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  • 1
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    Space Technology Experiment Platform (STEP). A Shuttle-borne support facility for structures, structural dynamics, and control technology flight experiments (1983)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The Space Transportation System (STS) is used for technology experiments in space. The Space Technology Experiment Platform (STEP) is a Shuttle-borne experiment support facility for use by structures, structural dynamics, and controls technology flight experiments. STEP represents a key element in the commitment to STS utilization. The STEP concept and definition process is discussed, and the results obtained to date on the configuration and function capability are summarized, and preliminary schedule information is presented.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: Large Space Antenna Systems Technol., Pt. 2; p 969-980
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Space Technology Experiments Platform (STEP) overview (1984)
    In:  CASI
    Details
    Publication Date: 2006-04-03
    Description: The Space Technology Experiments Platform (STEP) concept is summarized. It is shown that STEP is the enabling link between the research community and the space environment made accessible by the Space Transportation System (STS). The constituent elements of the research community are identified, the pertinent space environment attributes are listed, and the major guidelines applicable to establishing the specific STEP configuration are identified.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: STEP Expt. Requirements; p 1-12
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    NASA TECHNICAL REPORTS
  • 3
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    Purification of biomaterials by phase partitioning (1984)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: A technique which is particularly suited to microgravity environments and which is potentially more powerful than electrophoresis is phase partitioning. Phase partitioning is purification by partitioning between the two immiscible aqueous layers formed by solution of the polymers poly(ethylene glycol) and dextran in water. This technique proved to be very useful for separations in one-g but is limited for cells because the cells are more dense than the phase solutions thus tend to sediment to the bottom of the container before reaching equilibrium with the preferred phase. There are three phases to work in this area: synthesis of new polymers for affinity phase partitioning; development of automated apparatus for ground-based separations; and design of apparatus for performing simple phase partitioning space experiments, including examination of mechanisms for separating phases in the absence of gravity.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA. Marshall Space Flight Center 2nd Symp. on Space Industrialization; p 304
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    NASA TECHNICAL REPORTS
  • 4
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    Separation of aqueous two-phase polymer systems in microgravity (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Phase separation of polymer systems in microgravity is studied in aircraft flights to prepare shuttle experiments. Short duration (20 sec) experiments demonstrate that phase separation proceeds rapidly in low gravity despite appreciable phase viscosities and low liquid interfacial tensions (i.e., 50 cP, 10 micro N/m). Ostwald ripening does not appear to be a satisfactory model for the phase separation mechanism. Polymer coated surfaces are evaluated as a means to localize phases separated in low gravity. Contact angle measurements demonstrate that covalently coupling dextran or PEG to glass drastically alters the 1-g wall wetting behavior of the phases in dextran-PEG two phase systems.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: ESA Fifth European Symp. on Mater. Sci. under Microgravity. Results of Spacelab 1; p 309-312
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    NASA TECHNICAL REPORTS
  • 5
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    Phase 2 and 3 wind tunnel tests of the J-97 powered, external augmentor V/STOL model (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Static and forward speed tests were made in a 40 multiplied by 80 foot wind tunnel of a large-scale, ejector-powered V/STOL aircraft model. Modifications were made to the model following earlier tests primarily to improve longitudinal acceleration capability during transition from hovering to wingborne flight. A rearward deflection of the fuselage augmentor thrust vector was shown to be beneficial in this regard. Other augmentor modifications were tested, notably the removal of both endplates, which improved acceleration performance at the higher transition speeds. The model tests again demonstrated minimal interference of the fuselage augmentor on aerodynamic lift. A flapped canard surface also showed negligible influence on the performance of the wing and of the fuselage augmentor.
    Keywords: AERODYNAMICS
    Type: NASA-CR-163578 , DHC-DND-80-1
    Format: application/pdf
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  • 6
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    Boundary-Layer Equations for Two-Dimensional and Axisymmettric Flow (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In program coupled, iterative implicit finite-difference procedure solves system of equations for laminar transitional or turbulent boundary-layer flows. Program written in FORTRAN IV.
    Keywords: MECHANICS
    Type: LAR-13015 , NASA Tech Briefs (ISSN 0145-319X); 7; 3; P. 317
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  • 7
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    Rationale for two phase polymer system microgravity separation experiments (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The two-phase systems that result when aqueous solutions of dextran and poly(ethylene glycol) are mixed at concentrations above a few percent are discussed. They provide useful media for the partition and isolation of macromolecules and cell subpopulations. By manipulating their composition, separations based on a variety of molecular and surface properties are achieved, including membrane hydrophobic properties, cell surface charge, and membrane antigenicity. Work on the mechanism of cell partition shows there is a randomizing, nonthermal energy present which reduces separation resolution. This stochastic energy is probably associated with hydrodynamic interactions present during separation. Because such factors should be markedly reduced in microgravity, a series of shuttle experiments to indicate approaches to increasing the resolution of the procedure are planned.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: ESA Fifth European Symp. on Mater. Sci. under Microgravity. Results of Spacelab 1; p 315-318
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    NASA TECHNICAL REPORTS
  • 8
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    Experiences with explicit finite-difference schemes for complex fluid dynamics problems on STAR-100 and CYBER-203 computers (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Several two- and three-dimensional external and internal flow problems solved on the STAR-100 and CYBER-203 vector processing computers are described. The flow field was described by the full Navier-Stokes equations which were then solved by explicit finite-difference algorithms. Problem results and computer system requirements are presented. Program organization and data base structure for three-dimensional computer codes which will eliminate or improve on page faulting, are discussed. Storage requirements for three-dimensional codes are reduced by calculating transformation metric data in each step. As a result, in-core grid points were increased in number by 50% to 150,000, with a 10% execution time increase. An assessment of current and future machine requirements shows that even on the CYBER-205 computer only a few problems can be solved realistically. Estimates reveal that the present situation is more storage limited than compute rate limited, but advancements in both storage and speed are essential to realistically calculate three-dimensional flow.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: CYBER-205 Applications Symposium; Aug. 12, 13, 1982; Fort Collins, CO
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  • 9
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    STS-1 unique redundant computer set logic flow diagrams (sequencing) (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Keywords: SPACE TRANSPORTATION
    Type: NASA-CR-164510 , JSC-16288-REV-B , LEMSCO-14086-REV-B
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Solar pond power plant feasibility study for Davis, California (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The feasibility of constructing a solar pond power plant at Davis, California was studied. Site visits, weather data compilation, soil and water analyses, conceptual system design and analyses, a material and equipment market survey, conceptual site layout, and a preliminary cost estimate were studied. It was concluded that a solar pond power plant is technically feasible, but economically unattractive. The relatively small scale of the proposed plant and the high cost of importing salt resulted in a disproportionately high capital investment with respect to the annual energy production capacity of the plant. Cycle optimization and increased plant size would increase the economical attractiveness of the proposed concept.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-168819 , JPL-PUB-82-16 , JPL-5107-4 , NAS 1.26:168819
    Format: application/pdf
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