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 32 for “"fluctuation analysis"”.
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Quantification of long-range power law correlations among healthy and pathologic subjects using detrended fluctuation analysis and multifractal detrended fluctuation analysis
… that under normal conditions, beat-to-beat fluctuation in heart rate display the kind of long-range correlations typically exhibited by the dynamical system far away from equilibrium. In contrast, heart rate time series from patients with severe congestive heart failure show a breakdown of …
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Sodium channel regulatory mechanisms : current fluctuation analysis on frog skin epithelium
… channels. To test this hypothesis, we used noise analysis to examine the effects of disrupting the cytoskeleton, on two different mechanisms which bring about changes in open channel densities. The mechanisms are: (1) lowering mucosal Na⁺ concentration (non-hormonal), and (2) addition of …
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Study of the C-curve fluctuation analysis for a CSTR reactor
… of this study was to determine whether the fluctuations of concentration in the exit stream for a RTD were statistically random. A 460ml one inlet, one outlet CSTR (Continuous Stirred Tank Reactor) was set up to perform the RTD (Residence Time Distribution) test. A electrical conductivity …
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Determining the moderator temperature coefficient in a PWR by stochastic fluctuation analysis
… to an analytical model. The method correlates fluctuations in the neutron flux with fluctuations in the coolant temperature. Results show that the frequency response function between the in-core neutron flux and thermocouple signals is proportional to the MTC and can be used to monitor changes …
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Characterization of hypertension through multivariate analysis utilizing linear and nonlinear methods
Analysis of blood pressure by nonlinear methods is vastly underutilized in current research. As such, 24-hour ambulatory blood pressure data from a small cohort of borderline hypertensive and normotensive subjects were analyzed using linear and nonlinear methods. Data were collected and provided by …
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A Measure of the Hurst Exponent Variability on Ground Based Magnetometer Data for Quiet and Active Magnetospheric Periods
… not less than 24 consecutive hours. Detrended fluctuation analysis was employed to analyze 40 events. A monofractal approach was used to identify differences in the Hurst exponent of quiet and active events. No statistical differences were found using this approach since both types of events …
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Adaptability of Human Gait: Exploring Red Noise Auditory Stimuli and Gait Fluctuation Patterns
… for entraining gait. The study used Detrended Fluctuation Analysis to analyze gait variability, characterized by a Fractal Scaling Index (FSI), compared to auditory stimuli with FSI values between 1.00 to 1.25. Stepping strategy was analyzed through kinematics including cadence, stride time, …
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Anomalous statistical properties and fluctuations on multiple timescales
How can fluctuations in one-dimensional time series data be characterized and how can detected effects be decomposed into their dynamical origins or causes? In the context of these questions, a variety of problems are discussed and solutions are introduced. The first issue concerns the causes of …
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Building a rational model for the identification of allosteric sites
… developed a new technique using a combination of fluctuation analysis, cross correlation, simple intrasequence difference (SID) and energy analysis.3 A potential site has been determined for the protein kinase DYRK2 using this technique. The potential allosteric pocket was studied through a …
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Detecting Transient Changes in Gait Using Fractal Scaling of Gait Variability in Conjunction with Gaussian Continuous Wavelet Transform
… effective in the clinical setting. Time-series analysis is used to analyze spatiotemporal variables in various populations. More recently, investigators have focused on gait complexity and the structure of spatiotemporal variations during walking and running. This study evaluated the use of …
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GNSS pre-correlation waveform feature extraction methods for multipath-afflicted signal classification
… methods of Generalized Hurst Exponent, Detrended Fluctuation Analysis, Correlation Dimension, Fuzzy Entropy and Recurrence Period Density Entropy were proposed and tested in numerical simulations implemented in MATLAB. For testing and simulation purposes, the GPS L1 C/A signal structure was …
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Correlation analysis between the EEG parameters and the parameters derived from ECG and Steering wheel related signals for driver drowsiness detection
… parameters were chosen for the correlation analysis, the EEG parameters are the alpha, beta and theta band power, the ECG parameters are heart rate, Heart Rate Variability (HRV) parameters and a parameter derived from Detrended Fluctuation Analysis (DFA), and the steering wheel related …
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On the transmission properties of synapses made between granule cells and cerebellar Purkinje cells
… with PCs as well as the PF segment. PPF and fluctuation analysis of EPSCs in rat PCs confirmed that the release sites of AA synapses have a greater probability of transmitter release than PF synapses. Furthermore, AA release sites have greater mean quantal amplitude than PF synapses, which is …
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Tracing clonal cell plasticity in the microenvironment of pancreatic ductal adenocarcinoma
… which enables cell sorting, quantitative image analysis, and effective decoding by statistical analysis. Using subcutaneous mouse models of pancreatic cancer, this thesis demonstrates that isogenic epitope labelling can detect epithelial clonal expansion events co-localised with fibroblasts in …
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Two-Color interferometry as a fluctuation diagnostic on Alcator C-Mod
… to measure line-integrated electron density fluctuations for turbulence and transport studies. Heterodyne signals from ten vertical-viewing CO2 laser chords are demodulated relative to a local oscillator using high bandwidth analog in-phase/quadrature electronics, replacing lower bandwidth …
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Submicron Correlations Of Receptor-positions On Cell Surfaces
… labeled. This technique is based on fluctuation analysis through direct calculation of correlation functions. It uses a confocal microscope configuration to obtain fluorescence records as a function of laser beam position on the surface of cells. The fluorescence records present …
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Probing Galaxy Evolution with AKARI
This thesis presents the first detailed analysis of three extragalactic fields observed by the infrared satellite, AKARI. AKARI is the only telescope able to observe deeply in the Spitzer/IRAC - Spitzer/MIPS band gap of 8-24 microns. The first analysis of these extragalactic fields, was to perform …
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Aging, Gait Variability, and Adaptability
… nonlinear measures (sample entropy and detrended fluctuation analysis). Movement trajectory variability of the dominant knee angle, and vertical and medial-lateral positions of the pelvis were quantified using nonlinear measures (correlation dimension and local dynamic stability). The results …
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Analysis and Modelling of Financial Logarithmic Return Data using Multifractal and Agent-Based Techniques
… data. I then use Multifractal Detrended Fluctuation Analysis to study the empirical log returns for multifractal scaling. I find that extreme events are inimical to the scaling in highly leptokurtic data. I also find that the temporal correlations in the data are crucial to the scaling …
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