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 149 for “"Point sources"”.
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Point sources in cylindrically laminated rods
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.
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Pollution aspects derived from non-point sources
… runoff and for determination of whether non-point sources of pollution are great enough to be included in water pollution abatement programs. The Town of Blacksburg, Virginia, was the area of study with eleven sampling sites determined by size of drainage area and dominant land use existing …
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Reconstruction Resolution Of Coherent Point Sources With Helmholtz Equation Least Squares
… investigates the reconstruction of coherent point sources using Helmholtz Equation Least Squares (HELS) method based on measurements in violation of Nearfield Acoustical Holography (NAH) resolution guidelines. In HELS, the Helmholtz equation is solved by matching a series of localized …
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Autonomous Aerial Localization of Radioactive Point Sources via Recursive Bayesian Estimation and Contour Analysis
… determination of the positions and strengths of sources of dangerous radioactivity takes high priority after a catastrophic event to ensure the safety of personnel, civilians, and emergency responders. This thesis presents approaches and algorithms to autonomously investigate radioactive material …
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DESIGNING WATERSHED-SCALE STRUCTURAL BEST MANAGEMENT PRACTICES USING EVOLUTIONARY ALGORITHMS TO ACHIEVE WATER QUALITY GOALS
… lives and on the environment. There are two main sources of water pollution: point sources and non-point sources, which are differentiated based on their mode of generation. Pollution generated from point sources has been effectively controlled by the implementation of the National Pollution …
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New Approaches to Map-Making for Cosmic Microwave Background Observations
Extragalactic point sources are an additional foreground contaminant in CMB maps; proper identification and removal of these sources is a crucial step in the analysis pipeline. From the standpoint of Extragalactic Astrophysics, point source data from the WMAP instrument can provide important …
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Design of a watershed-based nitrogen trading system or the Big and Little Wood Rivers Watershed
… and 0.33 kg3/yr of surface water outflow. A point source/non-point source trading arrangement was set for the Watershed based on the currently high proportion of nonpoint nitrogen sources (e.g. agricultural lands and rangeland) and the future potential for increases in the proportion of …
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Nutrient load analysis of Lago de Yojoa, Honduras
… of the water quality. Loads were calculated for point sources, non-point sources, and other sources. These loads were applied to a trophic model to determine the lake's trophic status. The results of this study seem to point out that much about tropical limnology is unknown. Lake Yojoa appears to …
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Design and feasibility studies for a high energy neutrino detector / Janice Reid.
… detector intended to observe astrophysical point sources.
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Point source dispersion in a direct numerical simulation of turbulent channel flow
The dispersion of a scalar quantity from point sources located in a Direct Numerical Simulation of turbulent channel flow is studied. An algorithm for tracking fluid particles or molecular (or thermal) markers is developed and tested. Accurate estimates of a number of Lagrangian characteristics of …
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CLIMATE CHANGE IMPACTS ON THE SOIL EROSION AND NUTRIENT LOSSES IN THE GREAT LAKES REGION
Pollutants from non-point sources (NPS) have become the primary reason for water quality degradation in the Great Lakes region after great progress has been made in reducing point source pollution through the enforcement of total maximum daily loads (TMDL). Climate change may impact NPS pollutant …
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Analyzing Cost Implications of Water Quality Trading Provisions: Lessons from the Virginia Nutrient Credit Exchange Act
… was to estimate the cost implications of point source trading provisions of the Act. An integer programming cost minimization model was constructed to estimate the cost of achieving four point source trading policy scenarios. The model estimated the annual cost of meeting two different …
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Water quality modelling of eutrophied reservoirs in South Africa
… of 1 mg P04-P 1-1. This standard applied only to point sources, because of an initial belief that the contribution from non-point sources was relatively minor, and the absence of practical economic measures to control phosphorus discharges from non-point sources. Subsequent to introduction of the …
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Evaluating non-point source microplastic pollution and its impact on biota in the Huron River
… transported into waterways through a myriad of sources, including point sources such as wastewater treatment plants (WWTPs) and nonpoint sources, such as runoff. Microplastics can act as vectors for other CECs, such as non-steroidal anti-inflammatory drugs (NSAIDs), into biota. The goal of this …
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Investigating sources of microplastics and effects of plastic pollution on biofilm function in the Huron River
… MPs enter aquatic ecosystems through non-point sources such as urbanization, runoff, or atmospheric fallout or through point-sources such as wastewater treatment plants (WWTPs). To determine MP sources in the Huron River, we evaluated MP load (MPs/day) upstream and downstream from urban …
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Luminosity functions consistent with a pulsar-dominated Galactic Center Excess
… compare the predicted populations of resolved point sources to the Fermi 4FGL-DR2 point source catalog and a sub-population recently identified using wavelet-based methods. We provide general results that can be used to translate upper limits on the number of resolved point sources associated …
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A productivity study of the Roanoke River above Niagra Dam
… grab samples were taken from some of these points. The samples were analysed for general chemical parameters and the phosphorus and nitrogen concentrations. The "Algal Assay Procedure Bottle Test" was than run on the samples and on the sample with phosphorus and/or nitrogen spikes to …
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Phosphorus transport in the Berg River, Western Cape
… had to consider (1) export of phosphorus from nonpoint (diffuse) sources via surface and subsurface drainage, and from point sources such as wastewater treatment discharges, (2) transportation of phosphorus in the water prism along the river channel, taking account of removal and remobilization of …
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Efficiency calibration of a gamma-ray detector for measuring environmental radiation
… spectrometry. The measurements using reference sources of known activity were carried out using two sample holders (Marinelli Beaker (1000 ml) and, a cylindrical pill bottle (100 ml)), and a point source. The IAEA reference materials (RGU-1, RGTh-1 ore and RGK-1) were prepared and used to fill …
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Geospatial Trends of Per- and Polyfluoroalkyl Substances (PFAS) Incidence in Private Drinking Water in Virginia
… the impacts of contributing land cover types, point sources, household characteristics, and traditional water quality parameters on PFAS incidence across Virginia. Point-of-use samples (n=382) were collected from private wells across 10 counties and analyzed for 30 PFAS compounds using USEPA …
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