024-02-09)Amphibian populations have been experiencing declines globally for decades due to factors such as habitat loss, invasive species, climate change, overexploitation, pollution, and disease. Skin is an important immune organ ... -
Transfer Cavity Stabilization Using the Pound-Drever-Hall Technique with Noise Cancellation
(University of Waterloo, 2011-01-24)A system for exciting Rubidium atoms to Rydberg states has been constructed to study the interactions between them and metal surfaces. This thesis describes a method to reach the f Rydberg series using diode lasers. Since ... -
Transient episodes of mild environmental oxygenation and oxidative continental weathering during the late Archean
(American Association for the Advancement of Science, 2015-11-20)It is not known whether environmental O2 levels increased in a linear fashion or fluctuated dynamically between the evolution of oxygenic photosynthesis and the later Great Oxidation Event. New rhenium-osmium isotope data ... -
Transition Galaxies: The Evolution of Environmental Quenching
(University of Waterloo, 2021-05-28)We study the evolution of environmental quenching using a photometric selection of transition galaxies in GOGREEN- which encompasses clusters between 1<z<1.5 spanning a wide range in halo mass. We split the galaxies in ... -
Transition Matrix Monte Carlo Methods for Complex Systems
(University of Waterloo, 2019-04-15)The aim of this thesis is to develop efficient transition matrix Monte Carlo simulation methods for complex systems(e.g., spin glasses) that enable one to construct the transition matrix from which the density of states ... -
Transition to light-like trajectories in thin shell dynamics
(Elsevier, 2018-11)It was recently shown that a massive thin shell that is sandwiched between a flat interior and an exterior geometry given by the outgoing Vaidya metric becomes null in a finite proper time. We investigate this transition ... -
Transport and Retention of Particulate Organic Matter in Riverbed Sediments: Laboratory Experiments and Modelling
(University of Waterloo, 2022-09-22)Infiltration of river water into riverbeds can deliver particulate organic matter (POM: the remains of plants, algae, and other life), which has an important role for transforming nutrients in watersheds. Once POM is ... -
Transport of chloride and deuterated water in peat: The role of anion exclusion, diffusion, and anion adsorption in a dual porosity organic media
(Elsevier, 2019-08)The dual-porosity structure of peat and the extremely high organic matter content give rise to a complex medium that typically generates prolonged tailing and early 50% concentration breakthrough in the breakthrough curves ... -
Treatment of a PHC Source Zone using Land Application of Sulfate
(University of Waterloo, 2015-02-23)This pilot-scale experiment was performed in the sand pit area at the University of Waterloo Groundwater Research Facility at CFB Borden located near Alliston, ON. A multicomponent PHC source zone (3 m x 3 m) was emplaced ... -
Treatment of Water-borne Nutrients, Pathogens, and Pharmaceutical Compounds using Basic Oxygen Furnace Slag
(University of Waterloo, 2013-09-27)Phosphorus (P) is one of the essential nutrients for living organisms; however, excess P in aquatic systems often causes environmental and ecological problems including eutrophication. Removal of P from domestic wastewater, ... -
Trophic disruption effects on the diet and condition of Lake Whitefish
(University of Waterloo, 2010-01-18)Recently, the growth and condition of Lake Whitefish (Coregonus clupeaformis), an important commercial fishery commodity, has declined in some areas of the Great Lakes. As Lake Whitefish are benthic feeders, historically ... -
THE TULU KAPI GOLD DEPOSIT OF THE WESTERN ETHIOPIAN SHIELD: STRUCTURAL FRAMEWORK, U-PB ZIRCON GEOCHRONOLOGY AND PARAGENESIS
(University of Waterloo, 2019-04-10)Gold production dates back millennia in the Arabian Nubian Shield. Most of the mined deposits are in the northern portions of the shield, with little know about its southern extent. Tulu Kapi is a rare example of a gold ... -
Tunable Coupler in Superconducting Circuits and Impedance Engineering for Josephson Parametric Amplifier
(University of Waterloo, 2020-09-04)In this thesis, we study two topics on superconducting circuits. The first topic is the tunable coupler for resonators. This coupler is implemented with a superconducting circuit coupling with resonators in the dispersive ... -
Tunable covalent organic framework electrochemiluminescence from non-electroluminescent monomers
(Elsevier, 2021-10)It is hard to find new electrochemiluminescence (ECL) luminophores using existing research strategies, especially from ECL non-active monomers. Here, fully conjugated covalent organic frameworks with trithiophene (BTT-COFs) ...