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  • Other Sources  (140)
  • BIOTECHNOLOGY  (53)
  • STRUCTURAL MECHANICS  (46)
  • CHEMISTRY  (41)
  • ASTROPHYSICS
  • 1970-1974  (140)
  • 1973  (140)
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  • Other Sources  (140)
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  • 1970-1974  (140)
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  • 11
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    Application of NASA-developed technology to the automatic control of municipal sewage treatment plants (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A search was made of NASA developed technology and commercial technology for process control sensors and instrumentation which would be applicable to the operation of municipal sewage treatment plants. Several notable items were found from which process control concepts were formulated that incorporated these items into systems to automatically operate municipal sewage treatment plants. A preliminary design of the most promising concept was developed into a process control scheme for an activated sludge treatment plant. This design included process control mechanisms for maintaining constant food to sludge mass (F/M) ratio, and for such unit processes as primary sedimentation, sludge wastage, and underflow control from the final clarifier.
    Keywords: BIOTECHNOLOGY
    Type: NASA-CR-132340
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 12
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    Optimization of a corrugated stiffened composite panel under uniaxial compression (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An approach of structural optimization has been used to optimize the weight of a simply supported, corrugated hat stiffened composite panel under uniaxial compression. The approach consists of the employment of nonlinear mathematical programming techniques to reach an optimum solution. Some simplifying assumptions are made in the stress analysis to obtain faster convergence to an optimum solution. With these simplifying assumptions the number of unknown design parameters is reduced to twelve.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-132314
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 13
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    Selected Apollo 17 soils - Mineralogy and geochemistry of opaque and non-opaque phases (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Soil samples 74220 ('orange soil'), 74241 and 75081 were sized, and the compositions of the opaque and silicate phases were determined. The ilmenites, particularly in 74241, contain up to 7.8 wt % MgO and display higher bireflectance than low-Mg ilmenites. They commonly contain exsolution-like chromite and rutile and occasionally are in association with native Fe in an assemblage probably resulting from reduction. The chromian ulvospinels are similar to Apollo 11 spinels in that they contain near-equal amounts of chromite and ulvospinel molecules. No primary chromites were observed. Most native Fe has No and Co contents of less than 1 wt %; some in 74220 contained 5-6% Ni and less than 1% Co in association with schreibersite.
    Keywords: CHEMISTRY
    Type: Earth and Planetary Science Letters; 21; 1, De; Dec. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 14
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    An environmental chamber system for prolonged metabolic studies on small animals (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Measurement of metabolic adaptation to marginally stressful environments requires both precise regulation of a variety of atmospheric factors for extended periods of time and the capacity to employ sensitive parameters in an undisturbed subject. This paper describes a metabolic chamber system which can simultaneously maintain groups of small animals in two completely separate closed environments having different pressures, temperatures and gas compositions for an indefinite period. Oxygen consumption, carbon dioxide production, food and water consumption and animal activity cycles can be continuously monitored and quantified 24 h per day while the animals are in an unrestrained state. Each chamber can be serviced and the animals handled, injected and sacrificed without subjecting them to barometric stress. Several unique electrical and mechanical components allow semi-automated data collection on a continuous basis for indefinite periods of time.
    Keywords: BIOTECHNOLOGY
    Type: Space Life Sciences; 4; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 15
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    An integrated human thermal system and its unsteady-state simulation (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Consideration of an integrated human thermal system consisting of a human thermal system proper and an external thermal device. A mathematical model of the integrated system has been used in a computer simulation, and the simulation results have been verified through comparison with the results of experiments carried out on nine human subjects. The comparison indicates that the model simulates the system reasonably well.
    Keywords: BIOTECHNOLOGY
    Type: International Journal of Biomedical Engineering; 1; 1, 19; 1973
    Format: text
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    NASA TECHNICAL REPORTS
  • 16
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    Convergence of finite difference transient response computations for thin shells. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Numerical studies pertaining to the limits of applicability of the finite difference method in the solution of linear transient shell response problems are performed, and a computational procedure for the use of the method is recommended. It is found that the only inherent limitation of the finite difference method is its inability to reproduce accurately response discontinuities. This is not a serious limitation in view of natural constraints imposed by the extension of Saint Venant's principle to transient response problems. It is also found that the short wavelength limitations of thin shell (Bernoulli-Euler) theory create significant convergence difficulties in computed response to certain types of transverse excitations. These difficulties may be overcome, however, through proper selection of finite difference mesh dimensions and temporal smoothing of the excitation.
    Keywords: STRUCTURAL MECHANICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 17
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    Analytical and experimental investigation of aircraft metal structures reinforced with filamentary composites. Phase 3: Major component development (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Analytical and experimental investigations, performed to establish the feasibility of reinforcing metal aircraft structures with advanced filamentary composites, are reported. Aluminum-boron-epoxy and titanium-boron-epoxy were used in the design and manufacture of three major structural components. The components were representative of subsonic aircraft fuselage and window belt panels and supersonic aircraft compression panels. Both unidirectional and multidirectional reinforcement concepts were employed. Blade penetration, axial compression, and inplane shear tests were conducted. Composite reinforced structural components designed to realistic airframe structural criteria demonstrated the potential for significant weight savings while maintaining strength, stability, and damage containment properties of all metal components designed to meet the same criteria.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-2122 , D6-60136-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 18
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    Prohibited autodetachment in OD- formed by collisions of O- with D2. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: CHEMISTRY
    Type: Journal of Chemical Physics; 58; Feb. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 19
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    Advanced beaded and tubular structural panels. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A review is presented of an NASA program to develop light-weight beaded and tubular structural panels which can be applied where beaded external surfaces are acceptable aerodynamically or where primary structure is protected by heat shields. The design shapes were obtained with an optimization computer code which iterates geometric parameters to satisfy strength, stability and weight constraints. Methods of fabricating these new configurations are discussed. Nondestructive testing produced extensive combined compression, shear and bending test data on local buckling specimens and large panels. The optimized design concepts offer 25 to 40% weight savings compared to conventional stiffened sheet construction.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 73-370 , Structures, Structural Dynamics, and Materials Conference; Mar 20, 1973 - Mar 22, 1973; Williamsburg, VA; US
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    NASA TECHNICAL REPORTS
  • 20
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    Elastic stability of biaxially loaded longitudinally stiffened composite structures. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A linear analysis method is presented for the elastic stability of structures of uniform cross section, that may be idealized as an assemblage of laminated plate-strips, flat and curved, and beams. Each plate-strip and beam covers the entire length of the structure and is simply supported on the edges normal to the longitudinal axis. Arbitrary boundary conditions may be specified on any external longitudinal side of plate-strips. The structure or selected plate-strips may be loaded in any desired combination of inplane biaxial loads. The analysis simultaneously considers all modes of instability and is applicable for the buckling of laminated composite structures. Some numerical results are presented to indicate possible applications.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 73-367 , Structures, Structural Dynamics, and Materials Conference; Mar 20, 1973 - Mar 22, 1973; Williamsburg, VA; US
    Format: text
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    NASA TECHNICAL REPORTS
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