| Flammability and Kinetic Analysis of the Dry Carbon Monoxide Flame |
29 JAN 96 |
|
| Authors:
Richard Tam; INDIANA UNIV-PURDUE UNIV AT INDIANAPOLIS DEPT OF MATHEMATICAL SCIENCES
|
 | Preliminary studies on a simplified kinetic model for the hydrogen flame confirm the existence of the shock-like structure in flame temperature space for the logarithm of the mass burning rate that had been discovered previously in the study of the carbon monoxide flame; notably; the mass buring rate undergoes a multiplicative jump in contrast to the additive jump in regular shock waves. jg p1 |
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| Structures and Molecular Surface Electrostatic Potentials of High Density C, N, H Systems. |
25 JAN 1996 |
19 pages |
| Authors:
Jane S. Murray; Richard Gildardi; M. E. Grice; Pat Lane; Peter Politzer; NEW ORLEANS UNIV LA DEPT OF CHEMISTRY
|
 | Tri-s-triazine and two ditetrazolodiazines are known to have unusually high crystal densities (for unsubstituted C, N, H compounds). We have used a nonlocal density functional procedure to compute the geometries and energies of these and three related molecules, and then calculated the ab initio SCF electrostatic potentials on their molecular surfaces. We attribute the high densities to the relatively small molecular volumes and the strong intermolecular attractions arising from highly ... |
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| The Immersed Fatigue Response of Polymer Composites |
02 JAN 96 |
28 pages |
| Authors:
L. V. Smith; Y. J. Weitsman; TENNESSEE UNIV KNOXVILLE DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
|
| The effect of sea water on carbon/epoxy cross ply specimens is studied by consideration of fatigue data and failure modes. Tests were conducted using dry and saturated coupons fatigued in air, as well as pre-saturated coupons fatigued while immersed in sea water. The saturated coupons fatigued in air had the longest fatigue life, which was attributed to stress relief from sorption induced swelling. Saturated coupons fatigued in an immersed environment ... |
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| Internal Friction and Modulus Studies on Austempered Ductile Iron |
JAN 96 |
25 pages |
| Authors:
Tammy Hickey; Paul J. Cote; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
|
| Internal friction and modulus measurements were performed on three difference compositions of austempered ductile iron. These measurements were performed using a TA Instruments' Dynamic Mechanical Analyzer under a variety of thermal cycling conditions. The internal friction data exhibit the Snoek effect peaks at about 250 deg C. Using peak positions measured at different frequencies, the activation energy of the process was measured and found to average 31.9 kcal/mole. This is ... |
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| The Effect of Nitrogen Limitation on the Absorption and Scattering Properties of the Marine Diatom Thalassiosira pseudonana |
JAN 96 |
39 pages |
| Authors:
Rick A. Reynolds; Daiusz Stramski; Dale A. Kiefer; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF BIOLOGICAL SCIENCES
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| Optical properties of the marine diatom thalassiosira pseudonana were examined in nitrate-limited semicontinuous cultures at four rates of growth. Two experiments were conducted at each growth rate in which sampling of the culture was done at either the dark-to-light (D-L) or light-to-dark (L-D) transition of a 12 h photoperiod. Optical cross-sections and efficiency factors for absorption, scattering, and attenuation were calculated from measurements of the spectral absorption and beam attenuation ... |
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| Fluidized Bed Heat Treating |
JAN 96 |
207 pages |
| Authors:
Marc Glasser; S. Cytron; PROCEDYNE CORP NEW BRUNSWICK NJ
|
| Steel (carbon, alloy, tool, and stainless), aluminum, titanium, and other metal can be heat treated economically in a fluidized bed furnace. All heat treatments except controlled rate cooling rate annealing are viable. Since gases are used to fluidize a bed of powder, any gaseous atmosphere can be used, and simply by turning a few valves, an atmosphere can be completely changed over in 2 minutes or less. This feature allows ... |
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| Investigation of Oceanic Organic Chemistry Using State-of-the-Art Laser Based Analytical Techniques |
JAN 96 |
9 pages |
| Authors:
Jeffrey Bada; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE RESEARCH DIV
|
| The fluorescence of global seawater has been investigated using a sensitive laser-induced fluorometry system. In surface seawater, fluorescence is low due to photochemical bleaching. Fluorescence intensity increases with increasing depth in the oceans to about 500 to 1000 m; below this depth, seawater fluorescence is generally constant. Sediment porewaters are much more fluorescent than the overlaying seawater. Both porewater fluorescence, and the dissolved organic carbon (DOC) concentration, increase with depth ... |
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| Availability of Aerospace Rayon for SRM Nozzle Insulators |
96 |
|
| Authors:
R. C. Rossi; W. C. Wong; TRW INC SAN BERNARDINO CA
|
| For approximately 30 years, the nozzles of solid rocket motors (SRM) have used an aerospace grade of rayon as a precursor for carbon fabric reinforcement in phenolic composites employed as ablative insulators. Rayon has been the industry mainstay ever since and modern nozzle designs have been dependent upon the properties of carbon, fabric/phenolic, or graphite fabric/ phenolic composites derived from this material. Over the years, the industry has been dependent ... |
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| Electrochemical and Photochemical Treatment of Aqueous Waste Streams |
1996 |
8 pages |
| Authors:
J. C. Farmer; R. W. Pekala; F. T. Wang; D. V. Fix; A. M. Volpe; D. D. Dietrich; W. H. Siegel; J. F. Carley; LAWRENCE LIVERMORE NATIONAL LAB CA
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| Carbon aerogel electrodes have been used to remove NH4ClO4 and heavy metals from aqueous waste streams. Photochemical oxidation with H2O2 has been used to destroy organic contamination and is proposed as a means of avoiding the fouling of carbon aerogel electrodes. |
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| Synthesis and Properties of Perfluoroferrocene and Perfluororuthenocene. A Potential Class of High Temperature Materials |
31 DEC 95 |
17 pages |
| Authors:
Charles H. Winter; WAYNE STATE UNIV DETROIT MI DEPT OF CHEMISTRY
|
| The goal of our research was to prepare decafluoroferrocene and decafluororuthenocene from permetalated precursors, to prepare mono- and disubstituted perfluorometallocenes, and to prepare and evaluate the thermal characteristics of polymers and oligomers derived from the perfluorometallocenes. In the period of support, we explored the preparation of permercurated, perlithiated, permagnesiated, perzincated, and peraluminated cyclopentadienyl complexes and examined the reactions of these species with simple electrophiles. The motivation for working with the ... |
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| Growth, Characterization and Device Development in Monocrystalline Diamond Films |
DEC 95 |
18 pages |
| Authors:
R. F. Davis; R. J. Nemanich; Z. Sitar; NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| X-ray photoelectron spectroscopy (XPS) has been conducted on a TiC(111) substrate to understand bias-enhanced nucleation (BEN) of CVD diamond. The data revealed two important results: i) the C:Ti ratio of the substrate decreases after an initial exposure to the biasing procedure, and ii) the C-C bonding signal is consistent with the formation of island-like deposition of an overlayer. The decrease in the C-Ti bonding signal suggests that BEN causes C ... |
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| Low Temperature Deposition and Characterization of N- and P-Type Silicon Carbide Thin Films and Associated Ohmic and Schottky Contacts |
DEC 95 |
41 pages |
| Authors:
Robert F. Davis; Robert J. Nemanich; M. C. Benjamin; S. Fleming; S. Kern; NORTH CAROLINA STATE UNIV AT RALEIGH
|
| Epitaxial, undoped films of 6H-SiC(0001) and 3C-SiC(111) have been grown by gas source (GS) MBE on 6H-SiC(0001) substrates and 2H-AlN(0001) layers between 1050-1250 deg C using SiH4 and C2H4 for Si and C, respectively. Controlled n-and p-type doping was achieved via NH3 and evaporated Al. REED and HRTEM showed the films to be monocrystalline and of either the 6H or 3C polytype. As-deposited (at RT) NiAl contacts with Ni passivating ... |
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| The Effect of Varying the MnO Content of the Flux Used for the Submerged Arc Welding of Navy HY-100 Steel |
DEC 95 |
168 pages |
| Authors:
Allen L. Clark; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Weld metal strength and toughness are determined by its microstructure, which is in turn determined by the concentration of various alloying elements and impurities as well as the welding thermal cycle. This study investigated the effects of systematically varying the manganese oxide content in the flux used for HY-l00 submerged arc welds. A trial addition of cerium oxide was also performed. Specimens were compared using mechanical properties, weld metal chemistry, ... |
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| Electrical Characterization of 4H-and 6H-Silicon Carbide Schottky Diodes |
DEC 95 |
118 pages |
| Authors:
Jeffrey C. Wiemeri; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| The electrical properties of silicon carbide (SiC) make it an excellent candidate for use in high temperature/high power devices due to its wide bandgap, high breakdown field, high electron mobility, etc. In this work two Schottky diodes of platinum (Pt) on n-type carbon faced 4H-SiC and three Schottky diodes of nickel (Ni) on n-type silicon faced 6H-SiC were electrically characterized. The diodes exhibited good performance up to 698 K for ... |
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| Thermal Stability of Epoxy Composite Materials |
DEC 95 |
22 pages |
| Authors:
Mark F. Fleszar; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
|
| The thermal oxidative stability of Fiberite 7714A (glass/epoxy). 976 (carbon/epoxy). and 977-2 (carbon/epoxy) was studied at temperatures up to and above their respective glass transition temperatures. Composite samples were subjected to both short- and long-term heating. The first set of samples was heated for 4-6 hours from 100 to 350 deg C, and the second set of samples was cycled for 30-minute intervals from 200 to 400 deg C. The ... |
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| Removal of Waste Anesthetics Exhaust |
DEC 1995 |
|
| Authors:
S. H. Liang; D. G. Bailey; R. T. Poirier; B. V. Lacroix; DEFENCE RESEARCH ESTABLISHMENT SUFFIELDRALSTON (ALBERTA)
|
| This report describes the use of Canadian military carbon-containing canisters (C2 and C7) in removing waste anesthetics exhaust. The efficiency and service-life of these canisters are presented. In addition, the use of other adsorbents and some commercially-available occupational health and safety canisters for this purpose is also discussed. |
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| Surfactant-Enhanced Light Emission- or Absorbance-Based Binding Assays for Polynucleic Acids. |
14 NOV 1995 |
|
| Authors:
David A. Kidwell; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| Thc fluorescence of polycyclic aromatic labels and excimers of these labels, attached to nucleic acids is greatly enhanced by the presence of quaternary ammonium surfactants having at least one long chain (C4 or greater) alkyl group. This enhancement may be advantageously used in Pi Overlapping Rings Systems Contained in a Homogeneous Assay (PORSCHA) and in conventional assays. |
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| Characterization of Hydrogen Ingress in High-Strength Alloys |
NOV 95 |
107 pages |
| Authors:
Bruce G. Pound; SRI INTERNATIONAL MENLO PARK CA
|
| The ingress of hydrogen (H) in various high-strength alloys was investigated with a view to characterizing their susceptibility to hydrogen embrittlement (HE). A potentiostatic pulse technique was applied to three Fe- base alloys (AerMet 100, H11, and A-286), two Cu-containing alloys (Be-Cu and alloy K-500), a superferritic stainless steel (Sea-Cure), and three Beta-Ti alloys (Ti-15V-3Cr-3Al-3Sn, Beta-21S, and Beta-C) in 1 mol/L acetic acid-1 mol/L sodium acetate. The data were analyzed ... |
|
| Thermal Bond System. |
31 OCT 1995 |
10 pages |
| Authors:
Daniel J. Vavrick; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A thermal bond system is provided for bonding a first component that produces heat to a second component that dissipates heat. Carbon or other thermally conductive fiber tows are woven together to define a fabric mesh having first and second opposing woven surfaces. An adhesive bond that is flowable prior to drying is used to wet and cover the first and second opposing surfaces. The adhesive bond extends into interstices ... |
|
| Consortium News - Newsletter of the SERDP Biotreatment Research Consortium. Volume 1, Number 1 |
OCT 95 |
6 pages |
| Authors:
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
|
| The Department of Defense has over 12,000 contaminated |
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| Dynamics of Linear and Cross-Linked Epoxy Systems |
22 SEP 95 |
25 pages |
| Authors:
Paul T. Inglefield; CLARK UNIV WORCESTER MA
|
| Deuterium solid state echo delay line shapes are used to establish the local motions occurring in linear and crosslinked epoxy systems based on bisphenol A. Four isotopically labeled samples were prepared: linear and crosslinked resins with deuterated methylene units, and linear and crosslinked resins with deuterated phenylene units. Two local motions are observed in all four samples: trans-gauche isomerization of the methylene units and pi flips of the phenylene units. ... |
|
| European Workshop on Molecular Spectroscopy and Photon-Induced Dynamics (8th) Held at Oxford, England on 3-7 September 1995 |
07 SEP 95 |
91 pages |
| Authors:
CAMBRIDGE UNIV (UNITED KINGDOM)
|
| Partial contents: Photon-induced dynamics in the gas phase; The photophysics and photochemistry of NO3; Spectroscopy and photodissociation of oriented molecules; More photon-induced dynamics; Intersystem crossing studied by high resolution quantum beat spectroscopy; Coherent control of unimolecular reactions; Spectroscopy and photon-induced dynamics at interfaces; Vibrational surface dynamics; Structure and phase transitions of monolayers of n-alcohols on water; Photon-induced processes in extraterrestrial environments; Spectroscopy of carbon chains of relevance to astrophysics; Infrared ... |
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| Vibrational Overtone Spectrum of Cycloheptatriene |
05 SEP 95 |
18 pages |
| Authors:
Andrei V. Fedorov; Deanne L. Snavely; BOWLING GREEN STATE UNIV OH CENTER FOR PHOTOCHEMICAL SCIENCES
|
| The spectrum of the first through fifth vibrational overtone absorptions of cycloheptatriene are reported. The spectrum for the first and second overtones were recorded using a liquid sample while the third, fourth and fifth overtones were recorded for the gaseous samples. Four progressions belonging to the olefinic and methylenic C-H bond stretches are identified by combining both the gaseous and liquid data. Weak progressions lying in between these strong stretching ... |
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| Polyarylacetylene-Matrix Composites for Solid Rocket Motor Components |
01 SEP 95 |
11 pages |
| Authors:
H. A. Katzman; J. J. Mallon; W. T. Barry; AEROSPACE CORP EL SEGUNDO CA TECHNOLOGY OPERATIONS
|
| The fabrication process for an ablative material for solid rocket motor applications, carbon-fabric-reinforced polyarylacetylene (PAA) resin composite, is detailed. Data concerning the physical, mechanical, and ablative performance of this material are presented. PAA is a highly cross-linked aromatic polymer that contains only carbon and hydrogen. Its principal advantage is its high char yield (approx. 90 percent). For the resin synthesis, a controllable, low-temperature technique that produces a soluble, easy-to-process prepolymer ... |
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| Ultrahigh-Vacuum High-Resolution Transmission Electron Microscopy of Sputter-Deposited MoSsub2 Thin Films |
01 SEP 95 |
14 pages |
| Authors:
G. Jayaram; N. Doraiswamy; L. D. Marks; M. R. Hilton; AEROSPACE CORP EL SEGUNDO CA TECHNOLOGY OPERATIONS
|
| High-resolution electron microscopy has been used to characterize the structure of sputter-deposited MoS2 coatings under both conventional and ultrahigh-vacuum (UHV) conditions. As deposited, the films have a mixture of short-range ordered basal-plane and edge-plane oriented grains near the film substrate interface; structural changes were characterized in a UHV transmission electron microscope as a function of two processing variables: temperature and Au deposition. Annealing in an oxygen environment was also carried ... |
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| High Temperature Epoxy-Phthalonitrile Blends. |
01 SEP 1995 |
30 pages |
| Authors:
Teddy M. Keller; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A copolymer is formed from reacting, within a melt, a phthalonitrile resin with an epoxy resin having at least three epoxy groups. In an alternative embodiment, a copolymer is formed by reacting a phthalonitrile resin with an epoxy resin, at least one of the epoxy and phthalonitrile resins having a perfluorinated carbon. The copolymers of the present invention have ... |
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| A Study of Failure in Carbon/Foam Sandwich Composites with Stress Concentration. |
SEP 1995 |
105 pages |
| Authors:
Peter J. Sistare; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Both experimental and numerical studies were performed to understand the failure mechanism of carbon/foam sandwich composite plates with stress concentration. The plates had circular holes and were subjected to bending and compressive loading. Both three-point and four-point bending tests were conducted, For the testing, the foam thickness, the size of the hole, the number of holes, and the hole location were varied. In addition, a finite element analysis was conducted ... |
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| Microstructural and Strength Stability of a Developmental CVD SiC Fiber. |
SEP 1995 |
14 pages |
| Authors:
Ramakrishna T. Bhatt; Anita Garg; David R. Hull; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER
|
| The effects of thermal exposure on the room temperature tensile strength and microstructure of a developmental 50 microns CVD SiC fiber have been studied. The fibers were heat treated between 600 and 2000 C in 0.1 MPa argon and air environments for up to 100 hr. In the as-fabricated condition, the fibers showed approx. 6 GPa tensile strength. After argon treatment, the fibers showed strength degradation after 1 hr exposure ... |
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| Phytoplankton Growth and Diel Variations in Beam Attenuation through Individual Cell Analysis |
SEP 95 |
|
| Authors:
Michele D. DuRand; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| In order to understand diel variations in the bulk water inherent optical property beam attenuation, mean forward light scatter of different populations of phytoplankton, from flow cytometric analysis of individual cells, was determined. Forward light scatter showed diel patterns similar to those of beam attenuation, with a minimum near dawn and a maximum near dusk, for populations of prokaryotic picophytoplankton (Prochlorococcus and Synechococcus) and eukaryotic nanophytoplankton measured in the equatorial ... |
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| Ion Implantation Processes for Heteroepitaxial Nucleation of Diamond |
SEP 95 |
41 pages |
| Authors:
Allen Kirkpatrick; EPION CORP BEDFORD MA
|
| The objective of this program has been to employ variations of high temperature ion implantation-outdiffusion processing to promote heteroepitaxial nucleation of diamond on a foreign substrate. The program has involved development of ion implantation apparatus with capabilities for processing at very high temperatures and for in-situ CVD diamond growth. Studies have been conducted to examine implantation of carbon ions, sometimes in conjunction with other ions such as hydrogen or fluorine, ... |
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| Development of a Glass Reactor Lining for Chlorocarbon-Supercritical Water Reactions |
09 AUG 95 |
8 pages |
| Authors:
Thomas Houser; WESTERN MICHIGAN UNIV KALAMAZOO
|
| The current study has examined the influence of supercritical water (SW) on reactions of organic chlorides. The aliphatic compounds were represented by 1-chloro-3-phenylpropane which reacted rapidly and completely by both pyrolysis and with SW. The presence of SW produced only a minor shift in organic products. SW did promote the reaction between the metal walls and the chloride, or HCl formed from it, to quantitatively produce metal chlorides, as confirmed ... |
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| Near-IR Spectra of Polyethylene, Polyethylene Glycol and Polyvinylethyl Ether |
08 AUG 95 |
13 pages |
| Authors:
D. L. Snavely; J. Dubsky; BOWLING GREEN STATE UNIV OH CENTER FOR PHOTOCHEMICAL SCIENCES
|
| The near-IR spectrum of polyethylene, polyethylene glycol and polyvinylethyl ether have been measured. The CH and OH stretch and bend absorptions have been assigned using local mode theory. The CH stretch anharmonicities are about 57/cm, typical of CH anharmonicities in molecular samples. The CH bend anharmonicities are 7, 10 and 11 /cm, respectively, for polyethylene, polyethylene glycol and polyvinylethyl ether. The CH bend absorption intensities decrease by about a factor ... |
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| Characterization and Electrochemical Properties of Electrosynthesized Carbonaceous Fibers |
01 AUG 95 |
4 pages |
| Authors:
Michael J. Shane; Beatrice K. Chinh; Michael J. Sailor; CALIFORNIA UNIV SAN DIEGO LA JOLLA
|
| Carbonaceous fibers with diameters ranging from 0.1-5 microns and lengths up to several hundred microns spontaneously form during cathodic electrodecomposition of CCl4 in nonaqueous solvents (CH3CN or CH2Cl2) containing tetrabutylammonium salts. The fiber morphology is dependent on current density, CCl4 concentration, and electrode surface preparation. X-ray photoelectron spectroscopic measurements revealed that the fibers consist primarily of carbon, with some nitrogen, chlorine, and oxygen impurities. X-ray and electron diffraction showed the ... |
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| Lab-Scale Pressure Swing Adsorption Parametric Study: Hexafluorocyclobutene on BPL Carbon and 13x Molecular Sieve |
AUG 95 |
|
| Authors:
Derek J. Mancinho; EDGEWOOD RESEARCH DEVELOPMENT AND ENGINEERING CENTER ABERDEEN PROVING GROUND MD
|
| Pressure-swing adsorption (PSA) is currently being investigated as a potential technology approach for regenerable collective protection in military vehicles that are required to operate in chemical/biological warfare theaters. Previous experiments have used nontoxic chemicals as simulants for actual chemical warfare agents. The original experiments helped to generate knowledge on operational parameters such as pressure, purge to feed ratios, cycle times, and adsorbent selection. The experiments in this study focus on ... |
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| Failure Models for Textile Composites |
AUG 95 |
141 pages |
| Authors:
Brian Cox; ROCKWELL INTERNATIONAL THOUSAND OAKS CA SCIENCE CENTER
|
| The goals of this investigation were to: identify mechanisms of failure and determine how the architecture of reinforcing fibers in 3D woven composites controlled stiffness, strength, strain to failure, work of fracture, notch sensitivity, and fatigue life and to model composite stiffness, strength, and fatigue life. A total of 11 different angle and orthogonal interlock woven composites were examined. Composite properties depended on the weave architecture, the tow size, and ... |
|
| Development of an Ultra-Safe Rechargeable Lithium-Ion Battery |
AUG 95 |
4 pages |
| Authors:
J. K. Jacobs; ELECTROFUEL MFG CO TORONTO (ONTARIO)
|
|
| Metallacarborane-Based Precursors for Electroactive Materials |
31 JUL 95 |
11 pages |
| Authors:
Russell N. Grimes; VIRGINIA UNIV CHARLOTTESVILLE
|
| This project was concerned with the design, preparation, and study of organometallic complexes containing transition metals, hydrocarbon rings, and boron-carbon (carborane) ligands, that can serve as precursors to new families of materials having useful electronic, magnetic, and/or optical properties. The work focused on three primary objectives: (1) design and synthesis of suitable metallacarborane building-block complexes; (2) development of methods for assembling large systems via linking, coupling, stacking, and fusion, and ... |
|
| Near-IR Spectrum of Polybutadiene |
20 JUL 95 |
14 pages |
| Authors:
D. L. Snavely; C. Angevine; BOWLING GREEN STATE UNIV OH CENTER FOR PHOTOCHEMICAL SCIENCES
|
| The vibrational overtone spectrum of polybutadiene was recorded up to 14,000/cm and interpreted in the local mode model. The methylenic and olefinic CH stretch progressions, with anharmonicities of 66 and 59/cm, respectively, were identified for delta v = 2, 3,4 and 5. The vinyl stretch progression, being much weaker, was identified through the delta v = 3 transition. Several bending progressions appeared belonging to the cis, trans and vinyl isomers, ... |
|
| Control of Soot Formation |
19 JUL 95 |
5 pages |
| Authors:
Richard A. Dobbins; BROWN UNIV PROVIDENCE RI DIV OF ENGINEERING
|
| The personnel, publications and important research results of the three year grant on the control of soot formation are presented in this final report. Systematic probing of the ethene diffusion flame at various N2/fuel dilution ratios using thermophoretic sampling has revealed the variation of height within the flame at which soot precursor particles are converted to carbonaceous aggregates. The measurement of temperature on the axis of the flame at various ... |
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| Environmental Effects of Dredging. Fluoranthene Kappa (sub DOC) in Sediment Pore Waters |
JUL 95 |
11 pages |
| Authors:
James M. Brannon; Judith C. Pennington; William M. Davis; Charolett Hayes; Robert M. Engler; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
|
| This note describes laboratory testing conducted to examine the partitioning of fluoranthene to dissolved organic carbon in the pore water of sediments. The U.S. Environmental Protection Agency (EPA) is authorized to develop and implement sediment quality criteria (SQC) under Section 304(a) of the Clean Water Act. Under this authority the EPA is proceeding with development of SQC for nonpolar organic compounds and metals. A major assumption in the current approach ... |
|
| Visible Light Photopolymerization: Synthesis of New Fluorone Dyes and Photopolymerization of Acrylic Monomers Using Them |
15 JUN 95 |
31 pages |
| Authors:
Takayoshi Tanabe; Afranio Torres-Filho; D. C. Neckers; BOWLING GREEN STATE UNIV OH CENTER FOR PHOTOCHEMICAL SCIENCES
|
| Several 3-alkoxy-5,7diiodo-6-fluorones (max = 470 nm) have been synthesized and evaluated as initiators for photopolymerization triggered with the 515.5 nm line of an Ar+ laser. 2-Acyl and 2-lkylA,5,7-triiodo 3-hydroxy-6- fluorones were also tested at 515.5 nrn. 9-Cyano.2-acyl- and 9-cyano-2-alkyl-4, 5,7-triiodo-3-hydroxy-6-fluorones were studied and could be excited with the 632 nm line of a He-Ne laser. Dyes with long linear carbon chain alkoxy groups at C- 6 showed larger molar extinction ... |
|
| Solution and Solid C13 NMR Studies of Polyolacrylate Networks |
15 JUN 95 |
45 pages |
| Authors:
Adrian Lungu; D. C. Neckers; BOWLING GREEN STATE UNIV OH CENTER FOR PHOTOCHEMICAL SCIENCES
|
| We introduce the use of several C13 NMR techniques to address the problem of the structures of photopolymerized polyolacrylates. We have used these techniques to study both the liquid and solid states of acrylic monomers and oligomers and the network structure formed upon their photopolymerization. High resolution NMR has allowed us to consider the molecular structure of the acrylic groups belonging to each of a series of polyolacrylate monomers. In ... |
|
| Purification of C70 Using Charcoal as a Stationary Phase in a Flash Chromatography Column |
07 JUN 95 |
14 pages |
| Authors:
W. A. Scrivens; A. M. Cassell; K. E. Kinsey; J. M. Tour; SOUTH CAROLINA UNIV COLUMBIA DEPT OF CHEMISTRY AND BIOCHEMISTRY
|
| Described is a method for the purification of C60 and C70 using a flash chromatography column that contains charcoal as the stationary phase. A number of functionalized aromatic solvents are studied and their efficacy for extraction, NMR spectral acquisition, and chromatographic purification of fullerenes is discussed. Ortho-dichlorobenzene was chosen as the best solvent for these applications and examples of its use in the extraction of higher fullerenes (>C84) and in ... |
|
| Mechanical and Microstructural Properties of Ultra-Low Carbon Bainitic Steel Weld Metal |
JUN 95 |
125 pages |
| Authors:
Victor Reck Jr; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Because of its reduced susceptibility to cracking, Ultra-Low Carbon Bainitic (ULCB) steel weld wire is being investigated as a consumable for Gas Tungsten Arc (GTA) and Gas Metal Arc (GMA) welding of Navy high strength (100 ksi) steels. In the present work, a candidate ULCB weld wire was investigated for GTA and GMA welding processes as a function of both welding power and cover gas. The strength and Charpy V-notch ... |
|
| Solid State Lithium/Polymer Battery |
JUN 95 |
20 pages |
| Authors:
Charles W. Walker Jr; ARMY RESEARCH LAB FORT MONMOUTH NJ
|
| An all-solid-state lithium rechargeable cell has been fabricated with an ionically conductive solid polymer electrolyte (SPE) and an electronically conductive polymer cathode. The SPE was comprised of lithium salts (LiCF3SO3, LiN(CF3SO2)2) dissolved in poly(ethylene oxide) (PEO). The polymer cathode, poly(3-methylthiophene) (PMT), was formed by electropolymerization. Cell discharge/charge reactions involve lithium stripping/plating at the anode and anion undoping/doping at the cathode. Lab cells cycled for up to 170 cycles at temperatures ... |
|
| Interface Properties of Wide Bandgap Semiconductor Structures |
JUN 95 |
235 pages |
| Authors:
R. F. Davis; S. Bedair; J. Bernholc; J. T. Glass; R. J. Nemanich; NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| Heteroepitaxy is the growth of a crystal (or a film) on a foreign crystalline substrate that determines its orientation. While the potential of heteroepitaxial deposition has been demonstrated, significant advances in theoretical understanding, experimental growth and control of this growth, and characterization are required to exploit the capabilities of this process route. The materials of concern in this report are classified as wide bandgap semiconductors and include diamond, SiC and ... |
|
| Cadmium: A Toxin and a Nutrient for Marine Phytoplankton |
JUN 95 |
|
| Authors:
Jennifer G. Lee; MASSACHUSETTS INST OF TECH CAMBRIDGE
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| Although cadmium is known to be very toxic, it exhibits nutrient-like vertical concentration profiles in the open ocean. Cadmium enhances the growth of the marine diatom Thalassiosira weissflogii, a chlorophyte and some prymnesiophytes at inorganic zinc and cadmium concentrations typical of surface seawater. Detailed studies of T. weissflogii show that cadmium is also regulated like a nutrient over a wide range of external inorganic cadmium (5-500pM) and inorganic zinc (2-16pM) ... |
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| Interfaces in Inorganic Matrix Composites: Atomistic Simulation and Experiment |
JUN 95 |
109 pages |
| Authors:
J. Megusar; S. Yip; J. A. Cornie; B. V. Chambers; A. Isik; MASSACHUSETTS INST OF TECH CAMBRIDGE MATERIALS PROCESSING CENTER
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| The objective of this research was to contribute to the design or structure and mechanical properties of ceramic and carbon materials, by applying atomistic simulation and experiment. In the research on carbon, methodology has been developed to construct amorphous carbon/graphite and graphite/graphite (twin) interfaces by using empirical potential function. Simulation observations have been validated by HRTEM and mechanical testing. In the research on silicon ... |
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| Chlorodifluoromethane (R-22) Adsorption Equilibrium on BPL Carbon |
JUN 95 |
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| Authors:
David Tevault; John J. Mahle; Leonard C. Buettner; Donna L. Carlile; David Friday; EDGEWOOD RESEARCH DEVELOPMENT AND ENGINEERING CENTER ABERDEEN PROVING GROUND MD
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| Adsorption phase equilibrium data are required for evaluation of any adsorption-based gas separation process. Measurement of adsorption phase equilibrium data for a variety of CW agents and their surrogates on adsorbent materials of interest is being performed to correlate physical properties with filtration/separation efficiencies of each vapor on each adsorbent. This report details the adsorption phase equilibrium data measured for chlorodifluoromethane (R-22) on BPL carbon and unimpregnated activated carbon with ... |
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| Pyrolysis Gas Chromatography/Mass Spectrometry Identification of Elastomeric Materials |
JUN 95 |
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| Authors:
John A. Hiltz; John J. Power; DEFENCE RESEARCH ESTABLISHMENT ATLANTIC DARTMOUTH (NOVA SCOTIA)
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| Elastomers and thermoset polymers can be difficult to identify as a result of their crosslinked Structure. Techniques such as transmission infrared spectroscopy have limited application to these materials because of difficulty in preparing thin films. Surface infrared techniques including multiple internal reflectance and total attenuated reflectance are more useful but their application can be hampered by the presence of additives such as carbon and plasticizers. Pyrolysis coupled with gas chromatographic ... |
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Reports by Keyword(s)
CARBON
