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 45 for “"spectral power"”.
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Exploring Neural Activities in the Prefrontal Cortex of Fragile X Syndrome Mouse Models Using Electroencephalography
… EEG studies have identified alterations in gamma power, alpha slowing, cross-frequency coupling, and reduced signal complexity, suggesting potential translational biomarkers of network dysfunction. However, the extent to which these signatures are conserved in preclinical models—especially in …
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POWER SPECTRAL ANALYSIS OF SURFACE MYOELECTRIC SIGNALS DURING DYNAMIC CONTRACTIONS
… myoelectric signals (MES) requires the use of power spectral analysis for effective characterisation. Spectral changes during different types of muscular activity are monitored using spectral parameters like mean power frequency, ratios of powers in several arbitrarily chosen spectral bands and …
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Advanced Orthogonal Frequency-Division Multiplexing Systems with Cyclic Prefix-Less Multiple-Input and Multiple-Output Discrete Fourier Transform Spreading and Unmanned Aerial Vehicles-Assisted Cyclic Postfixed Windowed Schemes
In the proper designing of spectrally efficient 5th Generation (5G)/Beyond 5G (B5G) systems, minimization of Peak-to-Average Power Ratio (PAPR) of the time domain Orthogonal Frequency-Division Multiplexing (OFDM)/Cyclic Prefix (CP)-less OFDM signal and reduction of baseband signal Out-of-Band (OOB) …
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Effect of Moderate Versus High-Intensity Interval Exercise Training on Heart Rate Variability Parameters in Inactive Latin-American Adults: A Randomised Clinical Trial
… and frequency domain: HFLn, high-frequency spectral power; LF, low-frequency spectral power and HF/LF ratio) were measured at baseline and 12 weeks thereafter. The SDNN changes were 3.4 (8.9) ms in the MCT group and 29.1 (7.6) ms in the HIT group (difference between groups 32.6 [95% CI, 24.9 …
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Mapping the Spatial and Temporal Dynamics of Sensorimotor Integration During the Perception and Performance of Wallowing
… (~10 Hz) and beta (~20 Hz) frequency bands. Spectral power within these frequency bands are known to index somatosensory and motor activity, respectively. Twenty-five adult participants produced swallowing and tongue tapping (motor control) tasks. Additionally they were asked to watch a video …
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An Experimental Investigation of Pressure Fluctuations in Three-Dimensional Turbulent Boundary Layers
… = 0.600 and x/L = 0.772, in this type of flow. Spectral scaling is discussed and various scaling combinations of the spectral power density of surface pressure fluctuations beneath two-dimensional boundary layers that cover a wide range of Reynolds number (1400 < Re(theta) < 23400) are …
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Optimal resource sharing and spectrum leasing in energy efficient relay-assisted networks
… pairs, referred to as the primary pair, owns the spectral resources while the other pair, called the secondary pair, is considered to own the relay infrastructure. Assuming amplify-and-forward relaying scheme and aiming to establish a cooperation between the two networks, we study three different …
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Development of ground-based search -coil magnetometer systems in the polar regions and studies of ULF Pc 1--2 wave propagation in the ionospheric waveguide
… band-limited ULF Pc 1--2 waves with poleward spectral power attenuation over a very extensive latitudinal coverage from geomagnetic latitudes of --62° to --87° (over the distance of 2920 km). This is a clear indication of the propagation of the electromagnetic ion cyclotron (EMIC) …
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Energy management in biomedical applications : wireless power and biosensing
… smaller devices with more functionality compels power-centric strategies in every aspect of design. Long-term implantables such as neural implants for the treatment of Parkinson's disease and epilepsy traditionally rely on primary cell batteries, which occupy a large portion of the implant volume …
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A multi-scale modeling study of the impact of land surface heterogeneity on the convective boundary layer in the U.S. Midwest
… was also clearly depicted in the enhanced spectral power of the moisture flux convergence (MFC) field for periods when rainfall was more likely to be locally forced. Importantly, this study provides new evidence on the influence surface heterogeneity in lower boundary layer forcing, such as …
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Sleep under stress: the complex web of fear, hypervigilance and mental health in a low socioeconomic status community in South Africa
… Frequency domain variables are derived from the spectral power of the electrocardiography signal and include very low, low and high frequency power measures (VLF, LF and HF power, respectively). VLF and HF power reflect sympathetic withdrawal and parasympathetic input, respectively while LF is …
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Automated classification of power signals
… associated software convert the V/I signal to spectral power envelopes that can be searched to determine when a transient occurs. The identification of this signal can then be determined by an expert classifier and a series of these classifications can be used to diagnose system failures or …
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Discerning nonlinear brain dynamics from EEG : an application to autistic spectrum disorder in young children
… conducted in this direction, mainly computing spectral power and coherence. Perhaps due to methodological limitations, together with high variability within and between the cohorts investigated, results have not been in complete agreement, and it is therefore still the case that the diagnosis …
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Development of microcantilever mid-infrared detectors and sources and their application in infrared spectroscopy
… with the wavelengths of 3 – 30 um. This spectral range includes the dominant wavelengths of the thermal radiation emitted by objects at or near room temperature, and vibrational and rotational resonance frequencies of many molecules. The detection and generation of mid-IR light, thus, …
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Resting-State EEG Spectral Activity in Children and Adolescents with ASD: Potential Correlations with Interoceptive Neocortical Areas
… variables included absolute, peak, and relative spectral power across standard EEG frequency bands (Delta, Theta, Alpha, Beta, Gamma). Separate MANCOVAs were conducted for each frequency band, followed by univariate ANOVAs to identify specific electrode-level differences.</p> <p>This …
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Composite structure of tropical cyclones in the SW Indian Ocean
… the recurving TC on the poleward side. Spectral analysis of a rainfall index compiled from Mauritius data demonstrates spectral peaks at the seasonal and intra-seasonal scale. Three peaks were identified. one within the 40-60 day Madden Julian Oscillation. one at 23 days and one with a …
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Photochromic textiles
… demonstrated. Differences in the effect of the spectral power distributions of light sources on the photochromic response are also examined. Bi-exponential functions, which are used in optical yield (Oy) calculations, have been described to provide a good description of the kinetics of colour …
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Colour analysis and the classification of fruit
… and they are: colours represented by spectral power distributions and spectral reflectance curves; the CIE 1931 XYZ tristimulus values; the CIE 1931 x ,y ,z chromaticity coordinates; the CIE 1960 L, u, v uniform chromaticity scale (UCS); the Munsell colour wheel of hue, value and …
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On the origins of the ice ages : insolation forcing, age models, and nonlinear climate change
… variability which both scale according to simple spectral power-laws. To complement the spatial and temporal analysis of temperature variability, a description of the full insolation forcing is also developed using Legendre polynomials to represent the spatial modes of variability and singular …
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Power velocity integral technique for quantification of flow in valvular heart disease
… the backscattered ultrasound . As backscattered spectral power is hypothesized to be proportional to the sonified blood volume, and spectral frequency is directly related to velocity of flow, the product of power and velocity should be proportional to flow. However, researchers have long assumed …
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