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1,635 Matching Results
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2 + 1 dimensional quantum gravity and the braid group
This paper discusses the following on quantum gravity: 2 + 1 gravity as a Chern-Simons theory; quantization; dynamics; the Braid group; and the emergence of space and time. 16 refs., 3 figs. (LSP)
Date:
October 1, 1989
Creator:
Carlip, S.
Object Type:
Article
System:
The UNT Digital Library
65 Minutes, October-December 1989
Bimonthly newsletter of Denton Boy Scout Troop 65 containing a list of upcoming events, news and announcements, and other information for members.
Date:
October 1989
Creator:
Boy Scouts of America. Troop 65 (Denton, Tex.)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
324 and 325 Building hot cell cleanout program: Decontamination of C-Cell
During FY 1989 the decontamination of C-Cell of Hanford's 324 Building was completed as part of the 324 and 325 Building Hot Cell Cleanout Program sponsored by the DOE Nuclear Energy's Surplus Facilities Management Program. The decontamination effort was completed using a series of remote and contact decontamination techniques. Initial radiation readings in C-Cell averaged 50 rad/hr and were reduced remotely to less than 200 mrad/hr using an alkaline foam cleaner followed by a 5000-psi water flush. Contact decontamination was then permissible using ultra high-pressure water, at 36,000 psi, further reducing the average radiation level in the cell to less than 86 mrem/hr. The approach used in decontaminating C-Cell resulted in a savings in radiation exposure of 87% and a cost savings of 39% compared to a hands-on procedure used in A-Cell, 324 Building in 1987. The radiation dose and the costs to achieve a 244-fold reduction in radiation contamination were 1.65 mrem per ft{sup 2} and $96 per ft{sup 2} of cell surface area. 14 figs., 4 tabs.
Date:
October 1, 1989
Creator:
Katayama, Y.B. & Holton, L.K. Jr.
Object Type:
Report
System:
The UNT Digital Library
The Active Personnel Dosimeter: Apfel Enterprises superheated drop detector
The Active Personnel Dosimeter (APD) provides a digital readout of events caused by neutrons interacting with superheated liquid droplets. The droplets are suspended in a gel held in a replaceable cartridge. Upon neutron interaction, the superheated droplet vaporizes, forming a bubble. The sound produced in this process is recorded by transducers that sense the accompanying pressure pulse. The APD electronically discriminates against spurious noise and vibration. Studies with the production prototype APDs indicate that the detector response is linear up to about 0.40 mSv, with large variations sometimes from predicted values and between cartridges at higher dose equivalents. The response to standard neutron sources (bare {sup 252}Cf, PuBe, PuB, PuF, PuLi) is reported and compared with the expected response. Unirradiated cartridges self-nucleate when heated to temperatures of 46{degree}C. The APD is insensitive to low-energy photons but responds to high-energy photons and electrons. 9 refs., 2 figs., 3 tabs.
Date:
October 1, 1989
Creator:
Ipe, N. E.; Donahue, R. J. & Busick, D. D.
Object Type:
Article
System:
The UNT Digital Library
Advanced spectroscopic analysis of coal surfaces during beneficiation
Preliminary FTIR spectra are reported on coals undergoing flotation where enhanced recovery was achieved by ultrasonic or chemical treatments. The spectra of sonicated coals indicate that ultrasonic treatment (10 kHz Swen Sonic) reduces the surface oxidation of heavily oxidized coal. Spectra of chemically treated coal indicate that a higher mineral concentration is present on or near the surface of float coal suggesting that a slime might be present. Spectra are reported for coal-, mineral-, and crystal-derived pyrite which show a strong absorbance band at 420 cm{sup {minus}1}. Spectra of eight Argonne Premium Coal Library specimens have been examined in the 420 cm{sup {minus}1} spectral region and are found to have numerous overlapping bands. 4 figs.
Date:
October 1, 1989
Creator:
McClelland, J.F. & Oh, J.S.
Object Type:
Report
System:
The UNT Digital Library
The Age, Volume [10], Number 10, October 1989
Monthly publication containing information related to Chambers County, Texas, including current events of the Chambers County Historical Commission, the Wallisville Heritage Park, and the Chambers County historical and genealogical societies; reprinted newspaper articles about county events and citizens; and historical news and records.
Date:
October 1989
Creator:
Wallisville Heritage Park (Organization)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Allen American (Allen, Tex.), Vol. 20, No. 79, Ed. 1 Sunday, October 1, 1989
Semiweekly newspaper from Allen, Texas that includes local, state, and national news along with advertising.
Date:
October 1, 1989
Creator:
Warnken, Mark
Object Type:
Newspaper
System:
The Portal to Texas History
[Allen-Paul House]
Photograph of the Allen-Paul House in Houston, Texas.
Date:
October 1, 1989
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
Altus Times (Altus, Okla.), Vol. 67, No. 235, Ed. 1 Sunday, October 1, 1989
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 1, 1989
Creator:
Lomenick, Rick
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Aluminum-lithium target behavior
Information on physical properties and irradiation behavior of aluminum-lithium target alloys employed for the production of tritium in Savannah River reactors has been reviewed to support development of technology for the New Production Reactor (NPR). Phase compositions and microstructures, thermal conductivity, mechanical properties, and constituent diffusion phenomena of the alloys, established in prior site studies, are presented. Irradiation behavior, including distributions of product tritium and helium and related exposure limits due to swelling and cracking of the target alloys is discussed, along with gas release processes occurring during subsequent product recovery operations. The property review supports designation of the aluminum-lithium alloys as ideally well-suited target materials for low-temperature, tritium-producing reactors, demonstrated over 35 years of Savannah River reactor operation. Low temperature irradiation and reaction with lithium in the alloy promotes tritium retention during reactor exposure, and the aluminum provides a matrix from which the product is readily recovered on heating following irradiation. 33 refs., 26 figs., 8 tabs.
Date:
October 1, 1989
Creator:
McDonell, W.R.
Object Type:
Report
System:
The UNT Digital Library
Ambiguities in the elastic scattering of 8 MeV neutrons from adjacent nuclei
Ratios of the cross sections for elastic scattering of 8 MeV neutrons from adjacent nuclei are measured over the angular range {approx}20{degree} {minus} 160{degree} for the target pairs {sup 51}V/Cr, {sup 59}Co/{sup 58}Ni, Cu/Zn, {sup 89}Y/{sup 93}Nb, {sup 89}Y/Zr, {sup 93}Nb/Zr, In/Cd and {sup 209}Bi/Pb. The observed ratios vary from unity by as much as a factor of {approx}2 at some angles for the lighter target pairs. Approximately half the measured ratios are reasonably explained by a simple spherical optical model, including size and isospin contributions. In all cases, the geometry of the real optical--model potential is essentially the same for neighboring nuclei, and the real--potential strengths are consistent with the Lane model. In contrast, it is found that the imaginary potential may be quite different for adjacent nuclei, and the nature of this difference is examined. It is shown that the spin--spin interaction has a negligible effect on the calculation of the elastic--scattering ratios, but that channel coupling, leading to a large reorientation of the target ground state, can be a consideration, particularly in the {sup 59}Co/{sup 58}Ni case. In the A {approx} 50--60 region the calculated ratios are sensitive to spin--orbit effects, but the exact nature of this …
Date:
October 1, 1989
Creator:
Smith, A. B.; Lawson, R. D. & Guenther, P. T.
Object Type:
Report
System:
The UNT Digital Library
Analysis of the hydraulic data from the MI fracture zone at the Grimsel Rock Laboratory, Switzerland
One of the major problems in analyzing flow and transport in fractured rock is that the flow may be largely confined to a poorly connected network of fractures. In order to overcome some of this problem, Lawrence Berkeley Laboratory (LBL) has been developing a new type of fracture hydrology model called an equivalent discontinuum model. In this model the authors represent the discontinuous nature of the problem through flow on a partially filled lattice. A key component in constructing an equivalent discontinuum model from this lattice is removing some of the conductive elements such that the system is partially connected in the same manner as the fracture network. This is done through a statistical inverse technique called simulated annealing. The fracture network model is annealed by continually modifying a base model, or template such that the modified systems behave more and more like the observed system. In order to see how the simulated annealing algorithm works, the authors have developed a series of synthetic real cases. In these cases, the real system is completely known so that the results of annealing to steady state data can be evaluated absolutely. The effect of the starting configuration has been studied by varying …
Date:
October 1, 1989
Creator:
Davey, A.; Karasaki, K.; Long, J.C.S.; Landsfeld, M.; Mensch, A. & Martel, S.J.
Object Type:
Report
System:
The UNT Digital Library
Analysis of tracer and thermal transients during reinjection
This work studied tracer and thermal transients during reinjection in geothermal reserviors and developed a new technique which combines the results from interwell tracer tests and thermal injection-backflow tests to estimate the thermal breakthrough times. Tracer tests are essential to determine the degree of connectivity between the injection wells and the producing wells. To analyze the tracer return profiles quantitatively, we employed three mathematical models namely, the convection-dispersion (CD) model, matrix diffusion (MD) model, and the Avodnin (AD) model, which were developed to study tracer and heat transport in a single vertical fracture. We considered three types of tracer tests namely, interwell tracer tests without recirculation, interwell tracer tests with recirculation, and injection-backflow tracer tests. To estimate the model parameters, we used a nonlinear regression program to match tracer return profiles to the solutions.
Date:
October 1, 1989
Creator:
Kocabas, I.
Object Type:
Report
System:
The UNT Digital Library
Analysis of tracer and thermal transients during reinjection
This work studied tracer and thermal transients during reinjection in geothermal reserviors and developed a new technique which combines the results from interwell tracer tests and thermal injection-backflow tests to estimate the thermal breakthrough times. Tracer tests are essential to determine the degree of connectivity between the injection wells and the producing wells. To analyze the tracer return profiles quantitatively, we employed three mathematical models namely, the convection-dispersion (CD) model, matrix diffusion (MD) model, and the Avodnin (AD) model, which were developed to study tracer and heat transport in a single vertical fracture. We considered three types of tracer tests namely, interwell tracer tests without recirculation, interwell tracer tests with recirculation, and injection-backflow tracer tests. To estimate the model parameters, we used a nonlinear regression program to match tracer return profiles to the solutions.
Date:
October 1, 1989
Creator:
Kocabas, I.
Object Type:
Report
System:
The UNT Digital Library
Analysis, Volume 10, Number 10, October 1989
Periodic newsletter discussing information related to legislation, state finance, and other topics related to Texas government. This issue focuses on amendments in an upcoming ballot.
Date:
October 1989
Creator:
Texas Research League
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Aquifer Characterization at the General Motors Harrison Division Plant, Tuscaloosa, Alabama
The General Motors corporation is studying the feasibility of aquifer thermal energy storage (ATES) for cooling purposes at its Harrison Division plant Tuscaloosa, Alabama. To determine the characteristics of the aquifer underlying the plant, the Pacific Northwest Laboratory (PNL) gathered information about the environment of the aquifer and conducted tests to determine the aquifer's transmissivity and flow. From these tests, calculated estimates of ground-water velocity and flow direction were made. Nine wells were drilled at the plant site. Apparently, a confining bed of clay locally divides the aquifer into two separate units, one confined and one unconfined. An initial attempt to determine the hydraulic gradient in the aquifer was complicated by the resulting discrepancies in water levels among wells as well as by offsite pumping of the same aquifer; however, an estimate of the direction and magnitude of the hydraulic gradient for the composite aquifer was made. Two other types of tests successfully provided data for ground-water flow velocity for ATES design. A constant-discharge and recovery test was conducted to determine transmissivity (hydraulic conductivity). A single-well tracer test was also conducted, and results of the two tests were used conjunctively to estimate ground-water flow velocity. Transmissivity was found to be …
Date:
October 1, 1989
Creator:
Luttrell, S. P.; Cronin, W. E. & Hall, S. H.
Object Type:
Report
System:
The UNT Digital Library
Aquifer Characterization at the Veterans Administration Hospital, Tuscaloosa, Alabama
The Veterans Administration (VA) is studying the feasibility of aquifer thermal storage (ATES) at their Tuscaloosa, Alabama, facility. To determine the characteristics of the aquifer underlying the facility, the Pacific Northwest Laboratory gathered information about the environment of the aquifer and conducted tests to estimate the aquifer's transmissivity, ground-water flow direction, and velocity. Seven wells were drilled at the VA site. It was found that ground-water flow direction at the site is generally toward the southwest. The magnitude of the gradient is approximately 2.5 {times} 10{sup -3} to 3 {times} 10{sup -3} ft/ft. For six of the seven wells, clay lenses or thick clay layers appear to be acting locally as confining or semi-confining layers. Three types of test were conducted at the site: a step drawdown test, a constant discharge and recover test, and a single-well tracer test. The data yielded responses suggesting leaky confined or delayed yield models for the aquifer. Drawdown and recovery versus time were matched type curves for delayed yield to obtain estimates of transmissivity and storage. This recovery method gave the best fit to the drawdown-versus-time curves. Using this method it was found that transmissivity ranged from 500 to 9000 ft{sup 2}/day and storage …
Date:
October 1, 1989
Creator:
Cronin, W. E.; Luttrell, S. P. & Hall, S. H.
Object Type:
Report
System:
The UNT Digital Library
The ARIES tokamak reactor study
The ARIES study is a community effort to develop several visions of tokamaks as fusion power reactors. The aims are to determine the potential economics, safety, and environmental features of a range of possible tokamak reactors, and to identify physics and technology areas with the highest leverage for achieving the best tokamak reactor. Three ARIES visions are planned, each having a different degree of extrapolation from the present data base in physics and technology. The ARIES-I design assumes a minimum extrapolation from current tokamak physics (e.g., 1st stability) and incorporates technological advances that can be available in the next 20 to 30 years. ARIES-II is a DT-burning tokamak which would operate at a higher beta in the 2nd MHD stability regime. It employs both potential advances in the physics and expected advances in technology and engineering. ARIES-II will examine the potential of the tokamak and the D{sup 3}He fuel cycle. This report is a collection of 14 papers on the results of the ARIES study which were presented at the IEEE 13th Symposium on Fusion Engineering (October 2-6, 1989, Knoxville, TN). This collection describes the ARIES research effort, with emphasis on the ARIES-I design, summarizing the major results, the key …
Date:
October 1, 1989
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
An assessment of criticality safety at the Department of Energy Rocky Flats Plant, Golden, Colorado, July--September 1989
This is a report on the 1989 independent Criticality Safety Assessment of the Rocky Flats Plant, primarily in response to public concerns that nuclear criticality accidents involving plutonium may have occurred at this nuclear weapon component fabrication and processing plant. The report evaluates environmental issues, fissile material storage practices, ventilation system problem areas, and criticality safety practices. While no evidence of a criticality accident was found, several recommendations are made for criticality safety improvements. 9 tabs.
Date:
1989-10~
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Assessment of the Fishery Improvement Opportunities on the Pend Oreille River, 1988 Annual Report.
The purpose of this study is to assess the fishery improvement opportunities on the Box Canyon portion of the Pend Oreille River. This report contains the findings of the first year of the study. Chinook salmon (Oncorhynchus tshawytscha (Walbaum)) and steelhead (Oncorhynchus mykiss (Richardson)) were present in the Pend Oreille River prior to the construction of Grand Coulee Dam. The river also contained native cutthroat trout (Oncorhynchus clarki (Richardson)), bull trout (Salvelinus confluentus (Walbaum)) and mountain whitefish (Prosopium williamsoni (Girard)). Rainbow trout were planted in the river and some grew to lengths in excess of 30 inches. With the construction of Box Canyon Dam, in 1955, the most productive section of the river was inundated. Following the construction of the dam the trout fishery declined and the populations of spiny ray fish and rough fish increased. The objectives of the first year of the study were to determine the relative abundance of each species in the river and sloughs; the population levels in fish in the river and four selected tributaries; fish growth rates; the feeding habits and abundance of preferred prey; the migration patterns; and the total fishing pressure, catch per unit effort, and total harvest by conducting a …
Date:
October 1, 1989
Creator:
Barber, Michael R.; Willms, Roger A. & Scholz, Allan T.
Object Type:
Report
System:
The UNT Digital Library
Assessment of the Fishery Improvement Opportunities on the Pend Oreille River, Appendices for 1988 Annual Report.
None
Date:
October 1, 1989
Creator:
Barber, Michael R.; Willms, Roger A. & Scholz, Allan T.
Object Type:
Report
System:
The UNT Digital Library
Attorney General's Criminal Law Update, October 1989
Monthly publication of the Attorney General of Texas for criminal justice professionals containing articles about legal issues as well as updates to Texas law; cases, opinions, and decisions made by the Attorney General; and other relevant news or discussion..
Date:
October 1989
Creator:
Texas. Attorney-General's Office.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
B-Factory Final Focus System using superconducting quadrupoles
Experience with the superconducting final focus quadrupoles for the SLAC Linear Collider can be applied to a B-Factory built into the existing CESR tunnel. Such a system appears to accommodate detector and machine requirements. 4 figs., 2 tabs.
Date:
October 1, 1989
Creator:
Ash, W.W.
Object Type:
Article
System:
The UNT Digital Library
B physics at the Z sup 0 pole
The SLC has been running at SLAC since April, and more than 100 Z{sup 0} events have been reconstructed. Shortly the new European facility at CERN-LEP-will also turn on, and by the end of the year we anticipate that more than 10,000 Z{sup 0} events will have been registered by each of the four LEP detectors. Most of the experimental facilities at these two machines are equipped with excellent particle tracking and identification. Some have close-in tracking devices which will provide unparalleled precision in trajectory reconstruction, and lead to the possibility of identifying a large proportion of the charmed and beauty particles. Not only does the Z{sup 0} pole offer a relatively large production cross section for e{sup +}e{sup {minus}} machines, but a large proportion of the events are b{bar b} pairs. One sees from this figure that a gain of six or more is obtained from running at the Z{sup 0}. An SLC producing 10{sup 5} events per year yields 20,000 b{bar b} events. Similarly, for LEP, over 200,000 b{bar b} events will become available per year. In addition, the planned upgrade for LEP will increase its luminosity by about an order of magnitude, and the SLC will run …
Date:
October 1, 1989
Creator:
Atwood, W. B. & Mours, Benoit
Object Type:
Article
System:
The UNT Digital Library