Resource Type
Partner
Collection
Office of Scientific & Technical Information Technical Reports
7,128
Congressional Research Service Reports
156
Texas State Publications
104
Texas State Auditor's Office: Reports
60
Technical Report Archive and Image Library
39
D. Jack Davis Art Education Collection
12
End of Term Publications
8
DART Historical Archive
2
UNT Scholarly Works
2
Docs In The News
1
5 More
Serial/Series Title
Fiscal Year 1996
39
Fiscal Year 1995
28
United States Geological Survey Reports
19
Texas Motor Vehicle Traffic Accident Summaries
18
Fiscal Year 1997
14
Report of investigations (United States. Bureau of Mines)
14
United States Bureau of Mines Reports
14
U.S. Geological Survey bulletin
13
Texas Real Estate Center Trends
11
Construction Report
10
86 More
States
Year
Month
Language
Results:
1 - 24 of
7,513
next
An 800-MeV proton beam spill calculation
Using LAHET, the Los Alamos High-Energy Transport code, the authors calculated the radiation hazard from an 800-MeV proton beam spill at the bending magnet. Neutron doses were calculated at an area above the 84.0-cm-thick concrete roof, where there existed a gap with only 30.48-cm concrete shielding. The authors also studied the effect of the gap and proposed a corrective action.
Date:
December 31, 1996
Creator:
Hsu, H. H.; Duran, M. A. & Walker, L. S.
System:
The UNT Digital Library
1996 Department of Energy pre-freshman enrichment program at GMI Engineering and Management Institute, Flint, MI
This document reports on a summer program to encourage students to pursue scientific or engineering professions. The topics of the report include a description of the recruitment program, selection criteria for participants, workshops, nine follow up activities, research projects and student`s presentation, and field trips. Course descriptions and schedule are included as appendices.
Date:
December 31, 1996
Creator:
unknown
System:
The UNT Digital Library
1996 environmental monitoring report for the Naval Reactors Facility
The results of the radiological and nonradiological environmental monitoring programs for 1996 at the Naval Reactors Facility (NRF) are presented in this report. The NRF is located on the Idaho National Engineering and Environmental Laboratory and contains three naval reactor prototypes and the Expended Core Facility, which examines developmental nuclear fuel material samples, spent naval fuel, and irradiated reactor plant components/materials. The results obtained from the environmental monitoring programs verify that releases to the environment from operations at NRF were in accordance with state and federal regulations. Evaluation of the environmental data confirms that the operation of NRF continues to have no adverse effect on the quality of the environment or the health and safety of the general public. Furthermore, a conservative assessment of radiation exposure to the general public as a result of NRF operations demonstrated that the dose received by any member of the public was well below the most restrictive dose limits prescribed by the Environmental Protection Agency (EPA) and the Department of Energy (DOE).
Date:
December 31, 1996
Creator:
unknown
System:
The UNT Digital Library
ABB`s LEBS activities -- A status report
ABB Combustion Engineering, Inc. is one of three contractors executing Phases 1, 2 and 3 of the Department of Energy project entitled Engineering Development of Advanced Coal-Fired Low-Emission Boiler Systems (LEBS). Phase 1 has been completed and Phase 2 is scheduled for completion on September 30, 1996. The following major activities are being carried out in parallel in Phase 2 and this paper is a status report on this work: (1) in-furnace NOx reduction; (2) catalytic filter optimization; (3) add Kalina cycle to POCTF; and (4) POCTF design and licensing. The in-furnace NOx reduction work has been completed and, therefore, a description of this work comprises the major part of this paper.
Date:
December 31, 1996
Creator:
Regan, John W.; vonHein, Robert J.; Peletz, Lawrence J., Jr.; Wesnor, James D. & Bender, David J.
System:
The UNT Digital Library
Acid-base properties, deactivation, and in situ regeneration of condensation catalysts for synthesis of methyl methacrylate
Condensation reaction of a propionate with formaldehyde is a novel route for synthesis of methyl methacrylate (MMA). The reaction mechanism involves a proton abstraction from the propionate on the basic sites and activation of the aliphatic aldehyde on the acidic sites of the catalyst. The acid-base properties of ternary V-Si-P oxide catalysts and their relation to the NWA yield in the vapor phase condensation of formaldehyde with propionic anhydride has been studied for the first time. Five different V-Si-P catalysts with different atomic ratios of vanadium, silicon, and phosphorous were synthesized, characterized, and tested in a fixed-bed microreactor system. A V-Si-P 1:10:2.8 catalyst gave the maximum condensation yield of 56% based on HCHO fed at 300{degrees}C and 2 atm and at a space velocity of 290 cc/g cat{center_dot}h. A parameter called the ``q-ratio`` has been defined to correlate the condensation yields to the acid-base properties. The correlation of q-ratio with the condensation yield shows that higher q-ratios are more desirable. The long-term deactivation studies on the V-Si-P 1: 10:2.8 catalyst at 300{degrees}C and 2 atm and at a space velocity of 290 cc/g cat{center_dot}h show that the catalyst activity drops by a factor of nearly 20 over a 180 h …
Date:
December 31, 1996
Creator:
Gogate, M. R.; Spivey, J. J. & Zoeller, J. R.
System:
The UNT Digital Library
Acid mine drainage prevention, control and treatment technology development for the Stockett/Sand Coulee area. Topical report, March 1, 1995--March 31, 1996
The project was initiated to assist the State of Montana to develop a methodology to ameliorate acid mine drainage problems associated with the abandoned mines located in the Stockett/Sand Coulee area near Great Falls, Montana. Extremely acidic water is continuously discharging from abandoned coal mines in the Stockett/Sand Coulee area at an estimated rate of greater than 600 acre-feet per year (about 350 to 400 gallons per minute). Due to its extreme acidity, the water is unusable and is contaminating other water supplies. Most of the local alluvial aquifers have been contaminated, and nearly 5% of the private wells that were tested in the area during the mid-1980`s showed some degree of contamination. Significant government money has been spent replacing water supplies due to the magnitude of this problem. In addition, millions of dollars have been spent trying to remediate acid mine drainage occurring in this coal field. To date, the techniques used have focused on the management and containment of mine waters, rather than designing technologies that would prevent the formation of acid mine drainage.
Date:
December 31, 1996
Creator:
Brown, T.
System:
The UNT Digital Library
Active in-core irradiation of SiC JFETs at 300 C in a TRIGA nuclear reactor
In this paper the authors demonstrate that SiC transistors have the potential to operate in the severe high temperature and radiation environments of commercial and space nuclear power sources. 6H-SiC FETs were exposed to neutron fluxes and gamma dose rates as high as 1.6 {times} 10{sup 12} n/cm{sup 2}/sec and 3.8 {times} 10{sup 4} rad(Si)/sec while they were maintained under bias at both 300 C and room temperature within the core of a TRIGA reactor operated at 200 kW power level. The radiation exposure was continuous and the bias on the devices was interrupted only to record the current-voltage characteristics at various accumulated neutron fluences from 10{sup 13} to 5 {times} 10{sup 15} n/cm{sup 2}. No significant degradation in the device characteristics was observed until the total neutron fluence exceeded 10{sup 15} n/cm{sup 2} for irradiation at 25 C, and no significant changes were observed even at 5 {times} 10{sup 15} n/cm{sup 2} at 300 C.
Date:
December 31, 1996
Creator:
McGarrity, J.; Scozzie, C.; Blackburn, J. & DeLancey, M.
System:
The UNT Digital Library
Advance concepts for the conversion of syngas liquids. Quarterly report no. 6, January 1--March 31, 1996
Research activities for the period January 1, 1995 to March 31, 1996 have been focused on the characterization of catalyst samples, mainly by Diffuse Reflectance Infrared Spectroscopic Techniques. These studies revealed the strong presence of hydroxyls in our synthetic metal substituted aluminophosphate (MeAPO-36) samples, the amount of which appear to vary depending on the type of metal in the framework. In this report, cases of magnesium, cobalt and manganese are highlighted and compared. The hydroxyl groups present in these samples also shows some interaction with basic probe molecules such as ammonia. Details studies are in progress.
Date:
December 31, 1996
Creator:
Szostak, R. & Ingram, C.
System:
The UNT Digital Library
Advanced combustor design concepts to control NO{sub x} and air toxics. Quarterly progress report, October--December 1996
Direct coal combustion must be a primary energy source for the electric utility industry and for heavy manufacturing during the next several decades because of the availability and economic advantage of coal relative to other fuels and because of the time required to produce major market penetration in the energy field. However, the major obstacle to coal utilization is a set of ever-tightening environmental regulations at both the federal and local levels. It is, therefore, critical that fundamental research be conducted to support the development of low-emission, high efficiency pulverized coal power systems.
Date:
December 31, 1996
Creator:
Pershing, D.W.; Lighty, J.; Spinti, J. & Veranth, J.
System:
The UNT Digital Library
Advanced emissions control development program. Quarterly technical progress report No. 9, October 1--December 31, 1996
Babcock & Wilcox (B&W) is conducting a five-year project aimed at the development of practical, cost-effective strategies for reducing the emissions of hazardous air pollutants (commonly called air toxics) from coal-fired electric utility plants. The need for air toxic emissions controls may arise as the U.S. Environmental Protection Agency proceeds with implementation of Title III of the Clean Air Act Amendment of 1990. Data generated during the program will provide utilities with the technical and economic information necessary to reliably evaluate various air toxics emission compliance options such as fuel switching, coal cleaning, and flue gas treatment. The development work is being carried out using B&W`s new Clean Environment Development Facility (CEDF) wherein air toxics emission control strategies can be developed under controlled conditions, and with proven predictability to commercial systems. Tests conducted in the CEDF provide high quality, repeatable, comparable data over a wide range of coal properties, operating conditions, and emissions control systems. Development work to date has concentrated on the capture of mercury, other trace metals, fine particulate, and the inorganic species hydrogen chloride and hydrogen fluoride.
Date:
December 31, 1996
Creator:
Evans, A.P.
System:
The UNT Digital Library
Advanced Emissions Control Development Program. Quarterly Technical Progress Report {number_sign}6 for the period: January 1 to March 31, 1996
Babcock {ampersand} Wilcox (B{ampersand}W) is conducting a five-year project aimed at the development of practical, cost-effective strategies for reducing the emissions of hazardous air pollutants (commonly called air toxics) from coal-fired electric utility plants. The need for air toxic emissions controls will likely arise as the U. S. Environmental Protection Agency proceeds with implementation of Title III of the clean Air Act Amendments of 1990. Data generated during the program will provide utilities with the technical and economic information necessary to reliably evaluate various air toxics emissions compliance options such as fuel switching, coal cleaning, and flue gas treatment. The development work is being carried out using B{ampersand}W`s new Clean Environment Development Facility (CEDF) wherein air toxics emissions control strategies can be developed under controlled conditions, and with proven predictability to commercial systems. Tests conducted in the CEDF will provide high quality, repeatable, comparable data over a wide range of coal properties, operating conditions, and emissions control systems. The specific objectives of the project are to: (1) measure and understand the production and partitioning of air toxics species for a variety of steam coals, (2) optimize the air toxics removal performance of conventional flue gas cleanup systems (ESPs, baghouses, scrubbers), …
Date:
December 31, 1996
Creator:
Farthing, George A.
System:
The UNT Digital Library
Advanced emissions control development program. Quarterly technical progress report {number_sign}8, July 1--September 30, 1996
The objective of this project is to develop practical strategies and systems for the simultaneous control of SO{sub 2}, NO{sub x}, particulate matter, and air toxics emissions from coal-fired boilers in such a way as to keep coal economically and environmentally competitive as a utility boiler fuel. Of particular interest is the control of air toxics emissions through the cost-effective use of conventional flue gas clean-up equipment such as electrostatic precipitators (ESP`s), fabric filters (baghouses), and SO{sub 2} removal systems such as wet scrubbers and various clean coal technologies. This objective will be achieved through extensive development testing in Babcock and Wilcox`s state-of-the-art, 10 MW{sub e} equivalent, Clean Environment Development Facility (CEDF). The project has extended the capabilities of the CEDF to facilitate air toxics emissions control development work on backend flue gas cleanup equipment. Specifically, an ESP, a baghouse, and a wet scrubber for SO{sub 2} (and air toxics) control were added--all designed to yield air toxics emissions data under controlled conditions, and with proven predictability to commercial systems. The specific objectives of the project are to: measure and understand production and partitioning of air toxics species in coal-fired power plant systems; optimize the air toxics removal performance of …
Date:
December 31, 1996
Creator:
Evans, A.P.
System:
The UNT Digital Library
Advanced hot-gas filter development. Topical report, September 30, 1994--May 31, 1996
The application of high-performance, high-temperature particulate control devices is considered to be beneficial to advanced fossil fuel processing technology, to selected high-temperature industrial processes, and to waste incineration concepts. Ceramic rigid filters represent the most attractive technology for these applications due to their capability to withstand high-temperature corrosive environments. However, current generation monolithic filters have demonstrated poor resistance to crack propagation and can experience catastrophic failure during use. To address this problem, ceramic fiber-reinforced ceramic matrix composite (CMC) filter materials are needed for reliable damage tolerant candle filters. This program is focused on the development of an oxide-fiber reinforced oxide material composite filter material that is cost competitive with prototype next generation filters. This goal would be achieved through the development of a low cost sol-gel fabrication process and a three-dimensional fiber architecture optimized for high volume filter manufacturing. The 3D continuous fiber reinforcement provides a damage tolerant structure which is not subject to delamination-type failures. This report documents the Phase 1, Filter Material Development and Evaluation, results. Section 2 provides a program summary. Technical results, including experimental procedures, are presented and discussed in Section 3. Section 4 and 5 provide the Phase 1 conclusions and recommendations, respectively. The remaining …
Date:
December 31, 1996
Creator:
Lane, J. E.; LeCostaouec, J. F.; Painter, C. J.; Sue, W. A. & Radford, K. C.
System:
The UNT Digital Library
Advanced light water reactor plants System 80+{trademark} design certification program. Annual progress report, October 1, 1995--September 30, 1996
The purpose of this report is to provide a status of the progress that was made towards Design Certification of System 80+{trademark} during the US government`s 1996 fiscal year. The System 80+ Advanced Light Water Reactor (ALWR) is a 3931 MW (1350 MWe) Pressurized Water Reactor (PWR). The design covers an essentially complete plant. It is based on EPRI ALWR Utility Requirements Document (URD) improvements to the Standardized System 80 Nuclear Steam Supply System (NSSS) in operation at Palo Verde Units 1, 2 and 3. The NSSS is a traditional two-loop arrangement with two steam generators, two hot legs and four cold legs, each with a reactor coolant pump. The System 80+ standard design houses the NSSS in a spherical steel containment vessel which is enclosed in a concrete shield building, thus providing the safety advantages of a dual barrier to radioactivity release. Other major features include an all-digital, human-factors-engineered control room, an alternate electrical AC power source, an In-Containment Refueling Water Storage Tank (IRWST), and plant arrangements providing complete separation of redundant trains in safety systems.
Date:
December 31, 1996
Creator:
unknown
System:
The UNT Digital Library
Advanced oxidation technologies for chemical demilitarization
This is the final report of a one-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory. The main project objective was to establish a technical basis for future program development in the area of chemical warfare agent destruction using a Los Alamos-developed advanced oxidation process: a two-stage device consisting of thermal packed-bed reactor (PBR) and a nonthermal plasma (NTP) reactor. Various compounds were evaluated as potential surrogates for chemical warfare (CW) agents. Representative effluent mass balances were projected for future comparisons with incinerators. The design and construction of lab-scale PBR/NTP reactors (consisting of a liquid injection and metering system, electric furnace, condensers, chemical traps, plasma reactors, power supplies, and chemical diagnostics) has been completed. This equipment, the experience gained from chemical-processing experiments, process modeling, and an initial demonstration of the feasibility of closed-loop operation, have provided a technical basis for further demonstrations and program development efforts.
Date:
December 31, 1996
Creator:
Rosocha, L. A.; Korzekwa, R. A.; Monagle, M.; Coogan, J. J.; Tennant, R. A.; Brown, L. F. et al.
System:
The UNT Digital Library
Advanced reservoir characterization in the Antelope Shale to establish the viability of CO{sub 2} enhanced oil recovery in California`s Monterey Formation siliceous shales. Quarterly report, October 1, 1996--December 31, 1996
The primary objective of this research is to conduct advanced reservoir characterization and modeling studies in the Antelope Shale reservoir. Characterization studies will be used to determine the technical feasibility of implementing a CO{sub 2} enhanced oil recovery project in the Antelope Shale in Buena Vista Hills field. The Buena Vista Hills pilot CO{sub 2} project will demonstrate the economic viability and widespread applicability of CO{sub 2} flooding in fractured siliceous shales reservoirs of the San Joaquin Valley. The research consists of four primary work processes: reservoir matrix and fluid characterization: fracture characterization; reservoir modeling and simulation; and, CO{sub 2} pilot flood and evaluation. Work done in these areas is subdivided into two phases or budget periods. The first phase of the project will focus on the application of a variety of advanced reservoir characterization techniques to determine the production characteristics of the Antelope Shale reservoir. Reservoir models based on the results of the characterization work will be used to evaluate how the reservoir will respond to secondary recovery and EOR processes. The second phase of the project will include the implementation and evaluation of an advanced enhanced oil recovery pilot in the West Dome of the Buena Vista Hills …
Date:
December 31, 1996
Creator:
Toronyi, R. M.
System:
The UNT Digital Library
Advanced Sulfur Control Concepts for Hot-Gas Desulfurization Technology. Quarterly Report, July 1 - September 30, 1996
The primary objective is to determine the feasibility of an alternate concept for the regeneration of high temperature desulfurization sorbents in which elemental sulfur, instead of SO{sub 2} is produced. Iron and cerium-based sorbents were chosen on the basis of thermodynamic analysis to determine the feasibility of elemental sulfur production. Experimental effort on the regeneration of FeS using the partial oxidation concept was completed during the quarter, and attention returned to the sulfidation of CeO{sub 2} and regeneration of Ce{sub 2}O{sub 2}2S. Progress was made in the process simulation effort involving two-step desulfurization using CeO{sub 2} to remove the bulk of the H{sub 2}S followed by a zinc-titanate polishing step. The simulation effort includes regeneration of Ce{sub 2}O{sub 2}S using two concepts - reaction with SO{sub 2} reaction with H{sub 2}O. Elemental sulfur is formed directly in the reaction with SO{sub 2} while H{sub 2}S is the product of the regeneration reaction with steam. Steam regeneration is followed by a Claus process to convert the H{sub 2}S to elemental sulfur. The last test involving partial oxidation regeneration of FeS was completed in early July. Experimental problems were encountered throughout this phase of the program, primarily associated with erratic readings from …
Date:
December 31, 1996
Creator:
unknown
System:
The UNT Digital Library
Advanced Sulfur Control Processing
The primary objective of this project is to determine the feasibility of an alternate concept for the regeneration of high temperature desulfurization sorbents in which elemental sulfur, instead of SO{sub 2}, is produced. If successful, this concept will eliminate or alleviate problems caused by the highly exothermic nature of the regeneration reaction, the tendency for metal sulfate formation, and the need to treat the regeneration off-gas to prevent atmospheric SO{sub 2}, emissions. Iron and cerium-based sorbents were chosen on the basis of thermodynamic analysis to determine the feasibility of elemental sulfur production. The ability of both to remove H{sub 2}S during the sulfidation phase is less than that of zinc-based sorbents, and a two-stage desulfurization process will likely be required. Preliminary experimental work used electrobalance reactors to compare the relative rates of reaction of O{sub 2} and H{sub 2}O with FeS. More detailed studies of the regeneration of FeS as well as the sulfidation of CeO{sub 2} and regeneration of Ce{sub 2}O{sub 2}S are being carried out in a laboratory-scale fixed-bed reactor equipped with a unique analytical system which permits semi-continuous analysis of the distribution of elemental sulfur, H{sub 2}S, and SO{sub 2} in the reaction product gas.
Date:
December 31, 1996
Creator:
Gangwal, S.K.; Portzer, J.W.; Turk, B.S. & Gupta, R.
System:
The UNT Digital Library
Advanced Turbine Systems Program: Conceptual design and product development
Objective is to provide the conceptual design and product development plant for an ultra high efficiency, environmentally superior, and cost competitive industrial gas turbine system to be commercialized by the year 2000 (secondary objective is to begin early development of technologies critical to the success of ATS). This report addresses the remaining 7 of the 9 subtasks in Task 8, Design and Test of Critical Components: catalytic combustion, recuperator, high- temperature turbine disc, advanced control system, and ceramic materials.
Date:
December 31, 1996
Creator:
unknown
System:
The UNT Digital Library
Advanced turbine systems program. Final report, August 3, 1993--August 31, 1996
Six tasks were approved under the Advanced Turbine Systems (ATS) extension program. The six tasks include the following: Task 5.0 -- Market Study. The objective of the market study task is to focus on distributed generation prospects for an industrial ATS, using the Allison ATS family as the primary gas turbine systems. Task 6.0 -- Gas Fired Advanced Turbine System (GFATS) Definition and Analysis. Task 8.01 -- Castcool{reg_sign} Blades Fabrication Process Development. Task 8.04 -- ATS Low Emission Combustion System. Task 8.07 -- Ceramic Vane Design and Evaluation. Task 9.0 -- Program Management. Each of these tasks is described, progress is discussed, and results are given.
Date:
December 31, 1996
Creator:
unknown
System:
The UNT Digital Library
Advanced turbine systems program. Quarterly report, February 1--April 30, 1996
Allison continued progress on the following tasks during this quarter: (distributed generation) market study, GFATS system definition and analysis, Castcool{trademark} blade technology demonstration, low emissions combustion system, ceramic vane design and evaluation, and program management.
Date:
December 31, 1996
Creator:
unknown
System:
The UNT Digital Library
Advanced Turbine Systems program. Quarterly report, November 1, 1995--January 31, 1996
Allison continued progress on the following tasks during this quarter: Task 5: market study; Task 6: GFATS system definition and analysis; Task 8.01: Castcool{trademark} technology demonstration; Task 8.04: low emissions combustion system; Task 8.07: ceramic vane design and evaluation; and Task 9.0: program management.
Date:
December 31, 1996
Creator:
unknown
System:
The UNT Digital Library
Advances in Ammonia Removal from Hot Coal Gas
Nitrogen occurs in coal in the form of tightly bound organic ring compounds, typically at levels of 1 to 2 wt%. During coal gasification, this fuel bound nitrogen is released principally as ammonia (NH{sub 3}). When hot coal gas is used to generate electricity in integrated gasification combined cycle (IGCC) power plants, NH{sub 3} is converted to nitrogen oxides (NO{sub x}) which are difficult to remove and are highly undesirable as atmospheric pollutants. Similarly, while the efficiency of integrated gasification molten carbonate fuel cell (IGFC) power plants is not affected by NH{sub 3}, NO{sub x} is generated during combustion of the anode exhaust gas. Thus NH{sub 3} must be removed from hot coal gas before it can be burned in a turbine or fuel cell. The objective of this study is to develop a successful combination of an NH{sub 3} decomposition catalyst with a zinc-based mixed-metal oxide sorbent so that the sorbent-catalyst activity remains stable for NH{sub 3} decomposition in addition to H{sub 2}S removal under cycle sulfidation-regeneration conditions in the temperature range of 500 to 750{degrees}C.
Date:
December 31, 1996
Creator:
Jothimurugesan, K. & Gangwal, S. K.
System:
The UNT Digital Library
Advances in defect characterizations of semiconductors using positrons
Positron Annihilation Spectroscopy (PAS) is a sensitive probe for studying the electronic structure of defects in solids. The authors summarize recent developments in defect characterization of semiconductors using depth-resolved PAS. The progress achieved in extending the capabilities of the PAS method is also described.
Date:
December 31, 1996
Creator:
Lynn, K.G. & Asoka-Kumar, P.
System:
The UNT Digital Library