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 23 for “"decay model"”.
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A Bayesian stormwater quality model and its application to water quality monitoring
… this research was to study the application of a decay treatment model as a conceptual tool for understanding the pollutant removal characteristics of stormwater systems. Three systems were studied in this research: a sand filter, a gravel wetland, and a retention pond. The contaminants under …
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Through Iron & Ice: Searching for Sterile Neutrinos at the IceCube Neutrino Observatory
… as the most promising portal for Beyond Standard Model (BSM) physics, and neutrinos have already provided fruitful surprises. A number of neutrino experiments in the last three decades have observed anomalous oscillation signals consistent with a mass-squared splitting of Δ𝑚2 ∼ 1 eV^2, motivating …
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The Photosynthetic Action Spectra of the Phytoplankton and Their Role in Governing Spatial and Temporal Distribution: A Numerical Modeling Approach
<p>In the present study a numerical modeling approach is employed to examine the role of division spedific differences in photosynthetic action spectra in governing the relative size of diatom and dinoflagellate carbon synthesis along various marine light regime gradients. A radiative transfer …
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The spatial and institutional factors of knowledge production at MIT
… and collaboration, well fit with an exponential decay model, that is consistent for papers, patents, and for specifically cross-disciplinary work. These insights contribute an architectural dimension to the field of scientometrics, taking a first step toward empirical foundations for applied …
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An investigation into the phenomenological relation between solar activity and nuclear beta-decay rates
… experimental evidence for time-varying nuclear decay rates, in contrast to the widely-accepted view that nuclear decaying isotopes disintegrate at a constant rate unaffected by external conditions. We study several past cases of radioactive isotopes exhibiting annual periodicities in their decay …
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Measurement of the Ratio of Charged and Neutral 𝐵 Mesons in Υ (4𝑆) Events via Partial Reconstruction of the Semileptonic Decays 𝛣̅⁰⟶𝐷<sup>∗</sup>⁺ℓ⁻<sub>𝜈̅ℓ</sub> and 𝛣̅⁻⟶𝐷<sup>∗</sup>⁰ℓ<sub>𝜈̅ℓ</sub>
The decays, <img width=119 height=32 align=center src=https://vtechworks.lib.vt.edu/bitstream/handle/10919/28846/image006.gif> and <img width=119 height=29 align=center src=https://vtechworks.lib.vt.edu/bitstream/handle/10919/28846/image008.gif> are studied using data collected at the CLEO II …
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Bacterial influence on uranium oxidation reduction reactions : implications for environmental remediation and isotopic composition
… found to fit well to a first order exponential decay model. Using this model we have determined the dependence of the rate of bacterial uranium reduction on several parameters, including bacterial density and pH. Understanding the reduction kinetics is also an important step in the determination …
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Sensitivity of economic performance of the nuclear fuel cycle to simulation modeling assumptions
… implications require a fuel cycle simulation model as complete and realistic as possible. In this thesis, methodological implications of modeling choices are discussed in connection with development of the MIT fuel cycle simulation code CAFCA. The CAFCA code is meant to find the recycling …
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Diurnal analysis of intensity trends in Atlantic tropical cyclones
… for land-filling TCs, even after using the decay model of Kaplan and DeMaria (1995) to find diurnal departures from mean decay rates. We also calculate theoretical TC indices using Atlantic TC dropsonde data from NOAA NHC over years 2002-2005 and 2011-2012. The indices, which measure …
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Population pharmacokinetics and pharmacokinetic-pharmacodyamic modeling of antitubercular drugs
… were described using non-linear mixed effects modeling. Pharmacodynamic data was comprised of weekly sputum liquid culture (using mycobacterial growth indicator tubes) time to detection results from 144 patients during the first 2 months of treatment. The effect of drug exposure on patient …
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Three-Dimensional Modeling of Solute Transport with In Situ Bioremediation Based on Sequential Electron Acceptors
A numerical model for subsurface solute transport is developed and applied to a contaminated field site. The model is capable of depicting multiple species transport in a three-dimensional, anisotropic, heterogeneous domain as influenced by advection, dispersion, adsorption, and biodegradation. …
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Coarse Woody Debris in Industrially Managed Pinus taeda Plantations of the Southeastern United States
… Measurements included piece size, position, and decay class. Samples of CWD were collected and analyzed to determine their mass and density. Decomposition rate of CWD was significantly different across position classes and decay classes: disk decomposition rates were significantly negatively …
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Passive Seismic Tomography and Seismicity Hazard Analysis in Deep Underground Mines
… tomographic imaging survey. An initial velocity model is established according to properties of a rock mass, then velocity structure is reconstructed by velocity inversion to reflect the anomalies of the rock mass. Mining-induced seismicity and double-difference tomographic images of rock mass in …
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Synthesis, Characterisation and Device Application of Silicon Nanoparticles produced by Mechanical Attrition
… time ts well with a rst order exponential decay model which was used to evaluate the limiting particle size as about 120nm. The structural properties of the nanocomposites was investigated using small angle X-ray scattering, while the electrical properties were investigated by conducting I …
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Departure from nucleate boiling and pressure drop prediction for tubes containing multiple short-length twisted-tape swirl promoters
… analysis of existing CHF correlations and models. Initially a phenomenological model was sought to describe the mechanisms of CHF for tubes containing MSLTTs; however, the full-length twisted-tape (FLTT) model that was selected for modification was found to have terms that could not be …
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On convective penetration of a buoyant plume into a stably stratified layer
… the frequency selection using a linear viscous decay model. Finally, we formulate a parameterisation of moisture which retains the essential processes involved in convective hydration of the condensation/sublimation of vapour/ice and sedimentation of ice. Using this model, we explore the …
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Inter-relationship of mechanical and bio-chemical processes governing the settlement of municipal solid waste (MSW) using the (C +H)/L ratio
… gas volumes determined from a first order decay model based on the USEPA LANDGEM model. The values obtained as part of this research were determined for a loading increment of 2.56 tons per square foot (tsf) for all samples, unless otherwise stated, and indicate that C' _c varies from …
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Inhibition, attentional control, and causes of forgetting in working memory: a formal approach
… included go, and no-go steps. The interference model (IM; Oberauer & Kliegl, 2006), a model proposing interference-related mechanisms as the main cause of forgetting was used to simultaneously fit the data of these age groups. In addition to the interference-related parameters reflecting …
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Modeling of Groundwater Heavy Metals and Methane Pollution for a Municipal Landfill Utilizing Data Driven and Numerical Modeling Techniques
… shows original results to the advancement of modeling of groundwater heavy metal pollution and methane generation as the main two concerns in landfilling for a municipal landfill. To better understand the context of thesis, it has been divided into six major studies. The first part of the …
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Hydrology across scales : sensitivity of East African lakes to climate changes
… catchment. The availability of digital elevation models (DEM) and gridded climate data sets facilitates the comparison of the morphological and hydroclimatic conditions of rift lakes. I used the hypsometric integral (HI) calculated from Shuttle Radar Topography Mission (SRTM) data to describe the …
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