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 23 for “"critical thresholds"”.
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Critical thresholds in Eulerian dynamics
In this thesis, we study the critical regularity phenomena in Eulerian dynamics, $u_t+u\cdot \nabla u=F(u,D u,\cdots), $ here $F$ represents a general force acting on the flow and by regularity we seek to obtain a large set of sub-critical initial data. We analyze three prototype models, ranging …
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Sacrosanct Values, Controversial Artistic Expression, and Today's Global Society: A Dramatistic Analysis of the Muhammad Cartoon Controversy
… Muhammad Cartoon Controversy unfolded at three critical thresholds of the conflict's development vis-à-vis a comprehensive examination of the scope of the phenomenon. First, this study focuses a lens on critical communications that transpired in Denmark among key figures engaged in the conflict. …
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Continuous Multi-Modal Monitoring of Cerebrovascular Reactivity in Adult Traumatic Brain Injury
… PRx using non-invasive means? [E] What are the critical thresholds associated with outcome for ICP derived indices? [F] Are any specific ICP derived index/indices superior for outcome prediction? and [G] What role do intra-cranial (IC) and extra-cranial (EC) injury burden play in driving …
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Numerical Modelling of Braiding Processes in Gravel-Bed Rivers
… colonisation. Such interactions are governed by critical thresholds, due to changes in flow resistance and bank strength associated with the distribution, form and intensity of vegetation colonisation. Subtle changes in flow or sediment supply that promote vegetation growth or indeed remove …
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Public Opinion concerning the Feasibility of South Africa meeting its greenhouse gas emission targets
… global temperatures are expected to surpass critical thresholds required for effective climate change management. Thus, achieving lower temperatures would require more ambitious mitigation efforts. The methodology utilized in this dissertation employs a non- random survey of expert opinions …
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Perfect Recovery in Heterogeneous Stochastic Bicluster Models
… reveal sharp phase transitions, identifying critical thresholds for perfect recovery of the planted structure. In the noiseless regime, i.e., when all inter-cluster edges carry negligible or zero weight, the semidefinite relaxation is exact whenever the graph contains k large, dense, disjoint …
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The Impacts of Biofuel Expansion on the Resilience of Social-Ecological Systems in Ethiopia
… have not surpassed the majority of potential critical thresholds that would induce regime shifts. Therefore, most of the sub-systems under study, and actors within them, are resilient to the perturbation of biofuel expansion to date. However, a detrimental regime shift is underway for …
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Survival strategies of eelgrass in reduced light
… while managers have sought tools to identify critical thresholds for light availability and predict impacts of human-induced disturbances in order to prevent further eelgrass loss. In the present thesis, a review of some of the literature on light reduction and its effects on eelgrass (i) …
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Nonlinear Dynamics In Musical Interactions
… explorable interactions, particularly close to critical thresholds. A distinction is raised between instantaneous unpredictabilities that emerge from the interaction with the tool (interactional ), and unpredictabilities that result from the unexpected implications of the conjunction of …
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Control by Vegetation Disturbance on Gully Rejuvenation Following Wildfire
… loss of vegetation due to wildfire leads to critical thresholds of hydrologic connectivity after which runoff and erosion accelerate. The source area analysis suggests that forces of convergent flow are not fully expressed until a significant proportion of vegetation has been consumed such …
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Control by Vegetation Disturbance on Gully Rejuvenation Following Wildfire
… loss of vegetation due to wildfire leads to critical thresholds of hydrologic connectivity after which runoff and erosion accelerate. The source area analysis suggests that forces of convergent flow are not fully expressed until a significant proportion of vegetation has been consumed such …
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The Association Between Non-Esterified Fatty Acids And Beta-Hydroxybutyrate During The Transition Period In Holstein Dairy Cows And Negative Downstream Outcomes - Disease Incidence, Milk Production And Reproduction
… The objectives of herein were to: 1) identify critical concentrations of NEFA and BHBA above which the development of diseases were more likely; 2) describe statistical methods for best evaluating these effects as risk ratios; 3) identify the NEFA and BHBA critical concentrations associated …
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Climate impact on phytoplankton blooms in shallow lakes
… and duration of heat waves determined whether critical thresholds of thermal stratification, decisive for cyanobacterial bloom formation, were crossed. In addition, the temporal patterns of heat wave events influenced the summer abundance of some zooplankton species, which as predators may …
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Influence of network structure on disease spread and persistence
… cycles, the impact of network structure on critical thresholds and disease persistence, and how network structure influences surveillance and interventions. Under the first theme, for ASF in wild pigs, I showed that the timing of birth and death processes affects disease persistence and that …
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Aeolian dust emission dynamics across spatial scales: landforms, controls and characteristics
… Accounting for localscale surface variability is critical to our understanding of dust emitting processes. This study identifies mineral dust using remote sensing, establishes emission thresholds through field measurements and identifies particle chemistry for major dust sources in the Central …
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Apoptosis in Haematopoietic progenitors
… paired observations, 3) explored various critical thresholds for ICP and PbtO2, and 4) interrogated digital data trends depicting the relationship between ICP and PbtO2. The level of agreement between hourly recorded and high frequency electronic data for ICP and PbtO2 was also evaluated. …
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Paediatric traumatic Brain Injury: The relationship between Intracranial Pressure and Brain Oxygenation
… paired observations, 3) explored various critical thresholds for ICP and PbtO2, and 4) interrogated digital data trends depicting the relationship between ICP and PbtO2. The level of agreement between hourly recorded and high frequency electronic data for ICP and PbtO2 was also evaluated. …
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Proteomic comparison of Amoxicillin resistant and susceptible periodontal Provotella Intermedia and Provotella Nigrescens clinical isolation with Matrix-Assisted Laser Disportion Ionization Time-Of-/flight mass spectrometry
… is capable of growing in the presence of critical thresholds of test antibiotics, such as β-lactam antibiotics. Because such conventional in vitro antibiotic testing is time-consuming, expensive, and labor-intensive, there is an urgent clinical need for more rapid assays to determine the …
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Toward Ecological Holism: Discerning Pattern, Process and Scale Across the Productivity Landscape
… instability, ecosystems are being pushed past critical thresholds resulting in loss of biodiversity and declines in productivity. The internal processes of natural ecosystems are self-correcting, conditioned on the adaptive traits of organisms as they respond to local environmental conditions …
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Causal factors and consequences of mixed-severity fire in Black Hills ponderosa pine forests
… density < 40 % and slope < 18 % represent critical thresholds where low and moderate severity were more likely to occur. High stand density presented the most likely scenario for crown or high severity fire. Our conclusion that structure does influence burn severity has important …
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