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Exploring novel silicon-containing polymers---From preceramic polymers to conducting polymers with nonlinear optical properties

Description: Several new types of silicon-containing preceramic polymers, i.e., poly(diorganosilacetylene) and poly(diorganosilvinylene) have been synthesized with molecular weights from 10,000 to 120,000. These polymers could be thermally converted to SiC with a moderate to high char yields. Ready solubility and good processability made these types of polymers attractive in their applications to ceramics. The thermal polymerization of diethynyldiphenyl-silane, which was reported in 1968 to afford poly(diph… more
Date: October 7, 1991
Creator: Pang, Yi.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An MS-DOS-based program for analyzing plutonium gamma-ray spectra

Description: A plutonium gamma-ray analysis system that operates on MS-DOS-based computers has been developed for the International Atomic Energy Agency (IAEA) to perform in-field analysis of plutonium gamma-ray spectra for plutonium isotopics. The user interacts with the system by means of menus and screens that allow the user to select various applications and to enter information pertinent to a measurement. This information, along with the plutonium weight-percent-abundance results from the data analysis… more
Date: September 7, 1989
Creator: Ruhter, W. D. & Buckley, W. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An MS-DOS-based program for analyzing plutonium gamma-ray spectra

Description: A plutonium gamma-ray analysis system that operates on MS-DOS-based computers has been developed for the International Atomic Energy Agency (IAEA) to perform in-field analysis of plutonium gamma-ray spectra for plutonium isotopics. The program titled IAEAPU consists of three separate applications: a data-transfer application for transferring spectral data from a CICERO multichannel analyzer to a binary data file, a data-analysis application to analyze plutonium gamma-ray spectra, for plutonium … more
Date: September 7, 1989
Creator: Ruhter, W. D. & Buckley, W. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An MS-DOS-based program for analyzing plutonium gamma-ray spectra

Description: A plutonium gamma-ray analysis system that operates on MS-DOS-based computers has been developed for the International Atomic Energy Agency (IAEA) to perform in-field analysis of plutonium gamma-ray spectra for plutonium isotopics. The program titled IAEAPU consists of three separate applications: (1) a data-transfer application for transferring spectral data from a CICERO multichannel analyzer to a binary data file, (2) a data-analysis application to analyze plutonium gamma-ray spectra for plu… more
Date: September 7, 1989
Creator: Ruhter, W. D. & Buckley, W. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Kilowatt isotope power system. Component test report for the ground demonstration system pump

Description: The purpose of this test was to demonstrate that the System Pump utilized for the developmental program to be conducted on the Kilowatt Isotope Power System (KIPS) fulfilled the requirements of Test Procedure 398, Component Test Procedure for the GDS System Pump. Results of the testing performed on the System Pump are presented.
Date: November 7, 1977
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Batch Kd measurements of nuclides to estimate migration potential at the proposed Waste Isolation Pilot Plant in New Mexico

Description: Laboratory measurements to determine the sorption distribution coefficients, Kd, of radionuclides present in, and potentially leached from, radioactive wastes, in contact with representative geologic media, have been conducted. The nuclides studied include Cs, Sr, Tc, Ru, Sb, Ce, Eu, Pu, Np, Cm, Am, U, and Pa. The crushed rock materials used were from the vicinity of the Waste Isolation Pilot Plant, a project to isolate radioactive wastes in a bedded salt facility, near Carlsbad, New Mexico. So… more
Date: October 7, 1977
Creator: Serne, R.J.; Rai, D.; Mason, M.J. & Molecke, M.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Testing of developmental neutral beam sources for MFTF

Description: The design of a four-grid, spherically-focused, 10-by-46-cm area accelerator and ion source for the Mirror Fusion Test Facility (MFTF) has been previously described. This source was designed to operate at 80 kV-80 A for 0.5 s, and along with a matching, three-grid 20-kV-100-A-10-ms accelerator, has been built and tested. The 80-kV source has operated beyond design specifications to 90 kV-90 A for 12 ms. Pulse duration was limited by a capacitor bank accelerator power supply. Tests to 0.5 s on t… more
Date: November 7, 1979
Creator: Molvik, A.W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Technical Safety Requirements for the B695 Segment of the Decontamination and Waste Treatment Facility

Description: This document contains Technical Safety Requirements (TSRs) for the Radioactive and Hazardous Waste Management (RHWM) Division's B695 Segment of the Decontamination and Waste Treatment Facility (DWTF) at Lawrence Livermore National Laboratory (LLNL). The TSRs constitute requirements regarding the safe operation of the B695 Segment of the DWTF. The TSRs are derived from the Documented Safety Analysis (DSA) for the B695 Segment of the DWTF (LLNL 2004). The analysis presented there determined that… more
Date: September 7, 2007
Creator: Larson, H L
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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ANALYTICAL METHOD FOR MEASURING TOTAL PROTIUM AND TOTAL DEUTERIUM IN A GAS MIXTURE CONTAINING H2, D2,AND HD VIA GAS CHAROMATOGRAPHY

Description: The most common analytical method of identifying and quantifying non-radioactive isotopic species of hydrogen is mass spectrometry. A low mass, high resolution mass spectrometer with adequate sensitivity and stability to identify and quantify hydrogen isotopes in the low ppm range is an expensive, complex instrument. A new analytical technique has been developed that measures both total protium (H) and total deuterium (D) in a gas mixture containing H{sub 2}, D{sub 2}, and HD using an inexpensi… more
Date: August 7, 2007
Creator: Sessions, H
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Flow of mantle fluids through the ductile lower crust: Heliumisotope trends

Description: Heat and mass are injected into the shallow crust when mantle fluids are able to flow through the ductile lower crust. Minimum 3He/4He ratios in surface fluids from the northern Basin and Range province, western North America increase systematically from low, crustal values in the east to high, mantle values in the west, a regional trend that correlates with the rates of active crustal deformation. The highest ratios occur where the extension and shear strain rates are greatest. The corresponde… more
Date: October 7, 2007
Creator: Kennedy, B. Mack & van Soest, Matthijs C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A technique for shell compression measurements of laser fusion targets by neutron activation of a rubidium tracer

Description: At the Nova Laser, the activation of a rubidium tracer incorporated in the shell of ICF targets has become a standard diagnostic technique for measuring the compressed shell areal density {l angle}{rho}{Delta}R{r angle}. The isotope {sup 85}Rb is activated by 14 MeV implosion neutrons to produce the isomer {sup 84m}Rb(t{sub {1/2}} = 20.5 min) which is used to determine the shell {l angle}{rho}{Delta}R{r angle} while the radioactive isotope {sup 86}Rb(t{sub 1/2} = 18.8 d) is used to determine th… more
Date: December 7, 1990
Creator: Lane, S.M. & Nelson, M.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Thick-target neutron and. gamma. -ray yields induced by medium-energy proton and deuteron bombardments

Description: Stopping samples of Lucite, Al, Fe, and /sup 238/U (Fe, and /sup 238/U) were irradiated with 330 MeV deuterons (260 MeV protons). For each target, neutron energy spectra and prompt ..gamma..-ray yields were measured using the time-of-flight technique. The detector was a right cylindrical volume of deuterated benzene, 12.5-cm diameter x 7.5-cm long, located at 110/sup 0/ to the incident beam direction. The neutron yield and the prompt ..gamma..-ray yield were found to depend upon the atomic numb… more
Date: March 7, 1979
Creator: Becker, J. A.; Howe, R. E.; Crase, K. W. & Farley, E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Tritium inventory of a target factor in an ICF power plant

Description: A preliminary parametric study has been performed to estimate the tritium inventory of a conjectured Target Factory. The inventory of a proposed tritiated fuel processing system was determined as a function of production efficiency, storage factor, and time interval for the slowest processing step. Results indicated that a study of this type will be beneficial in evaluating possible processing schemes for the production of tritiated laser fusion targets.
Date: May 7, 1981
Creator: Sherohman, J.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Plasma-Parameter Measurements Using Neutral-Particle-Beam Attenuation

Description: Intense and energetic neutral-particle-beam injection used for fueling or heating magnetically confined, controlled-fusion experimental plasmas can also provide diagnostic measurements of the plasmas. The attenuation of an atomic beam (mainly from charge-exchange and ionization interactions) when passing through a plasma gives the plasma line density. Orthogonal arrays of highly collimated detectors of the secondary-electron-emission type have been used in magnetic-mirror experiments to measure… more
Date: July 7, 1982
Creator: Foote, J. H.; Molvik, A. W. & Turner, W. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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SPR-9 concept definition study: FY 1986 summary

Description: This report summarizes the results of work undertaken to advance design of the SPR-9 MMW power reactor. Gas-cooled thermal reactors coupled with Brayton cycle power conversion appear feasible and have several attractive features for multi-megawatt space power systems. The high temperature capability of the reactor removes it as the limiting component on system performance. The low fuel inventories required make systems based on thermal reactors a lesser safeguard risk. However, an advanced radi… more
Date: October 7, 1986
Creator: Walter, C.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electromagnetic Research Division Quarterly Progress Report, Part I for Period Ending June 30, 1952

Description: From abstract: "On the 86-inch cyclotron a 41-kw beam has been calorimetered at a net ion loading efficiency of 40%; the average proton current was 1.85 ma at 22.5 Mev. Practical specific yields have been determined for (p,2n) reactions on zinc and bismuth. The investigation of products of proton-induced fission of uranium has been continued and new techniques are being used in measuring angular distribution of reaction products. The 63-inch heavy particle cyclotron is now in operation; N+++ pa… more
Date: March 7, 1957
Creator: Livingston, Robert S. & Howard, F. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Modeling level structures of odd-odd deformed nuclei

Description: A technique for modeling quasiparticle excitation energies and rotational parameters in odd-odd deformed nuclei has been applied to actinide species where new experimental data have been obtained by use of neutron-capture gamma-ray spectroscopy. The input parameters required for the calculation were derived from empirical data on single-particle excitations in neighboring odd-mass nuclei. Calculated configuration-specific values for the Gallagher-Moszkowski splittings were used. Calculated and … more
Date: September 7, 1984
Creator: Hoff, R.W.; Kern, J.; Piepenbring, R. & Boisson, J.P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fission barriers of hot rotating nuclei: Theoretical predictions and experimental tests

Description: Recent theoretical developments in calculating fission barriers of hot rotating nuclei and their experimental tests are reviewed. The discussions are limited to macroscopic fission models (no shell effects), since experimental tests come primarily from heavy-ion induced reactions involving large angular momenta and internal excitation energies. The physics of the rotating finite range models with temperature is emphasized and the predictions of our model are compared with those of other macrosc… more
Date: July 7, 1987
Creator: Mustafa, M.G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Uranium-series dating of pedogenic carbonates from the Livermore Valley, California

Description: A uranium-series dating technique has been applied to pedogenic carbonates from the Livermore Valley in California. The results from geomorphologically distinct Quaternary alluvial units are internally consistent and for one alluvial unit are corroborated by a concordant /sup 14/C age for an associated wood fragment. In appropriate situations, age dates for pedogenic carbonates derived using this technique may provide a time stratigraphy for alluvial units and hence provide some limits (minimum… more
Date: January 7, 1981
Creator: Knauss, K.G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effects of cyclotron radiation in magnetically-confined p-/sup 11/B reactors

Description: Confinement parameters, ntau, are calculated for several possible magnetically-confined p-/sup 11/B reactor configurations using a computer code that evaluates cyclotron radiation emission by electrons and follows the energy distributions of the reactants and products explicitly as they undergo nuclear reactions and both low and high angle scattering. The present treatment of cyclotron radiation assumes a uniform magnetic field and an isotropic plasma. Reflectivity is included as an input param… more
Date: November 7, 1975
Creator: Chu, T. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Extremely NA and CL Rich Chondrule AL3509 from the Allende Meteorite

Description: We report on the mineralogy, petrology, chemistry, oxygen isotopes, {sup 26}Al-{sup 26}Mg and {sup 36}Cl-{sup 36}S isotope systematics of the Allende chondrule Al3509 discovered and described by [1] and [2]. This spherical object ({approx}1cm {phi}) contains {approx}10% Na and 1% Cl, and nearly pure {sup 129}Xe [({sup 129}Xe/{sup 127}I) = 1.1 x 10{sup -4} (3)]. This high enrichment in halogens makes it of interest in searching for radiogenic {sup 36}S from {sup 36}Cl (t{sub 1/2} {approx} 0.3 Ma… more
Date: April 7, 2011
Creator: Wasserburg, G J; Hutcheon, I D; Aleon, J; Ramon, E C; Krot, A N; Nagashima, K et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Theoretical and observational review of results on nova explosions occurring on ONeMg white dwarfs

Description: The nova outburst is the second most violent explosion that occurs in a galaxy. This review presents the recent observational and theoretical studies that have demonstrated that there exist two classes of nova outburst. One type of nova occurs on a CO white dwarf and the other type of nova occurs on an ONeMg white dwarf. The second class of outbursts are much more violent and occur much more frequently then the first class of outbursts. Hydrodynamic simulations of both kinds of outbursts are in… more
Date: July 7, 1986
Creator: Starrfield, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Preparation of microspherical alpha-radiation sources. [/sup 238/Pu; /sup 22/Na]

Description: Sodium silicate glass microspheres in the 105-125 ..mu..m diameter size range, containing in vitreous solution the radioisotopes plutonium-238 and sodium-22, were prepared in four batches which emitted a nominal 40, 80, 320, and 640 nCi of total alpha radiation and approximately 1 nCi of gamma radiation form the sodium-22 isotope from each sphere. The initial integrity of the glasses was good and no wipeable contamination was detected from the spheres. The alpha particle range in the glass for … more
Date: May 7, 1976
Creator: Wittenberg, L. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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