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  • 1
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    Lessons learned from an Ada conversion project (1988)
    In:  CASI
    Details
    Publication Date: 2004-12-04
    Description: Recognizing the importance of building software with the robustness to accommodate rapid advances in technology, developers have focused on methods which preserve both past and future investment in software and in providing an advanced software engineering environment that frees the engineer, to the greatest extent possible, from the more routine aspects of software design and development. The software engineer is permitted to concentrate on the creative aspects of problem resolution. Standard languages such as Ada maximize portability across hardware and operating systems. Standard interfaces which enhance portability and permit the incorporation of new technology as it becomes available have been developed. Software design and development techniques which maximize portability receive increasing emphasis. Experience gained in porting an Ada application between two widely varying environments is evaluated in light of current practices to maximize software portability.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Research Inst. for Computing and Information Systems, RICIS 1988 Symposium; p 73-83
    Format: text
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  • 2
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    New technology implementation: Technical, economic and political factors (1985)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: An analysis is presented of the process of implementing advanced manufacturing technology, based on studies of numerous organizations. This process is seen as consisting of a series of decisions with technical, economic, and political objectives. Frequency decisions involve specifications, equipment, resources/organization, and location. Problems in implementation are viewed as resulting from tradeoffs among the objectives, the tendency of decision makers to emphasize some objectives at the expense of others, and the propensity of problems to spread from one area to another. Three sets of recommendations, based on this analysis, are presented.
    Keywords: ADMINISTRATION AND MANAGEMENT
    Type: NASA. Johnson (Lyndon B.) Space Center R and D Productivity: New Challenges for the US Space Program; p 165-175
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    NASA TECHNICAL REPORTS
  • 3
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    Microflares in the solar magnetic network (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Localized brightenings are found throughout the magnetic network in quiet sun image sequences obtained in the C IV 1548 A line by the SMM satellite's UV spectrometer and polarimeter. Some bright sites are short-lived, while others persist. Plots of the intensity fluctuations show that the enhancements at both short- and long-lived sites are the result of localized impulsive heating events that occur intermittently at the short-lived sites and in more rapid succession at the long-lived ones. The number of these events and their visibility in the wings of the C IV line are consistent with their identification as the explosive events seen in UV spectra.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 323; 380-390
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Application of Gr/PMR-15 to commercial aircraft (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Following from early experience with polyimides on the SST program and Shuttle aft flap studies the Boeing Company is now working on collaborative programs with its principal nacelle suppliers to pursue the development of Gr/PMR-15 nacelle components. Two programs are currently in effect. The first program is directed specifically towards the flight test and service evaluation at the earliest possible date of a 747 nacelle core cowl structure. The second program seeks to firmly establish the producibility and cost of a 757 thrust reverser C duct in a production environment. The near term objectives of these programs include: (1) the comparison of estimated cost and weight of Gr/PMR-15 versus metal structure, (2) the engine test of representative composite structure, (3) the preliminary design and analysis of the C duct structure, and (4) the preparation of cost data and time schedules for the development and producibility program. In addition to powerplant structure, the propulsion ducting system has shown to be a strong candidate for Gr/PMR-15 application. Currently, the Boeing 747 Organization is evaluating the use of PMR-15 matrix composites to replace nearly 800 lbs of titanium ducting per airplane.
    Keywords: COMPOSITE MATERIALS
    Type: NASA. Lewis Research Center High Temp. Polymer Matrix Composites; p 393-400
    Format: application/pdf
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  • 5
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    A rotating electrical transfer device (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The design, development, and performance characteristics of two roll ring configurations - a roll ring being a device used in transferring electrical energy across a continuously rotating or oscillating interface through one or more flexible rolling contacts, or flexures are described. Emphasis is placed on the design problems and solutions encountered during development in the areas of flexure fatigue, contact electroplating, electrical noise, and control of interface geometry. Also, the present status of each configuration is summarized.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Ames Research Center 19th Aerospace Mech. Symp.; p 277-291
    Format: application/pdf
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  • 6
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    Shuttle S-band communications technical concepts (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Using the S-band communications system, shuttle orbiter can communicate directly with the Earth via the Ground Spaceflight Tracking and Data Network (GSTDN) or via the Tracking and Data Relay Satellite System (TDRSS). The S-band frequencies provide the primary links for direct Earth and TDRSS communications during all launch and entry/landing phases of shuttle missions. On orbit, S-band links are used when TDRSS Ku-band is not available, when conditions require orbiter attitudes unfavorable to Ku-band communications, or when the payload bay doors are closed. the S-band communications functional requirements, the orbiter hardware configuration, and the NASA S-band communications network are described. The requirements and implementation concepts which resulted in techniques for shuttle S-band hardware development discussed include: (1) digital voice delta modulation; (2) convolutional coding/Viterbi decoding; (3) critical modulation index for phase modulation using a Costas loop (phase-shift keying) receiver; (4) optimum digital data modulation parameters for continuous-wave frequency modulation; (5) intermodulation effects of subcarrier ranging and time-division multiplexing data channels; (6) radiofrequency coverage; and (7) despreading techniques under poor signal-to-noise conditions. Channel performance is reviewed.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Space Shuttle Tech. Conf., Pt. 2; p 720-756
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Lessons learned from an Ada conversion project (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Background; SAVVAS architecture; software portability; history of Ada; isolation of non-portable code; simple terminal interface package; constraints of language features; and virtual interfaces are outlined. This presentation is represented by viewgraphs only.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Houston Univ., RICIS 1988 Symposium Proceedings. Presentation appendix; 13 p
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  • 8
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    AVIRIS performance during the 1987 flight season: An AVIRIS project assessment and summary of the NASA-sponsored performance evaluation (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Results are presented of the assessment of AVIRIS performance during the 1987 flight season by the AVIRIS project and the earth scientists who were chartered by NASA to conduct an independent data quality and sensor performance evaluation. The AVIRIS evaluation program began in late June 1987 with the sensor meeting most of its design requirements except for signal-to-noise ratio in the fourth spectrometer, which was about half of the required level. Several events related to parts failures and design flaws further reduced sensor performance over the flight season. Substantial agreement was found between the assessments by the project and the independent investigators of the effects of these various factors. A summary of the engineering work that is being done to raise AVIRIS performance to its required level is given. In spite of degrading data quality over the flight season, several exciting scientific results were obtained from the data. These include the mapping of the spatial variation of atmospheric precipitable water, detection of environmentally-induced shifts in the spectral red edge of stressed vegetation, detection of spectral features related to pigment, leaf water and ligno-cellulose absorptions in plants, and the identification of many diagnostic mineral absorption features in a variety of geological settings.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Proceedings of the Airborne Visible/Infrared Imaging Spectromet; Proceedings of the A
    Format: application/pdf
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  • 9
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    RenderMan design principles (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The two worlds of interactive graphics and realistic graphics have remained separate. Fast graphics hardware runs simple algorithms and generates simple looking images. Photorealistic image synthesis software runs slowly on large expensive computers. The time has come for these two branches of computer graphics to merge. The speed and expense of graphics hardware is no longer the barrier to the wide acceptance of photorealism. There is every reason to believe that high quality image synthesis will become a standard capability of every graphics machine, from superworkstation to personal computer. The significant barrier has been the lack of a common language, an agreed-upon set of terms and conditions, for 3-D modeling systems to talk to 3-D rendering systems for computing an accurate rendition of that scene. Pixar has introduced RenderMan to serve as that common language. RenderMan, specifically the extensibility it offers in shading calculations, is discussed.
    Keywords: COMPUTER OPERATIONS AND HARDWARE
    Type: NASA, Lyndon B. Johnson Space Center, Graphics Technology in Space Applications (GTSA 1989); p 9-11
    Format: application/pdf
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  • 10
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    Development of a rotary fluid transfer coupling and support mechanism for space station (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A design was developed for a rotary fluid coupling to transfer coolant fluids (primarily anhydrous ammonia) across rotating joints of the space station. Development testing using three conceptual designs yielded data which were used to establish the design of a multipass fluid coupling capable of handling three fluid circuits. In addition, a mechanism to support the fluid coupling and allow an astronaut to replace the coupling quickly and easily was designed.
    Keywords: MECHANICAL ENGINEERING
    Type: The 22nd Aerospace Mechanisms Symposium; p 355-371
    Format: application/pdf
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