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Articles 1 - 20 of 20
Full-Text Articles in Physical Sciences and Mathematics
Participation Of Environmental Coalitions In The Development Of Public Policy, Wayne Richard Knight
Participation Of Environmental Coalitions In The Development Of Public Policy, Wayne Richard Knight
Dissertations, Theses, and Masters Projects
No abstract provided.
A [Mu]+Srstudy Of Uniaxial Stress Induced Symmetry Breaking In An Fe Single Crystal, Min. Namkung
A [Mu]+Srstudy Of Uniaxial Stress Induced Symmetry Breaking In An Fe Single Crystal, Min. Namkung
Dissertations, Theses, and Masters Projects
For the first time, external uniaxial stress has been used in a (mu)('+)SR experiment. The stress dependences of the following parameters were obtained for Fe crystals: the muon precessional frequency, (nu)(,(mu)), the transverse (longitudinal) depolarization rates, 1/T(,2) (1/T(,1)), and F(,T)/F(,L), the ratio of the probabilities for the muon to find domains with transverse/longitudinal fields. The shift in (nu)(,(mu)) was -0.34 (+OR-) 0.023 MHz per 100 micro-strain along the -axis. Changes in other parameters depend on the sample history but they, in general, increase with stress.;External stress changes the muon occupational probability at each site which significantly affects the dipolar field …
Anisotrophy In Mhd Turbulence Due To A Mean Magnetic Field, John V. Shebalin
Anisotrophy In Mhd Turbulence Due To A Mean Magnetic Field, John V. Shebalin
Dissertations, Theses, and Masters Projects
The development of anisotropy in an initially isotropic spectrum is studied numerically for two-dimensional magnetohydrodynamic (MHD) turbulence. The anisotropy develops due to the combined effects of an externally imposed dc magnetic field and viscous and resistive dissipation at high wave numbers. The effect is most pronounced at high mechanical and magnetic Reynolds numbers. The anisotropy is greater at the higher wave numbers.;The statistical structure of two-dimensional MHD turbulence is also considered. It is shown that the three known rugged invariants of the isotropic case reduce to two for the anisotropic case. Randomness and ergodicity are also briefly discussed.
The Distribution And Ecology Of Gammaridean Amphipods In The Plankton Of The Middle Atlantic Bight, Cathy J. Womack
The Distribution And Ecology Of Gammaridean Amphipods In The Plankton Of The Middle Atlantic Bight, Cathy J. Womack
Dissertations, Theses, and Masters Projects
No abstract provided.
Organic Compound Levels In A Sediment Core From The Elizabeth River Of Virginia, Muzhen Lu
Organic Compound Levels In A Sediment Core From The Elizabeth River Of Virginia, Muzhen Lu
Dissertations, Theses, and Masters Projects
No abstract provided.
An Investigation Of Sand Transport Phenomena In The Rappahannock River Estuary, Virginia, Charles Joseph Natale
An Investigation Of Sand Transport Phenomena In The Rappahannock River Estuary, Virginia, Charles Joseph Natale
Dissertations, Theses, and Masters Projects
Quantitative evidence supplied by bottom sediment textural analysis, Fourier grain-shape analysis and Q-mode factor analysis indicate that river-borne sand-sized sediment originating in the upper reaches of the Rappahannock is actively transported downstream and ultimately delivered to the estuarine sediment regime. Current velocity observations in the upper estuary as well as suspended sediment concentrations measured at stream gaging stations, indicate that short-term extreme hydrological events such as periodic river flooding provide a plausible transport mechanism to move river-borne sands into the estuarine sediment regime.Events of this nature can disrupt average partly-mixed estuarine circulation patterns by displacing the salt-wedge to a more …
Zooplankton Communities In Chesapeake Bay Seagrass Systems, Cathy Elizabeth Meyer
Zooplankton Communities In Chesapeake Bay Seagrass Systems, Cathy Elizabeth Meyer
Dissertations, Theses, and Masters Projects
No abstract provided.
Waterfowl Utilization Of A Submerged Vegetation (Zostera Marina And Ruppia Maritima) Bed In The Lower Chesapeake Bay, Elizabeth W. Wilkins
Waterfowl Utilization Of A Submerged Vegetation (Zostera Marina And Ruppia Maritima) Bed In The Lower Chesapeake Bay, Elizabeth W. Wilkins
Dissertations, Theses, and Masters Projects
No abstract provided.
Life History And Management Of Spiny Dogfish, Squalus Acanthias, Off The Northeastern United States, Marta Nammack
Life History And Management Of Spiny Dogfish, Squalus Acanthias, Off The Northeastern United States, Marta Nammack
Dissertations, Theses, and Masters Projects
No abstract provided.
Analysis Of Population And Price Aspects Of The Virginia Hard Clam (Mercenaria Mercenaria) Fishery, Andre C. Kvaternik
Analysis Of Population And Price Aspects Of The Virginia Hard Clam (Mercenaria Mercenaria) Fishery, Andre C. Kvaternik
Dissertations, Theses, and Masters Projects
No abstract provided.
Utilization Of A Zostera Marina And Ruppia Maritima Habitat By Four Decapods With Emphasis On Callinectes Sapidus, Deborah L. Penry
Utilization Of A Zostera Marina And Ruppia Maritima Habitat By Four Decapods With Emphasis On Callinectes Sapidus, Deborah L. Penry
Dissertations, Theses, and Masters Projects
No abstract provided.
Diffusion And Trapping Of Positive Muons In Niobium And In Aluminum Alloys, Muhammad Zillulhaq Numan
Diffusion And Trapping Of Positive Muons In Niobium And In Aluminum Alloys, Muhammad Zillulhaq Numan
Dissertations, Theses, and Masters Projects
Zero, longitudinal and transverse magnetic field uSR has been used to investigate (mu)('+) diffusion and trapping in Nb. The ambiguity in the interpretation of the 'double humped' temperature dependence of the depolarisation rate for the transverse field case has been resolved. A discussion of how the zero and longitudinal measurements can distinguish between the trapping and detrapping phenomena is presented with (mu)SR data analysis in mind. Muon mobility is shown to increase monotonically with temperature. The width of the local magnetic field distribution due to Nb nuclear moments and the rate for trapping and detrapping of muons have been measured …
A Precision Measurement Of The Lifetime Of The Positive Muon, Kevin Louis Giovanetti
A Precision Measurement Of The Lifetime Of The Positive Muon, Kevin Louis Giovanetti
Dissertations, Theses, and Masters Projects
In an experiment performed at TRIUMF Laboratory, the time distribution of muon decay positrons arising from pions stopped in a water Cherenkov counter was measured with a high precision timing system. The pions served as a source of positive muons.;The data were used to determine a new value for the positive muon lifetime. This lifetime 2.19695 (+OR-) .00006 (sec) is slightly lower than previous measurements but still in fair agreement. The data were tested for the various systematic effects that typically occur in these measurements.
Experimental Studies Of Antiprotonic Atoms In Hydrogen And Helium, Jeffrey Robert Lindenmuth
Experimental Studies Of Antiprotonic Atoms In Hydrogen And Helium, Jeffrey Robert Lindenmuth
Dissertations, Theses, and Masters Projects
In an experiment performed at Brookhaven National Laboratory the spectra of atomic x rays from stopped antiprotons in gaseous helium, liquid hydrogen, and gaseous hydrogen were measured. The measurements were performed at 1 atmosphere and 25(DEGREES)K for the gaseous target.;In the case of He the L and M series of p were observed and relative intensities measured. However in hydrogen no x rays were observed and thus only an upper limit of the yields of the K series in liquid and gaseous hydrogen were calculated.
Two-Dimensional, Intratidal Model Study Of Salinity Intrusion Structure And Motion In Partially-Mixed Estuaries (Virginia), Carl F. Cerco
Two-Dimensional, Intratidal Model Study Of Salinity Intrusion Structure And Motion In Partially-Mixed Estuaries (Virginia), Carl F. Cerco
Dissertations, Theses, and Masters Projects
A two-dimensional, longitudinal-vertical model for partially-mixed estuaries has been developed. The model provides intratidal predictions of surface level, velocity, and salinity through a semi-implicit finite-difference solution to the continuity and momentum equations and an explicit finite-difference solution to the salinity equation. The model was verified through comparison with analytical solutions, laboratory data, and prototype data. Following verification, the model was used to simulate the destratification-stratification cycle which occurs in the James River Estuary, Virginia, coincident with the spring-neap tidal cycle. In a second application to the James, a simulation of the movement of the salinity intrusion following a storm-generated freshwater …
A Study Of Nutritional Requirements Of The Larvae Of The American Oyster (Crassostrea Virginica), Fu-Lin E. Chu
A Study Of Nutritional Requirements Of The Larvae Of The American Oyster (Crassostrea Virginica), Fu-Lin E. Chu
Dissertations, Theses, and Masters Projects
The purpose of this study is to obtain information for the formulation of artificial diets for larvae of the American oyster (Crassostrea virginica) and to test procedures related to presenting these diets to the oyster larvae. In order to determine the nutrient components usually provided in larval diets, biochemical analyses of lipids and fatty acids, proteins and amino acids and polysaccharide carbohydrates were performed on five algae species used as a food source for oyster larvae. These algae are Chlorella sp., Pyramimonas virginica, Pseudoisochrysis paradoxa, Pavlova (Monochrysis) lutheri and Isochrysis galbana. The biochemical analyses indicate that the nutritional value of …
Influence Of Temperature On The Immune Response Of Juvenile Summer Flounder, Paralichthys Dentatus, And Its Role In The Elimination Of Trypanoplasma Bullocki Infections, Joseph P. Sypek
Dissertations, Theses, and Masters Projects
Two groups of juvenile summer flounder maintained at 5�C were experimentally infected with the hemoflagellate Trypanoplasma bullocki. Another group maintained at 5�C was not infected. The water temperature of one infected group was raised stepwise to 12�C, 18�C, and 24�C for 2 to 3 weeks at each level. The other infected group was maintained at 5�C for 12 weeks, the duration of the experiment. In addition, juvenile flounder were collected over a temperature range of 6�C to 22�C from February to June, 1982 to monitor natural infections. Live T. bullocki were incubated in plasma from fish at each temperature to …
Effects Of Disruptive Grazing By The Mud Snail Ilyanassa Obsoleta On Mudflat Nematode Populations, David Ludwig
Effects Of Disruptive Grazing By The Mud Snail Ilyanassa Obsoleta On Mudflat Nematode Populations, David Ludwig
Dissertations, Theses, and Masters Projects
Population densities of the mud snail Ilyanassa obsoleta were manipulated in caging experiments on a salt marsh mudflat and in laboratory microcosms. Mud snails outcompete nematodes for food resources, but may increase resources available to deposit feeding groups. Mud snails reduce annelid (polychaete and oligochaete) populations by substrate disruption. Reduced annelid densities provide the nematode community with some release from predation and competition. In mudflat sediments, the nematode community responds to both primary (predation) and secondary (envirorm1ental release, food competition) interactions. Multiple levels of interactive coupling should be considered in any systems level investigation in this habitat.
Wave Refraction By Warm Core Rings, George R. Mapp
Wave Refraction By Warm Core Rings, George R. Mapp
Dissertations, Theses, and Masters Projects
No abstract provided.
The Distribution Of Dissolved Silica And Particulate Biogenic Silica In The James, York And Rappahannock Estuaries, Virginia, Gary F. Anderson
The Distribution Of Dissolved Silica And Particulate Biogenic Silica In The James, York And Rappahannock Estuaries, Virginia, Gary F. Anderson
Dissertations, Theses, and Masters Projects
No abstract provided.