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 124 for “"Frequency Content"”.
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Two-dimensional spatial frequency content and confusions among dot matrix characters
… matrix characters to the two-dimensional spatial frequency similarity of these characters. During the first phase of the study, subjects were shown single alphanumeric characters from four different dot matrix fonts. In addition to the font variable, the size of the character was varied. All …
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Effect of ground motion frequency on non-structural seismic damage
… effect of peak ground acceleration, while the frequency content of seismic activities remains largely unexplored. In order to better understand the impact of low magnitude seismic activities on non-structural damage, we develop an assessment method for a specific site by comparing structural …
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Detection, Identification and Classification of Suck, Swallow and Breathing Activity In Premature Infants During Bottle-Feeding
… specific application.In the second approach, the frequency content of each signal was investigated to study the relationship between the shape of each waveform and the frequency content of that specific signal. Spectral analysis for suck, swallow and breathing signals showed that the shape of the …
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Analyzing the Effect of Moving Resonance on Seismic Response of Structures using Wavelet Transforms
… includes the variation of signal composition (frequency content) with time (spectral nonstationarity).The phenomenon of moving resonance which occurs when the frequency content of the ground motion shifts in a similar manner as the natural frequencies of the structural response, is likely a …
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Effects of varying inertial load on human wrist movement
… and speed, and hand tremors were tested. The frequency content seen in the natural speed trials was found to resemble a normal distribution. This higher area of frequency content could potentially correlate with the frequency of hand tremors. After analysis of overshoot, there was found to be …
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Experiments to study seismic drift of reinforced concrete structures
… strength and initial period of the specimen, and frequency content and intensity of simulated earthquake motions.
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Differences in image properties across facial expressions: effects on perceived contrast, stimulus efficacy and oculomotor responses
… expressions are driven by their low spatial frequency content. Unaddressed by this account, however, is the extent that expressions of fear compared to other faces differ in terms of the statistical image properties that define facial stimuli (their Fourier amplitude spectra), and the extent …
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Modeling of nonstationary earthquake ground motion and biaxial and torsional response of inelastic structures
… model is proposed in which both intensity and frequency content are functions of time. Corresponding methods for estimating the model parameters based on actual earthquake records are also given. The proposed ground motion model can be efficiently applied to simulations as well as analytical …
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Shear Madness: Signal-Dependent and Metaplectic Time-Frequency Representations
Time-frequency representations are multidimensional transformations that indicate the joint time-frequency content of a signal. Representations such as the wavelet transform, the short-time Fourier transform, and the Wigner distribution have proven to be powerful tools for signal analysis and …
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Effect of Sound Cue Frequency Filters on Front/Back Localization Performance for Three-Dimensional Verbal and Non-Verbal Warnings
… is to determine whether or not altering the frequency content of auditory warning signals could affect the localization performance for forward and backward presentation of the signals. The results confirmed previous research conducted by Ehmann (2001) which found that altering the frequency …
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Comparisons of harmony and rhythm of Japanese and English through signal processing
… are different in terms of harmony, rhythm, and frequency of sound. Voice samples of 5 native speakers of English and Japanese were collected and analyzed through fast Fourier transform, autocorrelation, and statistical analysis. The harmony of language refers to the spatial frequency content of …
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Algorithm for Spectral Matching of Earthquake Ground Motions using Wavelets and Broyden Updating
… The study include the baseline drift, the frequency and time resolution, and the cross correlation between wavelet adjustments during the spectra matching procedure. Based on this study, the corrected tapered cosine wavelet was selected to be used in the proposed algorithm. The proposed …
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Design and Testing of Off-The-Shelf Electronic Components for an Acoustic Emission Structural Health Monitoring System Using Piezoelectric Sensors
… signal. A high pass filter attenuates the low frequency content of a signal, while a low pass filter attenuates the high frequency content of a signal. A line driver converts a low current signal to a high current signal. All of these components need to operate up to a frequency of 2 MHz. …
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Signal processing techniques for on-line partial discharge monitoring of high voltage electrical machines.
… methods are investigated in order to measure the frequency content of partial discharges. This had never been attempted before, primarily due to the lack of suitable technology. Finally, a suitable frequency analysis algorithm was developed and applied to experimental data, in order to investigate …
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Compact power conditioning and RF systems for a high power RF source
… and low inductance shunt to produce high frequency RF as an alternative to HPM sources. Three geometries of the RF system were investigated with capacitances ranging from 275 pF to 730 pF. A tri-plate system was built as a proof of principle of operation of the RF system with the power …
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Frequency Analysis and Sheared Filtering for Multidimensional Effects in Rendering
… filter that is customized to each pixel's frequency content. We finally present practical algorithms that share samples between pixels, reduce sampling requirements by an order of magnitude, and provide significant speedups for many of the most expensive computations in computer graphics.
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Approximating the Seismic Amplification Effects Experienced by Solar Towers Mounted on the Rooftops of Low-Rise Industrial Buildings
… 30 historical ground motion records of varying frequency content. Based on the results of the time history analyses, modifications to the ASCE 7-05 provision specific to roof-mounted solar towers are proposed.</p>
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Universal Atrial Coordinate (UAC) for Wall Motion Deep Learning
… Fourier transform (FFT), showed coordinated low-frequency contraction in SR and reduced amplitude with higher-frequency content in AF. The framework enables anatomy-independent motion comparison and has the potential to predict AF signatures using SR data alone.
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Some aspects of vibration serviceability in wood floor systems
… rated and tested to determine fundamental frequency values. This database of wood floor systems was used to provide further validation of a recently proposed design criterion which uses fundamental frequency to predict acceptability of wood floor systems to vibrations resulting from human …
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IMAGE-BASED MODELING AND PREDICTION OF NON-STATIONARY GROUND MOTIONS
… are characterized by time-varying amplitude and frequency content, and the response of nonlinear structures is sensitive to the temporal variations in the seismic energy input, ground motion non-stationarities should be taken into account in simulations. This paper describes a nonparametric …
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