Many of the next generation of global climate models will include aerosol schemes which explicitly simulate the microphysical processes that determine the particle size distribution. These models enable aerosol optical properties and cloud condensation nuclei (CCN) concentrations to be determined by fundamental aerosol processes, which should lead to a more physically based simulation of aerosol direct and indirect radiative forcings. This study examines the global variation in particle size...
Topics: NASA Technical Reports Server (NTRS), AEROSOLS, ASTRONOMICAL MODELS, BIAS, PARTICLE SIZE...
A method to characterize particles in rocket exhaust plumes is developed. The particle velocity, size, and material composition are determined from crater characteristics resulting from impacts into aluminum and copper targets passed through the plume. The targets are mounted on a steel arm approximately 21 inches (53 cm) long which is rotated through the plume at sufficient velocity to prevent material failure resulting from thermal effects. A Scanning Electron Microscope (SEM) with secondary...
Topics: NASA Technical Reports Server (NTRS), EXHAUST GASES, ROCKET EXHAUST, PARTICLE SIZE DISTRIBUTION,...
Assessment of the environmental impact of aircraft operations is required by Air Force regulations. This program was undertaken to quantify gaseous and particulate emissions associated with three Air Force turbine engines (TF33-P3, TF33-P7, and J79 (smokeless). The emissions tests were carried out, using a test cell at Tinker AFB, Oklahoma City, OK. All tests employed JP-4 as the fuel, and fuel samples were characterized by standard tests and analyzed for composition. Emissions were measured at...
Topics: DTIC Archive, Spicer, C W, BATTELLE COLUMBUS DIV OH, *JET ENGINE EXHAUST, TEST AND EVALUATION,...
The origin of particulate contamination on the Space Station will mostly be from pre-launch operations. The adherence and subsequent release of these particles during space flight are discussed. Particle size, release velocity, and release direction are important in determining particle behavior in the vicinity of the vehicle. The particulate environment at the principal science instrument locations is compared to the space shuttle bay environment. Recommendations for possibly decreasing the...
Topics: NASA Technical Reports Server (NTRS), CONTAMINANTS, EARTH ORBITAL ENVIRONMENTS, PARTICULATES, SPACE...
The use of near real-time optical techniques is emphasized for the measurement of mid-tropospheric aerosol over the Central Pacific. The primary focus is on measurement of the aerosol size distribution over the range of particle diameters from 0.15 to 5.0 microns that are essential for modeling CO2 backscatter values in support of the laser atmospheric wind sounder (LAWS) program. The measurement system employs a LAS-X (Laser Aerosol Spectrometer-PMS, Boulder, CO) with a custom 256 channel...
Topics: NASA Technical Reports Server (NTRS), AEROSOLS, ATMOSPHERIC COMPOSITION, PARTICLE SIZE...
A comparison between the Phase Doppler Analyzer and the combined measurements from the Particle Measuring Systems Forward Scattering Spectrometer Probe and the Optical Array Probe was conducted in an icing wind tunnel using NASA Icing Research Tunnel spray nozzles to produce the icing cloud. Clouds with a range of volume median diameters from 10 to greater than 50 microns were used for the instrument comparisons. A comparison of the volume median diameter from the Phase Doppler Particle...
Topics: NASA Technical Reports Server (NTRS), DROP SIZE, ICE FORMATION, PARTICLE SIZE DISTRIBUTION,...
Ultrasonic attenuation was measured for cold worked Nickel 200 samples annealed at increasing temperatures. Localized dislocation density variations, crystalline order and colume percent of recrystallized phase were determined over the anneal temperature range using transmission electron microscopy, X-ray diffraction, and metallurgy. The exponent of the frequency dependence of the attenuation was found to be a key variable relating ultrasonic attenuation to the thermal kinetics of the...
Topics: NASA Technical Reports Server (NTRS), COLD WORKING, NICKEL ALLOYS, NONDESTRUCTIVE TESTS,...
Aluminium foils were used on Stardust to stabilize the aerogel specimens in the modular collector tray. Part of these foils were fully exposed to the flux of cometary grains emanating from Wild 2. Because the exposed part of these foils had to be harvested before extraction of the aerogel, numerous foil strips some 1.7 mm wide and 13 or 33 mm long were generated during Stardusts's Preliminary Examination (PE). These strips are readily accommodated in their entirety in the sample chambers of...
Topics: NASA Technical Reports Server (NTRS), ALUMINUM, STARDUST MISSION, METAL FOILS, CRATERS, WILD 2...
Various techniques for the measurement of aerosol properties are described. Methods considered include: solar aureole photographic technique; densitometric techniques; and video electronic isodensity mapper. Other topics briefly discussed include: multiple scattering experiment; multiple scattering computer program; the generation of the Mie theory results; and the NASA/OAST technology workshop.
Topics: NASA Technical Reports Server (NTRS), AEROSOLS, COMPUTER PROGRAMS, MEASURING INSTRUMENTS, PARTICLE...
In order to improve the understanding of particle vitiation effects in hypersonic propulsion test facilities, a quasi-one dimensional numerical tool was developed to efficiently model reacting particle-gas flows over a wide range of conditions. Features of this code include gas-phase finite-rate kinetics, a global porous-particle combustion model, mass, momentum and energy interactions between phases, and subsonic and supersonic particle drag and heat transfer models. The basic capabilities of...
Topics: NASA Technical Reports Server (NTRS), HYPERSONIC FLIGHT, TEST FACILITIES, AIR BREATHING ENGINES,...
A physical interpretation is proposed for the color-color diagram of galaxies which are powered only by star formation. The colors of each galaxy result from the combination of two components: cirrus-like emission from the neutral disk, and warmer emission from regions directly involved in on-going star formation. This approach to modelling the emission is based on dust properties, but independent evidence for it is found in the relation between the color sequence and the luminosity sequence....
Topics: NASA Technical Reports Server (NTRS), ASTRONOMICAL MODELS, COLOR, DUST, GALACTIC STRUCTURE,...
Resource recovery from waste streams in a space habitat is essential to minimize the resupply burden and achieve self-sufficiency. In a Controlled Ecological Life Support System (CELSS) human wastes and inedible biomass will represent significant sources of secondary raw materials necessary for support of crop plant production (carbon, water, and inorganic plant nutrients). Incineration, pyrolysis, and water extraction have been investigated as candidate processes for recovery of these...
Topics: NASA Technical Reports Server (NTRS), CLOSED ECOLOGICAL SYSTEMS, INCINERATORS, BIOMASS, PYROLYSIS,...
Measurements of calibrated backscatter, using two continuous wave Doppler lidars operating at wavelengths 9.1 and 10.6 micrometers were obtained along with cloud particle size distributions in Hurricane Juliette on 21 September 1995 at altitude approximately 11.7 km. Agreement between backscatter from the two lidars and with the cloud particle size distribution is excellent. Features in backscatter and particle number density compare well with concurrent GOES-7 infrared images.
Topics: NASA Technical Reports Server (NTRS), BACKSCATTERING, PARTICLE SIZE DISTRIBUTION, HURRICANES, GOES...
This data set contains the major soil properties of soil samples collected in 1994 at the tower flux sites in the Northern Study Area (NSA). The soil samples were collected by Hugo Veldhuis and his staff from the University of Manitoba. The mineral soil samples were largely analyzed by Barry Goetz, under the supervision of Dr. Harold Rostad at the University of Saskatchewan. The organic soil samples were largely analyzed by Peter Haluschak, under the supervision of Hugo Veldhuis at the Centre...
Topics: NASA Technical Reports Server (NTRS), FORESTS, ECOLOGY, CHEMICAL COMPOSITION, SOIL SAMPLING, SOIL...
The Experiment to Characterize Aircraft Volatile Aerosols and Trace Species Emissions (EXCAVATE) took place at NASA Langley Research Center during January 2002. This ground based study was conducted to examine the role of fuel sulfur content on particulate emissions. Size distributions as a function of engine operating conditions were measured in the exhaust plume of a B-757 at four downstream axial locations (1 m, 10 m, 25 m and 35 m). The engine was run on JP-5 with three different sulfur...
Topics: NASA Technical Reports Server (NTRS), PARTICLE SIZE DISTRIBUTION, TRACE ELEMENTS, PLUMES, EXHAUST...
We report the first quantitative measurements of the ultrafine (20 to 100 nm) and fine (100 nm to 20 m) particulate components of Lunar surface regolith. The measurements were performed by gas-phase dispersal of the samples, and analysis using aerosol diagnostic techniques. This approach makes no a priori assumptions about the particle size distribution function as required by ensemble optical scattering methods, and is independent of refractive index and density. The method provides direct...
Topics: NASA Technical Reports Server (NTRS), AEROSOLS, LUNAR ROCKS, REGOLITH, GEOPHYSICS, PARTICULATES,...
In order to visualize and investigate spray structures, computed tomography technique is applied to analyze droplet information. From the transmitted light intensity through the spray and/or the data of particle size distribution obtained from a Fraunhofer diffraction principle, the quantitative volume of spray droplet or local particle size was calculated and the reconstruction of spray structures was made. The background of computed tomography is described along with some experimental results...
Topics: NASA Technical Reports Server (NTRS), COMPUTER AIDED TOMOGRAPHY, DROPS (LIQUIDS), FUEL INJECTION,...
A Lunar Thermal Energy from Regolith (LUTHER) experiment has been designed and fabricated at the NASA Lewis Research Center to determine the feasibility of using lunar soil as thermal energy storage media. The experimental apparatus includes an alumina ceramic canister (25.4 cm diameter by 45.7 cm length) which contains simulated lunar regolith, a heater (either radiative or conductive), 9 heat shields, a heat transfer cold jacket, and 19 type B platinum rhodium thermocouples. The simulated...
Topics: NASA Technical Reports Server (NTRS), BASALT, HEAT STORAGE, LUNAR ROCKS, REGOLITH, SOLAR DYNAMIC...
This report describes, in detail, the SBIR Phase 2 contracting effort provided for by NASA Contract Number NAS8-38481 in which a prototype Rain Rate Sensor was developed. FWG Model RP101A is a fully functional rain rate and droplet size analyzing instrument. The RP101A is a fully functional rain rate and droplet size analyzing instrument. The RP101A consists of a fiber optic probe containing a 32-fiber array connected to an electronic signal processor. When interfaced to an IBM compatible...
Topics: NASA Technical Reports Server (NTRS), DATA ACQUISITION, FIBER OPTICS, PARTICLE SIZE DISTRIBUTION,...
A realistic computer model for polymorphic crystallization (i.e., initial and final phases with identical compositions), which includes time-dependent nucleation and cluster-size-dependent growth rates, is developed and tested by fits to experimental data. Model calculations are used to assess the validity of two of the more common approaches for the analysis of crystallization data. The effects of particle size on transformation kinetics, important for the crystallization of many systems of...
Topics: NASA Technical Reports Server (NTRS), CRYSTALLIZATION, COMPUTERIZED SIMULATION, GLASS, KINETICS,...
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AlN thin film was prepared over different metal substrates using DC sputtering at various sputtering parameters. The XRD spectra revealed the presence of mixed (cubic and hexagonal) phases for all samples other than samples prepared at 300W with Ar:N2 gas ratio of 14:6. The intensities of cubic phases observed at copper (Cu) substrates increased drastically with high sputtering power and N2 gas flow. Low intensive peak was observed at gas mixer ratio of 14:6. N2 flow and sputtering power...
Topics: AlN, thin film, structural parameters, metal substrates, particle size
The objective of this contract is to conduct theoretical and experimental investigations resulting in the demonstration of beryllium hydride (LMH-2) solid propellants delivering in excess of 280 lbf-sec/lbm at standard conditions. The program consists of three tasks: Analysis and Data Correlation; Formulation and Ballistic Evaluation; and Advanced Concepts. Data correlations were completed and LMH-2 formulations were designed which were predicted to meet the program objective. Beryllium analog...
Topics: DTIC Archive, Keller, R. F., HERCULES POWDER CO MAGNA UT CHEMICAL PROPULSION DIV, *SOLID ROCKET...
The castable explosive, HMX/dinitropropylacrylate, was improved by formulation modifications to obtain higher energy, better physical properties and stability, and greater efficiency in preparation. Use of volatile liquids in mixing operations, special casting techniques, and selection of optimum HMX particle size blends resulted in solids loadings of 87 percent and higher with corresponding detonation velocities exceeding 8600 meters per second. Optimization of monomer inhibitor concentration...
Topics: DTIC Archive, Stott, Barbara A, NAVAL ORDNANCE TEST STATION CHINA LAKE CA, *CASTING, *ESTERS,...
United Technology Center (UTC) has conducted a program to improve and characterize the stability of propellants containing nitronium perchlorate (NP). Major emphasis was placed on the use of uncoated NP, UTREZ prepolymer (carboxy-terminated polyisobutylene), and NTEB crosslinker (a trifunctional aziridine). Reta-coated NP was employed in limited studies. Candidate plasticizers studied included nitroparaffins and paraffinic hydrocarbons. The most promising plasticizers were HMN...
Topics: DTIC Archive, Rudy,Thomas P, UNITED TECHNOLOGY CENTER SUNNYVALE CALIF, *ROCKET PROPELLANTS,...
Pipette analysis and X-ray diffraction techniques were employed to characterize the particle size distribution and clay mineral content of the feldspar, calvert, ball, and jordan soils. In general, the ball, calvert, and jordan soils were primarily clay size particles composed of kaolinite and illite whereas the feldspar soil was primarily silt-size particles composed of quartz and feldspar minerals.
Topics: NASA Technical Reports Server (NTRS), ENVIRONMENT POLLUTION, FELDSPARS, PARTICLE SIZE DISTRIBUTION,...
The effects of multi-disperse distribution of the aerosol population are presented. Single component and multi-component aerosol species on the condensation/nucleation processes which affect the reduction in visibility are described. The aerosol population with a high particle concentration provided more favorable conditions for the formation of a denser fog than the aerosol population with a greater particle size distribution when the value of the mass concentration of the aerosols was kept...
Topics: NASA Technical Reports Server (NTRS), AEROSOLS, AIR POLLUTION, COMBUSTION PRODUCTS, CONTAMINANTS,...
Two one liter grab samples of stratospheric aerosol were returned from each of six U-2 sampling missions. Cloud condensation nuclei (CCN) spectra from each sample were obtained. Interest was centered on the effects of volcanic activity. Spurious particle generation was found to be a serious problem in container 9 LFT and a much smaller problem in container 9 RT. Initial studies of an option for improved sample containers and values were completed. A CCN spectrometer, able to operate at an...
Topics: NASA Technical Reports Server (NTRS), AEROSOLS, PARTICULATE SAMPLING, POLLUTION TRANSPORT,...
The laser velocimeter has been utilized for several years at the Arnold Engineering and Development Center (AEDC) as a flow diagnostics tool. Most applications, following the initial proof-of-concept experiments, have involved relatively complex unknown flow fields in which the more conventional, intrusive techniques had either not been attempted or had yielded unsatisfactory results. A blunt-base nozzle-afterbody base flow study is discussed as a respresentative example of such applications. A...
Topics: NASA Technical Reports Server (NTRS), AFTERBODIES, INOCULATION, LASER ANEMOMETERS, SUPERSONIC FLOW,...
A method has been developed which will determine hydrogen in sub-milligram samples of lunar soil. It consists of heating the sample in a pyroprobe followed by the gas chromatographic determination of hydrogen using the helium ionization detector. Using a 7 foot, 1/8 OD stainless steel column packed with Carbosieve S, 120/140 mesh, hydrogen was well-separated from the other gases released from lunar soil. Standards of hydrogen in helium were used for calibration. The limit to detection under the...
Topics: NASA Technical Reports Server (NTRS), GAS CHROMATOGRAPHY, HYDROGEN, IONIZATION CHAMBERS, LUNAR...
Sensitive VHF Doppler radars have the capability to detect echoes from precipitation particles as well as refractive index irregularities. Researchers used the middle and upper (MU) atmosphere radar at Shigaraki, Japan for tropospheric observations of precipitating atmosphere. They detected precipitation motions simultaneously with the ambient air motion and showed the capabilities of the MU radar in investigating mesoscale structures of meteorological phenomena such as air precipitation...
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC CIRCULATION, DOPPLER RADAR, METEOROLOGICAL RADAR,...
Liquids, such as juices, milk, molten metal and the like are concentrated by forming uniformly-sized, small droplets in a precision droplet forming assembly and deploying the droplets in free fall downwardly as a central column within an evacuated column with cool walls. A portion of the solvent evaporates. The vapor flows to the wall, condenses, and usually flows down the wall as a film to condensate collector and drain. The vertical column of freely falling droplets enters the splash guard....
Topics: NASA Technical Reports Server (NTRS), CONDENSATES, DROPS (LIQUIDS), EVAPORATION, PARTICLE SIZE...
The optical properties of small grains provide the link between the infrared observations presented in Chapter 1 and the dust composition described in Chapter 3. In this session, the optical properties were discussed from the viewpoint of modeling the emission from the dust coma and the scattering in order to draw inference about the dust size distribution and composition. The optical properties are applied to the analysis of the infrared data in several ways, and these different uses should be...
Topics: NASA Technical Reports Server (NTRS), CHEMICAL COMPOSITION, COSMIC DUST, EMISSION SPECTRA, HALLEY'S...
Some important information relevant to the understanding of the gas/dust dynamics near the surface of a comet nucleus concerns knowledge of the grain composition and scattering properties as well as the particle size distribution of dust in the coma. Ground based measurements of light scattered from the dust comae can provide some information about the physical grain properties, in particular about the mean optically dominant grain size. Optical spectra of continua of nine comets presented by...
Topics: NASA Technical Reports Server (NTRS), COLOR, COMET NUCLEI, COSMIC DUST, GRAIN SIZE, HALLEY'S COMET,...
A one dimensional model of cloud microphysics was used to simulate the formation and evolution of polar stratospheric ice clouds. Some of the processes which are included in the model are outlined. It is found that the clouds must undergo preferential nucleation upon the existing aerosols just as do tropospheric cirrus clouds. Therefore, there is an energy barrier between stratospheric nitric acid particles and ice particles implying that nitric acid does not form a continuous set of solutions...
Topics: NASA Technical Reports Server (NTRS), CLOUDS, ICE CLOUDS, ICE FORMATION, MATHEMATICAL MODELS, POLAR...
A cross-linked polyvinyl alcohol battery separator is disclosed. A particulate filler, inert to alkaline electrolyte of an alkaline battery, is incorporated in the separator in an amount of 1-20% by weight, based on the weight of the polyvinyl alcohol, and is dispersed throughout the product. Incorporation of the filler enhances performance and increases cycle life of alkaline batteries when compared with batteries containing a similar separator not containing filler. Suitable fillers include...
Topics: NASA Technical Reports Server (NTRS), ALKALINE BATTERIES, FILLERS, PARTICLE SIZE DISTRIBUTION,...
The atmospheric backscatter coefficient, beta, measured with an airborne CO Laser Doppler Velocimeter (LDV) system operating in a continuous wave, focussed model is discussed. The Single Particle Mode (SPM) algorithm, was developed from concept through analysis of an extensive amount of data obtained with the system on board a NASA aircraft. The SPM algorithm is intended to be employed in situations where one particle at a time appears in the sensitive volume of the LDV. In addition to giving...
Topics: NASA Technical Reports Server (NTRS), ALGORITHMS, ATMOSPHERIC SCATTERING, BACKSCATTERING, ERROR...
The Quartz Crystal Microbalance was calibrated and its response to particle size and mass concentration was determined.
Topics: NASA Technical Reports Server (NTRS), AEROSOLS, MICROBALANCES, PARTICLE SIZE DISTRIBUTION,...
Drop size distribution (DSD) measurements using ground-based disdrometers (point measurements) have often been used to derive equations to relate radar observations to the integral rainfall parameters (Atlas et al. 1999, Bringi et al., 2003, Kozu et al., 2006, Tokay and Short, 1996, Ajayi and Owolabi, 1987, Battan, 1973). Disdrometers such as JWD, MRR and several others have a major limitation in measuring drops with equi-volume diameters (D(sub eq)) larger than 5 mm because they often rely on...
Topics: NASA Technical Reports Server (NTRS), DROP SIZE, SIZE DISTRIBUTION, RADAR MEASUREMENT, RAINDROPS,...
We investigate the accuracy of the frozen-flow approximation (FFA), recently proposed by Matarrese, et al. (1992), for following the nonlinear evolution of cosmological density fluctuations under gravitational instability. We compare a number of statistics between results of the FFA and n-body simulations, including those used by Melott, Pellman & Shandarin (1993) to test the Zel'dovich approximation. The FFA performs reasonably well in a statistical sense, e.g. in reproducing the...
Topics: NASA Technical Reports Server (NTRS), APPROXIMATION, COMPUTATIONAL ASTROPHYSICS, CROSS CORRELATION,...
The influence of preannealing treatments on the polymorphic crystallization of lithium disilicate glasses is examined. As expected, glasses heated at different rates through the temperature range where there is significant nucleation develop widely different numbers of nuclei. This can dramatically influence the stability and transformation characteristics of the annealed glass. Non-isothermal differential scanning calorimetry (DSC) and differential thermal analysis (DTA) measurements are...
Topics: NASA Technical Reports Server (NTRS), NUCLEATION, GLASS, CRYSTALLIZATION, PARTICLE SIZE...
The principal sources of errors during airborne measurements of the ambient electric field and charge are addressed. Results of their analysis are presented for critical survey. It is demonstrated that the volume electric charge has to be accounted for during such measurements, that charge being generated at the airframe and wing surface by droplets of clouds and precipitation colliding with the aircraft. The local effect of that space charge depends on the flight regime (air speed, altitude,...
Topics: NASA Technical Reports Server (NTRS), AIRBORNE EQUIPMENT, ATMOSPHERIC ELECTRICITY, CHARGED...
The impact of particle size and wind speed on brownout cloud development was investigated among various rotary aircraft using Continuum Dynamics, Inc. (CDI) Brownout Analysis Tool, a high physical delity brownout model that is used by both U.S. Army Aviation and NASA for Rotorwash analysis. Simulations were run over 125 di erent combinations of particle size, wind speed, and aircraft type then output data was post-processed to determine a transmissivity and ultimately a visibility value that...
Topics: DTIC Archive, AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF...
A particle-sizing laser interferometer was developed for single particle, in situ sizing and velocity measurement of water droplets in a wind tunnel used for icing studies. Droplet diameters were in the range from 5 to 80 micrometers, flow velocity was in excess of 100 meters per second, and droplet number densities were a few hundred per cubic centimeter. Both off-axis and on- axis light collection designs were evaluated and are described. Variation of the sample volume with particle size is...
Topics: DTIC Archive, Roberds, D W, ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN, *DROPS,...
Generators were constructed to produce both petroleum (SGF-2) and red phosphorus/butyl rubber (RP/BR) smoke aerosols. The petroleum smoke generator produced smoke concentrations of 2 to 10 mg/l for several hours with standard deviations less than 12%. Aerosol particles ranged in size from 0.6 to 1.6 micrometers MMAD with sigma sub g 1.5 to 1.9. Chemical composition of particles was not related to particle size. Using the Battelle-designed exposure chamber, male and female Sprague-Dawley rats...
Topics: DTIC Archive, Ballou, John E, BATTELLE PACIFIC NORTHWEST LABS RICHLAND WA, *AEROSOLS, *TOXIC...
A specially design flow system was constructed to obtain more detailed data on the effect of particle size and concentration on the spark ignition of propellant and explosive dusts. With this apparatus the concentration can be controlled over a 1.5 m (5 ft), and streak photography can be employed to determine the velocity of flames and/or explosion waves. Thus information on both ignition and propagation can be obtained. The ignition characteristics of M1 propellant, RDX, HMX, and ball powder...
Topics: DTIC Archive, Moore,W T, ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ LARGE CALIBER...
As part of the NATO Round-Robin Test program using explosives from one source, the US (ARRADCOM) performed a series of tests on five BICT-furnished explosives. The explosives tested were PETN, RDX, HMX, tetryl and TNT. A series of impact tests were conducted utilizing the 50% Bruceton, the Picatinny Arsenal 10% point and the full run-down test methods. Additional tests, including melting point, chemical analysis, vacuum stability test, explosion temperature, DTA/TGA, DSC, IR, NMR and particle...
Topics: DTIC Archive, Avrami, L, ARMY ARMAMENT RESEARCH AND DEVELOPMENT CENTER DOVER NJ LARGE CALIBER...
As part of the NATO Round-Robin Test program using explosives from one source, the US (ARRADCOM) performed a series of tests on five BICT-furnished explosives. The explosives tested were PETN, RDX, HMX, tetryl and TNT. A series of impact tests were conducted utilizing the 50% Bruceton, the Picatinny Arsenal 10% point and the full run-down test methods. Additional tests, including melting point, chemical analysis, vacuum stability test, explosion temperature, DTA/TGA, DSC, IR, NMR and particle...
Topics: DTIC Archive, Avrami, L, ARMY ARMAMENT RESEARCH AND DEVELOPMENT CENTER DOVER NJ LARGE CALIBER...
This report provides guidance from NIOSH to the Army on a research and data analysis strategy to provide the information needed to systematically evaluate the hazards, exposures, and potential health risks of engineered nanomaterials (ENMs) used in Army materiels. This information will provide support for risk management decision-making. NIOSH and the U.S. Army Public Health Command (PHC) have responsibilities for occupational safety and health related to nanomaterials. NIOSH focuses on workers...
Topics: DTIC Archive, NATIONAL INST FOR OCCUPATIONAL SAFETY AND HEALTH CINCINNATI OH, *HAZARDS,...
Clark Atlanta University (CAU) acquired a Panalytic Empyrean X-Ray diffractometer with wide angle (WAXS) and small angle scattering (SAXS) 1D and 2D capabilities to support its chemistry, physics, and materials science research and education activities. This XRD has become a primary research instrument that is currently utilized in conjunction with other instrumentation at CAU to support research activities in the following areas: (1) Polymer-inorganic nanocomposites; (2) Materials and...
Topics: DTIC Archive, CLARK ATLANTA UNIV GA, *COMPOSITE MATERIALS, *NANOMATERIALS, *X RAY DIFFRACTION, *X...
