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Articles 1351 - 1380 of 1876
Full-Text Articles in Physical Sciences and Mathematics
Hypoxic Water Transport By Sub-Tidal Circulation From Chesapeake Bay To The Lower Rappahannock Estuary, Ned Burger
Hypoxic Water Transport By Sub-Tidal Circulation From Chesapeake Bay To The Lower Rappahannock Estuary, Ned Burger
Dissertations, Theses, and Masters Projects
No abstract provided.
Virginia's Pelagic Recreational Fishery: Biological, Socioeconomic And Fishery Components, Eleanor A. Bochenek
Virginia's Pelagic Recreational Fishery: Biological, Socioeconomic And Fishery Components, Eleanor A. Bochenek
Dissertations, Theses, and Masters Projects
Catch, effort, fleet size and boat owner expenditure data were collected on Virginia's recreational marlin/tuna fishery for the 1983-1985 seasons. Logbooks, dockside interviews and a telephone survey were evaluated to determine which method was the most efficient and effective for collecting and estimating catch and effort for Virginia's pelagic recreational fishery. In 1984, logbooks were used to collect catch and effort data and fishing effort was estimated using Bochenek's method. Very few fishermen returned their logbooks and as a result this data is probably less reliable than the data collected in other years. Due to the poor return of logbooks, …
Subsurface Hydrodynamics And Nutrient Exchange Within An Extensive Tidal Freshwater Wetland, William G. Reay
Subsurface Hydrodynamics And Nutrient Exchange Within An Extensive Tidal Freshwater Wetland, William G. Reay
Dissertations, Theses, and Masters Projects
Located between upland and riverine systems, extensive tidal freshwater wetlands are influenced by a variety of recharging water sources and their respective nutrient contents. Conversely, tidal wetlands discharge interstitial waters and solutes to surface waters during periods of aerial exposure. Geohydrologic and model simulation methodology were utilized in order to aid in the understanding of wetland subsurface flow dynamics, its influence upon pore water nutrient chemistry, and its role in nutrient exchange with adjacent surface waters. Interstitial water nutrient chemistry was monitored along three transects extending from the uplands to the creekbank edge. Surface waters were also monitored throughout the …
Effect Of Water Column Ph And No3 On Ortho-Phosphate Release Rates From Freshwater Sediments, Beverly Eloise Baker
Effect Of Water Column Ph And No3 On Ortho-Phosphate Release Rates From Freshwater Sediments, Beverly Eloise Baker
Dissertations, Theses, and Masters Projects
No abstract provided.
Palatability Of Freshwater Surface Hemiptera To Potential Fish Predators (Lepomis Macrochirus And Gambusia Affinis), Julie Heyward Mounts
Palatability Of Freshwater Surface Hemiptera To Potential Fish Predators (Lepomis Macrochirus And Gambusia Affinis), Julie Heyward Mounts
Dissertations, Theses, and Masters Projects
No abstract provided.
Interactive Simulations For Knowledge Acquisition, Sorel Bosan
Interactive Simulations For Knowledge Acquisition, Sorel Bosan
Dissertations, Theses, and Masters Projects
No abstract provided.
Effect Of Nitrogen And Phosphorus Enrichment On Lipid And Fatty Acid Composition Of Estuarine Microplankton, Jia Chen
Dissertations, Theses, and Masters Projects
No abstract provided.
The Standing Stock Of Organic Matter In A Man-Made Brackish Marsh And Its Resource Management Implications, Pamela Anne Mason
The Standing Stock Of Organic Matter In A Man-Made Brackish Marsh And Its Resource Management Implications, Pamela Anne Mason
Dissertations, Theses, and Masters Projects
No abstract provided.
Effects Of Selected Nitrogen-Containing Aromatic Compounds (Ncacs) On Physiological Properties In Escherichia Coli, W. James Catallo Iii
Effects Of Selected Nitrogen-Containing Aromatic Compounds (Ncacs) On Physiological Properties In Escherichia Coli, W. James Catallo Iii
Dissertations, Theses, and Masters Projects
This research examined the effects of quinoline and 4-azafluorene on respiratory electron transport rate (ET), outer membrane permeability and topology, oxygen consumption, and viable cell density in Escherichia coli cell suspensions. ET was estimated spectrophotometrically using INT (2-(p-iodophenyl)-3-(p-nitrophenyl)-5-(phenyl)-2H-tetrazolium chloride, which is reduced in vivo to a red colored formazan (INTF). Both test compounds caused anomalous dose-response behavior in INT assays: in a defined window of doses, ET rates near or above the controls were observed. These doses showed altered INT reduction kinetics, decreased cellular oxygen demand, and decreased viable cell densities. Experiments with E. coli spheroplast preparations, gram(+) cells, and …
Automated Data Acquisition For Analysis Of Fly Ash By Graphite Furnace Atomic Absorption Spectrophotometry, Eileen Dowds
Automated Data Acquisition For Analysis Of Fly Ash By Graphite Furnace Atomic Absorption Spectrophotometry, Eileen Dowds
Dissertations, Theses, and Masters Projects
No abstract provided.
A Kinetic Study Of The Oxidative Addition Of Simple Alkylvinyl Triflates To Tetrakis (Triphenylphosphine) Platinum(O), C. P. Desmond Longford
A Kinetic Study Of The Oxidative Addition Of Simple Alkylvinyl Triflates To Tetrakis (Triphenylphosphine) Platinum(O), C. P. Desmond Longford
Dissertations, Theses, and Masters Projects
No abstract provided.
Distribution Analysis Of Heavy Minerals On The Inner Continental Shelf Of Virginia, Hakan Ozalpasan
Distribution Analysis Of Heavy Minerals On The Inner Continental Shelf Of Virginia, Hakan Ozalpasan
Dissertations, Theses, and Masters Projects
No abstract provided.
The Influence Of Salinity On The Swimming Behavior Of Larval Crassostrea Virginica (Gmelin), Kevin J. Mccarthy
The Influence Of Salinity On The Swimming Behavior Of Larval Crassostrea Virginica (Gmelin), Kevin J. Mccarthy
Dissertations, Theses, and Masters Projects
No abstract provided.
Small-Kernel Image Restoration, Stephen Edward Reichenbach
Small-Kernel Image Restoration, Stephen Edward Reichenbach
Dissertations, Theses, and Masters Projects
The goal of image restoration is to remove degradations that are introduced during image acquisition and display. Although image restoration is a difficult task that requires considerable computation, in many applications the processing must be performed significantly faster than is possible with traditional algorithms implemented on conventional serial architectures. as demonstrated in this dissertation, digital image restoration can be efficiently implemented by convolving an image with a small kernel. Small-kernel convolution is a local operation that requires relatively little processing and can be easily implemented in parallel. A small-kernel technique must compromise effectiveness for efficiency, but if the kernel values …
Carbon, Nitrogen, And Phosphorus Discharge From The Altamaha River, Georgia, Frederick A. Hoffman
Carbon, Nitrogen, And Phosphorus Discharge From The Altamaha River, Georgia, Frederick A. Hoffman
Dissertations, Theses, and Masters Projects
No abstract provided.
Pcb Congener Analysis With Hall Electrolytic Conductivity Detection, Robert D. Edstrom
Pcb Congener Analysis With Hall Electrolytic Conductivity Detection, Robert D. Edstrom
Dissertations, Theses, and Masters Projects
This work reports the development of an analytical methodology for the analysis of PCB congeners based on integrating relative retention data provided by other researchers. The retention data were transposed into a multiple retention marker system which provided good precision in the calculation of relative retention indices for PCB congener analysis. Analytical run times for the developed methodology were approximately one hour using a commercially available GC capillary column. A Tracor Model 700A Hall Electrolytic Conductivity Detector (HECD) was employed in the GC detection of Aroclor standards and environmental samples. Responses by the HECD provided good sensitivity and were reasonably …
Bottom Sediment Mobility At The Wolf Trap Site In The Lower Chesapeake Bay, Mary Mckean Howard-Strobel
Bottom Sediment Mobility At The Wolf Trap Site In The Lower Chesapeake Bay, Mary Mckean Howard-Strobel
Dissertations, Theses, and Masters Projects
No abstract provided.
Cannibalism Experiments With The Blue Crab (Callinectes Sapidus Rathbun): Potential Effects Of Size And Abundance, Christopher A. Peery
Cannibalism Experiments With The Blue Crab (Callinectes Sapidus Rathbun): Potential Effects Of Size And Abundance, Christopher A. Peery
Dissertations, Theses, and Masters Projects
No abstract provided.
Meristic And Morphometric Comparison Of Three Juvenile Alosa Species: Blueback Herring, A Aestivalis; Alewife, A Pseudoharengus; And American Shad, A Sapidissima, Joseph C. Desfosse
Meristic And Morphometric Comparison Of Three Juvenile Alosa Species: Blueback Herring, A Aestivalis; Alewife, A Pseudoharengus; And American Shad, A Sapidissima, Joseph C. Desfosse
Dissertations, Theses, and Masters Projects
No abstract provided.
Mitochondrial Dna Variation In Striped Bass, Morone Saxatilis, From The Rappahannock River, Virginia, Carol Furman
Mitochondrial Dna Variation In Striped Bass, Morone Saxatilis, From The Rappahannock River, Virginia, Carol Furman
Dissertations, Theses, and Masters Projects
No abstract provided.
The Influence Of Tributyltin On Various Aspects Of Activation And Reactive Oxygen Formation In Oyster Toadfish (Opsanus Tau) Macrophages, Charles D. Rice
The Influence Of Tributyltin On Various Aspects Of Activation And Reactive Oxygen Formation In Oyster Toadfish (Opsanus Tau) Macrophages, Charles D. Rice
Dissertations, Theses, and Masters Projects
The effects of tributyltin (TBT) on phorbol myristate acetate (PMA)- and calcium ionophore (A23187)-stimulated peritoneal macrophages from oyster toadfish (Opsanus tau) were evaluated in a luminol-dependent chemiluminescence (CL) assay. PMA-stimulated CL responses were increased by in vitro exposure to 50 ug/L TBT, but depressed to baseline values by 500 ug/L TBT. A23187-stimulated CL increased with 5 ug/L and 50 ug/L TBT, and depressed by 500 ug/L TBT. Responses stimulated by synergistic doses of PMA and A23187 were increased by 50 ug/L TBT and depressed by 500 ug/L TBT. Enhanced PMA- and A23187-stimulated CL following TBT exposure returned to baseline values …
Uptake Kinetics And Toxicity Of Diazinon In The American Oyster, Crassostrea Virginica Gmelin, Ruth L. Williams
Uptake Kinetics And Toxicity Of Diazinon In The American Oyster, Crassostrea Virginica Gmelin, Ruth L. Williams
Dissertations, Theses, and Masters Projects
Several aspects of effects of the organophosphate pesticide diazinon on the American oyster Crassostrea virginica Gmelin were investigated. Uptake of diazinon directly from water was compared with uptake of diazinon sorbed to either fine sediment or algae; the primary route of assimilation seems to be from the water. Concentrations of diazinon between 0.91 and 2.03 mg/L inhibit shell growth during 96 hours of exposure; there is a sharp threshold of effect for this response which is probably an indirect one caused by lack of food during shell closure. Acetylcholinesterase inhibition is significant in oyster heart tissue at concentrations of approximately …
Local Density Approximation Study Of Transition Andf-Electron Materials, Zhi Wei Lu
Local Density Approximation Study Of Transition Andf-Electron Materials, Zhi Wei Lu
Dissertations, Theses, and Masters Projects
The local density approximation (LDA) has been proved to be a powerful starting point for calculating electronic and structural properties for many real materials. We have studied the effects of particular forms of exchange-correlation potentials (the X{dollar}\alpha{dollar} and Hedin-Lundqvist form) upon the structural properties for the 3d Ti and 4d Zr using a highly accurate linearized augmented plane wave (LAPW) method. The calculated equilibrium volumes differ by 6-8% for these two forms (with X{dollar}\alpha{dollar} results in better agreement with experiment) with proportional differences in other structural properties, which we take to be an indication of the intrinsic reliability of the …
A Search For The Rare Decay Kaon(L) Going To Muon/Electron, John Fred Ginkel
A Search For The Rare Decay Kaon(L) Going To Muon/Electron, John Fred Ginkel
Dissertations, Theses, and Masters Projects
A sensitive search has been carried out for the rare decay $\rm K\sb{L}\to\mu e$. This decay violates conservation of separate lepton-number and thus is forbidden in the Standard Model of electro-weak interactions. Many new models have been proposed which could permit this process. The data were collected in the B5 beamline of the Alternating Gradient Synchrotron facility at the Brookhaven National Laboratory during the Spring, 1988 slow-extracted beam running period. The experiment was sensitive to approximately fifty million $\rm K\sb{L}\to\pi\pi$ decays. No $\rm K\sb{L}\to\mu e$ candidate events were detected. The 90% confidence level upper limit for the branching ratio is …
A Measurement Of The Decay Rate For The Process Kaon(L) Going To Positive Muon Negative Muon, Christopher John Kenney
A Measurement Of The Decay Rate For The Process Kaon(L) Going To Positive Muon Negative Muon, Christopher John Kenney
Dissertations, Theses, and Masters Projects
A sample of 87 events of the GIM suppressed decay K$\sb{\rm L} \to \mu\sp+\mu\sp-$ were observed in an experiment performed in 1988 at the Brookhaven National Laboratory. Concurrently, 8,887 examples of the CP-violating decay K$\sb{\rm L} \to \pi\sp+\pi\sp-$ were also seen. The apparatus consisted of a double-magnet spectrometer as well as electromagnetic and muon detector systems. From the previously measured branching ratio for K$\sb{\rm L} \to \pi\sp+\pi\sp-$ and the different instrumental acceptances of the detector for the two decays, the data sample was normalized to the effective number of K$\sb{\rm L}$ decays observed. A value for the ratio (K$\sb{\rm L} …
Task-Oriented Display Design: Concept And Example, Terence S. Abbott
Task-Oriented Display Design: Concept And Example, Terence S. Abbott
Dissertations, Theses, and Masters Projects
No abstract provided.
Aspects Of Volume Regulation In Two Estuarine Invertebrates: Glycera Dibranchiata (Annelida) And Modiolus Demissus (Mollusca), Ana Marie Beardsley
Aspects Of Volume Regulation In Two Estuarine Invertebrates: Glycera Dibranchiata (Annelida) And Modiolus Demissus (Mollusca), Ana Marie Beardsley
Dissertations, Theses, and Masters Projects
No abstract provided.
Dielectric Monitoring Of Environmental Effects On The Cure Of Epoxy-Polyamide Coatings, Thomas Hamilton
Dielectric Monitoring Of Environmental Effects On The Cure Of Epoxy-Polyamide Coatings, Thomas Hamilton
Dissertations, Theses, and Masters Projects
No abstract provided.
Non-Lattice Monte Carlo Simulations Of Polymer Motion, David Albert Eichinger
Non-Lattice Monte Carlo Simulations Of Polymer Motion, David Albert Eichinger
Dissertations, Theses, and Masters Projects
No abstract provided.
Monitoring Environmental Effects On High Performance Tetraglycidyl Methylenedianiline Epoxy And Pmr-15 Polyimide, William Robinson Hayes Clark
Monitoring Environmental Effects On High Performance Tetraglycidyl Methylenedianiline Epoxy And Pmr-15 Polyimide, William Robinson Hayes Clark
Dissertations, Theses, and Masters Projects
No abstract provided.