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1987 Calendar of Early Denton History
Calendar for 1987 containing photographs and historical facts about Denton, Texas, Denton County, Texas, and the surrounding areas. There are notes throughout the dates on the calendar as well as a timeline titled "Denton County Trivia III" at the end.
Date:
1986
Creator:
Friends of the Denton Public Library
Object Type:
Text
System:
The Portal to Texas History
S. 2570 The Anti-Apartheid Action Act of 1986
Flyer urging support for S. 2570 which would pass sanctions against South Africa because of apartheid laws enacted by the South African government.
Date:
1986
Creator:
The Washington Office on Africa
Object Type:
Pamphlet
System:
The Gateway to Oklahoma History
27th Annual Report
The ACIR Library is composed of publications that study the interactions between different levels of government. This document is an annual report.
Date:
January 1986
Creator:
United States. Advisory Commission on Intergovernmental Relations.
Object Type:
Book
System:
The UNT Digital Library
3d-3p transitions in (. mu. /sup -/He/sup 4/)/sup +/
An experiment to measure the energy of 3d-3p transitions in the (..mu../sup -/He/sup 4/)/sup +/ ion is now in progress. The experiment, which is being performed at the Brookhaven National Laboratory Alternating Gradient Synchrotron, will use an infrared CO/sub 2/ laser to stimulate the transitions. These transitions are of interest because their energy is due almost entirely to the polarization of the vacuum. In a pure Coulomb field, states with the same principal quantum number, n, and total angular momentum, J, are degenerate. Vacuum polarization, because of its nonlinear dependence on electric field strength, results in departure from an inverse square Coulomb field, causing a splitting which depends on the orbital angular momentum, removing the degeneracy. The dominance of vacuum polarization in giving rise to these splittings in the muonic ion is in contrast to the situation in electronic atoms where vacuum polarization makes a very minor contribution to the Lamb shift. 4 refs., 4 figs.
Date:
January 1, 1986
Creator:
May, M.
Object Type:
Article
System:
The UNT Digital Library
Aaron Siskind: Fifty Years [Exhibition Photographs]
Photographs of the exhibition "Aaron Siskind: Fifty Years," June 8-August 10, 1986 held at the Dallas Museum of Art. Photographs documenting this exhibition include six gallery installation views.
Date:
1986
Creator:
Dallas Museum of Art
Object Type:
Collection
System:
The Portal to Texas History
Aaron Siskind: Fifty Years [Press Release]
Press release for the exhibition "Aaron Siskind: Fifty Years," June 8-August 10, 1986 held at the Dallas Museum of Art. The press release, dated May 9, 1986, announces and describes the exhibition.
Date:
1986
Creator:
Dallas Museum of Art
Object Type:
Text
System:
The Portal to Texas History
Abilene
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
[Abilene City Ordinances: 1986]
Ledger containing ordinances/resolutions passed by the city of Abilene, Texas during calendar year 1986.
Date:
1986
Creator:
Abilene (Tex.)
Object Type:
Legal Document
System:
The Portal to Texas History
[Abilene City Resolutions: 1986]
Ledger containing resolutions passed by the city of Abilene, Texas during calendar year 1986.
Date:
1986
Creator:
Abilene (Tex.)
Object Type:
Legal Document
System:
The Portal to Texas History
Accelerated beam experiments with the ORNL SITEX (Surface Ionization with Transverse Extraction) and VITEX (Volume Ionization with Transverse Extraction) H/sup -//D/sup -/ sources
Beam parameters have been measured for both the Surface Ionization with Transverse Extraction (SITEX) and Volume Ionization with Transverse Extraction (VITEX) H/sup -//D/sup -/ ion sources. Both sources use a reflex discharge to generate the main plasma. Beam energies up to 18 keV were used for pulse lengths up to several seconds. For SITEX, Faraday cup magnetically analyzed D/sup -/ beam currents of 110 mA at extraction densities of 48 mA/cm/sup 2/ and at a source ion temperature of 4 eV have been measured. For the VITEX results, Faraday cup magnetically analyzed beam currents of up to 80 mA at extraction densities of 27 mA/cm/sup 2/ and at a source ion temperature of 0.5 eV have been measured. Virtually all extracted electrons were recovered at an energy of 10 to 30% of the accel beam energy, and there were none in the analyzed beam.
Date:
January 1, 1986
Creator:
Dagenhart, W. K.; Tsai, C. C.; Stirling, W. L.; Ryan, P. M.; Schechter, D. E.; Whealton, J. H. et al.
Object Type:
Article
System:
The UNT Digital Library
Acceleration of electrons by the wake field of proton bunches
This paper discusses a novel idea to accelerate low-intensity bunches of electrons (or positrons) by the wake field of intense proton bunches travelling along the axis of a cylindrical rf structure. Accelerating gradients in excess of 100 MeV/m and large ''transformer ratios'', which allow for acceleration of electrons to energies in the TeV range, are calculated. A possible application of the method is an electron-positron linear collider with luminosity of 10/sup 33/ cm/sup -2/ s/sup -1/. The relatively low cost and power consumption of the method is emphasized.
Date:
January 1, 1986
Creator:
Ruggiero, Alessandro G.
Object Type:
Article
System:
The UNT Digital Library
The acceptance of the SSC (Superconducting Supercollider) clustered lattice
The physical apertures of all elements of the SSC storage lattices are considered to determine whether correction of random multipole fields in the triplet quadrupoles is necessary when betatron amplitudes there are no more than the inner radius of the beam pipe. During computer simulated beam tracking the influence of random multiple fields was included as a kick given to the test particle at the center of each quadrupole and at the ends of every dipole. The degree of multipole correction needed is shown. (LEW)
Date:
January 1, 1986
Creator:
Dell, G.F.
Object Type:
Article
System:
The UNT Digital Library
Accuracy of Nodal Transport and Simplified-P3 Fluxes in Benchmark Tests
Here we summarize recent work exploring the accuracy of fluxes computed, both by nodal transport methods, and by the simplified-spherical harmonics (SP/sub l/) method. Apparently, significant errors in nodal transport fluxes were first noted by Wagner et al., and attributed to the isotopic-transverse-leakage (ITL) approximation. Later Lawrence detected substantial errors, due to the ITL approximation, in his nodal transport (NTT) solution of the IAEA Stepanek benchmark problem. Gelbard concluded on theoretical grounds that nodal transport fluxes, computed in XY geometry using ITL, should be much more accurate on the coordinate axes than halfway between them and that, at 45/sup 0/ from the axes, nodal transport methods using ITL should give only about half of the true transport correction.
Date:
January 1, 1986
Creator:
Liu, Y.W.H. & Gelbard, E.M.
Object Type:
Article
System:
The UNT Digital Library
Accurate interatomic potentials for Ni, Al and Ni/sub 3/Al
To obtain meaningful results from atomistic simulations of materials, the interatomic potentials must be capable of reproducing the thermodynamic properties of the system of interest. Pairwise potentials have known deficiencies that make them unsuitable for quantitative investigations of defective regions such as crack tips and free surfaces. Daw and Baskes (Phys. Rev. B 29, 6443 (1984)) have shown that including a local ''volume'' term for each atom gives the necessary many-body character without the severe computational dependence of explicit n-body potential terms. Using a similar approach, we have fit an interatomic potential to the Ni/sub 3/Al alloy system. This potential can treat diatomic Ni/sub 2/, diatomic Al/sub 2/, fcc Ni, fcc Al and L1/sub 2/ Ni/sub 3/Al on an equal footing. Details of the fitting procedure are presented, along with the calculation of some properties not included in the fit.
Date:
January 1, 1986
Creator:
Voter, Arthur F. & Chen, Shao Ping
Object Type:
Article
System:
The UNT Digital Library
Acid-split flowsheets for uranium-plutonium partitioning without a reductant
The flowsheet discussed has been tested in a hot cell experiment using 10% TBP and a poorly controlled temperature near 15/sup 0/C. The test was carried out in the Solvent Extraction Test Facility at Oak Ridge National Laboratory, using highly irradiated mixed-oxide fuel from the Fast Flux Test Facility reactor at Hanford, Washington. The observed concentration profiles for U, Pu, and acid are shown graphically.
Date:
January 1, 1986
Creator:
Campbell, D.O.; Crouse, D.J. & Mills, A.L.
Object Type:
Article
System:
The UNT Digital Library
Acoustic damping for explicit calculations of fluid flow at low Mach number
A method is proposed for damping the sound waves in explicit calculations of fluid flow at low Mach number, where sound waves are usually not of interest but may distract attention from other flow features. The method is based on the introduction of an artificial pressure q of the form q = - q/sub 0/rhoc/sup 2/..delta..t(del x u - del x u/sub 0/), where q/sub 0/ is a coefficient of order unity, rho is the density, c is the sound speed, ..delta..t is the time step, and u/sub 0/ is the velocity field that would obtain at zero Mach number. When del x u/sub 0/ is zero, the method becomes equivalent to the use of an artificial bulk viscosity q/sub 0/rhoc/sup 2/..delta..t. However, del x u/sub 0/ can be substantially different from zero in problems with heat or mass sources (e.g., combustion), and its inclusion is then essential to obtain the correct pressure field. The method is well suited for use in conjunction with explicit numerical schemes that employ acoustic subcycling or artificial reduction of the sound speed for improved efficiency at low Mach number. The beneficial effects of the method are illustrated by means of calculations with an acoustic …
Date:
January 1, 1986
Creator:
Ramshaw, J. D.; O'Rourke, P. J. & Amsden, A. A.
Object Type:
Report
System:
The UNT Digital Library
Acoustic velocity measurements on fluid metals from two-fold compressions to two-fold expansions
Methods used for making acoustic velocity measurements on samples which are destroyed in time scales of milliseconds or less are described. Analytic techniques for using this data to calculate thermodynamic quantities are outlined. New results indicating a linear relationship of acoustic velocity with density over a very large density range are presented. 30 refs., 5 figs. (DWL)
Date:
January 1, 1986
Creator:
Shaner, J. W.; Hixson, R. S.; Winkler, M. A. & Brown, J. M.
Object Type:
Article
System:
The UNT Digital Library
Acoustic wave scattering from a circular crack: comparison of different computational methods
The work reported was motivated by disagreement between the results obtained from two computations of scattering of an axially incident elastic p-wave on a circular crack. One calculation involves the direct solution of the Helmholtz integral equation, showing an oscillating total cross section. The other uses a program called MOOT, in which the elastic displacement near the crack is expanded in regular spherical eigenfunctions of the elastic wave equation. This calculation shows that the oscillations in total cross section disappear rapidly at high wave numbers. The conjecture that the basis for the MOOT expansion was inappropriate is examined by application to a test problem. Results indicate that there is no inadequacy in the spherical basis set. (LEW)
Date:
January 1, 1986
Creator:
Visscher, W.M.
Object Type:
Article
System:
The UNT Digital Library
Actinide removal from nitric acid waste streams
Actinide separations research at the Rocky Flats Plant (RFP) has found ways to significantly improve plutonium secondary recovery and americium removal from nitric acid waste streams generated by plutonium purification operations. Capacity and breakthrough studies show anion exchange with Dowex 1x4 (50 to 100 mesh) to be superior for secondary recovery of plutonium. Extraction chromatography with TOPO(tri-n-octyl-phosphine oxide) on XAD-4 removes the final traces of plutonium, including hydrolytic polymer. Partial neutralization and solid supported liquid membrane transfer removes americium for sorption on discardable inorganic ion exchangers, potentially allowing for non-TRU waste disposal.
Date:
January 1, 1986
Creator:
Muscatello, A.C. & Navratil, J.D.
Object Type:
Article
System:
The UNT Digital Library
Activation analysis of the compact ignition tokamak
The US fusion program has completed the conceptual design of a compact tokamak device that achieves ignition. The high neutron wall loadings associated with this compact deuterium-tritium-burning device indicate that radiation-related issues may be significant considerations in the overall system design. Sufficient shielding will be requied for the radiation protection of both reactor components and occupational personnel. A close-in igloo shield has been designed around the periphery of the tokamak structure to permit personnel access into the test cell after shutdown and limit the total activation of the test cell components. This paper describes the conceptual design of the igloo shield system and discusses the major neutronic concerns related to the design of the Compact Ignition Tokamak.
Date:
January 1, 1986
Creator:
Selcow, E.C.
Object Type:
Article
System:
The UNT Digital Library
Active internal corrector coils
Trim or corrector coils to correct main magnet field errors and provide higher multipole fields for beam optics purposes are a standard feature of superconducting magnet accelerator systems. This paper describes some of the design and construction features of powered internal trim coils and a sampling of the test results obtained.
Date:
January 1, 1986
Creator:
Thompson, P.A.; Cottingham, J.; Dahl, P.; Fernow, R.; Garber, M.; Ghosh, A. et al.
Object Type:
Article
System:
The UNT Digital Library
Active layer hydrology for Imnavait Creek, Toolik, Alaska
In the annual hydrologic cycle, snowmelt is the most significant event at Imnavait Creek located near Toolik Lake, Alaska. Precipitation that has accumulated for more than 6 months on the surface melts in a relatively short period of 7 to 10 days once sustained melting occurs. During the ablation period, runoff dominates the hydrologic cycle. Some meltwater goes to rewetting the organic soils in the active layer. The remainder is lost primarily because of evaporation, since transpiration is not a very active process at this time. Following the snowmelt period, evapotranspiration becomes the dominate process, with base flow contributing the other watershed losses. It is important to note that the water initally lost by evapotranspiration entered the organic layer during melt. This water from the snowpack ensures that each year the various plant communities will have sufficient water to start a new summer of growth.
Date:
January 1, 1986
Creator:
Kane, D.L.
Object Type:
Report
System:
The UNT Digital Library
Activities and Operations of the Advanced Computing Research Facility. January 1985 - July 1986
This report discusses research activities and operations of the Advanced Computing Research Facility (ACRF) at Argonne National Laboratory from January 1985 through June 1986. During this period, the Mathematics and Computer Science Division (MCS) at Argonne received incremental funding from the Applied Mathematical Sciences program of the DOE Office of Energy Research to operate computers with innovative designs that promise to be useful for advanced scientific research. Over a five-month period, four new commercial multiprocessors (an Encore Multimax, a Sequent Balance 21000, an Aliant FX/8, and an Intel iPSC/d5) were installed in the ACRF, creating a new wave of research projects concerning computer systems with parallel and vector architectures. A list of projects, publications, and users supported by the ACRF is included.
Date:
1986
Creator:
Mihaly, Tina & Pieper, Gail W.
Object Type:
Report
System:
The UNT Digital Library
Activities and Operations of the Advanced Computing Research Facility : July - October 1986
Research activities and operations of the Advanced Computing Research Facility (ACRF) at Argonne National Laboratory are discussed for the period from July 1986 through October 1986. The facility is currently supported by the Department of Energy, and is operated by the Mathematics and Computer Science Division at Argonne. Over the past four-month period, a new commercial multiprocessor, the Intel iPSC-VX/d4 hypercube was installed. In addition, four other commercial multiprocessors continue to be available for research - an Encore Multimax, a Sequent Balance 21000, an Alliant FX/8, and an Intel iPSC/d5 - as well as a locally designed multiprocessor, the Lemur. These machines are being actively used by scientists at Argonne and throughout the nation in a wide variety of projects concerning computer systems with parallel and vector architectures.
Date:
1986
Creator:
Pieper, Gail W.
Object Type:
Report
System:
The UNT Digital Library