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 5813 for “"ratios"”.
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Temperature-insensitive line ratios
We develop method to extract elemental abundance ratios using temperature-insensitive ratios of x-ray line fluxes for a collisionally ionized plasma. This method is then refined using more realistic plasma models for coronae of active stars. We finally apply the method to multiple sources and …
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Sr87/Sr86 ratios, K/Rb ratios, and rare-earth element abundances in pyroxene granulites.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1969.
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Extracting damping ratios using wavelets
… the accuracy of methods for extracting damping ratios with respect to: three extraction methods, different damping ratios, added noisy data, separated modes and close modes. To achieve this goal, a simulated analytical signal is analyzed by estimating the modal parameters. The simulated analytic …
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Stable isoperimetric ratios and hyperbolic geometry
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Riesz capacity: Hausdorff measure and extremal ratios
Riesz capacity measures the size of a set in $\mathbb{R}^n$ in terms of a pairwise interaction kernel $|x-y|^{-p}$ with exponent $p In the first part of the dissertation, the decay rate of Riesz capacity as the exponent $p$ increases to $n$ is shown to yield the Hausdorff measure of the set. The …
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Optimising subdomain aspect ratios for parallel load balancing
In parallel adaptive Finite Element simulations the work load 011the individual processors can change frequently. To (re)distribute the load evenly over the processors a load balancing heuristic is needed. Common strategies try to minimise subdomain dependencies by minimising the number of cut …
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Light hydrocarbon ratios as biosignatures of microbial activity
… coupled with calculated methane – ethane ratios, can be used to inform future studies, particularly with regard to astrobiological research.
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Essays on Fertility and Sex Ratios in India
… have experienced a rapid increase in their sex ratios at birth. This dissertation examines the causes and consequences of these imbalances in the Indian context. Lower desired fertility can translate into more male-biased sex ratios if son preference remains strong, especially with greater …
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Limiting Behavior of a Sequence of Density Ratios
Made available in DSpace on 2014-12-05T22:27:22Z (GMT). No. of bitstreams: 1 6202993.pdf: 1721574 bytes, checksum: 0f7ceed821bc6ae3738661e51f421cb8 (MD5) Previous issue date: 1962
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Analysis of signal transduction networking using activation ratios
… structure from a set of measured activation ratios, with activation factors yielding a measure of activation potential between intermediates. This framework was tested using computational simulations of a small-scale interconnected network, cascades with feedback, and in the presence of …
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Isotope ratios in source determination of formaldehyde emissions
… effect continuously lowers the product isotope ratios as a function of yield. If such isotope fractionation did not occur, it would be a simple matter to quantify contributions of wood and UF resin to formaldehyde emissions using static isotope ratios. Isotope fractionation, therefore, …
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Retrieval Advances of BrO/SO2 Molar Ratios from NOVAC
Measurements of magnitude and composition of volcanic gas emissions allow insights in magmatic processes. Within the Network for Observation of Volcanic and Atmospheric Change(NOVAC) automatically scanning UV-spectrometers are monitoring gas emission at volcanoes. The emissions of BrO and SO2 can …
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SR87/SR87 ratios in anorthosites and some associated rocks
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1967.
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Effect of time horizon on incremental cost-effectiveness ratios
… time horizon on incremental cost-effectiveness ratios when comparing two strategies. Methods: Two strategies for a patient are compared: new or usual treatment. A hypothetical model based on US life tables (for a 64-year old) assumed that the new and usual treatment strategies resulted in …
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Going by the Book: Valuation Ratios and Stock Returns
I explore how institutional frictions interact with the changing nature of the book value of equity to impact stock returns. I first find that book-to-market is relatively less informative of future returns when it significantly deviates from other valuation multiples, and employing refined signals …
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Evaluation of Thyroid to Background Ratios in Hyperthyroid Cats
… injection error during scintigraphy. T:B and T:S ratios, and % dose uptake on scintigraphy were then compared to serum T4 by linear regression analysis for 39 cats. Sixteen cats were excluded because of recent methimazole or Y/D diet use, or incomplete data. The heart ROI correlated best to plasma …
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Evolutionary demography of structured two-sex populations and sex ratios
Males and females may differ in stage-specific survival, maturation, fertility, or mating availability. These demographic differences, in turn, affect population growth rates, equilibrium structure, and evolutionary trajectories. Models considering only a single sex cannot capture these effects, …
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