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2. 05 x 10/sup 9/ age of the Oklo uranium deposit
U and Pb isotopic data on samples (10 to 100 gram) 2 to 10 m away from the borders of the Oklo reactor zones indicate a primary age of 2.05 x 10/sup 9/ years for the Oklo deposit and a secondary age of 0.375 x 10/sup 9/ years. All samples show effects of Pb loss; the average loss is 50 percent. Both the U--Pb and Pb isotopic data are consistent with a model of a primary 2.05 x 10/sup 9/ year age of the deposit, continuous volume diffusion of Pb from uraninite, and either continuous or recent loss of this Pb. In this case the 0.375 x 10/sup 9/ year age is an artifact without time significance. Using an average value of D/a/sup 2/ 3.5 x 10/sup -11/ a/sup -1/ (Cowan, this conference) this model explains the apparent 1.8 x 10/sup 9/ year Pb age observed by other workers. From the /sup 208/Pb//sup 206/Pb data the average U/Th value calculated for the Oklo deposit is approximately 100.
Date:
January 1, 1977
Creator:
Gancarz, A. J.
Object Type:
Article
System:
The UNT Digital Library
2-mm microwave interferometer
A 2-mm microwave interferometer has been developed, and phase shift measurements have been made on the Baseball II experiment. The interferometer system employs a 140-GHz receiver for double down conversion of the plasma signal to a 60-MHz, IF frequency. The 140-GHz references signal is also down-converted and compared with the plasma signal to provide the desired phase change of the signal passing through the plasma. A feedback voltage from a 60-MHz discriminator to a voltage-controlled oscillator in the receiver provides frequency stability of the 60-MHz IF signals.
Date:
March 1, 1977
Creator:
Futch, A. H. & Mortensen, W. K.
Object Type:
Report
System:
The UNT Digital Library
2-MW plasmajet facility thermal tests of concrete. [PWR and BWR]
A test was made in the 2-Megawatt Plasmajet Facility to obtain experimental data relative to the thermal response of concrete to incident heat flux. 14.6 cm diameter by 8.0 cm long concrete cylinders were positioned in a supersonic flow of heated nitrogen from an arc heater. The end of the concrete cylinders impacted by the flow were subjected to heat fluxes in the range of 0.13 to 0.35 kW/cm/sup 2/. Measurements included cold wall surface heat flux and pressure distributions, surface and indepth temperatures, ablation rates, and surface emission spectrographs. The test was part of the Sandia light water reactor safety research program and complements similar tests made in the Radiant Heat Facility at heat fluxes from 0.03 to 0.12 kW/cm/sup 2/. A description of the tests and a tabulation of test data are included.
Date:
July 1, 1977
Creator:
Goin, Kenneth L.
Object Type:
Report
System:
The UNT Digital Library
3-D nonlinear evolution of MHD instabilities
The nonlinear evolution of ideal MHD internal instabilities is investigated in straight cylindrical geometry by means of a 3-D initial-value computer code. These instabilities are characterized by pairs of velocity vortex cells rolling off each other and helically twisted down the plasma column. The cells persist until the poloidal velocity saturates at a few tenths of the Alfven velocity. The nonlinear phase is characterized by convection around these essentially fixed vortex cells. For example, the initially centrally peaked temperature profile is convected out and around to form an annulus of high temperature surrounding a small region of lower temperature. Weak, centrally localized instabilities do not alter the edge of the plasma. Strong, large-scale instabilities, resulting from a stronger longitudinal equilibrium current, drive the plasma against the wall. After three examples of instability are analyzed in detail, the numerical methods and their verification are discussed.
Date:
March 1, 1977
Creator:
Bateman, G.; Hicks, H. R. & Wooten, J. W.
Object Type:
Report
System:
The UNT Digital Library
The 4-County News Bulletin (Castroville, Tex.), Vol. 19, No. 17, Ed. 1 Monday, August 1, 1977
Weekly newspaper from Castroville, Texas that includes local, state, and national news along with extensive advertising.
Date:
August 1, 1977
Creator:
Schott, Bobbie
Object Type:
Newspaper
System:
The Portal to Texas History
40 kW of solar cell modules for the Large Scale Production Task, a Low Cost Silicon Solar Array Project. Final technical report
Forty kilowatts of solar cell modules was produced in this program. This is equivalent to 4123 modules. The average power output per module was 9.7 watts at 16.5 volts, 60/sup 0/C and 100 mW/cm/sup 2/. The peak production rate was 200 modules per week which is equal to 1.9 kW per week. This rate was sustained for over four and one-half months and is equivalent to 100 kW per year. The solar cell module design, electrical and power performance, module preproduction environmental test results, production and shipping schedule, program summary, and delivery are described. A cost analysis section is written. Particular emphasis on the percentage of labor and material utilized in constructing a solar cell module is presented. Also included are cost reduction recommendations. It was concluded from this program that volume production on the order of hundreds of kilowatts per year per company as a minimum is required to significantly reduce the price per watt for solar cell modules. Sensor Technology more than doubled its solar cell module manufacturing facilities since the completion of the JPL Block II procurement. Plans are being made for large scale expansion of our facilities to meet growing JPL/DOE procurements.
Date:
December 1, 1977
Creator:
Jones, G.T.
Object Type:
Report
System:
The UNT Digital Library
100 kJ ion beams for pellet implosions
Among DOE's goals for inertial confinement fusion is support of construction of a heavy ion facility for demonstration experiments on deuterium tritium (DT) pellets with ion beams of 25 to 100 kJ energy. Three accelerator laboratories (Argonne, Berkeley, and Brookhaven) are actively engaged in accelerator development toward this concept. Several accelerator systems which could meet the criteria for these demonstration experiments are analyzed and compared.
Date:
January 1, 1977
Creator:
Martin, R.L.
Object Type:
Article
System:
The UNT Digital Library
150-m measurement of 0. 880- to 100. 0-keV neutron transmissions through four samples of /sup 238/U
In order to study the /sup 238/U + n total cross section, neutron transmissions through 0.076-, 0.254-, 1.080-, and 3.620-cm-thick samples of isotopically enriched /sup 238/U have been measured from 0.880 to 100.0 keV using a time-of-flight technique over a path length of 150 meters with the ORELA pulsed source and a 13-mm-thick Li-glass detector. The measurement is described in detail and both a listing and figures of the resulting transmissions are given. An absolute energy scale accurate to 2 parts in 10,000 was established.
Date:
October 1, 1977
Creator:
Olsen, D. K.; de Saussure, G.; Perez, R. B.; Difilippo, F. C.; Ingle, R. W. & Weaver, H.
Object Type:
Report
System:
The UNT Digital Library
250 keV resonance in the total neutron cross section of /sup 6/Li
The energy of the observed maximum of the 250 keV resonance in the total neutron cross section of /sup 6/Li is measured to be 244.5 +- 1 keV relative to the velocity of light. The observed peak magnitude is 11.20 +- 0.20 b.
Date:
June 1, 1977
Creator:
Smith, A. B.; Guenther, P.; Havel, D. & Whalen, J. F.
Object Type:
Report
System:
The UNT Digital Library
12G: code for conversion of isotope-ordered cross-section libraries into group-ordered cross-section libraries
Many current reactor physics codes accept cross-section libraries in an isotope-ordered form, convert them with internal preprocessing routines to a group-ordered form, and then perform calculations using these group-ordered data. Occasionally, because of storage and time limitations, the preprocessing routines in these codes cannot convert very large multigroup isotope-ordered libraries. For this reason, the I2G code, i.e., ISOTXS to GRUPXS, was written to convert externally isotope-ordered cross section libraries in the standard file format called ISOTXS to group-ordered libraries in the standard format called GRUPXS. This code uses standardized multilevel data management routines which establish a strategy for the efficient conversion of large libraries. The I2G code is exportable contingent on access to, and an intimate familiarization with, the multilevel routines. These routines are machine dependent, and therefore must be provided by the importing facility. 6 figures, 3 tables.
Date:
September 1, 1977
Creator:
Resnik, W. M. II & Bosler, G. E.
Object Type:
Report
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 7, No. 1, Ed. 1 Thursday, September 1, 1977
Newspaper from Oscar Rose Junior College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
September 1, 1977
Creator:
Legg, Ginny
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
16th nuclear engineering education conference on international nuclear engineering: development and planning
Separate abstracts were prepared for the ten summaries, dealing with various energy and nuclear topics. (DLC)
Date:
January 1, 1977
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
1972 preliminary safety analysis report based on a conceptual design of a proposed repository in Kansas
This preliminary safety analysis report is based on a proposed Federal Repository at Lyons, Kansas, for receiving, handling, and depositing radioactive solid wastes in bedded salt during the remainder of this century. The safety analysis applies to a hypothetical site in central Kansas identical to the Lyons site, except that it is free of nearby salt solution-mining operations and bore holes that cannot be plugged to Repository specifications. This PSAR contains much information that also appears in the conceptual design report. Much of the geological-hydrological information was gathered in the Lyons area. This report is organized in 16 sections: considerations leading to the proposed Repository, design requirements and criteria, a description of the Lyons site and its environs, land improvements, support facilities, utilities, different impacts of Repository operations, safety analysis, design confirmation program, operational management, requirements for eventually decommissioning the facility, design criteria for protection from severe natural events, and the proposed program of experimental investigations. (DLC)
Date:
August 1, 1977
Creator:
Blomeke, J. O.
Object Type:
Report
System:
The UNT Digital Library
1974 conceptual design description of a bedded salt pilot plant in southeast New Mexico
The policy of the United States Atomic Energy Commission is to take custody of all commercial high-level radioactive wastes and maintain control of them in perpetuity. This policy (Title 10, Code of Federal Regulations, Part 50, Appendix F) requires that the high-level wastes from nuclear fuels reprocessing plants be solidified within five years after reprocessing and then shipped to a federal repository within ten years after reprocessing. Ultimate disposal sites and/or methods have not yet been selected and are not expected to be ready when waste deliveries begin about 1983. Therefore, the AEC plans to build an interim storage facility, called Retrievable Surface Storage Facility (RSSF), to store and isolate the waste from man and his environment until the suitability of the permanent repository is demonstrated and public acceptance has been established. Meantime, the AEC is proceeding with the study and development of an ultimate disposal method. Bedded salt is being considered for ultimate waste disposal, and work is in progress to develop a Bedded Salt Pilot Plant to demonstrate its acceptability. The pilot plant will permit in situ verification of laboratory work on the interaction of heat and radioactivity of the waste with the salt and surroundings. One concept …
Date:
June 1, 1977
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
1976 Energy Resource Alternatives II Competition. Final report
Descriptions of all the entries in the competition are presented. Competition rules and judging procedures are described. Entries consisted of team efforts from colleges and universities. The competition called for the student teams to develop means for producing electrical power sufficient to meet the needs of a single family home, using an energy source other than oil or natural gas. The electric power produced had to be economically realistic when compared to present energy sources.
Date:
October 1, 1977
Creator:
McGill, Robert A.; Iannucilli, Mary; Marshal, James; Sununu, John H.; Eschbach, Joseph E.; Anson, Jon et al.
Object Type:
Report
System:
The UNT Digital Library
1976 environmental monitoring report
The environmental levels of radioactivity and other environmental pollutants found in the vicinity of Brookhaven National Laboratory during 1976 are summarized. As an aid in the interpretation of the data, the amounts of radioactivity and other pollutants released in airborne and liquid effluents from Laboratory facilities to the environment are also indicated. The environmental data includes external radiation levels; radioactive air particulates; tritium and iodine concentrations; the amounts and concentrations of radioactivity in precipitation; the amounts and concentrations of radioactivity in and the quality of the stream into which liquid effluents are released; the concentrations of radioactivity in sediments and biota from the stream; the concentrations of radioactivity in and the quality of ground waters underlying the Laboratory; and concentrations of radioactivity in milk, grass, and soil samples obtained in the vicinity of the Laboratory. The external radiation level for 1976 at the north boundary of the Laboratory attributable to an ecology forest irradiation source was 74.4 mrem, or 14 percent of the applicable Radiation Protection Standard.
Date:
April 1, 1977
Creator:
Naidu, J. R.
Object Type:
Report
System:
The UNT Digital Library
1977 breeding bird censuses and vegetation surveys in two successional stages of oak--pine forest
As part of a program to characterize the plant and animal life of the Laboratory site and surrounding areas, two breeding bird census plots were established in 1977 to document the occurrence and abundance of breeding species in two extreme successional stages of Long Island oak-pine forest. A 9.3-hectare plot located near the northeastern corner of the Laboratory site is composed of second growth oak-pine forest in a late successional stage. The second plot measures 9.7 hectares and is located in the scrub oak-pitch pine barrens at Westhampton. Each plot was surveyed with a transit and steel tape and marked with wooden stakes at 100-foot intervals. Quantitative vegetational surveys were made in each plot and all plant species identified. Tree composition was measured as a function of species and size. Shrub density, percent of ground cover and percent of canopy were also measured. The Laboratory plot contained 2100 trees of five species per hectare, 72% ground cover and 84% canopy coverage. The Westhampton plot contained only one tree species, Pitch Pine, at 366 trees per hectare, 92% ground cover and no canopy. Twelve census trips, mostly of two to three hour duration, were made in each plot. Each bird observed …
Date:
December 1, 1977
Creator:
Raynor, G. S.; Ruscica, J. J.; Clinton, J. H. & Larsen, D. L.
Object Type:
Report
System:
The UNT Digital Library
THE 3d2 - 3d4f TRANSITIONS IN V IV
The 3d4f levels in the spectrum of triply ionized vanadium, V IV, were located by L. Iglesias. She located these levels by identifying transitions from the 3d{sup 2} ground configuration to the 3d4p levels, then to the 3d4d levels and finally to the 3d4f levels. She also identified the transitions from the 3d4d levels to the 3d5p levels, continued up to the 3d5d levels, then back down to the 3d4f levels. Though the 3d4f levels were well established by two routes, the direct transitions from the ground state were not observed, being beyond her experimental range which stopped at 675 {angstrom}. We have photographed the spectrum of vanadium in the region of 190-650 {angstrom} and the direct transitions from 3d{sup 2} to 3d4f have been observed. The spectrum was excited with a vacuum sliding-spark discharge between vanadium metal electrodes separated by a quartz spacer as described previously. Peak discharge current was 1000 {angstrom}. The spectrum was photographed on Kodak SWR plates using the 10 {center_dot} 7 m grazing incidence spectrograph at the National Bureau of Standards in Washington, D.C. The plate factor in the region of interest is about 0.27 {angstrom}/mm. The plates were measured on a Grant comparator. Lines …
Date:
September 1, 1977
Creator:
Shalimoff, G. V. & Conway, J.G.
Object Type:
Article
System:
The UNT Digital Library
[A.A. Erhard House, (NE Oblique)]
Photograph of the A.A. Erhard House (located at 1106 Pecan) in Bastrop, Texas.
Date:
April 1, 1977
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
[T. A Hassler House, (W Elevation)]
Photograph of the T. A Hassler House (located at 1109 Pecan) in Bastrop, Texas.
Date:
April 1, 1977
Creator:
Texas Historical Commission
Object Type:
Photograph
System:
The Portal to Texas History
Ab initio calculations on hydrogen bonding in alcohols: dimers of CH/sub 3/OH, CH/sub 3/CH/sub 2/OH, and CF/sub 3/CH/sub 2/OH
Ab initio calculations on a series of alcohol dimers including (CH/sub 3/OH)/sub 2/, (CH/sub 3/CH/sub 2/OH)/sub 2/, and (CF/sub 3/CH/sub 2/OH)/sub 2/ have been carried out to compare the effects of various substituents on the hydrogen bond energies and structures and to correlate the results with the wealth of new experimental data on them. Calculations were done with the minimal STO-3G basis set. The methanol and ethanol dimers both have nearly linear hydrogen bonds. The ethanol dimer is also similar in energy to the methanol dimer. Dimers involving both the g-staggered and t-staggered isomers of 2,2,2 trifluoroethanol were considered. The g-staggered isomer is more stable than the t-staggered isomer by 0.7 kcal/mole and has an intramolecular bond. The dimer of the t-staggered isomer was found to have a linear hydrogen bond as in the methanol and ethanol dimers with a similar hydrogen bond energy. In contrast, the dimer of the g-staggered isomer has a cyclic structure which is more stable by about 0.5 kcal/mole. The results are consistent with experimental measurements of the gas phase enthalpies of association of alcohols.
Date:
January 1, 1977
Creator:
Curtiss, L. A.
Object Type:
Article
System:
The UNT Digital Library
Ab initio effective core potentials including relativistic effects and their application to the electronic structure calculations of heavy atoms and molecules
The effects of the 4f shell of electrons and the relativity of valence electrons are compared. The effect of 4f shell (lanthanide contraction) is estimated from the numerical Hartree-Fock (HF) calculations of pseudo-atoms corresponding to Hf, Re, Au, Hg, Tl, Pb and Bi without 4f electrons and with atomic numbers reduced by 14. The relativistic effect estimated from the numerical Dirac-Hartree-Fock (DHF) calculations of those atoms is comparable in the magnitude with that of the 4f shell of electrons. Both are larger for 6s than for 5d or 6p electrons. The various relativistic effects on valence electrons are discussed in detail to determine the proper level of the approximation for the valence electron calculations of systems with heavy elements. An effective core potential system has been developed for heavy atoms in which relativistic effects are included in the effective potentials.
Date:
November 1, 1977
Creator:
Lee, Y. S.
Object Type:
Report
System:
The UNT Digital Library
Ab Initio quantum mechanical characterization of the ground electronic state of benzo(a)pyrene. Implications for the mechanism of PAH oxidation to expoxides by cytochrome P-450
Electronic properties have an important role in the metabolism of benzo(a)pyrene (BP) and the mutagenic action of its metabolites. In this paper, the ground electronic state of BP is characterized by the ab initio molecular fragment floating spherical Gaussian orbital method, and a speculative structural-electronic mechanism is presented for the oxidation of PAHs to epoxides by cytochrome P-450.
Date:
January 1, 1977
Creator:
Shipman, L M
Object Type:
Article
System:
The UNT Digital Library
AC distribution system for TFTR pulsed loads
This paper outlines the AC distribution system associated with the Tokamak Fusion Test Reactor and discusses the significant areas related to design, protection, and equipment selection, particularly where there is a departure from normal utility and industrial applications.
Date:
January 1, 1977
Creator:
Carroll, R. F.; Ramakrishnan, S.; Lemmon, G. N. & Moo, W. I.
Object Type:
Article
System:
The UNT Digital Library