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36,947 Matching Results

Start Over Year 2005 Language English

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prev Results: 36,937 - 36,947 of 36,947
Best Match Title Creator Date Created (Newest) Date Created (Oldest) Date Added (Newest) Date Added (Oldest)
Studies of Low-Coordinate Iron Dinitrogen Complexes (open access)

Studies of Low-Coordinate Iron Dinitrogen Complexes

This article discusses low-coordinate iron dinitrogen complexes. Understanding the interaction of N₂ with iron is relevant to the iron catalyst used in the Haber process and to possible roles of the FeMoco active site of nitrogenase.
Date: December 31, 2005
Creator: Smith, Jeremy M.; Sadique, Azwana R.; Cundari, Thomas R., 1964-; Rodgers, Kenton R.; Lukat-Rodgers, Gudrun; Lachicotte, Rene J. et al.
Object Type: Article
System: The UNT Digital Library
Supported, Alkali-Promoted Cobalt Oxide Catalysts for NOx Removal from Coal Combustion Flue Gases (open access)

Supported, Alkali-Promoted Cobalt Oxide Catalysts for NOx Removal from Coal Combustion Flue Gases

A series of cobalt oxide catalysts supported on alumina ({gamma}-Al{sub 2}O{sub 3}) were synthesized with varying contents of cobalt and of added alkali metals, including lithium, sodium, potassium, rubidium, and cesium. Unsupported cobalt oxide catalysts and several cobalt oxide catalysts supported ceria (CeO{sub 2}) with varying contents of cobalt with added potassium were also prepared. The catalysts were characterized with UV-visible spectroscopy and were examined for NO{sub x} decomposition activity. The CoO{sub x}/Al{sub 2}O{sub 3} catalysts and particularly the CoO{sub x}/CeO{sub 2} catalysts show N{sub 2}O decomposition activity, but none of the catalysts (unsupported Co{sub 3}O{sub 4} or those supported on ceria or alumina) displayed significant, sustained NO decomposition activity. For the Al{sub 2}O{sub 3}-supported catalysts, N{sub 2}O decomposition activity was observed over a range of reaction temperatures beginning about 723 K, but significant (>50%) conversions of N{sub 2}O were observed only for reaction temperatures >900 K, which are too high for practical commercial use. However, the CeO{sub 2}-supported catalysts display N{sub 2}O decomposition rates similar to the Al{sub 2}O{sub 3}-supported catalysts at much lower reaction temperatures, with activity beginning at {approx}573 K. Conversions of >90% were achieved at 773 K for the best catalysts. Catalytic rates per cobalt atom …
Date: December 31, 2005
Creator: Argyle, Morris D.
Object Type: Report
System: The UNT Digital Library
The Tapestry of Life: Lateral Transfers of Heritable Elements - Scientific Meeting (open access)

The Tapestry of Life: Lateral Transfers of Heritable Elements - Scientific Meeting

The Sackler Colloquium The Tapestry of Life: Lateral Transfers of Heritable Elements was held on December 12-13, 2005. What Darwin saw as a tree of life descending in a linear fashion, is now more accurately seen as a tapestry of life, an anastomosing network, with important lateral transfers of heritable elements among parallel lines of descent These transfers range in complexity from small insertion sequences, to whole genes, gene islands, and portions of whole genomes which may be combined in symbiogenesis. The colloquium brought together researchers, empirical and theoretical, working at all levels on genomics, comparative genomics, and metagenomics to identify common and differentiating features of lateral gene transfer and to examine their implications for science and for human concerns.
Date: December 31, 2005
Creator: Fraser, Claire M.
Object Type: Report
System: The UNT Digital Library
Time-Lapse Modeling and Inversion of CO2 Saturation for Sequestration and Enhanced Oil Recovery (open access)

Time-Lapse Modeling and Inversion of CO2 Saturation for Sequestration and Enhanced Oil Recovery

None
Date: December 31, 2005
Creator: Meadows, Mark A.
Object Type: Report
System: The UNT Digital Library
Tobacco Farmer Assistance (open access)

Tobacco Farmer Assistance

None
Date: December 31, 2005
Creator: Womach, Jasper
Object Type: Report
System: The UNT Digital Library
Tobacco Farmer Assistance (open access)

Tobacco Farmer Assistance

None
Date: December 31, 2005
Creator: Womach, Jasper
Object Type: Report
System: The UNT Digital Library
Tobacco Price Support: An Overview of the Program (open access)

Tobacco Price Support: An Overview of the Program

None
Date: December 31, 2005
Creator: unknown
Object Type: Report
System: The UNT Digital Library
Tobacco Quota Buyout (open access)

Tobacco Quota Buyout

Report on the termination of U.S. tobacco farm price supports and the ripple effects of this decision, including payments to quota holders, producers, lump sum payments, imports, and more.
Date: December 31, 2005
Creator: Womach, Jasper
Object Type: Report
System: The UNT Digital Library
Underground Coal Gasification Test Project (open access)

Underground Coal Gasification Test Project

None
Date: December 31, 2005
Creator: Dennis, D. Steve
Object Type: Report
System: The UNT Digital Library
Use of the GranuFlow Process in Coal Preparation Plants to Improve Energy Recovery and Reduce Coal Processing Wastes (open access)

Use of the GranuFlow Process in Coal Preparation Plants to Improve Energy Recovery and Reduce Coal Processing Wastes

With the increasing use of screen-bowl centrifuges in today's fine coal cleaning circuits, a significant amount of low-ash, high-Btu coal can be lost during the dewatering step due to the difficulty in capturing coal of this size consist (< 100 mesh or 0.15mm). The GranuFlow{trademark} technology, developed and patented by an in-house research group at DOE-NETL, involves the addition of an emulsified mixture of high-molecular-weight hydrocarbons to a slurry of finesized coal before cleaning and/or mechanical dewatering. The binder selectively agglomerates the coal, but not the clays or other mineral matter. In practice, the binder is applied so as to contact the finest possible size fraction first (for example, froth flotation product) as agglomeration of this fraction produces the best result for a given concentration of binder. Increasing the size consist of the fine-sized coal stream reduces the loss of coal solids to the waste effluent streams from the screen bowl centrifuge circuit. In addition, the agglomerated coal dewaters better and is less dusty. The binder can also serve as a flotation conditioner and may provide freeze protection. The overall objective of the project is to generate all necessary information and data required to commercialize the GranuFlow{trademark} Technology. The technology …
Date: December 31, 2005
Creator: Shirey, Glenn A. & Akers, David J.
Object Type: Report
System: The UNT Digital Library
Void Coalescence Processes Quantified through Atomistic and Multiscale Simulation (open access)

Void Coalescence Processes Quantified through Atomistic and Multiscale Simulation

Simulation of ductile fracture at the atomic scale reveals many aspects of the fracture process including specific mechanisms associated with void nucleation and growth as a precursor to fracture and the plastic deformation of the material surrounding the voids and cracks. Recently we have studied void coalescence in ductile metals using large-scale atomistic and continuum simulations. Here we review that work and present some related investigations. The atomistic simulations involve three-dimensional strain-controlled multi-million atom molecular dynamics simulations of copper. The correlated growth of two voids during the coalescence process leading to fracture is investigated, both in terms of its onset and the ensuing dynamical interactions. Void interactions are quantified through the rate of reduction of the distance between the voids, through the correlated directional growth of the voids, and through correlated shape evolution of the voids. The critical inter-void ligament distance marking the onset of coalescence is shown to be approximately one void radius based on the quantification measurements used, independent of the initial separation distance between the voids and the strain-rate of the expansion of the system. No pronounced shear flow is found in the coalescence process.
Date: December 31, 2005
Creator: Rudd, R E; Seppala, E T; Dupuy, L M & Belak, J
Object Type: Article
System: The UNT Digital Library