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.
Results
Showing 1 to 20 of 24 for “"long-term dynamics"”.
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Long-term dynamics and theoretical considerations in coral holobiont adaptation
… DNA in coral reef research, (2) determining what structures the holobiont in centuries-old massive corals, and (3) providing a novel theoretical framework for why holobiont shifts occur. From this research, it is clear that host genetics play a strong role in structuring the coral …
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Long-term dynamics of forest phenology across the central hardwoods
… From these estimates, I additionally measured long-term trends and used machine learning models to understand how these metrics were changing over time and what factors might be driving those responses. My analysis revealed spatially heterogeneous trends in phenology across the central …
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Stochastic Actor-Oriented Models of Functional and Structural Human Brain Networks in Aging
… networks in the brain. Beyond trends, the dynamics across long timescales are still poorly understood. Our research aims to address the question of these long-term dynamics by carefully adapting and applying the stochastic actor-oriented model to brain networks derived from MRI data in an …
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Generalizations of Threshold Graph Dynamical Systems
Dynamics of social processes in populations, such as the spread of emotions, influence, language, mass movements, and warfare (often referred to individually and collectively as contagions), are increasingly studied because of their social, political, and economic impacts. Discrete dynamical …
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A system impact analysis of government policies and regulations concerning demand response
… answer this question is the creation of a System Dynamics Model of the Electricity industry highlighting demand response, energy efficiency initiatives, electric vehicles, storage, and variable energy resources and associated regulatory levers. The model was used to analyze the impact of …
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Overstory structure and detrital dynamics of ponderosa pine forests: insights into fire behavior and its carbon consequences
… Colorado Front Range have raised questions about long-term changes in fire severity and the controls on fire behavior. It is widely believed that fire suppression has contributed to fuel accumulation and, consequently, has caused severe fires. My goal was to provide methodological insights into …
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The orbital dynamics and long-term stability of planetary systems
… the faintness of the host stars, cannot be determined using other techniques. This type of analysis is performed for KOI- 984, a system with a single transiting planet perturbed by a non-transiting companion. By modeling the gravitational interaction between the planets using our code TTVFast, …
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Integrated Model to Plan Advanced Public Transportation Systems
… transit variables. In this project the Systems Dynamics methodology is adopted to track the dynamic behavior of model variables and feedback loops forming among them. The proposed framework is illustrated in a case study involving automated vehicle location systems (AVL) applied to a small …
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Magnetohydrodynamics in the Inner Regions of Protoplanetary Discs
… depleted from the active region, altering its long-term dynamics. Second, two novel sources of short-timescale accretion variability, localised at the dead–active zone interface, are identified: a complex reconfiguration of the local structure, driven by the topological rearrangement of …
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Evaluating, Understanding, and Mitigating Unfairness in Recommender Systems
… (MF) models by explicitly adding them as penalty terms to learning objectives. Next, we target a form of unfairness in matrix factorization models observed as disparate model performance across user groups. We identify four types of biases in the training data that contribute to higher …
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Modelling and investigation of the role of anthropogenic noise on the collective behaviour of marine animals
… of anthropogenic noise they are subjected to, along with the industrialisation of vast areas in our seas and oceans, the impact this may have on their survival has become an important question for industry and scientists alike.<br/><br/>In this thesis, we propose an individual based model …
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Context and Place Effects in Environmental Public Opinion
… about the environment.</p><p>Research into the dynamics of public opinion has found a generic relationship between policy change and public demands for activist government. Yet, less is known about the relationship between policy and attitudes in individual issue areas. In the first chapter, I …
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Dynamics in Discrete Time: Successional Communities, Spatial Models, and Allee Effects
… face of these events, knowledge of population dynamics and how these dynamics may respond to changing environmental factors is of particular relevance. Mathematical models can help analyze such population behavior, and their predictions can aid decision-making regarding species conservation, …
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Remote Sensing & GIS for Land Cover/ Land Use Change Detection and Analysis in the Semi-Natural Ecosystems and Agriculture Landscapes of the Central Ethiopian Rift Valley
… about the effect of land use/land cover (LULC) dynamics, due to lack of technical know how and logistical problems. However, it has been shown in this study that sophisticated image management works are not always relevant. Instead a simple method of utilizing the thermal band has been …
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Modelling the age-dependent dynamics of clonal haematopoiesis
… While recent studies have begun to quantify CH dynamics -- for example, estimating expansion rates for common driver variants -- our understanding remains incomplete. This thesis addresses two key unanswered questions: how the selective landscape in blood changes across the human lifespan, and …
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Paleolimnological Reconstruction of Long-Term Trends in Phototrophic Communities in Prairie Reservoirs
… findings demonstrate a novel means to infer long-term dynamics of the cyanobacterial community in inland waters and highlights the power of paleo-16S-high-throughput sequencing to rapidly identify problematic organisms with high resolution. These techniques were also applied on Lake …
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Novel disturbance regimes in the Arctic: paleoecological perspectives on fire and thermo-erosion from Alaskan tundra
… pool available for microbial decomposition. On longer timescales, fires can enhance permafrost thaw by reducing surface albedo, enhancing surface roughness, and facilitating shrub expansion and snow drift, which can alter the soil thermal regime. Thus, these novel disturbance regimes may result …
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Mathematical modelling and investigation of oncolytic therapies for cancer: The role of macrophages in tumour-virus interactions
… be infected with VSV) [152]. We investigate the long-term behaviour of the model by focusing on steady states and limit cycles, and study changes in this long-term dynamics as we vary different model parameters. The proliferation and decay rates of macrophages play an important role on the …
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