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 74 for “"Autocorrelation function"”.
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A STUDY OF UNIT ROOT TESTING
… to the usual graphical aids such as time plot, autocorrelation function, partial autocorrelation function and inverse autocorrelation function, we propose the use of a new graphical procedure, due to Cressie (1988), to determine the order of differencing. The testing strategies are the Dickey, …
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Measurement of the dependence of the averaged internal mode on the scattering vector and of the first internal mode on the concentration of polystyrene in solution using photon correlation spectroscopy
… concentration fluctuations in the polymer and autocorrelation function was calculated; The autocorrelation function can be written as a sum of decaying exponentials. The center-of-mass mode with a decay constant Dq{dollar}\sp2{dollar} is contained in every mode. D is the polymer diffusion …
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Analytical determination of autocorrelation and noise power density spectrum of randomly modulated pulse width square waves
… ·criterion is well furnished by knowing the autocorrelation function of the input to the linear system. This input signal is generally an additive mixture of a piecewise continuous message and a noise. The problem considered in this paper is the determination of the autocorrelation function …
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Portmanteau Tests For Univariate And Multivariate Time Series Models
… bases on exponential weights of the residual autocorrelation function and the residual partial autocorrelation function. The asymptotic distributions of the new univariate portmanteau tests were derived. Monte Carlo experiments were used to compare the performance of the two new tests to …
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Aspects of burst errors in digital telecommunications transmission systems.
… research project investigates the use of the autocorrelation function of the error activity. Sources of error activity in digital transmission systems are studied and their effect on system performance identified. A new mechanism is presented which is demonstrated to detect changes in the …
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An investigation into the use of multiple cryptocurrencies in a diversified portfolio
… ii) Kendall Tau-b correlations; and, iii) autocorrelation function for serial correlations. The JSE All Bond Index is used as bond investment proxy, a combination of the JSE Top 40, Resources Index and Financial-Industrials Index is used as an equity investment proxy, and the LBMA Gold PM …
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Seasonality in commercial real estate transaction volume and capital returns
… on all properties, based on the results from an autocorrelation function.
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Nanoscale Thermal Fluctuation Spectroscopy
… semiconductors is developed in this paper. The autocorrelation function is obtained from power spectral density measurements thus enabling electronic transport property calculation through the Green-Kubo formalism. This experimental approach is distinct from traditional numerical methods such as …
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Iterative Memoryless Non-linear Estimators of Correlation for Complex-Valued Gaussian Processes that Exhibit Robustness to Impulsive Noise
The autocorrelation function is a commonly used tool in statistical time series analysis. Under the assumption of Gaussianity, the sample autocorrelation function is the standard method used to estimate this function given a finite number of observations. Non-Gaussian, impulsive observation noise …
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Multitaper Methods for Cyclostationary Feature Detection in Time Series Data: Application to ACE Interplanetary Magnetic Field Data
… set of low-frequency periodic components of its autocorrelation function.
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Eigenfunctions in chaotic quantum systems
The structure of wavefunctions of quantum systems strongly depends on the underlying classical dynamics. In this text a selection of articles on eigenfunctions in systems with fully chaotic dynamics and systems with a mixed phase space is summarized. Of particular interest are statistical …
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Study of prothrombin activation by taipan snake venom using light beating spectroscopy
… filtering techniques, were measured as a function of scattering angle to determine the particle size uniformity. P vs K plot was found to be linear for one sample at 1°C, but nonlinearity was seen for other two samples of human prothrombin at 2°C, indicating some aggregation. The …
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Complete Temporal Characterization of Single Photons
… temporal density matrix by measuring the autocorrelation function of the photocurrent from a balanced homodyne detector at multiple local oscillator frequencies. We lay the theoretical foundation for our work and describe the experimental methods involved in detail. We show the results of …
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Nonequilibrium Relaxation and Aging Scaling Properties of the Coulomb Glass and Bose Glass
… the density of states and the two-time density autocorrelation function for the two- and three-dimensional Coulomb glass as well as the Bose glass phase of flux lines in type-II superconductors. We find a very fast forming gap in the density of states and explore the dependence of temperature …
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Prostate cancer recognition in ultrasound images
… of the signal, the continuity of the signal, the autocorrelation function and frequency domain properties of prostatic ultrasound images are different in normal tissue than in cancerous tissue; This thesis presents an algorithm for automated cancer recognition in prostatic ultrasound imagery. …
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Stratospheric scattering of radio waves and the Jicamarca radio telescope
… fluctuations are directly related to the autocorrelation function of the scattered signals. The theory and mechanisms of stratospheric scattering of radio waves is discussed. The equipment and procedures used in previous experiments at the Jicamarca Radio Observatory are examined in …
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A method for replicating ice accretion roughness using multi-scale analog distributions.
… with the next downstream roughness elements. An autocorrelation function was employed on a real ice surface to capture the root-mean-square-roughness height, the primary streamwise wavelength, and the aspect ratio of surface microscales. Two distributions of deterministic roughness, one of …
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A three-dimensional analytical study of spatial variability of seismic ground motions
… over a fault plane is then represented by an autocorrelation function of the dislocation velocity, from which the source motion is modeled as a random process specified by a power spectral density function. To separate the path effect from the source effect, a multi-degree-of-freedom system is …
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Coherent control of neutron interferometry
… a new method that is capable of measuring the autocorrelation function of a sample is proposed. This new technique can extend the capability of traditional neutron scattering experiments. All experiments are conducted at the neutron interferometry facility at the National Institute of Standards …
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Multicodes for improved range resolution in radar
… environments [8, 9, 10]. This multi-rate multi-function capability may be used in Radar related applications, too. For example, a single transmitted waveform consisting of two orthogonal codes can be used to simultaneously track a target and obtain high range resolution. Tracking requires low …
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