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 21 for “"Q-value"”.
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Tobin's Q for Canadian firms
Defined as the ratio of market value to replacement cost of tangible assets, Tobin's q is commonly used as a performance measure in research. Although the use of the q ratio is theoretically appealing, its empirical construction is subject to considerable measurement error. In this thesis, we …
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The association of prematurity and medical conditions with the gut microbiome of mammals
… lambs, the anatomical site explained 54% (q-value=0.0004) of the variance in microbial beta diversity but that there was no significant effect of early-life nutritional supplementation on the microbial diversities of preterm lambs. However, prematurity per se explained 5.7% (q-value=0.024) of …
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Zebra Crosswalk Detection Assisted by Neural Networks
… while reducing the false discovery rate (q-value) from 20% without using neural networks to 2.21% using this neural network method. Only 2.04% of non-crosswalk images as crosswalks using the neural network method.</p>
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On Solving Larger Games: Designing New Algorithms Adaptable to Deep Reinforcement Learning
… convergence to the NE. Chapter 5 proposes Q-value based Regret Minimization (QFR), which achieves all three properties simultaneously.
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The effect of aberrations and light scatter on visual performance at photopic and mesopic light levels
… were probably not the cause of the foveal dip. Q value lenses consisting of Q = -2, Q = -1, Q = 0, Q = +1 and Q = +1.5 contact lenses were tested on subjects with natural pupils, to determine whether the CAA test could pick up larger non-physiological changes in aberrations. Large changes in …
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Intrinsically Localized Lattice Vibrations in Crystalline Lattices
… at ▁k (π/2,π/2,π/2) for a certain threshold value of ▁q, and coalesces at the upper-edge of the two-phonon density of states spectrum with high degeneracy in the two-phonon critical energy. We conclude that the excitation spectra of the pairs of harmonic phonon excitations become …
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On-chip Spiral Inductor/transformer Design And Modeling For Rf Applications
… (VCO) design, for its quality factor (Q) value directly affects the VCO phase noise. The optimization of inductor layout can improve its performance, but the improvement is limited by selected technology. Inductor performance is bounded by the thin routing metal and small distance from …
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High-Precision Half-Life Measurement of Oxygen-14
Precision measurements of the ft values for Superallowed Fermi beta decays between nuclear isobaric analogue states of spin-parity Jπ= 0+, T = 1 provide fundamental tests of the electroweak interaction. These transitions are used to constrain the conserved vector current (CVC) hypothesis and …
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Search for neutrinoless double-beta decay and 42Ar in enriched xenon using the EXO-200 dataset
… No signal excess was observed near the 0νββ Q-value, leading to a limit on the 0νββ half-life in 136Xe of T_(1/2)^0ν >3.0×10^25 yr and Majorana neutrino mass 〈m_ββ 〉<(100-309) meV, both reported at the 90% confidence level (CL). The corresponding sensitivity of 4.2×10^25 yr (90% CL) represents …
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Tidal Dissipation in Extrasolar Planets
… inside the planet may explain the observed Q value. The only normal modes that fall in the frequency range of the tidal forcing (~ few days) are inertial modes, modes restored by the Coriolis force. We present a new numerical technique to solve for inertial modes in a convective, rotating …
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Integration of glass microspheres and planar waveguides for microsphere lasers
… for a fused silica microsphere. This high Q value represents many promising characteristics such as low cavity loss, long cavity life time, and narrow band width. With their remarkable characteristics, microsphere resonators can be used in various applications such as the narrow band filter, …
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Development of drilling optimization models for autonomous rotary drilling systems.
… analyzes a batch of real-time data using a Q-value algorithm to select the pair of surface operating parameters. The findings showed that application of these models could improve drilling performance by 30-60% compared to best offset well. Moreover, it will enhance operational health and …
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Optimization Study of the Stripline Resonator Technique for Dielectric Characterization
… frequencies, the coupling reaches its peak value for a given stripline resulting in excessive loading to the resonator and thus a lowered Q value. In this frequency range, measurement of the dielectric properties looses its accuracy because the lowered Q values which means inaccuracies in …
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The Thermal Stabilisation of Austenite at Sub-Zero Temperatures
… immediately follows the initial quench; lower Q values are obtained when this transformation is curtailed. This effect complicates the dependence of Q on ageing temperature and prior martensite content. Short quench treatments produce a C-curve dependence of Q on ageing temperature with a minimum …
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Transcriptional Regulation of kal-1 in the Nematode Caenorhabditis elegans
… expressed in the transcriptome with a q-value of less than 0.05. The transcriptome suggested that <em>cnd-1</em> regulation covered a variety of pathways including ubiquitination and synaptic vesicle control. Finally, this thesis details the beginning of a new endeavor to determine if …
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Ability of Caries Detection Methods to Determine Caries Lesion Activity
… volume and maximum depth correlation with △Q value at 15 s from QLF during dehydration. Materials and Methods: Thirty extracted human premolars exhibiting non-cavitated approximal white spot early lesions stored in 0.1.-percent thymol/4C and treated with 5.0-percent NaOCl/30 min were included …
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Advancing high power microwave spark-gap technology : design and analysis of a coaxial ringdown oscillator
… output voltages, and a suboptimal Q-factor (Q) values, which reduces the amount of energy coupled to a target at a specific frequency. Therefore, the aim of this thesis is to design, fabricate, test, and evaluate a novel CRO using a systematic methodology to optimize its performance, increase …
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The magnetostratigraphy of Coniacian-Late Campanian chalk sequences of Southern England
… Lat.=73.0"N). However, though the Q value (van der Voo, 1988) of this palaeopole is low (Q=5) this pole position helps to confirm the palaeomagnetic pole of Heller & Channell (1979) derived from Late Cretaceous limestone (83 Ma) of the Miinster Basin, Germany (Long.=181°E, Lat.=76°N). …
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A Novel Inverse Charge Constant On-Time Control for High Performance Voltage Regulators
… this challenge, an auto-tuning method for Q-value control is also proposed in this dissertation.
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Q Models for Lg Wave Attenuation in the Central United States
A series of small- to moderate-sized earthquakes occurred in Arkansas, Oklahoma and Texas from 2010 to 2012, coinciding with the arrival of the EarthScope Transportable Array (TA). The data the TA recorded from those earthquakes provide a unique opportunity to study attenuation of the Lg phase in …
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