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9,195
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Polonium-210 assay using a background-rejecting extractive liquid-scintillation method
This paper describes a procedure which combines solvent extraction with alpha liquid scintillation spectrometry. Pulse shape discrimination electronics are used to reject beta and gamma pulses and to lower the background count to acceptable levels. Concentration of /sup 210/Po and separation from interferring elements are accomplished using a H/sub 3/Po/sub 4/-HCl solution with TOPO combined with a scintillor in toluene. (DLC)
Date:
January 1, 1981
Creator:
Case, C.N. & McDowell, W.J.
Object Type:
Article
System:
The UNT Digital Library
Polyacetylene and relativistic field-theory models
Connections between continuum, mean-field, adiabatic Peierls-Froehlich theory in the half-filled band limit and known field theory results are discussed. Particular attention is given to the phi/sup 4/ model and to the solvable N = 2 Gross-Neveu model. The latter is equivalent to the Peierls system at a static, semi-classical level. Based on this equivalence we note the prediction of both kink and polaron solitons in models of trans-(CH)/sub x/. Polarons in cis-(CH)/sub x/ are compared with those in the trans isomer. Optical absorption from polarons is described, and general experimental consequences of polarons in (CH)/sub x/ and other conjugated polymers is discussed.
Date:
January 1, 1981
Creator:
Bishop, A. R.; Campbell, D. K. & Fesser, K.
Object Type:
Article
System:
The UNT Digital Library
POLYFAIL: A Program for Identification of Multiple Fuel Failures with Gas Tagging
This report describes the development of the computer code POLYFAIL for identification of fuel failures in fast reactors or light-water reactors that use gas tagging. POLYFAIL implements a sophisticated numerical algorithm known as the method of barycentric coordinates. The code can treat problems involving up to four simultaneous tag releases in a tagging system characterized by three independent tag ratios. The sensitivity of the multiple-failure-resolution technique has been optimized by incorporation of a newly developed ratio weighting scheme. Several example problems are provided to demonstrate operation of the code under single-leaker and various postulated multiple-leaker situations.
Date:
1981
Creator:
Gross, Kenny C.
Object Type:
Report
System:
The UNT Digital Library
Polyimide and polyamide-imide in a tritium atmosphere
Five different commercial polyamide-imide and polyimide specimens were kept in a tritium atmosphere (96.9 mol %, 101 kPa, initial fill conditions) for three months. Selected physical and mechanical properties of the five plastics were examined. Mass spectrometric data showed the growth of protium and HT impurity in the tritium gas.
Date:
January 1, 1981
Creator:
Wylie, K. F.; Hockett, J. E. & Buxton, T. L.
Object Type:
Article
System:
The UNT Digital Library
Polyimide and polyamide-imide in a tritium atmosphere
Five different commercial polyamide-imide and polyimide specimens were kept in a tritium atmosphere (96.9 mol %, 101 kPa, initial fill conditions) for three months. Selected physical and mechanical properties of the five plastics were examined. Mass spectrometric data showed the growth of protium and HT impurity in the tritium gas.
Date:
January 1, 1981
Creator:
Wylie, K. F.; Hockett, J. E. & Buxton, T. L.
Object Type:
Article
System:
The UNT Digital Library
Polymer coating of glass microballoons levitated in a focused acoustic field
Inertial confinement fusion (ICF) glass microballoons (GMBs) levitated in a focusing radiator acoustic device can be coated with liquid materials by deploying the liquid into the levitation field with a stepped-horn atomizer. The GMB can be forced to the center of the coating liquid with a strong acoustically generated centering force. Water solutions of organic polymers, uv-curable liquid organic monomers, and paraffin waxes have been used to prepare solid coatings on the surface of GMBs using this technique.
Date:
January 1, 1981
Creator:
Young, A. T.; Lee, M. C.; Feng, I. A.; Elleman, D. D. & Wang, T. G.
Object Type:
Article
System:
The UNT Digital Library
Polymer concrete pipe for high-temperature corrosive environments
Polymer concrete is a composite material which has strength and durability characteristics greatly superior to those of Portland cement concrete and better durability than steel. Polymer concrete has been successfully tested in brine, flashing brine and steam at temperatures up to 260/sup 0/C. Exposures were as long as 960 days. Glass filament wound polymer concrete pipe was developed with excellent strength, low weight, and a cost comparable to or less than schedule 40 steel. Connections can be made with slip joints for low pressure applications and flanged joints for high pressure applications.
Date:
January 1, 1981
Creator:
Kukacka, L. E. & Schroeder, J. E.
Object Type:
Article
System:
The UNT Digital Library
Polyphonie
Access:
Use of this item is restricted to the UNT Community
Recording of Alireza Mashayeki's Polyphonie.
Date:
1981
Creator:
Mashayeki, Alireza, 1940-
Object Type:
Sound
System:
The UNT Digital Library
Ponchatoula: Active Coastal Processes
Map showing factors that affect the shoreline and wetlands (flood surges, control structures, shoreline stabilization, etc.) in the Ponchatoula region of the Mississippi Deltaic Plain area of the coastline. Scale 1:100,000.
Date:
1981
Creator:
U.S. Fish and Wildlife Service
Object Type:
Map
System:
The UNT Digital Library
Ponchatoula: Biological Resources
Map showing biological resources (birds, oysters, fishes, grasses, etc.) in the Ponchatoula region of the Mississippi Deltaic Plain area of the coastline. Scale 1:100,000.
Date:
1981
Creator:
U.S. Fish and Wildlife Service
Object Type:
Map
System:
The UNT Digital Library
Ponchatoula: Climatology and Hydrology
Map showing hydrologic resources (water quality, groundwater availability, precipitation, etc.) in the Ponchatoula region of the Mississippi Deltaic Plain area of the coastline. Scale 1:100,000.
Date:
1981
Creator:
U.S. Fish and Wildlife Service
Object Type:
Map
System:
The UNT Digital Library
Ponchatoula: Oil and Gas Infrastructure and Mineral Resources
Map showing mineral resources (oil, gas, sand, gravel, etc.) in the Ponchatoula region of the Mississippi Deltaic Plain area of the coastline. Scale 1:100,000.
Date:
1981
Creator:
U.S. Fish and Wildlife Service
Object Type:
Map
System:
The UNT Digital Library
Ponchatoula: Socioeconomic Features
Map showing various sites and features (recreation sites, landfills, power plants, historic sites, transportation, etc.) in the Ponchatoula region of the Mississippi Deltaic Plain area of the coastline. Scale 1:100,000.
Date:
1981
Creator:
U.S. Fish and Wildlife Service
Object Type:
Map
System:
The UNT Digital Library
Ponchatoula: Soils and Geologic/Geomorphic Features
Map showing various kinds of soils and landforms in the Ponchatoula region of the Mississippi Deltaic Plain area of the coastline. Scale 1:100,000.
Date:
1981
Creator:
U.S. Fish and Wildlife Service
Object Type:
Map
System:
The UNT Digital Library
Portable neutron measurement technique for the assay of /sup 235/U in LWR fuel assemblies
An active neutron interrogation technique has been developed for the measurement of the /sup 235/U content in fresh fuel assemblies. The method employs an AmLi neutron source to induce fission reactions in the fuel assembly and coincidence counting of the resulting fission reaction neutrons. When no interrogation source is present, the passive neutron coincidence rate gives a measure of the /sup 238/U via the spontaneous fission reactions. The system can be applied to the fissile content determination in HWR, BWR, and LWR fuel assemblies for accountability, criticality control, and safeguards purposes.
Date:
January 1, 1981
Creator:
Menlove, H. O. & Krick, M. S.
Object Type:
Article
System:
The UNT Digital Library
Portable, solid-source, quadruple MS for rapid assay of U and Pu
A lightweight mass spectrometer was developed which can be carried into a nuclear plant for isotopic analyses on uranium and plutonium. Hewlett-Packard's gas chromatograph mass spectrometer model 5992A was used; the gas chromatograph part was discarded. The instrument weighs less than 100 kg. (DLC)
Date:
1981~
Creator:
Echo, M. W.
Object Type:
Article
System:
The UNT Digital Library
Portland News (Portland, Tex.), Vol. 16, No. 1, Ed. 1 Thursday, January 1, 1981
Weekly newspaper from Portland, Texas that includes local, state, and national news along with advertising.
Date:
January 1, 1981
Creator:
Leveen, Paul D.
Object Type:
Newspaper
System:
The Portal to Texas History
[Portrait of Pastor Dan Lauderdale and Family]
Studio portrait photograph of the Lauderdale family in front of a cloudy, brown backdrop. The man in the very back who stands above the rest is Pastor Dan Lauderdale. He wears a striped red shirt with white trim accents on his collar and sleeves. The older woman whose hair has been pulled back and pinned with flowers is Pastor Dan Lauderdale's mother, Dorothy Galbraith Lauderdale. Cindy Lauderdale is seated on the right and wears a red gingham dress. She is Pastor Dan's wife. Their two children are in the front, Rachel and Tabitha; however, these names have not been matched properly to their individual positions.
Date:
1981/1985
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
[Portrait of Reverend James Bethell]
Portrait photograph of Reverend James Bethell of St. David's Church. He is wearing a black jacket and is looking towards the camera smiling.
Date:
1981
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
[Posed Portrait of the One O'Clock Lab Band in Kenton Hall]
Photograph of the One O'Clock Lab Band taken in Kenton Hall. The musicians are arranged in three rows with director Neil Slater standing near the center of the group.
Date:
1981
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
Position diagnostics for a magnetic-pinch imploding-cylinder x-ray generator
For the diagnostic instrumentation of an imploding cylindrical plasma intended as a prototype for a high-intensity flash x-ray source, two systems have been developed which employ batteries of inexpensive 1.2-ns (FWHM) nitrogen lasers fired in sequence during the approx.2-..mu..s period of the implosion. Four pinhole-schlieren paraxial photographs are taken, and eight radial profiles are obtained using a novel position-sensitive detector based on a fluorescent plastic-fiber optical delay line.
Date:
January 1, 1981
Creator:
Seagrave, J. D.; Woods, C. W. & Jones, L. A.
Object Type:
Article
System:
The UNT Digital Library
Possible applications of the steering of charged particles by bent single crystals
This article reviews some aspects of the steering of charged particles using channeling in bent crystals. Crystal angular and spatial acceptance, deflection dechanneling, and radiation damage are discussed. Examples of possible bent transport, focusing, the possibility of charm particle separated beams, and magnetic moment determination.
Date:
January 1, 1981
Creator:
Carrigan, R. A., Jr.; Gibson, W. M.; Sun, C. R. & Tsyganov, E. N.
Object Type:
Article
System:
The UNT Digital Library
Post-test analysis of dryout test 7B' of the W-1 Sodium Loop Safety Facility Experiment with the SABRE-2P code. [LMFBR]
An understanding of conditions that may cause sodium boiling and boiling propagation that may lead to dryout and fuel failure is crucial in liquid-metal fast-breeder reactor safety. In this study, the SABRE-2P subchannel analysis code has been used to analyze the ultimate transient of the in-core W-1 Sodium Loop Safety Facility experiment. This code has a 3-D simple nondynamic boiling model which is able to predict the flow instability which caused dryout. In other analyses dryout has been predicted for out-of-core test bundles and so this study provides additional confirmation of the model.
Date:
January 1, 1981
Creator:
Rose, S.D. & Dearing, J.F.
Object Type:
Article
System:
The UNT Digital Library
Posttest analysis of international standard problem 10 using RELAP4/MOD7. [PWR]
RELAP4/MOD7, a best estimate computer code for the calculation of thermal and hydraulic phenomena in a nuclear reactor or related system, is the latest version in the RELAP4 code development series. This paper evaluates the capability of RELAP4/MOD7 to calculate refill/reflood phenomena. This evaluation uses the data of International Standard Problem 10, which is based on West Germany's KWU PKL refill/reflood experiment K9A. The PKL test facility represents a typical West German four-loop, 1300 MW pressurized water reactor (PWR) in reduced scale while maintaining prototypical volume-to-power ratio. The PKL facility was designed to specifically simulate the refill/reflood phase of a hypothetical loss-of-coolant accident (LOCA).
Date:
January 1, 1981
Creator:
Hsu, M.; Davis, C.B.; Peterson, A.C. Jr. & Behling, S.R.
Object Type:
Article
System:
The UNT Digital Library