Physical Sciences and Mathematics Commons^™

The Wind Effects On The Evaluation Of Proposed Craney Island Expansions In The Lower James And Elizabeth Rivers, Momo Chen

Dissertations, Theses, and Masters Projects

No abstract provided.

Investigations Into The Etiology Of Ulcerative Lesions In Atlantic Menhaden, Brevoortia Tyrannus, Raemarie Ann Johnson

Dissertations, Theses, and Masters Projects

No abstract provided.

Socioeconomic Effects Of Area Management And The Potential For Community-Based Co-Management: A Case Study Of The Atlantic Sea Scallop Fishery, Winifred L. Ryan

Dissertations, Theses, and Masters Projects

Community concerns regarding natural resource management may be addressed in several forms. The community may participate as part of the public in the management process; community concerns may be included in social impact assessment; and communities may directly participate as managers of resources whether on their own or in conjunction with higher levels of government. In fisheries, typically community concerns are addressed through social impact assessment which is perceived to be lacking in social theory, history, and often effect (Boggs 1994, Little and Krannich 1989). More recent activity and newer regulations show success with co-management, a management regime of shared …

Polycyclic Aromatic Hydrocarbon Sources And Distribution In An Urban Estuary, Shelby E. Walker

Dissertations, Theses, and Masters Projects

As part of the assessment of the potential risk posed by contaminated sediments to the environment and human health, the United States Environmental Protection Agency (USEPA) is developing a set of sediment quality criteria (SQC) that are based on equilibrium partitioning (EqP). While EqP theory has often been used to predict contaminant concentrations within a factor of two for a range of sediment types, substantial deviations from predicted values have also been documented. The objective of this research was to evaluate the influence of PAH source on PAH sediment-pore water partitioning and distribution in sediments. The Elizabeth River is one …

Multinuclear Nmr Studies Of Relaxor Ferroelectrics, Donghua Zhou

Dissertations, Theses, and Masters Projects

Multinuclear NMR of 93Nb, 45Sc, and 207Pb has been carried out to study the structure, disorder, and dynamics of a series of important solid solutions: perovskite relaxor ferroelectric materials (1-x) Pb(Mg1/3Nb 2/3)O3-x Pb(Sc1/2Nb1/2)O 3 (PMN-PSN).;93Nb NMR investigations of the local structure and cation order/disorder are presented as a function of PSN concentration, x. The superb fidelity and accuracy of 3QMAS allows us to make clear and consistent assignments of spectral intensities to the 28 possible nearest B-site neighbor (nBn) configurations, (NMg, NSc, NNb), where each number ranges from 0 to 6 and their sum is 6. For most of the …

Magnetohydrodynamic Turbulence: The Development Of Lattice Boltzmann Methods For Dissipative Systems, Angus Ian Duncan Macnab

Dissertations, Theses, and Masters Projects

Computer simulations of complex phenomena have become an invaluable tool for scientists in all disciplines. These simulations serve as a tool both for theorists attempting to test the validity of new theories and for experimentalists wishing to obtain a framework for the design of new experiments. Lattice Boltzmann Methods (LBM) provide a kinetic simulation technique for solving systems governed by non-linear conservation equations. Direct LBMs use the linearized single time relaxation form of the Boltzmann equation to temporally evolve particle distribution functions on a discrete spatial lattice. We will begin with a development of LBMs from basic kinetic theory and …

Time-Resolved Optical Studies Of Colossal Magnetoresistance And Charge -Density Wave Materials, Yuhang Ren

Dissertations, Theses, and Masters Projects

This thesis presents measurements of collective modes and ultrafast carrier relaxation dynamics in charge-density-wave (CDW) conductors and colossal magnetoresistance (CMR) manganites. A femtosecond laser pump pulse excites a broad frequency spectrum of low-energy collective modes and electron-hole pairs thereby changing its optical properties. The low-energy collective excitations and quasiparticle relaxation and recombination processes are monitored by measuring the resulting photoinduced absorption as a function of probe pulse wavelength and time delay.;A general model was developed for the photogeneration and detection mechanism of collective modes based on light absorption in two-color pump-probe experiments. A broad spectrum of collective modes (phasons and …

Power Considerations For Memory-Related Microarchitecture Designs, Zhichun Zhu

Dissertations, Theses, and Masters Projects

The fast performance improvement of computer systems in the last decade comes with the consistent increase on power consumption. In recent years, power dissipation is becoming a design constraint even for high-performance systems. Higher power dissipation means higher packaging and cooling cost, and lower reliability. This Ph.D. dissertation will investigate several memory-related design and optimization issues of general-purpose computer microarchitectures, aiming at reducing the power consumption without sacrificing the performance. The memory system consumes a large percentage of the system's power. In addition, its behavior affects the processor power consumption significantly. In this dissertation, we propose two schemes to address …

Transport Analysis In Polymeric Liquids And Films: Investigations In Ionic Mobility Isolation Techniques And Permeability Control, Julia D. Warner

Dissertations, Theses, and Masters Projects

An in situ measurement technique that isolates the mobility of charge carriers is described and analyzed. The technique allows significant improvement over conductivity measurements to monitor changes in the physical properties and state of a material as it cures. This is essential in systems where Ni, the number of charge carriers, cannot be assumed constant such as during cure of epoxies, urethanes and polyimides.;Currently, there is an assumption made in the literature that the number of charge carriers present in a curing material is constant when conductivity is used as an in situ measurement technique to monitor changes in mobility. …

Silica Supported Copper Complexes And Their Biomimetic Activities, Jun Wang

Dissertations, Theses, and Masters Projects

No abstract provided.

Mechanistic Studies On Chlorinated Polymeric Systems, Jing Zhang

Dissertations, Theses, and Masters Projects

No abstract provided.

Net Surface Flux Budget Over Tropical Oceans Estimated From The Tropical Rainfall Measuring Mission (Trmm), Tai-Fang Fan

Dissertations, Theses, and Masters Projects

No abstract provided.

Long Term Permanent Vegetation Plot Studies In The Matoaka Woods, Williamsburg, Virginia : Establishment And Initial Data Analysis Of Plots Established With The North Carolina Vegetation Survey Protocol, Resampling Of Single Circular Plots And A Comparison Of Results From North Carolina Vegetation Survey Protocol And Single Circular Plot Methods, Jacob Robert George Kribel

Dissertations, Theses, and Masters Projects

No abstract provided.

Distribution, Abundance, And Home Range Of The Whip-Poor-Will (Caprimulgus Vociferus) In A Managed Forest Landscape, Michael Daniel Wilson

Dissertations, Theses, and Masters Projects

No abstract provided.

Use Of Ponds And Lakes By Resident Canada Geese, Phillip D. West

Dissertations, Theses, and Masters Projects

No abstract provided.

Center For Coastal Resources Management Annual Report 2002, Center For Coastal Resources Management

Reports

No abstract provided.

Virginia Game Fish Tagging Program Annual Report 2002, John A. Lucy, C.M. Bain Iii

Reports

The Virginia Game Fish Tagging Program (VGFTP), in its eighth year during 2002, systematically trains and assists anglers in tagging a select number of species important to Virginia's marine recreational fishery and maintains the resulting tagging database. A cooperative project of the Virginia Marine Resources Commission and the Virginia Institute of Marine Science (VIMS), the program is primarily funded with revenues from Virginia's saltwater recreational fishing license funds (Recreational Fishing Development Fund). In addition, support for the program is provided by Virginia's Sea Grant Marine Advisory Program at VIMS.

Assessing The Decision-Making Process In Wetlands Resources Management In Virginia, Ratana Chuenpagdee, Kirk J. Havens, Thomas A. Barnard, Patty Richards

Reports

No abstract provided.

The Crest, Winter 2003, Virginia Institute Of Marine Science

Reports

Table of Contents:

• VIMS research helps protect Navy ships from mines
• Moore monitors water quality and seagrasses
• Orth studies seed predators
• Researchers see Bay in a grain of sand
• VIMS reviews VSC proposal
• NAS studies C. ariakensis
• Steinberg conducts zooplankton census
• Russian taxonomist visits
• Schaffner wins award
• VIMS work on hard clams pays off
• VIMS leads Antarctic LTER Program
• VIMS helps manage shellfish waters

Evaluation Of Striped Bass Stocks In Virginia, Monitoring And Tagging Studies, 1999-2003 Annual Report, 1 September 2001 - 31 October 2002, Philip W. Sadler, Robert J. Latour, Robert E. Harris, Kristin L. Maki, John E. Olney

Reports

This report presents the results of striped bass (Marone saxatilis) tagging and monitoring activities in Virginia during the penod 1 September 2001 through 31 October 2002. It includes an assessment of the biological characteristics of striped bass taken from the 2002 spring spawning run, estimates of annual survtval based on annual spring tagging, and the results of the fall 2001 directed mortality study that is cooperative with the Maryland Department of Natural Resources. The information contained in this report is required by the Atlantic States Marine Fisheries Commission and is used to implement a coordinated management plan for striped bass …

Detectability Of Excitatory Versus Inhibitory Drive In An Integrate-And-Fire-Or-Burst Thalamocortical Relay Neuron Model, Gregory D. Smith, S. M. Sherman

Arts & Sciences Articles

Although inhibitory inputs are often viewed as equal but opposite to excitatory inputs, excitatory inputs may alter the firing of postsynaptic cells more effectively than inhibitory inputs. This is because spike cancellation produced by an inhibitory input requires coincidence in time, whereas an excitatory input can add spikes with less temporal constraint. To test for such potential differences, especially in the context of the function of thalamocortical (TC) relay nuclei, we used a stochastic “integrate-and-fire-or-burst” TC neuron model to quantify the detectability of excitatory and inhibitory drive in the presence and absence of the low-threshold Ca 2+ current, IT, and …

Marina Site Suitablity Tool : Final Project Report, Marcia Berman, Kirk J. Havens, Tamia Rudnicky, Thomas A. Barnard

Reports

In coordination with the Department of Conservation and Recreation, the Department of Environmental Quality, the Chesapeake Bay Local Assistance Department and the Virginia Marine Resources Commission (VMRC), the Center for Coastal Resources Management at the Virginia Institute of Marine Science (VIMS) was contracted to develop a tool for local governments that would assist in the decision-making process for marina development. In particular, the agencies wanted to develop a visual representation of the VMRC Criteria for the Siting of Marinas or Community Facilities for Boat Mooring. This was accomplished by gathering available data sets and developing geographic information system (GIS) data …

A Perspective On Two Decades Of Policies And Regulations Influencing The Protection And Restoration Of Submerged Aquatic Vegetation In Chesapeake Bay, Usa, R J. Orth, Ra Batiuk, Pw Bergstrom, Ken Moore

VIMS Articles

Seagrasses along with many other species of freshwater rooted submerged macrophytes in Chesapeake Bay (collectively called SAV) underwent serious declines in population abundances in the 1970s and have not as yet rebounded to previous levels. Cooperative efforts by scientists, politicians, federal and state resource managers, and the general public have developed policies and plans to protect, preserve and enhance SAV populations of Chesapeake Bay. These include the Chesapeake Bay Agreements (1983, 1987, 1992, 1993, 2000), an SAV Management Policy and Implementation Plan for Chesapeake Bay and Tidal Tributaries (1989 and 1990), Chesapeake Bay Blue Crab Fishery Management Plan (1997), as …

City Of Norfolk - Shoreline Situation Report, Marcia Berman, Harry Berquist, Carl Hershner, Sharon Killeen, Tamia Rudnicky, Daniel E. Schatt, David Weiss, Helen Woods

Reports

No abstract provided.

An Analysis Of Shoreline Development Risk For Secondary Dune Systems In Tidewater Virginia With Associated Management Recommendations, Lyle M. Varnell, C. Scott Hardaway Jr.

Reports

This project was done in response to concerns by environmental resource managers of historic and potential adverse impacts to Virginia’s secondary dune ecosystems. Virginia environmental regulatory programs have little decision-making authority over the use of secondary dunes as these areas are not included in the Coastal Primary Sand Dune Act (the Dunes Act). These areas function as estuarine edge habitat and provide natural upland erosion control, and are thus valuable to estuarine and coastal plain fauna and adjacent upland property owners.

The Virginia Wetlands Report Vol. 17, No. 3, Virginia Institute Of Marine Science

Virginia Wetlands Reports

• Red Drum, Sciaenops oscellatus. Walter I. Priest, III
• Marina Site Suitability Tool Available. Marcia Berman, Tamia Rudnicky, Kirk Havens and Thomas Barnard
• Virginia Wetlands Report Reader Survey Result. Tom Barnard
• Sphagnum Moss: Natural Properties Promote Historic Uses. Pam Mason
• Private Piers and Tidal Marsh Cumulative Impacts. Tom Barnard

The Crest, Fall 2002, Virginia Institute Of Marine Science

Reports

Table of Contents:

• VIMS researchers win 5-year, $1.7 million NSF award
• Pair complete 3-year study of clam disease
• VIMS joins National Shark Research Consortium
• McNinch receives Young Investigator award
• Field research sheds light on barndoor skate
• Management is key to scallop fishery's success
• VIMS acquires new code for model
• Yes vote on bond referendum good news for VIMS
• CBNERR announces Summer 2003 educational programs
• Workshop series targets charter boat operators
• Ducklow elected AAAS Fellow
• VIMS takes to the air(port)
• VIMS scientists to host international conferences
• Web update
• VIMS researchers in educational videos
• Hoenig writes "hot paper"
• VIMS and partners win …

Public Beach Assessment Report Central Beach And Castlewood Park Beach Colonial Beach, Virginia, Donna A. Milligan, C. Scott Hardaway Jr., R. H. Brindley, G. R. Thomas

Reports

The purpose of this report is to document the recent history of Colonial Beach’s Potomac River shoreline as well as assess the historical shoreline evolution and status of the beach zone. Review of previously-published literature, field survey data, aerial photos, and computer modeling were used to address the study objectives.

Differences In The Biological Carbon Pump At Three Subtropical Ocean Sites, S Neuer, R Davenport, T Freudenthal, G Wefer, O Llinaus, Mj Rueda, Deborah K. Steinberg, Dm Karl

VIMS Articles

We report primary production of organic matter and organic carbon removal from three subtropical open ocean time-series stations, two located in the Atlantic and one in the Pacific, to quantify the biological components of the oceanic carbon pump. We find that within subtropical gyres, export production varies considerably despite similar phytoplankton biomass and productivity. We provide evidence that the removal of organic carbon is linked to differences in nutrient input into the mixed layer, both from eddy induced mixing and dinitrogen fixation. These findings contribute to our knowledge of the spatial heterogeneity of the subtropical oceans, which make up more …

The Microbial And Metazoan Community Associated With Colonies Of Trichodesmium Spp.: A Quantitative Survey, Cc Sheridan, Deborah K. Steinberg, Gw Kling

VIMS Articles

Association with resource-rich particles may benefit a number of planktonic species in oligotriphic, open-ocean regimes. This study examined communities of microbes and Zooplankton associated with colonies of the cyanobacterium Trichodesmium spp. in the Sargasso Sea. Trichodesmium colonies and seawater controls were collected near Bermuda using SCUBA during September 1995, and June, July and August 1996. Organisms associated with the colonies and those in the surrounding seawater were enumerated using light and fluorescence microscopy. We found that 85% of the Trichodesmium puff and tuft colonies examined harbored associated organisms. Associated organisms included bacteria (rod and coccoid),fungi, pennate diatoms, centric diatoms, heterotrophic …