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Articles 31 - 45 of 45
Full-Text Articles in Physical Sciences and Mathematics
Bi(Iii) Initiated Cyclization Reactions And Iodonium Fragmentation Kinetics, Yajing Lian
Bi(Iii) Initiated Cyclization Reactions And Iodonium Fragmentation Kinetics, Yajing Lian
Dissertations, Theses, and Masters Projects
No abstract provided.
Markov Chain Modeling For Multi-Server Clusters, Zhili Hua
Markov Chain Modeling For Multi-Server Clusters, Zhili Hua
Dissertations, Theses, and Masters Projects
No abstract provided.
An Investigation Of Programmer-Identified Concerns, Meghan Kathleen Revelle
An Investigation Of Programmer-Identified Concerns, Meghan Kathleen Revelle
Dissertations, Theses, and Masters Projects
No abstract provided.
Factory: A N Object-Oriented Parallel Programming Substrate For Deep Multiprocessors, Scott Arthur Schneider
Factory: A N Object-Oriented Parallel Programming Substrate For Deep Multiprocessors, Scott Arthur Schneider
Dissertations, Theses, and Masters Projects
No abstract provided.
Iron And Carbon Limitation Of Prokaryotic Growth In The Ocean, Jacques L. Oliver
Iron And Carbon Limitation Of Prokaryotic Growth In The Ocean, Jacques L. Oliver
Dissertations, Theses, and Masters Projects
Studies were undertaken to examine the roles of iron and carbon in modulating prokaryotic growth in the ocean. The context of the first study was an open-open iron fertilization experiment in the high nutrient, low chlorophyll (HNLC) regime in the Southern Ocean. The context of the second study was the oligotrophic, iron-replete, and organic carbon-limited northwest Sargasso Sea. Experimental sea water cultures were amended with an iron chelator, desferrioxamine B (DFOB), and other nutrients to examine the effects of iron and carbon limitation on growth. In the first study prokaryotic abundance, carbon production, and growth rate increased in response to …
The Interaction Between Stratification, Circulation, And Sediment Transport In A Partially-Mixed Estuary, Malcolm E. Scully
The Interaction Between Stratification, Circulation, And Sediment Transport In A Partially-Mixed Estuary, Malcolm E. Scully
Dissertations, Theses, and Masters Projects
Detailed field observations from the York River estuary, Virginia are used to examine the processes governing vertical density stratification and to evaluate the importance of spatial and temporal variations in turbulent mixing on estuarine dynamics and sediment transport. Contrary to previous findings that suggest wind stress acts predominantly as a source of energy to mix away stratification, this study demonstrates that the wind can play a more important role in "straining" the along-channel estuarine density gradient. as a result, down-estuary winds enhance the tidally-averaged vertical shear, which interacts with the along-channel density gradient to increase stratification. Conversely, up-estuary winds tend …
Data Broadcast Scheduling: Models, Algorithms, And Analysis, Aaron Thomas Hawkins
Data Broadcast Scheduling: Models, Algorithms, And Analysis, Aaron Thomas Hawkins
Dissertations, Theses, and Masters Projects
Inherent in the field of data broadcasting is a communication problem in which a server is to transmit a subset of data items in response to requests received from clients. The intent of the server is to optimize metrics quantifying the quality of service the system provides. This method of data dissemination has proved to be an efficient means of delivering information in asymmetric environments demanding massive scalability. of critical importance in such a system is the algorithm used by the server to construct a schedule of item broadcasts.;Due to the real-time nature of this problem, performances of heuristics designed …
Photochemical Modification Of Polyethylene Terephthalate Surface, Zhengmao Zhu
Photochemical Modification Of Polyethylene Terephthalate Surface, Zhengmao Zhu
Dissertations, Theses, and Masters Projects
The prospect of obtaining desired surface-mediated characteristics while retaining bulk-mediated physical properties and avoiding potential environmental issues with wet chemical technology lends considerable appeal to photochemical approaches to surface modification.;We undertook a combined experimental and computational approach to investigate the effect of deep UV irradiation on the polyethylene terephthalate (PET) surface. its response to 172 nm UV from a xenon examiner lamp in the absence of oxygen was characterized with X-ray Photoelectron Spectroscopy (XPS), Time of Flight/Secondary Ion Mass Spectrometry (ToF/SIMS), transmission infrared spectroscopy (IR), and Atomic Force Microscopy (AFM). The surface chemistry details suggested that the primary photochemical reactions …
Effects Of Salinity And Nitrogen On The Distribution And Growth Of Phragmites Australis Along The Rappahannock River, Carmen Rebekah Packett
Effects Of Salinity And Nitrogen On The Distribution And Growth Of Phragmites Australis Along The Rappahannock River, Carmen Rebekah Packett
Dissertations, Theses, and Masters Projects
No abstract provided.
Techniques Of Data Prefetching, Replication, And Consistency In The Internet, Xin Chen
Techniques Of Data Prefetching, Replication, And Consistency In The Internet, Xin Chen
Dissertations, Theses, and Masters Projects
Internet has become a major infrastructure for information sharing in our daily life, and indispensable to critical and large applications in industry, government, business, and education. Internet bandwidth (or the network speed to transfer data) has been dramatically increased, however, the latency time (or the delay to physically access data) has been reduced in a much slower pace. The rich bandwidth and lagging latency can be effectively coped with in Internet systems by three data management techniques: caching, replication, and prefetching. The focus of this dissertation is to address the latency problem in Internet by utilizing the rich bandwidth and …
Nuclear Magnetic Resonance Studies Of Relaxor Ferroelectrics, William J. Brouwer
Nuclear Magnetic Resonance Studies Of Relaxor Ferroelectrics, William J. Brouwer
Dissertations, Theses, and Masters Projects
This work is devoted to the study of local order in the ferroelectric PbSc1/2Ta1/2O3 (PST) and relaxor ferroelectric solid solutions (1-x)PbSC2/3W1/3O3-(x)PbTiO 3 (PSW-PT), (1x)PbSC2/3W1/3O3-(x)PbZrO 3 (PSW-PZ). Novel Magic Angle Spinning (MAS) Solid State Nuclear Magnetic Resonance (SS-NMR) experiments, including Multiple Quantum MAS (MQMAS) and Double Quantum Filtered Satellite Transition (DQF-STMAS), have been performed on these materials. A gamma function model is proposed for the distribution of quadrupole coupling constants, based on the Poissonian nature of atomic displacements. Moments for distributions may be subsequently extracted through agreement between experimental spectra and simulations implemented in novel programs. Simple crystal compound scandium oxide …
Estimation Of Annual And Semi-Annual Survival Of Adult Female Blue Crabs And Assessment Of The Effectiveness Of The Virginia Blue Crab Sanctuary Using Tag-Return Methodology, Debra M. Lambert
Dissertations, Theses, and Masters Projects
The blue crab fishery is the most valuable commercial fishery in Chesapeake Bay. The Chesapeake Bay stock recently experienced a period of overfishing, which has resulted in below average abundances, and the spawning stock has experienced an 84 % decline in biomass relative to levels in the late 1980s. The status of the stock is determined by comparing current estimates of mortality to biological reference points. Given the current focus on blue crab conservation, there is a need to obtain reliable, empirical estimates of survival to compare to the biological reference points. A tagging program was initiated on the terminally-molted, …
Investigation Of The Life History Of The Cownose Ray, Rhinoptera Bonasus (Mitchill 1815), Donna S. Grusha
Investigation Of The Life History Of The Cownose Ray, Rhinoptera Bonasus (Mitchill 1815), Donna S. Grusha
Dissertations, Theses, and Masters Projects
No abstract provided.
Effects Of Human Disturbance On The Breeding Success Of Eastern Bluebirds (Sialia Sialis), Caitlin Rebecca Kight
Effects Of Human Disturbance On The Breeding Success Of Eastern Bluebirds (Sialia Sialis), Caitlin Rebecca Kight
Dissertations, Theses, and Masters Projects
No abstract provided.
Characteristics Of Vesicomyid Clams And Their Environment At The Blake Ridge Cold Seep, Taylor Perrine Heyl
Characteristics Of Vesicomyid Clams And Their Environment At The Blake Ridge Cold Seep, Taylor Perrine Heyl
Dissertations, Theses, and Masters Projects
No abstract provided.