425 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Organic Oxygen Compounds"  
prev Results: 193 - 216 next
open access

Coal anion structure and chemistry of coal alkylation. Final report, March 1, 1979-February 29, 1980

Description: In accord with Task 1, some ether cleavage reactions were carried out in two different media - potassium/naphthalene/tetrahydrofuran and potassium/ ammonia - so that the merits and demerits of the two methods could be compared. Preliminary results suggest that both systems yield the same products, and that the ammonia medium is more convenient to work with, because of the absence of by-products such as reduced naphthalenes and tetralin. Dialkyl ethers were found to be least reactive compounds w… more
Date: January 1, 1980
Creator: Stock, L.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Three point bend creep testing of carbon/epoxy

Description: This study provides data to verify theoretical models for predicting and characterizing viscoelastic behavior of fiber composites. Since performing uninterrupted creep tests for years at a time was not feasible, creep behavior was accelerated with elevated temperatures. An improved method was developed and implemented for measuring specimen deflection within the tight confines of an environmental chamber. This proved to be critical to make this experiment a success. 3 figs.
Date: June 27, 1990
Creator: Hiromoto, D.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Ultrahigh-brightness XeC1 laser system

Description: A laser system that produces terawatt-level pulses of 308-nm light with near-diffraction-limited beam quality is under development. Pulses of 175-fs duration are generated at 616 nm in a synchronously-pumped mode-locked dye oscillator. These pulses are amplified in a three-stage dye amplifier longitudinally pumped by the frequency-doubled output of a regenerative Nd:YAG amplifier. Output of the dye amplifier is frequency-doubled in a BBO crystal and amplified in a chain of XeCl excimer stages. … more
Date: January 1, 1989
Creator: Gibson, R. B.; Gosnell, T. R.; Lester, C. S.; Robers, J. P.; Tallman, C. R. & Taylor, A. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Effects of radiation on TFTR coil materials

Description: The coupled Fast Reactivity Measurements Facility (CFRMF) at the Idaho National Engineering Laboratory was used to irradiate coil insulation specimens provided by the Princeton Plasma Physics Laboratory. Exposure times were chosen as to be representative of expected lifetime doses in the TFTR. Shear bond and flexure tests were performed on irradiated samples; identical unirridated samples were tested as controls. A general loss of strength (10 to 20%) was seen on the majority of specimens.
Date: January 1, 1979
Creator: Imel, G.R.; Kelsey, P.V. & Ottewitte, E.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Polarized absorption spectra of flavin mononucleotide in flavodoxin crystals

Description: Although it has long been recognized that protein environments modulate the electronic structure of flavins, the precise nature of the interactions that lead to a specific effect are still poorly understood. Detailed knowledge of flavin environments from high resolution crystal structures of flavoproteins, coupled with spectroscopic measurements and molecular orbital calculations should begin to clarify the relative importance of the various possible interactions in a given system. Changes in o… more
Date: January 1, 1990
Creator: Hanson, L.K. (Brookhaven National Lab., Upton, NY (USA)); Christoph, G.W.; Hofrichter, J. (National Insts. of Health, Bethesda, MD (USA). Lab. of Chemical Physics) & Ludwig, M.L. (Michigan Univ., Ann Arbor, MI (USA). Div. of Biophysics Research)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Neutron and. gamma. -ray irradiation effects in composite organic insulators

Description: Neutron irradiations with low ..gamma..-ray flux in the Intense Pulsed Neutron Source were carried out on four kinds of cloth-filled organic composites (filler: E-glass or carbon fiber; matrix: epoxy or polyimide resin) and a unidirectional alumina fiber/epoxy composite. The mechanical test was performed at room temperature. Following irradiation at room temperature, the glass/epoxy and glass/polyimide composites degrade significantly at a total neutron fluence of 5.0 x 10/sup 18/ n/cm/sup 2/ (… more
Date: 1984
Creator: Egusa, S.; Kirk, M. A.; Birtcher, R. C. & Hagiwara, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Flow cytometric analysis of mitotic cycle perturbation by chemical carcinogens in cultured epithelial cells. [Effects of benzo(a)pyrene-diol-epoxide on mitotic cycle of cultural mouse liver epithelial cells]

Description: A system for kinetic analysis of mitotic cycle perturbation by various agents was developed and applied to the study of the mitotic cycle effects and dependency of the chemical carcinogen benzo(a)pyrene-diolepoxide, DE, upon a mouse lever epithelial cell line, NMuLi. The study suggests that the targets of DE action are not confined to DNA alone but may include cytoplasmic structures as well. DE was found to affect cells located in virtually every phase of the mitotic cycle, with cells that were… more
Date: August 1, 1978
Creator: Pearlman, A.L.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

The thermodynamic properties of 2-aminobiphenyl (an intermediate in the carbazole/hydrogen reaction network)

Description: Catalytic hydrodenitrogenation (HDN) is a key step in upgrading processes for conversion of heavy petroleum, shale oil, tar sands, and the products of the liquefaction of coal to economically viable products. This research program provides accurate experimental thermochemical and thermophysical properties for key organic nitrogen-containing compounds present in the range of alternative feedstocks, and applies the experimental information to thermodynamic analyses of key HDN reaction networks. T… more
Date: December 1, 1990
Creator: Steele, W. V.; Chirico, R. D.; Knipmeyer, S. E. & Nguyen, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Dissolving coal at moderate temperatures and pressures. Final report, August 20, 1982-September 30, 1984. [Benzylamine]

Description: The main objectives of this research were to make Illinois No. 6 coal liquid or soluble with inexpensive reagents (e.g., solvolysis with methanol and acids), without high pressure equipment, and to see if our soluble products would be more reactive than whole coal in liquefaction processes. These efforts are unpromising. However, efforts to make coal soluble by oxidation with nitric acid gave encouraging results. When Illinois No. 6 and Wyodak coals were allowed to stand in sunlight for 282 day… more
Date: September 21, 1984
Creator: Mayo, F. R.; Hirschon, A. S. & Sundback, K. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Organolanthanide Reagents and the Mukaiyama Reaction

Description: The bis(pentamethylcyclopentadienyl) lutetium halide complex ((C/sub 5/Me/sub 5/)/sub 2/LuCl/center dot/THF) was synthesized and characterized. The crystal structure of this complex shows that the Lu is at the center of a distorted tetrahedron consisting of the centroids of two cyclopentadienyl rings, the oxygen atom of a tetrahydrofuran molecule and a chlorine atom. /sup 1/H NMR studies of toluene-d/sub 8/ solutions of (C/sub 5/Me/sub 5/LuCl(THF) + THF, (TMS/sub 2/CP)/sub 2/LuCl(THF) + THF, an… more
Date: January 1989
Creator: Gong, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Structural properties of laminated Douglas fir/epoxy composite material

Description: This publication contains a compilation of static and fatigue and strength data for laminated-wood material made from Douglas fir and epoxy. Results of tests conducted by several organizations are correlated to provide insight into the effects of variables such as moisture, size, lamina-to-lamina joint design, wood veneer grade, and the ratio of cyclic stress to steady stress during fatigue testing. These test data were originally obtained during development of wood rotor blades for large-scale… more
Date: May 1, 1990
Creator: Spera, D.A. (National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center); Esgar, J.B. (Sverdrup Technology, Inc., Cleveland, OH (USA)); Gougeon, M. & Zuteck, M.D. (Gougeon Bros., Bay City, MI (USA))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Synthesis of dimethyl ether and alternative fuels in the liquid phase from coal-derived synthesis gas

Description: As part of the DOE-sponsored contract for the Synthesis of Dimethyl Ether (DME) and Alternative Fuels in the Liquid Phase from Coal- Derived Syngas, the single-step, slurry phase DME synthesis process was developed. The development involved screening of catalyst systems, process variable studies, and catalyst life studies in two 300 ml stirred autoclaves. As a spin-off of the Liquid Phase Methanol (LPMEOH*) process, the new process significantly improves the syngas conversion efficiency of the … more
Date: September 1, 1992
Creator: Bhatt, B.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

[Experimental and kinetic modeling of acid/base and redox reactions over oxide catalysts]

Description: The research has involved the characterization of catalyst acidity, [sup 2]D NMR studies of Bronsted acid sites, and kinetic, calorimetric, and spectroscopic studies of methylamine synthesis and related reactions over acid catalysts. Approach of this work was to explore quantitative correlations between factors that control the generation, type, strength, and catalytic properties of acid sites on zeolite catalysts. Microcalorimetry, thermogravimetric analysis, IR spectroscopy, and NMR spectrosc… more
Date: January 1, 1993
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Results of emissions testing while burning densified refuse derived fuel, Dordt College, Sioux Center, Iowa

Description: Pacific Environmental Services, Inc. provided engineering and source testing services to the Council of Great Lake Governors to support their efforts in promoting the development and utilization of densified refuse derived fuels (d-RDF) and pelletized wastepaper fuels in small steam generating facilities. The emissions monitoring program was designed to provide a complete air emissions profile while burning various refuse derived fuels. The specific goal of this test program was to conduct air … more
Date: October 1, 1989
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation, design, development and delivery of a 1200-kV prototype termination. Ninth technical progress report, December 1, 1980-February 28, 1981

Description: Tests are continuing on the shatter-resistant weathercase models and small samples. Two epoxy weathercase material samples are still undergoing accelerated tensile creep tests. Progress is reported on the design of the full scale prototype termination.
Date: April 30, 1981
Creator: Billings, J S & Fischer, W H
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Irreversible Adsorption of Phenolic Compounds by Activated Carbons

Description: Studies were undertaken to determine the reasons why phenolic sorbates can be difficult to remove and recover from activated carbons. The chemical properties of the sorbate and the adsorbent surface, and the influences of changes in the adsorption and desorption conditions were investigated. Comparison of isotherms established after different contact times or at different temperatures indicated that phenolic compounds react on carbon surfaces. The reaction rate is a strong function of temperatu… more
Date: December 1988
Creator: Grant, T. M. & King, C. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Synthesis of model compounds for coal liquification research

Description: Research continued on the synthesis of model compounds for coal liquefaction research. This report covers the actual laboratory investigation performed during the reporting period in order to attain the stated objective of the project, viz, the synthesis of a model compound containing tetrahydronaphthalene, naphthalene and phenyl moieties linked by methylene, ethylene and ether bonds. The overall synthetic approach aimed at obtaining the end product has been broken down into three major steps t… more
Date: October 8, 1990
Creator: Sen, P.K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Dual cure photocatalyst systems

Description: A family of dual cure photocatalyst systems is being developed to be used in the solventless processing of organic coatings. The photocatalyst systems consist of organometallic compounds often in combination with other agents. Upon photolysis, the photocatalyst system generates a Lewis acid and a free radical. The Lewis acid can initiate the polymerization of epoxies or the addition of isocyanates and polyols to form polyurethanes while the free radical can initiate the polymerization of acryla… more
Date: January 1, 1990
Creator: DeVoe, R. J.; Brown-Wensley, K. A.; Holmes, G. L.; Mathis, M. D.; McCormick, F. B.; Palazzotto, M. C. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Analytical Chemistry Laboratory: Progress report for FY 1988

Description: The purpose of this report is to summarize the activities of the Analytical Chemistry Laboratory (ACL) at Argonne National Laboratory (ANL) for fiscal year 1988 (October 1987 through September 1988). The Analytical Chemistry Laboratory is a full-cost recovery service center, with the primary mission of providing a broad range of analytical chemistry support services to the scientific and engineering programs at ANL. In addition, the ACL conducts a research program in analytical chemistry, works… more
Date: December 1, 1988
Creator: Green, D. W.; Heinrich, R. R.; Graczyk, D. G.; Lindahl, P. C. & Erickson, M. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Quantitative comparison of electronic component/solder joint stress relief in encapsulated assemblies

Description: A quantitative comparison was made of various stress relief bends with and without sleeving in three commonly used encapsulants. Silicone rubber and heat shrinkable polyolifin sleeving were used on right angle, full loop, and hump style lead bends. Small (from 254 ..mu..m to 762 ..mu..m diameter) and large (762 ..mu..m to 1.27 mm diameter) wires were used to simulate small and large component leads. The component leads were encapsulated in microballoon-filled epoxy, 128 kg/m/sup 3/ urethane foa… more
Date: January 1, 1979
Creator: Cummings, D.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Shelf life determination of epoxy prepregs and film adhesives. Final report

Description: Kinetic data describing the cure of a Kevlar/epoxy prepreg and an epoxy film adhesive were determined by the use of Differential Scanning Calorimetry. For the Kevlar/epoxy prepreg, a correlation was found between the heat of reaction and percent resin flow; a similar correlation was found between the heat of reaction and lap-shear strength for the film adhesive. An equation was derived for the determination of the B stage time required to yield an epoxy prepreg possessing the desired flow prope… more
Date: January 1, 1979
Creator: Parker, B. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Coal liquefaction process streams characterization and evaluation

Description: This study demonstrated the feasibility of using temperature-programmed electron spin resonance (ESR) and thermogravimetric analysis (TGA) for the examination of tetrahydrofuran (THF)-soluble distillation resid materials derived from direct coal liquefaction. TGA is used to quantitate volatile losses in a temperature-programmed experiment. The TGA data are used to correct the free radical densities obtained by ESR as volatile material is evolved from the samples in the temperature-programmed ES… more
Date: October 1, 1992
Creator: Ibrahim, M.M. & Seehra, M.S. (West Virginia Univ., Morgantown, WV (United States). Dept. of Physics)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cationically polymerizable monomers derived from renewable sources

Description: The objectives of this project are to design and synthesize novel monomers which orginate from renewable biological sources and to carry out their rapid, efficient, pollution-free and energy efficient cationic polymerization to useful products under the influence of ultraviolet light or heat. A summary of the results of the past year's research on cationically polymerizable monomers derived from renewable sources is presented. Three major areas of investigation corresponding to the different cl… more
Date: October 1, 1992
Creator: Crivello, J.V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Synthetic fuel combustion: pollutant formation. Soot initiation mechanisms in burning aromatics. First quarterly report, 19 September-31 December 1980

Description: Although considerable progress has been made in recent years in understanding the phenomenology of soot formation in the combustion of hydrocarbon fuels, relatively little attention has been focused upon aromatic fuels of the types commonly found in coal liquids. In particular, the effects of gas-phase free radicals, formed during combustion, on the kinetics of formation of incipient soot particles have not been characterized. Accordingly, an experimental investigation of the detailed kinetics … more
Date: January 1, 1981
Creator: Rawlins, W. T. & Tanzawa, T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen