Digital Commons Network^™

Spatial And Temporal Variability Of The Snow Environment In The Western Canadian Arctic, Philip Mann

Theses and Dissertations (Comprehensive)

Snow cover in the Western Canadian Arctic is a significant input to the hydrological mass balance, it produces shelter and habitat for animals and humans, and supports interactions with vegetation and climate. The Arctic-tundra snow cover is greatly impacted by wind erosion, redistribution and deposition of snow during high wind events over the winter months. As a result, the end of winter snow cover is characterised by significant small-scale (on the order of a few meters) spatial variations in snow cover depth, density, and thus snow water equivalent (SWE), and runoff. Future climate related changes to snow cover depth and …

The Role Of Channel Fens In Permafrost Degradation Induced Changes In Peatland Discharge At Scotty Creek, Nt, Lindsay Elena Stone

Theses and Dissertations (Comprehensive)

Permafrost degradation in the peat-rich southern fringe of the discontinuous permafrost zone is producing substantial changes to land cover with concomitant expansion of permafrost-free wetlands (bogs and fens) and shrinkage of forest supported by permafrost peat plateaus. Predicting discharge from headwater basins in this region depends on understanding and numerically representing the interactions between storage and discharge within and between the major land cover types, and how these interactions are changing. To better understand the implications of land cover change on wetland discharge, the hydrological behaviour of a channel fen in the headwaters of Scotty Creek, Northwest Territories, Canada, dominated …

Landscape Scale Spectral-Temporal Modelling Of Bamboo-Dominated Forest Succession Within The Atlantic Forest Of Southern Brazil, Clara Greig

Theses and Dissertations (Comprehensive)

Tropical and subtropical ecosystems have become vulnerable to biological invasion (i.e., bamboo) due to human induced forest fragmentation. Bamboo ecological processes have been found to impede forest development, resulting in a state of arrested succession, which has been found to significantly reduce biodiversity, thus contributing to biotic homogenization. In this study we use a semi-empirical approach to develop a community-level spatially explicit ecological process model (hybrid model) using a time-series of Landsat imagery to describe single-landscape scale ecological processes of a pervasive bamboo species (Merostachys skvortzovii) found throughout the Araucaria forest, a critically threatened subtype of Atlantic forest …

Examining Parental Scaffolding In Computer Based Contexts As A Function Of Task Difficulty And Mobility Of Computer Device, Domenica De Pasquale

Theses and Dissertations (Comprehensive)

Technology is part of everyday life for most adults and children. Digital technologies allow children to engage with technology and the digital world earlier in their development than previously experienced (Orlando, 2011; Plowman, Stevenson, Stephen, & McPake, 2012). Two studies were conducted to explore joint media-based interactions of parents and their children. Parental views, age, gender, experience and familiarity with technology were considered in conjunction with parent-child interactions when engaged with stationary and mobile computers and when engaged with easy and difficult to navigate software. Study 1 employed self-report measures consistent with the wider body of literature available regarding early …

Three Essays On Contagion Risk In Supply Chain, Alireza Azimian

Theses and Dissertations (Comprehensive)

Firms often benefit when an unfavourable event befalls a rival, usually through a shift in demand. But sometimes negative events can adversely affect other firms in the industry, a phenomena referred to as contagion. While contagion can harm the supply chain by disrupting supply or demand, or increasing operating costs, it has not yet been studied in the area of supply chain risk management. Aiming to fill this gap, in the first essay I use real cases to conceptualize the process of contagion and apply related theories and literature to theorize the key factors contributing to contagion risk. The …

Spatial Modelling And Wildlife Health Surveillance: A Case Study Of White Nose Syndrome In Ontario, Lauren Yee

Theses and Dissertations (Comprehensive)

Wildlife data is often limited by survey effort, small sample sizes, and spatial biases associated with collection and missing data. These factors can create unique challenges from a surveillance perspective when trying to extract spatial patterns of habitat suitability and disease distributions for conservation and management purposes. This thesis examined data quality from a wildlife health database in the context of spatial analysis of wildlife disease. Spatial analysis of the data to predict habitat suitability of bats and white nose syndrome afflicted bats was examined by using the MaxEnt modelling method. Methods to reduce spatial bias were examined and specific …

The Effects Of Fire On Snow Accumulation, Snowmelt And Ground Thaw On A Peat Plateau In Subarctic Canada, Elyse Mathieu

Theses and Dissertations (Comprehensive)

During the past century, the highest rates of warming have occurred at latitudes above 60^oN, where air temperatures have risen at twice the rate of other regions. In northwestern Canada, this warming has coincided with an increase in the frequency, size and severity of wildfires. The influence of such fires on the trajectory of on-going permafrost thaw is not well understood. As a consequence, the combined impacts of climate warming induced permafrost thaw and possible feedbacks arising from wildfires cannot be properly assessed. This study examines the impact of a 2.7 ha low-severity wildfire (July 2014) on water …

Confronting Sexism In Science, Technology, Engineering, And Math (Stem): What Are The Consequences?, Eden J.V. Hennessey

Theses and Dissertations (Comprehensive)

Disparaging remarks that female scientists are ‘Distractingly Sexy’ (Waxman, 2015) and ‘Too Pretty to Do Math’ t-shirts (Amazon.com) highlight the common belief that women in science, technology, engineering and math (STEM) violate perceived gender norms. However, by confronting these beliefs, women may incur a ‘double-dose’ of hostility; once for being present in science, and again because of the confrontation itself (Kaiser & Miller, 2001). Across three studies, this research tested how women confronting sexism in STEM contexts would elicit and anticipate social costs. Study 1 showed that male participants rated a hypothetical female confronter in STEM higher in bossiness and …

The Role Of Indicators In Promoting Gender Equality Through The Millennium And Sustainable Development Goals, Sara Rose Taylor

Theses and Dissertations (Comprehensive)

With the global rise of evidence-based policy, indicators have become an increasingly important part of governance. Indicators are statistics that represent social experiences, turning complex norms into simplified representations. Although seemingly objective, indicators reflect the values and beliefs of the actors who create them. An indicator’s normative underpinnings have significant consequences for social governance and policy because of an indicator’s power to shape understanding. This multi-manuscript dissertation analyzes the impact of governance by indicators as seen in the Millennium and Sustainable Development Goals (MDGs and SDGs), two major United Nations initiatives in the field of global social governance. The focus …

The Effect Of Oxidation, Thionation, And Dimerization On The Self-Assembly And Photophysical Properties Of Novel Discotic Materials, Katie M. Psutka

Theses and Dissertations (Comprehensive)

This thesis aims to increase understanding of the relationship between molecular structure and liquid crystalline temperature range by exploring the effects of oxidation, thionation, and dimerization on the self-assembly and properties of novel discotic materials. First, two alkoxy-substituted dibenzanthracenequinones were prepared by oxidation of the corresponding dibenzanthracenes. The quinone induced a liquid crystalline phase in the hexaalkoxy dibenzanthracene derivative, but not in the tetralkoxy derivative. However, both of the resulting materials were un-reactive to any further synthetic modifications that could be used to improve their properties. In comparison, two heteroaromatic dithienoanthracenedicarboximides were successfully prepared, although the addition of the thiophene …

Tweeting Strategy: Military Social Media Use As Strategic Communication, Rupinder Mangat

Theses and Dissertations (Comprehensive)

Many Western militaries now actively engage with various social media platforms. The starting point for my dissertation research was this question: how does the military use social media? Considering the Canadian Armed Forces’ use of Twitter as a case study, I collected over 14,000 tweets from four Twitter accounts of the Canadian Armed Forces (CAF), the Canadian Army, the Royal Canadian Navy, and the Royal Canadian Air Force with some tweets as old as September 2012 and the most recent tweets from December 2015. I employed Grounded Theory Method to analyze these tweets, which revealed four themes — organization, history, …

Synthesis, Properties, And Solid-State Structures Of A Series Of 6,13-Dicyanoheteropentacene Analogues: Towards New Liquid Crystalline Materials, L Hiscock, Kenneth E. Maly, Louise N. Dawe

Theses and Dissertations (Comprehensive)

The focus of this thesis is the synthesis of novel heterocyclic pentacene analogs and the investigation of their self-organization for the development of new materials for organic electronics. The thesis consists of two interrelated projects: the first being development of an improved synthesis of a series of liquid crystalline dicyanotetraoxapentacenes (DCTOPs) while the second entails the exploratory synthesis of several novel dicyanoheteropentacene analogues and a preliminary investigation of their photophysical properties and solid-state structures. Both of these projects centre around the use of nucleophilic aromatic substitution reactions on tetrafluoroterephthalonitrile.

Soluble, tetrakis(bis(alkoxy)phenyl)-substituted DCTOPs were originally synthesised via a short synthesis complicated …

Near-Surface Permafrost Ground Ice Characteristics And Ecological And Physical Drivers Of Transient Layer Ice Content In Discontinuous Permafrost, Jason Paul

Theses and Dissertations (Comprehensive)

Accelerated climate warming in northern regions is causing permafrost degradation, leading to the reduction of the areal extent of permafrost. Permafrost is the foundation for many northern ecosystems and communities, so its thaw can have important ecological and societal consequences. Thaw of ice-rich permafrost can cause subsidence of the ground surface proportional to excess ice content. Terrain settlement can cause ponding or damage to infrastructure. Following a surface disturbance that removes much of the vegetation cover, a shift in the ground thermal regime can cause an increase in active layer thickness and rapid thaw of the top portion of permafrost. …

Predicting Credit Ratings With Statistical Learning Methods, Yinduo Ma

Theses and Dissertations (Comprehensive)

After the financial crisis in 2008, for many companies, their credit ratings were downgraded to the non-investment grade. People started concerning the reliability of credit ratings. Credit score rating plays a vital role in the financial system by balancing information between investors and creditors. It is considered as an essential factor to make financial investment decisions. This thesis is an attempt to determine how to predict the credit rating using the publicly available financial information about companies. The data collected are viewed as high-dimensional multivariate financial time series data, which have more than one time series and more than one …

Sharing New Knowledge: A Review Of Dissemination Rates And Journal Emphasis In Career And Technical Education, Victor M. Hernandez-Gantes

Journal of Research in Technical Careers

In career and technical education (CTE), the role of academic journals has been critical in the dissemination of information as the field shifted from vocational education to CTE. To keep up with changes in the field, some journals have been renamed to reflect the new emphasis, other journals have retained their historical branding, and new journals have emerged. Thus, the purpose of this descriptive research was to review the typology and dissemination rates of journals currently available in CTE as a means to clarify their role and impact in the field. The review resulted in the identification of 17 journals …

Defining Effective Teaching In Environmental Education: A Georgia 4-H Case Study, Lillian G. Meighan, Nicholas E. Fuhrman

Journal of Research in Technical Careers

Many studies have examined the positive learning outcomes of environmental education (EE), yet few have questioned the means for achieving such outcomes through non-formal teaching methods. Six interviews and four observations were conducted with 4-H environmental educators in Georgia. Study participants defined effective instruction in Georgia 4-H EE as novel and student-centered, where the educator utilizes their own distinct teaching styles, management of the learning environment, and extra resources while capitalizing on teachable moments. Educators worked to create both personal and environmental connections to inspire students to pursue science and environmental careers. EE trainings should prepare educators with either natural …

Real Time Spectroscopic Ellipsometry Analysis Of First Stage Cuin1-Xgaxse2 Growth: Indium-Gallium Selenide Co-Evaporation, Puja Pradhan, Puruswottam Aryal, Dinesh Attygalle, Abdel-Rahman Ibdah, Prakash Koirala, Jian Li, Khagendra P. Bhandari, Geethika K. Liyanage, Randy J. Ellingson, Michael J. Heben, Sylvain Marsillac, Robert W. Collins, Nikolas J. Podraza

Electrical & Computer Engineering Faculty Publications

Real time spectroscopic ellipsometry (RTSE) has been applied for in-situ monitoring of the first stage of copper indium-gallium diselenide (CIGS) thin film deposition by the three-stage co-evaporation process used for fabrication of high efficiency thin film photovoltaic (PV) devices. The first stage entails the growth of indium-gallium selenide (In_1-xGa_x)₂Se₃ (IGS) on a substrate of Mo-coated soda lime glass maintained at a temperature of 400 °C. This is a critical stage of CIGS deposition because a large fraction of the final film thickness is deposited, and as a result precise compositional control is desired in order to …

Biotime: A Database Of Biodiversity Time Series For The Anthropocene, Maria Dornelas, Laura H. Antão, Faye Moyes, Amanda E. Bates, Anne E. Magurran, Sarah R. Supp

Faculty Publications

No abstract provided.

Axiomatic Information Thermodynamics, Austin Hulse, Benjamin Schumacher, Mike Westmoreland

Faculty Publications

No abstract provided.

Front Matter

The Synapse: Intercollegiate science magazine

No abstract provided.

Think One Person Can Change The World? Plants Already Have, Anah Soble

The Synapse: Intercollegiate science magazine

No abstract provided.

And We Don't Have Liftoff: The Origin Of Flightless Birds, Rachael Branscomb

The Synapse: Intercollegiate science magazine

No abstract provided.

Nature Vs Nurture: The Impact Of Genes And Environment On Behavior, Ashley Xu

The Synapse: Intercollegiate science magazine

No abstract provided.

Brain Boost: The Dangers Of Stimulant Abuse In College Students, Rachel Reardon, Monzerat Vargas, Zoe Olivo, Matt Hedman, Cami Walter

The Synapse: Intercollegiate science magazine

No abstract provided.

Germ Theory: How We Became Acquainted With Diseases, Carson Mccann

The Synapse: Intercollegiate science magazine

No abstract provided.

If Cartilage Wears Away, Hydrogels Can Save The Day: A Look Into The Future Of 3d Printing In The Biomedical Industry, Courtney Broady

The Synapse: Intercollegiate science magazine

No abstract provided.

Marcelo Vinces, Victoria Albacete

The Synapse: Intercollegiate science magazine

No abstract provided.

Crossword Corner, Rachel Dan

The Synapse: Intercollegiate science magazine

No abstract provided.

Knockout Science, Loubna El Idrissi

The Synapse: Intercollegiate science magazine

No abstract provided.

Jack Of Some Trades: How Trade-Offs Allow Organisms To Succeed Where It Counts, Philip Hurst

The Synapse: Intercollegiate science magazine

No abstract provided.