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 260 for “"frequency band"”.
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Narrow frequency-band laser with optical feedback
… paper we discuss the construction of a narrow frequency-band laser with optical feedback. We use a distributed Bragg reflector (DBR) laser diode centered at the cesium D₂ transition wavelength, [gamma] = 852 nm. The linewidth of this diode is reduced by several orders of magnitude by means of …
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Weak interference direction of arrival estimation in the GPS frequency band
… arrival (DOA) of weak interferences in the GPS frequency band using antenna arrays. The main issues which affect weak GPS interference DOA estimation accuracy are the antenna array errors, interference from other GPS signals, the number of snapshots required for DOA estimation and system …
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A Code Division Multiple Access Communication System for the Low Frequency Band
… access (CDMA) communication system for the low frequency (LF) channel is proposed, discussed and analyzed. This LF/CDMA scheme is similar to classical CDMA schemes in that K users share a channel by phase modulating their transmissions with signature sequences. Our LF/CDMA scheme is different in …
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Study of Ds/ssma Receivers in the Low Frequency Band (Communications, Detection, Direct-Sequence, Multiple-Access, Spread-Spectrum)
Embargo set by: Seth Robbins for item 69513 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
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Design and Simulation of a Planar Crossed-Dipole Global Navigation Satellite System (GNSS) Antenna in the L1 Frequency Band
… (GNSS) receiver antenna to operate in GNSS L1 frequency band with multipath mitigation performance. First, a crossed-half-wavelength dipole antenna was designed to resonate centered at 1.6 GHz, and then various configurations were investigated and simulated. In an attempt to improve the …
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The Effects Of The Allocation Of Attention Congruent With Lateralized Cognitive Tasks On EEG Coherence Measurements
… values was found in the low alpha (8-10 Hz) frequency band. This provides evidence that the lower alpha frequency band is reflective of manipulations of attention. The higher coherence measures for the congruent orienting group indicates that homologous regions of the two hemispheres are more …
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Adjustable Frequency Bandgap for Seismic Vibration Isolation of MRE-Based Metamaterial Foundations
… the horizontal and vertical directions. When the frequency of seismic waves falls into the frequency band gap of the designed metamaterial foundation, the seismic waves will be reflected and will not be able to transfer the vibrations to the superstructure. Since earthquakes have a wide range of …
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The effects of periodic and non-periodic inputs on the dynamics of a medial entorhinal cortex layer II stellate cell model
… neuron types exhibit sub-threshold and firing frequency resonance in which the sub-threshold membrane potential or firing frequency responses to periodic inputs peak at a preferred frequency (or frequencies). Previous experimental work has shown that medial entorhinal cortex layer II stellate …
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Synchronization in digital communication systems: performance bounds and practical algorithms
… To avoid interference the available frequency spectrum is divided into non-overlapping frequency bands (bandpass channels) and each transmitter is assigned to a different bandpass channel. The transmission of a signal over a bandpass channel requires a shift of its frequency-content …
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X-band digitization systems aspects and filters for MeerKAT radio astronomy receiver
… by celestial sources at UHF-, L-, S- and X-band frequencies. With the development of the X-band receivers for MeerKAT scheduled to start in the near future, research is required to determine an optimum receiver design for this frequency band. There are two architecture options available for …
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Effect of high-beta versus gamma binaural beat exposure on immediate and delayed recall
… recall. Binaural beat exposure within the Gamma frequency band has been linked to alterations in neural connectivity and increased attention during working memory tasks, while stimulation in the Beta frequency band has been associated with increased memory performance. However, there is a lack of …
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Design of a Broadband Array Using the Foursquare Radiating Element
Broadband scanning arrays require small element spacing over a broad frequency band to achieve the desired scan capabilities. Previous research has concentrated on the development of small broadband elements to meet the demands of broadband arrays. However, mutual coupling between elements in a …
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The Use of High-Density ECoG for Functional Mapping and Neural Decoding
… with a wide spread power decrease in the low frequency band (LFB: 8–32 Hz), a more localized power increase in the high frequency band (HFB: 60–280 Hz) and ultra-high frequency band (UFB: 300–800 Hz) within the sensorimotor region. The temporal spatial spectral characteristics of the …
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Numerical Modelling of Plasmonic Waveguides
… spectral range (200 - 550 THz). The selected frequency band is chosen to ensure the existence of the CPP fundamental mode. The reported design offers a very high FOM at a low frequency band of (200-350 THz) compared to the well-known V-groove structure. However, the lateral mode radius of the …
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Frequency specific deficits in schizophrenia
… functional connectivity deficits and frequency specific deficits in schizophrenia. Coherence between different lobes of the brain from task related data at different frequency bands was investigated in patients with Schizophrenia (SP) and Healthy Normal Volunteers (HNV). The task was …
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Advances in iterative learning control with application to structural dynamic response reconstruction
… one defined over a different part of the test frequency band, instead of one model that covers the entire test frequency band; and the development and use of a new type of ILC algorithm. The contributions are implemented and demonstrated on a quarter vehicle road simulator, with favorable …
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Tactual display of consonant voicing to supplement lipreading
… amplitude-envelope signals derived from filtered bands of speech (i.e., envelopes derived from a lowpass-filtered band at 350 Hz and from a highpass-filtered band at 3000 Hz). Acoustic measurements made on the envelope signals of a set of 16 initial consonants represented through multiple tokens …
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Asic Design of RF Energy Harvester Using 0.13UM CMOS Technology
… San Luis Obispo, CA.The idea is to determine the frequency band which can provide maximum RF power for harvesting and design a harvester for that frequency band.</p>
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A reconfigurable low noise amplifier for a multi-standard receiver
… The first part is to design and implement wide band multi-standard multiband LNAs for two bands of interest (lower frequency band – 800 to 1000 MHz and upper frequency band – 1800 to 2200 MHz). These two bands should cover most of the 2G and 3G standards currently in use worldwide. In this work, …
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Models of Human Phone Transcription in Noise Based on Intelligibility Predictors
… is not spread uniformly over the time and frequency. We speculate that humans may use different representations of speech, depending on the phonetic context, and we suggest experiments controlling frequency-band specific signal-to-noise ratio and level to resolve these issues.
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