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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 17 of 17 for “"Morlet"”.
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Time-frequency analysis of Lamb waves using the Morlet wavelet transform
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2000.
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Comparison of Paul and Morlet Wavelets for Measuring the Characteristic Scale of Peak Pressure Events on Low-Rise Structures
… This methodology is based on the use of the Morlet and Paul wavelets. Detailed descriptions of these wavelets and their implementation procedures are given. The results show that similar time scales or durations can be measured using either Morlet or Paul wavelets. To obtain consistent …
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Wavelet Analysis and its Application to Modulation Characterization
… time-varying characteristics are discussed. The Morlet wavelet is defined and procedures for choosing its parameters are described. The recovery of modulation characteristics using the Morlet wavelet is demonstrated. Hydrodynamic linear stability is reviewed and its application to steady and …
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Wavelet dönüşümüne dayalı dinamik güç spektrumu eldesi
… dayandırılmaktadır. Bu çalışmada, Foster'ın Morlet dalgacıklarına (wavelet) dayanan ağırlıklandırılmış dalgacık z-dönüşümü (WWZ) algoritması için yeni bir Python programı geliştirilmiştir. Programın sonuçları, bazı X-ışın çift yıldızlarının RXTE/ASM verileri üzerinde test edilmiştir ve …
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Task-Dependent Oscillatory Brain Activity During Oculomotor Delayed Response Task
… array. The data was analyzed by 6-cycle Morlet wavelet decompositions in the frequency range of 2-30 Hz to create time- frequency decompositions for four midline electrode sites. The 99% confidence intervals using the bootstrapped 20% trimmed mean of the 10 Hz frequency were used to …
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Analysis of Ionospheric Data Sets to Identify Periodic Signatures Matching Atmospheric Planetary Waves
… extract the periods of this collection of data a Morlet Wavelet analysis is used, along with thresholding to indicate events when similar periods are seen in each data-set. Trends are then determined, which can lead to verification of previous assumptions and new discoveries.
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Optimization of coded signals based on wavelet neural network
… consists three neurons. Each hidden layer uses Morlet function as activation function. WNN is a new class of network that combines the classic sigmoid neural network and wavelet analysis. We performed a simulation to evaluate the effectiveness of the proposed method. The simulation results …
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CLASSIFICATION OF HIGH IMPEDANCE FAULTS, INCIPIENT FAULTS AND CIRCUIT BREAKER RESTRIKES DURING CAPACITOR BANK DE-ENERGIZATION IN RADIAL DISTRIBUTION FEEDERS
… feeder events is proposed based on the complex Morlet wavelet (CMW) and on a decision tree (DT) classifier. First, the event is detected using CMW. Subsequently, a DT using event signatures classifies the event as normal operation, continuous and non-continuous arcing events (C.A.E. and …
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Three-dimensional pulsed disturbances in a plane mixing layer.
… is also studied. Wavelet transforms, both 1-D Morlet and 2-D Arc, are applied to study scales of the flow structures. The large-scale structure exhibits a staggered "chain-link"-like pattern in the streamwise and spanwise directions, whereas the small scale structures are initially generated …
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Relative sea level change in the Forth and Tay Estuaries: past changes informing future trends
… GIA corrections, Torrence and Compo’s (1998) Morlet wavelet transform and Graff’s (1981) sea level maxima analysis. The relative sea level data were then used to support adaptations of two sea level projection models to 2100; the UK Climate Projections 2009 (UKCP09) probabilistic model and …
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Smart grid analysis with particular references to power quality and load forecast
… (WT) is used for the new approach. Complex Morlet Wavelet (CMW) is selected for the new approach introduced in this thesis. The proposed algorithm is able to identify all harmonic components including integer, non-integer and sub-harmonics. Comparing with DFT, the proposed algorithm achieves …
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ANALYSIS AND MODELING OF NONSTATIONARY GROUND MOTION COHERENCY
… variation of seismic ground motion. Complex Morlet wavelet is chosen as the mother wavelet as it is quite well localized in both time and frequency space. Wavelet transform with significance tests have been used to distinguish the strong motions S-wave window with the corresponding frequency …
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Time-frequency investigation of heart rate variability and cardiovascular system modeling of normal and chronic obstructive pulmonary disease (COPD) subjects
… components. In the second part of the study, the Morlet, Meyer, Daubechies 4, Mexican Hat and Haar wavelets are used to investigate the heart rate and blood pressure variability from both COPD and normal subjects. The results of wavelet analysis give much more useful information than the Cohen's …
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Large Eddy Simulation and Wavelet Analysis of the Flow Field around a Surface Mounted Prism
… analysis are carried out using complex Morlet wavelet transform to investigate pressure-velocity relation. The study shows that the nonlinearity in the relationship of velocity-pressure is detected using wavelet bicoherence.
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Dynamic non-linear system modelling using wavelet-based soft computing techniques
… By extending the line of research, two Morlet Wavelet Neural Network (WNN) structures have been introduced. Increasing the accuracy and decreasing the computational cost are both the primary targets of proposed novelties. Modifying the synoptic weights by replacing them with Linear …
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Experimental Analysis of the Interaction of Water Waves With Flexible Structures
An experimental investigation of the interaction of water waves with flexible structures acting as breakwaters was carried out. Wave profiles, mapped out by water level measuring transducers, were studied to provide information on the performance of different breakwater models. A new signal …
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Δυναμική ανάλυση και ανάπτυξη μεθόδων διάγνωσης σφαλμάτων ελεγχόμενου κινητήριου συστήματος αποτελούμενου απο ασύγχρονη μηχανή δακτυλιοφόρου δρομέα και ηλεκτρονικούς μετατροπείς ισχύος
… σήματος του ρεύματος με το μιγαδικό κυματίδιο Morlet. Η μέθοδος αυτή εφαρμόστηκε για την περισσότερο αξιόπιστη ανίχνευση και την ακριβέστερη αποτίμηση σφαλμάτων στο δρομέα ασύγχρονων μηχανών, μέσω ανάλυσης του ρεύματος του στάτη. Στο κεφάλαιο 6 γίνεται μια προκαταρκτική διερεύνηση σχετικά με τη …