| Oxidation of ZrB2 and ZrB2-SiC Ceramics With Tungsten Additions (Preprint) |
Feb-2009 |
11 pages |
| Authors:
S C Zhang; W G Fahrenholtz; G E Hilmas; MISSOURI UNIV-ROLLA DEPT OF MATERIALS SCIENCE AND ENGINEERING
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 | The effect of tungsten additions on the oxidation behavior of zirconium diboride-based ceramics was studied. Four mole percent tungsten carbide was added to ZrB2. The oxidation behavior was studied using thermal gravimetric analysis and isothermal testing in flowing air. Upon heating to 1500 degrees C, the mass gain decreased from approx. 14 milligrams/(square centimeter) for nominally pure ZrB2 to approx. 4.5 milligrams/(square centimeter) for tungsten containing ZrB2. After heating to ... |
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| Characterization of Corrosion on Outdoor-Exposed Aluminum Metal-Matrix Composites as a Function of Reinforcement Specie and Volume Fraction |
FEB 2008 |
52 pages |
| Authors:
Ralph P. Adler; Daniel J. Snoha; George Hawthorn; Lloyd H. Hihara; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| The Hawaii Corrosion Laboratory and the U.S. Army Research Laboratory collaborated to prepare, environmentally expose for up to 2 years, and evaluate multivariant sets of metal matrix composites (MMCs). The experimental matrix involved variations in particulate volume-percent and particulate reinforcement specie (higher purity green and less-pure black silicon carbide, boron carbide, and alumina). The specific objective of this study was to determine, mainly using x-ray powder diffractometry, how observed gravimetric ... |
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| An Analysis of Weight Change in Filters |
AUG 2006 |
18 pages |
| Authors:
Matthew Reilly; George Fultz; Lois Gschwender; SOUTHWESTERN OHIO COUNCIL FOR HIGHER EDUCATION DAYTON
|
| Due to recent repeatability problems with the gravimetric analysis procedure used for military conformance testing of military specification hydraulic fluids, an in-depth investigation was undertaken to evaluate possible sources of error. Many sources of weight change exist, including particulate and water accumulation from air, buildup of static electricity causing interference with the metal microbalance pan, and removal of extractables from filters during testing. Various procedures and filter types were investigated. ... |
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| Safe and Environmentally Acceptable Sol-Gel-Derived Pyrophoric Pyrotechnics |
JUL 2004 |
28 pages |
| Authors:
Randall L. Simpson; William Hubble; Bradley Stevenson; Alexander Gash; Joe Satcher; Patricia Metcalf; LAWRENCE LIVERMORE NATIONAL LAB CA
|
| It was demonstrated that highly porous sol-gel derived iron (III) oxide materials could be reduced to sub-micron-sized metallic iron by heating the materials to intermediate temperatures in a hydrogen atmosphere. Through a large number of experiments complete reduction of the sol-gel based materials was realized with a variety of hydrogen-based atmospheres (25-100% H2 in Ar, N2, CO2, or CO) at intermediate temperatures (350 C to 700 C). All of the ... |
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| Thermal Decomposition Mechanism of 2,2-Bis-(4-Hydroxy-phenyl)-1, 1- Dichloroethylene-Based Polymers |
FEB 2001 |
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| Authors:
Michael L. Ramirez; WILLIAM J HUGHES TECHNICAL CENTER ATLANTIC CITY NJ
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| A Study of the Response of Two Aerosol Photometers When Assessing Organic and Inorganic Dust Concentrations Relative to Standard Gravimetric Methods |
22 AUG 2000 |
68 pages |
| Authors:
Jeremy M. Slagley; AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH
|
| The purpose of this project was to determine the utility of direct reading aerosol photometers for organic dust environments. The study compared the response of two photometers to organic vs. inorganic dust. The results could be explained by the photometer theory to determine the most important aspects of photometric dust exposure assessment in agriculture. The MiniRAM and the HAM were exposed to organic corn grain dust for ... |
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| Characterization of a Polymer Composite Section of Foreign Armor |
MAR 2000 |
42 pages |
| Authors:
James M. Sloan; Seth R. Ghiorse; Donovan Harris; Gumersindo Rodriguez; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| The chemical and physical characterization of a foreign polymer composite of Russian armor was performed. This report has identified and quantified the composition of an unknown cored section of Russian composite armor. The material was identified as a woven glass in an epoxy matrix. The environmental scanning electron microscopy (ESEM) results determined that the reinforcing fiber is E glass, as opposed to S glass or ... |
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| Modeling Decomposition of Unconfined Rigid Polyurethane Foam |
NOV 1999 |
74 pages |
| Authors:
Michael L. Hobbs; Kenneth L. Erickson; Tze Y. Chu; SANDIA NATIONAL LABS ALBUQUERQUE NM
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| The decomposition of unconfined rigid polyurethane foam has been modeled by a kinetic bond-breaking scheme describing degradation of a primary polymer and formation of a thermally stable secondary polymer. The bond-breaking scheme is resolved using percolation theory to describe evolving polymer fragments. The polymer fragments vaporize according to individual vapor pressures. Kinetic parameters for the model were obtained from Thermal Gravimetric Analysis (TGA). The chemical structure of the foam was ... |
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| A Reassessment of the Kinetics of the Thermal Decomposition of the High Explosive, HMX, in the Range 508 K to 524 K, as Studied by Isothermal Gravimetry |
MAR 1998 |
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| Authors:
Daniel J. Whelan; Mark R. Fitzgerald; AERONAUTICAL AND MARITIME RESEARCH LAB MELBOURNE (AUSTRALIA)
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 | In 1986, Bulusu et al. reported on the kinetics of the thermal decomposition of HMX at atmospheric pressure from 508 K to 555 K, using isothermal gravimetric analysis. Their work implied that the decomposition kinetics followed a simple Arrhenius temperature rate law dependency but their analysis did not describe the actual kinetic pathway in any detail. In the present study, some key experiments were repeated. ... |
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| Soil Moisture Determinations Using Capacitance Probe Methodology |
JAN 1998 |
49 pages |
| Authors:
Ronald T. Atkins; Timothy Pangburn; Roy E. Bates; Bruce E. Brockett; COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
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| Determining soil moisture content by measuring the dielectric constant of the soil is not a new concept. However, determining the dielectric constant by measuring capacitance directly rather than through the use of time domain reflectometry (TDR) systems is a relatively new approach to soil moisture measurements. A unique probe assembly and a readout device that measures voltage drop and phase shift were developed and used for direct capacitance measurements. The ... |
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| Visit to Ionospheric Modeling and Remote Sensing Branch, Phillips Laboratory in Hanscom AFB, MA |
02 NOV 94 |
8 pages |
| Authors:
Gary Tuck; ASIAN OFFICE OF AEROSPACE RESEARCH AND DEVELOPMENT APO AP 96337-0007
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| With financial support provided under the AFOSR sponsored Window-on- Science program, Dr Gary Tuck of the University of Queensland, Australia spent a two week tour at Ionospheric Modeling and Remote Sensing Branch, Phillips Laboratory in Hanscom AFB, MA for the purpose of carrying out preliminary discussions with Phillips Lab's gravity group personnel on use of the terrain correction methods. The report provides a scope of Dr Tuck's research in which ... |
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| Chemistry Involving the Separation, Isolation, and Immobilization of Ill-V Compound Semiconductor Nanocrystals and Quantum Dots |
14 SEP 94 |
11 pages |
| Authors:
Richard L. Wells; Louis A. Coury; DUKE UNIV DURHAM NC DEPT OF CHEMISTRY
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| The facile thermolysis of Cl2GaP(SiMe3)22 to eliminate Me3 SiX and yield nanocrystalline GaP has been studied via thermal gravimetric analysis (TGA) and it has been found that the Me3SiCl is eliminated in a step-wise manner. Also, the new ternary single-source precursor Ga2(As,P)C13n has been synthesized and thermolyzed to yield the ternary III-V GaAsxPy. In addition, nanocrystalline GaAs and GaP, prepared by the Kher/Wells low temperature solution phase method, have been ... |
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| Plume Measurement System (PLUMES) Calibration Experiment |
AUG 94 |
153 pages |
| Authors:
Atle Lohrmann; Craig Huhta; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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| The Measurement of Entrainment and Transport work unit under the Dredging Research Program's Technical Area 1, entitled 'Analysis of Dredged Material Placed in Open Water,' developed the PLUmes MEasurement System (PLUMES) to monitor the transport of suspended sediment from dredging and dredged material disposal operations. This acoustic system can monitor nearly synoptically, both horizontally and vertically. To determine the relationship between PLUMES acoustic measurements and suspended sediment concentrations, a laboratory ... |
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| Preparation, Characterization, and Facile Thermolysis of (X2GaP(SiMe3)2) 2 (X = Br, I) and (Cl3Ga2P)n; New Precursors to Nanocrystalline Gallium Phosphide |
18 JAN 94 |
25 pages |
| Authors:
Steven R. Aubuchon; Andrew T. McPhail; Richard L. Wells; Julia A. Giambra; James R. Bowser; DUKE UNIV DURHAM NC DEPT OF CHEMISTRY
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| Br2GaP(SiMe3)2,2 and (I2GaP(SiMe3)2,2 have been prepared by the 1:1 mole ratio reaction of the corresponding gallium(III) halide with (Me3Si)3P. Direct introduction probe mass spectrometry indicates that the former product is dimeric in the gas phase; single-crystal X-ray analysis reveals that it is also dimeric in the solid state and it is isostructural with Cl2GaP(SiMe3)2,2, but the crystals are not isomorphous. Br2GaP(SiMe3)2,2 crystallizes in the orthorhombic system, space group Pbca, with ... |
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| The Oxidation Behaviour of Carbon Fibres. |
1994 |
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| Authors:
Y. Yin; J. G. P. Binner; T. E. Cross; S. J. Marshall; NOTTINGHAM UNIV (UNITED KINGDOM)
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| The oxidation behavior of carbon fibers has been studied in air at different temperatures from 550 to 860 C. A linear relationship has been observed between the carbon fiber size and oxidation time. Experimental results show that the oxidation process is in a mixed control zone, i.e., controlled both by diffusion of the gaseous reactant and product within the boundary layer and by the chemical reaction. The activation energy of ... |
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| The Oxidative Stabilization and Carbonization of Mesophase Pitch |
94 |
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| Authors:
Joseph Drbohlav III; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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| The transformation of mesophase pitch to an ordered carbon by high temperature heat treatment or pyrolysis in an inert atmosphere must be preceeded by a suitable period of thermosetting or oxidative stabilization. The chemical process of oxidative stabilization is not well characterized, although research has clearly indicated that the oxidation history of the mesophase has a profound impact on the mechanical qualities of the resultant carbon product. In this study, ... |
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| Diffusion of Water Vapour Through Cold Gore-Tex(trademark) |
JUL 93 |
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| Authors:
Randall J. Osczevski; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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| A simple gravimetric procedure was devised to measure the water vapour diffusion resistance of waterproof, water vapour permeable textiles at temperatures below freezing. The apparent resistance of a hydrophilic film, part of a Gore-Tex(TM) laminate, increased exponentially with a decrease in temperature. At sub-zero temperatures, water vapour transfer through this film was only a few percent of what it is at room temperature. The diffusion process in such materials is ... |
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| The Enzymatic Mediated Polymerization of Phenol and Aniline Derivatives on a Langmuir Trough |
30 JUN 1993 |
9 pages |
| Authors:
F. F. Bruno; J. A. Akkara; L. A. Samuelson; D. L. Kaplan; K. A. Marx; MASSACHUSETTS UNIV LOWELL DEPT OF CHEMISTRY
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| Enzymatic polymerization of a number of monomers in an ordered lattice on a Langmuir trough (L-T) was investigated. The assembly and polymerization of two mixed monomeric systems consisting of 4- tetradecyloxyphenol (C14PP) with phenol, and 4-hexadecylaniline (C16PA) with aniline, in various ratios were carried out. Polymerization was obtained with C14PP and phenol (in the ratio 1:10), and C16PA and aniline (in the ratio 1:2) on buffered MilliQ water (pH 7.5) ... |
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| Chemical Mechanisms of Toxic Solute Interactions with Soil Constituents |
APR 93 |
200 pages |
| Authors:
Clifford T. Johnson; Martin T. Vala; FLORIDA UNIV GAINESVILLE
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| This report describes fundamental studies on the interaction of several organic solutes commonly found in fuels and solvents with soil and subsurface components. The principal objective was to determine the chemical mechanisms of interaction of these organic molecules and soil sorbents. Ultraviolet, infrared, gravimetric, and matrix-isolation methods were used to characterize the sorption of water and fuel compounds on a model soil consisting of montmorillonite clay. The results showed that ... |
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| Analysis of Deposit Precursors in Jet Fuels Using Fourier Transform Infrared Spectroscopy |
JAN 93 |
53 pages |
| Authors:
William Schulz; David B. Shehee; EASTERN KENTUCKY UNIV RICHMOND DEPT OF CHEMISTRY
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| Thermal oxidation products from jet fuels will be formed in the presence of fuel and oxygen at elevated temperatures. Development of fuels that will not form solid residues depends on the development of a method to analyze the rate of oxidation of fuels. Gravimetric determination of fuel residues was imprecise and time consuming. Gas Chromatography - Mass Spectrometry (GC-MS) of oxidation products yields a great deal of fundamental information but ... |
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| Influence of the Sulfonate Countercation on the Thermal Stability of Nafion (Trade name) Perfluorosulfonate Membranes |
21 DEC 92 |
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| Authors:
Charles R. Martin; Daniel L. Feldheim; Del R. Lawson; COLORADO STATE UNIV FORT COLLINS DEPT OF CHEMISTRY
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| We report in this paper a strong dependence of the thermal stability of Nafion perfluorosulfonate ionomer on the nature of the counterion associated with the fixed sulfonate site. These results were obtained using thermal gravimetric analysis on a series of alkali metal and alkyl ammonium cation- exchanged Nafion films. We have found that the temperature of decomposition of Nafion is inversely dependent on the size of the exchanged cation; i. ... |
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| Properties of Anhydride-Cured Epoxy Filled with Silica Treated with Silane Blends of Amino and Alkyl End Groups |
MAY 91 |
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| Authors:
S. L. Tidrick; H. Ishida; J. L. Koenig; CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF MACROMOLECULAR SCIENCE
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| Cylinders made of a benzyldimethylamine (BDMA)-catalyzed, nadic methyl anhydride (NMA)-cured diglycidyl ether of bishphenol-A (BDGE) were filled with 30 weight % of silica. The silica had previously been treated by silane blends of varying composition, of either gamma-aminopropyltriethoxysilane (APS) and butyltriethoxysilane (BTS) or APS and ethyltriethoxysilane (ETS). A variety of techniques were utilized in order to compare the effects of BTS versus ETS and the concentration of amine in the ... |
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| Standard Method for Measurement of Nonvolatile Residue on Surfaces |
10 AUG 89 |
65 pages |
| Authors:
Eugene N. Borson; Ethel J. Watts; Gloria A. To; AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS
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| Contamination analyses are used to determine if material, components, and subsystems can be expected to meet the performance requirements of a system. Of particular concern is the quantity of molecular contaminants which might be deposited on critical payload surfaces from these sources. This would include all time periods from fabrication, through loading into the vehicle, launching, and during the lifetime of the spacecraft in orbit. A method for determining the ... |
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| The Effect of High Heating Rate on the Pyrolysis of Carbon/Phenolic Composites |
20 SEP 88 |
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| Authors:
M. E. Boyle; R. F. Cozzens; NAVAL RESEARCH LAB WASHINGTON DC
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| The effect of heating rate on the pyrolysis of polymeric and composite materials has been extensively studied using thermal gravimetric analysis (TGA) techniques. Material behavior under conditions of high heating rate (>10000 K/sec) has recently become of great interest because of the need to predict high performance material behavior in harsh thermal environments and to accurately model the interaction of directed energy with polymeric and composite materials, especially with respect ... |
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| Synthesis of Noncrystalline Aromatic Polyamides |
APR 88 |
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| Authors:
Tonson Abraham; E. J. Soloski; R. C. Evers; AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH
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| Noncrystalline thermooxidatively stable aromatic p olyamides were synthesized through the triphenyl phosphite-promoted polycondensations of 3,3- (sulfonylbis(1,4-phenylenoxy)) dibenzoic acid and 3,3(carbonylbis(1,4- phenylenoxy)) dibenzoic acid with 3,3-(1,3-phenylendioxy)dianiline. Alternatively, the polymers could be prepared through the low temperature polydensations in N-methylpyrollidone of the corresponding diacid chlorides with the aromatic diamine. An additional polyamide was synthesized through the self- condensation of 3-(4-(3-aminophenoxybenzoyl)phenoxy) benzoic acid. This previously unreported monomer had been prepared by a two-step ... |
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| Behavioral-Physiological Effects of Red Phosphorous Smoke Inhalation on Two Wildlife Species. Task 1. Inhalation Equipment Development/Ambient CO evaluation/Aerosol Distribution and Air Quality Study |
DEC 87 |
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| Authors:
R. T. Sterner; S. A. Shumake; B. E. Johns; R. D. Thompson; FISH AND WILDLIFE SERVICE DENVER CO DENVER WILDLIFE RESEARCH CENTER
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| Tests to evaluate the spatial and temporal uniformity of red phosphorous - butyl rubber smoke produced in a commercial 1-CuM inhalation chamber are described. Several modifications to the inhalation exposure system aimed at improving air filtration, relative humidity, and temperature control for the conduct of animal studies are also presented. Smoke generation involved the use of a system for the continuous generation of phosphoric acid aerosols. Assessments of spatial and ... |
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| High-Temperature Thermosets Derived from the Diels-Alder Polymerization of Bisbenzocyclobutenes and Bimaleimides |
SEP 87 |
29 pages |
| Authors:
Loon-Seng Tan; Edward J. Soloski; Fred E. Arnold; AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH MATERIALS LAB
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| A number of compatible mixtures of 2,2-bis4-(N-4-benzocyclobutenyl phthalimide-4-phenyl hexafluoropropane (BCB) and 1,1'-(methylene di-4, 1- phenylene) bismaleimide (BMI) were prepared. Complete compatibility of the mixtures was evidence by a single initial t sub g. All mixtures showed relatively low initial t sub g's and characteristic polymerization exotherms of benzocyclobutene-based systems providing and excellent processing window. The cured sample of the mixtures, pure BCB and BMI were subjected to comparative isothermal gravimetric ... |
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| Preparation and Characterization of Cubic ZrO2 Stabilized by Fe(III) and Fe(II) |
15 MAY 87 |
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| Authors:
S. Davison; R. Kershaw; K. Dwight; A. Wold; BROWN UNIV PROVIDENCE RI DEPT OF CHEMISTRY
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| Samples of cubic zirconium oxide contained 2.5at% - 40af% ferric iron were prepared by codecomposition of the nitrates. X-ray powder diffraction analysis and magnetic measurements indicated that alpha iron nitrate and ZRO2 form a solid solution up to 25at% Fe/Zr in the product. At this point, the solubility limit of alpha-Fe2O3 in ZrO2 is exceeded. The reduction of cubic zirconia samples containing 2.5at% - 20at% Fe(III) leads to the stabilization ... |
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| The Effects of Water and Hydrogen on Materials Used in Integrated Circuit Packages |
DEC 84 |
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| Authors:
M. W. Prairie; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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| This investigation determined the adsorption properties of water on RC-5878 polyimide, rolled gold foil, and rolled nickel foil at 20 C, as well as the effects that hydrogen has on nickel foil with a monolayer coverage of water molecules. Adsorption isotherms were obtained using a vacuum ultramicrobalance with a sensibility of 0.1 micrograms per 10 gram load. The microbalance system includes a gas handling system, a stainless steel housing, and ... |
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| Determination of the Effect of Composition, Structure, and Electrochemical Mass Transport Properties on Adhesion and Corrosion Inhibition of Paint Films |
DEC 1983 |
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| Authors:
T. R. Beck; R. T. Ruggeri; ELECTROCHEMICAL TECHNOLOGY CORP SEATTLE WA
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| The transport of sodium and chloride ions and water through six unpigmented paints has been investigated experimentally using a radiotracer method. A previously proposed mass transport model of paints was inadequate to explain the experimental observations. A new mass transport model is proposed and tested. Qualitative agreement between the new model and the experiments is achieved when the effective dielectric constant of the paint is increased above the observed value. ... |
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| Assessment of Means for Determining Deflection of the Vertical |
AUG 1982 |
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| Authors:
W. G. Heller; A. R. LeSchack; S. F. Cushman; ANALYTIC SCIENCES CORP READING MA
|
| This Interim Technical Report documents the first phase of a study of methods for determining deflections of the vertical. In this phase, the astrogeodetic and gravimetric methods have been examined. The objectives of these investigations have been: assessment of the accuracy of alternative astrogeodetic procedures; identification and analysis of potential improvements in astrogeodetic instrumentation; documentation of the gravimetric method and identification of achievable accuracy; development of error models for astrogeodetic ... |
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| Investigation of the Effects of Humidity Exposure on 3501-6/AS Prepreg Material |
30 APR 82 |
127 pages |
| Authors:
D. A. Scola; UNITED TECHNOLOGIES RESEARCH CENTER EAST HARTFORD CT
|
| Humid aging studies of AS/3501-6 prepreg and 3501-6 neat resin at 250C at humidity levels of 0, 31, 51, and 93% RH for time periods of 12, 24, 48, 72, 168 and 336 hrs were carried out. The chemical changes of the resin were followed by infrared spectroscopy (IR), high pressure liquid chromatography (HPLc), and differential scanning calorimetry (Dsc) studies. Mechanical properties of composites fabricated from humid aged prepreg were ... |
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| Field Testing of Geophysical Techniques |
NOV 1981 |
|
| Authors:
Robert L. Costello; D'APPOLONIA CONSULTING ENGINEERS INC PITTSBURGH PA
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| This report presents the results of the Phase II effort to field test geophysical techniques identified during Phase I as being potentially useful for shallow geologic and aquifer analysis. Included in the report is a geologic and physiographic description of the test site and a summary of the field plan. Following is a discussion of field operations and procedures, data processing, results, and a summary which considers the effectiveness of ... |
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| On the Interpolation of Gravity Anomalies and Deflections of the Vertical in Mountainous Terrain |
05 SEP 1981 |
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| Authors:
H. Baussus VON Luetzow; ARMY ENGINEER TOPOGRAPHIC LABS FORT BELVOIR VA
|
| The paper first addresses the interpolation of gravity anomalies in mountainous terrain, to be represented as the sum of a 'signal' variable with a quasi-stationary estimation structure and a computable 'noise' variable without a stationary character. It then develops the particular solution of the boundary value problem of physical geodesy which permits a similar representation of deflections of the vertical and draws some conclusions concerning the inapplicability of Molodensky's series ... |
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| Evaluation of Portable, Direct-Reading Combustible Gas Meters |
SEP 1981 |
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| Authors:
Mohammad A. Hossain; AIR FORCE OCCUPATIONAL AND ENVIRONMENTAL HEALTH LAB BROOKS AFB TX
|
| The USAF Occupational and Environmental Health Laboratory (USAF OEHL) evaluated eight direct-reading, portable combustible gas meters. The evaluation included determination of linearity of response to a calibration gas, response to several different combustible gases and vapors, including JP-4, and the instrument's capability to measure both fire safe limits (below 20% LEL) and levels of health consequence (below 5% LEL). Recommendations of combustible gas meters for specific application can be made ... |
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| Corrosion Inhibiting Engine Oils |
AUG 1981 |
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| Authors:
G. C. Brown; R. J. Meehan; P. A. Warner; PRATT AND WHITNEY AIRCRAFT GROUP WEST PALM BEACH FL GOVERNMENT PRODUCTS DIV
|
| The Fluids, Lubricants, and Elastomers Branch of the Materials Laboratory, AFWAL, established the requirements for a MIL-L-7808H operational oil with corrosion inhibition characteristics at least equal to those of MIL-C- 8188C. The new oil formulation is to provide corrosion inhibition under long- term storage conditions of the ALCM F107 turbine engine. During the initial fifteen-month effort, several approaches were evaluated as candidate methods for determining the effectiveness of corrosion inhibiting ... |
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| Progress in the Global Standardization of Gravity: An Analysis of the Woollard and Rose International Gravity Values, |
Dec-1980 |
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| Authors:
George P Woollard; Valerie M Godley; HAWAII INST OF GEOPHYSICS HONOLULU
|
| The history of improvements in the global standardization of gravity values since the advent of high range gravimeters in 1948 is reviewed. In particular the gravity base values given in SEG special publication International Gravity Measurements (Woollard and Rose, 1963) are evaluated against the most recent set of standardized gravity base values, The International Gravity Standardization Net, 1971 (Morelli et al, 1974). Adjunct IGSN 71 values prepared by the U.S. ... |
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| Erosion of MgO by Solid Particle Impingement at Normal Incidence |
10 SEP 1980 |
|
| Authors:
D. G. Rickerby; N. H. Macmillan; PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB
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| Microgravimetric Techniques for Geotechnical Applications. |
SEP 1980 |
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| Authors:
Dwain K. Butler; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB
|
| Application of high-resolution gravimetry to geotechnical problems is properly termed microgravimetry and is a relatively recent addition to the list of geophysical methods available for geophysical site investigations and other geotechnical applications. This report investigates the applicability of microgravimetry to the wide range of geotechnical problems of interest to the Corps of Engineers. Microgravimetry should be viewed as a complement to other geophysical methods for site investigations. For sites with ... |
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| Mechanisms of Polymer Curing and Thermal Degradation |
DEC 1979 |
|
| Authors:
E. Grant Jones; James M. Pickard; Donald L. Pedrick; SYSTEMS RESEARCH LABS INC DAYTON OH RESEARCH APPLICATIONS DIV
|
| The results of a TGMS analysis of a series of polymers are presented. Sample weight loss and volatile gas evolution during programmed heating of polymers are correlated in order to investigate thermal stability and the mechanism of thermal degradation. Thermal polymerization at 434 K of bis(4-(3- ethynylphenoxy)phenyl)sulfone (I) in the initial stages of reaction and of 4-(3- ethynylphenoxy)phenyl phenyl sulfone (II) up to 90% conversion was found to yield polymers ... |
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| The Crustal Structure and Subsidence History of Aseismic Ridges and Mid-Plate Island Chains. |
SEP 1978 |
|
| Authors:
Robert Sherman Detrick Jr; WOODS HOLE OCEANOGRAPHIC INSTITUTION MASS
|
| This thesis consists of three papers examining problems related to the crustal structure, isostasy and subsidence history of aseismic ridges and mid-plate island chains. Analysis of gravity and bathymetry data across the Ninetyeast and eastern Walvis Ridges indicates these features are locally compensated by an overthickening of the oceanic crust. Maximum crustal thicknesses are 15-30 km. The western Walvis Ridge is also compensated by crustal thickening; however, the isostasy of ... |
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| Use of the 'Markham' Semi-Micro Still for the Determination of Stabilisers in Propellants. Part 1. Determination of Ethyl Centralite at the 3-8% Level. |
MAY 1977 |
|
| Authors:
R. G. Davidson; MATERIALS RESEARCH LABS MARIBYRNONG (AUSTRALIA)
|
| The use of the 'Markham' semi-micro still in the determination of ethyl centralite in propellants is described. The new procedure gives results which compare well with those from the traditional steam distillation-gravimetric method, so that continuity can be assured for propellants undergoing extended accelerated thermal ageing. A determination can be completed within thirty minutes by the new method, compared with 24 hours by the existing method. The apparatus is more ... |
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| Development of Intercalated Graphite Materials. |
AUG 1976 |
|
| Authors:
Lawrence R. Hanlon; MOORE SCHOOL OF ELECTRICAL ENGINEERING PHILADELPHIA PA
|
| Graphite intercalation compounds were prepared from highly-oriented pyrolytic graphite and SbF5 or SbF5-HF mixtures using a variety of techniques. These Compounds were characterized by x-ray and gravimetric analysis, c-axis thickness increase, and in some cases by elemental analysis. Room temperature measurements of the basal-plane electrical conductivity and the .07-2.0 eV (17.7-67 microns) optical reflectance were made. High stage SbF5 compounds were found to exhibit a reflectance of over 90% at ... |
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| Characterization of Amatex-20K |
MAY 1976 |
36 pages |
| Authors:
Carl M. Anderson; Jack M. Pakulak Jr; NAVAL WEAPONS CENTER CHINA LAKE CA
|
| Amatex 20-K is a modification of the proposed alternate fill Amatex- 20. The ammonium nitrate (AN) prills in Amatex-20 are replaced by prills of a solid solution of 10% potassium nitrate (KN) in AN. This substitution changes the temperature at which the large volume change transition of AN occurs from 32 C to 12-15 C, but does not completely eliminate the problem. The chemical and thermal stability of Amatex-20K has ... |
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| Film Breakdown and Pitting. |
21 APR 1975 |
6 pages |
| Authors:
M. Metzger; ILLINOIS UNIV URBANA DEPT OF METALLURGY AND MINING ENGINEERING
|
| Aluminum was studied in sulfuric acid, with chloride to 0.1M, by electron microscopy, polarization and gravimetric methods. Film breakdown and transient pitting occurred in the absence of chloride. Chloride was not found to alter the film; its role was to stabilize pit embryo growth. Stable pit nucleation was conceived as requiring a pit embryo persistent enough to produce sufficient chloride enrichment within the pit. The observed absence of a sharp ... |
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| Determination of Sulfur, Barium, and Silicon in Sebacate-Base Semi-Fluid Lubricants. |
JUL 1974 |
|
| Authors:
George Norwitz; Herman Gordon; FRANKFORD ARSENAL PHILADELPHIA PA
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| Methods are proposed for the determination of sulfur, barium, and silicon in sebacate-base semi-fluid lubricants. Sulfur is determined spectrophotometrically and gravimetrically. In the spectrophotometric method, the sample is treated with nitric, hydrochloric, and perchloric acids, magnesium chloride is added, and the solution is evaporated to dryness. The sulfate is then reduced to hydrogen sulfide by treatment with a mixture of hydriodic, hypophosphorous, and hydrochloric acids and the hydrogen sulfide is ... |
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| Resin/Graphite Fiber Composites |
15 MAR 74 |
131 pages |
| Authors:
P. J. Cavano; TRW INC CLEVELAND OH
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| During the course of the program, techniques were developed that provided thermo-oxidatively stable A-type polyimide/graphite fiber composites using the novel approach of in situ polymerization of monomeric reactants directly on reinforcing fibers, rather than employing separately prepared prepolymer varnish. This was accomplished by simply mixing methylene dianiline and two ester-acids and applying this solution to the fibers for subsequent molding. Five different formulated molecular weight resins were examined, and an ... |
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| Flame Retardant Polyphosphazenes |
DEC 73 |
115 pages |
| Authors:
K. L. Paciorek; D. W. Karle; R. H. Kratzer; ULTRASYSTEMS INC IRVINE CA
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| Six polyphosphazene compositions were prepared by reaction of three bis-tertiary phosphines with two phenyl-s-triazine derived diazides. The diazides and two of the bisphosphines were synthesized since none of these was commercially available. One of the bisphosphines and one of the diazides were successfully prepared for the first time. All six polyphosphazenes produced were completely characterized, four of them were furthermore subjected to isothermal gravimetric analysis, smoke density measurements, flammability and ... |
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| Determination of Water in Rubbers. |
DEC 1973 |
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| Authors:
A. J. Barratt; R. T. M. Fraser; M. J. Healey; EXPLOSIVES RESEARCH AND DEVELOPMENT ESTABLISHMENT WALTHAM ABBEY (ENGLAND)
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| A comparative study has been made of 5 methods for determining moisture in rubbers. The methods are distillation (Dean and Stark), solvent extraction followed by gas chromatography, Karl Fischer titration, the oven gas chromatographic method of Jeffs, and weight loss over phosphorus pentoxide. The weight per cent water contents determined by each method are tabulated. The rubbers are referred to by their generic names, and the compositions were chosen so ... |
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| A Comparison of Observed and Predicted Earth Tide Observations between Alaska and Mexico and Across the Zone of Crustal Transition between Nebraska and Utah, |
DEC 1973 |
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| Authors:
G. P. Woollard; H. C. Marsh; R. L. Longfield; HAWAII INST OF GEOPHYSICS HONOLULU
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| This report contains the key results of the earth tide study reported. Although reference is made to Appendices describing the computer programs employed in reducing the data, carrying out the various earth tide prediction methods evaluated, and the method of harmonic analysis used, these Appendices are not made a part of this report because of their voluminous nature. Those having a special interest in these programs which are written for ... |
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