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.
Results
Showing 1 to 20 of 65 for “"Frequency spectra"”.
-
Prevalence and frequency spectra of single nucleotide polymorphisms at exon-intron junctions of human genes
In humans and other higher eukaryotes the observation of multiple splice isoforms for a given gene is common. However it is not clear whether all of these alternatively spliced isoforms are a product of true alternative splicing or some are due to DNA sequence variations in human populations. …
-
An investigation into the utility of second differentiation of sound frequency spectra for speech analysis
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1954.
-
Non-Invasive Flow Measurement Via Distributed Acoustic Sensing Utilizing Frequency Spectra Analysis of Wall Pressure Fluctuations
… type of fiber optic sensor. Numerically smoothed frequency domain acoustic peaks are evaluated by intensity, area, central frequency, and full width at half maximum as flow conditions vary. All tested sensors were found to yield a strong dependence between peak intensity and flow rate. A …
-
Space and time scales of low frequency variability in the ocean
… Φ(K, ω, η, φ, λ) for the distribution of low frequency variability energy in horizontal wavenumber, frequency, vertical mode and geography. We assume horizontal isotropy, Φ(K, ω, η, φ, λ) = 2πKψ(k, l, ω, η, φ, λ), with K designating the amplitude of total horizontal wavenumber. The parameters …
-
Analysis of Two-point Turbulence Measurements for Aeroacoustics
… functions and 'pointwise' wave number frequency spectra. Two upwash spectra, calculated for locations in the region of the wake that is roughly homogenous in the spanwise direction, are direct estimates of the full wave number frequency spectra at their locations. As such, they are used …
-
Statistical response predictions in complex systems with dissipation
… on the intermodal correlations of natural frequency spectra are explored. It is found that for moderate damping the modal decay rates of complex systems are distributed according to a modified chi square distribution whose degree depends on the spatial distribution of lossy material in the …
-
Relaxations in molecularly thin simple liquid films:linear viscoelasticity and non-linear response to shear
… oscillatory shear deformation as a function of frequency and amplitude of deformation, film thickness and normal pressure using the modified surface forces apparatus technique. The investigation of the frequency spectra of linear viscoelastic response as a function of the film thickness with …
-
THE EFFECTS OF A LARGE OSCILLATING FIELD IN MAGNETIC RESONANCE; A STUDY BY LOW FREQUENCY DOUBLE ELECTRON MUON RESONANCE
… has recently been applied to fused quartz at low frequency enabling us to see directly how the spin precesses in perpendicular dc and rf magnetic fields of comparable strength. The precessional frequency spectra are in excellent agreement with predictions by numerical integration of the equations …
-
Fiber optic modal domain sensing of structural vibrations
… characterize the sensor's behavior. We compare frequency spectra of the sensor output with calculated frequency components of the structures to determine if the sensor is responding to the various structural harmonics. Specifically, we wish to demonstrate the dynamic range and frequency response …
-
Detection of fiber fracture in Unidirectional Fiber Reinforced Composites using an In-Plane Fiber Optic Sensor
… The results of AE analysis (signal amplitude, frequency spectra, MARSE, and in-plane displacement) caused by simulated fiber fracture experiments and other types of mechanical loading in FRP test coupons are reported. The applications to the development of FRP structural health monitoring …
-
Analysis of single event transients in arbitrary waveforms using statistical window analysis
… detect transient events or for time-averaging of frequency spectra. A generalized window function is demonstrated using the Ionizing Radiation Effects Spectroscopy (IRES) technique to enhance the measurement of transient anomalies within arbitrary waveforms. The IRES filter convolves time data …
-
Nonlinear effects near an explosions
… the size of this nonlinear region and the frequency spectrum of the elastic signal. The computation of the size of the shattered zone, shows that this region is bounded by a so called "Critical Radius," which occurs when the shock wave pressure caused by the explosion decreases in value …
-
Experimental Investigation of Transonic Shock Oscillations on NACA 0018 at Incidence
… code was developed to display the spatial power spectral density distribution in the region of the shock. This code calculated the frequency spectrum at regular points along the range of shock motion and plotted the spatial distribution of frequency spectra across all the points. This identified …
-
Design and characterization of a smart bit for in-situ force measurement, using capacitive load cells and acoustic spectra analysis to determine rock type and tool wear in rock excavation process
… the Support-Vector machine using fast Fourier spectra magnitude of short duration samples of signal, around 0.2 seconds, performed the best. Other machine learning methods explored for classification applications in this research include multi-layer perceptron neural networks and k-nearest …
-
Underwater sound radiation from single large raindrops at terminal velocity: the effects of a sloped water surface at impact
… studied only for small drops. Average energy spectra were calculated for a range of raindrop sizes striking a smooth water surface. This work deals with the real life situation of large raindrops of a size often present in heavy rainfall (4.6 mm diameter) striking a sloped water surface. …
-
Electrodynamic sensors and neural networks for electrical charge tomography.
… correlation based velocity determination and spectral analysis of electrodynamic signals. A single charged-particle model is developed to simulate the induction effect on a sensor by a charge. The spatial representation of the voltage induced onto sixteen sensors, placed on the boundary of a …
-
Spectral description of low frequency oceanic variability
… various observations to provide an approximate spectral description of low frequency oceanic variability. Such a spectrum has wide application in oceanography, including the optimal design of observational strategy for the deployment of floats, the study of Lagrangian statistics and the estimate …
-
Enhanced vertical mixing within mesoscale eddies due to high frequency winds in the south China sea
… velocity field displays high sensitivity to the frequency of the wind forcing. If the wind field contains energy at the inertial frequency or higher (daily and six-hourly cases), then Vortex Rossby waves and near inertial waves are excited as ageostrophic expression of the vigorous eddy field. …
-
Evaluation of the Energetic Factors in Crystalline Pharmaceuticals Using Solid-state Density Functional Theory and Low-frequency Vibrational Spectroscopy
… hydrates, and cocrystals. In this work, low-frequency vibrational spectroscopies and rigorous quantum mechanical simulations are combined to provide a new technique for characterizing and investigating pharmaceutically relevant polymorphs, hydrates, and cocrystals as well as a series of model …
-
One-dimensional wave spectrum analysis of wind waves off Cape Town
… varying from 12 - 140 metres. One dimensional frequency spectra were computed from the records, by power spectrum analysis, based on the method of Blackman and Tukey, using an I.B.M. 1130 Computer. Assumptions of normality and stationarity were tested. The Gaussian assumption of the waves was …
Page 1 of 4