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Scale transformations, the energy-momentum tensor, and the equation of state
The Equation of State (EOS) relates diagonal elements of the energy-momentum tensor {theta}{sub {mu}{nu}}. The first moment of the energy-momentum tensor generates scale transformations. The virial theorem, a consequence of the behavior of the energy density under scale transformations, allows one to eliminate the kinetic energy in terms of the potential terms. The trace theorem for the energy-momentum tensor expresses {epsilon}-3p in terms of ensemble averages of scale-breaking operators, allowing a new approach to the EOS. 10 refs.
Date:
June 1989
Creator:
Carruthers, P.
Object Type:
Article
System:
The UNT Digital Library
Resource Conservation and Recovery Act (RCRA)
This Resource Conservation and Recovery Act (RCRA) Facility Investigation Program Plan has been developed to provide a framework for the completion of RCRA Facility Investigations (RFI) at identified units on the Savannah Rive Site (SRS) facility. As such, the RFI Program Plan provides: technical guidance for all work to be performed, managerial control, a practical, scientific approach. The purpose of this Overview is to demonstrate how the basic RFI Program Plan elements (technical, management, and approach) are interwoven to provide a practical and workable plan. The goal of the RFI Program Plan is to provide a systematic, uniform approach for performance and reporting. In addition, the RFI Program Plan has been developed to be specific to the SRS facility and to adhere to the Environmental Protection Agency (EPA) RFI guidance received as part of the SRS. The US EPA publication Characterization of Hazardous Waste Sites'' has been liberally adapted for use in this RFI Program Plan.
Date:
June 30, 1989
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Variations in volatiles in magma bodies based on studies of melt inclusions
Knowledge of volatile concentrations in magmas are important in the prediction of explosive volcanism, and contribute to the understanding of the carbon dioxide budget of the atmosphere. Some important variables that are controlled by volatiles are: crystallization temperature of phases, composition of liquids minimum, and viscosity. Volatiles are also catalysts for reactions.
Date:
June 15, 1989
Creator:
Vogel, T. A.
Object Type:
Report
System:
The UNT Digital Library
LIMB Demonstration Project Extension
The basic goal of the Limestone Injection Multistage Burner (LIMB) demonstration is to extend LIMB technology development to a full- scale application on a representative wall-fired utility boiler. The successful retrofit of LIMB to an existing boiler is expected to demonstrate that (a) reductions of 50 percent or greater in SO{sub x} and NO{sub x} emissions can be achieved at a fraction of the cost of add-on FGD systems, (b) boiler reliability, operability, and steam production can be maintained at levels existing prior to LIMB retrofit, and (c) technical difficulties attributable to LIMB operation, such as additional slagging and fouling, changes in ash disposal requirements, and an increased particulate load, can be resolved in a cost-effective manner. The primary fuel to be used will be an Ohio bituminous coal having a nominal sulfur content of 3 percent or greater.
Date:
June 15, 1989
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Broad-beam multi-ampere metal ion source
An embodiment of the MEVVA (metal vapor vacuum arc) high current metal ion source has been developed in which the beam is formed from a 10-cm diameter set of extractor grids and which produces a peak beam current of up to several Amperes. The source, MEVVA V, operates in a pulsed mode with a pulse width at present 0.25 ms and a repetition rate of up to several tens of pulses per second (power supply limited). The multicathode feature that was developed for the prior source version, MEVVA IV, has been incorporated here also; one can switch between any of 18 separate cathodes and thus metallic beam species. Maximum beam extraction voltage is over 90 kV, and since the ion charge state typically from Q = 1 to 5, depending on the metal employed, the ion energy in the extracted beam can thus be up to several hundred keV. This source is a new addition to the MEVVA family of metal ion sources, and we are at present investigating the operational regimes and the limits to the source performance. In this paper we describe the source and present some preliminary results. 10 refs., 4 figs.
Date:
June 1, 1989
Creator:
Brown, I.G.; Galvin, J.E.; MacGill, R.A.; Paoloni, F.J. (Lawrence Berkeley Lab., CA (USA) & Engineering), Wollongong Univ. (Australia). Dept. of Electrical
Object Type:
Article
System:
The UNT Digital Library
Savannah River Site RCRA Facility Investigation plan: Road A Chemical Basin
The nature of wastes disposed of at the Road A Chemical Basin (RACB) is such that some degree of soil contamination is probable. Lead has also been detected in site monitoring wells at concentrations above SRS background levels. A RCRA Facility Investigation (RFI) is proposed for the RACB and will include a ground penetrating radar (GPR) survey, collection and chemical and radiological analyses of soil cores, installation of groundwater monitoring wells, collection and chemical and radiological analyses of groundwater samples, and collection of chemical and radiological analyses of surface water and sediment samples. Upon completion of the proposed RFI field work and chemical and radiological analyses, and RFI report should be prepared to present conclusions on the nature and extent of contamination at the site, and to make recommendations for site remediation. If contamination is detected at concentrations above SRS background levels, a receptor analysis should be done to evaluate potential impacts of site contamination on nearby populations.
Date:
June 1, 1989
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Seismic monitoring of a flow test in the Salton Sea Geothermal Field
The purpose of this seismic monitoring project was to characterize in detail the micro-seismic activity related to the flow-injection test in the Salton Sea Geothermal Field. Our goal was to determine if any sources of seismic energy related to the test were observable at the surface, using both conventional seismic network techniques and relatively newer array techniques. These methods allowed us to detect and locate both impulsive microearthquakes and continuous sources of seismic energy. Our network, which was sensitive enough to be triggered by magnitude 0.0 or larger events, found no impulsive microearthquakes in the vicinity of the flow test in the 8 month period before the test and only one event during the flow test. We have observed some continuous seismic noise sources that may be attributed to the flow test. 4 refs., 4 figs.
Date:
June 1, 1989
Creator:
Jarpe, S.P.; Kasameyer, P.W. & Johnston, C.
Object Type:
Article
System:
The UNT Digital Library
Methane oxidation over dual redox catalysts
The objective of this research is to develop the scientific background for direct catalytic oxidation of methane over oxides that are doubly doped with transition metal ions. The desired process aims at employing of a double redox mechanism, where one redox couple is utilized for activation of oxygen and another for the conversion of CH{sub 3} radicals to carbocations via electron transfer reaction. The latter species can react with surface OH{sup {minus}} groups to form methanol or formaldehyde. To establish the foundations for such a process, two groups of the catalysts, one containing dispersed redox centers (Cu{sup I}/Fe{sup III}/ZnO and Cu{sup I}/Sn{sup IV}/ZnO) and a second of delafossite-type oxides containing concentrated redox centers (CuFeO{sub 2}, CuCoO{sub 2}) were synthesized and chemically analyzed for composition. For the sake of comparison, undoped ZnO treated in the same way as doped zinc oxide catalysts was also prepared. The samples were characterized by X-ray diffraction, BET surface area measurements and preliminarily by scanning electron microscopy. A catalytic testing unit and reactor to study the title reaction were designed and constructed.
Date:
June 1, 1989
Creator:
Klier, Kamil; Herman, Richard G. & Sojka, Zbigniew
Object Type:
Report
System:
The UNT Digital Library
Heavy Ion Fusion Accelerator Research (HIFAR) half-year report, October 1, 1988--March 31, 1989
The basic objective of the Heavy Ion Fusion Accelerator Research (HIFAR) program is to assess the suitability of heavy ion accelerators as igniters for Inertial Confinement Fusion (ICF). A specific accelerator technology, the induction linac, has been studied at the Lawrence Berkeley Laboratory and has reached the point at which its viability for ICF applications can be assessed over the next few years. The HIFAR program addresses the generation of high-power, high-brightness beams of heavy ions, the understanding of the scaling laws in this novel physics regime, and the validation of new accelerator strategies, to cut costs. Key elements to be addressed include: beam quality limits set by transverse and longitudinal beam physics; development of induction accelerating modules, and multiple-beam hardware, at affordable costs; acceleration of multiple beams with current amplification --both new features in a linac -- without significant dilution of the optical quality of the beams; and final bunching, transport, and accurate focusing on a small target.
Date:
June 1, 1989
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Variational theory of nuclear and neutron matter
In these lectures we will discuss attempts to solve the A = 3 to {infinity} nuclear many-body problems with the variational method. We choose the form of a variational wave function {Chi}{sub v}(1, 2{hor ellipsis}A) to describe the ground state. The {Chi}{sub v} and the ground-state energy E{sub v} are obtained by minimizing E{sub v} = {l angle}{Chi}{sub v}{vert bar}H{vert bar}{Chi}{sub v}{r angle}/{l angle}{Chi}{sub v}{vert bar}{Chi}{sub v}{r angle} with respect to variations in {Chi}{sub v}. If the form of the variational wave function is chosen properly we can expect {Chi}{sub v} {approx} {Chi}{sub 0} and E{sub v} {approx} E{sub 0} where {Chi}{sub 0} and E{sub 0} are the exact ground-state wave function and energy. In general E{sub v} {ge} E{sub 0} in variational calculations. 63 refs., 11 figs.
Date:
June 1, 1989
Creator:
Pandharipande, V.R.; Wiringa, R.B. (Illinois Univ., Urbana, IL (USA). Dept. of Physics & Argonne National Lab., IL (USA))
Object Type:
Article
System:
The UNT Digital Library
Characterization of nanophase materials by x-ray diffraction and computer simulation
X-ray diffraction experiments on nanophase Pd have been performed with the primary goal of determining the nature of grain boundary structures in nanophase materials. A kinematical diffraction analysis has been developed to interpret x-ray {theta}--2{theta} data by comparing actual scans with scans produced by computer simulation. This simulation program has been used to explore the effects on diffracted intensity of a variety of microstructural and grain boundary structural parameters such as void concentration, grain size, grain boundary width, and changes in interplanar spacing and density in grain boundary regions. It has been found that a reasonable match to experimental data is produced by at least two model structures; in one, the material contains randomly positioned voids or vacancies, while in the other, the interplanar spacings in grain boundary regions are varied with respect to the spacings found in the grain interiors. 7 refs., 4 figs.
Date:
June 1, 1989
Creator:
Eastman, J.A. & Thompson, L.J. (Argonne National Lab., IL (USA))
Object Type:
Article
System:
The UNT Digital Library
Operational characteristics of a metal vapor vacuum arc ion source
The MEVVA ion source can produce high current pulsed beams of metallic ions using a metal vapor vacuum arc discharge as the plasma medium from which the ions are extracted. In this study, the operational characteristics of the MEVVA IV ion source are summarized. Results are presented of measurements of the ion beam current as a function of arc current over a range of extraction voltage. Ti, Ta and Pb were examined as the cathode materials. The arc current ranged from 50A to 250A and the extraction voltage from 10kV to 80kV. The ion beam current was measured at two different distances from the ion source using Faraday cups, so as to investigate the beam divergence. Additionally, the cathode erosion rates were measured. Optimum operating conditions of the MEVVA ion source were determined. 10 refs., 6 figs.
Date:
June 1, 1989
Creator:
Shiraishi, Hiroshi.; Brown, I.G. (Nippon Steel Corp., Kitakyushu (Japan) & Lawrence Berkeley Lab., CA (USA))
Object Type:
Article
System:
The UNT Digital Library
Some novel design features of the LBL metal vapor vacuum arc ion sources
The family of MEVVA (metal vapor vacuum arc) high current metal ion sources developed at LBL over the past several years has grown to include a number of different source versions with a wide range of some of the design and operational parameters. The MicroMEVVA source is a particularly compact version, about 2 cm diameter and 10 cm long, while the MEVVA IV weighs some 30 kG. MEVVAs IV and V incorporate multiple cathode assemblies (16 and 18 separate cathodes, respectively), and the operating cathode can be switched rapidly and without down-time. The new MEVVA V embodiment is quite compact considering its broad beam (10 cm), high voltage (100 kV) and multiple cathode features. The large-area extractor grids used in the MEVVA V were fabricated using a particularly simple technique, and they are clamped into position and so can be changed simply and quickly. The electrical system used to drive the arc is particularly simple and incorporates several attractive features. In this paper we review and describe a number of the mechanical and electrical design features that have been developed for these sources. 9 refs., 5 figs.
Date:
June 1, 1989
Creator:
MacGill, R.A.; Brown, I.G. & Galvin, J.E.
Object Type:
Article
System:
The UNT Digital Library
Pressure oscillations caused by momentum on shut in of a high rate well in a fractured formation
Pressure transient testing techniques are an important part of reservoir and production testing procedures. These techniques are frequently used to determine practical information about underground reservoirs such as the permeability, porosity, liquid content, reservoir and liquid discontinuities and other related data. This information is valuable in helping to analyze, improve and forecast reservoir performance. This report is concerned with developing models for pressure transient well testing in high permeability, high flow rate, naturally fractured reservoirs. In the present work, a study was made of the effects of liquid inertia in the fractures and the wellbore on the pressure response obtained during a well test. The effects of turbulent flow and multi-phase flow effects such as gravitational segregation or anisotropic porous media effects were not considered. The scope of the study was limited to studying inertial effects on the pressure response of a fractured reservoir.
Date:
June 1, 1989
Creator:
Bhatnagar, S.
Object Type:
Report
System:
The UNT Digital Library
Comparison of Surface Meteorological Data Representativeness for the Weldon Spring Transport and Dispersion Modeling Analysis
The US Department of Energy is conducting the Weldon Spring Site Remedial Action Project under the Surplus Facilities Management Program (SFMP). The major goals of the SFMP are to eliminate potential hazards to the public and the environment that associated with contamination at SFMP sites and to make surplus property available for other uses to the extent possible. This report presents the results of analysis of available meteorological data from stations near the Weldon Spring site. Data that are most representative of site conditions are needed to accurately model the transport and dispersion of air pollutants associated with remedial activities. Such modeling will assist the development of mitigative measures. 17 refs., 12 figs., 6 tabs.
Date:
June 1, 1989
Creator:
Lazaro, M.
Object Type:
Report
System:
The UNT Digital Library
[Cece Cox, Avery Maixner, and Evan Wolfson]
Photograph of three people standing on the lawn outside of The Dallas Morning News building. From left to right: Cece Cox, Avery Maixner, and Evan Wolfson. Handwritten on the back of this photograph are the words, "53 Cece Cox, Pres. Avery Maixner Board Member. Evan Wolfson, lawyer of Hawaii case, Lambda Legal Defense & Education Fund."
Date:
June 29, 1989
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Letter from Ann Lupkowski to Jim Miller, June 14, 1989]
Letter from Ann Lupkowski to Jim Miller, on June 14, 1989, congratulating him on the funding of the Texas Academy of Mathematics and Science by the Texas Legislature. She also mentions that she intends to apply for federal grants for projects for gifted and talented students.
Date:
June 14, 1989
Creator:
Lupkowski, Ann E.
Object Type:
Letter
System:
The UNT Digital Library
Faculty Recital: 1989-06-05 - Julia Smith in Memoriam
Access:
Use of this item is restricted to the UNT Community
Faculty recital performed at the UNT College of Music Recital Hall.
Date:
June 5, 1989
Creator:
UNT Music Faculty
Object Type:
Sound
System:
The UNT Digital Library
Evaluation of Industrial Magnetic Heat Pump/Refrigerator Concepts that Utilize Superconducting Magnets
This report provides a preliminary assessment of some magnetic heat pump (MHP)/refrigeration concepts for cryogen liquefaction and other industrial applications. The study was performed by Astronautics Corporation of America for Argonne National Laboratory under the sponsorship of the U.S. Department of Energy.
Date:
June 1989
Creator:
Waynert, J. A.; DeGregoria, A. J.; Foster, R. W. & Barclay, J. A.
Object Type:
Report
System:
The UNT Digital Library
[Letter from Julian Stanley to Manus Donahue, June 13, 1989]
Letter from Julian Stanley to Manus Donahue, on June 13, 1989, welcoming him to the administrative team of the Texas Academy of Mathematics and Science, and offering a few suggestions on expanding opportunities for the students.
Date:
June 13, 1989
Creator:
Stanley, Julian C.
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Julian Stanley to Rogers Redding, June 6, 1989]
Letter from Julian Stanley to Rogers Redding, on June 6, 1989, suggesting that the minimum number of credits needed for graduation be set at 48, to ease pressure from the students.
Date:
June 6, 1989
Creator:
Stanley, Julian C.
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Ann Lupkowski to Rogers Redding, June 14, 1989]
Letter from Ann Lupkowski to Rogers Redding, on June 14, 1989, congratulating him on receiving funding for the Texas Academy of Mathematics and Science from the Texas Legislature, and offering a list of projects she hopes to undertake when she begins work at the University of North Texas.
Date:
June 14, 1989
Creator:
Lupkowski, Ann E.
Object Type:
Letter
System:
The UNT Digital Library
[Photograph 2012.201.B0142.0270]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Jennifer Cook Lewis, Scott Cook and Ed Cook, standing from left, and Lelia Hahn Cook and Kaye Cook, seated, at the reception to honor Ed Cook, Casady School's Distinguished Graduate."
Date:
June 16, 1989
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0142.0279]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Kaye Cook, left, and Nancy deCordova at the shower."
Date:
June 16, 1989
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History