147 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Urea"  
prev Results: 49 - 72 next
open access

Repair of DNA treated with. gamma. -irradiation and chemical carcinogens. Progress report, June 1, 1975--January 31, 1976. [MMS, methylnitrosourea, 7-bromomethyl-12-methylbenz(a)-anthracene, Escherichia coli]

Description: Enzymatic mechanisms of DNA repair are under investigation. From E. coli an endonuclease active on apurinic acid has been separated from endonuclease II active on DNA treated with methylmethane sulfonate, methylnitrosourea, 7-bromomethyl-12-methylbenz(a)anthracene and ..gamma..-irradiation. Mutants have been identified for each enzyme. The purification of both enzymes is proceeding and the mechanism of action of endonuclease II which has both an N-glycosidase and a phosphodiester hydrolase acti… more
Date: February 1, 1976
Creator: Goldthwait, D. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Integrated dry NO sub x /SO sub 2 emissions control system

Description: The DSI system design is approximately eighty percent completed. About eighty percent of the materials have been purchased for erection and setup of the DSI system. Most of the equipment and supply purchases have been made for the DCS. The Unit 4 outage started March 20, 1992 for the installation of the remaining project equipment. overall field construction activities continued on the flyash, boiler, dry sorbent injection and humidification systems. Noell performed startup and testing activiti… more
Date: May 15, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Integrated dry NO{sub x}/SO{sub 2} emissions control system. Quarterly report No. 3, July 1--September 30, 1991

Description: This project`s goal is to demonstrate the removal up to 70% of the NO{sub x} and 70% of the SO{sub 2} emissions from coal fired utility boilers. It will establish an alternative emissions control technology integrating a combination of several processes, while minimizing capital expenditures and limiting waste production to dry solids that are handled with conventional ash removal equipment. These processes include low-NO{sub x} burners, NO{sub x} ports and urea injection for NO{sub x} control,… more
Date: October 15, 1991
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Integrated dry NO{sub x}/SO{sub 2} emissions control system. Quarterly report No. 1, January 1--March 31, 1991

Description: This project`s goal is to demonstrate the removal up to 70% of the NO{sub x} and 70% of the SO{sub 2} emissions from coal fired utility boilers. It will establish an alternative emissions control technology integrating a combination of several processes, while minimizing capital expenditures and limiting waste production to dry solids that are handled with convention ash removal equipment. These processes include low-NO{sub x} burners and urea injection for NO{sub x} control, sodium- or calcium… more
Date: September 10, 1991
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Emerging flue-gas cleanup technologies for combined control of SO{sub 2} and NO{sub x}

Description: Enactment of the 1990 Clean Air Act Amendments, as well as passage of legislation at the state level has raised the prospect of more stringent nitrogen oxides (NO{sub x}) emission regulations and has fueled research and development efforts on a number technologies for the combined control of sulfur dioxide (SO{sub 2}) and NO{sub x}. The integrated removal of both SO{sub 2} and NO{sub x} in a single system can offer significant advantages over the use of several separate processes, including suc… more
Date: June 1, 1994
Creator: Livengood, C. D. & Markussen, J. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Proof of concept testing of an integrated dry injection system for SO2/NOx control. Quarterly technical progress report, October--December 1991

Description: The objective of the subscale test program were designed to provide sorbent and additive selection guidance, and, in so doing, supply answers to the questions posed in the preceding section. The objectives are: Identify the best commercial hydrate sorbent and the best enhanced hydrate sorbent from a list of nine types, based upon S0{sub 2} removal at Ca/S=2. Determine the relative effectiveness of sodium sesquicarbonate versus sodium bicarbonate for S0{sub 2} and NO{sub x} control over the temp… more
Date: December 31, 1991
Creator: Helfritch, D. J.; Bortz, S. J. & Beittel, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of advanced NO{sub x} control concepts for coal-fired utility boilers. Quarterly technical progress report No. 4, July 1, 1991--September 30, 1991

Description: CombiNO{sub x} is a NO{sub x} reduction process which incorporates three different NO{sub x} control technologies: reburning, selective non-catalytic reduction (SNCR), and methanol injection. Gas reburning is a widely used technology that has been proven to reduce NO{sub x} up to 60% on full-scale applications. The specific goals of the CombiNO{sub x} project are: 70% NO{sub x} reduction at 20% of the cost of selective catalytic reduction; NO{sub x} levels at the stack of 60 ppm for ozone non-a… more
Date: June 23, 1992
Creator: Evans, A.; Newhall, J.; England, G. & Seeker, W. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Integrated Dry NO{sub x}/SO{sub 2} Emissions Control System baseline test report, November 11--December 15, 1991

Description: The DOE sponsored Integrated Dry NO{sub x}/SO{sub 2} Emissions Control System program, which is a Clean Coal Technology Ill demonstration, is being conducted by Public Service Company of Colorado. The test site is Arapahoe Generating Station Unit 4, which is a 100 MWe, down-fired utility boiler burning a low sulfur western coal. The project goal is to demonstrate 70 percent reductions in NO{sub x} and S0{sub 2} emissions through the integration of: (1) down-fired low-NO{sub x} burners with over… more
Date: March 1, 1992
Creator: Shiomoto, G. H. & Smith, R. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Report for General Research September 18 to December 11, 1950 (Radium Volume)

Description: The purpose of the research work reported in this volume is the development of a process for the separation and subsequent purification of radium from the K-65 (pitchblende) residue. Except for the accumulation of additional experimental data the process is essentially complete. After a preliminary extraction of about 85% of the lead and 40% of the silica with a 40% sodium hydroxide solution, the residue is treated with a solution containing both sodium hydroxide and sodium carbonate to obtain … more
Date: January 15, 1951
Creator: Haring, M. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Selection and Characterization of Carbon Black and Surfactants for Development of Small Scale Uranium Oxicarbide Kernels

Description: This report supports the effort for development of small scale fabrication of UCO (a mixture of UO{sub 2} and UC{sub 2}) fuel kernels for the generation IV high temperature gas reactor program. In particular, it is focused on optimization of dispersion conditions of carbon black in the broths from which carbon-containing (UO{sub 2} {center_dot} H{sub 2}O + C) gel spheres are prepared by internal gelation. The broth results from mixing a hexamethylenetetramine (HMTA) and urea solution with an ac… more
Date: January 1, 2006
Creator: Contescu, Cristian I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Inexpensive CO2 Thickening Agents for Improved Mobility Control of CO2 Floods

Description: The objective of this research was the design, synthesis and evaluation of inexpensive, non-fluorous carbon dioxide thickening agents. We followed the same strategy employed in the design of fluorinated CO{sub 2} polymeric thickeners. First, a highly CO{sub 2}-philic, hydrocarbon-based monomer was to be identified. Polymers or oligomers of this monomer were then synthesized. The second step was to design a CO{sub 2}-thickener based on these CO{sub 2}-philic polymers. Two types of thickeners wer… more
Date: August 31, 2005
Creator: Enick, Robert; Beckman, Eric & Hamilton, Andrew
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Aqueous and gaseous nitrogen losses induced by fertilizer application

Description: In recent years concern has grown over the contribution of nitrogen (N) fertilizer use to nitrate (NO{sub 3}{sup -}) water pollution and nitrous oxide (N{sub 2}O), nitric oxide (NO), and ammonia (NH{sub 3}) atmospheric pollution. Characterizing soil N effluxes is essential in developing a strategy to mitigate N leaching and emissions to the atmosphere. In this paper, a previously described and tested mechanistic N cycle model (TOUGHREACT-N) was successfully tested against additional observation… more
Date: January 15, 2009
Creator: Gu, C.; Maggi, F.; Riley, W. J.; Hornberger, G. M.; Xu, T.; Oldenburg, C. M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design, Synthesis, and Mechanistic Evaluation of Iron-Based Catalysis for Synthesis Gas Conversion to Fuels and Chemicals

Description: A detailed study of the catalyst composition, preparation and activation protocol of Fe-based catalysts for the Fischer-Tropsch Synthesis (FTS) have been carried out in this project. We have studied the effects of different promoters on the catalytic performance of Fe-based catalysts. Specifically, we have focused on how their sequence of addition dramatically influences the performance of these materials in the Fischer-Tropsch synthesis. The resulting procedures have been optimized to improve … more
Date: September 30, 2007
Creator: Iglesia, Enrique; Ishikawa, Akio; Ojeda, Manual & Yao, Nan
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Kootenay Lake Fertilization Experiment; Years 11 and 12, Technical Report 2002-2003.

Description: This report examines the results from the eleventh and twelfth years (2002 and 2003) of the Kootenay Lake fertilization experiment. Experimental fertilization has occurred with an adaptive management approach since 1992 in order to restore productivity lost as a result of upstream dams. One of the main objectives of the experiment is to restore kokanee (Oncorhynchus nerka) populations, which are a main food source for Gerrard rainbow trout (Oncorhynchus mykiss). Kootenay Lake is located between… more
Date: February 1, 2007
Creator: Schindler, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Second Generation Advanced Reburning for High Efficiency NOx Control

Description: This project is designed to develop a family of novel NO{sub x} control technologies, called Second Generation Advanced Reburning (SGAR) which has the potential to achieve 90+ NO{sub x} control in coal-fired boilers at a significantly lower cost than SCR. The eleventh reporting period in Phase II (April 1-June 30, 2000) included design validation AR-Lean tests (Task 2.6) in the 10 x 10{sup 6} Btu/hr Tower Furnace. The objective of tests was to determine the efficiency of AR-Lean at higher than … more
Date: June 30, 2000
Creator: Zamansky, Vladimir
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fast Curing of Composite Wood Products

Description: The overall objective of this program is to develop low temperature curing technologies for UF and PF resins. This will be accomplished by: • Identifying the rate limiting UF and PF curing reactions for current market resins; • Developing new catalysts to accelerate curing reactions at reduced press temperatures and times. In summary, these new curing technologies will improve the strength properties of the composite wood products and minimize the detrimental effects of wood extractives on the … more
Date: April 26, 2006
Creator: Ragauskas, Dr. Arthur J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Second Generation Advanced Reburning for High Efficiency NOx Control

Description: This project is designed to develop a family of novel NO{sub x} control technologies, called Second Generation Advanced Reburning (SGAR) which has the potential to achieve 90+% NO{sub x} control in coal-fired boilers at a significantly lower cost than SCR. The twelfth reporting period in Phase II (July 3-October 15, 2000) included design validation AR-Lean tests (Task No.2.6) in the 10 x 10{sup 6} Btu/hr Tower Furnace. The objective of tests was to determine the efficiency of AR-Lean at higher … more
Date: September 30, 2000
Creator: Payne, Roy; Swanson, Lary; Marquez, Antonio; Chang, Ary; Zamansky, Vladimir M.; Maly, Pete M. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Advanced CIDI Emission Control System Development

Description: Ford Motor Company, with ExxonMobil and FEV, participated in the Department of Energy's (DOE) Ultra-Clean Transportation Fuels Program with the goal to develop an innovative emission control system for light-duty diesel vehicles. The focus on diesel engine emissions was a direct result of the improved volumetric fuel economy (up to 50%) and lower CO2 emissions (up to 25%) over comparable gasoline engines shown in Europe. Selective Catalytic Reduction (SCR) with aqueous urea as the NOx reductant… more
Date: May 31, 2006
Creator: Lambert, Christine
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Discovery of New NOx Reduction Catalysts for CIDI Engines Using Combinatorial Techniques

Description: This project for the discovery of new lean reduction NOx catalysts was initiated on August 16th, 2002 and is now into its fourth year. Several materials have already been identified as NOx reduction catalysts for possible future application. NOx reduction catalysts are a critical need in the North American vehicle market since these catalysts are needed to enable both diesels and lean gasoline engines to meet the 2007-2010 emission standards. Hydrocarbon selective catalytic reduction (SCR) is a… more
Date: August 15, 2005
Creator: Blint, Richard J
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Low Emissions Aftertreatment and Diesel Emissions Reduction

Description: Detroit Diesel Corporation (DDC) has successfully completed a five-year Low Emissions Aftertreatment and Diesel Emissions Reduction (LEADER) program under a DOE project entitled: ''Research and Development for Compression-Ignition Direct-Injection Engines (CIDI) and Aftertreatment Sub-Systems''. The objectives of the LEADER Program were to: Demonstrate technologies that will achieve future federal Tier 2 emissions targets; and Demonstrate production-viable technical targets for engine out emiss… more
Date: May 27, 2005
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Production of Depleted UO<sub>2</sub>Kernels for the Advanced Gas-Cooled Reactor Program for Use in TRISO Coating Development

Description: The main objective of the Depleted UO{sub 2} Kernels Production Task at Oak Ridge National Laboratory (ORNL) was to conduct two small-scale production campaigns to produce 2 kg of UO{sub 2} kernels with diameters of 500 {+-} 20 {micro}m and 3.5 kg of UO{sub 2} kernels with diameters of 350 {+-} 10 {micro}m for the U.S. Department of Energy Advanced Fuel Cycle Initiative Program. The final acceptance requirements for the UO{sub 2} kernels are provided in the first section of this report. The ker… more
Date: December 2, 2004
Creator: Collins, J. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Bioremediation of Petroleum Hydrocarbon Contaminated Sites

Description: Bioremediation has been widely applied in the restoration of petroleum hydrocarbon-contaminated. Parameters that may affect the rate and efficiency of biodegradation include temperature, moisture, salinity, nutrient availability, microbial species, and type and concentration of contaminants. Other factors can also affect the success of the bioremediation treatment of contaminants, such as climatic conditions, soil type, soil permeability, contaminant distribution and concentration, and drainage… more
Date: March 30, 2009
Creator: Fallgren, Paul
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Adaptation of the Biolog Phenotype MicroArrayTM Technology to Profile the Obligate Anaerobe Geobacter metallireducens

Description: The Biolog OmniLog? Phenotype MicroArray (PM) plate technology was successfully adapted to generate a select phenotypic profile of the strict anaerobe Geobacter metallireducens (G.m.). The profile generated for G.m. provides insight into the chemical sensitivity of the organism as well as some of its metabolic capabilities when grown with a basal medium containing acetate and Fe(III). The PM technology was developed for aerobic organisms. The reduction of a tetrazolium dye by the test organism … more
Date: May 17, 2010
Creator: Joyner, Dominique; Fortney, Julian; Chakraborty, Romy & Hazen, Terry
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen