Physical Sciences and Mathematics Commons^™

Population Structure Of The White Perch, Morone Americana, In Lower Chesapeake Bay As Inferred From Mitochondrial Dna Restriction Analysis, Brian W. Bowen

Dissertations, Theses, and Masters Projects

No abstract provided.

A Trophic Resource Analysis Of Dominant Benthic Microfauna Of The Lower Chesapeake Bay, Douglas Vernon Huggett

Dissertations, Theses, and Masters Projects

No abstract provided.

The Effect Of Closed Classical Orbits On Quantum Spectra: Ionization Of Atoms In A Magnetic Field, Meng Li Du

Dissertations, Theses, and Masters Projects

A quantitative theory of oscillatory spectra for atoms in a magnetic field is developed. When an atom is placed in a magnetic field, and absorption spectrum into states close to the ionization threshold is measured, it is found that the absorption as a function of energy is a superposition of many sinusoidal oscillations. Such interesting and surprising phenomenon are fully explained and described by the theory.;The theory is based on three approximations: (1) Near the atomic nucleus, the diamagnetic field is negligible. (2) Far from the nucleus, the wave propagates semiclassically. (3) Waves returning to the nucleus are similar to …

A Stereospecific Approach To The Synthesis Of Pyrans, Mark M. Fukuda

Dissertations, Theses, and Masters Projects

No abstract provided.

Oyster Spatfall In Virginia Rivers: 1986 Annual Summary, James Whitcomb

Reports

The Virginia Institute of Marine Science (VIMS) conducts weekly surveys from June through early October to obtain oyster spatfall information. Spat counts are made on oyster shells strung on wire and suspended from stakes on public and private beds. The number of spat on shells is counted each week of the spawning season to determine the potential of a particular area for receiving a strike and to predict the most likely period the strikes will occur.

Shoreface And Beach Dynamics Of The Coastal Region From Cape Henry To False Cape, Virginia, L. D. Wright, C. S. Kim, C. S. Hardaway Jr., S. M. Kimball, M. O. Green

Reports

The processes which drive the beach and nearshore changes vary considerably in space and time. The spatial variability is the result of modulations of waves and wave induced processes by the complex topography of the shoreface and inner shelf fronting the beaches. In this study we employed a state-of-the-art computer model to evaluate the nature of these modifications and their impact on coastal processes. The model estimates wave modifications by shoaling, refraction, diffraction. and loss of wave energy by frictional interaction with the bottom.

Clay Mineral Distribution And Source Discrimination Of Holocene Sediments In Lower Chesapeake Bay, Virginia, Stephen A. Skrabal

Dissertations, Theses, and Masters Projects

No abstract provided.

Life History Of The Goosefish, Lophius Americanus, Michael P. Armstrong

Dissertations, Theses, and Masters Projects

No abstract provided.

Slow Collisions Of Hydride Ion And Deuteride Ion With Sodium, Potassium And Cesium, Yicheng Wang

Dissertations, Theses, and Masters Projects

The cross sections of charge transfer and electron detachment in collisions of H$\sp{-}$ and D$\sp{-}$ with Na, K and Cs have been measured for collision energies ranging from 3 to 300 eV. Both charge transfer and electron detachment are significant electron-loss mechanisms for H$\sp{-}$(D$\sp{-}$); both processes exhibit velocity-dependent isotope effects for H$\sp{-}$ and D$\sp{-}$. $\sigma\sb{\rm cg}$(E) displays high energetic thresholds for Na and K (about 20 eV for H$\sp{-}$ + Na and 40 eV for H$\sp{-}$ + K) yet no obvious one for Cs. $\sigma\sb{\rm e}$(E) does not depend on the target as much as $\sigma\sb{\rm ct}$(E) and displays near …

Sites And Diffusion Of Muons In Fcc Metal Hydride Systems, James Russell Kempton

Dissertations, Theses, and Masters Projects

A positive muon can be considered an isotope of hydrogen due to similarities in spin and charge. For metal hydride systems, the muon enters the sample "as the last hydrogen added," and competes for the same sites as the hydrogen atoms. to observe the site competition and diffusion of both particles (muon and proton), several FCC metal hydrides, TiH{dollar}\sb{lcub}1.83{rcub}{dollar}, TiH{dollar}\sb{lcub}1.97{rcub}{dollar}, TiH{dollar}\sb{lcub}1.99{rcub}{dollar}, YH{dollar}\sb{lcub}1.77{rcub}{dollar}, YH{dollar}\sb2{dollar}, ZrH{dollar}\sb{lcub}1.94{rcub}{dollar}, and LaH{dollar}\sb{lcub}2.06{rcub}{dollar}, were studied using transverse-, zero-, and low longitudinal-field {dollar}\mu{dollar}SR. The low temperature region results indicate that the muon predominately occupies octahedral sites for the FCC metal hydrides in this study. The probability for a …

Occurrence And Distribution Of Shell In The Vicinity Of Parker's Rock, Pocomoke Sound, Carl H. Hobbs Iii

Reports

This is a summary report on the investigation of the occurrence and distribution of shell in the vicinity of Parker's Rock. Pocomoke Sound. The investigation was performed by the Virginia Institute of Marine Science at the request and with the financial support of the Virginia Marine Resources Commission. The site (Figure 1) was selected. primarily. at the direction of the Commission. acting on the recommendation of its shell-dredging contractor and. secondarily. with supporting reconnaissance seismic data from VIMS.

Results Of Comparative Studies Of Preservation Techniques For Nutrient Analysis Of Water Samples, Betty A. Salley, Julie G. Bradshaw, Bruse J. Neilson

Reports

No abstract provided.

Primary Production And Temporal Variation In The Macrophytic Community Of A Tidal Freshwater Swamp, Bryan Keith Fowler

Dissertations, Theses, and Masters Projects

No abstract provided.

System Response Of A Nourished Beach In A Low-Energy Estuarine Environment, Gloucester Point, Virginia, Tracy Eanes Skrabal

Dissertations, Theses, and Masters Projects

No abstract provided.

Studies Of Pipefish Foraging In Simulated Seagrass Habitats, Clifford H. Ryer

Dissertations, Theses, and Masters Projects

Laboratory experiments determined the effects of two levels of habitat complexity upon pipefish (Syngnathus fuscus) foraging for amphipods. Habitats were composed of equal densities of either narrow (low complexity) or wide (high complexity) leafed artificial seagrass. The response to habitat, as measured by rate of encounter with amphipods, probability of attack after encounter, probability of success after attack, and overall rate of amphipod consumption, was determined for combinations of two fish size classes and three amphipod size classes. Small fish did not experience visually inhibitive effects in either habitat, while large fish had their visual fields impinged upon in the …

The Respiratory Response Of Busycon Canaliculatum (L) To Seasonal Variation Of Water Temperature, Salinity, And Oxygen, Harry Gregory Polites

Dissertations, Theses, and Masters Projects

No abstract provided.

Renormalization Group Theory Technique And Subgrid Scale Closure For Fluid And Plasma Turbulence, Ye Zhou

Dissertations, Theses, and Masters Projects

Renormalization group theory is applied to incompressible three-dimension Navier-Stokes turbulence so as to eliminate unresolvable small scales. The renormalized Navier-Stokes equation includes a triple nonlinearity with the eddy viscosity exhibiting a mild cusp behavior, in qualitative agreement with the test-field model results of Kraichnan. For the cusp behavior to arise, not only is the triple nonlinearity necessary but the effects of pressure must be incorporated in the triple term.;Renormalization group theory is also applied to a model Alfven wave turbulence equation. In particular, the effect of small unresolvable subgrid scales on the large scales is computed. It is found that …

Synthesis Of N, N'-Bis-(3-Deoxy-Beta-Cyclodextrin)-Ethyl Endiamine And Potential Photochemical Applications, Ronald Koy Hann

Dissertations, Theses, and Masters Projects

No abstract provided.

A Stereoselective Synthesis Of Cis-2,5-Disubstituted Pyrrolidines: Precursors For The (5e, 8z)-3,5-Dialkyl Pyrrolizidines, Mehul Shantilal Shah

Dissertations, Theses, and Masters Projects

No abstract provided.

Synthesis, Characterization, And Reactivity Of Some Novel Peroxo Heteroligand Complexes Of Vanadium(V) And Molybdenum(Vi), Bruce Conrad Puryear

Dissertations, Theses, and Masters Projects

No abstract provided.

Catastrophes And Stable Caustics In Bound States Of Hamiltonian Systems, John B. Delos

Arts & Sciences Articles

Caustics—envelopes of families of classical trajectories, or boundaries between classically allowed and forbidden regions—correspond to singular points of a phase‐space surface called a Lagrangian manifold. According to catastrophe theory, only a limited number of types of caustics are stable under general perturbations of the manifold. Most of the caustics that are found in calculations correspond to members of the canonical list of elementary catastrophes. However, there are some exceptions—examination of trajectories of typical Hamiltonian systems shows that stable structures exist which are not in accord with the stability theorem of catastrophe theory. These exceptional cases are discussed in this paper. …

Cabin Point Creek Channelization Study : Final Report, Walter I. Priest Iii, Robert J. Byrne, Bruce J. Neilsen, George R. Thomas

Reports

In the realm of environmental impact assessment and analysis the effects of a proposed project are most often referred to in the subjunctive sense because of the qualifications and probabilities related to these postulations. Seldom does the opportunity present itself to follow a project to fruitition and beyond to, in fact, determine the validity of the assumptions made in arriving at the potential impacts of a project. Even less often is it possible to monitor a project from prior to construction to several years after the project has been completed to ascertain the exact nature of the projects impacts, compare …

Field Measurements Of Tidal Currents, I664 Tunnel Axis, Hampton Roads, Virginia : A Report To Morrison-Knudsen/Interbeton, Physical Oceanography Division, Virginia Institute Of Marine Science

Reports

Currents in the region of Newport News Point of the James River were measured at the request of Morrison-Knudsen/Interbeton to examine maximum flood and ebb values during spring tides and determine first order relationships of current strengths and phase lags between this region and Chesapeake Bay Entrance predictions.

A Mark-Recapture Study Of Striped Bass In The James River, Virginia : Annual Report 1987, Joseph G. Loesch, William H. Kriete Jr., Bruce W. Hill

Reports

Internal anchor tags with external tubes were used to tag 1,986 striped bass in the James River in the Spring of 1987. The total number tagged was adjusted (at this time) to 823 because of observed and suspected tagging mortality. The available stock of striped bass in the Spring contained both young resident fish and mature nonresident fish which left the area of capture after spawning, presumably to migrate north in coastal waters. The exodus of the mature fish after spawning and the absence of a commercial fishery resulted in only 42 tag returns as of Spring 1988. This proportion …

Forested Buffer Zones : Pilot Studies On Efficiency In Reducing Surface And Shallow Groundwater Nutrient Inputs To Estuarine Waters, Carl Hershner

Reports

This study was designed as a pilot study with the intent of identifying important considerations for the design and conduct of an investigation of forested buffer strip performance in Virginia's coastal plain. The approach 3 4' I was to conduct a small preliminary study on a single site using the opportunity to investigate a number of potential sampling methods.

Sediment Oxygen Demand In Hunting Creek And The Potomac River, Carl F. Cerco

Reports

Sediment oxygen demand measures were conducted in Hunting Creek during the period June 17 to August 19, 1986.

Plume Monitoring Of Rappahannock And York Spit Channels, Baltimore Harbor And Channels: Phase 1, M. Nichols, R. J. Diaz, Et Al

Reports

A major element and concern necessary for evaluating the environmental impact of dredging operations is the dispersion of finegrained dredged material. The turbid plume generated by draghead agitation and by overflow processes from a hopper dredge can dictate the degree of potential adverse effects. Under certain environmental and aesthetic circumstances control of the plume may be advisable. Although turbid plumes produced by open water disposal operations have been evaluated in many investigations (e.g. Barnard. 1978). detailed field assessments of plumes produced by hopper dredging operations are scarce.

Distribution Of Submerged Aquatic Vegetation In The Chesapeake Bay And Tributaries And Chincoteague Bay - 1986, Robert Orth, Jim Simons, Judith Capelli, Virginia Carter, Adam A. Frisch, Larry Hindman, Stephen Hodges, Kenneth A. Moore, Nancy Rybicki

Reports

No abstract provided.

Monogenetic Trematodes From The Southern Pacific Ocean Polyopisthocotyleids From The Australian Fishes, The Subfamily Polylabrinae And Microcotylinae, W. A. Dillon, William J. Hargis Jr., Antonio E. Harrises

Reports

This eighth of a series of monogenetic trematodes from the Southern Pacific Ocean discusses two species of Monogenea from Australian waters. Polylabroides mylionis n. sp., from the gills of Mylio butcheri, is described. Neobivagina agonostomi (Sandars, 1945} Dillon and Hargis, 1965, from the gills of Aldrichett~ forsteri, is redescribed; a new locality record is reported for Neobivagina agonostomi.

Wetlands Board Bulletin Vol. I, No. 4, Virginia Institute Of Marine Science

Virginia Wetlands Reports

• Wetlands and Coastal Primary Sand Dune Violation Procedures
• Planting Wetlands and Dunes in Virginia, Part 2: On-Site Monitoring. James E. Perry, III and Walter I. Priest, III
• In the News: Erosion policy lacking, panel says Riprap for Shoreline Erosion Control. Lee Hill