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 15 of 15 for “"frequency dispersion"”.
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Measuring and modeling low frequency dispersion in GaAs MESFETs
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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In-situ deposition of high-k dielectrics on III-V compound semiconductor in MOCVD system
… and dimethylhydrazine (DMHy). However, the frequency dispersion of Capacitance-Voltage (C-V) curves for in situ AIN/GaAs samples are always large because of the existence of high interfacial defect state density (Dit) due to the nitridization of the GaAs surface during the AIN deposition. In …
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Spectroscopic characterisation of high dielectric constant materials on semiconducting surfaces
… substrates, the elimination of anomalous frequency dispersion of the accumulation capacitance of GaAs high dielectric constant (high-κ) MOS devices by the use of a passivating silicon interfacial layer has been investigated. It has typically been assumed that this affect is due to a high …
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Electrical studies on ion-etched n-GaAs(100) surfaces
… component of surface leakage current. The high frequency capacitance of ion-etched diodes is less than that of the virgin diodes. The low frequency capacitance of ion-etched diodes was found to be frequency dispersive. The extent of frequency dispersion diminishes at low temperatures and at low …
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FEM simulation of ultrasonic wave propagation in solid rods
… the experimental results. In addition, the input frequency, element size, and integration time step are discussed to evaluate the accuracy of the FEM results. The output waveform, wave velocity, and frequency components are compared between experimental and FEM results. A time-frequency domain …
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Low Frequency Dielectric Investigations on Hydrated Pharmaceutical Powders
… in the high millihertz to low megahertz frequency range. These materials are representative of two pharmaceutical technologies, viz. tabletting (including granulation) and the lyophilisation of proteins. A previously poorly characterised low frequency dispersion in MCC is shown to be a …
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Ultra-Wideband Channel Modeling using Singularity Expansion Method
… models do not account for all the identified dispersion mechanisms namely the frequency dispersion, the resonant dispersion and the multipath dispersion. The objective of this research is to model resonant dispersion based on the Singularity Expansion Method (SEM) and provide guidelines for …
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High Gain / Broadband Oxide Glasses For Next Generation Raman Amplifiers
… This led to the detection of an inherent frequency-dispersion in the Raman susceptibility and a resonant enhancement phenomenon when measurements were conducted near the absorption edge of the material.
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An Investigation into L2 Lexical Proficiency of Norwegian Secondary Learners
… examination, namely volume, variability, rarity, dispersion, evenness, and semantic disparity. Rarity in this study was examined based on the frequency information from three registers, which are general (i.e. frequency per million words), academic, and fiction. A total of 739 texts responding to …
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Study of deep level defects of N+-CdS/P-CdTe solar cells
… defect with activation energy 0.89eV is found. Frequency dispersion in Capacitance-Voltage measurements confirms the presence of Cu-related deep level traps for cells with a Cu evaporated back contact, whereas no such defects are observed in carbon paste contact. The behavior is believed to be …
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Transparent Tissues and Porous Thin Films: A Brillouin Light Scattering Study
… as a cause for the onset of presbyopia. High frequency (GHz) Brillouin light scattering (BLS) experiments were performed on human lenses spanning an age range from 30-70 years. The measured frequency shifts, and derived bulk moduli values were found tonot change significantly over the age span …
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In Situ Compressional Wave Velocity Across An Exposed Brittle Fault Zone
… the long wavelength effects of macrofractures, frequency dispersion, and partial saturation. The velocity profile is similar in width and consistent in velocity contrast to low S-wave velocity zones derived from fault zone guided waves in other strike-slip faults. The traveltime delay across the …
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Usage-based Analysis of Schematic and Multifunctional Verb Argument Constructions in Three Contrasting Corpora: A Native Chinese Corpus, a CFL Textbook Corpus and a Chinese Learner Corpus
… regularities in learners’ input, including the frequency, dispersion, and contingency of linguistic items. However, limitations to our understanding remain. A particularly notable gap relates to the fact that while numerous studies corroborate the effect of statistical properties in learners’ …
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Emission properties of radiative chiral nematic liquid crystals
… and along the director, for which we assume no frequency dispersion. Theoretical results are presented on the DOS in the region of the photonic band gap for a range of values of the loss coefficient and different values of the optical anisotropy. The obtained values of the DOS at the photonic …