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11,963 Matching Results
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11,953 - 11,963 of
11,963
Variational Principle for Optimal Accelerated Neutralized Flow
Minimizing the energy deposited in the electron current in neutralized flows, such as in the Hall thruster, is examined. Modifying the electron current along the channel by inserting emitting electrodes, can enhance the efficiency. By employing variational methods, an optimal electron current distribution is found. The efficiency enhancement due to this effect, however, is shown to be small.
Date:
September 1, 2000
Creator:
Fruchtman, A. & Fisch, N. J.
Object Type:
Report
System:
The UNT Digital Library
(Vector) Meson Production and Duality
At high enough energies, hadronic cross sections, if averaged over an appropriate energy range, must coincide with a perturbative QCD description. One famous example in deep inelastic scattering is termed Bloom-Gilman duality. This quark-hadron duality shows that the nucleon resonance region closely mimics the deep inelastic region where we assume single quark scattering to be dominant. This Bloom-Gilman duality was recently found to work to high precision to far lower momentum transfers, and far smaller regions in invariant mass, than anticipated. Implications for using the spin/flavor selectivity of (polarized) electron-proton scattering and/or (polarized) meson electroproduction to examine such duality in more detail are discussed.
Date:
September 1, 2000
Creator:
Ent, R.
Object Type:
Article
System:
The UNT Digital Library
VIRTUAL BANDWIDTH VIA STOCHASTIC POLYSPECTRA
This is the final report of a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The work funded by this grant addresses theoretical issues pertaining to potential applications of higher-order spectra (polyspectra) for communications and measurement. Although the sensitivity to additive Gaussian noise provided a motive for our interest in the bispectrum, the research done here focused on the ability of the bispectrum to see outside the Nyquist interval. The main contribution of this work is a new understanding of the everyday phenomenon of aliasing that is described below. The second contribution this work makes is significant, though limited, progress in understanding the joint realizability, conditions for spectra and bispectra. A third contribution, which arose in efforts to broaden our results on joint realizability, is the awareness that a very common inequality, used to normalize the bispectrum, is invalid. This result has considerable significance for the practical use of the bispectrum.
Date:
September 1, 2000
Creator:
WOLINSKY, M. & VIXIE, K.
Object Type:
Report
System:
The UNT Digital Library
WABASH RIVER COAL GASIFICATION REPOWERING PROJECT
The close of 1999 marked the completion of the Demonstration Period of the Wabash River Coal Gasification Repowering Project. This Final Report summarizes the engineering and construction phases and details the learning experiences from the first four years of commercial operation that made up the Demonstration Period under Department of Energy (DOE) Cooperative Agreement DE-FC21-92MC29310. This 262 MWe project is a joint venture of Global Energy Inc. (Global acquired Destec Energy's gasification assets from Dynegy in 1999) and PSI Energy, a part of Cinergy Corp. The Joint Venture was formed to participate in the Department of Energy's Clean Coal Technology (CCT) program and to demonstrate coal gasification repowering of an existing generating unit impacted by the Clean Air Act Amendments. The participants jointly developed, separately designed, constructed, own, and are now operating an integrated coal gasification combined-cycle power plant, using Global Energy's E-Gas{trademark} technology (E-Gas{trademark} is the name given to the former Destec technology developed by Dow, Destec, and Dynegy). The E-Gas{trademark} process is integrated with a new General Electric 7FA combustion turbine generator and a heat recovery steam generator in the repowering of a 1950's-vintage Westinghouse steam turbine generator using some pre-existing coal handling facilities, interconnections, and other auxiliaries. …
Date:
September 1, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Waste In-Situ Stabilization/Entombment Research and Development Project
The technical basis and stakeholder acceptance of entombment technology is necessary before entombment becomes a decontamination and decommissioning (D&D) option for nuclear reactors. The authors present a research and development (R&D) approach addressing technical basis and stakeholder acceptance of entombment technology. The approach includes a consortium and the conceptual R&D program.
Date:
September 1, 2000
Creator:
Birk, Sandra Margaret; Hanson, Robert Gail & Vernon, Donald Keith
Object Type:
Article
System:
The UNT Digital Library
Waste Isolation Pilot Plant 1999 Site Environmental Report
The U.S. Department of Energy�s (DOE)Carlsbad Area Office and the Westinghouse Waste Isolation Division (WID) are dedicated to maintaining high quality management of Waste Isolation Pilot Plant (WIPP) environmental resources. DOE Order 5400.1, General Environmental Protection Program, and DOE Order 231.1, Environmental, Safety, and Health Reporting, require that the environment at and near DOE facilities be monitored to ensure the safety and health of the public and the environment. This Waste Isolation Pilot Plant 1999 Site Environmental Report summarizes environmental data from calendar year 1999 that characterize environmental management performance and demonstrate compliance with federal and state regulations. This report was prepared in accordance with DOE Order 5400.1, DOE Order 231.1, the Environmental Regulatory Guide for Radiological Effluent Monitoring and Environmental Surveillance (DOE/EH- 0173T), and the Waste Isolation Pilot Plant Environmental Protection Implementation Plan (DOE/WIPP 96-2199). The above orders and guidance documents require that DOE facilities submit an Annual Site Environmental Report to DOE Headquarters, Office of the Assistant Secretary for Environment, Safety, and Health. The purpose of this report is to provide a comprehensive description of operational environmental monitoring activities, to provide an abstract of environmental activities conducted to characterize site environmental management performance to confirm compliance with environmental …
Date:
September 2000
Creator:
Evans, Roy B.; Luft, Amy Adams; Martin, Don; Morris, Randall C.; Reynolds, Timothy D.; Warren, Ronald W. et al.
Object Type:
Report
System:
The UNT Digital Library
WATER AND MAGMA CAN MIX - A HISTORY OF THE CONCEPTS OF HYDROVOLCANISM
None
Date:
September 1, 2000
Creator:
Heiken, G. & Fisher, R.
Object Type:
Article
System:
The UNT Digital Library
Water Temperature vs. BtA Stability Explored
N/A
Date:
September 1, 2000
Creator:
P., Samson & Karns, C.
Object Type:
Report
System:
The UNT Digital Library
Wetland Issues
Wetlands, in a wide variety of forms, are found throughout the country. The various values of these areas have been increasingly recognized in recent years, but the remaining acreage has been disappearing rapidly. When European settlers first arrived, total wetland acreage was more than 220 million acres in the lower 48 states, according to estimates by the U.S. Fish and Wildlife Service. By 1980, total wetland acreage was estimated to be 104 million acres. Losses continue, although the rate of loss hasslowed considerably during the past decade. Recent losses have been concentrated in the lower Mississippi River Valley, the upper Midwest, and the Southeast.
Date:
September 1, 2000
Creator:
Zinn, Jeffrey A. & Copeland, Claudia
Object Type:
Report
System:
The UNT Digital Library
Workforce Education and the Future of the Texas Economy
Technical report discussing the percentage of the educated workers in Texas and possible solutions to increase that percentage found in Austin, Texas.
Date:
September 2000
Creator:
Anari, M. A. & Dotzour, Mark G.
Object Type:
Report
System:
The Portal to Texas History
Y-12 Plant Groundwater Protection Program Groundwater and Surface Water Sampling and Analysis Plan for Calendar Year 2001
None
Date:
September 1, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library