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Analytical model for the dynamic resistivity of electrically-exploded conductors
A detailed model for the dynamic resistivity of an exploding conductor presents many difficulties. An electrically-exploded conductor undergoes significant hydrodynamic expansion as it is heated. Resistivity is a function of both the temperature and density of a conductor and realistic models for resistivity over the range of parameter space experienced by an exploding conductor are quite complex. See for example, the model of Lee and More (1984). Calculation of the hydrodynamic expansion of the conductor during and subsequent to the explosion is likewise dependent on detailed knowledge of the equation of state for the conductor in a range where few experimental data exist. A further complication is the strong magnetic field which couples the hydrodynamic expansion to the currents flowing in the expanding material. In spite of the difficulties, progress is being made on detailed modeling of fuses and exploding conductors (Lidemuth and co-workers, 1985). A simpler approach has proved to be quite useful for modeling the electrical behavior of exploding bridgewire and slapper detonators and for modeling the explosionss of large conductors exploded with large capacitor banks. In the work described here, a simple, empirical model was developed which can be expressed as a closed-form algebraic expression involving four …
Date:
October 10, 1986
Creator:
Lee, R. S.
Object Type:
Article
System:
The UNT Digital Library
Radiation in the SLC final focus alcoves from beam losses in collimators and dumps
Radiation levels inside the final focus alcoves are calculated from the main dump, tune-up dumps, and adjustable collimators. Neutron calculations are done for giant resonance neutrons. Fluences of neutrons and photons in the alcoves are determined. It is concluded that, if the beam losses do indeed occur as believed, many of the electronic components in the alcoves will begin to fail after a very short running period. (LEW)
Date:
September 10, 1986
Creator:
Jenkins, T.M. & McCall, R.C.
Object Type:
Report
System:
The UNT Digital Library
Scaling of current density, total current, emittance, and brightness for hydrogen negative ion sources
The atomic and molecular processes that play a principal role in negative ion formation in a hydrogen negative ion discharge are discussed. The collisions of energetic electrons with gas molecules within the discharge lead to vibrationally excited molecules. Thermal electrons in turn attach to these excited molecules and generate negative ions via the dissociative attachment process. A system geometry chosen to optimize these collision processes is discussed that consists of a high-power discharge in tandem with a low electron temperature bath, the two regions separated by a magnetic filter. The current density extracted from such a system is found to scale inversely with the system scale length provided the gas density and electron density are also increased inversely with scale length. If a system is scaled downward in size to provide a new beamlet but one with increased current density, and these beamlets are packed to fill the original dimension, the new total extracted current will exceed the original total current by the scale factor. The emittance, epsilon, of the new system remains unchanged. The brightness, J/epsilon/sup 2/, of the new system will also be increased in proportion to the scale factor. 4 refs., 2 figs.
Date:
July 10, 1986
Creator:
Hiskes, J.R.
Object Type:
Article
System:
The UNT Digital Library
Infrared and Raman investigation of rare-earth phosphate glasses for potential use as radioactive waste forms
This project was designed to investigate the properties of the rare-earth phosphate glasses CeO{sub 2}-P{sub 2}O{sub 5} and Pr{sub 2}O{sub 3}-P{sub 2}O{sub 5} for potential use as radioactive waste glasses. The research involved determination of the glass-forming region, loading capacity, and optimum processing parameters of the glasses. Structural studies of the unloaded host glasses and glasses loaded with simulated waste elements were to be done using Raman, infrared and infrared reflection spectroscopy. Leach testing and spectroscopic studies of the corroded surfaces were also to be performed.
Date:
November 10, 1986
Creator:
Morgan, S.
Object Type:
Report
System:
The UNT Digital Library
Giant resonance phenomena in the electron impact ionization of heavy atoms and ions
Heavy atoms and ions offer an interesting opportunity to study atomic physics in a region where the atomic structure is dominated by the interelectronic interactions. One illustration of this is the profound term dependence of atomic orbitals for certain configurations of heavy atoms and ions. The appearance of giant scattering resonances in the cross sections for ionization of heavy atoms by electron impact is a manifestation of resonance behavior. Such resonant structures arise from the double well nature of the scattering potential and have recently been identified in the cross sections for the electron impact ionization of several xenon-like ions. The results of calculations showing effects for a variety of other ions are summarized. 7 refs., 4 figs.
Date:
June 10, 1986
Creator:
Younger, S.M.
Object Type:
Article
System:
The UNT Digital Library
Use of single-cutter data in the analysis of PDC bit designs
A method is developed for predicting cutter forces, temperatures, and wear on PDC bits as well as integrated bit performance parameters such as weight-on-bit (WOB), drilling torque, and bit imbalance. A computer code called PDCWEAR has been developed to make this method available as a tool for general bit design. The method uses single-cutter data to provide a measure of rock drillability and employs theoretical considerations to account for interaction among closely spaced cutters on the bit. Experimental data are presented to establish the effects of cutter size and wearflat area on the forces that develop during rock cutting. Waterjet assistance is shown to significantly reduce cutting forces, thereby extending bit life and reducing WOB and torque requirements in hard rock. The effects of bit profile, cutter placement density, bit rotary speed, and wear mode on bit life and drilling performance are investigated. 21 refs., 34 figs., 4 tabs.
Date:
October 10, 1986
Creator:
Glowka, D.A.
Object Type:
Article
System:
The UNT Digital Library
OTA Senior Management Retreat, 1986
Materials from an OTA Senior Management Retreat including memoranda, summaries, and discussion points for previous or upcoming studies and programs. The retreat was held from November 12-14, 1986.
Date:
November 10, 1986
Creator:
United States. Congress. Office of Technology Assessment.
Object Type:
Book
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 78, No. 15, Ed. 1 Thursday, April 10, 1986
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
April 10, 1986
Creator:
Tooley, Wendell
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 78, No. 28, Ed. 1 Thursday, July 10, 1986
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
July 10, 1986
Creator:
Tooley, Wendell
Object Type:
Newspaper
System:
The Portal to Texas History
[News Clip: Parents Anonymous]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
January 10, 1986, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Crusader Church]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
January 10, 1986, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Abduction]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
January 10, 1986, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
The Bogata News (Bogata, Tex.), Vol. 75, No. 27, Ed. 1 Thursday, April 10, 1986
Weekly newspaper from Bogata, Texas that includes local, state, and national news along with advertising.
Date:
April 10, 1986
Creator:
Nichols, Nanalee & Nichols, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
The Bogata News (Bogata, Tex.), Vol. 75, No. 40, Ed. 1 Thursday, July 10, 1986
Weekly newspaper from Bogata, Texas that includes local, state, and national news along with advertising.
Date:
July 10, 1986
Creator:
Nichols, Nanalee & Nichols, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
Nomenclature of SLC Arc beamline components
This note defines I and C formal names for beamline components in the Arc as specified in the TRANSPORT decks ARCN FINAL and ARCS FINAL of June 5, 1985. The formal name consists of three fields: the primary name, the zone and the unit number. The general principles and guidelines are explained in Reference 1. The rationale and the final resolutions of the naming conventions for the Arc are explained.
Date:
April 10, 1986
Creator:
Silva, J. & Weng, W. T.
Object Type:
Report
System:
The UNT Digital Library
Complex defects in the oxidation of uranium
We are reporting EPR results obtained with uranium powder samples fully oxidized in dry air, water vapor, and air/water vapor mixtures. The results reported previously are confirmed and additional paramagnetic centers, associated with chemisorbed species, have been identified. The temperature dependence of the g-value for these centers from room temperature to 10K is also reported.
Date:
June 10, 1986
Creator:
MacCrone, R. K.; Sankaran, S.; Shatynski, S. R. & Colmenares, C. A.
Object Type:
Article
System:
The UNT Digital Library
Investigation of MAGMA chambers in the Western Great Basin. Final report, 9 June 1982-31 October 1985
This report summarizes efforts made by the Seismological Laboratory toward the detection and delineation of shallow crustal zones in the western Great Basin, and toward the development of methods to accomplish such detection. The work centers around the recently-active volcanic center near Long Valley, California. The work effort is broken down into three tasks: (1) network operations, (2) data analysis and interpretation, and (3) the study of shallow crustal amomalies (magma bodies). Section (1) describes the efforts made to record thousand of earthquakes near the Long Valley caldera, and focusses on the results obtained for the November 1984 round Valley earthquake. Section (2) describes the major effort of this contract, which was to quantify the large volume of seismic data being recorded as it pertains to the goals of this contract. Efforts described herein include (1) analysis of earthquake focal mechanisms, and (2) the classification, categorization, and interpretation of unusual seismic phases in terms of reflections and refractions from shallow-crustal anomalous zones. Section (3) summarizes the status of our research to date on the locations of magma bodies, with particular emphasis on a location corresponding to the map location of the south end of Hilton Creek fault. Five lines of …
Date:
February 10, 1986
Creator:
Peppin, W.A.
Object Type:
Report
System:
The UNT Digital Library
Vacuum vessel for the tandem Mirror Fusion Test Facility
In 1980, the US Department of Energy gave the Lawrence Livermore National Laboratory approval to design and build a tandem Mirror Fusion Test Facility (MFTF-B) to support the goals of the National Mirror Program. We designed the MFTF-B vacuum vessel both to maintain the required ultrahigh vacuum environment and to structurally support the 42 superconducting magnets plus auxiliary internal and external equipment. During our design work, we made extensive use of both simple and complex computer models to arrive at a cost-effective final configuration. As part of this work, we conducted a unique dynamic analysis to study the interaction of the 32,000-tonne concrete-shielding vault with the 2850-tonne vacuum vessel system. To maintain a vacuum of 2 x 10/sup -8/ torr during the physics experiments inside the vessel, we designed a vacuum pumping system of enormous capacity. The vacuum vessel (4200-m/sup 3/ internal volume) has been fabricated and erected, and acceptance tests have been completed at the Livermore site. The rest of the machine has been assembled, and individual systems have been successfully checked. On October 1, 1985, we began a series of integrated engineering tests to verify the operation of all components as a complete system.
Date:
March 10, 1986
Creator:
Gerich, J.W.
Object Type:
Report
System:
The UNT Digital Library
Impact of several reactor features on TF coil design for TPSS
Limits of acceptable radiation levels relative to winding pack current densities in the toroidal field (TF) coils is given for relevant reactor designs. Force cooled conductors are stipulated in this study. The maximum field which can be supported while maintaining adequate stability and the ability to protect the coils in the event of a quench to end of the machine life is reported to be 6T. TF configuration, winding pack design, heat removal, stability, copper fraction and effect of damage, limiting current, and protection are discussed. 12 refs., 2 tabs. (WRF)
Date:
January 10, 1986
Creator:
Miller, J. R.
Object Type:
Report
System:
The UNT Digital Library
Design considerations for a combined synchrotron-light source and heavy-ion storage ring Atomic Physics Facility
An Atomic Physics Facility (APF) based on the combination of photons produced by a synchrotron light source with heavy ions in a storage ring will open the way to the study of ionic states of almost all elements. The design considerations for such a facility are discussed in terms of the use of synchrotron radiation for photoexcitation and ionization experiments. Design considerations for an APF are given in terms of the accelerator facilities presently available at BNL which include the National Synchrotron Light Source and Tandem Van de Graaff Laboratory. The results show that the concept is valid and therefore that implementation would result in entirely new capabilities for the study of multiply-ionized atoms.
Date:
November 10, 1986
Creator:
Jones, K. W.; Johnson, B. M.; Meron, M.; Lee, Y. Y.; Thieberger, P. & Thomlinson, W. C.
Object Type:
Article
System:
The UNT Digital Library
The Ingleside Index (Ingleside, Tex.), Vol. 37, No. 22, Ed. 1 Thursday, July 10, 1986
Weekly newspaper from Ingleside, Texas that includes local, state, and national news along with advertising.
Date:
July 10, 1986
Creator:
Fischer, Tim
Object Type:
Newspaper
System:
The Portal to Texas History
The Cherokeean. (Rusk, Tex.), Vol. 137, No. 22, Ed. 1 Thursday, July 10, 1986
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
July 10, 1986
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Cherokeean. (Rusk, Tex.), Vol. 137, No. 9, Ed. 1 Thursday, April 10, 1986
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
April 10, 1986
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
[Poster Contest Rules]
Flyer outlining guidelines for a poster contest hosted during Drug Prevention and Education Week at Martin Luther King, Jr. Middle School. The poster contest occurred from March 10th, 1986 to March 14th, 1986.
Date:
March 10, 1986
Creator:
Links, Inc. San Antonio Chapter.
Object Type:
Text
System:
The Portal to Texas History