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 50 for “"peak frequency"”.
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Geographic variation in the echolocation calls of the endemic Cape horseshoe bat, Rhinolophus capensis (Chiroptera: Rhinolophidae)
… factors are suggested to influence call frequency divergence in high duty-cycle bats. Investigating these factors within the framework of established hypotheses would contribute to understanding evolutionary changes leading to speciation in bats. Here, acoustic divergence between …
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Development of a method for calculation of cardiac output using Doppler ultrasound
… used to measure cardiac output by measuring the peak frequency, which is directly proportional to the velocity of blood flowing in the aorta, associated with the Doppler shift signal when an ultrasound beam is incident on the aorta. Stroke volume is the product of the cross sectional area of the …
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Statistical study of solar radio bursts
The peak flux distribution of 40 years of solar radio burst data recorded by NOAA, as a function of frequency and time over a wide range of frequencies, was investigated to quantify the potential impact of radio bursts on wireless systems. Tables of fit parameters, which can be used to find burst …
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Bat Skull Evolution: the Impact of Echolocation
… call design (i.e., number of harmonics, constant frequency, quasi-constant frequency and frequency modulation components) and some have evolved multiple times in different lineages. Therefore, I tested the effect of emission type and call design on the relationship between peak frequency and skull …
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A turbulent combustion noise model
… (4) the thermoacoustic efficiency, (5) the peak frequency, and (6) the sound power of combustion generated noise. In addition, a correlation for sound power is developed based on fundamental burner and fuel variables known to affect the acoustic characteristics of turbulent combustion. The …
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Numerical Simulation of Three-Dimensional Aerodynamic Behavior of a Yawed, Inclined Circular Cylinder
… in this study. As yaw angle increases, the peak frequency of Cy deviates from the prediction by the Cosine Rule. The dominant frequency of Cx has a relatively low-frequency component and increases with yaw angle, but it cannot be predicted by the Cosine Rule. The comparison results indicate …
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Interactions between the cholinergic and dopaminergic system during the production of ultrasonic vocalizations in rats
… characterized by relatively constant (flat) frequency with peak frequency ranging from 19 to 28-kHz, and a call duration ranging between 100 – 3000 ms. These vocalization can be induced by cholinomimetic agents injected into the ascending mesolimbic cholinergic system that terminates in the …
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The Effects of Dance on Motor and Non-Motor Functions, and Resting State Electroencephalography in Individuals With Parkinson's Disease and Age-Matched Controls
… significant changes in both individual alpha peak frequency (iAPF) and individual alpha peak power (iAPP). CONs showed a global increase in iAPF during eyes open (EO) rsEEG and in iAPP during both eyes closed (EC) and EO conditions. Individuals with PD showed an increase in iAPP lateralized to …
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Interacting Ultracold Alkali Atomic Fermion Gases and Radio-Frequency Spectroscopy
The last chapter focuses on radio-frequency spectroscopy of multi component fermion gases. Rf experiments of 6Li and 40K are first reviewed. We show that rf experiments essentially measure spin correlation functions, and internal symmetries of the interparticle interactions constrain the rf …
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A self-tuning 100 watt wireless power transfer system
… in transfer distance, which shifts the resonance peak frequency and hence requires automated control. An automated system comprised of a 100 watt switching power amplifier coupled to a frequency controller is designed and implemented. The desired operating frequency is determined by quantification …
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An Investigation of multisensory integration: Does peak occipital beta frequency directly influence the Flash Tap illusion?
… investigate a proposed relationship between the peak frequency of occipital beta and the temporal binding window (Cooke, Gillmeister, Romei & Wilson, In preparation) for the Flash Tap illusion first proposed by Violentyev, Shimojo and Shams (2005). Seventeen participants from the University of …
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Experimental measurement of combustion noise and comparison to a predictive model
… conditions. The data were evaluated based on peak frequency and overall sound pressure level. The experimental data are also compared to a predictive model.
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Ada : context-sensitive context-sensing on mobile devices
… determine the movement mode, Ada uses a new peak frequency feature from acceleration magnitudes, combining it with two other features. We present results from trace-driven experiments over carefully labeled data from real users, finding that our mode-of-movement detector achieves an accuracy …
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Seismic scattering attributes to estimate reservoir fracture density : a numerical modeling study
… the base reservoir reflection show spectral peaks corresponding to the fracture density. Frequency versus wavenumber plots for receivers normal to the fractures separate backscattered events that correspond to spectral peaks with positive wavenumbers and relatively narrow frequency ranges. In …
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Comparison of five oral cannabidiol preparations in adult humans: pharmacokinetics, body composition, and heart rate variability
… assessed using dual energy X-ray absorptiometry. Peak circulating CBD concentration, time to peak concentration, and area under the curve was superior in a preparation comprising 5% CBD concentration liquid. Fat free mass was a significant predictor (R2 = 0.365, p = 0.017) of time to peak …
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Gravitational Waves in String Cosmology
… provide arguments supporting the claim that the peak amplitude cannot be made parametrically larger in field theory for a given reheating temperature. We then develop a Boltzmann equation approach to string thermodynamics and study a scenario where the early universe features a Hagedorn phase, …
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The effects of load and humidity on friction and life of polymeric coatings used to prevent fretting corrosion
… 45 and 55%. Amplitude of oscillation was 330 μm peak to peak, frequency of oscillation was 40 Hz, and the coating thickness was 25 μm. Statistically significant variables and interactions are identified, and reasons for their significance are discussed. Increasing the humidity had no consistent …
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Anoxia-Induced Changes in Action Potential Propagation in a Non-Myelinated Axon
… showed significantly fewer APs and a lower peak frequency compared to controls. Brief application of sodium azide (NaN3) as an acute metabolic inhibitor did not subsequently affect DCMD’s conduction velocity or ability to fire at high frequencies during the recording period. There were no …
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The entrainment of brain oscillations through transcranial alternating current stimulation (tACS) delivered at off-peak frequencies.
… the possibility of modulating endogenous frequency peaks, through entrainment, from stimulation delivered at off-peak frequencies. Study 1 utilised EEG recordings to establish whether off-peak stimulation within the alpha frequency range could successfully shift individual alpha peak …
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Conformational relaxation and kinetic hole-burning in sperm whale myoglobin
… with time as the ligands rebind and the peak frequency shifts toward the deoxy value. The peak shift can be due to two different mechanisms: kinetic hole-burning and conformational relaxation. Kinetic hole-burning results from different parts of an inhomogeneously broadened spectrum …
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