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  • SOLAR PHYSICS  (52)
  • STRUCTURAL MECHANICS  (41)
  • Biology
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  • General Chemistry
  • 1975-1979  (111)
  • 1955-1959  (11)
  • 1978  (111)
  • 1958  (11)
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  • 1975-1979  (111)
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  • 1
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    High heat flux actively cooled honeycomb sandwich structural panel for a hypersonic aircraft (1978)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The results of a program to design and fabricate an unshielded actively cooled structural panel for a hypersonic aircraft are presented. The design is an all-aluminum honeycomb sandwich with embedded cooling passages soldered to the inside of the outer moldline skin. The overall finding is that an actively cooled structure appears feasible for application on a hypersonic aircraft, but the fabrication process is complex and some material and manufacturing technology developments are required. Results from the program are summarized and supporting details are presented.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-CR-2959
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Tests of beaded and tubular structural panels (1978)
    In:  CASI
    Details
    Publikationsdatum: 2006-06-12
    Beschreibung: Two efficient concepts built from curved elements were identified, and a data base for tubular panels was developed. The tubular panel failure modes were understood, and the data base for these panels indicated that their performance can be predicted. The concepts are currently being tested in a realistic builtup structure; 157 room temperature tests and 67 hot tests were made with no structural failures, although all of these tests were not at the design load of the structure.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: Recent Advan. in Structures for Hypersonic Flight, Pt. 2; p 538-576
    Format: text
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  • 3
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    Hypersonic structures: An aerodynamicist's perspective, or one man's dream is another man's nightmare (1978)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The relationship between hypersonic aerodynamic and structural design is reviewed. The evolution of the hypersonic vehicle design is presented. Propulsion systems, structural materials, and fuels are emphasized.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: Recent Advan. in Structures for Hypersonic Flight, Pt. 1; p 5-38
    Format: application/pdf
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  • 4
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    Design and fabrication of a radiative actively cooled honeycomb sandwich structural panel for a hypersonic aircraft (1978)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The panel assembly consisted of an external thermal protection system (metallic heat shields and insulation blankets) and an aluminum honeycomb structure. The structure was cooled to temperature 442K (300 F) by circulating a 60/40 mass solution of ethylene glycol and water through dee shaped coolant tubes nested in the honeycomb and adhesively bonded to the outer skin. Rene'41 heat shields were designed to sustain 5000 cycles of a uniform pressure of + or - 6.89kPa (+ or - 1.0 psi) and aerodynamic heating conditions equivalent to 136 kW sq m (12 Btu sq ft sec) to a 422K (300 F) surface temperature. High temperature flexible insulation blankets were encased in stainless steel foil to protect them from moisture and other potential contaminates. The aluminum actively cooled honeycomb sandwich structural panel was designed to sustain 5000 cycles of cyclic in-plane loading of + or - 210 kN/m (+ or - 1200 lbf/in.) combined with a uniform panel pressure of + or - 6.89 kPa (?1.0 psi).
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: NASA-CR-2957
    Format: application/pdf
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  • 5
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    Derivation of the equations of motion for complex structures by symbolic manipulation (1978)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: This paper outlines a computer program especially tailored to the task of deriving explicit equations of motion for structures with point-connected substructures. The special purpose program is written in FORTRAN and is designed for performing the specific algebraic operations encountered in the derivation of explicit equations of motion. The derivation is by the Lagrangian approach. Using an orderly kinematical procedure and a discretization and/or truncation scheme, it is possible to write the kinetic and potential energy of each substructure in a compact vector-matrix form. Then, if each element of the matrices and vectors encountered in the kinetic and potential energy is a known algebraic expression, the computer program performs the necessary operations to evaluate the kinetic and potential energy of the system explicitly. Lagrange's equations for small motions about equilibrium can be deduced directly from the explicit form of the system kinetic and potential energy.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: Computers and Structures; 9; Dec. 197
    Format: text
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  • 6
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    The strength of the sun's polar fields (1978)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The magnetic field strength within the polar caps of the sun is an important parameter for both the solar activity cycle and for our understanding of the interplanetary magnetic field. Measurements of the line-of-sight component of the magnetic field generally yield 0.1 to 0.2 mT near times of sunspot minimum. This paper reports measurements of the polar fields made at the Stanford Solar Observatory using the Fe I line at 525.02 nm. It is found that the average flux density poleward of 55 deg latitude is about 0.6 mT peaking to more than 1 mT at the pole and decreasing to 0.2 mT at the polar cap boundary. The total open flux through either polar cap thus becomes about 3 x 10 to the 14th Wb. It is also shown that observed magnetic field strengths vary as the line-of-sight component of nearly radial fields.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: Solar Physics; 58; July 197
    Format: text
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  • 7
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    The ATLAS integrated structural analysis and design software system (1978)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The ATLAS system provides an extensive set of integrated technical computer-program modules for the analysis and design of general structural configurations, as well as capabilities that are particularly suited for the aeroelastic design of flight vehicles. The system is based on the stiffness formulation of the finite element structural analysis method and can be executed in batch and interactive computing environments on CDC 6600/CYBER computers. Problem-definition input data are written in an engineering-oriented language using a free field format. Input-data default values, generation options, and data quality checks provided by the preprocessors minimize the amount of data and flowtime for problem definition/verfication. Postprocessors allow selected input and calculated data to be extracted, manipulated, and displayed via on-line and off-line prints or plots for monitoring and verifying problem solutions. The sequence and mode of execution of selected program modules are controlled by a common user-oriented language.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: Res. in Computerized Structural Analysis and Syn.,; p 1-14
    Format: application/pdf
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  • 8
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    Center and limb solar spectrum in high spectral resolution 225.2 nm to 319.6 nm (1978)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The atlas has been designed to fulfill the need in solar and stellar astronomy, in aeronomy, and in space science for a convenient reference source that provides a detailed and accurate record of the measured solar ultraviolet spectrum in high spectral resolution for the wavelength range from 225.2 nm to 319.6 nm. The atlas also contains a preliminary synthetic solar spectrum with a legend for identifying and describing the features of the synthetic spectrum. Attention is given to aspects of instrumentation, the radiometric calibration, the wavelength scale, background noise random fluctuations and data filtering, intermittent noise, the observational conditions, the experimental uncertainty, the atlas format, references, tables, and plots.
    Schlagwort(e): SOLAR PHYSICS
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
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    Physical properties of solar chromospheric plages. III - Models based on Ca II and Mg II observations (1978)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Solar plages are modeled using observations of both the Ca II K and the Mg II h and k lines. A partial-redistribution approach is employed for calculating the line profiles on the basis of a grid of five model chromospheres. The computed integrated emission intensities for the five atmospheric models are compared with observations of six regions on the sun as well as with models of active-chromosphere stars. It is concluded that the basic plage model grid proposed by Shine and Linsky (1974) is still valid when the Mg II lines are included in the analysis and the Ca II and Mg II lines are analyzed using partial-redistribution diagnostics.
    Schlagwort(e): SOLAR PHYSICS
    Materialart: PB-289015 , Solar Physics; 58; June 197
    Format: text
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  • 10
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    The solar XUV He I and He II emission lines. II - Intensity ratios and distribution functions (1978)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Schlagwort(e): SOLAR PHYSICS
    Materialart: PB-284726 , Astrophysical Journal; vol. 222
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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