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 43 for “"Spatio-temporal dynamics"”.
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Spatio-temporal dynamics before population collapse
… direct observation of critical slowing down in spatio-temporal dynamics before population collapse. In the first project, we mapped the bifurcation diagram experimentally and found that the populations became more vulnerable to disturbance closer to the tipping point. Fluctuations of population …
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Nonlinear and Chaotic Spatio-temporal Dynamics in Semiconductor Superlattices
Die Ladungsträgerdynamik in Halbleiterübergittern wird theoretisch auf der Grundlage eines semiklassischen sequentiellen Tunnelmodells untersucht. Abhängig von den Modellparametern ergeben sich dabei laufende oder stationäre Anreicherungs- und Verarmungsfronten der Elektronen. Besonders …
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Spatio-temporal dynamics of the disordered Bose-Hubbard model
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-19 without embargo terms
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Spatio-Temporal Dynamics of Reaction Zones in Catalytic Monolith Reactors
… their applications. In this work, we studied the spatio-temporal dynamics of monolith reactors in three important cases, in order to provide guidance for improving the design and control of after-treatment systems. In the first part, a physics-based one-dimensional transient model is proposed to …
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Spatio-Temporal Dynamics Of Phytoplankton Biomass From Ocean Color Remote Sensing And Cmip5 Model Suites
Phytoplankton are the base of the marine food web, and, importantly, drive the biological carbon pump, the combination of photosynthesis, organic carbon sinking and subsurface decomposition of organic matter which effectively sequesters carbon away from the atmosphere. Our knowledge of …
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SPATIO-TEMPORAL DYNAMICS OF BIOMES IN THE NORTHWESTERN UNITED STATES (9000 YBP TO THE PRESENT)
The goal of this study was to quantitatively analyze and map the vegetation composition of forest, grassland, and steppe ecosystems in the northwestern United States in the present and through the last 9,000 years. The modern analysis used canonical correspondence analysis (CCA) on pollen …
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SPATIO-TEMPORAL DYNAMICS OF BIOMES IN THE NORTHWESTERN UNITED STATES (9000 YBP TO THE PRESENT)
The goal of this study was to quantitatively analyze and map the vegetation composition of forest, grassland, and steppe ecosystems in the northwestern United States in the present and through the last 9,000 years. The modern analysis used canonical correspondence analysis (CCA) on pollen …
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Everyday Heritage, Spatio-temporal Dynamics and Place-making: Rethinking the Social Production of London’s Chinatown on the Backdrop of COVID-19
… heritage space’, 2) Chinatown as a series of ‘spatio-temporal events’, and 3) Chinatown as a ‘process of negotiation’. This thesis argues that the 1985 Chinatown designation can be seen as a top-down heritage/placemaking project, underpinning the ongoing construction of the dominant Chinatown …
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Spatio-temporal dynamics of spontaneous neural activity during the transition from slow oscillations to an awake-like state in isolated cortical networks
… signals to investigate the network activity dynamics during this liminal regime. Our method, built upon an original mathematical framework, pro- poses a new normalisation of the wavelet power components that allows quantifying the level of asynchronicity at every given instant. We then …
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On the Effect of Ignoring Within-Unit Infectious Disease Dynamics When Modelling Spatial Transmission
… data to assist in the understanding of the spatio-temporal dynamics of infectious diseases in discrete time (Deardon et al., 2010). ILMs are generally fitted to epidemic data through Markov chain Monte Carlo (MCMC) methods in a Bayesian statistical framework. Here, we test the effect of …
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Spatio-Temporal Connectivity in Dynamic Tropical Fragmented Landscapes
… development of new metrics to quantify landscape dynamics; (ii) the assessment of the effects of land-use intensification on spatio-temporal dynamics and connectivity; and (iii) the quantification of potential drivers of these changes in the spatial dynamics. In the first part of my thesis, I …
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Study of the role of differential diffusion and equation of state on the features of stably stratified turbulent channel flow using direct numerical simulations
… the density stratification is known to alter the dynamics of turbulence. In this study, results from direct numerical simulations of stably stratified turbulent channel flow under moderate levels of differential diffusion and two types of EoS are examined in terms of instantaneous, statistical, …
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Insects in urban brownfields: analyses of species occurrences, community composition, and trait frequencies along a successional gradient
… of species. Brownfield habitats show high spatio-temporal dynamics, forcing species constantly track suitable habitat. The thesis provides insight into the mechanisms of leafhopper and grasshopper species survival in brownfield habitats. Within a habitat modelling framework, species …
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Mathematical Modelling of the Immune Response to Cancer
… plat- form, CompuCell3D, to extend an earlier spatio-temporal model of tumour dormancy (Matzavinos et al. [2004]). Chapter three investigates and analyses an ODE model of the interaction of two immune cells and two tumour cells. This model is extended to include spatial movement terms for the …
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Imaging räumlicher und zeitlicher Dynamik der Geruchstoffrepräsentation im Bulbus Olfactorius der Säugetiere mit einem neuen spannungsabhängigen Farbstoff
… described in the mammalian olfactory bulb. Their temporal dynamics have so far only been ex-amined in non-mammalian vertebrates and insects. Complex temporal response patterns have been described on a single cell level or with low spatial resolution using electroencephalography (EEG), however …
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Untangling the complexity of nature: Machine-learning for accelerated life-sciences
… the resolution and breadth required to probe the spatio-temporal dynamics of language context dependence and representation in the brain. Second, we argue for the importance of ML interpretability to accelerate the understanding of biology. We develop an explainable general-purpose tool for …
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Ultrafast spatiotemporal dynamics of photoexcitations in two-dimensional semiconductors
… IV monochalcogenides. First, we explore the spatio-temporal dynamics of photo-excited species in monolayer transition metal dichalcogenides. Using pump-probe spectroscopy, and a range of steady state characterization techniques (ellipsometry, reflectance, photoluminescence), we study the …
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Contributions to the Analysis of Biochemical Reaction-Diffusion Networks Stability, Analysis, and Numerical Solutions
… of the differential equations that govern their spatio-temporal dynamics, at the cost of studying simplified scenarios of the biological systems under study. Although these simplified scenarios do not model all aspects of the complex interplay in the biological system, they are derived to study …
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Recent changes in land use and productivity in agro-pastoral Inner Mongolia, China
… of the rapid agricultural development. The spatio-temporal dynamics of primary production for the IMAR was analysed by means of a regionally adapted light use efficiency model. The model, driven by a combination of NOAA AVHRR data and climatic data, has been used to map monthly Gross Primary …
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