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  • Other Sources  (1,254)
  • LUNAR AND PLANETARY EXPLORATION  (713)
  • STRUCTURAL MECHANICS  (541)
  • Cell & Developmental Biology
  • Inorganic Chemistry
  • 1980-1984  (922)
  • 1970-1974  (332)
  • 1930-1934
  • 1982  (922)
  • 1970  (332)
Collection
Source
Keywords
Years
  • 1980-1984  (922)
  • 1970-1974  (332)
  • 1930-1934
Year
  • 1
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    Transverse deflections of a 45-inch diameter, lightweight mirror blank - Experiment and theory (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Theoretical calculations and holographic measurements on transverse deflections of astronomical mirror blank
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, WASHINGTON OPT. TELESCOPE TECHNOL. 1970; P 287-270
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  • 2
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    Space vehicle response to atmospheric disturbances (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Dynamic analysis to predict space vehicle response to atmospheric disturbances with reference to space shuttle
    Keywords: STRUCTURAL MECHANICS
    Type: SPACE TRANSPORTATION SYSTEM TECHNOL. SYMP., VOL. 2 JUL. 1970; P 331-348
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  • 3
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    Assessment of the potential for load alleviation concepts for space shuttle vehicles (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Load alleviation and structural mode control potential for space shuttle vehicle
    Keywords: STRUCTURAL MECHANICS
    Type: SPACE TRANSPORTATION SYSTEM TECHNOL. SYMP., VOL. 2 JUL. 1970; P 349-363
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  • 4
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    Panel vibration and random loads (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Basic vibration characteristics and random response in thin panels
    Keywords: STRUCTURAL MECHANICS
    Type: SPACE TRANSPORTATION SYSTEM TECHNOL. SYMP., VOL. 2 JUL. 1970; P 43-57
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  • 5
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    Dynamic response of antenna structures in a launch environment (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Communications satellite antenna structure dynamic response to random loads in launch environment
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. LEWIS RES. CENTER SPACE TRANSPORTATION SYSTEM TECHNOL. SYMP., VOL. 2 JUL. 1970; P 301-329
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  • 6
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    Space shuttle staging dynamics (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Staging dynamics for piggyback space shuttles
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. LEWIS RES. CENTER SPACE TRANSPORTATION SYSTEM TECHNOL. SYMP., VOL. 2 JUL. 1970; P 123-142
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  • 7
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    Lifting and control surface flutter (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Lifting and control surface flutter on space shuttles
    Keywords: STRUCTURAL MECHANICS
    Type: SPACE TRANSPORTATION SYSTEM TECHNOL. SYMP., VOL. 2 JUL. 1970; P 177-198
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  • 8
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    Vibration isolation of large masses and vacuum chambers (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Control systems for vibration isolation of large structures and vacuum chambers
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, WASHINGTON OPT. TELESCOPES TECHNOL. 1970; P 733-749
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  • 9
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    Behavior of structural joints and assemblies under thermal environment (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Thermal environment effects on alignment behavior of structural joints and assemblies of reentry vehicle and Mars landing module
    Keywords: STRUCTURAL MECHANICS
    Type: OPT. TELESCOPE TECHNOL. 1970; P 335-349
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  • 10
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    Vibration environment (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Vibration response and acoustic fatigue characteristics of space shuttle thermal protection system design concepts
    Keywords: STRUCTURAL MECHANICS
    Type: SPACE TRANSPORTATION SYSTEM TECHNOL. SYMP., VOL. 2 JUL. 1970; P 273-284
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  • 11
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    Application of dynamic models (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Dynamic model for obtaining response data for space shuttle
    Keywords: STRUCTURAL MECHANICS
    Type: SPACE TRANSPORTATION SYSTEM TECHNOL. SYMP., VOL. 2 JUL. 1970; P 29-42
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  • 12
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    Influence on the POGO effect of the aerodynamic phenomena in a rocket afterbody (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Pogo effect influence on aerodynamic phenomena in rocket afterbody
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. LEWIS RES. CENTER SPACE TRANSPORTATION SYSTEM TECHNOL. SYMP., VOL. 2 JUL. 1970; P 263-265
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  • 13
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    Structural deformation of an orthotropic plate (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Ring reinforcements for damping structural deformation in orthotropic mirror design
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, WASHINGTON OPT. TELESCOPE TECHNOL. 1970; P 283-286
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  • 14
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    Application of finite element techniques to the design and manufacture of astronomical mirrors (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Finite element method for structural design of astronomical mirrors
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, WASHINGTON OPT. TELESCOPE TECHNOL. 1970; P 249-255
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  • 15
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    Transient loading considerations for shuttle design (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Transient loading considerations for shuttle design
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. LEWIS RES. CENTER SPACE TRANSPORTATION SYSTEM TECHNOL. SYMP., VOL. 2 JUL. 1970; P 79-100
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  • 16
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    Assessment of current methods for dynamic analysis of complex structures (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Assessment of techniques for determining eigenvalues of large systems
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. LEWIS RES. CENTER SPACE TRANSPORTATION SYSTEM TECHNOL. SYMP., VOL. 2 JUL. 1970; P 4-27
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  • 17
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    Thermal deformation prediction in orbiting observatory structures (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Using finite element method in analysis and design of optical space telescopes
    Keywords: STRUCTURAL MECHANICS
    Type: OPT. TELESCOPE TECHNOL. 1970; P 401-415
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  • 18
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    Self-weight loaded structures in the context of lightweight mirror applications (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Structural analysis for optimal load carrying substrate members of lightweight astronomical mirror
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, WASHINGTON OPT. TELESCOPE TECHNOL. 1970; P 257-280
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  • 19
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    Checklist for boom selection (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: User checklist for spacecraft boom selection with review of structural, electrical and mechanical properties
    Keywords: STRUCTURAL MECHANICS
    Type: JPL PROC. OF THE 4TH AEROSPACE MECH. SYMP. 15 JAN. 1970; P 51-54
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  • 20
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    Considerations in the design of orbital telescopes for dynamic environments (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Acoustic, vibration, and shock environments in designing orbital telescopes
    Keywords: STRUCTURAL MECHANICS
    Type: OPT. TELESCOPE TECHNOL. 1970; P 389-400
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  • 21
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    Prevention of coupled structure-propulsion instability /POGO/ on the space shuttle (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Coupled structure-propulsion system instability /POGO/ prevention on space shuttle
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. LEWIS RES. CENTER SPACE TRANSPORTATION SYSTEM TECHNOL. SYMP., VOL. 2 JUL. 1970; P 249-262
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  • 22
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    State of the art for panel flutter as applied to space shuttle heat shields (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Supersonic panel flutter of space shuttle heat shields with flexible supports
    Keywords: STRUCTURAL MECHANICS
    Type: SPACE TRANSPORTATION SYSTEM TECHNOL. SYMP., VOL. 2 JUL. 1970; P 199-221
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  • 23
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    A deployment fixture for the simulated zero- gravity testing of a large-area solar array (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Design and development of deployment fixture for simulated zero gravity testing of large area solar array
    Keywords: STRUCTURAL MECHANICS
    Type: JPL PROC. OF THE 4TH AEROSPACE MECH. SYMP. 15 JAN. 1970; P 83-89
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  • 24
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    State of the art materials and design for spacecraft booms (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Mechanical and thermal properties of materials for five spacecraft boom designs
    Keywords: STRUCTURAL MECHANICS
    Type: JPL PROC. OF THE 4TH AEROSPACE MECH. SYMP. 15 JAN. 1970; P 43-45
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  • 25
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    The design of aerospace mechanisms - A customer's opinion (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Customer opinion of design of aerospace mechanisms
    Keywords: STRUCTURAL MECHANICS
    Type: JPL PROC. OF THE 4TH AEROSPACE MECH. SYMP. 15 JAN. 1970; P 91-94
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  • 26
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    Spacecraft booms - Present and future (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Performance summary and spacecraft applications of booms with future trends
    Keywords: STRUCTURAL MECHANICS
    Type: JPL PROC. OF THE 4TH AEROSPACE MECH. SYMP. 15 JAN. 1970; P 55-72
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  • 27
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    Space shuttle liftoff dynamics (1970)
    In:  CASI
    Details
    Publication Date: 2004-10-30
    Description: Space shuttle liftoff dynamics
    Keywords: STRUCTURAL MECHANICS
    Type: SPACE TRANSPORTATION SYSTEM TECNOL. SYMP., VOL. 2 JUL. 1970; P 101-122
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  • 28
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    Space shuttle solid rocket booster water entry cavity collapse loads (1982)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: Solid rocket booster cavity collapse flight measurements included external pressures on the motor case and aft skirt, internal motor case pressures, accelerometers located in the forward skirt, mid-body area, and aft skirt, as well as strain gages located on the skin of the motor case. This flight data yielded applied pressure longitudinal and circumferential distributions which compare well with model test predictions. The internal motor case ullage pressure, which is below atmospheric due to the rapid cooling of the hot internal gas, was more severe (lower) than anticipated due to the ullage gas being hotter than predicted. The structural dynamic response characteristics were as expected. Structural ring and wall damage are detailed and are considered to be attributable to the direct application of cavity collapse pressure combined with the structurally destabilizing, low internal motor case pressure.
    Keywords: STRUCTURAL MECHANICS
    Type: Shock and Vibration Inform. Center The Shock and Vibration Bull., No. 52. Part 2; p 21-26
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  • 29
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    The NASA structural analysis general purpose digital computer program (1970)
    In:  CASI
    Details
    Publication Date: 2006-04-25
    Description: NASA computer program for dynamic structural analysis in stress and thermal deformation problems
    Keywords: STRUCTURAL MECHANICS
    Type: NIFICANT ACCOMPLISHMENTS IN SCI. AND TECHNOL. AT GODDARD SPACE FLIGHT CENTER 1970; P 221-224
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  • 30
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    A study of component design loads due to dynamic environment (1982)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The random vibration of the components of the space shuttle causing internal cargo bay acoustic impingement on the payload was investigated. The import factors to be considered in the design of acoustically loaded structures are the prediction of acoustic environment, prediction of structural response to this environment, and to determine the effect of the response on the structural strength requirements. Two basic responses were analyzed. The primary structure response due to random vibration is first analyzed. The output of primary structure response is used as an input to the secondary structure to calculate the component response.
    Keywords: STRUCTURAL MECHANICS
    Type: Alabama Univ. in Huntsville The 1981 NASA(ASEE Summer Fac. Fellowship Program; 12 p
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  • 31
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    Ray tracing studies of Jupiter's magnetosphere (1982)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: Raypaths for decametric wavelength radiation in Jupiter's magnetosphere were calculated. The model-dependent raypaths with the Voyager observations were compared. Characteristics of the source regions and the influence of propagation effects were deduced. A three dimensional ray tracing program was employed to calculate the raypaths. Families of rays were launched at particular angles with respect to the magnetic field lines to generate conical sheets of radiation for various frequencies and various source locations. As the planet's magnetic field rotates, these warped sheets of radiation sweep past the observer, producing signatures in frequency versus time plots. These signatures match some of those found in the Voyager data. The greatest propagation effects occur in and around the source regions in the Io auroral oval.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Alabama Univ. in Huntsville The 1981 NASA(ASEE Summer Fac. Fellowship Program; 16 p
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  • 32
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    Surface contour of a biaxially strained, doubly curved antenna reflective mesh (1982)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The elastic membrane equations which describe the deflection of a biaxially tensioned reflective mesh from an idealized surface were developed and solved. The conditions of equilibrium of the forces acting on a membrane element furnish equations which may be used to solve a variety of problems. Configurations considered include continuous, as well as incremental mesh attachment to structural members to form shapes which are approximately parabolic or spherical.
    Keywords: STRUCTURAL MECHANICS
    Type: Alabama Univ. in Huntsville The 1981 NASA(ASEE summer Fac. Fellowship Program; 11 p
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  • 33
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    Strain inhomogeneities, molecular chain scission and stress-deformation in polymers (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Bond rupture and fracture in semicrystalline polymers, noting agreement with random length molecular tie chain scission model
    Keywords: STRUCTURAL MECHANICS
    Type: ; TROPHYSICAL JOURNAL
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  • 34
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    An optimum design for the instability of cylindrical shells under lateral pressure (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Optimum design for buckling prevention in cylindrical shells under lateral pressure
    Keywords: STRUCTURAL MECHANICS
    Type: BL. IN STRESS ANALYSIS AND OPTIMUM DESIGN FEB. 1970 (SEE N71-24642 13-32) 13-32/
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  • 35
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    Experimental stress analysis of composite plates with holes (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Stress analysis of unidirectionally reinforced, composite plates with holes
    Keywords: STRUCTURAL MECHANICS
    Type: BL. IN STRESS ANALYSIS AND OPTIMUM DESIGN FEB. 1970 (SEE N71-24642 13-32) 13-32/
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  • 36
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    Stress analysis of thin elasto-plastic shells (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Stress analysis of thin shells with large deflections loaded into strain hardening range
    Keywords: STRUCTURAL MECHANICS
    Type: BL. IN STRESS ANALYSIS AND OPTIMUM DESIGN FEB. 1970 (SEE N71-24642 13-32) 13-32/
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  • 37
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    Exploratory tests on fiber-reinforced plates with circular holes under tension (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Stress concentration on five ply, fiber reinforced plates with circular holes
    Keywords: STRUCTURAL MECHANICS
    Type: BL. IN STRESS ANALYSIS AND OPTIMUM DESIGN FEB. 1970 (SEE N71-24642 13-32) 13-32/
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  • 38
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    Mechanical properties and strengthening mechanisms (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Behavior of various alloys, polymers and composites
    Keywords: STRUCTURAL MECHANICS
    Type: MATER. RES. SEP. 1970; P 37-55
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  • 39
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    Momentum imparted to double-sheet and tubular structures by hypervelocity impact (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Structural configurations effect on momentum imparted to spacecraft by hypervelocity meteoroid impact
    Keywords: STRUCTURAL MECHANICS
    Type: ; ADEMIE DES SCIENCES
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  • 40
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    The stress-strain relations for a nonhomogeneous composite with a circular inclusion (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Stress-strain diagram for nonhomogeneous composite with circular inclusion using Hookes law
    Keywords: STRUCTURAL MECHANICS
    Type: BL. IN STRESS ANALYSIS AND OPTIMUM DESIGN FEB. 1970 (SEE N71-24642 13-32) 13-32/
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  • 41
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    Stresses in a nonhomogeneous elastic plate with a circular hole (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: FORTRAN program for stresses in nonhomogeneous elastic plate with circular hole
    Keywords: STRUCTURAL MECHANICS
    Type: BL. IN STRESS ANALYSIS AND OPTIMUM DESIGN FEB. 1970 (SEE N71-24642 13-32) 13-32/
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  • 42
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    Emerging trends in aeroelasticity (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Aeroelastic and aerothermoelastic development of winged interorbital space shuttle concerning panel flutter, stability and nonstationary lifting surface theory
    Keywords: STRUCTURAL MECHANICS
    Type: ; ADEMIE DES SCIENCES
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  • 43
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    Interaction of large meteoroids with the atmosphere (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Disturbances of the atmosphere at heights of 120 to 40 km by penetration of meteroids of meter and decameter dimensions were examined. Unbiased data on atmospheric penetration of large meteroids was acquired, and their supply of gas and dust components to the middle atmosphere and their connection with the noctilucent clouds were determined.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: International Council of Scientific Unions Middle Atmosphere Program. Handbook for MAP, Vol. 4; p 153-154
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  • 44
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    Anomalies within the system - Rochechouart target rock meteorite (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Contaminated impact crater formations are pertinent to the study of meteoritic contamination at the Cretaceous-Tertiary boundary and other Ir-enriched layers. Target mixing considerations and volumetric estimates of Rochechouart breccias are presently combined with the geochemistry of both major and siderophile trace elements, to evaluate how the chemistry of the preserved target rock-projectile mixture evolved since deposition. Over 99 percent of the mass of extraterrestrial Ir and Os in preserved formations at Rochechouart is located in suevite-like breccias and impact melts. Hydrothermal alteration and/or weathering are the most likely processes to explain both major and trace element redistribution in Rochechouart formations.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 45
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    Progress in fracture mechanics (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Fracture mechanics applications in stress analysis and structural design, considering rocket motor case failure
    Keywords: STRUCTURAL MECHANICS
    Type: ; DIOTEKHNIKA (
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  • 46
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    Filamentary crystal growth associated with impact craters from hypervelocity microparticles (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Filamentary crystal growth associated with hypervelocity microparticles impact upon Cu foil
    Keywords: STRUCTURAL MECHANICS
    Type: ; ADEMIE DES SCIENCES
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  • 47
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    Variational method in the stability analysis of nonconservative problems (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Nonconservative problems motion stability analysis based on restricted admissible displacements, establishing two variational principles
    Keywords: STRUCTURAL MECHANICS
    Type: ; ADEMIE DES SCIENCES
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  • 48
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    Perturbation solution of a hyperbolic equation governing longitudinal wave propagation in certain nonuniform bars (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Longitudinal wave propagation in variable section bars, solving hyperbolic equation of motion by perturbation method
    Keywords: STRUCTURAL MECHANICS
    Type: ; YAL SOCIETY (
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  • 49
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    Determination of normal modes from measured complex modes (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: A technique is presented for computing a set of normal modes from a set of measured complex modes. The number of elements in the modal vectors, which is equal to the number of measurements, can be larger than the number of modes under consideration. It is also shown that the practice of normal mode approximation to complex modes can lead to very large errors when the modes are too complex. A numerical example and a simulated experiment illustrate the concepts discussed and support the theory presented.
    Keywords: STRUCTURAL MECHANICS
    Type: Shock and Vibration Inform. Center The Shock and Vibration Bull., No. 52. Part 5; p 13-17
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  • 50
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    Required developments in structural dynamics (1982)
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    Publication Date: 2011-08-18
    Description: The finite element method, modal component synthesis, and the use of fast Fourier transformation were key developments in structural dynamics in the past 15 to 20 years. Current areas requiring additional effort include: (1) the correct calculation of modal shape and natural frequencies for complex structures; (2) the correlation of math models with test data; (3) the establishment of a criteria for "goodness" of the correlation between analysis and test; (4) the selection of the correct displacement functions when using computer programs for modal synthesis; (5) accuracy of response calculations; and (6) the inverse problem of determining the force problem from the response data. Trends identified include the use of distributed computing, greater reliance on analysis, and the possible use of artificial intelligence techniques, or some way of feeding back information, to provide solution guidance to engineers.
    Keywords: STRUCTURAL MECHANICS
    Type: Shock and Vibration Inform. Center The Shock and Vibration Bull., No. 52. Part 1; p 49-54
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  • 51
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    The spectrum of comets as derived from IUE observations (1982)
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    Publication Date: 2011-08-18
    Description: Eight comets were observed with the IUE at various-heliocentric and geocentric distances. Their UV spectra are remarkably similar despite the large differences in the dust to gas ratios. Since all the dominant atomic species (except N) radicals and ions of the coma are detected in this spectral region, the total gaseous output of the nucleus can be estimated. The abundance of the carbon atom-bearing species is still not very well known and there are indications that the CO content of the coma could vary from comet to comet.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: ESA 3rd European IUE Conf.; p 445-449
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  • 52
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    Analysis of photometric spectra of 17 meteors (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The initial phase of the photometry which involved 17 meteor spectra consisting of eight Geminid spectra, six Orionid spectra and three Eta Aquarid spectra is discussed. Among these 17 spectra it is found that the Geminid spectra are of the best quality and are used for the identification of the atomic lines and molecular bands that normally appear on video tape spectra. The data from the Geminid records are used for developing calibration techniques in photometry. The Orionid and Eta Aquarid spectra are chosen for early analysis because of the current interest in all physical and chemical data relating to Comet Halley.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Meteors and Meteor Spectra Anal.; 9 p
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  • 53
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    The usage of substructuring analyses in the Get Away Special (GAS) program (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The use of automatic multi-stage substructing analysis is demonstrated for a hypothetical case of a GAS container supported by structural channels with a simulated experimental package inside the container. The GAS program purpose is stated and potential candidate structures to support experimental packages are discussed. The GAS container model and the substructuring analysis capabilities of NASTRAN make it possible to study the experiments inside the container as well as the design constraints resulting from the support structures holding the containers. The use of substructuring in the GAS program could be an important factor in increasing the number of flight opportunities.
    Keywords: STRUCTURAL MECHANICS
    Type: Georgia Univ. 10th NASTRAN User's Colloq.; p 204-215
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  • 54
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    Morphology of volcanoes (1982)
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    Publication Date: 2011-08-18
    Description: The effects of chemical composition of the lava, physical processes of volcanic formation, and lava flow lengths on the morphology of Earth volcanoes were investigated. Difficulties in investigating volcanic morphology are discussed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Advan. in Planetary Geol.; p 565-568
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  • 55
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    Chemistry and evolution of Titan's atmosphere (1982)
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    Publication Date: 2011-08-18
    Description: The chemistry and evolution of Titan's atmosphere are reviewed, in light of the scientific findings from the Voyager mission. It is argued that the present N2 atmosphere may be Titan's initial atmosphere, rather than one photochemically derived from an original NH3 atmosphere. The escape rate of hydrogen from Titan is controlled by photochemical production from hydrocarbons. CH4 is irreversibly converted to less hydrogen-rich hydrocarbons, which over geologic time accumulate on the surface to a layer thickness of about 0.5 km. Magnetospheric electrons interacting with Titan's exosphere may dissociate enough N2 into hot, escaping N atoms to remove about 0.2 of Titan's present atmosphere over geologic time. The energy dissipation of magnetospheric electrons exceeds solar EUV energy deposition in Titan's atmosphere by an order of magnitude, and is the principal driver of nitrogen photochemistry. The environmental conditions in Titan's upper atmosphere are favorable to building up complex molecules, particularly in the north polar cap region.
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  • 56
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    Production of nitric oxide by lightning on Venus (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The first measurements of the production of nitric oxide (NO) by a laboratory discharge in a simulated Venus atmosphere are presented. The average NO yield over a range of energies was found to be 3.7 + or - 0.7 x 10 to the 15th molecules/joule. Simultaneous measurements of carbon monoxide (CO) resulting from the lightning-induced dissociation of carbon dioxide (CO2) indicated a CO yield of about 4 x 10 to the 17th molecules/joule. These measurements suggest that at and below cloud level, a region where solar ultraviolet radiation cannot penetrate, the dissociation of CO2 by lightning may be a significant source of oxygen atoms. Depending on the assumed value for the total energy dissipated by lightning on Venus, the production of NO by lightning may be a significant sink of atmospheric nitrogen over the history of Venus.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters; 9; Aug. 198
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  • 57
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    Evidence for a distant /greater than 8,700 R sub J/ Jovian magnetotail - Voyager 2 observations (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: (Previously announced in STAR as N82-18106)
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters; 9; Aug. 198
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  • 58
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    Quasi-periodic climate changes on Mars - A review (1982)
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    Publication Date: 2011-08-18
    Description: The current understanding of the manner in which astronomical variations modulate the Martian climate and thereby lead to the occurrence of laminated polar terrain is considered. The seasonal cycles of dust, carbon dioxide and water, and their responses to astronomical variations, are studied. After an assessment of the way in which these cycles presently operate, for which pertinent spacecraft and ground-based observations are extant, attempts to predict how these cycles may differ under conditions of high and low obliquity and eccentricity are discussed. Attention is given not only to those areas in which there is broad agreement, but also to the controversial and speculative. Key questions include the proportion of dust and water ice in the laminae and its variations within individual layers, the relative importance of older laminae and lower-latitude material as sources of new laminae, and the factors responsible for the youth of the laminated terrain.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 59
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    Photoclinometric determination of the topography of the Martian north polar cap (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Photoclinometry is useful for the determination of topography for areas which have a uniform albedo. The technique is applied to early spring Viking images of the Martian north polar cap, taken when the surface was covered by a nearly uniform frost cover. Unlike earlier approaches, the topographic profiling can be used for surfaces with any photometric function, but the strike of the planetary surface relative to the illumination angle must be specified along the profile. The resultant profiles are relatively insensitive to misestimation of the photometric function and slope orientation, but are quite sensitive to the assumed values of the reflectance of an equivalent level surface and the atmospheric opacity (if it is large).
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  • 60
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    Stability of negatively charged dust grains in Saturn's ring plane (1982)
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    Publication Date: 2011-08-18
    Description: The boundary between the inner and outer parts of Saturn's B ring is located at the theoretical limit of stability of dust grains with large negative charge to mass ratio. A grain inside of this stability limit will move along magnetic field lines and strike Saturn if given a slight velocity component normal to the ring plane. Outside of this marginal stability radius, a perturbed grain merely oscillates back and forth through the ring plane. The theoretical location of the marginal stability radius is at 1.625 Saturn radius. Observations by Pioneer 11 and Voyager 2 in the infared see the boundary as a prominent change in ring brightness at this radius. The occultation of delta-Scorpii by the rings in the ultraviolet seen by Voyager 2 shows about a factor of two change in optical depth beginning very close to this radius.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 87; Aug. 1
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  • 61
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    The Lappajarvi meteorite crater, Finland - Petrography, Rb-Sr, major and trace element geochemistry of the impact melt and basement rocks (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta; 46; July 198
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  • 62
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    On the location of acid-hydrolysable carbon in lunar soil fines (1982)
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    Publication Date: 2011-08-18
    Description: Soil fines exposed on the lunar surface accumulate small metallic iron particles and solar wind-derived carbon. In previous work, it has been suggested that an intimate association exists between one particular carbon phase, hydrolysable carbon, and very fine iron droplets, where the carbon is in solid solution in the iron. The earlier hypothesis of a constant carbon in iron concentration across a broad range of droplet sizes is testable by combining hydrolysable carbon determinations with a variety of magnetic measurements sensitive to different droplet diameters. New measurements of ferromagnetic resonance response on density and magnetic separates from size fractions of soil 12023 are interpreted as evidence that hydrolysable carbon is preferentially associated with the larger, magnetically stable single-domain iron particles rather than with the smaller superparamagnetic droplets. For the former, there is a quite uniform ratio of iron to carbon both within a series of separates from a single soil, and among soils of widely varying FeO content.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth and Planetary Science Letters; 59; 1, Ju; June 198
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  • 63
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    Theory of radio occultation by Saturn's rings (1982)
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    Publication Date: 2011-08-18
    Description: The radio occultation technique, as applied to Saturn's rings, is developed as a new method for the study of the physical properties of planetary ring systems. The rings are treated as a Doppler-spread radar target composed of an ensemble of discrete scatterers. The mathematical formulation of the received signal as a random-phasor-sum process is carried out following a conventional radar theory approach, providing a convenient starting point for deriving coherent signal parameters. A classical result is rederived for the equivalent refractive index of the medium. The analysis is generalized to include ringlets of arbitrary width and it is shown that when the width is such that two adjacent rays are differentially perturbed in phase, ray bending that causes focusing of the coherent signal may result. The diffuse component is also treated in detail.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 49; Feb. 198
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  • 64
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    Structure of the Venus mesosphere and lower thermosphere from measurements during entry of the Pioneer Venus probes (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Data on the thermal structure of the nightside middle atmosphere of Venus, from 84 to 137 km altitude, have been obtained from analysis of deceleration measurements from the third Pioneer Venus small probe, the night probe, which entered the atmosphere near the midnight meridian at 27 deg S latitude. Comparison of the midnight sounding with the morning sounding at 31 deg S latitude indicates that the temperature structure is essentially diurnally invariant up to 100 km, above which the nightside structure diverges sharply from the dayside toward lower temperatures. Very large diurnal pressure differences develop above 100 km with dayside pressure ten times that on the nightside at 126 km altitude. This has major implications for upper atmospheric dynamics. The data are compared with the measurements of Keating et al. (1980) above 140 km, with theoretical thermal structure models of Dickinson, and with data obtained by Russian Venera spacecraft below 100 km. Midnight temperatures are approximately 130 K, somewhat warmer than those reported by Keating et al.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 49; Jan. 198
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  • 65
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    The Mars reference atmosphere (1982)
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    Publication Date: 2011-08-18
    Description: A nominal atmospheric model of Mars is presented, with detailed consideration being given to the various sources of variability in the Martian atmosphere. A basic model for the midlatitude summer is outlined for the northern and southern hemispheres. Attention is given to meteorological variability due to winds, diurnal and seasonal pressure variations, temperature changes, and the effects of dust opacity, particularly on temperature stratification. Viking lander IR thermal mapper data are examined in terms of diurnal and latitudinal temperature variations, and cloud and haze formation and locations are discussed. Mass spectrometry of the atmosphere is used to describe the molecular abundances, and water vapor measurements are reviewed. Finally, radio occultation, UV airglow, and mass spectrometry of the Martian upper atmosphere are investigated, along with the temperature structure of the upper atmosphere.
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    Venus - Chemical weathering of igneous rocks and buffering of atmospheric composition (1982)
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    Publication Date: 2011-08-18
    Description: Data from the Pioneer Venus radar mapper, combined with measurements of wind velocity and atmospheric composition, suggest that surface erosion on Venus varies with altitude. Calcium- and magnesium-rich weathering products are produced at high altitudes by gas-solid reactions with igneous minerals, then removed into the hotter lowlands by surface winds. These fine-grained weathering products may then rereact with the lower atmosphere and buffer the composition of the observed gases carbon dioxide, water vapor, sulfur dioxide, and hydrogen fluoride in some regions of the surface. This process is a plausible mechanism for the establishment in the lowlands of a calcium-rich mineral assemblage, which had previously been found necessary for the buffering of these species.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 216; Apr. 9
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    The induced magnetosphere of Titan (1982)
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    Publication Date: 2011-08-18
    Description: No evidence was found for an intrinsic magnetic field, nor for the development of a bow shock wave, as the corotating Saturnian magnetoplasma convected past Titan during the Voyager 1 close encounter of November 12, 1980. The observation of a well-developed, induced bipolar magnetic tail is evidence, however, of a strong electrodynamic interaction. Three thin, current-carrying regions were crossed which correspond to the inbound and outbound tail magnetopause and an imbedded tail neutral sheet. The interaction is unique among those observed to date in the solar system, in that it is intermediate with respect to sonic and Alfvenic Mach numbers by comparison with Titan in the solar wind and Io in the Jovian magnetosphere. The draping of the Saturnian magnetic field around the ionosphere of Titan is suggested by results of the analysis of magnetic field data.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 87; Mar. 1
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  • 68
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    A mixed formulation finite element for linear thin shell analysis (1982)
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    Publication Date: 2011-08-18
    Description: An eight node curved thin shell slement was tested. The element is based on the degenerate solid concept and the mixed formulation with the independent inplane and transverse shear strains. The number of unknown parameters in the assumed strains is chosen to alleviate the spurious constaining or locking effect. It is indicated that for a pinched cylindrical shell with diaphragmed ends and fixed ends the present element shows good performance.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Research Center Res. in Struct. and Solid Mech., 1982; p 219-228
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  • 69
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    Application of a boundary element method to the study of dynamical torsion of beams (1982)
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    Publication Date: 2011-08-18
    Description: During dynamic torsion of beam elements, consideration of nonuniform warping effects involves a more general technical formulation then that of Saint-Venant. Nonclassical torsion constants appear in addition to the well known torsional rigidity. The adaptation of the boundary integral element method to the calculation of these constants for general section shapes is described. The suitability of the formulation is investigated with some examples of thick as well as thin walled cross sections.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Research Center Res. in Struct. and Solid Mech., 1982; p 129-139
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    Application of the reduced basis method to nonlinear transient thermal analysis (1982)
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    Publication Date: 2011-08-18
    Description: An effort to apply the reduced basis method to nonlinear transient thermal analysis is described. The method combines the classical Rayleigh-Ritz and modal superposition techniques with contemporary finite element methods to retain modeling versatility as the degrees of freedom in a problem are reduced. The essence of the method is to use a few thermal modes from eigenvalue analyses as basis vectors to represent the temperature response for a given thermal problem similar to the use of vibration modes to represent displacements in a dynamic response problem. Approximate temperature distributions were obtained using the reduced basis method for a small section of the Shuttle Orbiter lower wing undergoing reentry heating. Good agreement was obtained between the reduced basis method solutions and full system solutions with reductions in the degrees of freedom of up to a factor of four. The good agreement indicates the reduced basis method has the potential for significant reduction in computing effort for thermal analysis; however, considerable work remains to determine techniques for selecting the type and number of basis vectors needed for approximate solutions to more complex transient thermal problems.
    Keywords: STRUCTURAL MECHANICS
    Type: Res. in Struct. and Solid Mech., 1982; p 49-65
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  • 71
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    The Allan Hills icefield and its relationship to meteorite concentration (1982)
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    Publication Date: 2011-08-18
    Description: The Allan Hills icefield is described by as a limited icefield that has large concentrations of meteorites. The meteorites appear to be concentrated on the lower limb of an ice monocline with other finds scattered throughout the field. In an attempt to understand the mechanisms of meteorite concentration, a triangulation chain was established across the icefield. This chain is composed of 20 stations, two of which are on bedrock, and extends westward from the Allan Hills a distance of 15 kilometers. The triangulation chain and its relationship to the meteorite concentrations is shown.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Smithsonian Astrophysical Observatory Catalog of Meteorites from Victoria Land, Antarctica, 1978 - 1980; p 12-18
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    Composition of Jupiter (1982)
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    Publication Date: 2011-08-18
    Description: The chemistry of Jupiter's atmosphere is reviewed. The various molecules that were discovered on Jupiter are summarized. The compounds: methane, ammonia water, ethane, acetylene, carbon monoxide, phosphine, and germane.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Goddard Space Flight Center Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 1; p 363-385
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    Infrared absorption by OH containing compounds (1982)
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    Publication Date: 2011-08-18
    Description: The spectroscopy of the species H2O, H2O2, and HO2 are discussed. Their vibration rotation transitions are emphasized, but the pure rotational transitions in the vibrational ground state of H2O are also considered since they contribute to opacity in the middle infrared region.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 1; p 295-310
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    New theoretical and experimental methods for pressure broadened linewidths and their interpretation (1982)
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    Publication Date: 2011-08-18
    Description: A review of recent progress in the theory of collisional line broadening, particularly the impact of recent advances in collision dynamics calculations is presented. Some new approaches to the interpretation of experimentally measured linewidths and their impact on planetary atmosphere research are discussed. Experimental techniques which may have some advantage in providing pressure broadening data at very low temperatures are also mentioned.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Goddard Space Flight Center Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 1; p 125-148
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    Molecular spectroscopy and planetary exploration from space (1982)
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    Publication Date: 2011-08-18
    Description: Examples of the role which molecular spectroscopy played in the interpretation of the thermal emission spectra of Earth, Mars, and Jupiter are given. Some advantages of molecular spectroscopy from a spacecraft passing close to a planet, or from an orbiter, over ground based techniques are discussed. Specifically the possibility of obtaining spectra over a wide spectral range (1) without the obscuring effect of Earth's atmosphere, (2) at much higher spatial resolution, and (3) from directions and with phase angles inaccessible from Earth.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 1; p 29-47
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    Channel and physical models of the Jovian subnebula (1982)
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    Publication Date: 2011-08-18
    Description: A semiempirical physical model of the Jovian subnebula was developed by analogy with the primitive solar nebula itself. The chemical aspects of this model are developed according to the principles developed in the study of the thermochemistry and gas kinetic behavior of the solar nebula, but with important modifications to take into account the higher pressures and densities in the Jovian subnebula. The bulk compositions and densities of the inner satellites of Jupiter are calculated. It is proposed that Europa differs from Io chiefly in that in has suffered a less severe thermal history. The general features of this model are applicable with minor modification to the systems of Saturn and Uranus.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Planetary Atmospheres Program; p 4-26
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    Line intensities from band and diode laser measurements: Neutrino 4 of CH4 (1982)
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    Publication Date: 2011-08-18
    Description: The experimental data and theoretical work on the 7.7 micron band of methane are reviewed. This band is particularly relevant in studies of the atmospheres of Jupiter, Saturn and the other outer planets. Methane spectra taken from the infrared spectrometer (IRIS) aboard Voyager, and a temperature profile derived by inverting those data, both for hydrogen and methane are presented.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Goddard Space Flight Center Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 2; p 529-542
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    Thermal Structure of Jupiter and Saturn (1982)
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    Publication Date: 2011-08-18
    Description: Temperatures in the sensible regions of the atmospheres of the outer planets are quite cold. The temperature structures for Jupiter, Saturn, Uranus and Neptune, derived from the equilibrium models are presented in preparation. The vertical temperature profiles for Jupiter and Saturn, the molecular spectroscopic data which form the basis for this type of analysis, and the problems involved with these models for molecular absorption and with the recovery technique in general, are discussed. Results for Jupiter and Saturn from the Pioneer and Voyager infrared experiments are also presented.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Goddard Space Flight Center Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 1; p 333-362
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    Spectroscopic measurements of Mars and Venus with heterodyne techniques (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Measurements were made of the exact shape of CO2 absorption lines in Mars and Venus to determine the vertical pressure temperature structure using high resolution heterodyne spectroscopy. Accurate measurements of absolute wind velocities in both the mesosphere and stratosphere of Venus were made from Doppler shifts of narrow CO2 lines, and searches were made for minor molecular species of interest in modeling the stratospheric photochemistry for Mars and Venus.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Goddard Space Flight Center Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 1; p 277-294
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  • 80
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    Transient species on Mars and Venus (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The similarities between the atmospheres of Earth, Venus, and Mars are discussed. The following species are highlighted: NOx, HOx, and COx. The concentrations of the species were examined for all three planets.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Goddard Space Flight Center Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 1; p 243-251
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  • 81
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    Neutral species in the atmosphere of Venus (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: About 97% of the Venusian atmosphere is CO2, with the balance comprised of various trace constituents. Species other than CO2 that are found in Venus' atmosphere or are being sought are discussed. The problems connected with the spectrum of CO2 itself are highlighted.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Goddard Space Flight Center Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 1; p 229-242
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  • 82
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    Gaseous infrared absorption in the lower atmosphere of Venus (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Possibly important sources of infrared opacity in the Venusian atmosphere was identified. It is shown that which is the major atmospheric constituent comprising about 97 percent of the atmosphere, is the dominant infrared opacity source. Not shown is N2 which comprises about 3 percent of the atmosphere. The mixing ratio of water vapor varies considerably with altitude but falls in the range of about 20 to 200 parts per million (ppm). The mixing ratio of SO2 falls in the range of 100-200 ppm. This number is about 5000 times larger than estimates obtained earlier via Earth-based observations. The abundance of some of the other minor constituents is also shown.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Goddard Space Flight Center Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 1; p 255-269
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  • 83
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    The JPL millimeter, submillimeter and microwave line catalog (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The catalog includes molecules of interest in the interstellar medium, in planetary atmospheres and in the Earth's atmosphere. Different units than those on the AFGL tape are used. For citing line frequencies in the microwave region. Either the experimental errors or the propagation of errors from the fit are included on the tape. This gives an estimate of how accurate the frequencies are. The intensity units are defined as follows: the logarithm of the intensity unit is the cross section times the frequency in MHz. This is essentially the same unit as on the AFGL tape, but contains fewer factors of the speed of light. The catalog is available to the scientific community either as a tape or on microfiche (filmed in frequency sorted and molecule sorted format).
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Goddard Space Flight Center Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 1; p 191-196
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  • 84
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    Microwave rotational spectroscopy (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The region of planetary atmospheres upward of 1 millimeter is considered. The applications of this region, how microwave, millimeter, and submillimeter spectra (the so called rotational spectra) can fruitfully interact with infrared spectral measurements are described. Both the rotational bands and vibrational bands of molecules are considered. A typical rotational absorption coefficient for a linear molecule in a low J state with a dipole moment of about one Debye is plotted and evaluated. A vibrational case was chosen similarly: the transition dipole moment used for the vibrational case is typical of CO at the peak of its rotational distribution. Information on high altitude parameters that often cannot be obtained from higher frequency spectra, which can be provided by rotational spectra is discussed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Goddard Space Flight Center Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 1; p 171-190
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  • 85
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    Venus: Halide cloud condensation and volatile element inventories (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Several Venus cloud condensates, including A12C16 as well as halides, oxides and sulfides of arsenic and antimony, are assessed for their thermodynamic and geochemical plausibility. Aluminum chloride can confidently be ruled out, and condensation of arsenic sulfides on the surface will cause arsenic compounds to be too rare to produce the observed clouds. Antimony may conceivably be sufficiently volatile, but the expected molecular form is gaseous SbS, not the chloride. Arsenic and antimony compounds in the atmosphere will be regulated at very low levels by sulfide precipitation, irrespective of the planetary inventory of As and Sb. Thus the arguments for a volatile-deficient origin for Venus based on the depletion of water and mercury (relative to Earth) cannot be tested by a search for atmospheric arsenic or antimony.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Planetary Atmospheres Program; p 27-35
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  • 86
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    Comments on Pluto's atmosphere (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: A pure CH4 atmosphere would rapidly escape from Pluto. For such an atmosphere, even CH4 frosts on Pluto's surface would completely sublimate on a time scale short compared to Pluto's life. Observations of CH4 therefore imply that its atmosphere must also contain another gas in significant quantity.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Goddard Space Flight Center Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 2; p 709-715
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  • 87
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    Spectroscopy of Triton and Pluto: Current status and prospects (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Near-infrared spectrophotometry of Triton and Pluto at low spectral resolution and signal precision reveals methane absorption on both bodies. The absorption on Triton is probably gaseous CH4, while that on Pluto is a combination of gas and ice of CH4. Using present detectors and telescopes, spectra of Triton and Pluto can be obtained which are 5-10 times better than those published, but such data will not be sufficient to distinguish between gaseous and solid methane on these bodies.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Goddard Space Flight Center Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 2; p 699-706
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  • 88
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    Spectra of ammonia (1982)
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    Publication Date: 2011-08-18
    Description: Developments in the spectral analysis of ammonia are highlighted. Experimental techniques of diode laser spectroscopy were reviewed. It is shown that diode lasers give much better spectral resolution than even Fourier transform spectroscopy.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Goddard Space Flight Center Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 2; p 611-634
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  • 89
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    Long-pathlength absorption spectroscopy of CH4 (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Infrared spectra of methane and ammonia are taken. The methane data base accumulated is described. The spectral region from 4,000 to 6,500 cm is covered at moderate resolution (0.15 cm), working at three temperatures (118, 191, and 272K), and with the (pressure - pathlength) product ranging over a factor of a thousand. Methane spectra broadened by hydrogen and helium have also been taken. Normalized spectra are stored on magnetic tapes, at a resolution slightly better than 0.25 cm.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Goddard Space Flight Center Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 2; p 585-595
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  • 90
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    Current Studies of CH4 from 2.5 to 7 microns (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The 3.5 micron region of methane was analyzed. The positions and strengths of approximately 9000 absorption lines in the region from 2400 to 3200 cm were measured. Spectra were obtained at a resolution of 0.1 cm using the Fourier transform spectrometer and at 0.02 cm resolution using the four passed grating spectrometer. The analysis of the 3.5 micron region required the use of spectra of CH4 in other regions, therefore the methane spectrum from 1200 to 4700 cm is indicated. The method used for the compilation of line lists is demonstrated.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Goddard Space Flight Center Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 2; p 503-526
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  • 91
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    A review of acetylene, ethylene and ethane molecular spectroscopy for planetary applications (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Spectroscopic work in acetylene, ethylene and ethane, are of particular interest since the Voyager IRIS observations of Jupiter. Acetylene and ethane but not ethylene were observed in the Jovian spectrum. Two fundamental bands of the observed gases are used to determine the spatial distribution of these hydrocarbons on Jupiter and to illuminate the photochemistry of these species. The 100 to 1000 cm region is discussed and selected examples of current laboratory work are given.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 2; p 473-496
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  • 92
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    Collision induced sharp features in the infrared spectrum of HD (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The collision induced spectra of HD and H2 are studied. Their application to the study of planetary (and planetary satellite) atmospheres is investigated.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA. Goddard Space Flight Center Vibrational-Rotational Spectry. for Planetary Atmospheres, Vol. 2; p 439-447
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  • 93
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    Approximate analysis of postbuckled through-width delaminations (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: (Previously announced in STAR as N81-27202)
    Keywords: STRUCTURAL MECHANICS
    Type: Composites Technology Review; 4; Fall 198
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  • 94
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    Galileo - Mission to Jupiter (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The payloads, mission, and performance characteristics of the Galileo probe, to be launched by a Centaur boost from the Orbiter in 1985, are described. The Galileo is intended to determine the chemical compositions and physical states of the Jovian atmosphere and of the Jovian satellites, and to investigate the structure and dynamics of the Jovian magnetosphere. The orbiting part of the spacecraft will carry a near-IR mapping spectrometer, a photopolarimeter radiometer, a solid state imaging camera, a UV spectrometer, and five fields and particles instruments. A probe will be dropped for parachute descent into the Jovian atmosphere, carrying an atmospheric structure instrument, a neutral mass spectrometer, a He abundance interferometer, a nephelometer, and a radiometer. A retrorocket burn during the encounter with Jupiter will place the Galileo in an orbit calculated to pass close to all the Jovian moons over 12 orbits spanning 20 mos.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astronomy; Feb
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  • 95
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    Prediction of transonic flutter for a supercritical wing by modified strip analysis (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: (Previously cited in issue 12, p. 2022, Accession no. A81-29471)
    Keywords: STRUCTURAL MECHANICS
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  • 96
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    Evaluation and reduction of errors induced by the Guyan transformation (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The Guyan reduction refers to a method used to reduce the number of degrees of freedom in a structural model for dynamic analysis. Experience shows that, if the method is properly employed, then this reduction method does in fact provide a "reasonably" accurate approximation of the dynamic characteristics of the unreduced model. A method that provides an accurate estimate of the error in each mode of the reduced eigenvalue problem and, in addition, gives first order correction terms that greatly improve the accuracy of the eigenvectors and eigenvalues is presented. The method is demonstrated by standard COSMIC NASTRAN DAMP alters to rigid format 3, real normal mode analysis. Comparative computer time of modal extraction versus error analysis is discussed for the VAX-11/780 version of COSMIC NASTRAN.
    Keywords: STRUCTURAL MECHANICS
    Type: 10th NASTRAN User's Colloq.; p 233-248
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  • 97
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    Improving a NASTRAN dynamic model with test data using LINWOOD (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The concept of expressing test modes as a linear combination of analytical modes was applied to the prediction of corrective terms in math model mass and stiffness. Test data for the Space Shuttle quarter scale solid rocket booster were analyzed by this method and significant improvements in frequency and mode shap correlation are noted. The applicability of the method is demonstrated.
    Keywords: STRUCTURAL MECHANICS
    Type: Georgia Univ. 10th NASTRAN User's Colloq.; p 74-86
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  • 98
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    Solution of axisymmetric fluid structure interaction problems with NASTRAN (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The solution of axisymmetric acoustic fluid structure interaction problems, employing the NASTRAN computer program is presented. A previously developed 3-D Cartesian Coordinates pressure element formulation is adapted especially for axisymmetric elements. Analogous to the 3-D Cartesian Coordinate predecessor, the fluid portion of the problem is modeled with finite elements wherein one of the displacement components serves as a dummy variable for the pressure unknowns. Two alternatives for implementation of the analogy are presented: (1) an approximate method by which dummy values of G, and nu are used to approximately invoke the analogy wherein the accuracy of the approximation is made as close as desired to the proper analogy within an arbitrary small parameter epsiton; (2) an exact method whereby the NASTRAN FORTRAN coding is slightly changed to invoke the analogy exactly. Comparison of the finite element solution to the exact solution to the same problem is given.
    Keywords: STRUCTURAL MECHANICS
    Type: Georgia Univ. 10th NASTRAN User's Colloq.; p 87-111
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  • 99
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    Recent developments of NASTRAN pre- amd post-processors: Response spectrum analysis (RESPAN) and interactive graphics (GIFTS) (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Two specific NASTRAN preprocessors and postprocessors are examined. A postprocessor for dynamic analysis and a graphical interactive package for model generation and review of resuls are presented. A computer program that provides response spectrum analysis capability based on data from NASTRAN finite element model is described and the GIFTS system, a graphic processor to augment NASTRAN is introduced.
    Keywords: STRUCTURAL MECHANICS
    Type: 10th NASTRAN User's Colloq.; p 19-44
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  • 100
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    Recent improvements and enhancements to NASTRAN (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Several improvements and enhancements recently made to NASTRAN are described. Some of the more important features are: streamlined rigid formats; improved rigid formats; changes related to plotting; checking of required PARAM bulk data cards; checkpoint/restart capability; unsorted and sorted bulk data deck echo; automatic output of the DMAP source listing; elimination of link switching caused by use of utility modules; paging the NASTRAN output; processing of mixed record data blocks by INPUT2/OUTPUT2 modules; module execute flag included in the OSCAR listing; and use of the multiple XDMAP cards in the DMAP. It is concluded that these changes increase the usefulness of the program.
    Keywords: STRUCTURAL MECHANICS
    Type: Georgia Univ. 10th NASTRAN User's Colloq.; p 12-17
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