2,919 Matching Results

Search Results

Advanced search parameters have been applied.
in creator/contributor: "United States"  
Results: 1 - 24 next
open access

The Use of Tree Shelters in Restoring Forest Species to a Floodplain Delta: 5 Year Results

Description: The use of tree shelters to enhance survival and growth of bald cypress, water tupelo, green ash, and black tupelo were evaluated in the riparian and swamp forest of the Pen Branch delta. Survival at the end of the five years ranged from 67% to 100% for seedlings in shelters and 2% to 90% for those in the open. Mortality resulted primarily from beavers. Height growth was only improved for seedlings in shelters for the first few years.
Date: March 19, 1999
Creator: Conner, W. H.; Inabinette, L. W. & Brantley, E. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Toroid Rotation in Neutral Beam Heated Discharges in Diii-D

Description: It is known that the toroidal angular momentum and the ion thermal energy are correlated in tokamak discharges heated by neutral beam injection. Here, data from ten years of measurements on DIII-D are considered, for representative discharges from all types and all conditions. The ratio of simple replacement times for momentum and energy is found to order this correlation indicating that these times are approximately equal, across the minor radius. Representative discharges of several types are… more
Date: August 1, 2002
Creator: deGrassie, J. S.; Baker, D. R.; Burrell, K. H.; Gohil, P.; Greenfield, C. M.; Groebner, R. J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Suppression of Large Edge Localized Modes in High Confinement DIII-D Plasmas With a Stochastic Magnetic Boundary

Description: OAK-B135 A stochastic magnetic boundary, produced by an externally applied edge resonant magnetic perturbation, is used to suppress large edge localized modes (ELMs) in high confinement (H-mode) plasmas. The resulting H-mode displays rapid, small oscillations with a bursty character modulated by a coherent 130 Hz envelope. The H-mode transport barrier is unaffected by the stochastic boundary. The core confinement of these discharges is unaffected, despite a three-fold drop in the toroidal rotat… more
Date: November 1, 2003
Creator: Evans, T. E.; Moyer, R. A.; Thomas, P. R.; Watkins, J. G.; Osborne, T. H.; Boedo, J. A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Toxicity Bioassays for Ecological Risk Assessment in Arid and Semiarid Ecosystems. Reviews Environmental Contamination and Toxicology 168:43-98.

Description: This paper discusses current limitations for performing ecological risk assessments in dry environments (i.e., ecosystems that are characteristic of many DOE Facilities) and presents novel approaches to addressing ecological risk in such systems.
Date: February 2001
Creator: Markwiese, J. T.; Ryti, R. T.; Hooten, M. M.; Michael, D. I. & Hlohowskyj, I.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Tokamak Equilibria With Central Current Holes and Negative Current Drive

Description: OAK B202 TOKAMAK EQUILIBRIA WITH CENTRAL CURRENT HOLES AND NEGATIVE CURRENT DRIVE. Several tokamak experiments have reported the development of a central region with vanishing currents (the current hole). Straightforward application of results from the work of Greene, Johnson and Weimer [Phys. Fluids, 3, 67 (1971)] on tokamak equilibrium to these plasmas leads to apparent singularities in several physical quantities including the Shafranov shift and casts doubts on the existence of this type of… more
Date: June 1, 2002
Creator: Chu, M. S. & Parks, P. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

RESERVOIR CHARACTERIZATION OF THE LOWER GREEN RIVER FORMATION, SOUTHWEST UINTA BASIN, UTAH

Description: The +2000-foot-thick (600-m), Tertiary-aged lacustrine deposits of the Middle and Lower Members of the Green River Formation contain the primary oil-producing reservoirs in the southwest Uinta Basin. The authors developed a log-based correlation scheme by identifying what they interpret as depositional cycles on the gamma-ray and resistivity logs of several wells. Regional cross sections were constructed and cycle boundaries revised as needed. The cycles typically range from 50 to 100 feet (15-… more
Date: August 17, 1999
Creator: Morgan, C.D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Q{sup 2} evolution of the generalized Gerasimov-Drell-Hearn integral for the neutron using a {sup 3}He target

Description: The authors present data on the inclusive scattering of polarized electrons from a polarized {sup 3}He target at energies from 0.862 to 5.06 GeV, obtained at a scattering angle of 15.5{sup o}. The data include measurements from the quasielastic peak, through the resonance region, to the beginning of the deep inelastic regime, and were used to determine the virtual photon cross-section difference {sigma}{sub 1/2}-{sigma}{sub 3/2}. They extract the extended Gerasimov-Drell-Hearn integral for the … more
Date: July 2002
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Field Test Program to Develop Comprehensive Design, Operating and Cost Data for Mercury Control Systems on Non-Scrubbed Coal-Fired Boilers, Quarterly Technical Report: January-March 2004

Description: With the nation's coal-burning utilities facing the possibility of tighter controls on mercury pollutants, the U.S. Department of Energy is funding projects that could offer power plant operators better ways to reduce these emissions at much lower costs. Mercury is known to have toxic effects on the nervous systems of humans and wildlife. Although it exists only in trace amounts in coal, mercury is released when coal burns and can accumulate on land and in water. In water, bacteria transform th… more
Date: April 27, 2004
Creator: Bustard, Jean
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

University Reactor Sharing Program

Description: Research projects supported by the program include items such as dating geological material and producing high current super conducting magnets. The funding continues to give small colleges and universities the valuable opportunity to use the NSC for teaching courses in nuclear processes; specifically neutron activation analysis and gamma spectroscopy. The Reactor Sharing Program has supported the construction of a Fast Neutron Flux Irradiator for users at New Mexico Institute of Mining and Tec… more
Date: February 24, 2004
Creator: Reese, W. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of More-Efficient Gas Flooding Applicable to Shallow Reservoirs Progress Report

Description: The objective of this research is to widen the applicability of gas flooding to shallow oil reservoirs by reducing the pressure required for miscibility using gas enrichment and increasing sweep efficiency with foam. Task 1 examines the potential for improved oil recovery with enriched gases. Subtask 1.1 examines the effect of dispersion processes on oil recovery and the extent of enrichment needed in the presence of dispersion. Subtask 1.2 develops a fast, efficient method to predict the exten… more
Date: January 28, 2003
Creator: Rossen, William R.; Johns, Russell T. & Pope, Gary A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Wireless Mine-Wide Telecommunications Technology: Final Technical Progress Report

Description: A comprehensive mine-wide, two-way wireless voice and data communication system for the underground mining industry was developed. The system achieves energy savings through increased productivity and greater energy efficiency in meeting safety requirements within mines. The mine-wide system is comprised of two interfaced subsystems: a through-the-earth communications system and an in-mine communications system. The mine-wide system permits two-way communication among underground personnel and … more
Date: March 2004
Creator: Meiksin, Zvi H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

CONTROL OF INTERFACIAL DUST CAKE TO IMPROVE EFFICIENCY OF MOVING BED GRANULAR FILTERS

Description: The goal of this research is to improve the performance of moving bed granular filters for gas cleaning at high temperatures and pressures. A second objective is to better understand dust capture interfacial phenomena and cake formation in moving bed filters. The experimental bed tested in the present study has several unique design features configured as cold flow, axially symmetric, counter-current flow to simulate a filter operating at high temperatures (1088 K) and elevated pressures (10 at… more
Date: October 31, 2002
Creator: Brown, Robert C. & Colver, Gerald M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

REFINERY INTEGRATION OF BY-PRODUCTS FROM COAL-DERIVED JET FUELS

Description: This report summarizes the accomplishments toward project goals during the first six months of the second year of the project to assess the properties and performance of coal based products. These products are in the gasoline, diesel and fuel oil range and result from coal based jet fuel production from an Air Force funded program. Specific areas of progress include generation of coal based material that has been fractionated into the desired refinery cuts, acquisition and installation of a res… more
Date: May 18, 2005
Creator: Rudnick, Leslie R.; Boehman, Andre; Song, Chunshan; Miller, Bruce & Mitchell, Gareth
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fabrication of Gas-Filled Tungsten-Coated Glass Shells

Description: OAK-B135 Deuterium (D{sub 2}) filled glass shells coated with a high Z element are needed for high energy density (HED) experiments by researchers at Los Alamos National Laboratory. They report here on our initial attempt to produce such shells. Glass shells made using the drop tower technique were coated with gold, palladium or tungsten, or a mixture of two of these elements. It was found that gold and palladium coatings did not stick well to the glass and resulted in poor or delaminated films… more
Date: June 1, 2003
Creator: Nikroo, A.; Baugh, W. & Steinman, D. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

BOILER MATERIALS FOR ULTRASUPERCRITICAL COAL POWER PLANTS

Description: The principal objective of this project is to develop materials technology for use in ultrasupercritical (USC) plant boilers capable of operating with 760 C (1400 F), 35 MPa (5000 psi) steam. This project has established a government/industry consortium to undertake a five-year effort to evaluate and develop of advanced materials that allow the use of advanced steam cycles in coal-based power plants. These advanced cycles, with steam temperatures up to 760 C, will increase the efficiency of coa… more
Date: October 20, 2003
Creator: Viswanathan, R.; Coleman, K.; Swindeman, R.W.; Sarver, J.; Blough, J.; Mohn, W. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

MANUFACTURING OF MAGNETIC PROBE COILS FOR DIII-D

Description: OAK-B135 The magnetic diagnostics program at DIII-D adds to its in-vessel installations of induction-type loops and coils almost every year. The current design of toroidal and poloidal magnetic field coils (45-50 kHz, N {center_dot} A = 0.06 m{sup 2}) has been in existence since 1987. Many coils were installed in DIII-D during that year and are still operating and reliable today. The high reliability of the coils is owing to the use of a continuous length of mineral-insulated cable, eliminating… more
Date: October 1, 2003
Creator: Bozek, A. S. & Strait, E. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

LAUNCHER PERFORMANCE AND THERMAL CAPABILITY OF THE DIII-D ECH SYSTEM

Description: OAK-B135 The temperatures of components of DIII-D ECH launchers were observed during 2003 tokamak operation. The injected power was typically 500-700 kW and the pulse length was typically 2s. Plasma shots were performed at intervals of about 17 min from 9 a.m. to 5 p.m. The temperatures of a movable mirror, a fixed mirror and a launcher reached an equilibrium after about six hours of repetitive pulsing. The saturation temperature depends to some extent on the plasma stored energy. However, even… more
Date: October 1, 2003
Creator: Kajiwara, K.; Lohr, J.; Gorelov, I .A.; Green, M. T.; Ponce, D.; Callis, R. W. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

DEVELOPING STATE POLICIES SUPPORTIVE OF BIOENERGY DEVELOPMENT

Description: Working within the context of the Southern States Biobased Alliance (SSBA) and with officials in each state, the Southern States Energy Board (SSEB) is identifying bioenergy-related policies and programs within each state to determine their impact on the development, deployment or use of bioenergy. In addition, SSEB will determine which policies have impacted industry's efforts to develop, deploy or use biobased technologies or products. As a result, SSEB will work with the Southern States Biob… more
Date: October 31, 2003
Creator: Baskin, Kathryn
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

DEVELOPMENT OF PRESSURIZED CIRCULATIONG FLUIDIZED BED PARTIAL GASIFICATION MODULE(PGM)

Description: Foster Wheeler Power Group, Inc. is working under US Department of Energy contract No. DE-FC26-00NT40972 to develop a partial gasification module (PGM) that represents a critical element of several potential coal-fired Vision 21 plants. When utilized for electrical power generation, these plants will operate with efficiencies greater than 60% and produce near zero emissions of traditional stack gas pollutants. The new process partially gasifies coal at elevated pressure producing a coal-derived… more
Date: April 17, 2003
Creator: Robertson, Archie
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

NANOSTRUCTURED CERAMICS AND COMPOSITES FOR REFRACTORY APPLICATIONS IN COAL GASIFICATION

Description: A class of ceramics, capable of exhibiting low coefficients of thermal expansion and catalytic properties was investigated. Investigations were directed towards nanoengineering of NZP ceramics and NZP-based composites by chemical means by controlling their compositions and processing variables. NaZr{sub 2}(PO{sub 4}){sub 3} (NZP) was synthesized by combining water-soluble precursors leading to the precipitation of a gel that was dried, calcined, pressed into pellets, then fired at 850 C. Withou… more
Date: January 31, 2005
Creator: Brown, Paul
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

BASIN ANALYSIS AND PETROLEUM SYSTEM CHARACTERIZATION AND MODELING, INTERIOR SALT BASINS, CENTRAL AND EASTERN GULF OF MEXICO

Description: The principal research effort for Year 1 of the project is data compilation and the determination of the tectonic and depositional histories of the North Louisiana Salt Basin. In the first three (3) to six (6) months of Year 1, the research focus is on data compilation and the remainder of the year the emphasis is on the tectonic and depositional histories of the basin. No major problems have been encountered to date, and the project is on schedule. The principal objectives of the project are t… more
Date: February 5, 2004
Creator: Mancini, Ernest A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

ENHANCED PRACTICAL PHOTOSYNTHETIC CO{sub 2} MITIGATION

Description: This quarterly report documents significant achievements in the Enhanced Practical Photosynthetic CO{sub 2} Mitigation project during the period from 1/2/2004 through 4/1/2004. Specific results and accomplishments for the first quarter of 2004 include: (1) CRF-2 test system: After the recent successful test results were achieved, the system was taken off-line for re-sealing and other operational improvements to prepare for the next level of testing, which will include direct measurement of carb… more
Date: April 15, 2004
Creator: Kremer, Gregory; Bayless, David J.; Vis, Morgan; Prudich, Michael; Cooksey, Keith & Muhs, Jeff
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Migration and Entrapment of DNAPLs in Heterogeneous Systems: Impact of Waste and Porous Medium Composition

Description: Dense nonaqueous phase liquids (DNAPLs) pose a significant threat to soil and groundwater at Department of Energy (DOE) sites. Evidence suggests that subsurface wettability variations are present at many of these sites as a result of spatical and temporal variations in aqueous phase chemistry, contaminant aging, mineralogy and organic matter. The presence of such heterogeneity may significantly influence DNAPL migration and entrapment in the saturated zone.
Date: January 10, 2005
Creator: Abriola, Linda M. & Demond, Avery H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

ENHANCED HYDROGEN PRODUCTION INTEGRATED WITH CO2 SEPARATION IN A SINGLE-STAGE REACTOR

Description: The water gas shift reaction (WGSR) plays a major role in increasing the hydrogen production from fossil fuels. However, the enhanced hydrogen production is limited by thermodynamic constrains posed by equilibrium limitations of WGSR. This project aims at using a mesoporous, tailored, highly reactive calcium based sorbent system for incessantly removing the CO{sub 2} product which drives the equilibrium limited WGSR forward. In addition, a pure sequestration ready CO{sub 2} stream is produced s… more
Date: March 10, 2005
Creator: Gupta, H.; Iyer, M.; Sakadjian, B. & Fan, Liang-Shih
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen