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 30 for “"Regime shift"”.
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Investigating volatile organic compound composition in Houston, Texas amidst an atmospheric regime shift.
… in emission inventories highlight a substantial shift from historical VOC source profiles and represents a new challenge in identifying the VOC emission sources leading to sustained air pollution. Houston, Texas, a hub for national petrochemical processing, offers a unique region to study VCPs. …
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Investigating volatile organic compound composition in Houston, Texas amidst an atmospheric regime shift.
… in emission inventories highlight a substantial shift from historical VOC source profiles and represents a new challenge in identifying the VOC emission sources leading to sustained air pollution. Houston, Texas, a hub for national petrochemical processing, offers a unique region to study VCPs. …
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Environmental changes and regime shift analysis in the southern Benguela using output from earth system models
… using the sequential t-test algorithm for regime shift detection (STARS), in an attempt to detect any abrupt, long-term shifts. Projections under SSP1-2.6 tended to follow their historical trajectories, and displayed gradual changes over time. Under SSP5-8.5, however, future projections …
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Regime change and weak form efficiency of South African foreign exchange markets
… 2005 were used. February 2000 was the date for a regime-shift and the sample is divided into two sample periods. By using the likelihood ratio test proposed in Dickey Fuller, I find that the regime-shift does help the foreign exchange market in South Africa to be efficient in that past exchange …
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The Impacts of Biofuel Expansion on the Resilience of Social-Ecological Systems in Ethiopia
… systems, identifying potential trade-offs and regime shifts. Additionally, this research highlights the differentiated impacts for actors across multiple scales, allowing power relations to be taken into account – the lack of which is a common criticism of resilience studies. The thesis …
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Testing alternative stable state theory at Afromontane and Milkwood forest-fynbos ecotones
… Anthropogenic modifications to disturbance regimes alter the stability of forests and fynbos and may shift forest and fynbos into a degraded species-poor state. Conservation practitioners are concerned over perceived loss of forest habitat, and tree planting initiatives are common in parts …
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Extreme weather events in the upper Midwest: Implications on flood risk, crop yield, and water quality
… variations. Probabilistic assessments and regime shift analyses highlight the non-stationary nature of these events, emphasizing the need to update traditional risk estimation methods. The research also identifies an increasing trend in compound extreme events, particularly precipitation …
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Analysing modelled nearshore wave climate variability and change as relevant to the traditional handline fishery of the South African South Coast
… and a declining number of sea days caused by shifts in wind patterns are affecting their livelihood, applicable scientific research and data on scales relevant to the fishers is insufficient. Insight into the complexities involved in climate change and local-scale responses of these highly …
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Carbon gains, losses, and feedbacks in shallow, eutrophic lakes of phytoplankton and macrophyte dominance
… coupling due to their high perimeter:area ratio. Shifts between macrophyte and phytoplankton dominance are widespread and common in shallow lakes, with potentially large consequences to regional carbon cycling. I thus compared a lake with clear-water conditions and a submerged macrophyte community …
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Tipping points, regime shifts and species interactions within shallow marine ecosystems
… or over exploitation, entire ecosystems can shift to alternative states, a phenomenon termed regime shifts, and in extreme cases can collapse. Ecological regime shifts, or shifts between different ecological states, can be triggered by pulse disturbances (short term effects) or press …
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Effects of repeated fire on the savanna / forest boundary
… an extreme fire event, could trigger a biome or regime shift; in this case from forest/thicket to savanna. Fire spread is determined by grassy fuel loads, primarily grass biomass in these ecosystems, and the fire weather at the time of the fire. Grass biomass was found to have significantly …
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The evolution of tidal coastal landscapes and the controls on pathways to equilibrium
… parameters such as intertidal area, inundation regime, connectivity and accommodation space. This thesis uses multiple methods including idealized modelling, field observation of an estuarine shoal covered with mangroves, and a calibrated and validated model with field data in order to explore …
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Essays on continuous time diffusion models.
… time diffusion models. First, we propose regime-switching Heston, GARCH, and CEV stochastic volatility models where all parameters are allowed to vary depending on the state of the economy. Then we apply these models to describe the dynamics of S&P 500 and VIX. We find strong evidence of …
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Deciphering the Tectonics of the Caucasus from Post-Collisional Volcanism
… Strike-slip faulting, the result of a tectonic regime shift at 5 Ma, determined the location of volcanoes. Although the style of post-collisional magmatism may not be characteristic of all continental collision zones, where present it has a high preservation potential. It may therefore play a …
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Assessing the dynamics of soil erosion and sediment transport under increasing land use pressures in East African Rift Catchments
… convergence of surface flows eventually led to a regime shift into a highly incised landscape, where high amounts of eroded soils from all over the catchment are rapidly transported downstream by strongly connected ephemeral drainage networks. Increasing land use pressures are the major driver for …
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Historical regimes of socio-natures in farmlands: practices of conventional farming in Fukuoka, Japan
… policy, farming technologies), in other words “regimes,” around socio-natures of rice paddies have shifted over time from the “nature-subduing agriculture” regime (the 1940s—1980s) to the “environmental conservation agriculture” regime (the 1980s—2010s). To explain the regimes and the shift over …
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Trophic models of the Benguela upwelling system : towards an ecosystem approach to fisheries management
… their relative abundance, with some signs of a "regime shift' from anchovy to sardine dominance. Steady-state models show that there are structural and functional differences between the northern and southern Benguela sub-systems. Dynamic simulations of altered fishing strategies show that in the …
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Analysis of non-synchronous trading effects on the pricing of Exchange Traded Products: an empirical analysis of the effects on ETP price volatility that result when the ETP instrument is listed on an exchange that is in a different time zone to that of the underlying securities basket
… the partially synchronous group, evidence of a regime-shift is observed during the period when the market of the underlying securities transitions from open to closed during the NYSE trading session. Another factor observed in the relative volatility profile is the impact of foreign exchange …
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