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oth stiffness and strength, and aging at cryogenic temperature while under load can alter the mechanical properties of pristine, un-aged laminates made of IM7/PETI-5 material. Author Temperature Effects; Polymer Matrix Composites; Cryogenic Temperature; Compressive Strength 20030032245 NASA Glenn Research Center, Cleveland, OH, USA A Thermodynamic Theory of Solid Viscoelasticity. Part 3: Nonlinear Glassy Viscoelasticity, Stability Constraints, Specifications Freed, Alan; Leonov, Arkady I.; Journal of the Mechanics and Physics of Solids; July 03, 2002, pp. 1-17; In English Contract(s)/Grant(s): NCC3-752 Report No.(s): Rept-3/PT3; No Copyright; Avail: CASI; A03, Hardcopy This paper, the last in the series, continues developing the nonlinear constitutive relations for non-isothermal, compressible, solid viscoelasticity. We initially discuss a single integral approach, more suitable for the glassy state of rubber-like materials, with basic functionals involved in the thermodynamic description for this type of viscoelasticity. Then we switch our attention to analyzing stability constraints, imposed on the general formulation of the nonlinear theory of solid viscoelasticity. Finally, we discuss specific (known from the literature or new) expressions for material functions that are involved in the constitutive formulations of both the rubber-like and glassy-like, complementary parts of the theory. Author Nonlinearity; Thermodynamics; Viscoelasticity; Solids; Nonequilibrium Thermodynamics; Glass; Stability 28 PROPELLANTS AND FUELS Includes rocket propellants, igniters, and oxidizers; their storage and handling procedures; and aircraft fuels. For nuclear fuels see 73 Nuclear Physics. For related information see also 07 Aircraft Propulsion and Power; 20 Spacecraft Propulsion and Power; and 44 Energy Production and Conversion. 20030031357 NASA Goddard Space Flight Center, Greenbelt, MD, USA Inconsistent Definitions of the Pressure-Coupled Response and the Admittance of Solid Propellants Cardiff, Eric H.; [2003]; 7 pp.; In English; No Copyright; Avail: CASI; A02, Hardcopy When an acoustic wave is present in a solid propellant combustion environment, the mass flux from the combustion zone oscillates at the same frequency as the acoustics. The acoustic wave is either amplified or attenuated by the response of the combustion to the acoustic disturbance. When the acoustic wave is amplified, this process is called combustion instability. The amplification is quantitatively measured by a response function. The ability to predict combustion stability for a solid propellant formulation is essential to the formulator to prevent or minimize the effects of instabilities, such as an oscillatory thrust. Unfortunately, the prediction of response values for a particular propellant remains a technical challenge. Most predictions of the response of propellants are based on test data, but there are a number of questions about the reliability of the standard test method, the T-burner. Alternate methods have been developed to measure the response of a propellant, including the ultrasound burner, the magnetic flowmeter and the rotating valve burner, but there are still inconsistencies between the results obtained by these different methods. Aside from the experimental differences, the values of the pressure-coupled responses obtained by different researchers are often compared erroneously, for the simple reason that inconsistencies in the definitions of the responses and admittances are not considered. The use of different definitions has led to substantial confusion since the first theoretical treatments of the problem by Hart and McClure in 1959. The definitions and relations derived here seek to alleviate this problem. Derived from text Solid Propellant Combustion; Solid Propellants; Combustion Stability; Acoustics; Coupled Modes; Electrical Impedance; Pressure Oscillations 43
29 SPACE PROCESSING Includes space-based development of materials, compounds, and processes for research or commercial application. Also includes the development of materials and compounds in simulated reduced-gravity environments. For legal aspects of space commercialization see 84 Law, Political Science and Space Policy. 20030022691 NASA Glenn Research Center, Cleveland, OH, USA Washington State Univ., Pullman, WA, USA Effect of Magnetic Fields on g-jitter Induced Convection and Solute Striation During Space Processing of Single Crystals deGroh, H. C.; Li, K.; Li, B. Q.; February 2002; 33 pp.; In English Contract(s)/Grant(s): NAG8-1693; Copyright; Avail: CASI; A03, Hardcopy A 2-D finite element model is presented for the melt growth of single crystals in a microgravity environment with a superimposed DC magnetic field. The model is developed based on the deforming finite element methodology and is capable of predicting the phenomena of the steady and transient convective flows, heat transfer, solute distribution, and solid-liquid interface morphology associated with the melt growth of single crystals in microgravity with and without an applied magnetic field. Numerical simulations were carried out for a wide range of parameters including idealized microgravity conditions, the synthesized g-jitter and the real g-jitter data taken by on-board accelerometers during space flights. The results reveal that the time varying g-jitter disturbances, although small in magnitude, cause an appreciable convective flow in the liquid pool, which in turn produces detrimental effects during the space processing of single crystal growth. An applied magnetic field of appropriate strength, superimposed on microgravity, can be very effective in suppressing the deleterious effects resulting from the g-jitter disturbances. Author Convective Flow; Crystal Growth; Finite Element Method; Magnetic Effects; Microgravity; Single Crystals; Space Processing; Two Dimensional Models; Gravitational Effects 20030032248 NASA Glenn Research Center, Cleveland, OH, USA The Fluids And Combustion Facility Combustion Integrated Rack And The Multi-User Droplet Combustion Apparatus: Microgravity Combustion Science Using Modular Multi-User Hardware OMalley, Terence F.; Myhre, Craig A.; October 02, 2000; 10 pp.; In English; 53rd International Astronautical Congress - The World Space Congress 2002, 10-19 Oct. 2002, Houston, TX, USA; Original contains black and white illustrations Report No.(s): IAC-02-J.5.05; No Copyright; Avail: CASI; A02, Hardcopy The Fluids and Combustion Facility (FCF) is a multi-rack payload planned for the International Space Station (ISS) that will enable the study of fluid physics and combustion science in a microgravity environment. The Combustion Integrated Rack (CIR) is one of two International Standard Payload Racks of the FCF and is being designed primarily to support combustion science experiments. The Multi-user Droplet Combustion Apparatus (MDCA) is a multi-user apparatus designed to accommodate four different droplet combustion science experiments and is the first payload for CIR. The CIR will function independently until the later launch of the Fluids Integrated Rack component of the FCF. This paper provides an overview of the capabilities and the development status of the CIR and MDCA. Author Combustion Chambers; Drops (Liquids); Fluid Dynamics; Microgravity; Spaceborne Experiments; Hardware 31 ENGINEERING (GENERAL) Includes general research topics related to engineering and applied physics, and particular areas of vacuum technology, industrial engineering, cryogenics, and fire prevention. For specific topics in engineering see categories 32 through 39. 20030020929 North Carolina Agricultural and Technical State Univ., Greensboro, NC, USA Integration of NASA Research into Undergraduate Education in Math, Science, Engineering and Technology at North Carolina A&T State University Monroe, Joseph; Kelkar, Ajit; March 31, 2003; 48 pp.; In English; Original contains color illustrations Contract(s)/Grant(s): NCC5-349; Proj. 98-0216; No Copyright; Avail: CASI; A03, Hardcopy The NASA PAIR program incorporated the NASA-Sponsored research into the undergraduate environment at North Carolina Agricultural and Technical State University. This program is designed to significantly improve undergraduate 44
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Mid-latitude forest ecosystems have
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Understanding functional associatio
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cyanobacterial mats, oxygenic photo
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as CIAO/SDP software developers, we
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Exploration Rover (MER) expeditions
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62 COMPUTER SYSTEMS Includes comput
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data in guard cells leads to the pr
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71 ACOUSTICS Includes sound generat
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20030025751 NASA Langley Research C
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analyzed using quantum kinetic theo
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Science Through ARts (STAR) is an e
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85 TECHNOLOGY UTILIZATION AND SURFA
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20030022798 California Inst. of Tec
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mostly at intermediate velocities.
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close to the spacecraft. We then us
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This source had been a bright persi
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the X-ray properties of the cluster
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We revise the physics of primary el
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size of the gullies in relation to
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92 SOLAR PHYSICS Includes solar act
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society, GISS is part of the Earth
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Initial Operation and Checkout of S
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ATMOSPHERIC EFFECTS The Sun’s Imp
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Effect of a BN Interphase that Debo
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Scalability of a Low-Cost Multi-Ter
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DATA TRANSMISSION Reliable Transpor
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Atomic Data for the K-Vacancy State
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FORMATION FLYING A Nonlinear, Six-D
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HIGH TEMPERATURE Alumina Volatility
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Atomic Data for the K-Vacancy State
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MATRICES (MATHEMATICS) A Time Integ
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NASA’s Sentinels Monitoring Weath
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PACIFIC OCEAN Tropospheric Ozone Ov
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PROVING Experimental Verification o
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SACCHAROMYCES Redundancies in Large
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SOLAR CORONA Are CME ‘interaction
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STANDARDS NASA GSFC Mechanical Engi
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TENSILE STRESS Temperature Dependen
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TYPE 3 BURSTS Energetic Particle Pr
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Rayleigh-Taylor Gravity Waves and Q
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Balagadde, Frederick The Electrical
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Casey, Carolyn A. Systems Engineeri
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Donnelly, Michael Performance of th
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Gliebe, Philip Recent Progress in E
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Hughes, S. P. Primer Vector Optimiz
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Kirk, C. Laurence Effective Frequen
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Luckring, J. M. Transonic Reynolds
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Naasz, Bo J. Integrated Orbit and A
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Raffaelle, Ryne Future Photovoltaic
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Shirron, Peter J. A Cryogenic, Insu
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Urban and Rural Ozone Collect over
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Xu, Yun-Jun Coupled Attitude and Or
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