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Articles 1 - 22 of 22
Full-Text Articles in Physical Sciences and Mathematics
Hilda: The Flexible Design And Implementation Of A Database Machine Executive, Paul Anthony Fishwick
Hilda: The Flexible Design And Implementation Of A Database Machine Executive, Paul Anthony Fishwick
Dissertations, Theses, and Masters Projects
No abstract provided.
Energy Utilization In Bay Anchovy And Black Sea Bass Eggs And Larvae Contrasting Ecological Roles, John Wotring Tucker Jr
Energy Utilization In Bay Anchovy And Black Sea Bass Eggs And Larvae Contrasting Ecological Roles, John Wotring Tucker Jr
Dissertations, Theses, and Masters Projects
The objective of this study was a comparison of developmental changes and energy utilization in eggs, unfed larvae, and fed larvae of two marine fish species that both have pelagic early stages, but differ in phylogeny and early life ecology. The bay anchovy (Anchoa mitchilli), a clupeiform, spawns in estuaries and shallow coastal waters. The black sea bass (Centropristis striata striata), a perciform, spawns offshore at 15-50 m depths. Densities of zooplankton eaten by first-feeding fish larvae are normally higher in coastal waters than offshore. An important determinant of survival of larval fishes is their ability to fulfill nutritional requirements …
Striped Bass Management In The Chesapeake Bay, Thor John Lassen
Striped Bass Management In The Chesapeake Bay, Thor John Lassen
Dissertations, Theses, and Masters Projects
No abstract provided.
Organic Toxic Substances Monitoring In Virginia, Robert Emile. Croonenberghs
Organic Toxic Substances Monitoring In Virginia, Robert Emile. Croonenberghs
Dissertations, Theses, and Masters Projects
This project attempts to identify toxic organic substances used in Virginia, which cannot be detected by conventional analytical procedures. A list from the Virginia Bureau of Toxic Substances Information which contained substances reported as used in manufacture or produced in Virginia was cross-referenced with the Master File of toxic substances compiled pursuant to the Toxic Substances Control Act. Organic chemicals appearing on both lists were thus identified as toxic substances used in Virginia, and were the subjects of this research. Due to the reporting requirements of the Virginia Toxic Substances Information Act, the 113 "compounds" do not include substances used …
The Peregrine Falcon In Virginia: Survey Of Historic Eyries And Reintroduction Effort, Johannes Kurt Gabler
The Peregrine Falcon In Virginia: Survey Of Historic Eyries And Reintroduction Effort, Johannes Kurt Gabler
Dissertations, Theses, and Masters Projects
No abstract provided.
Solvolysis Of 1-T-Butylvinyl Trifluoromethanesulfonate, Barbara L. Gross
Solvolysis Of 1-T-Butylvinyl Trifluoromethanesulfonate, Barbara L. Gross
Dissertations, Theses, and Masters Projects
No abstract provided.
Catastrophes In The Elmo Bumpy Torus, Alkesh R. Punjabi
Catastrophes In The Elmo Bumpy Torus, Alkesh R. Punjabi
Dissertations, Theses, and Masters Projects
Experimentally it is observed that the plasma in Elmo Bumpy Torus (EBT) shows discontinuous changes in the electron line density, electron and ion temperatures and fluctuation levels as the ambient gas pressure or electron cyclotron heating is varied continuously. We use the Point Model of Hedrick et al. for the toroidal core plasma in EBT. The Point Model is not a gradient dynamic system. Hence the Elementary Catastrophe Theory is not directly applicable to the Point Model. Nonetheless, the Point Model equilibria will be shown to exhibit properties which are quite akin to the canonical cusp catastrophe. The ambipolar electric …
Long-Time States Of Inverse Cascades In The Presence Of A Maximum Length Scale, Murshed Hossain
Long-Time States Of Inverse Cascades In The Presence Of A Maximum Length Scale, Murshed Hossain
Dissertations, Theses, and Masters Projects
It is shown numerically, both for the two-dimensional Navier-Stokes equations and for two-dimensional magnetohydrodynamics, that the long-time asymptotic state in a forced inverse-cascade situation is one in which the spectrum is completely dominated by its own fundamental. The growth continues until the fundamental is dissipatively limited by its own dissipation rate. An algebraic model is proposed for the dynamics of such a final state.
A General Theory Of Electron Detachment In Negative Ion Collisions, Tzuu-Shin Wang
A General Theory Of Electron Detachment In Negative Ion Collisions, Tzuu-Shin Wang
Dissertations, Theses, and Masters Projects
In this thesis a general theory of electron detachment in slow collisions of negative ions with atoms is presented. The theory is based upon a semiclassical close-coupling framework, following the work of Taylor and Delos. The Schrodinger equation is reduced, under certain assumptions, to a non-denumerably infinite set of coupled equations. We develop a new method for solving these equations that is more general than the methods used by Taylor and Delos. A zero-order approximation of our solution is applied to the case of H('-)(D('-)) on Ne collisions, the results are compared with the experimental data, and we find good …
An Environmental Model Predicting The Relative Recruitment Success Of Blue Crab, Callinectes Sapidus (Rathbun), In Chesapeake Bay, Virginia, Andrew Jackson Applegate
An Environmental Model Predicting The Relative Recruitment Success Of Blue Crab, Callinectes Sapidus (Rathbun), In Chesapeake Bay, Virginia, Andrew Jackson Applegate
Dissertations, Theses, and Masters Projects
No abstract provided.
A Precision Measurement Of The Magnetic Moment Of The Sigma Minus Hyperon, David William Hertzog
A Precision Measurement Of The Magnetic Moment Of The Sigma Minus Hyperon, David William Hertzog
Dissertations, Theses, and Masters Projects
A new measurement of the magnetic moment of the (SIGMA)('-) hyperon has been made and the result is (mu)((SIGMA)('-)) = -1.111 (+OR-) 0.031 (+OR-) 0.011 nuclear magnetons.;Negative kaons from a low-energy separated beam at the Alternating Gradient Synchrotron of the Brookhaven National Laboratory were brought to rest in a novel laminar target consisting of thin metal foils immersed in liquid hydrogen. The production of (SIGMA)('-) hyperons occurred primarily through the reaction K('-)p(--->)(SIGMA)('-)(pi)('+). (SIGMA)('-) hyperon production was tagged by the identification of the energetic (pi)('+). Many of the (SIGMA)('-) so produced stopped in nearby foils of Pb (or W) where …
Climate Scale Environmental Factors Affecting Year-Class Fluctuations Of Atlantic Croaker (Micropogonias Undulatus) In The Chesapeake Bay (Maryland, Virginia), Brenda L. Norcross
Climate Scale Environmental Factors Affecting Year-Class Fluctuations Of Atlantic Croaker (Micropogonias Undulatus) In The Chesapeake Bay (Maryland, Virginia), Brenda L. Norcross
Dissertations, Theses, and Masters Projects
A conceptual life history of the Atlantic croaker (Micropogonias undulatus) identifies the effects of the environment on juvenile recruitment. In a multi-disciplinary approach to modelling, the major effects are investigated, quantified and presented in a flow chart. The model is divided into three sub models, each representing a major component which affects juvenile recruitment. North/south spawning location in the Mid-Atlantic Bight is affected by the bottom water temperature as influenced by the cessation of the summer winds in relation to timing of croaker migration. The pelagic phase is the most critical time in the life history of a larval croaker …
Modeling Of Water Quality In Estuaries And Estuarine Networks (Virginia, Maryland), Yothin Unkulvasapaul
Modeling Of Water Quality In Estuaries And Estuarine Networks (Virginia, Maryland), Yothin Unkulvasapaul
Dissertations, Theses, and Masters Projects
A one dimensional finite element model for the prediction of transient water quality in an estuary is developed. Ten water quality constituents, salinity, coliform bacteria, organic nitrogen, ammonia nitrogen, nitrite-nitrate nitrogen, organic phosphorous, inorganic phosphorous, phytoplankton as measured by chlorophyll 'a', DO and CBOD are included in the model. The effects of temperature, solar radiation and zooplankton predation are incorporated into the model as external forcing functions. The concentration distributions are obtained by solving the conservation of mass equations successively. A compatible hydrodynamic model is also developed to provide the driving transport processes to the water quality model. The finite …
On Water Masses Of The Red Sea, Mohamed Zaki Moustafa
On Water Masses Of The Red Sea, Mohamed Zaki Moustafa
Dissertations, Theses, and Masters Projects
No abstract provided.
Evaluation Of Sediment Sources And Sinks: A Sediment Budget For The Rappahannock River Estuary, Craig G. Lukin
Evaluation Of Sediment Sources And Sinks: A Sediment Budget For The Rappahannock River Estuary, Craig G. Lukin
Dissertations, Theses, and Masters Projects
No abstract provided.
Effect Of Molecular Weight On Polyphenylguinoxaline Properties, Brian J. Jensen
Effect Of Molecular Weight On Polyphenylguinoxaline Properties, Brian J. Jensen
Dissertations, Theses, and Masters Projects
No abstract provided.
Nmr Study Of Molecular Motions In Two Disordered Organic Solids, Philip L. Kuhns
Nmr Study Of Molecular Motions In Two Disordered Organic Solids, Philip L. Kuhns
Dissertations, Theses, and Masters Projects
The molecular motions are studies in two disordered materials that undergo glass transitions. Glycerol is a conventional glass former and cyclohexanol is an orientational glass former.;The technique used in the glycerol experiments was spectral hole burning. Chemical shift anisotropy produces inhomogeneous broadening of NMR lines in orientationally disordered and polycrystalline solids. By saturating or inverting a portion of the anisotropic line, 'burning a hole', molecules of certain orientations are tagged. Subsequent molecular reorientations result in spectral diffusion which is not related to spin-spin interactions. By measuring the broadening and recovery of the hole as a function of time, detailed knowledge …
Accumulation Of Toxic Organic Pollutants In The Blue Crab Callinectes Sapidus (Aromatic Hydrocarbons, Gas Chromatography, Polychlorinated Biphenyls, Virginia), Robert C. Hale
Dissertations, Theses, and Masters Projects
Levels of toxic organic pollutants (TOP) were examined in the blue crabs, Callinectes sapidus, of Virginia waters. Alkyl substituted polynuclear aromatic hydrocarbons (ASPAH), thought derived from weathered petroleum, were the most common organic pollutants present. Unsubstituted aromatics, heterosubstituted aromatics, polychlorinated biphenyls (PCB), and DDT metabolites were also detected by the analytical procedure employed. Highest levels of ASPAH were found in crabs from the heavily industrialized Hampton Roads area of the James River. Lower concentrations were detected in crabs from the Pocomoke Sound, the upper James and the Rappahannock River sampling sites. PCB levels were elevated in samples taken from both …
On The Occurrence And Origins Of Hopanoids In The Chesapeake Bay (Maryland, Virginia), Gullaya Wattayakorn
On The Occurrence And Origins Of Hopanoids In The Chesapeake Bay (Maryland, Virginia), Gullaya Wattayakorn
Dissertations, Theses, and Masters Projects
Analyses of surface sediment samples from the Chesapeake Bay and sediment cores from the James and the Potomac River showed that pentacyclic triterpenoids of the hopanoid skeleton were ubiquitously present in all samples. The hopanoids have been identified and quantified by gas chromatographic retention data obtained on SE-52 stationary phase, and mass spectral comparisons with the branched/cyclic fraction of a Lorraine coal extract as well as published data from authentic standards. Hopanoid acids are of extended 17(beta)(H), 21(beta)(H)-structure, ranging from C(,31) to C(,33). The 17(beta)(H), 21(beta)(H)-bishomohopanoic acid (C(,32)) is always the major acid found in the samples. All acids were …
Niche Relations Among Polychaetes Of A Meso-Polyhaline Assemblage In The York River, Virginia, Michael Joseph Kravitz
Niche Relations Among Polychaetes Of A Meso-Polyhaline Assemblage In The York River, Virginia, Michael Joseph Kravitz
Dissertations, Theses, and Masters Projects
No abstract provided.
A Mathematical Model For Small Tidal Streams Capable Of Simulating Both Short-Term And Long-Term Water Quality Variations, Stephen Anthony Williams
A Mathematical Model For Small Tidal Streams Capable Of Simulating Both Short-Term And Long-Term Water Quality Variations, Stephen Anthony Williams
Dissertations, Theses, and Masters Projects
No abstract provided.
Age, Growth And Reproduction Of American Eels, Anguilla Rostrata, (Lesueur), From The Chesapeake Bay Area, Marion Yvonne Hedgepeth
Age, Growth And Reproduction Of American Eels, Anguilla Rostrata, (Lesueur), From The Chesapeake Bay Area, Marion Yvonne Hedgepeth
Dissertations, Theses, and Masters Projects
No abstract provided.