256
256
Jul 12, 2010
07/10
by
Hartop, R.; Johns, C.; Kolbly, R
texts
eye 256
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The design of an X-band exciter and transmitter control system is presented. For the exciter design such aspects as the block diagram, expected oscillator frequency stability, effect of instability of the cables between the control room and the antenna, improvement in uplink stability obtained with the transmitter phase control loop, expected frequency stability of exciter references for the doppler extractors, expected performance of the X-band range modulator, and the frequency stability...
Topics: AEROSPACE ENVIRONMENTS, SPACE PROCESSING, SPACE PROCESSING APPLICATIONS ROCKET, BLACK BRANT...
362
362
Jul 12, 2010
07/10
by
Urlichs, K
texts
eye 362
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Self-excited rotor whirl represents a serious hazard in the operation of turbomachines. The reported investigation has, therefore, the objective to measure the lateral forces acting on the rotor and to determine the characteristic pressure distribution in the rotor clearance area. A description is presented of an approach for calculating the leakage flow in the case of an eccentric rotor position on the basis of empirical loss coefficients. The results are reported of an experimental...
Topics: FINANCE, MARKETING, SPACE COMMERCIALIZATION, SPACE PROCESSING, INVESTMENTS, LIFE CYCLE COSTS, RISK
490
490
May 23, 2011
05/11
by
Thorpe, Arthur N.; Morris, Vernon R
texts
eye 490
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The Center for the Study of Terrestrial and Extraterrestrial Atmospheres (CSTEA) was established in 1992. The center began with 14 active Principal Investigators (PI's). The research of the Center's PIs has, for the most part, continued in the same four areas as presented in the original proposal: Remote Sensing, Atmospheric Chemistry, Sensors and Detectors, and Spacecraft Dynamics.
Topics: DROP TOWERS, SPACE PROCESSING, NUCLEATION, SOLIDIFICATION, SOLUBILITY, WALLS, TEMPERATURE...
Insight is provided into the scientific rotationale for materials processing in space (MPS), and a comprehensive and cohesive approach for implementation and integration of the many, diverse aspects of MPS is described. The programmatic and management functions apply to all projects and activities implemented under MPS. It is intended that specific project plans, providing project unique details, will be appended to this document for endeavors such as the Space Processing Applications Rocket...
Topics: NASA Technical Reports Server (NTRS), CRYSTAL GROWTH, FLUID MECHANICS, GRAVITATION, SPACE...
Pertinent portions of the ground based research are described, including experiments leading to the selection of the flight sample composition: a silica modified gallia-calcia glass. Included are details of the preparation of an approximately .25 in diameter flight sample.
Topics: NASA Technical Reports Server (NTRS), CONTAINERLESS MELTS, CRYSTAL GROWTH, SILICA GLASS, SPACE...
282
282
May 22, 2011
05/11
by
Rohrer, Franz; Ehhalt, Dieter H.; Wahner, Andrea
texts
eye 282
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A simple quasi 2-D model is used to study the zonal distribution of NO(x). The model includes vertical transport in form of eddy diffusion and deep convection, zonal transport by a vertically uniform wind, and a simplified chemistry of NO, NO2 and HNO3. The NO(x) sources considered are surface emissions (mostly from the combustion of fossil fuel), lightning, aircraft emissions, and downward transport from the stratosphere. The model is applied to the latitude band of 40 deg N to 50 deg N during...
Topics: ENCLOSURE, GLOVES, HUMAN FACTORS ENGINEERING, LABORATORY EQUIPMENT, SPACE PROCESSING, DESIGN...
The materials processing experiments in space, conducted on the SPAR 4 Black Brant VC rocket, are described and discussed. The SPAR 4 payload configuration, the rocket performance, and the flight sequence are reported. The results, analyses, and anomalies of the four experiments are discussed. The experiments conducted were the uniform dispersions of crystallization processing, the contained polycrstalline solidification in low gravity, the containerless processing of ferromagnetic materials,...
Topics: NASA Technical Reports Server (NTRS), AEROSPACE ENVIRONMENTS, SPACE PROCESSING, SPACE PROCESSING...
368
368
Jun 17, 2010
06/10
by
Vacca, G. A
texts
eye 368
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Guidance and control, communications, data processing, and instrumentation in space electronics
Topics: DATA PROCESSING, ELECTRONICS, INSTRUMENTS, SPACE PROCESSING, DATA PROCESSING, ELECTRONICS, GUIDANCE...
Potential goals for space industrialization were identified, and evolutionary program options for the realization of those goals were developed and assessed. Program support demands were defined, and recommendations were made in relation to program implementation.
Topics: NASA Technical Reports Server (NTRS), LARGE SPACE STRUCTURES, SPACE INDUSTRIALIZATION, SPACE...
276
276
Sep 20, 2010
09/10
by
Nandi, S.; Edwards, C. D.; Wu, S. C
texts
eye 276
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This paper discusses a covariance study on the feasibility of using station-differenced carrier phase on short baselines to track the TDRSS satellites. Orbit accuracies for the TDRSS using station-differenced carrier phase data and range data collected from White Sands, NM are given for various configurations of ground stations and range data precision. A one-sigma-position position accuracy of 25 meters can be achieved using two orthogonal baselines of 100 km for the station-differenced phase...
Topics: CRYSTAL GROWTH, FURNACES, SOLIDIFICATION, SPACE PROCESSING, SPACE STATION FREEDOM, CERAMICS, GLASS,...
The Space Processing Applications Rocket Project (SPAR) VIII Final Report contains the engineering report prepared at the Marshall Space Flight Center (MSFC) as well as the three reports from the principal investigators. These reports also describe pertinent portions of ground-based research leading to the ultimate selection of the flight sample composition, including design, fabrication, and testing, all of which are expected to contribute immeasurably to an improved comprehension of materials...
Topics: NASA Technical Reports Server (NTRS), ACOUSTIC LEVITATION, FABRICATION, SOLIDIFICATION, SPACE...
An exothermic furnace module was developed to rapidly heat and cool a 0.820-in. (2.1 cm) diameter by 2.75-in. (7.0 cm) long TZM molybdenum alloy crucible. The crucible contains copper, oxygen, and carbon for processing in a low-g environment. Peak temperatures of 1270 C were obtainable 3.5 min after start of ignition, and cooling below 950 C some 4.5 min later. These time-temperature relationships were conditioned for a foam-copper experiment, Space Processing Applications Rocket experiment...
Topics: NASA Technical Reports Server (NTRS), EXOTHERMIC REACTIONS, FURNACES, SPACE PROCESSING, SPACEBORNE...
308
308
Sep 20, 2010
09/10
by
Degroot, Wilhelmus A.; Zupanc, Frank J
texts
eye 308
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Localized velocity, temperature, and species concentration measurements in rocket flow fields are needed to evaluate predictive computational fluid dynamics (CFD) codes and identify causes of poor rocket performance. Velocity, temperature, and total number density information have been successfully extracted from spectrally resolved Rayleigh scattering in the plume of small hydrogen/oxygen rockets. Light from a narrow band laser is scattered from the moving molecules with a Doppler shifted...
Topics: AEROSPACE ENVIRONMENTS, DROP TOWERS, FABRICATION, GROUND TESTS, MICROGRAVITY, SOLIDIFICATION, SPACE...
304
304
May 22, 2011
05/11
by
Royer, Antoin
texts
eye 304
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The Wigner function is argued to be the only natural phase space function evolving classically under quadratic Hamiltonians with time-dependent bilinear part. This is used to understand graphically how certain quadratic time-dependent Hamiltonians induce squeezing of quantum states. The Wigner representation is also used to generalize Ehrenfest's theorem to the quantum uncertainties. This makes it possible to deduce features of the quantum evolution, such as squeezing, from the classical...
Topics: FLUORIDES, GLASS FIBERS, OPTICAL FIBERS, SPACE MANUFACTURING, SPACE PROCESSING, FEASIBILITY,...
520
520
Jul 23, 2010
07/10
by
Flores, Jole
texts
eye 520
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The simulation of a transonic viscous flow over a series of 3-D configurations, ranging from isolated wings to relatively complete aircraft, is presented. A fast, diagonalized Beam-Warming algorithm is used in conjunction with a zonal approach to solve the Euler/Navier-Stokes equations for these applications. The computer code, called Transonic Navier-Stokes, uses four zones for wing configurations and up to 19 zones for more complete aircraft configurations. For the inner zones adjacent to...
Topics: EXPERIMENTATION, ONBOARD EQUIPMENT, SPACE PROCESSING, SPACE STATIONS, TECHNOLOGIES, DESIGN...
For abstract, see N78-25107.
Topics: NASA Technical Reports Server (NTRS), DATA ACQUISITION, ORGANIC MATERIALS, SPACE ERECTABLE...
285
285
May 28, 2011
05/11
by
Gordon, E. M.; Henderson, D. O.; Buffinger, D. R.; Fuller, C. W.; Uribe, R. M
texts
eye 285
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The Consortium for Advancing Renewable Energy (CARET) is a research and education program which uses the theme of renewable energy to build a minority scientist pipeline. CARET is also a consortium of four universities and NASA Lewis Research Center working together to promote science education and research to minority students using the theme of renewable energy. The consortium membership includes the HBCUs (Historically Black Colleges and Universities), Fisk, Wilberforce and Central State...
Topics: ALLOYS, MARANGONI CONVECTION, CRUCIBLES, LIQUID PHASES, METASTABLE STATE, MISCIBILITY GAP,...
A wake shield space processing facility (10) for maintaining ultra-high levels of vacuum is described. The wake shield (12) is a truncated hemispherical section having a convex side (14) and a concave side (24). Material samples (68) to be processed are located on the convex side of the shield, which faces in the wake direction in operation in orbit. Necessary processing fixtures (20) and (22) are also located on the convex side. Support equipment including power supplies (40, 42), CMG package...
Topics: NASA Technical Reports Server (NTRS), SPACE PROCESSING, ULTRAHIGH VACUUM, WAKES, PATENTS, Naumann,...
595
595
Jul 11, 2010
07/10
by
Hufferd, W. L
texts
eye 595
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Characterization tests were conducted on the inert solid propellant cast in the 1/8 scale models of the space shuttle. Static and dynamic tests were carried out to evaluate the interconvertibility of static and dynamic response properties according to linear viscoelasticity theory. These tests were carried out at several temperatures and the time (frequency)- temperature superposition principle used to extend the range of applicability of the data. Tests were also conducted to evaluate the...
Topics: BIOCHEMISTRY, SPACE COMMERCIALIZATION, ELECTROPHORESIS, EXOBIOLOGY, SPACE PROCESSING, AEROSPACE...
472
472
Jul 11, 2010
07/10
by
Buyco, E. H.; Namkoong, D
texts
eye 472
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Present requirements for realistic solar energy system evaluations necessitate a comprehensive body of solar-radition data. The data should include both diffuse and direct solar radiation as well as their total on an hourly (or shorter) basis. In general, however, only the total solar radiation values were recorded. This report presents a correlation that relates the diffuse component of an hourly total solar radiation value to the total radiation ratio of the maximum value attainable. The data...
Topics: BIOTECHNOLOGY, SPACE COMMERCIALIZATION, VIRUSES, CULTURE TECHNIQUES, ELECTROPHORESIS, SPACE...
268
268
Jul 11, 2010
07/10
by
Martin, E. D.; Lomax, H
texts
eye 268
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Revised and extended versions of a fast, direct (noniterative) numerical Cauchy-Riemann solver are presented for solving finite difference approximations of first order systems of partial differential equations. Although the difference operators treated are linear and elliptic, one significant application of these extended direct Cauchy-Riemann solvers is in the fast, semidirect (iterative) solution of fluid dynamic problems governed by the nonlinear mixed elliptic-hyperbolic equations of...
Topics: BIOENGINEERING, SPACE COMMERCIALIZATION, BIOTECHNOLOGY, SPACE PROCESSING, BIOSYNTHESIS, ECONOMIC...
183
183
May 23, 2011
05/11
by
Sha, Yi-Gao; Su, Ching-Hua; Mazuruk, K.; Lehoczky, S. L
texts
eye 183
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The thermal diffusivity of pseudobinary Hg(1-x)Zn(x)Te solids and melts was measured by the laser flash method. The measured diffusivities for the solids of 0.10 less than or equal to x less than or equal to 0.30 are about 60% of that of the HgTe solid. Those for the melts rise rapidly with temperature but less so with increasing x. For x = 0.30, the diffusivity of the melt is about one third of that of the HgTe melt. Using the calculated beat capacity data from the associated solution model...
Topics: SPACE PROCESSING, MICROGRAVITY, CONTAINERLESS MELTS, CRYSTAL GROWTH, LEVITATION MELTING, COOLING,...
393
393
Jul 12, 2010
07/10
by
Slobin, S. D.; Franco, M. M.; Clauss, R. C
texts
eye 393
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Simulated rain tests were carried out to determine the noise temperature contribution of liquid water adhering to the aperture cover material on both a standard DSN X-band feedhorn and on an S/X-band common aperture feedhorn. It was found that for the particular common aperture feedhorn tested, system noise temperature increases were much greater when the plastic horn cover material was old and weathered than when it was new. The age and condition of the aperture cover material is believed to...
Topics: LUNAR SOIL, SOIL SCIENCE, SPACE INDUSTRIALIZATION, CHEMICAL ANALYSIS, ELECTROREFINING, METALS,...
227
227
Jun 17, 2010
06/10
by
Bayevskiy, R. M.; Chekhonadskiy, N. A.; Gazenko, O. G.; Voskresenskiy, A. D.; Yazdovskiy, V. I.; Yegorov, A. D., et al
texts
eye 227
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Investigative and control systems for data processing in space biology
Topics: AEROSPACE MEDICINE, DATA PROCESSING, DATA PROCESSING EQUIPMENT, EXOBIOLOGY, SPACE PROCESSING,...
252
252
Jul 11, 2010
07/10
by
Jones, C. B.; Smetana, F. O
texts
eye 252
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The performance and estimated material costs for several solar preheaters for domestic hot water heaters using isolation levels present in North Carolina are presented. The effects of monthly variations in isolation and the direction of incident radiation are included. Demand is assumed at 13 gallons (49.2 liters) per day per person. The study shows that a closed circulation system with 82 gallons (310 liters) of preheated storage and 53.4 cu ft (4.94 cu m) of collector surface with single...
Topics: BIOENGINEERING, SPACE MANUFACTURING, SPACE PROCESSING, COST ESTIMATES, ECONOMIC DEVELOPMENT,...
781
781
May 27, 2011
05/11
by
Garcia, Roberto; Williams, Robert; Fears, Shaw
texts
eye 781
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A 60,000 lb trust liquid Oxygen (LOX) and rocket propellant #1 (RP-1) rocket engine is being developed at the Marshall Space Flight Center (MSFC) as part of NASA's ongoing effort to lower the cost of access to space. The goal of the program is to demonstrate a low cost rocket engine with acceptable performance. In order to reduce design and development risk, computational fluid dynamics (CFD) analysis was used extensively in the design process, especially in the design of the turbopump. This...
Topics: MICROGRAVITY, SPACE MANUFACTURING, SPACE PROCESSING, SPACEBORNE EXPERIMENTS, METALS, WELDING,...
Topics: NASA Technical Reports Server (NTRS), PHARMACOLOGY, SPACE COMMERCIALIZATION, SPACE...
184
184
Aug 1, 2010
08/10
by
Smart, Anthony E
texts
eye 184
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Scattered light may be studied efficiently by correlation of individual photon detection times. Available photomultipliers and fast digital correlators make these techniques applicable to a variety of subjects. There are many areas where the measurement of velocity is the key to understanding some phenomenon or improving some machine. Measurements which do not modify the situation are highly desirable and optical scattering may often come into this category. In the last ten years, it has become...
Topics: LUNAR EXPLORATION, LUNAR RESOURCES, LUNAR ROCKS, LUNAR SOIL, LUNAR ENVIRONMENT, SPACE...
707
707
May 28, 2011
05/11
by
Lorenzo, Carl F.; Hartley, Tom T
texts
eye 707
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This paper demonstrates the need for a nonconstant initialization for the fractional calculus and establishes a basic definition set for the initialized fractional differintegral. This definition set allows the formalization of an initialized fractional calculus. Two basis calculi are considered; the Riemann-Liouville and the Grunwald fractional calculi. Two forms of initialization, terminal and side are developed.
Topics: COMBUSTION, LOW TEMPERATURE PHYSICS, MICROGRAVITY, PAYLOADS, SPACE PROCESSING, SPACE SHUTTLES, LOW...
323
323
Jul 11, 2010
07/10
by
Buckles, B. P.; Hodges, B. C.; Hsia, P
texts
eye 323
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A theoretical background was established for the compilation process by dividing it into five phases and explaining the concepts and algorithms that underpin each. The five selected phases were lexical analysis, syntax analysis, semantic analysis, optimization, and code generation. Graph theoretical optimization techniques were presented, and approaches to code generation were described for both one-pass and multipass compilation environments. Following the initial tutorial sections, more than...
Topics: CONFERENCES, NASA PROGRAMS, SPACE PROCESSING, AEROSPACE ENVIRONMENTS, AEROSPACE MEDICINE,...
158
158
May 23, 2011
05/11
by
Schachter, Jonatha
texts
eye 158
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The goal of this investigation was to use the improved positions of the Einstein Slew Survey to help identify sources in background fields and; the North Ecliptic Pole region of Ginga data. Our main progress has been on the former of these two goals. In July, 1996, we performed a detailed search of the background regions at Leicester, UK. Only one of the Slew/Ginga fields had a high enough count rate (greater than 3 LAC cts s(exp -1)) for an unambiguous detection, given the known fluctuations...
Topics: ZIRCONATES, AMPOULES, CRYSTALLIZATION, ZIRCONIUM COMPOUNDS, METAL FLUORIDES, OPTICAL FIBERS,...
A bibliography is provided of materials presentations and publications resulting from NAGW-810.
Topics: NASA Technical Reports Server (NTRS), MATERIALS SCIENCE, SPACE PROCESSING, MICROGRAVITY...
860
860
Jul 11, 2010
07/10
by
NON
texts
eye 860
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A bibliography of reports concerning the Search for Extraterrestrial Intelligence is presented. Cosmic evolution, space communication, and technological advances are discussed along with search strategies and search systems.
Topics: APOLLO SOYUZ TEST PROJECT, SPACE COMMERCIALIZATION, WEIGHTLESSNESS, EUTECTICS, HALIDES, SPACE...
The results of investigations of materials processing in space (MPS), space experimentation apparatus, and potential industrial users of MPS commercialization are discussed.
Topics: NASA Technical Reports Server (NTRS), SPACE COMMERCIALIZATION, SPACE INDUSTRIALIZATION, SPACE...
918
918
Sep 20, 2010
09/10
by
Watson, James Francis, II
texts
eye 918
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The goal of any modeling methodology is to develop a mathematical description of a system that is accurate in its representation and also permits analysis of structural and/or performance properties. Inherently, trade-offs exist between the level detail in the model and the ease with which analysis can be performed. Petri nets (PN's), a highly graphical modeling methodology for Discrete Event Dynamic Systems, permit representation of shared resources, finite capacities, conflict,...
Topics: FURNACES, SOLIDIFICATION, SPACE PROCESSING, SPACE STATION FREEDOM, SPACEBORNE EXPERIMENTS, CRYSTAL...
Experiments on the containerless processing of materials in space performed on the flight of the SPAR 6 sounding rocket are described.
Topics: NASA Technical Reports Server (NTRS), CONTAINERLESS MELTS, DROPS (LIQUIDS), EUTECTIC ALLOYS, GLASS,...
A technical exchange agreement to study the effects of processing iron alloys in microgravity is described. Alloy solidification experiments are to be performed in the low-g facilities at Marshall Space Center. Deere is to prepare and evaluate the samples, and perform thermal characterization studies of the furnace used for melting and solidifying the samples. Experiment planning and analysis are to be performed jointly and data shared between the two parties. The technical exchange concept,...
Topics: NASA Technical Reports Server (NTRS), LOW GRAVITY MANUFACTURING, SPACE MANUFACTURING, MELTING,...
Experiments in the field of biotechnology conducted by the USA Apollo and Skylab space probes are described, as well as the joint Soviet-American Apollo-Soyuz Test Project (ASTP). Experiments in electrophoretic separation in space of biological compounds in a liquid medium are detailed. Space processing of vaccines and separation of human and animal cells are described. Methyl-cellulose, a coating for use in electrophoresis was developed. Erythropoietin, which stimulates the formation of red...
Topics: NASA Technical Reports Server (NTRS), BIOTECHNOLOGY, CYTOLOGY, ELECTROPHORESIS, SPACE PROCESSING,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), BIOPROCESSING, CRYSTAL GROWTH, MACROMOLECULES, BIOPHYSICS,...
The principal purpose of this report is to describe a validation process that can be performed in part on the ground prior to launch, and in space for the IVGEN system. The general approach taken is derived from standard pharmaceutical industry validation schemes modified to fit the special requirements of in-space usage.
Topics: NASA Technical Reports Server (NTRS), MICROBIOLOGY, PHARMACOLOGY, MICROGRAVITY, PROVING, WATER...
Ground based experiments were conducted to demonstrate that thermal migration actually operated in glass melts. Thermal migration consistent with the theory was found in one experiment on a borax melt, i.e., there was an approximately linear relation between the bubble diameter and bubble velocity for a given temperature and temperature gradient. It also appeared that nearby bubbles were attracted to one another, which could greatly aid fining. Interpretation of these results was not possible...
Topics: NASA Technical Reports Server (NTRS), GLASS, SPACE PROCESSING, WEIGHTLESSNESS, BUBBLES,...
607
607
Jul 11, 2010
07/10
by
NON
texts
eye 607
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Mechanical devices and drives developed for aerospace applications are described. Satellite flywheels, magnetic bearings, a missile umbilical system, a cartridge firing device, and an oiler for satellite bearing lubrication are among the topics discussed.
Topics: APOLLO SOYUZ TEST PROJECT, WEIGHTLESSNESS, CRYSTAL GROWTH, SPACE PROCESSING, DIFFUSION, NUCLEATION,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), MICROGRAVITY, SPACE PROCESSING, VAPOR PHASES, DIRECTIONAL...
686
686
May 22, 2011
05/11
by
NON
texts
eye 686
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Great progress has been made in the analysis of interplanetary dust particles (IDP's) over the past few years. This workshop provided a forum for the discussion of the following topics: observation and modeling of dust in the solar system, mineralogy and petrography of IDP's, processing of IDP's in the solar system and terrestrial atmosphere, comparison of IDP's to meteorites and micrometeorites, composition of IDP's, classification, and collection of IDP's.
Topics: EMULSIONS, SIZE DISTRIBUTION, SPACE PROCESSING, TEMPERATURE DEPENDENCE, LATEX, MICROGRAVITY,...
Various financial issues involved in commercial space enterprise are discussed. Particular emphasis is placed on the materials processing area: the current state of business plan and financial developments, what is needed for enhanced probability of success of future materials development efforts in attracting financial backing, and finally, the risks involved in this entire business area.
Topics: NASA Technical Reports Server (NTRS), FINANCE, MARKETING, SPACE COMMERCIALIZATION, SPACE...
Current economic evaluation and analytical techniques are applied to decision problems faced by the space bioprocessing program. NASA decision makers are enabled to choose candidate substances, after ranking them according to their potential economic benefit. The determination of appropriate evaluation techniques necessary to obtain measures of potential economic benefits which result from the pursuit of various space bioprocessing endeavors are focused upon. The treatment of each disease is...
Topics: NASA Technical Reports Server (NTRS), DECISION MAKING, ECONOMIC ANALYSIS, SPACE PROCESSING,...
The study objectives of the Spacelab level 4 analysis were defined, along with the most significant results. The approach used in the synthesis and selection of alternate level 4 integration is described; the options included distributed site, lead center, and launch site. Principal characteristics, as well as the functional flow diagrams for each option, are presented and explained.
Topics: NASA Technical Reports Server (NTRS), SPACE PROCESSING, SPACELAB, CHECKOUT, COST EFFECTIVENESS,...
The work performed has covered the following tasks: update commercial users requirements; assess availability of carriers and facilities; shuttle availability assessment; development of optimum accommodations plan; and payload documentation requirements assessment. The results from the first four tasks are presented. To update commercial user requirements, contacts were made with the JEA and CCDS partners to obtain copies of their most recent official flight requests. From these requests the...
Topics: NASA Technical Reports Server (NTRS), SPACE COMMERCIALIZATION, SPACE PROCESSING, SPACE PROGRAMS,...
256
256
Sep 20, 2010
09/10
by
Smith, Guy A.; Kosten, Sue E.; Workman, Gary L
texts
eye 256
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Monotectic alloy materials are created by rapid melt/rapid solidification processing on the NASA KC-135. Separation of the uniform liquid into two liquids may occur by either of two processes; spinodal decomposition or nucleation followed by growth. In the first case, the liquid is unstable to composition waves, which form and grow, giving liquids of two different compositions. In the latter process discrete particles of the second liquid phase form via thermal fluctuations and then grow by...
Topics: DROP TESTS, VACUUM FURNACES, MATERIALS SCIENCE, MICROGRAVITY, SPACE PROCESSING, C-135 AIRCRAFT,...
Research programs in atmospheric science, materials processing in space, and space sciences as well as technology programs in space power, materials processes, and space structures are discussed.
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC CHEMISTRY, ATMOSPHERIC PHYSICS, SPACE PROCESSING,...
