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460
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203
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112
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106
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67
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64
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42
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34
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15,324 Matching Results
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Alcohol and the Older Driver
Report regarding alcohol consumption among the elderly, aged persons driving under the influence of alcohol, and possible side-effects of alcohol.
Date:
1993
Creator:
Dennis, Maurice E.
Object Type:
Report
System:
The Portal to Texas History
The ALEXIS data processing package: An update
The ALEXIS experiment (Array of Low Energy X-ray Imaging Sensors), is a mini-satellite containing six wide angle EUV/ultrasoft x-ray telescopes. Its purpose is to map out the sky in three narrow (5%) bandpasses around 66, 71, and 93 eV. The 66 and 71 eV bandpasses are centered on intense Fe emission lines which are characteristic of million-degree plasmas such as the one thought to produce the soft x-ray background. The 93 eV bandpass is not near any strong emission lines and is more sensitive to continuum sources. The mission will be launched on the Pegasus Air-Launched Vehicle in early 1993 into a 400-nautical-mile, high-inclination orbit and will be controlled entirely from a small ground station located at Los Alamos. The project is a collaborative effort between Los Alamos National Laboratory, Sandia National Laboratory, and the University of California-Berkeley Space Sciences Laboratory.
Date:
January 1, 1993
Creator:
Bloch, J.J.; Smith, B.W. & Edwards, B.C.
Object Type:
Article
System:
The UNT Digital Library
Algorithms for optimal redundancy allocation
Heuristic and exact methods for solving the redundancy allocation problem are compared to an approach based on genetic algorithms. The various methods are applied to the bridge problem, which has been used as a benchmark in earlier work on optimization methods. Comparisons are presented in terms of the best configuration found by each method, and the computation effort which was necessary in order to find it.
Date:
January 1, 1993
Creator:
Vandenkieboom, J. & Youngblood, R.
Object Type:
Article
System:
The UNT Digital Library
Algorithms for optimal redundancy allocation
Heuristic and exact methods for solving the redundancy allocation problem are compared to an approach based on genetic algorithms. The various methods are applied to the bridge problem, which has been used as a benchmark in earlier work on optimization methods. Comparisons are presented in terms of the best configuration found by each method, and the computation effort which was necessary in order to find it.
Date:
January 1, 1993
Creator:
Vandenkieboom, J. & Youngblood, R.
Object Type:
Article
System:
The UNT Digital Library
Aligned, short-fiber composites by novel flow processing methods
A hydrodynamic method has been employed to align short, reinforcing fibers in polymer matrix composite materials. Samples of composite materials were prepared and tested two at a time (one with randomly oriented fibers and the other with aligned fibers) to isolate and directly measure the effect on mechanical properties of aligning the fibers. Data were collected for the ultimate tensile strength, modulus of elasticity, and ultimate tensile strain of the composite samples prepared. Results show that the aligned fibers were approximately twice as effective (as randomly oriented fibers) at stiffening and strengthening the composite in the alignment direction. 5 figs, 20 refs.
Date:
January 1, 1993
Creator:
Guell, D. C.; Graham, A. L.; Papathanasiou, T. & Petrovic, J. J.
Object Type:
Article
System:
The UNT Digital Library
Alternative strategies: A means for saving money and time on the Yucca Mountain Project
The United States Department of Energy (DOE) is undertaking studies to determine the suitability of Yucca Mountain (YM) as a potential site for disposal of high level nuclear waste. Yucca Mountain is located in an arid environment. Many processes that could contribute to mobilization of radionuclides are either absent or minimized in a dry site. Therefore, Yucca Mountain should have the potential of being a veryfavorable site for disposal of waste. The determination of suitability has no precedence, and the characterization of an and site is complex, requiring intensive studies to determine suitability. The studies undertaken by the Yucca Mountain Site Characterization Project (YMP) are very costly. By a process called performance allocation, the YMP determined strategies to satisfy regulations or meet performance while minimizing costs and schedules. Those involved recognized that allocations should be reviewed as additional information became available. The allocation has not been reviewed nor revised since the initial allocation in the Site Characterization Plan (SCP). The purpose of this paper is to outline alternative allocations that the author feels should be considered based on the additional information that is available at this time.
Date:
January 1, 1993
Creator:
Wilder, D. G.
Object Type:
Article
System:
The UNT Digital Library
Amended proposal for R&D on a cluster klystron
This Proposal is an updated version of FWP submitted in March 1992. Significant work has been done since the original proposal, and much of this is reported on in this update. In addition there have been several changes made, some in response to suggestions made by the three reviews sent to us in December, 1992. The new information and changes include: Technical information on the proposed design of the magnetron gun, the magnet, acceleration gap, and electrical system (including a comment on efficiency loss due to high-voltage leakage current). Modification of the phase I and II tests to allow operation of the gun and klystron off the axis of the magnet, thus simulating the magnet situation when multiple beams are used. Modification of phases III and IV to test a cluster of three beams: first a three beam gun, and then three beams with a klystron on one of them. We have added a phase V which would be the testing of a full three-beam demonstration klystron. The mod-anode pulser would now be located on the high voltage deck instead of externally. Power for the pulser and other high voltage components would now be provided by an isolation transformer instead …
Date:
January 1, 1993
Creator:
Fernow, R. C.; Fischer, J.; Gallardo, J. C.; Kirk, H. G.; Ko, S. K.; Palmer, R. B. et al.
Object Type:
Report
System:
The UNT Digital Library
Americans with Disabilities Act in Texas Annual Report: 1994
Annual report of the Texas Governor's Committee on People with Disabilities describing goals, activities, and accomplishments during fiscal year 1994.
Date:
[1993..1994]
Creator:
Texas Governor's Committee on People with Disabilities
Object Type:
Report
System:
The Portal to Texas History
Amistad Village
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:100000
Date:
1993
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
The AMTEX Partnership
The American Textile Partnership, as its name implies, is a collaborative effort between the DOE national labs and industry-related R D/educational institutions. The purpose of AMTEX is to promote R D that enhance the competitiveness of the integrated textile industry (i.e., fibers, textiles, sewn/fabricated products). The industry-related organizations bring a vital perspective of industry needs in addition to their own R D capabilities. The DOE labs bring broad R D capabilities and perspectives from other areas of research application. The strong synergy between industry and DOE will enable this collaboration to significantly impact industry competitiveness while focusing and strengthening, the labs' capabilities consistent with DOE's mission. There are three main components in AMTEX: DOE/ER oversight; the Operating Committee, which is composed a Laboratory Board and an Industry Board; and five Technology Area Coordination Teams (TACTs).
Date:
January 1, 1993
Creator:
Lemon, D.K.
Object Type:
Report
System:
The UNT Digital Library
Anaerobic digestion as a waste disposal option for American Samoa
Tuna sludge and municipal solid waste (MSW) generated on Tutuila Island, American Samoa, represent an ongoing disposal problem as well as an emerging opportunity for use in renewable fuel production. This research project focuses on the biological conversion of the organic fraction of these wastes to useful products including methane and fertilizer-grade residue through anaerobic high solids digestion. In this preliminary study, the anaerobic bioconversion of tuna sludge with MSW appears promising.
Date:
January 1, 1993
Creator:
Rivard, C
Object Type:
Report
System:
The UNT Digital Library
Anahuac Quadrangle
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:24,000
Date:
1993
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
Anahuac Quadrangle
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:24000
Date:
1993
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
Analysis of an MCG/fuse/PFS experiment
The Los Alamos PROCYON high-explosive pulsed power (HEPP) implosion system is intended to produce 1 MJ of soft X-radiation for fusion and material studies. The system uses the MK-IX magnetic flux compression generator to drive a slow'' opening switch which, upon operation, connects the output of the MK-IX generator to a plasma flow switch, which, in turn, delivers current to a rapidly imploding load. The closing switch isolates the plasma flow switch (PFS) and load from any precursor current which might arise due to the finite impedance of the opening switch during its closed phase. In that experiment, our first test, the MK-IX generated approximately 16 MA and 8.2 MJ, and approximately 9.8 MA and 1.15 MJ were delivered to a fixed inductive load in 8--10 microseconds. Computations performed after the experiment, taking into account experimental variables which could not be accurately predicted prior to the experiment, were in satisfactory agreement with all experimental observations, including a double-peaked dI/dt signal which indicated a particular trajectory of the copper fuse material through density-temperature space. Prompted by our success with a fixed load, a second experiment was performed using the MK-IX/fuse/STS combination to drive a plasma flow switch. The objectives of the …
Date:
January 1, 1993
Creator:
Lindemuth, I.R.; Rickel, D.G. & Reinovsky, R.E.
Object Type:
Article
System:
The UNT Digital Library
Analysis of IFR samples at ANL-E
The Analytical Chemistry Laboratory analyzes a variety of samples submitted by the different research groups within IFR. This talk describes the analytical work on samples generated by the Plutonium Electrorefiner, Large Scale Electrorefiner and Waste Treatment Studies. The majority of these samples contain Transuranics and necessitate facilities that safely contain these radioisotopes. Details such as: sample receiving, dissolution techniques, chemical separations, Instrumentation used, reporting of results are discussed. The Importance of Interactions between customer and analytical personnel Is also demonstrated.
Date:
January 1, 1993
Creator:
Bowers, D.L. & Sabau, C.S.
Object Type:
Article
System:
The UNT Digital Library
Analysis of nuclear reactor instability phenomena
The phenomena known as density-wave instability often occurs in phase change systems, such as boiling water nuclear reactors (BWRS). Our current understanding of density-wave oscillations is in fairly good shape for linear phenomena (eg, the onset of instabilities) but is not very advanced for non-linear phenomena [Lahey and Podowski, 1989]. In particular, limit cycle and chaotic instability modes are not well understood in boiling systems such as current and advanced generation BWRs (eg, SBWR). In particular, the SBWR relies on natural circulation and is thus inherently prone to problems with density-wave instabilities. The purpose of this research is to develop a quantitative understanding of nonlinear nuclear-coupled density-wave instability phenomena in BWRS. This research builds on the work of Achard et al [1985] and Clausse et al [1991] who showed, respectively, that Hopf bifurcations and chaotic oscillations may occur in boiling systems.
Date:
January 1, 1993
Creator:
Lahey, R.T. Jr.
Object Type:
Report
System:
The UNT Digital Library
The analysis of repository-heat-driven hydrothermal flow at Yucca Mountain
To safely and permanently store high-level nuclear waste, the potential Yucca Mountain repository site must mitigate the release and transport of radionuclides for tens of thousands of years. In the failure scenario of greatest concern, water would contact the waste package (WP), accelerate its failure rate, and eventually transport radionuclides to the water table. In a concept called the ``extended-dry repository,`` decay heat arising from radioactive waste extends the time before liquid water can contact a WP. Recent modeling and theoretical advances in nonisothermal, multiphase fracture-matrix flow have demonstrated (1) the critical importance of capillary pressure disequilibrium between fracture and matrix flow, and (2) that radioactive decay heat plays a dominant role in the ability of the engineered and natural barriers to contain and isolate radionuclides. Our analyses indicate that the thermo-hydrological performance of both the unsaturated zone (UZ) and saturated zone (SZ) will be dominated by repository-heat-driven hydrothermal flow for tens of thousands of years. For thermal loads resulting in extended-dry repository conditions, UZ performance is primarily sensitive to the thermal properties and thermal loading conditions and much less sensitive to the highly spatially and temporally variable ambient hydrologic properties and conditions. The magnitude of repository-heat-driven buoyancy flow in …
Date:
January 1, 1993
Creator:
Buscheck, T. A. & Nitao, J. J.
Object Type:
Article
System:
The UNT Digital Library
Analysis of Shutdown Technical Specifications Using the Low Power and Shutdown Risk Model for the Surry Nuclear Power Plant
This paper describes a risk-based screening analysis that was performed on the Surry nuclear power station to evaluate the adequacy of technical specifications (TS) for PWRs during shutdown periods. Of particular concern was the risk sensitivity to allowable TS configurations while at reduced reactor coolant system inventory conditions since incidents have occurred in plants over recent years during this time. A typical refueling outage was analyzed to determine the plant configurations created due to surveillance testing and maintenance activities. The impact from single and multiple component outages were identified so their risk influence on the plant configuration could be assessed. From these results, generic insights into the efficiency of existing TS to control high risk configurations were obtained as well as the applicability and ability of the risk-based methodology employed to make that determination.
Date:
January 1, 1993
Creator:
Deem, R.; Penoyar, J. & Samanta, P.
Object Type:
Article
System:
The UNT Digital Library
Analysis of the JASPER Program Radial Shield Attenuation Experiment
The results of the analysis of the JASPER Program Radial Shield Attenuation Experiment are presented. The experiment was performed in 1986 at the ORNL Tower Shielding Facility. It is the first of six experiments in this cooperative Japanese and American program in support of shielding designs for advanced sodium-cooled reactors. Six different shielding configurations and subconfigurations thereof were studied. The configurations were calculated with the DOT-IV two-dimensional discrete ordinates radiation transport computer code using the R-Z geometry option, a symmetric S{sub 12} quadrature (96 directions), and cross sections from ENDF/B versions IV and V in either a 51- or 61-group structure. Auxiliary codes were used to compute detector responses and prepare cross sections and source input for the DOT-IV calculations. Calculated detector responses were compared with measured responses and the agreement was good to excellent in many cases. However, the agreement for configurations having thick steel or B{sub 4}C regions or for some very large configurations was fair to poor. The disagreement was attributed to cross-section data, broad-group structure, or high background in the measurements. In particular, it is shown that two cross-section sets for ``B give very different results for neutron transmission through the thick B{sub 4}C regions used …
Date:
January 1, 1993
Creator:
Slater, C. O.
Object Type:
Report
System:
The UNT Digital Library
Analysis, Volume 14, Number 1, January 1993
Periodic newsletter discussing information related to legislation, state finance, and other topics related to Texas government. This issue focuses on the TACB permit process in Texas, including problems, prospects, developments, and more.
Date:
January 1993
Creator:
Texas Research League
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Analytical laboratory and mobile sampling platform
This report covers EPA proficiency samples, USGS proficiency samples, and Los Alamos samples (approx. 20 mineral, water samples from LANL).
Date:
January 1, 1993
Creator:
Stetzenbach, K.
Object Type:
Report
System:
The UNT Digital Library
An analytical model for studying effects of gas release from a failed fuel pin of a liquid-metal reactor
A analytical model for describing dynamics of a gas bubble in the liquid sodium of a liquid-metal reactor as the result of failed fuel pins is discussed. A model to describe the coupled response of the liquid sodium surrounding the gas bubble is also discussed. The analysis method is programmed in a computer code and used to analyze some available experimental data, and the results are discussed.
Date:
January 1, 1993
Creator:
Shin, Y. W.
Object Type:
Article
System:
The UNT Digital Library
Angular resolution studies of the CYGNUS array using the shadows of the sun and moon
Using the cosmic ray shadows of the sun and moon, we have estimated the angular resolution of the CYGNUS extensive air shower array. With the event sample now available we estimate the angular resolution of the array to be 0.70[sub [minus]0.06][sup [plus]0.07] degrees. The resolution depends on the total number of detected shower particles. A new parameterization of the measured shower-front timing structure and the use of counters with small pulse areas lead to a [approximately]25% improvement in the resolution. The systematic pointing error of the array is less than 0.4[degree].
Date:
January 1, 1993
Creator:
Shoup, A. L.
Object Type:
Article
System:
The UNT Digital Library
Annotated bibliography of methods for determining sulfur and forms of sulfur in coal and coal-related materials
Over 400 published papers, presentations at scientific meetings, and reports relating to the determination of sulfur and sulfur forms in coal-related materials have been accumulated, classified, and an evaluation made of their content.
Date:
January 1, 1993
Creator:
Chriswell, C. D.; Norton, G. A.; Akhtar, S. S.; Straszheim, W. E. & Markuszewski, R.
Object Type:
Report
System:
The UNT Digital Library