Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Oceanography and Atmospheric Sciences and Meteorology (746)
- Oceanography (692)
- Life Sciences (588)
- Fresh Water Studies (364)
- Physics (361)
-
- Marine Biology (333)
- Environmental Sciences (271)
- Chemistry (259)
- Computer Sciences (224)
- Earth Sciences (146)
- Engineering (133)
- Animal Sciences (125)
- Ecology and Evolutionary Biology (114)
- Condensed Matter Physics (98)
- Zoology (93)
- Organic Chemistry (86)
- Natural Resources and Conservation (68)
- Social and Behavioral Sciences (65)
- Polymer Chemistry (63)
- Biodiversity (51)
- Geology (51)
- Atomic, Molecular and Optical Physics (49)
- Natural Resources Management and Policy (47)
- Materials Science and Engineering (39)
- Mathematics (37)
- Analytical Chemistry (36)
- Biochemistry, Biophysics, and Structural Biology (36)
- Plasma and Beam Physics (36)
- Physical Chemistry (34)
- Keyword
-
- Catadioptric imaging (1)
- Control (1)
- Criminal Network (1)
- GIS (1)
- Infectious Disease (1)
-
- Infrared surveillance (1)
- Integer Programming (1)
- Lamb waves (1)
- Locating-Dominating (1)
- Machine learning (1)
- Marsh (1)
- Mathematical Modeling (1)
- Modeling (1)
- Multiscale Models (1)
- Network Location (1)
- Optimization (1)
- Oyster reef (1)
- Pattern formation (1)
- Spatial analysis (1)
- Ultrasonic communication (1)
- Publication Year
Articles 1231 - 1260 of 1876
Full-Text Articles in Physical Sciences and Mathematics
Market Interactions And Competition Between Public And Private Oyster Production And Supplies From Other States, Ya-Ke Hsu
Dissertations, Theses, and Masters Projects
Oyster production in Virginia has declined dramatically in the past ten years, causing Virginia oyster processors to rely increasingly on oyster supplies from other regions. In response to the industry problems, the Virginia Marine Resources Commission (VMRC) developed and began implementing an Oyster Fishery Management Plan (OFMP) in 1985. Primarily, the plan seeks to increase Virginia oyster production from both public and leased grounds. A large increase in production could significantly affect the oyster market. There is thus a need to understand the Virginia oyster market, which derives raw material supplies primarily from public and leased-grounds production and from other …
Movements And Behavior Of Wild And Head-Started Sea Turtles, John A. Keinath
Movements And Behavior Of Wild And Head-Started Sea Turtles, John A. Keinath
Dissertations, Theses, and Masters Projects
Flipper-tagging, aerial surveys, and satellite telemetry was used to investigate the occurrence, migratory routes, distances traveled, swimming speeds, diving behavior, and the relation of water temperature to movements and timing of migration of wild loggerhead (Caretta caretta) and Kemp's ridley (Lepidochelys kempii) sea turtles. The behavior and movements of head-started loggerhead turtles was investigated with satellite telemetry and compared to wild turtles. Flipper-tagged loggerhead and Kemp's ridley turtles inhabit Chesapeake Bay during the warm months and many return in subsequent seasons. Aerial surveys showed that loggerhead turtles migrate from south of Cape Hatteras to northern waters during May and June, …
A Model Study Of Hydrodynamic And Water Quality Characteristics Of The Rappahannock Estuary, Virginia, Kyeong Park
A Model Study Of Hydrodynamic And Water Quality Characteristics Of The Rappahannock Estuary, Virginia, Kyeong Park
Dissertations, Theses, and Masters Projects
A laterally integrated, two-dimensional, real-time model, consisting of linked hydrodynamic and water quality models, is developed and applied to the Rappahannock Estuary, Virginia. The hydrodynamic model, based on the principles of conservation of volume, momentum and mass, predicts surface elevation, current velocity and salinity. The water quality model, based on the conservation of mass alone, predicts eight parameters; dissolved oxygen (DO), chlorophyll 'a', carbonaceous biochemical oxygen demand (CBOD), organic nitrogen, ammonia nitrogen, nitrite-nitrate nitrogen, organic phosphorus and inorganic phosphorus. The model equations were solved using a two time level, finite difference scheme. The hydrodynamic model was calibrated and verified using …
Life History, Population Dynamics And Yield-Per-Recruit Modeling Of Atlantic Croaker, Micropogonias Undulatus, In The Chesapeake Bay Area, Luiz R. Barbieri
Life History, Population Dynamics And Yield-Per-Recruit Modeling Of Atlantic Croaker, Micropogonias Undulatus, In The Chesapeake Bay Area, Luiz R. Barbieri
Dissertations, Theses, and Masters Projects
Otoliths, scales, dorsal spines, and pectoral fin rays, of Atlantic croaker, Micropogonias undulatus, were compared for legibility of presumed annuli and precision in repeated readings, to determine the best structure for ageing. Marks on transverse otolith sections were easiest to read and showed the best agreement between readings. Fish collected in Chesapeake Bay and in Virginia and North Carolina coastal waters during 1988-1991 were then aged using otolith sections. Ages 1-8 were recorded, but eight-year-old fish were rare. Marginal increment analysis showed that for ages 1-7 annuli are formed once a year during the period April-May. Otolith age readings were …
Effects Of The Habitat And Size-Specific Predation On The Ontogenetic Shift In Habitat Use By Newly Settled Blue Crabs, Callinectes Sapidus, Adele J. Pile
Dissertations, Theses, and Masters Projects
No abstract provided.
Comparison Of Uptake And Disposition Of Organic Pollutants In Intermolt And Ecdysial Blue Crabs, Callinectes Sapidus, Judy Lynne Haner
Comparison Of Uptake And Disposition Of Organic Pollutants In Intermolt And Ecdysial Blue Crabs, Callinectes Sapidus, Judy Lynne Haner
Dissertations, Theses, and Masters Projects
No abstract provided.
Amorphometric And Meristic Study Of The Halfbeak, Hyporhamphus Unifasciatus (Teleostei: Hemiramphidae) From The Western Atlantic, With The Description Of A New Species, Heidi M. Banford
Dissertations, Theses, and Masters Projects
No abstract provided.
The Relationship Between Dominant Macrobenthos And Cyclical Hypoxia In The Lower York River, R. Joseph Neubauer
The Relationship Between Dominant Macrobenthos And Cyclical Hypoxia In The Lower York River, R. Joseph Neubauer
Dissertations, Theses, and Masters Projects
No abstract provided.
Dynamics Of Fish Assemblages Associated With An Offshore Artificial Reef In The Southern Mid-Atlantic Bight, Aaron J. Adams
Dynamics Of Fish Assemblages Associated With An Offshore Artificial Reef In The Southern Mid-Atlantic Bight, Aaron J. Adams
Dissertations, Theses, and Masters Projects
No abstract provided.
Molecular Diffusion Coefficients For Polycyclic Aromatic Hydrocarbons In Air And Water, Kurt E. Gustafson
Molecular Diffusion Coefficients For Polycyclic Aromatic Hydrocarbons In Air And Water, Kurt E. Gustafson
Dissertations, Theses, and Masters Projects
No abstract provided.
Distribution Of Organochlorine Pollutants In Sea Turtles, Mary J. Rybitski
Distribution Of Organochlorine Pollutants In Sea Turtles, Mary J. Rybitski
Dissertations, Theses, and Masters Projects
No abstract provided.
Interspecific And Intraspecific Variability In Placoid Scale Morphology In Relation To Body Form Variability In Squaliformes, Christopher R. Tabit
Interspecific And Intraspecific Variability In Placoid Scale Morphology In Relation To Body Form Variability In Squaliformes, Christopher R. Tabit
Dissertations, Theses, and Masters Projects
An ontogenetic series of nine species; Centrophorus granulosus, Centroscymnus coelolepis, Dalatias licha, Deania calcea, Echinorhinus cookei, Isistius brasiliensis, Oxynotus centrina and Squalus acanthias were studied to determine swimming capabilities, boundary-layer flow conditions and placoid scale functional morphologies. Body morphometric variables included the girth and the distance from snout to the orbitals, origin of the median and paired fins, and the caudal peduncle, body and fin surface area, fin aspect ratios and caudal fin angles. Placoid scales were sampled from sixteen regions across the body. Morphometric variables included the number of scales per area of integument, scale crown width, length and …
An Integration Of Case-Based And Model-Based Reasoning And Its Application To Physical System Faults, Stamos T. Karamouzis
An Integration Of Case-Based And Model-Based Reasoning And Its Application To Physical System Faults, Stamos T. Karamouzis
Dissertations, Theses, and Masters Projects
Case-Based Reasoning (CBR) systems solve new problems by finding stored instances of problems similar to the current one, and by adapting previous solutions to fit the current problem, taking into consideration any differences between the current and previous situations. CBR has been proposed as a more robust and plausible model of expert reasoning than the better-known rule-based systems.;Current CBR systems have been used in planning, engineering design, and memory organization. There has been minimal work, however, in the area of reasoning about physical systems. This type of reasoning is a difficult task, and every attempt to automate the process must …
Fourier Analysis Of Frequency Domain Discrete Event Simulation Experiments, Mousumi Mitra Hazra
Fourier Analysis Of Frequency Domain Discrete Event Simulation Experiments, Mousumi Mitra Hazra
Dissertations, Theses, and Masters Projects
Frequency Domain Experiments (FDEs) were first used in discrete-event simulation to perform system parameter sensitivity analysis for factor screening in stochastic system simulations. FDEs are based on the intuitive assertion that if one or more system parameters are oscillated at fixed frequencies throughout a simulation run, then oscillations at the same frequencies will be induced in the system's response. Spectral (Fourier) analysis of these induced oscillations is then used to characterize and analyze the system. Since their introduction 12 years ago, significant work has been done to extend the applicability of FDEs to regression analysis, simulation optimization and gradient estimation. …
The Effects Of Granularity On The Microwave Surface Impedance Of High Kappa Superconductors, Stephen Keith Remillard
The Effects Of Granularity On The Microwave Surface Impedance Of High Kappa Superconductors, Stephen Keith Remillard
Dissertations, Theses, and Masters Projects
The microwave surface impedance of granular high temperature superconductors is an important figure of merit for technological applications. Because the behavior of the granular materials deviates significantly from that of the ideal defect free superconductors, the loss mechanisms are not fully understood. This dissertation seeks to quantify the contribution of granularity to centimeter wave and millimeter wave losses. By understanding these losses, the superconductive coupling between neighboring grains can also be understood.;The weakly coupled grain model is used as a phenomenological description of the microwave surface impedance. The granular superconducting surface is modelled as an effective resistively shunted Josephson junction. …
The Oxidation Of Beta-Cyclodextrin Via The Photolysis Of 6-Beta-Cyclodextrin Benzoyl Formate, Heather Alison Creswick
The Oxidation Of Beta-Cyclodextrin Via The Photolysis Of 6-Beta-Cyclodextrin Benzoyl Formate, Heather Alison Creswick
Dissertations, Theses, and Masters Projects
No abstract provided.
The Synthesis Of N,N-Disubstituted Hydroxylamines Via Rearrangement Reactions Between Trialkylboranes And Nitrones, Stacie M. Cook
The Synthesis Of N,N-Disubstituted Hydroxylamines Via Rearrangement Reactions Between Trialkylboranes And Nitrones, Stacie M. Cook
Dissertations, Theses, and Masters Projects
No abstract provided.
Characterization Of Epoxy Resins For Use In The Resin Transfer Molding Process, Christina Kaye Short
Characterization Of Epoxy Resins For Use In The Resin Transfer Molding Process, Christina Kaye Short
Dissertations, Theses, and Masters Projects
No abstract provided.
Synthesis Of Boron-Substituted Isoxazolidines By Reaction Of Nitrones With Alkenyl Boronate Esters, Kevin P. Gwaltney
Synthesis Of Boron-Substituted Isoxazolidines By Reaction Of Nitrones With Alkenyl Boronate Esters, Kevin P. Gwaltney
Dissertations, Theses, and Masters Projects
No abstract provided.
Participation Of Alkenylboronate Esters In [2+2] Enone-Olefin Photocycloadditions, William Charles Lappenbusch
Participation Of Alkenylboronate Esters In [2+2] Enone-Olefin Photocycloadditions, William Charles Lappenbusch
Dissertations, Theses, and Masters Projects
No abstract provided.
The Synthesis Of Acetylisophthalic Acid For The Double Capping Of Beta-Cyclodextrin, Shuci Sharma
The Synthesis Of Acetylisophthalic Acid For The Double Capping Of Beta-Cyclodextrin, Shuci Sharma
Dissertations, Theses, and Masters Projects
No abstract provided.
Suspended Sediment Concentration Profiles In The Bottom Boundary Layer, Jingping Xu
Suspended Sediment Concentration Profiles In The Bottom Boundary Layer, Jingping Xu
Dissertations, Theses, and Masters Projects
Near-bottom suspended sediment concentrations and velocities were measured on the inner shelf off Duck, N.C. from late October to early November, 1991. This period embraced both fair and storm conditions. Four bottom roughness models are tested using field data together with a wave-current boundary layer model. Bottom roughness plays a significant role in calculations of sediment concentration profiles and current velocity profiles. The importance of each of the three parts in the roughness models (grain roughness, ripple roughness, and sediment motion roughness) vary depending on forcing conditions. A new bottom roughness model is established and tested. The calculated concentration and …
Code Generation Using A Backtracking Lr Parser, Laurie Anne Smith King
Code Generation Using A Backtracking Lr Parser, Laurie Anne Smith King
Dissertations, Theses, and Masters Projects
Although the parsing phase of the modern compiler has been automated in a machine independent fashion, the diversity of computer architectures inhibits automating the code generation phase. During code generation, some intermediate representation of a source program is transformed into actual machine instructions. The need for portable compilers has driven research towards the automatic generation of code generators.;This research investigates the use of a backtracking LR parser that treats code generation as a series of tree transformations.
Allozyme Analysis Of Billfish Population Structure, Lee W. Morgan
Allozyme Analysis Of Billfish Population Structure, Lee W. Morgan
Dissertations, Theses, and Masters Projects
No abstract provided.
Survival And Abundance Of Juvenile Caribbean Spiny Lobster: Effects Of Shelter Size And Geographic Location, Jonathon Daniel Mintz
Survival And Abundance Of Juvenile Caribbean Spiny Lobster: Effects Of Shelter Size And Geographic Location, Jonathon Daniel Mintz
Dissertations, Theses, and Masters Projects
No abstract provided.
Generic Identification And Patterns Of External Pigment In Larval Gobies (Pisces: Gobiidae) From The Belize Barrier Reef, Elizabeth D. Maddox
Generic Identification And Patterns Of External Pigment In Larval Gobies (Pisces: Gobiidae) From The Belize Barrier Reef, Elizabeth D. Maddox
Dissertations, Theses, and Masters Projects
No abstract provided.
Shoreline Habitat Selection By Bald Eagles (Haliaeetus Leucocephalus) In A Non-Breeding Eagle Concentration-Area On The James River, Virginia, Kennedy H. Clark
Shoreline Habitat Selection By Bald Eagles (Haliaeetus Leucocephalus) In A Non-Breeding Eagle Concentration-Area On The James River, Virginia, Kennedy H. Clark
Dissertations, Theses, and Masters Projects
No abstract provided.
Intelligent Processing Of Pmr-15, Sean Michael Hart
Intelligent Processing Of Pmr-15, Sean Michael Hart
Dissertations, Theses, and Masters Projects
No abstract provided.
Distribution, Abundance, And Behavior Of The Cownose Ray, Rhinoptera Bonasus (Mitchill 1815), In Lower Chesapeake Bay, Robert A. Blaylock
Distribution, Abundance, And Behavior Of The Cownose Ray, Rhinoptera Bonasus (Mitchill 1815), In Lower Chesapeake Bay, Robert A. Blaylock
Dissertations, Theses, and Masters Projects
Aspects of the ecology of the cownose ray, Rhinoptera bonasus, in the lower Chesapeake Bay and its tributaries were studied using aerial surveys, biotelemetry, and examination of stomach contents. The Chesapeake Bay was surveyed by airplane during 1986-1989, to examine the distribution of cownose rays and estimate their abundance using line transect methods. Cownose rays resided in Chesapeake Bay throughout the summer months, entering in early June and emigrating in late September. They were usually absent, or nearly so, by late October. Mean monthly abundance ranged from none present in May and November, to a September average of 9.3 &\cdot& …
A Comparison Of Grow-Out Methods For The Bay Scallop, Argopecten Irradians Irradians, At Two Sites In Virginia, Mark J. Brotman
A Comparison Of Grow-Out Methods For The Bay Scallop, Argopecten Irradians Irradians, At Two Sites In Virginia, Mark J. Brotman
Dissertations, Theses, and Masters Projects
No abstract provided.