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87,545 Matching Results

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Best Match Title Creator Date Created (Newest) Date Created (Oldest) Date Added (Newest) Date Added (Oldest)
Heavy metal contamination in TIMS Branch sediments (open access)

Heavy metal contamination in TIMS Branch sediments

The objective of this memorandum is to summarize results of previous sediment studies on Tims Branch and Steed's Pond conducted by Health Protection (HP) and by the Savannah River Laboratory (SRL) in conjunction with Reactor Materials Engineering Technology (RMET). The results for other heavy metals, such as lead, nickel, copper, mercury, chromium, cadmium, zinc, and thorium are also summarized.
Date: June 25, 1990
Creator: Pickett, J.B.
Object Type: Report
System: The UNT Digital Library
Status report: waste incineration and fixation for Waste Management, Production, and Reprocessing Division of the Department of Energy (July--December 1976) (open access)

Status report: waste incineration and fixation for Waste Management, Production, and Reprocessing Division of the Department of Energy (July--December 1976)

Fluidized bed incineration and waste fixation processes are being used to process the types of wastes expected from nuclear fuel reprocessing and production plants. Test incineration runs have been made on two types of wastes: high efficiency particulate air (HEPA) filters and tributyl phosphate-solvent solutions. Laboratory-scale vitrification equipment was used to produce glass pellets from incinerator ash and blends of other expected waste streams. Computer modeling gave an expected product integrity life of over 2,000 years.
Date: November 25, 1977
Creator: Ziegler, D. L.; White, J. W.; Johnson, A. J.; Fong, L. Q.; Teter, A. R. & Chung, S. F.
Object Type: Report
System: The UNT Digital Library
Measurement and Modeling of Advanced Coal Conversion Processes (open access)

Measurement and Modeling of Advanced Coal Conversion Processes

The objectives of this study are to establish the mechanisms and rates of basic steps in coal conversion processes, to integrate and incorporate this information into comprehensive computer models for coal conversion processes, to evaluate these models and to apply them to gasification, mild gasification and combustion in heat engines. (VC)
Date: September 25, 1991
Creator: Solomon, P. R.; Serio, M. A.; Hamblen, D. G.; Smoot, L. D. & Brewster, B. S.
Object Type: Report
System: The UNT Digital Library
Evaluation of cracking in feedwater piping adjacent to the steam generators in Nine Pressurized Water Reactor Plants (open access)

Evaluation of cracking in feedwater piping adjacent to the steam generators in Nine Pressurized Water Reactor Plants

Cracking in ASTM A106-B and A106-C feedwater piping was detected near the inlet to the steam generators in a number of pressurized water reactor plants. We received sections with cracks from nine of the plants with the objective of identifying the cracking mechanism and assessing various factors that might contribute to this cracking. Variations were observed in piping surface irregularities, corrosion-product, pit, and crack morphology, surface elmental and crystal structure analyses, and steel microstructures and mechanical properties. However, with but two exceptions, namely, arrest bands and major surface irregularities, we were unable to relate the extent of cracking to any of these factors. Tensile and fracture toughness (J/sub Ic/ and tearing modulus) properties were measured over a range of temperatures and strain rates. No unusual properties or microstructures were observed that could be related to the cracking problem. All crack surfaces contained thick oxide deposits and showed evidence of cyclic events in the form of arrest bands. Transmission electron microscopy revealed fatigue striations on replicas of cleaned crack surfaces from one plant and possibly from three others. Calculations based on the observed striation spacings gave a value of ..delta..sigma = 150 MPa (22 ksi) for one of the major cracks. …
Date: June 25, 1980
Creator: Goldberg, A.; Streit, R. D. & Scott, R. G.
Object Type: Report
System: The UNT Digital Library
Quadric solids and computational geometry (open access)

Quadric solids and computational geometry

As part of the CAD-CAM development project, this report discusses the mathematics underlying the program QUADRIC, which does computations on objects modeled as Boolean combinations of quadric half-spaces. Topics considered include projective space, quadric surfaces, polars, affine transformations, the construction of solids, shaded image, the inertia tensor, moments, volume, surface integrals, Monte Carlo integration, and stratified sampling. 1 figure.
Date: July 25, 1980
Creator: Emery, J.D.
Object Type: Report
System: The UNT Digital Library
Numerical simulation of the stability in a cable-in-conduit conductor developed for fusion-magnet applications (open access)

Numerical simulation of the stability in a cable-in-conduit conductor developed for fusion-magnet applications

The stability margins of the US-Demonstration Poloidal Coil (US-DPC) and the International Thermonuclear Experimental Reactor (ITER) TF coils have been modeled numerically using the computer program CICC. The computed US-DPC limiting current, I{sub lim}, compares favorably with the values determined experimentally. Using the detailed program CICC output, we investigated the DPC quench initiation mechanism in each of the three stability regions. In the ill-cooled region, the imposed heat pulse heats the conductor to the current-sharing temperature, T{sub cs}. In the transition region, the resistance heating after the pulse must be strong enough to overcome the induced flow reversal. In the well-cooled region, good heat transfer heats the helium during the pulse. After the pulse, these high helium temperatures along with poor heat transfer cause the conductor to quench. Changes in I{sub lim} agree with Dresner's relationship. I{sub lim} can be improved by decreasing the copper resistivity, the helium fraction, or the conductor diameter. Preliminary results show the ITER and TF coil operating point is in the well-cooled region. 10 refs., 7 figs., 1 tab.
Date: September 25, 1991
Creator: Wong, R.L.; Shen, S.S. (Lawrence Livermore National Lab., CA (United States)); Yeaw, C.T. (Wisconsin Univ., Madison, WI (United States)) & Miller, J.R. (National High Magnetic Field Laboratory, Florida State University (USA))
Object Type: Article
System: The UNT Digital Library
Time-dependent properties of fiber composites for energy-storage flywheels (open access)

Time-dependent properties of fiber composites for energy-storage flywheels

Time-dependent deformation and time-dependent strength are being characterized for several candidate polymeric composites for flywheels. This presentation highlights the motivation and the philosophy of the characterization adopted by the authors in establishing the ongoing programs at LLL. This overview is intended to provide a basis for inferring the type of enginering data being generated for different aspects of flywheel design. The details of these data can be obtained from the published reports and articles. Two aspects of flywheel design data are addressed: those dealing with time-dependent statistical strength, and those dealing with deformation and strength under time-varying history.
Date: October 25, 1977
Creator: Wu, E.M. & Penn, L.S.
Object Type: Article
System: The UNT Digital Library
Tritium experience at RTNS-II (open access)

Tritium experience at RTNS-II

Neutrons are produced at the Rotating Target Neutron Source-II (RTNS-II) by deuteron bombardment of a rotating tritium target. Tritium is released from these targets into the accelerator vacuum system. The vacuum system exhaust is first scrubbed and then vented via the facility stack. Tritium emission from the facility in normal operation with vacuum system exhaust flowing through the scrubber is extremely low, <1 mCi/day. Releases from by-passing the tritium scrubber during roughing of the vacuum system and from accelerator maintenance account for nearly all of the annual 10 Ci release from the facility. Routine target changes have been the cause of most tritium uptake by personnel. A target shipping system has been devised for transport of these targets.
Date: April 25, 1980
Creator: Logan, C. M.; Davis, J. C.; Gibson, T. A.; Heikkinen, D. W.; Schumacher, B. J. & Singh, M. S.
Object Type: Article
System: The UNT Digital Library
Production of muons for fusion catalysis in a magnetic mirror configuration. Revision 1 (open access)

Production of muons for fusion catalysis in a magnetic mirror configuration. Revision 1

For muon-catalyzed fusion to be of practical interest, a very efficient means of producing muons must be found. We describe a scheme for producing muons that may be more energy efficient than any heretofore proposed. There are, in particular, some potential advantages of creating muons from collisions of high energy tritons confined in a magnetic mirror configuration. If one could catalyze 200 fusions per muon and employ a uranium blanket that would multiply the neutron energy by a factor of 10, one might produce electricity with an overall plant efficiency (ratio of electric energy produced to nuclear energy released) approaching 30%. One possible near term application of a muon-producing magnetic-mirror scheme would be to build a high-flux neutron source for radiation damage studies. The careful arrangement of triton orbits will result in many of the ..pi../sup -/'s being produced near the axis of the magnetic mirror. The pions quickly decay into muons, which are transported into a small (few-cm-diameter) reactor chamber producing approximately 1-MW/m/sup 2/ neutron flux on the chamber walls, using a laboratory accelerator and magnetic mirror. The costs of construction and operation of the triton injection accelerator probably introduces most of the uncertainty in the viability of this …
Date: July 25, 1986
Creator: Moir, R.W. & Chapline, G.F. Jr.
Object Type: Article
System: The UNT Digital Library
Supernovae, compact stars and nuclear physics (open access)

Supernovae, compact stars and nuclear physics

We briefly review the current understanding of supernova. We investigate the implications of rapid rotation corresponding to the frequency of the new pulsar reported in the supernovae remnant SN1987A. It places very stringent conditions on the equation of state if the star is assumed to be bound by gravity alone. We find that the central energy density of the star must be greater than 12 times that of nuclear density to be stable against the most optimistic estimate of general relativistic instabilities. This is too high for the matter to plausibly consist of individual hadrons. We conclude that the newly discovered pulsar, if its half-millisecond signals are attributable to rotation, cannot be a neutron star. We show that it can be a strange quark star, and that the entire family of strange stars can sustain high rotation under appropriate conditions. We discuss the conversion of a neutron star to strange star, the possible existence of a crust of heavy ions held in suspension by centrifugal and electric forces, the cooling and other features. 39 refs., 8 figs., 2 tabs.
Date: August 25, 1989
Creator: Glendenning, N.K.
Object Type: Article
System: The UNT Digital Library
[News Clip: Shepps] captions transcript

[News Clip: Shepps]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: March 25, 1994, 10:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: IRS seizure] captions transcript

[News Clip: IRS seizure]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: March 25, 1994, 5:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Clinton, William Jefferson] captions transcript

[News Clip: Clinton, William Jefferson]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: October 25, 1994, 10:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Standeford] captions transcript

[News Clip: Standeford]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: October 25, 1994, 6:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Tilton] captions transcript

[News Clip: Tilton]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: July 25, 1994, 5:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Carjacking] captions transcript

[News Clip: Carjacking]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: February 25, 1994, 10:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
[News Clip: Minns arraignment] captions transcript

[News Clip: Minns arraignment]

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date: July 25, 1994, 6:00 p.m.
Creator: KXAS-TV (Television station : Fort Worth, Tex.)
Object Type: Video
System: The UNT Digital Library
Current drive and heating systems for an ITER HARD option (open access)

Current drive and heating systems for an ITER HARD option

A conceptual design has been developed for a reference current drive and heating system for a HARD (High Aspect Ratio Design) option for ITER. Twelve neutral beam modules, each rated at 1.3MeV and 9.2MW, perform plasma heating and current drive. An electron cyclotron system is used for initiating the plasma and for disruption control. An alternate system has been defined which is comprised of a lower hybrid and ion cyclotron system for heating and current drive, augmented by the same electron cyclotron system proposed for the reference system. 7 refs., 8 figs., 1 tab.
Date: September 25, 1991
Creator: Lindquist, W.; Bulmer, R.; Fenstermacher, M.; Nevins, W.; Parker, J.; Smith, G. et al.
Object Type: Article
System: The UNT Digital Library
New tools using the hardware performance monitor to help users tune programs on the Cray X-MP (open access)

New tools using the hardware performance monitor to help users tune programs on the Cray X-MP

The performance of a Cray system is highly dependent on the tuning techniques used by individuals on their codes. Many of our users were not taking advantage of the tuning tools that allow them to monitor their own programs by using the Hardware Performance Monitor (HPM). We therefore modified UNICOS to collect HPM data for all processes and to report Mflop ratings based on users, programs, and time used. Our tuning efforts are now being focused on the users and programs that have the best potential for performance improvements. These modifications and some of the more striking performance improvements are described.
Date: September 25, 1991
Creator: Engert, D. E.; Rudsinski, L. (Argonne National Lab., IL (United States)) & Doak, J. (Cray Research, Inc., Minneapolis, MN (United States))
Object Type: Article
System: The UNT Digital Library
Mission analysis and performance specification studies report. Appendix A. [LYFECC and WANDC] (open access)

Mission analysis and performance specification studies report. Appendix A. [LYFECC and WANDC]

The results of Task I, mission analysis and performance specifications, for the Near-Term Hybrid Vehicle (NTHV) development program are presented. The items researched included trip characteristics, market potential, life-cycle cost and performance specifications of NTHV's. (LCL)
Date: January 25, 1979
Creator: unknown
Object Type: Report
System: The UNT Digital Library
An Evaluation of the Krieger-Nelkin Method From Calculations of Slow Neutron Scattering by CH$sub 4$ (open access)

An Evaluation of the Krieger-Nelkin Method From Calculations of Slow Neutron Scattering by CH$sub 4$

None
Date: August 25, 1961
Creator: McMurry, H. L.; Griffing, G. W.; Hestir, W. A. & Gannon, L. J.
Object Type: Report
System: The UNT Digital Library
SPE water electrolysis technology development for large scale hydrogen production. Progress report No. 6, January 1, 1977--March 31, 1977 (open access)

SPE water electrolysis technology development for large scale hydrogen production. Progress report No. 6, January 1, 1977--March 31, 1977

The status of the following studies is reported: low cost current collector development, high temperature operation, catalytic electrode development, low cost polymer development, evaluation of the effect of hydrogen enrichment on older gas pipelines, cell and SPE optimization, cell assembly design, stack assembly design, manufacturing process development, and system analysis and definition.
Date: April 25, 1977
Creator: unknown
Object Type: Report
System: The UNT Digital Library
Proposed geothermal sampler design (open access)

Proposed geothermal sampler design

None
Date: November 25, 1974
Creator: Calder, C.A.; Lord, S.C. & Davis, D.D.
Object Type: Report
System: The UNT Digital Library
Staff management of security personnel at Martin Marietta Energy Systems, Inc. , Portsmouth Gaseous Diffusion Plant (open access)

Staff management of security personnel at Martin Marietta Energy Systems, Inc. , Portsmouth Gaseous Diffusion Plant

The Portsmouth Gaseous Diffusion Plant Security and Police Operations Department is responsible for protecting the US Department of Energy interests at the Portsmouth Plant from theft, sabotage, and other hostile acts that may adversely affect national security, the public health and safety, or property at the Department of Energy facility. This audit's purpose was to evaluate Martin Marietta Energy Systems, Inc.'s staff management at the Portsmouth Plant Security Department. The Portsmouth Plant Security Department could reduce operating cost up to an estimated $4.4 million over 5 years by: (1) Eliminating up to 14 unnecessary staff positions, and (2) reducing the length of relief breaks. These economies could be realized through implementing written operating procedures and negotiating removal of certain labor union restrictions. 2 tabs.
Date: September 25, 1991
Creator: unknown
Object Type: Report
System: The UNT Digital Library