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in subjects: "Organic Oxygen Compounds"  
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Application of advanced composites in tokamak magnet systems

Description: The use of advanced (high-modulus) composites in superconducting magnets for tokamak fusion reactors is discussed. The most prominent potential application is as the structure in the pulsed poloidal-field coil system, where a significant reduction in eddy currents could be achieved. Present low-temperature data on the advanced composites are reviewed briefly; they are too meager to do more than suggest a broad class of composites for a particular application.
Date: November 1, 1977
Creator: Long, C. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Shelf life determination of an epoxy resin by accelerated aging

Description: The objectives of the study reported were to first define the rate and mode of degradation of an epoxy resin at two storage conditions, 4.4/sup 0/C and 25/sup 0/C, by means of a thermally accelerated aging experiment. Then, samples which had been aged the equivalent of at least 10 years at each storage condition would be tested for conformance to the material specifications. The study's results demonstrate that the commercial resin could be acquired and stored for the required 10 to 11 years wi… more
Date: November 1, 1983
Creator: Smith, H.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Development of Electrochemical Photovoltaic Cells. Second Technical Progress Report, August 1, 1979-October 31, 1979

Description: The development of stable, efficient, photoelectrochemical cells based on silicon and gallium arsenide in non-aqueous electrolyte systems is being investigated. Redox reactions of ferrocene, anthracene and anthraquinone have been studied on platinum and n-silicon electrodes. The latter have been further characterized by differential capacitance measurements. Cells and equipment have been designed and set up for long-term stability studies.
Date: November 21, 1979
Creator: Austin, A. E.; Byker, H. J. & Brooman, E. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Methyltrihydroborate complexes of the lanthanides and actinides

Description: Reaction of MC1/sub 4/ (M = Zr, Hf, U, Th, Np) with LiBH/sub 3/CH/sub 3/ in chlorobenzene produces volatile, hexane-soluble M(BH/sub 3/CH/sub 3/)/sub 4/. Crystal structures are monomeric, tetrahedral species. Lewis base adducts prepared include U(BH/sub 3/CH/sub 3/)/sub 4/.THT, Th(BH/sub 3/CH/sub 3/)/sub 4/.L (L = THF (tetrahydrofuran), THT (tetrahydrothiophene), SMe/sub 2/, OMe/sub 2/), U(BH/sub 3/CH/sub 3/)/sub 4/.2L (L = THF, pyridine, NH/sub 3/), Th(BH/sub 3/CH/sub 3/)/sub 4/.2L (L = THF, T… more
Date: November 1, 1984
Creator: Shinomoto, R.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Unimolecular and bimolecular reactions induced by state-specific vibrational excitation

Description: Toward the goal of understanding the role of vibrational energy in chemical reactions related to energy production, we have made several advances. They include the understanding of chemical properties of highly vibrationally excited molecules, the characterization of vibrationally excited radicals, and the development of experimental techniques to extend our ability to investigate transient and reactive chemical species. 11 refs., 1 fig.
Date: November 1, 1991
Creator: Dai, Hai-Lung.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An experimental/analytical comparison of strains in encapsulated assemblies

Description: A combined experimental and analytical study of strains developed in encapsulated assemblies during casting, curing and thermal excursions is described. The experimental setup, designed to measure in situ strains, consisted of thin, closed-end, Kovar tubes that were instrumented with strain gages and thermocouples before being over-cast with a polymeric encapsulant. Four bisphenol A (three diethanolamine cured and one anhydride cured) epoxy-based materials and one urethane elastomeric material … more
Date: November 1, 1991
Creator: Guess, T.R. & Burchett, S.N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Stress-strain gage measurements on a Nevada Test Site (NTS) event using pairs of triple foil gages

Description: A triple-material stress-strain gage containing foils of ytterbium, manganin, and constantan was tested at LLNL. This gage yields three independent piezoresistance measurements from which an independent set of principal strains and principal stresses can be inferred. We have analyzed the signals from a gage at a specific location buried at a distance from the center of energy of an event at NTS. We inverted the resistivity signals to calculate the stress and strain histories as sensed by the fo… more
Date: November 30, 1990
Creator: Kansa, E. J. & Stout, R. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Energy transfer processes in solar energy conversion

Description: We have made substantial progress in experimental and theoretical studies in two areas: Photoinduced donor to acceptor electron transfer followed by back transfer in random solutions; and electronic excitation transport in systems with complex inhomogeneous spatial geometries and inhomogeneous energy distributions. Through the development of accurate statistical mechanical theories, we have been able to relate dynamics in complex systems to experimental observables. We have then used the experi… more
Date: November 1, 1989
Creator: Fayer, M.D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Organic insulators and the copper stabilizer for fusion-reactor magnets

Description: The materials which compose the large composite superconducting fusion reactor magnets are subjected to mechanical stress, neutron and gamma-ray radiation with broad energy spectra, high magnetic fields, and thermal cycling from 4 to 300 K. Of the materials now considered for use in the magnets, results show that the organic insulators and the Cu stabilizer are the most sensitive to this environment. In response to the need for stabilizer data, magnetoresistivity changes were studied in eight v… more
Date: November 1, 1981
Creator: Coltman, R.R. Jr.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Radiation effects on organic insulators for superconducting magnets. Annual progress report for period ending September 30, 1979

Description: The most recent efforts in a program to study the effects of irradiation near 5 K on organic insulators for fusion reactors have extended the irradiation dose from 2 x 10/sup 9/ to 1 x 10/sup 10/ rads and have studied additional effects due to fast neutrons. When added to a gamma-ray dose of 2.4 x 10/sup 9/ rads, a fast-neutron fluence of 2.4 x 10/sup 20/ n/m/sup 2/ has little effect upon changes in electrical and mechanical properties. At this dose, present results are in agreement with previo… more
Date: November 1, 1979
Creator: Coltman, R.R. Jr.; Klabunde, C.E.; Kernohan, R.H. & Long, C.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Enzymatic desulfurization of coal

Description: Our experimental approach focuses on the use of enzymes which catalyze the addition of oxygen to organic compounds. In tailoring the application of these enzymes to coal processing, we are particularly interested in ensuring that oxidation occurs at sulfur and not at carbon-carbon bonds. Previous studies with DBT have shown that the reaction most frequently observed in microbial oxidative pathways is one in which DBT is oxidized at ring carbons. These reactions, as we have said, are accompanied… more
Date: November 7, 1989
Creator: Boyer, Y.N.; Crooker, S.C.; Kitchell, J.P.; Nochur, S.V. (DynaGen, Inc., Cambridge, MA (United States)) & Marquis, J.K. (Boston Univ., MA (United States). School of Medicine)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High octane ethers from synthesis gas-derived alcohols. [Catalyst names: Amberlyst-15, BioRad AG 50WX2, Nafion-H microsaddles, and Purolite 150]

Description: The objective of the proposed research is to synthesize high octane ethers, primarily methyl isobuty ether (MIBE) and methyl tertiary butyl ether (MTBE), directly from H{sub 2}/CO/CO{sub 2} coal-derived synthesis gas via alcohol mixtures that are rich in methanol and 2-methyl-1-butanol (isobutanol). The overall scheme involves gasification of coal, purification and shifting of the synthesis gas, higher alcohol synthesis, and direct synthesis of ethers.
Date: November 1, 1991
Creator: Klier, K.; Herman, R. G.; Johannson, M.; Feeley, O. C.; Bogar, S.; Lawson, E. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Magnetic resonance studies of photo-induced electron transfer reactions

Description: Fourier Transform Electron Paramagnetic Resonance (FT EPR) is useful in study of photochemical reactions: a microwave pulse rotates the electron spin magnetization vector from z (magnetic field) into xy plane ([pi]/2 pulse); the time evolution of magnetization in xy plane, the free induction decay (FID), is sampled. Fourier transform of FID gives the frequency domain EPR spectrum of the free radicals, and the method is ideal for time-resolved studies of free radicals produced by pulsed-laser ex… more
Date: November 1, 1992
Creator: van Willigen, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Coal Liquefaction Process Streams Characterization and Evaluation: The Use of Selective Chemical Reactions and Carbon NMR Spectroscopy in the Speciation and Quantification of Oxygen Functional Groups in Coal Resids

Description: This study demonstrated the feasibility of using phase-transfer methylation reactions for the derivatization of hydroxyl functionalities and single-electron transfer reactions to cleave ether groups in distillation resid materials derived from direct coal liquefaction. [sup 13]C-NMR was used to analyze the reaction products. It was demonstrated that the techniques can be used to speciate and quantify about half of the oxygen in resids. The remaining half of the oxygen is presumed to be present … more
Date: November 1, 1992
Creator: Stock, L. M. & Cheng, C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Metal alkoxides: templates for organometallic chemistry and catalysis. Final technical report on DE FG 02-86ER13570

Description: The physical properties and chemical reactivities of a series of alkoxide, fluoroalkoxide and thiolate compounds of molybdenum and tungsten having M{triple_bond}M or M{triple_bond}N bonds have been examined which reveal the influence of the pi-donor properties of the ligands: RO > R{sub f}O{approx}RS. Single-site metal alkoxide catalysts for the ring-opening polymerization of lactides have been prepared for the metals magnesium, zinc, and aluminum.
Date: November 1, 2002
Creator: Chisholm, Malcolm H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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THE REACTION OF ALUMINUM HYDRIDE WITH 3d TRANSITION METAL HALIDES. Progress Report for March 17, 1955 to November 1, 1955

Description: The reactions of AlH/sub 3/ in ether and in tetrahydrofuran solution with anhydrous halides of Fe, Co, and Ni are described. Reactions were carried out anaerobically at room temperature and below. In all instances, finely divided black products were obtained, some of which may contain metal to hydrogen bonds. Analytical results are presented for more than forty reactions, and possible mechanisms are discussed in a preliminary way. Observations are reported on the magnetic behavior of the produc… more
Date: November 1, 1955
Creator: Rice, M.J. Jr.; Gibb, T.R.P. Jr. & Meloni, E.G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Methyl aryl ethers from coal liquids as gasoline extenders and octane improvers

Description: A mixture of methyl aryl ethers derived from the phenols present in direct liquefaction coal liquids shows considerable promise as a gasoline blending agent and octane improver. The mixture of methyl aryl ethers was blended at five volume percent with a commercial, unleaded gasoline. The properties and performance of the blend in a variety of laboratory and automotive tests is reported. The tests show that the mixture of methyl aryl ethers improves gasoline octane without degrading other gasoli… more
Date: November 1, 1980
Creator: Singerman, Gary M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Biodegradation of hazardous waste using white rot fungus: Project planning and concept development document

Description: The white rot fungus Phanerochaete chrysosporium has been shown to effectively degrade pollutants such as trichlorophenol, polychlorinated biphenyls (PCBs), dioxins and other halogenated aromatic compounds. These refractory organic compounds and many others have been identified in the tank waste, groundwater and soil of various US Department of Energy (DOE) sites. The treatment of these refractory organic compounds has been identified as a high priority for DOE's Research, Development, Demonstr… more
Date: November 1, 1990
Creator: Luey, J.; Brouns, T. M. & Elliott, M. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Coal Liquefaction Process Streams Characterization and Evaluation: The Use of Selective Chemical Reactions and Carbon NMR Spectroscopy in the Speciation and Quantification of Oxygen Functional Groups in Coal Resids

Description: This study demonstrated the feasibility of using phase-transfer methylation reactions for the derivatization of hydroxyl functionalities and single-electron transfer reactions to cleave ether groups in distillation resid materials derived from direct coal liquefaction. {sup 13}C-NMR was used to analyze the reaction products. It was demonstrated that the techniques can be used to speciate and quantify about half of the oxygen in resids. The remaining half of the oxygen is presumed to be present … more
Date: November 1, 1992
Creator: Stock, L. M. & Cheng, C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Heterogeneous catalytic process for alcohol fuels from syngas. Sixth quarterly technical progress report, April--June 1993

Description: The principal objectives of this project are to discover and evaluate novel heterogeneous catalysts for conversion of syngas to oxygenates having use as fuel enhancers, to explore novel reactor and process concepts applicable in this process, and to develop the best total process for converting syngas to liquid fuels. The project is being pursued as two concurrent tasks. Task 1 involves catalyst research and development and is being largely conducted by catalyst chemists and analytical speciali… more
Date: November 1, 1993
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Synthesis of 6-Methyl-9-propyldibenzothiophene-4-ol

Description: Conversion of 4'-methylpropiophenone to 1-methyl-4-n-propylbenzene was accomplished in high yields. Bromination of the latter resulted in isomers of methyl-n-propyl-1-bromobenzene. Reaction of the isomers with sodium butoxide and 2-methoxybenzenethiol in presence of Pd[P(C[sub 6]H[sub 5])[sub 3]][sub 4] in 1-butanol was studied. The methylpropylbenzene was also iodinated. A decision to use iodination vs bromination will be made when more data are accumulated. 6 refs, figs.
Date: November 20, 1990
Creator: Eisenbraun, E.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Femtosecond dynamics of fundamental reaction processes in liquids: Proton transfer, geminate recombination, isomerization and vibrational relaxation. [Spiropyrans]

Description: The fast excited state intramolecular proton transfer of 3-hydroxyflavone is measured and effects of external hydrogen-bonding interactions on the proton transfer are studied. The proton transfer takes place in [approximately]240 fsec in nonpolar environments, but becomes faster than instrumental resolution of 110 fsec in methanol solution. The dynamics following photodissociation of CH[sub 2]I[sub 2] and other small molecules provide the first direct observations of geminate recombination. The… more
Date: November 1, 1992
Creator: Schwartz, Benjamin Joel
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Laser spectroscopy and dynamics of transient species formed in pyrolysis reactions

Description: This research concerns the study of the spectroscopy and excited state dynamics of a number of transient molecules containing either sulfur or oxygen. The identification and study of sulfur species which are analogs of important oxygen-containing combustion intermediates is important to our understanding of reactive intermediates. The oxygen-containing species chosen for study are new systems whose electronic spectra have not previously been identified. The major experimental technique used in … more
Date: November 1, 1991
Creator: Clouthier, D. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Laser spectroscopy and dynamics of transient species formed in pyrolysis reactions. Three year progress report, June 1, 1989--May 31, 1992

Description: This research concerns the study of the spectroscopy and excited state dynamics of a number of transient molecules containing either sulfur or oxygen. The identification and study of sulfur species which are analogs of important oxygen-containing combustion intermediates is important to our understanding of reactive intermediates. The oxygen-containing species chosen for study are new systems whose electronic spectra have not previously been identified. The major experimental technique used in … more
Date: November 1, 1991
Creator: Clouthier, D. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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