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 36 for “"temporal coherence"”.
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Accelerated Ray Traced Animations Exploiting Temporal Coherence
… Both of these techniques exploit spatial coherence. These acceleration techniques are expanded not only to exploit spatial coherence but also to exploit temporal coherence in order to reduce calculations by treating animation information as a whole as opposed to isolating calculations to …
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Improved temporal coherence and short pulse generation in free electron lasers
… (SASE) Free-Electron Laser (FEL) has poor temporal coherence because the SASE process is a localised collective interaction that occurs on a scale far smaller than the typical length of the electron bunch used within the FEL. In this thesis a new technique, called High-Brightness SASE [1], …
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Mean, variance, and temporal coherence of the 3D acoustic field forward propagated through random inhomogeneities in continental-shelf and deep ocean waveguides
… are derived for the mean, variance and temporal covariance of the acoustic field forward propagated through an ocean waveguide containing internal waves, fish shoals, wind-generated bubble clouds and krill. These expressions account for the accumulated effects of multiple forward …
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Novel techniques in free electron lasers
… Emission regime, however this radiation has poor temporal coherence. The Echo-Enabled Harmonic Generation method can improve the radiation's temporal coherence in x-ray. In this thesis analysis of the Echo-Enabled Harmonic Generation technique reveals that electron pulse has a modal density …
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Doing time : inducing temporal graphs
… a directed acyclic graph that encodes temporal relations found in a text. The unit of our analysis is a temporal segment, a fragment of text that maintains temporal coherence. The strength of our approach lies in its ability to simultaneously optimize pairwise ordering preferences and …
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Advancements in Satellite SAR Methods for Monitoring Civil Infrastructure
… approaches for bridge monitoring: spatio-temporal InSAR (ST-InSAR) for measuring long-term displacement and micro-Doppler SAR (MDSAR) for measuring structural vibrations. The first part of the thesis discusses the issues of conventional InSAR for bridge applications, including phase …
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A Unified Framework for High-Frame-Rate High-Dynamic-Range Video Synthesis
… of conventional image sensors in capturing both temporal and radiometric fidelity. This work introduces a unified framework that jointly addresses HDR reconstruction and temporal interpolation from sequences captured with alternating exposures. In contrast to prior methods that focus only on …
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Description of Coherent Structures in the Atmospheric Boundary Layer By Model Reduction of the Surface Pressure
… increase the lifetime of turbine components. The coherence of these features suggests description by model reduction. To this end, an array of pressure transducers was deployed on the ground at Reese Technology Center in Lubbock, Texas, and the pressure fluctuations were recorded over nearly two …
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Language Development and Verbal Encoding: Implications for Individual Differences in Short-Term Memory in 3-Year-Olds
… perform less well was partially supported by EEG coherence analyses. Children in the high memory group had significantly greater frontal-temporal coherence in the left hemisphere (F7-T3) than the low memory group. However, this was true both at baseline and during encoding, implying that children …
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Creation and Experimental Validation of a Numerical Model of a Michelson Interferometer
… to investigate and understand the impact of coherence and polarization on the performance of instruments intended to monitor the Earth's radiant energy budget. The visibility of fringes produced by a Michelson interferometer is known to be sensitive to the degree to which the incident light …
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Optische Kontrolle der Lasertätigkeit im Röntgenbereich
… exceeding 10^18 W/cm^2. However, they lack temporal coherence and controllability of their pulses' temporal and spatial properties, which is essential for many applications. We investigate the possibility to control and shape x-ray laser pulses with optical light. An optical laser pulse is …
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On The Use Of Variable Coherence In Inverse Scattering Problems
… sensing procedures, controlling the degree of coherence of light did not find wide applications until recently. Since the emergence of optical coherence tomography, a growing number of scattering techniques have relied on temporal coherence gating which provides efficient target selectivity in …
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The Role of Spatial Structure in Human Duration Processing
… attributed to artefacts of stimulus visibility, temporal coherence or stimulus size. Adaptation experiments generated aftereffects of perceived duration within stimuli whose durations were defined solely by retinal disparity, providing the first demonstration of duration selectivity within …
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Acoustic mode coherence in the Arctic Ocean
… decomposition for tonal sound fields and the temporal coherence of the modal amplitudes are investigated for the case of the central Arctic sound channel at very low frequencies (15-80 Hz). A detailed study of the Arctic modal structure for these frequencies reveals the central role played by …
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Heterogeneous Feature Fusion for Visual Recognition
… action detection in videos, where the spatial-temporal coherence is combined with multiple visual features for detection tasks. We believe heterogeneous feature fusion is useful in a wide range of applications and merits research efforts in this promising direction.
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Bridging Multimodal Learning and Planning for Intelligent Task Assistance
… planning accuracy, cross-modal alignment and temporal coherence. These contributions are integrated into a context-aware multimodal task assistant, empirically validated through real-world user studies. Our work establishes a foundation for more robust, adaptable, and user-centric …
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Cognitive Map Generation for Vision and Language Navigation
… via SBERT. This two-stage process ensures temporal coherence and semantic grounding between text-based instructions and real-world visual environments.</p> <p>Experiments conducted on the Touchdown and Map2Seq datasets demonstrate improved navigation accuracy, robust scene-language …
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Individual differences in audiovisual integration and timing
… view is that the brain strives for and achieves temporal unity across different sensory modalities. Using individual differences in subjective synchrony and audiovisual temporal processing, this thesis examines whether audiovisual synchronisation across different audiovisual processes is ever …
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Development of a Fourier Domain Low Coherence Interferometry Optical System for Applications in Early Cancer Detection
… of one such technique called Fourier domain low coherence interferometry (fLCI). </p><p>The presented work first describes a detailed analysis of temporal and spatial coherence. The study shows that temporal coherence information in time frequency distributions contains valuable structural …
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Spatio-Temporal Dependence of Precipitation over the Contiguous United States
… Differences between the order of spatial and temporal averaging methods are proven to be significant; therefore quantifying these differences is critical for both climate model diagnostics and downscaling applications.The second section documents spatio-temporal statistics of hourly fine-scale …
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