| Prediction of Isothermal Equation of State of an Explosive Nitrate Ester by van der Waals Density Functional Theory |
Jan 2010 |
4 pages |
| Authors:
Aaron C Landerville; Michael W Conroy; Ivan I Oleynik; Carter T White; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
 | A newenergetic material, nitrate ester 1 (NEST-1), has shown promise as a powerful, technologically attractive explosive. Its physical properties under compression, however, are currently unknown. Accurate density functional calculations together with a reliable empirical van der Waals correction are employed to predict the isothermal hydrostatic equation of state for this material prior to any known experimental results. The accuracy of results obtained from this approach was tested against experimentally known ... |
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| Applying State-of-the-Art Technologies to Reduce Escape Times from Fires Using Environmental Sensing, Improved Occupant Egress Guidance, and Multiple Communication Protocols |
06-Feb-2009 |
37 pages |
| Authors:
Frederick W Williams; Thomas T Street; Mark H Hammond; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| In 2006, under contract to the Consumer Product Safety Commission (CPSC), the Naval Research Laboratory (NRL) was tasked with investigating various technology and concepts--such as visual signals and unique audible sounds--that have the potential to improve residential occupant escape in the event of fire. The investigation included an evaluation of the feasibility of incorporating new technologies or concepts to aid escape capabilities and that may improve egress times in residential ... |
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| Cascade Optical Chromatography for Sample Fractionation |
Jan-2009 |
7 pages |
| Authors:
Alex Terray; Joseph D Taylor; Sean J Hart; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| Optical chromatography involves the elegant combination of opposing optical and fluid drag forces on colloidal samples within microfluidic environments to both measure analytical differences and fractionate injected samples. Particles that encounter the focused laser beam are trapped axially along the beam and are pushed upstream from the laser focal point to rest at a point where the optical and fluid forces on the particle balance. In our recent devices particles ... |
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| Rapid Fuel Quality Surveillance Through Chemometric Modeling of Near-Infrared Spectra |
Jan-2009 |
|
| Authors:
Mark H Hammond; Jeffrey A Cramer; Robert E Morris; Kevin J Johnson; Braden C Giordano; Kirsten E Kramer; Susan L Rose-Pehrsson; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
 | The use of liquid fuels necessitates methods to assess the quality and suitability of these fuels for their intended use. Traditionally, this is performed through a series of chemical and physical tests. However, in some operational situations, streamlined methods to reliably evaluate fuel quality would offer distinct advantages. The Naval Research Laboratory has been engaged in a research program to explore and develop rapid automated fuel quality surveillance technologies. Chemometric ... |
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| The Influence of Acidity on Microbial Fuel Cells Containing Shewanella Oneidensis (PREPRINT) |
01-Sep-2008 |
9 pages |
| Authors:
Glenn R Johnson; Justin C Biffinger; Jeremy Pietron; Orianna Bretschger; Lloyd J Nadeau; Cynthia C Williams; Kenneth H Nealson; Bradley R Ringeisen; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| Microbial fuel cells (MFCs) traditionally operate at pH values between 6 and 8. However, the effect of pH on the growth and electron transfer abilities of Shewanella oneidensis MR-1 (wild-type) and DSP10 (spontaneous mutant), bacteria commonly used in MFCs, has not been characterized. Miniature MFCs using bare graphite felt electrodes and nanoporous polycarbonate membranes with MR-1 or DSP10 cultures generated > 8 W/cu m and ~ 400 microA between pH ... |
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| Current Status and Future Research Opportunities for Electrochemical Capacitors: Relevance for Naval and Civilian Applications |
14 MAR 2008 |
20 pages |
| Authors:
Jeffrey W. Long; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| Electrochemical capacitors (ECs) are a class of energy-storage devices that offer significant promise in bridging the performance gap that exists between the high power density derived from electrostatic capacitors and the high energy density of batteries. As such, ECs will ultimately enable technologies and applications, ranging from microelectronics to hybrid- and all-electric vehicle platforms, where current energy-storage devices are not sufficient. Further advances in EC performance and viability will require ... |
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| Geochemical Characterization of Concentrated Gas Hydrate Deposits on the Hikurangi Margin, New Zealand: Preliminary Geochemical Cruise Report |
29 FEB 2008 |
44 pages |
| Authors:
Richard B. Coffin; LeiLa Hamdan; John Pohlman; Warren Wood; Ingo Pecher; Stuart Henrys; Jens Greinert; Kevin Faure; Andrew Gorman; Alan Orpin; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| This report provides a preliminary summary of geochemical contribution to methane hydrate research and exploration on the Hikurangi Margin, off the northeastern coast of New Zealand from June 20 to July 3, 2006. Geochemical porewater profiles taken from shallow piston cores and vertical fluid migration measured with heatflow probing were compared with seismic summaries of potential deep sediment hydrates deposits. Research goals for this expedition include: (1) Refine geophysical, geochemical, ... |
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| Gas Hydrate Exploration, Mid Chilean Coast; Geochemical-Geophysical Survey |
27 DEC 2006 |
63 pages |
| Authors:
Richard B. Coffin; Juan Diaz; Joan Gardner; Javier Sellanes; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| The Naval Research Laboratory (NRL), supported through ONRG-Chile, DOE/NETL, and ONR, participated in a research cruise along the mid-Chilean coast. Specific research topics addressed by NRL in this program include survey and prediction of geotechnical and geoacoustical anomalies, estimation of coastal hydrate distribution, refining protocol for hydrate exploration, and understanding the variation in microbial community diversity in hydrate-rich regions. The Chile-FONDEF goal in this program is to locate hydrates along ... |
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| Passive Badge Assessment for Long-Term, Low-Level Air Monitoring on Submarines: VOC Badge Validation |
18 DEC 2006 |
23 pages |
| Authors:
Kimberly P. Williams; Susan L. Rose-Pehrsson; David A. Kidwell; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| Passive badge monitors for benzene, toluene, and xylene detection (cumulatively) were tested for analyte-specific air analysis onboard U.S. Navy (USN) nuclear submarines. Long-term sampling efficiency was evaluated for a 28-day period by comparing the response of the passive badge to an active tube sampling method. The badges and tubes were exposed to benzene, toluene, and xylene vapors at concentrations ranging from 0.33 to 1.98 ppm, resulting in time-weighted-average exposures ranging ... |
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| Passive Badge Assessment for Long-Term, Low-level Air Monitoring on Submarines: Acrolein Badge Validation |
30 JUN 2006 |
13 pages |
| Authors:
Kimberly P. Williams; Susan L. Rose-Pehrsson; David A. Kidwell; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| Passive diffusion badges are being tested as a long-term, method of analyte-specific air analysis onboard U.S. Navy (USN) nuclear submarines. Passive badge monitors for acrolein detection were tested. Long-term sampling efficiency was evaluated for a 28-day period by comparing the response of the passive badge to an active tube sampling method. The badges and tubes were exposed to acrolein vapor at concentrations of 0.2 and 0.1 ppm, resulting in a ... |
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| A Simple Multichannel Fluidic System for Laminar Flow over Planar Substrates |
21 APR 2006 |
22 pages |
| Authors:
Michael P. Malito; Cy R. Tamanaha; Lloyd J. Whitman; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| We describe the design, assembly, and operation of a multichannel fluidic system for performing laminar flow biochemical assays on planar substrates under optical inspection using standard laboratory microscopes. The basic design uses a reusable elastomer gasket, which forms the fluidic channel, sandwiched between the substrate and a sapphire plate having integrated microfluidic connections. Designs for use with both upright and inverted microscopes are described. |
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| Mechanism of Suppression and Extinguishment of Communication Cable Fire by Ultra Fine Water Mist in Cross-Flow |
14 APR 2006 |
36 pages |
| Authors:
Chuka C. Ndubizu; Ramagopal Ananth; Damian Rouson; Frederick W. Williams; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| Water mist fire suppression experiments were performed in cross-flow on bare (without outer jacket) communication cables to simulate a worst-case scenario. As fine water droplets are injected at low inlet velocities, an initial envelope flame that engulfed the circumference of the cable recedes and forms a wake flame stabilized behind the cable. At high mist concentration and/or high air velocity, the flame is extinguished by flame shrinking rather than by ... |
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| Chemical Structure and Orientation of Ethylene on Si(114)-(2x1)/c(2x2) |
23 JAN 2006 |
|
| Authors:
D. E. Barlow; S. C. Erwin; A. R. Laracuente; L. J. Whitman; Jr Russel J. N.; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| The basic chemical structure and orientation of ethylene chemisorbed on Si(114)-(2 1) at submonolayer coverage is characterized in ultrahigh vacuum using transmission Fourier transform infrared (FTIR) spectroscopy. The spectra are consistent with di-sigma bonding of ethylene to the surface with a preferential molecular orientation over macroscopic lengths. These results are supported by density functional theory (DFT) calculations of vibrational frequencies for optimized ethylene-Si(114) structures occupying the dimer and rebonded atom ... |
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| Evaluation of Submarine Hydraulic System Explosion and Fire Hazards |
29 SEP 2005 |
97 pages |
| Authors:
John B. Hoover; Jean L. Bailey; Heather D. Willauer; Frederick W. Williams; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| Although hydraulic fluids are generally considered to be low flammable liquids, it is known that they can be highly flammable and even explosive in the atomized state. Because submarine hydraulic systems operate at high pressures, it is possible that mists could be produced in the event of a system leak. Large-scale tests were conducted aboard the ex-USS Shadwell test platform, under realistic temperature and pressure conditions, to evaluate the magnitude ... |
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| Detection Limits for Nanoscale Biosensors |
15 FEB 2005 |
6 pages |
| Authors:
Paul E. Sheehan; Lloyd J. Whitman; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| We examine through analytical calculations and finite element simulations how the detection efficiency of disk and wire-like biosensors in unmixed fluids varies with size from the micrometer to nanometer scales. Specifically, we determine the total flux of DNA-like analyte molecules on a sensor as a function of time and flow rate for a sensor incorporated into a microfluidic system. In all cases, sensor size and shape profoundly affect the total ... |
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| Bacterial Metabolism, Aromatic Biodegradation, and Lignin Biogeochemistry in Sediment Cores from Pearl Harbor, Hawaii |
14 APR 2004 |
18 pages |
| Authors:
Michael T. Montgomery; Christopher L. Osburn; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| Heterotrophic bacteria require a source of oxygen to rapidly metabolize complex and recalcitrant carbon sources like lignin, 2,4,6 trinitrotoluene (TNT), and polycyclic aromatic hydrocarbons (PAHs). The activities of burrowing macrofauna can increase oxygenation, which may stimulate bacterial metabolism of PAHs and heterotrophic production. We measured bacterial production, PAH mineralization, and lignin subunit concentration with depth in cores taken from South Loch and Bishop's Point in Pearl Harbor, Hawaii. Bacterial metabolism ... |
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| Water-Soluble and Optically pH-Sensitive Single-Walled Carbon Nanotubes from Surface Modification |
26 JUL 2002 |
3 pages |
| Authors:
Wei Zhao; Chulho Song; Pehr E. Pehrsson; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| There is great interest in using single-walled carbon nanotubes (SWNTs) as nanoscale probes and sensors in biological electronics and optical devices because the electronic and optical properties of SWNTs are extremely sensitive to the surrounding environments. 1-5 For the applications of SWNTs-based sensors in a biological environment, an immediate question is how the sensors respond to the biological conditions such as pH,5c glucose, various ions, and proteins. This study requires ... |
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| Sensitive Capillary Electrophoresis Microchip Determination of Trinitroaromatic Explosives in Nonaqueous Electrolyte Following Solid Phase Extraction |
12 JUL 2002 |
8 pages |
| Authors:
Qin Lu; Greg E. Collins; Matthew Smith; Joseph Wang; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| A capillary electrophoresis (CE) microchip is utilized for the sensitive separation and detection of three trinitroaromatic explosives: 1,3 5- trinitrotoluene (TNT), 1,3 ,5-trinitrobenzene (TNB) and 2,4,6-trinitrophenyl-N- methylnitramine (tetryl), in the presence of 10 other explosives and explosive derivatives in nonaqueous electrolyte (acetonitrile/methanol 87.5/12.5 (v/v), 2. 5 mM NaOH, 1 mM sodium dodecyl sulfate (sDs)). The chemical reaction of bases, e.g. hydroxide or methoxide ions, with trinitroaromatic compounds forms red colored ... |
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| Microgating Carbon Nanotube Field Emitters by In Situ Growth Inside Open Aperture Arrays |
23 FEB 2002 |
4 pages |
| Authors:
David S. Y. Hsu; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| Multiwalled carbon nanotubes were grown using chemical vapor deposition inside small apertures having a horizontal gate and a sidewall insulator spacer. Emission currents up to 140 nA per cell at 63 V have been obtained. These arrays have exhibited a gate current as low as 2.5% of the anode current throughout the entire gate voltage range, representing the lowest gate to anode current ratio of gated nanotube emitters reported to ... |
|
| Integrally Gated Carbon Nanotube-on-Post Field Emitter Arrays |
17 OCT 2001 |
4 pages |
| Authors:
David S. Y. Hsu; Jonathan Shaw; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| Carbon nanotubes (cNT) are excellent field emitters on account of their chemical, structural, and electronic properties, which afford important aspects of robustness that have been lacking in the conventional metal and silicon field emitter arrays (FEA). They possess high current-carrying capacity and mechanical strength. Their small diameters (2-50 nm) and high aspect ratios produce high geometric field enhancement, which remains nearly constant even when material is removed from the end ... |
|
| Bibliography of NRL Works on X-Ray Fluorescence Authored by L. S. Birks, D. B. Brown, J. W. Criss, H. Friedman, and J. V. Gilfrich |
15 OCT 2001 |
30 pages |
| Authors:
Robert R. Whitlock; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| The Naval Research Laboratory (NRL) has made significant contributions to the field of X-ray fluorescence (XRF) analysis. The calculational engine of the computer code NRLXRF still powers a significant fraction of commercial XRF analysis systems. The impact of these achievements was highlighted during the celebration of NRL's 75th Anniversary in preparation for which the top 75 technologies transferred by the Laboratory were selected. Quantitative X-ray Fluorescence Analysis was among the ... |
|
| Copper Sensor for Unattended Marine Operations IV: Exploration of a Dip Probe Approach Using Nafion 117 Membranes |
31 AUG 2001 |
71 pages |
| Authors:
R. A. Lamontagne; J. W. Foerster; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| This study has shown that: (1) the use of the chemical procedure using BCS (the Standard Method) affords both a total copper and copper: (1) analysis; (2) BCP can be imbedded in Nafion 117 by both small batch laboratory procedures and small scale-up using commercial equipment with very similar results; (3) the chemical procedures for analysis are robust and reproducible; and (4) there is a knowledge base for continuing and ... |
|
| Express Tool Delivery Service/Virtual Tool Crib |
31 JAN 2001 |
11 pages |
| Authors:
John Wegand; Keith Lucas; Andrew Seelinger; Luke Davis; Edgar Bellinger; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| The Naval Research Laboratory (NRL), in collaboration with the Naval Sea Systems Command (NAVSEA), has developed a plan to further support the needs of the Fleet under the Capital Investment for Labor Initiative Hand Tools. NRL/ NAVSEA proposes to work with the Navy's Shore Immediate Maintenance Agency (SIMA) to enhance distribution of tools to ships force through SIMA's current tool depot system. The outlined plan describes the role of NAVSEA, ... |
|
| Anacostia Wet Weather Receiving Water Monitoring Survey: Event 3 |
29 JAN 2001 |
117 pages |
| Authors:
J. W. Pohlman; C. S. Mitchell; Cm. M. Miller; R. B. Coffin; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| The Naval Research Laboratory (NRL), working in conjunction with the Metropolitan Washington Council of Governents (MWCOG), monitored overflows of the combined sewer system (CSS) and separate storm water system (SSWS) in the Anacostia River in the Distnct of Columbia. The NRL/MWCOG contribution is part of a larger effort by the District of Columbia Water and Sewer Authonty (WASA) to develop a Long Tenm Control Plan (LTCP) for the combined sewer ... |
|
| Dynamics and Suppression Effectiveness of Monodisperse Water Droplets in Non-Premixed Counterflow Flames |
AUG 2000 |
8 pages |
| Authors:
E. J. Zegers; B. A. Williams; R. S. Sheinson; J. W. Fleming; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| In situ measurements of velocity and size distributions of initially monodisperse water mists of initial diameters ranging from 14 micrometers to 42 micrometers seeded into the air stream of non-premixed propane/air counterflow flames are reported. Droplets were generated piezoelectrically, and the size and velocity distributions and the number density were determined by phase-Doppler particle anemometry. Droplets having initial diameters of 18 micrometers underwent complete vaporization in a counterflow flame at ... |
|
| Results of Multi-Criteria Fire Detection System Tests |
22 MAY 2000 |
77 pages |
| Authors:
Jennifer T. Wong; Daniel T. Gottuk; Susan L. Rose-Pehrsson; Ronald B. Shaffer; Sean Hart; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| A series of tests was conducted to evaluate and improve the multivariate data analysis methods and candidate sensor suites used for the Early Warning Fire Detection (EWFD) system under development. The EWFD system is to provide reliable warning of actual fire conditions in less time with fewer nuisance alarms than commercially available smoke detection systems. Tests were conducted from August 30 - September 3, 1999 onboard ... |
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| Nanoindentation and Contact Stiffness Measurement Using Force Modulation with a Capacitive Load-Displacement Transducer |
MAY 1999 |
7 pages |
| Authors:
S. A. Syed Asif; K. J. Wahl; R. J. Colton; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| We have implemented a force modulation technique for nanoindentation using a three-plate capacitive load-displacement transducer. The stiffness sensitivity of the instrument is ~0.1 N/m. We show that the sensitivity of this instrument is sufficient to detect long-range surface forces and to locate the surface of a specimen. The low spring mass (236 mg), spring constant (116 N/m) and damping coefficient (0.008 Ns/m) of the transducer allows measurement of the damping ... |
|
| A Feasibility Study on Using Physics-Based Modeler Outputs to Train Probabilistic Neural Networks for UXO Classification |
29 APR 1999 |
46 pages |
| Authors:
R. E. Shaffer; S. L. Rose-Pehrsson; J. R. McDonald; S. J. Hart; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| A probabilistic neural network (PNN) has been applied to the detection and classification of unexploded ordnance (UXO) measured using magnetometry data collected using the Multi-sensor Towed Array Detection System (MTADS). Physical parameters obtained from a physics based modeler were used to describe the UXO and scrap targets found at three sites: Badlands Bombing Range (BBR) Target 1 and 2 and the Former Buckley Field. The PNN was trained and tested ... |
|
| Flow Field Considerations for Counter Flow Burners |
1999 |
5 pages |
| Authors:
M. P. Davis; J. W. Fleming; B. A. Williams; H. D. Ladouceur; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| Many computational combustion tools (e.g. Sandia OPPDIF code) of opposed jet, counter flow diffusion flames apply a simplified potential flow model for the fluid flow portion of the problem. The resulting solution (for no flame) yields a stagnation region between the two burners and an axial velocity component that is independent of radius. S.C. Rolon recognized the need for experimental evidence to provide justification for ... |
|
| Viscoelastic Effects in Nanometer-Scale Contacts Under Shear |
1998 |
5 pages |
| Authors:
K. J. Wahl; S. V. Stepnowski; W. N. Unertl; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| We demonstrate the effects of shear modulation on the viscoelastic response of nanometer-scale single-asperity contacts under static and dynamic loading conditions. Contact stiffness and relaxation time are determined for contacts to poly(vinylethylene) using a scanning force microscope (SFM). Knowledge of the torsional stiffness kQ of the SFM cantilever is not required to determine the relaxation time. The relaxation time was several orders of magnitude slower than the bulk relaxation time ... |
|
| Interfacial Disorder in InAs/GaSb Superlattices |
1998 |
25 pages |
| Authors:
M. E. Twigg; B. R. Bennett; P. M. Thibado; B. V. Shanabrook; L. J. Whitman; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| We have addressed the question of interfacial disorder in InAs/GaSb superlattices (SLs) grown by molecular-beam epitaxy using high-resolution transmission electron microscopy, Raman spectroscopy, X-ray diffraction, and in-situ scanning tunnelling microscopy (STM). Our analysis indicates that InSblike interfaces have a roughness of 1 monolayer (ML), for a SL grown on a GaSb buffer layer. For GaAs-like interfaces, however, the interface roughness is found to be 2 ML when the SL is ... |
|
| Oceanic Gas Hydrate: Guidance for Research and Programmatic Development at the Naval Research Laboratory |
31 DEC 1997 |
60 pages |
| Authors:
M. D. Max; R. E. Pellenbarg; B. B. Rath; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| The Naval Research Laboratory (NRL) is assembling an internal research thrust concerning the distribution, materials properties, chemistry, and influence on naval operations of methane hydrate. Methane hydrate is a naturally occurring crystalline assemblage of water and methane molecules. Water molecules form a rigid cage-like structure which traps methane in voids internal to the cage. This report documents output from a workshop covered at NRL to provide guidance on the structure ... |
|
| Methane Hydrate, A Special Clathrate: Its Attributes and Potential |
28 FEB 97 |
77 pages |
| Authors:
M. D. Max; R. E. Pellanbarg; B. G. Hurdle; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| Gas hydrates are pressure-stabilized, ice-like compounds found in the cold deep-ocean environment, especially Polar oceans. Natural gas, primarily methane, is held within a water-molecule crystal lattice and thermodynamically stabilizes the structure via hydrogen bonding. Hydrate readily forms in the Hydrate Stability Zone in which hydrate is thermodynamically stable. This region extends downward from the sediment surface at the sea bottom to a depth determined by the local heat flow and ... |
|
| Carbon Fibres: Structure and Mechanical Properties. |
1994 |
|
| Authors:
L. H. Peebles Jr; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| This paper concerned mmc in some important way and contained information about, utilized, or discussed these subjects: basic topics:, composite materials, data, reinforcement data materials and material types:, c fibers, celion fibers, coatings, fiber coatings, fibers, fibrils, microfibrils, pan fibers, t100 fibers, thornel fibers material characteristics and data fields:, compressive strength, compressive strength data, cte data, fiber data, interfacial shear strength, mechanical properties, modulus data, poisson's ratio, strain data, tensile ... |
|
| Carbonization of High-Temperature Resins. |
1993 |
|
| Authors:
Satya B. Sastri; James P. Armistead; Teddy M. Keller; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| The pyrolysis of two high-temperature thermosetting polymers has been studied as potential carbon precursor materials. Both resins are easily processed into shaped and void-free components. The polymers and corresponding pyrolysates exhibit outstanding thermal properties. As the heat treatment is progressively increased, a carbonaceous mass is produced yielding a high char yield. As the pyrolysis temperature was raised to 700 deg. C, the density increased and remained at a fairly constant ... |
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| OZONE AND OXYGEN ATOM REACTIONS WITH DIMETHYLSULFIDE AND METHANETHIOL IN ARGON MATRICES. |
15 APR 1981 |
|
| Authors:
R. L. MOWERY; R. R. Smardzewski; D. E. TEVAULT; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| GROUND STATE OXYGEN ATOMS, GENERATED BY VISIBLE PHOTOLYSIS OF OZONE, HAVE BEEN REACTED WITH CH3SCH3 AND CH3SH IN ARGON MATRICES. FOR CH3SCH3 A STEPWISE ADDITION TO FORM DMSO AND DIMETHYLSULFONE WAS OBSERVED. METHANETHIOL REACTIONS WITH O ATOMS WERE MORE COMPLEX, LEADING TO PRODUCTION OF CH3SOH, CH3OSH, CH3S(O)H, AND POSSIBLY CH3-SO2-H. THESE RESULTS ARE COMPARED TO THE O + H2S REACTION. THE MATRIX RESULTS ARE ALSO COMPARED TO GAS PHASE STUDIES ... |
|
| Theoretical Considerations Governing the Dehydration of Fuels by Gas Blowing |
FEB 1957 |
21 pages |
| Authors:
John A. Krynitsky; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| The theory governing the removal of free and dissolved water by gas blowing is discussed and equations for pre-dieting the performance of continuous counter current flow drying units are developed using a concept of "effective theoretical plates." From the general equation derived, it is shown that the performance of any particular fuel drying unit is dependent on the efficiency of the drying tower employed (effective number of theoretical plates), the ... |
|
| Chamber Tests with Human Subjects XX. Hypersensitivity to H as Demonstrated by Patch Tests Before and After Chamber Exposure to H Vapor |
15 MAY 1946 |
53 pages |
| Authors:
J. H. Heinen; H. W. Carhart; W. H. Taylor; B. N. Stolp; Jr. Connor J. C.; N. M. Clausen; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| A series of sensitivity tests on men before and after exposure to H vapor is described in this report. Doses of 1, 1/2, 1/4, and 1/8 micrograms of H in mineral oil, worn as closed patches on the forearm for four hours, represented a satisfactory subvesicant level for determining altered sensitivity. The intensity of reaction to patch tests by previously unexposed men showed a marked variation directly proportional to the ... |
|
| Chamber Tests with Human Subjects XVIII. Tests with HN Vapors |
09 JAN 1946 |
47 pages |
| Authors:
J. H. Heinen; W. H. Taylor; B. N. Stolp; Jr. Conner J. C.; N. M. Clausen; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| The calibration and operation of the NRL chamber for the exposure of human subjects to nitrogen mustard vapors is described in detail in the first part of this report. Concentration of HN vapors are established by mean of special design saturators and by a "flash distillation" system. Analysis of the HN vapor is carried out by a colorimetric method based on the reaction with DB-3. Operation of the chamber has ... |
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