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Office of Scientific & Technical Information Technical Reports
3,697
Texas State Publications
448
Texas Attorney General Opinions
192
USGS Topographic Map Collection
155
Texas Register
98
Office of Technology Assessment
93
Technical Report Archive and Image Library
76
Advisory Commission on Intergovernmental Relations
13
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12
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10
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Texas Register
98
7.5 Minute Series (Topographic)
75
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50
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49
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47
Argonne National Laboratory Reports
34
Texas Motor Vehicle Traffic Accident Summaries
29
Digital Raster Graphic Topographic Maps: 7.5 Minute Series (Topographic)
28
National Bureau of Standards Reports
21
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15
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4,808 Matching Results
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Atomistic simulations of (001) symmetric tilt boundaries in Ni/sub 3/Al
We report a systematic atomistic simulation study of (001) symmetric tilt grain boundaries (GB) in Ni/sub 3/Al, Ni, and Al. We found that the grain boundary energies and cohesive energies of Ni/sub 3/Al and pure fcc Ni are approximately the same. Grain boundary energies and cohesive energies in Ni/sub 3/Al depends strongly on the grain boundary composition. The Al-rich boundaries have highest grain boundary energies and lowest cohesive energies. This offers an explanation for the stoichiometric effect on the boron ductilization.
Date:
January 1, 1986
Creator:
Chen, S. P.; Voter, A. F. & Srolovitz, D. J.
Object Type:
Article
System:
The UNT Digital Library
Atomistic simulations of surface relaxations in Ni, Al, and their ordered alloys
We have performed a series of simulations to examine the atomistic nature of surface relaxations in pure metals and ordered alloys. The surface relaxations (..delta..d/sub n,n+1/) are shown to be oscillatory and to decay rapidly into the bulk. The period and form of the oscillation may be determined by simple geometrical arguments. The oscillation wavelength is always of order an atomic diameter. In pure metals, the surface layer of atoms always displaces inward. However, in the ordered alloys the larger atom may displace outward. On planes composed of more than one atom types, rippling occurs.
Date:
January 1, 1986
Creator:
Chen, S. P.; Voter, A. F. & Srolovitz, D. J.
Object Type:
Article
System:
The UNT Digital Library
Atoms in dense plasmas
Recent experiments with high-power pulsed lasers have strongly encouraged the development of improved theoretical understanding of highly charged ions in a dense plasma environment. This work examines the theory of dense plasmas with emphasis on general rules which govern matter at extreme high temperature and density. 106 refs., 23 figs.
Date:
January 1, 1986
Creator:
More, R.M.
Object Type:
Article
System:
The UNT Digital Library
Attempts to characterize microballoon sensors for shock velocity and material motion studies
Optimization of performance of gas filled microballoons mounted on optical fibers as sensors for shock and material motion studies, was attempted by variation of several parameters. In some cases, results were not predictable and, in general, results were not as reproductible as desired. Change of some parameters caused little effect but effects of the sleeve size and sleeve material seem to be significant. Recorded shape of optical spectra match black-body temperature of 8000/sup 0/K when argon filled balloons were impacted with projectiles with velocity of 1 km/s, in close agreement with expected values based on ideal gas calculations. 3 refs., 10 figs.
Date:
January 1, 1986
Creator:
Kruse, H. W.; Looney, L. D.; Taylor, R. C.; Medina, R. S.; Baumgart, J. S.; Baca, G. T. et al.
Object Type:
Article
System:
The UNT Digital Library
Autodetachment spectroscopy of metastable negative ions
This paper is a review of some of our recent measurements on the metastable negative ions, Be/sup -/ and He/sub 2//sup -/, using the technique of fast-beam autodetachment spectroscopy. 7 refs., 5 figs.
Date:
January 1, 1986
Creator:
Kvale, T. J.; Compton, R. N.; Alton, G. D.; Thompson, J. S. & Pegg, D. J.
Object Type:
Article
System:
The UNT Digital Library
Automatic titrator for high precision plutonium assay
Highly precise assay of plutonium metal is required for accountability measurements. We have developed an automatic titrator for this determination which eliminates analyst bias and requires much less analyst time. The analyst is only required to enter sample data and start the titration. The automated instrument titrates the sample, locates the end point, and outputs the results as a paper tape printout. Precision of the titration is less than 0.03% relative standard deviation for a single determination at the 250-mg plutonium level. The titration time is less than 5 min.
Date:
January 1, 1986
Creator:
Jackson, D. D. & Hollen, R. M.
Object Type:
Article
System:
The UNT Digital Library
Autonomous differential equations for the Henon map and other two-dimensional diffeomorphisms
For the study of bifurcations and chaotic behavior of nonlinear dynamical systems discrete mappings turned out to be extremely useful. In order to study the smooth evolution underlying two dimensional invertible mappings, we discuss the suspension of the Henon map of the plane, the standard map on the torus and more general cremona transformations of the plane. 16 refs.
Date:
January 1, 1986
Creator:
Mayer-Kress, G.
Object Type:
Article
System:
The UNT Digital Library
AVLIS: a technical and economic forecast
The AVLIS process has intrinsically large isotopic selectivity and hence high separative capacity per module. The critical components essential to achieving the high production rates represent a small fraction (approx.10%) of the total capital cost of a production facility, and the reference production designs are based on frequent replacement of these components. The specifications for replacement frequencies in a plant are conservative with respect to our expectations; it is reasonable to expect that, as the plant is operated, the specifications will be exceeded and production costs will continue to fall. Major improvements in separator production rates and laser system efficiencies (approx.power) are expected to occur as a natural evolution in component improvements. With respect to the reference design, such improvements have only marginal economic value, but given the exigencies of moving from engineering demonstration to production operations, we continue to pursue these improvements in order to offset any unforeseen cost increases. Thus, our technical and economic forecasts for the AVLIS process remain very positive. The near-term challenge is to obtain stable funding and a commitment to bring the process to full production conditions within the next five years. If the funding and commitment are not maintained, the team will disperse …
Date:
January 1, 1986
Creator:
Davis, J.I. & Spaeth, M.L.
Object Type:
Article
System:
The UNT Digital Library
Azle 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:
1986
Creator:
United States. Army. Corps of Engineers.
Object Type:
Map
System:
The Portal to Texas History
Ba(OH)/sub 2/. 8H/sub 2/O process for the removal and immobilization of carbon-14. Final report
The airborne release of /sup 14/C from various nuclear facilities has been identified as a potential biohazard due to the long half-life of /sup 14/C (5730 years) and the ease with which it may be assimilated into the biosphere. At ORNL, technology has been developed for the removal and immobilization of this radionuclide. Prior studies have indicated that /sup 14/C will likely exist in the oxidized form as CO/sub 2/ and will contribute slightly to the bulk CO/sub 2/ concentration of the gas stream, which is air-like in nature (approx.300 ppM/sub v/ CO/sub 2/). The technology that has been developed utilizes the CO/sub 2/-Ba(OH)/sub 2/.8H/sub 2/O gas-solid reaction with the mode of gas-solid contacting being a fixed bed. The product, BaCO/sub 3/, possesses excellent thermal and chemical stability, prerequisites for the long-term disposal of nuclear wastes. For optimal process operation, studies have indicated that an operating window of adequate size does exist. When operating within the window, high CO/sub 2/ removal efficiency (effluent concentrations <100 ppB/sub v/), high reactant utilization (>99%), and an acceptable pressure drop across the bed (3 kPa/m at a superficial velocity of 13 cm/s) are possible. Three areas of experimental investigation are reported: (1) microscale studies …
Date:
January 1, 1986
Creator:
Haag, G.L.; Holladay, D.W.; Pitt, W.W. Jr. & Young, G.C.
Object Type:
Report
System:
The UNT Digital Library
Basic Considerations on Surface Optical Nonlinearities
The origins of the surface nonlinearity in surface second harmonic generation are discussed. It is shown that this second-order nonlinear optical process is characterized by a surface nonlinear susceptibility tensor containing both local and nonlocal contributions.
Date:
January 1, 1986
Creator:
Guyot-Sionnest, P.; Chen, W. & Shen, Y.R.
Object Type:
Article
System:
The UNT Digital Library
Bastrop 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:
1986
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
Bastrop 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:
1986
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
Battery pack/controller for high temperature applications
At temperatures in excess of 300/sup 0/C, standard conductive wirelines cannot be used for signal or power transmission in geothermal wells. At such temperatures, a mechanical slickline can be used to raise and lower instrumentation, but the instrumentation control and power must then be self contained. This paper reviews the development of a battery and timing circuit to control a motor in a Los Alamos National Laboratory sampling tool. The battery pack-controller circuitry enclosed in a dewar was used in the Salton Sea Scientific Drilling Project (SSSDP) for temperatures approaching 400/sup 0/C.
Date:
January 1, 1986
Creator:
Wolfenbarger, F.M.
Object Type:
Article
System:
The UNT Digital Library
Be(d,n) Source at a Modest Facility
Source characterization for deuteron energies less than 8 MeV is discussed including: intensity, spectrum and angular distributions. Pulsed and steady-state applications of the source to the acquisition of fast-neutron data are illustrated by energy-averaged neutron total cross-section and spectrum-averaged activation cross-section measurements. Source utilization, measurement techniques, and experimental results are described with attention to self-shielding effects, background suppression and specification of uncertainties. These illustrations are extrapolated to broader-scope studies, taking advantage of the high fact-neutron intensities. The present and future potential is determined more by detection capability than by source properties. 19 refs., 9 figs.
Date:
January 1, 1986
Creator:
Smith, A. B.; Smith, D. L. & Whalen, J. F.
Object Type:
Article
System:
The UNT Digital Library
Beam chopper development at LAMPF
In order to reduce pileup limitations on ..mu..SR data rates, a fast chopper for surface muon beams was built and tested at LAMPF. The system allowed one muon at a time to be stopped in a ..mu..SR sample in the following way: A surface beam from the LAMPF Stopped Muon Channel was focused through a crossed-field beam separator and onto a chopper slit. With the separator E and B fields adjusted properly, the beam could pass through the slit. The beam to the ..mu..SR sample was turned on or off (chopped) rapidly by switching the high voltage applied to the separator plates on or off within approximately 500 ns; with the E field off, the B field deflected the beam, dumping it near the slit. We demonstrated that, with improved electronics, we will be able to stop a single muon in a ..mu..SR sample as frequently as once every 20 ..mu..s and that data rates for the system can be a factor of five higher than is attainable with unchopped beams. The observed positron contamination of the beam was less than five percent, and the ratio of the muon rate with beam on to the rate with beam off was …
Date:
January 1, 1986
Creator:
Hutson, R. L.; Cooke, D. W.; Heffner, R. H.; Schillaci, M. E.; Dodds, S. A. & Gist, G. A.
Object Type:
Article
System:
The UNT Digital Library
Beam Developments for the Harwell Microprobe System
A consequence of the rapid development of micron and submicron size electronic devices is the diminished applicability of high energy ion microprobes with their present resolution limitations to the study of such components. Although submicron beams have been reported the available beam current is barely sufficiently for PIXE and is not adequate for RBS. This lack of lateral resolution is due to low beam brightness at the microprobe object and aberrations in the focusing elements. As part of a program to address these problems the Harwell microprobe lens has been relocated on a new 5 MV Laddertron accelerator. The increased brightness and improved stability of this facility has so far led to a reduction in beam size from 3 x 3 mS to about 2 x 2 mS. The feasibility of using a liquid metal ion source has been examined with a view to achieving more substantial increases in brightness. While such sources have brightness approximately 10V times greater than conventional gaseous sources the highly divergent nature of the beam presents problems for the beam transport system. The use of a liquid metal source on the accelerator has been successfully demonstrated but it indicates the need for a special low …
Date:
January 1, 1986
Creator:
Read, P. M.; Cookson, J. A. & Alton, G. D.
Object Type:
Article
System:
The UNT Digital Library
Beam profile measurements on the advanced test accelerator using optical techniques
Beam current density profiles of ATA have been measured both spatially and temporally using a number of diagnostics. An extremely important technique involves measuring optical emissions from either a target foil inserted into the beam path or gas atoms and molecules excited by beam electrons. This paper describes the detection of the optical emission. A 2-D gated television camera with a single or dual micro-channel-plate (MCP) detector for high gain provides excellent spatial and temporal resolution. Measurements are routinely made with resolutions of 1 mm and 5 ns respectively. The optical line of sight allows splitting part of the signal to a streak camera or photometer for even higher time resolution.
Date:
January 1, 1986
Creator:
Chong, Y.P.; Kalibjian, R.; Cornish, J.P.; Kallman, J.S. & Donnelly, D.
Object Type:
Article
System:
The UNT Digital Library
Beam profile of the advanced test accelerator under laser-ion guiding
Laser-ion guiding is currently deployed on the Advanced Test Accelerator (ATA). Beam profiles are measured as a function of time by detecting optical emissions from foils inserted into the beam path. The beam size is observed to grow with time into the pulse. Two other experimental measurements support this observation: (1) vacuum expansion of the beam shows a loss of current in the latter part of the pulse; (2) beam transport through a pipe of reduced diameter results in a similar loss of current in the tail. These observations of increasing beam size are contrary to expectations based on increasing focus strength due to beam-induced ionization. Possible explanations will be presented.
Date:
January 1, 1986
Creator:
Chong, Y. P.; Caporaso, G. J.; Lauer, E. J.; Prono, D. S.; Rainer, F.; Struve, K. W. et al.
Object Type:
Article
System:
The UNT Digital Library
BEATRIX: The international breeder materials exchange
The BEATRIX experiment is an IEA-sponsored effort that involves the exchange of solid breeder materials and shared irradiation testing among research groups in several countries. The materials will be tested in both closed capsules (to evaluate material lifetime) and opened capsules (to evaluate purge-flow tritium recovery). Pre- and post-irradiation measurement of thermophysical and mechanical properties will also be carried out.
Date:
January 1, 1986
Creator:
Johnson, C. E.; Reuther, T. C. & Dupouy, J. M.
Object Type:
Article
System:
The UNT Digital Library
Beaumont
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:
1986
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
Beaver
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:
1986
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
Beckville 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:
1986
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
Bee Cave Hollow 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:
1986
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History