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Articles 3781 - 3810 of 4602
Full-Text Articles in Physical Sciences and Mathematics
Hydrographic Data From The Wolftrap Section, 1982-1983, L. M. Huzzey, J. M. Brubaker
Hydrographic Data From The Wolftrap Section, 1982-1983, L. M. Huzzey, J. M. Brubaker
Reports
No abstract provided.
Chesapeake Bay Marine Environmental Assessment December 1985 - February 1986, Karen Kelly, Terry L. Bashore, Karen L. Mcdonald
Chesapeake Bay Marine Environmental Assessment December 1985 - February 1986, Karen Kelly, Terry L. Bashore, Karen L. Mcdonald
Reports
No abstract provided.
Status Of The Major Oyster Diseases In Virginia, Eugene M. Burreson
Status Of The Major Oyster Diseases In Virginia, Eugene M. Burreson
Reports
No abstract provided.
Wetlands Board Bulletin Vol. I, No. 3, Virginia Institute Of Marine Science
Wetlands Board Bulletin Vol. I, No. 3, Virginia Institute Of Marine Science
Virginia Wetlands Reports
- Planting Wetlands and Dunes in Virginia, Part 1: How to Critically Review Project Designs. James E. Perry, III
- In the News: State in U.S. Shoreline Program Spartina alterniflora (Saltmarsh, Smooth, or Saltwater Cordgrass)
Wetlands Board Bulletin Vol. I, No. 2, Virginia Institute Of Marine Science
Wetlands Board Bulletin Vol. I, No. 2, Virginia Institute Of Marine Science
Virginia Wetlands Reports
- Special Feature: Westmoreland County. Kirk Havens
- Marina Sitings From the Scientific Advisor’s Viewpoint. Carl Hershner
Electron Detachment In Negative-Ion Collisions. Iii. Model Calculations., T. S. Wang, John B. Delos
Electron Detachment In Negative-Ion Collisions. Iii. Model Calculations., T. S. Wang, John B. Delos
Arts & Sciences Articles
With the use of a previously developed close-coupling theory, and simple models for the energy gap and propagator that arise in that theory, calculations are made of the properties of the survival probability for the negative ions and of the energy spectrum of detached electrons. Special attention is given to interference effects that might be seen under favorable circumstances.
Bound State Semiclassical Wave Functions, Stephen Knudson, John B. Delos, D. W. Noid
Bound State Semiclassical Wave Functions, Stephen Knudson, John B. Delos, D. W. Noid
Arts & Sciences Articles
The semiclassical theory developed by Maslov and Fedoriuk is used to calculate the wave function for a two‐dimensional bound state system. We investigate in detail an eigenstate of a coupled anharmonic oscillator system. The primitive semiclassical wave function is obtained from the characteristic function S and the density function J. Each of these functions consists of four branches corresponding to the four possible directions of motion of the classical trajectory through any point. The interference from the four branches determines the basic structure of the wave function. A uniform approximation gives a wave function which is well behaved along …
Probability Conservation In Theories Of Collisional Ionization And Detachment, M. L. Du, John B. Delos
Probability Conservation In Theories Of Collisional Ionization And Detachment, M. L. Du, John B. Delos
Arts & Sciences Articles
The semiclassical local-complex-potential theory has been widely used to describe detachment and ionization in atom-atom and ion-atom collisions. However, it has been shown that the resulting formulas do not conserve probability. In this paper, we show that the problem arises from the inconsistent treatment of the effects of interference, tunneling, and diffraction. A more complete theory is based upon the close-coupling expansion, which leads to an infinite set of coupled equations. A method for solving such sets of equations was developed in earlier work. Here we implement that method using a new iterative numerical scheme, and we show that the …
Wetlands Board Bulletin Vol. I, No. 1, Virginia Institute Of Marine Science
Wetlands Board Bulletin Vol. I, No. 1, Virginia Institute Of Marine Science
Virginia Wetlands Reports
- Analysis of Virginia’s Local Wetlands Boards. Carl Hershner, Tom Barnard, N. Bartlett Theberge
- Special Feature: Middlesex County. Kirk Havens
Sandy Estuarine Fill Transported Into The Mouth Of Chesapeake Bay, C. H. Hobbs Iii, S. M. Cohen, C. R. Berquist
Sandy Estuarine Fill Transported Into The Mouth Of Chesapeake Bay, C. H. Hobbs Iii, S. M. Cohen, C. R. Berquist
VIMS Books and Book Chapters
The landward flux of sand into an estuary is a process that is seldom documented or quantified, yet is important to the sedimentary dynamics of a maturing estuary. Data from three recent studies converge to demonstrate the transport of sand into Chesapeake Bay from the adjacent shelf. A 100- year sediment budget, distributions of heavy minerals, and seismic-reflection data all point to the bay mouth as a gate through which a significant quantity of sand enters the estuarine system.
Man's Physical Effects On The Elizabeth River, Maynard M. Nichols, Mary M. Howard-Strobel
Man's Physical Effects On The Elizabeth River, Maynard M. Nichols, Mary M. Howard-Strobel
VIMS Books and Book Chapters
Man's ever increasing activities in the Elizabeth River, i.e. dredging, disposal of dredged material and waterfront development, have drastically altered the river floor, reshaped the shoreline and changed the circulation. Long-continued dredging of shipping channels, which is fostered by coal export, larger ships, and military needs, has moved 220 million cu yds of sediment since 1870. As a result channel depth has increased 1.8 fold, and maintenance dredging rates have doubled about every 35 years. Open water disposal released 40 million cu yds into Hampton Roads and lower Chesapeake Bay. Landfill buried tributary creeks, moved the waterfront into the river …
Trace Element Contamination From Fly Ash Sites Near Chisholm Creek, Va, George C. Grant, Bruce J. Neilson, Gene M. Silberhorn
Trace Element Contamination From Fly Ash Sites Near Chisholm Creek, Va, George C. Grant, Bruce J. Neilson, Gene M. Silberhorn
VIMS Books and Book Chapters
The safe disposal of fly ash from power plants remains a concern because of dwindling available disposal sites and potential or actual environmental consequences. During the period from 1957 to 1974, the Virginia Electric and Power Co. station at Yorktown used a mixture of coal and refinery coke for power generation. The fly ash and bottom ash byproducts were disposed of in borrow pits which drain into Chisman Creek, a small estuary near the York River. In 1980 a domestic well near the pits turned green and tests revealed high concentrations of V and Se in some wells. Subsequently, contaminated …
Consequences Of Sediment Flux: Escape Or Entrapment?, Maynard M. Nichols
Consequences Of Sediment Flux: Escape Or Entrapment?, Maynard M. Nichols
VIMS Articles
Estuaries exhibit a full range of flux that extends from escape of sediment into the ocean to complete entrapment and storage within the system. The trapping efficiency of U.S. East Coast estuaries is compared with respect to long-term infilling and present- day flushing velocity , volumetric capacity , and circulatory mixing. It was found that entrapment prevails in many northern estuaries as a consequence of high volumetric capacity , low flushing velocity , and the nearly closed circulation. In many estuaries, channel deepening has reversed the " normal" trend of long-term infilling. Although dredging enhances circulatory entrapment, large-scale ocean dumping …
Air Chemistry Over The Tropical Forest Of Guyana, Gl Gregory, Rc Harriss, Rw Talbot, Ra Rasmussen, M Garstang, Mo Andrae, Rr Hinton, Et Al
Air Chemistry Over The Tropical Forest Of Guyana, Gl Gregory, Rc Harriss, Rw Talbot, Ra Rasmussen, M Garstang, Mo Andrae, Rr Hinton, Et Al
VIMS Articles
No abstract provided.
Storage Efficiency Of Estuaries, Maynard M. Nichols
Storage Efficiency Of Estuaries, Maynard M. Nichols
VIMS Books and Book Chapters
Estuaries or the U.S. Atlantic coast exhibit a range or storage efficiencies from complete storage to partial by-passing through the system. Efficiency, I.e. the ratio or sediment accumulation to river Input rate, ranges 0.7 in the Altamaha River, Ga. to 7.6 In the Choptank River, Md. Northern estuaries trap and store the bulk or their river input In addition to large amounts or sediment supplied from other sources. Southern estuaries accumulate major sediment loads in marshes and allow partial escape through channels to the sea.
The storage efficiency or difrerent estuaries is compared with respect to key factors that can …
Assessment Of Economic Heavy Minerals Of The Virginia Inner Continental Shelf, C. R. Berquist, C. Hobbs
Assessment Of Economic Heavy Minerals Of The Virginia Inner Continental Shelf, C. R. Berquist, C. Hobbs
Reports
The Virginia Division of Mineral Resources and the Virginia Institute of Marine Science jointly made three cruises over the Virginia continental shelf in April and July of 1985 to sample known heavy-mineral sites for minerals of potential economic and/or strategic value. In addition to sampling, side-scan sonar and sub-bottom profiling surveys were performed at a site off Smith Island. At the Smith Island site, as many as four acoustic horizons were detected within the upper 6 meters of sediment. The uppermost seismostratigraphic layer consists of fine and very fine sand and contains the higher concentrations of heavy minerals. There are …
The York River: A Brief Review Of Its Physical, Chemical And Biological Characteristics, Michael E. Bender
The York River: A Brief Review Of Its Physical, Chemical And Biological Characteristics, Michael E. Bender
Reports
The purpose of this paper is to provide an overview of the physical, chemical and biological characteristics of the York River, Virginia. The river is formed by the confluence of the Mattaponi and Pamunkey rivers at West Point, Virginia. It is tidal over its entire length and flows to the western shore of Chesapeake Bay.
Impacts Of Alum Sludge On Tidal Freshwater Streams, Morris H. Roberts, Robert J. Diaz
Impacts Of Alum Sludge On Tidal Freshwater Streams, Morris H. Roberts, Robert J. Diaz
VIMS Books and Book Chapters
Alum sludge, generated in the processing of surface water .for drinking water supplies, has traditionally been discharged into nearby streams in Virginia and elsewhere. Alum sludge contains aluminum in an insoluble and non-toxic form. There remains concern, however, that alum sludge may have a negative impact on receiving waters.
Dredging And Disposal In The Chesapeake Bay, Robert J. Diaz, Robert J. Byrne, Linda C. Schaffner
Dredging And Disposal In The Chesapeake Bay, Robert J. Diaz, Robert J. Byrne, Linda C. Schaffner
VIMS Books and Book Chapters
The management questions involved in dredging and open water dredged material disposal revolve around three basic issues: 1) stability of the dredged material within the defined disposal area, 2) altered resource value of bottoms affected by dredged material, and 3) mobilization of toxins from contaminated dredged material. These issues encompass all aspects of the physical and biological character of a project site. The actual evaluation of dredging and dredged material disposal has generally concentrated on acute impacts to bottom dwelling organisms, benthos, and or to water column characteristics. This emphasis has resulted in ample evidence that many disposal practices have …
The Use Of Crab Meal As A Supplemental Food For Juvenile Hard Clams (Mercenaria Mercenaria), Patricia Lynn Duncan
The Use Of Crab Meal As A Supplemental Food For Juvenile Hard Clams (Mercenaria Mercenaria), Patricia Lynn Duncan
Dissertations, Theses, and Masters Projects
No abstract provided.
A Nuclear Magnetic Resonance Study Of Deuterated Poly(Vinylidene Fluoride) And A Copolymer Of Deuterated Vinylidene Fluoride And Tetrafluoroethylene, Montee A. Doverspike
A Nuclear Magnetic Resonance Study Of Deuterated Poly(Vinylidene Fluoride) And A Copolymer Of Deuterated Vinylidene Fluoride And Tetrafluoroethylene, Montee A. Doverspike
Dissertations, Theses, and Masters Projects
Pulsed deuterium NMR experiments have been performed on deuterated samples of poly(vinylidene fluoride), PVF(,2), repeat unit CH(,2)CF(,2) and the copolymer poly(vinylidene fluoride)-tetrafluoroethylene (80-20), (PVF(,2)-F(,4)E). A deuterium line shape study has been employed to characterize the orientational distribution of the dipole moments in both poled and unpoled samples. In addition, the orientational distributions of chain axis alignment has been measured in stretched samples.;PVF(,2) and PVF(,2)-F(,4)E exhibit unique piezoelectric and pyroelectric properties which are due to their crystalline components (approximately 50% in typical material). Four crystalline phases exist in the homopolymer PVF(,2), the (alpha), (beta), (gamma), and the (delta). The relatively electrically …
Rydberg Atoms In Parallel Electric And Magnetic Fields, Robert Leonard Waterland
Rydberg Atoms In Parallel Electric And Magnetic Fields, Robert Leonard Waterland
Dissertations, Theses, and Masters Projects
I have calculated the energy spectrum of a highly excited atom which lies in parallel, static electric and magnetic fields. In parallel fields the Coulomb quantum numbers n and m are still "good" quantum numbers but 1 is not: the calculation is for n = 30, m = 1 atoms.;The eigenvalues were obtained by semi-classical quantisation of first-order classical perturbation theory and have been calculated for a large range of electric and magnetic field strengths. The results are in good agreement with those found from first-order degenerate quantum perturbation theory.;The semi-classical analysis provides a correlation diagram connecting the Stark effect …
Morphometric And Meristic Stock Identification Of Summer Flounder (Paralichthys Dentatus), Glenn Roger Delaney
Morphometric And Meristic Stock Identification Of Summer Flounder (Paralichthys Dentatus), Glenn Roger Delaney
Dissertations, Theses, and Masters Projects
No abstract provided.
Biological Review And Commercial Whelk Fisheries Analysis Of Busycon Carica With Comments On B Canaliculatum And B Contrarium In Virginia, Jane Dicosimo
Dissertations, Theses, and Masters Projects
No abstract provided.
Fluctuations In The Catchability Coefficient Of Atlantic Menhaden, 1968-1982, Steven M. Atran
Fluctuations In The Catchability Coefficient Of Atlantic Menhaden, 1968-1982, Steven M. Atran
Dissertations, Theses, and Masters Projects
No abstract provided.
The Synthesis Of Hindered Aliphatic Ketones For The Future Production Of Spiro [4.5] Decane Sesquiterpenes, Stephen Lee Hodges
The Synthesis Of Hindered Aliphatic Ketones For The Future Production Of Spiro [4.5] Decane Sesquiterpenes, Stephen Lee Hodges
Dissertations, Theses, and Masters Projects
No abstract provided.
Peroxo Complexes Of Vanadium(V) And Molybdenum(Vi) With Nicotine And Aspartic Acids, Sandra Jean Sheffield
Peroxo Complexes Of Vanadium(V) And Molybdenum(Vi) With Nicotine And Aspartic Acids, Sandra Jean Sheffield
Dissertations, Theses, and Masters Projects
No abstract provided.
The Stereospecific Synthesis Of Tetrahydropyrans And Tetrahydrofurans, Rhonda Carol Winstead
The Stereospecific Synthesis Of Tetrahydropyrans And Tetrahydrofurans, Rhonda Carol Winstead
Dissertations, Theses, and Masters Projects
No abstract provided.
The Cure Reaction Of An Aromatic Thermosetting Polyimide, Michael Edward Whitham
The Cure Reaction Of An Aromatic Thermosetting Polyimide, Michael Edward Whitham
Dissertations, Theses, and Masters Projects
No abstract provided.
Reproductive Ecology, Population Dynamics And Seasonal Movements Of The Hogchoker (Trinectes Maculatus), In The Elizabeth River, Virginia, Stephen M. Smith
Reproductive Ecology, Population Dynamics And Seasonal Movements Of The Hogchoker (Trinectes Maculatus), In The Elizabeth River, Virginia, Stephen M. Smith
Dissertations, Theses, and Masters Projects
No abstract provided.