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  • Other Sources  (33)
  • ENERGY PRODUCTION AND CONVERSION  (13)
  • Astrodynamics  (10)
  • COMPUTER PROGRAMMING AND SOFTWARE  (10)
  • 1
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    A review of test results on solar thermal power modules with dish-mounted Stirling and Brayton cycle engines (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: This paper presents results of development tests of various solar thermal parabolic dish modules and assemblies that used dish-mounted Brayton or Stirling cycle engines for production of electric power. These tests indicate that early modules achieve net efficiencies up to 29 percent in converting sunlight to electricity, as delivered to the grid. Various equipment deficiencies were observed and a number of malfunctions occurred. The performance measurements, as well as the malfunctions and other test experience, provided information that should be of value in developing systems with improved performance and reduced maintenance.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: ASME, Transactions, Journal of Solar Energy Engineering (ISSN 0199-6231); 110; 268-274
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    NASA TECHNICAL REPORTS
  • 2
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    A review of test results on parabolic dish solar thermal power modules with dish-mounted Rankine engines and for production of process steam (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: This paper presents results of development testing of various solar thermal parabolic dish modules and assemblies. Most of the tests were at modules and assemblies that used a dish-mounted, organic Rankine cycle turbine for production of electric power. Some tests were also run on equipment for production of process steam or for production of electricity using dish-mounted reciprocating steam engines. These tests indicate that early modules achieve efficiencies of about 18 percent in converting sunlight to electricity (excluding the inverter but including parasitics). A number of malfunctions occurred. The performance measurements, as well as the malfunctions and other operating experience, provided information that should be of value in developing systems with improved performance and reduced maintenance.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: ASME, Transactions, Journal of Solar Energy Engineering (ISSN 0199-6231); 110; 275-281
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    NASA TECHNICAL REPORTS
  • 3
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    Development of the NASA/FLAGRO computer program (1988)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A preliminary version of a new computer program has been developed for calculating crack propagation in cyclically loaded structures. The new program, titled NASA/FLAGRO, has numerous enhanced features over previous programs used for safe life analysis on space systems. The essential features of the new program consist of modular design, promptive input using a cathode ray tube terminal, improved crack growth rate analytical methods, many new crack case solutions, and incorporation of user-defined files for material properties and fatigue spectrums. Also, five options made available in the program are to compute: (1) safe life of a part with a preexisting crack; (2) critical crack size for a specified stress level; (3) stress-intensity factor numerical values for making comparisons or checks of solutions; (4) least-squares fit of growth rate equations to crack growth rate data; and (5) the conversion of a versus N data to Delta K versus da/dN.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
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    NASA TECHNICAL REPORTS
  • 4
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    Test results on parabolic dish concentrators for solar thermal power systems (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: This paper presents results of development testing of various solar thermal parabolic dish concentrators. The concentrators were mostly designed for the production of electric power using dish-mounted Rankine, Brayton or Stirling cycle engines, intended to be produced at low cost. Measured performance for various dishes included optical efficiencies ranging from 0.32 to 0.86 at a geometric concentration ratio of 500, and from about 0.09 to 0.85 at a geometric concentration ratio of 3000. Some malfunctions were observed. The tests should provide operating information of value in developing concentrators with improved performance and reduced maintenance.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Solar Energy (ISSN 0038-092X); 42; 2, 19; 173-187
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  • 5
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    Implementation of a frame-based representation in CLIPS (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Knowledge representation is one of the major concerns in expert systems. The representation of domain-specific knowledge should agree with the nature of the domain entities and their use in the real world. For example, architectural applications deal with objects and entities such as spaces, walls, and windows. A natural way of representing these architectural entities is provided by frames. This research explores the potential of using the expert system shell CLIPS, developed by NASA, to implement a frame-based representation that can accommodate architectural knowledge. These frames are similar but quite different from the 'template' construct in version 4.3 of CLIPS. Templates support only the grouping of related information and the assignment of default values to template fields. In addition to these features frames provide other capabilities including definition of classes, inheritance between classes and subclasses, relation of objects of different classes with 'has-a', association of methods (demons) of different types (standard and user-defined) to fields (slots), and creation of new fields at run-time. This frame-based representation is implemented completely in CLIPS. No change to the source code is necessary.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA. Johnson Space Center, First CLIPS Conference Proceedings, Volume 2; p 570-580
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    NASA TECHNICAL REPORTS
  • 6
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    Implementing a frame representation in CLIPS/COOL (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: An implementation is described and evaluated of frames in COOL. The test case is a frame based semantic network previously implemented in CLIPS (C Language Integrated Production System) Version 4.3 as part of the Intelligent Computer Aided Design System (ICADS) and reported at the first CLIPS conference.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA. Johnson Space Center, Second CLIPS Conference Proceedings, Volume 2; p 497-504
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  • 7
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    ICADS: A cooperative decision making model with CLIPS experts (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A cooperative decision making model is described which is comprised of six concurrently executing domain experts coordinated by a blackboard control expert. The focus application field is architectural design, and the domain experts represent consultants in the area of daylighting, noise control, structural support, cost estimating, space planning, and climate responsiveness. Both the domain experts and the blackboard were implemented as production systems, using an enhanced version of the basic CLIPS package. Acting in unison as an Expert Design Advisor, the domain and control experts react to the evolving design solution progressively developed by the user in a 2-D CAD drawing environment. A Geometry Interpreter maps each drawing action taken by the user to real world objects, such as spaces, walls, windows, and doors. These objects, endowed with geometric and nongeometric attributes, are stored as frames in a semantic network. Object descriptions are derived partly from the geometry of the drawing environment and partly from knowledge bases containing prototypical, generalized information about the building type and site conditions under consideration.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA. Johnson Space Center, Second CLIPS Conference Proceedings, Volume 1; p 102-111
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  • 8
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    Using PVM to host CLIPS in distributed environments (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: It is relatively easy to enhance CLIPS (C Language Integrated Production System) to support multiple expert systems running in a distributed environment with heterogeneous machines. The task is minimized by using the PVM (Parallel Virtual Machine) code from Oak Ridge Labs to provide the distributed utility. PVM is a library of C and FORTRAN subprograms that supports distributive computing on many different UNIX platforms. A PVM deamon is easily installed on each CPU that enters the virtual machine environment. Any user with rsh or rexec access to a machine can use the one PVM deamon to obtain a generous set of distributed facilities. The ready availability of both CLIPS and PVM makes the combination of software particularly attractive for budget conscious experimentation of heterogeneous distributive computing with multiple CLIPS executables. This paper presents a design that is sufficient to provide essential message passing functions in CLIPS and enable the full range of PVM facilities.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA. Johnson Space Center, Third CLIPS Conference Proceedings, Volume 2; p 203-211
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    NASA TECHNICAL REPORTS
  • 9
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    BMDO photovoltaics program overview (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: This is an overview of the Ballistic Missile Defense Organization (BMDO) Photovoltaic Program. Areas discussed are: (1) BMDO advanced Solar Array program; (2) Brilliant Eyes type satellites; (3) Electric propulsion; (4) Contractor Solar arrays; (5) Iofee Concentrator and Cell development; (6) Entech linear mini-dome concentrator; and (7) Flight test update/plans.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Lewis Research Center, Proceedings of the 13th Space Photovoltaic Research and Technology Conference (SPRAT 13); p 13-21
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  • 10
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    Converting environmental wastes into valuable resources (1993)
    In:  CASI
    Details
    Publication Date: 2014-08-29
    Description: This concept employs a viable energy saving method that uses a solvent to separate oil from particle matter; it can be used in metal forming industries to deoil sludges, oxides, and particle matter that is presently committed to landfill. If oily particles are used in their oily state, severe consequences to environmental control systems such as explosions or filter blinding, occur in the air handling equipment. This is due to the presence of hydrocarbons in the stack gasses resulting from the oily particles. After deoiling, the particles can be recycled and the separated oil can be used as a fuel. The process does not produce a waste of it's own and does not harm air or water. It demonstrates the dual benefits of it being commercially viable and in the national interest of conserving resources.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA, Washington, Technology 2002: The Third National Technology Transfer Conference and Exposition, Volume 1; p 118-120
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