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  • ASTRONAUTICS (GENERAL)  (7)
  • 47H17  (2)
  • 65G10  (1)
  • 65H10  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Computing 26 (1981), S. 45-56 
    ISSN: 1436-5057
    Keywords: Order-convex operator ; Banach space ; Existence ; Convergence ; Operator equation ; partially ordered topological linear space ; 65J15 ; 47H17 ; 47H07
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung SeiF:X→Y ein ordnungskonvexer Operator, woX, Y halbgeordnete Banachräume sind. Es werden zwei verwandte Verfahren zur Lösung der GleichungF(x)=0 diskutiert, von denen eines schon von Pasquali beschrieben worden ist (s. [2]), das andere von Wolfe [12]. Existenz- und Konvergenzsätze für diese Verfahren sind dargestellt und mit Hilfe von Beispielen illustriert. Ferner liegen einige Bemerkungen über ein Verfahren von Traub vor, das auch schon von Wolfe diskutiert worden ist [12].
    Notes: Abstract LetF:X→Y be an order-convex operator, whereX, Y are partially ordered Banach spaces. Two related methods for the solution ofF(x)=0 are discussed, one of which has been studied by Pasquali (see [2]) and the other by Wolfe [12]. Existence-convergence theorems for the methods are given, and these are illustrated with the aid of example. Some remarks are also made on a method due to Traub [7] which has also been discussed by Wolfe [12].
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Computing 50 (1993), S. 353-368 
    ISSN: 1436-5057
    Keywords: 65G10 ; 65H10 ; 65R20 ; Interval arithmetic ; existence ; uniqueness ; convergence ; componentwise error bounds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Existenz- und Eindeutigkeitstests von Pandian werden verallgemeinert und in Zusammenhang gebracht mit Ergebnissen von Moore und Kioustelidis sowie von Shen und Neumaire.
    Notes: Abstract Improved forms of the existence and uniqueness tests due to Pandian are given and are related to results due to Moore and Kioustelidis and to Shen and Neumaier.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Computing 35 (1985), S. 63-72 
    ISSN: 1436-5057
    Keywords: 65J15 ; 47H17 ; 47H07 ; Nonlinear algebraic equations ; Convergence ; Interval arithmetic ; Symmetric single-step method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Es werden einige reelle und intervallmäßige Algorithmen zur numerischen Lösung einer Klasse von nichtlinearen algebraischen Gleichungen beschrieben. Diese Algorithmen basieren auf dem symmetrischen Einzelschrittverfahren [2] und auf Newton-Verfahren nach [10], [11], [8]. Konvergenzsätze und numerische Ergebnisse werden angegeben, die die Effektivität der Algorithmen illustrieren.
    Notes: Abstract Some real and interval algorithms for the numerical solution of a class of nonlinear algebraic equations are described. These algorithms are based upon the symmetric single-step [2] and Newton [10], [11], [8] methods. Convergence theorems and numerical results which illustrate the effectiveness of the algorithms are given.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2019-06-27
    Description: The following areas were discussed in relation to a study of the commonality of space vehicle applications to future national needs: (1) index of initiatives (civilian observation, communication, support), brief illustrated description of each initiative, time periods (from 1980 to 2000+) for implementation of these initiatives; (2) data bank of functional system options, presented in the form of data sheets, one for each of the major functions, with the system option for near-term, midterm, and far-term space projects applicable to each subcategory of functions to be fulfilled; (3) table relating initiatives and desired goals (public service and humanistic, materialistic, scientific and intellectual); and (4) data on size, weight and cost estimations.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-CR-148710 , ATR-76(7365)-1-VOL-3-PT-1
    Format: application/pdf
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  • 5
    Publication Date: 2019-06-27
    Description: The methodology of alternate world future scenarios is utilized for selecting a plausible, though not advocated, set of future scenarios each of which results in a program plan appropriate for the respective environment. Each such program plan gives rise to different building block and technology requirements, which are analyzed for common need between the NASA and the DoD for each of the alternate world scenarios. An essentially invariant set of system, building block, and technology development plans is presented at the conclusion, intended to allow protection of most of the options for system concepts regardless of what the actual future world environment turns out to be. Thus, building block and technology needs are derived which support: (1) each specific world scenario; (2) all the world scenarios identified in this study; or (3) generalized scenarios applicable to almost any future environment. The output included in this volume consists of the building blocks, i.e.: transportation vehicles, orbital support vehicles, and orbital support facilities; the technology required to support the program plans; identification of their features which could support the DoD and NASA in common; and a complete discussion of the planning methodology.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-CR-148708 , ATR-76(7365)-1-VOL-4-PT-2
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  • 6
    Publication Date: 2019-06-27
    Description: The likely system concepts which might be representative of NASA and DoD space programs in the 1980-2000 time period were studied along with the programs' likely needs for major space transportation vehicles, orbital support vehicles, and technology developments which could be shared by the military and civilian space establishments in that time period. Such needs could then be used by NASA as an input in determining the nature of its long-range development plan. The approach used was to develop a list of possible space system concepts (initiatives) in parallel with a list of needs based on consideration of the likely environments and goals of the future. The two lists thus obtained represented what could be done, regardless of need; and what should be done, regardless of capability, respectively. A set of development program plans for space application concepts was then assembled, matching needs against capabilities, and the requirements of the space concepts for support vehicles, transportation, and technology were extracted. The process was pursued in parallel for likely military and civilian programs, and the common support needs thus identified.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-CR-148704 , ATR-76(7365)-1-VOL-1
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  • 7
    Publication Date: 2019-06-27
    Description: The results are presented of a study which identifies over 100 new and highly capable space systems for the 1980-2000 time period: civilian systems which could bring benefits to large numbers of average citizens in everyday life, much enhance the kinds and levels of public services, increase the economic motivation for industrial investment in space, expand scientific horizons; and, in the military area, systems which could materially alter current concepts of tactical and strategic engagements. The requirements for space transportation, orbital support, and technology for these systems are derived, and those requirements likely to be shared between NASA and the DoD in the time period identified. The high leverage technologies for the time period are identified as very large microwave antennas and optics, high energy power subsystems, high precision and high power lasers, microelectronic circuit complexes and data processors, mosaic solid state sensing devices, and long-life cryogenic refrigerators.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-CR-148703 , ATR-76(7365)-1-VOL-2
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  • 8
    Publication Date: 2019-06-27
    Description: Contents: (1) general study guidelines and assumptions; (2) launch vehicle performance and cost assumptions; (3) satellite programs 1959 to 1979; (4) initiative mission and design characteristics; (5) satellite listing; (6) spacecraft design model; (7) spacecraft cost model; (8) mission cost model; and (9) nominal and optimistic budget program cost summaries.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-CR-157266 , ATR-78(7667)-1-VOL-3
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  • 9
    Publication Date: 2019-06-27
    Description: NASA and DoD requirements and planning data were used in multidiscipline advanced planning investigations of space operations and associated elements (including man), identification of potential low cost approaches, vehicle design, cost synthesis techniques, technology forecasting and opportunities for DoD technology transfer, and the development near-, mid-, and far-term space initiatives and development plans with emphasis on domestic and military commonality. An overview of objectives and results are presented for the following studies: advanced space planning and conceptual analysis, shuttle users, technology assessment and new opportunities, standardization and program practice, integrated STS operations planning, solid spinning upper stage, and integrated planning support functions.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-CR-154893 , ATR-77(7379-01)-1
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  • 10
    Publication Date: 2019-07-27
    Description: Consideration is given to the hazards posed by existing and future man-made space debris to spacecraft operations. The components of the hazard are identified as those fragments resulting from spacecraft explosions and spent stages which can be tracked, those fragments which are too small to be tracked at their present distances, and future debris, which, if present trends in spacecraft design and operation continue, may lead to an unacceptably high probability of collision with operational spacecraft within a decade. It is argued that a coordinated effort must be undertaken by all space users to evaluate means of space debris control in order to allow for the future unrestricted use of near-earth space. A plan for immediate action to forestall the space debris problem by activities in the areas of education, debris monitoring and collection technology, space vehicle design, space operational procedures and practices and space policies and treaties is proposed.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: IAF PAPER 81-256 , International Astronautical Congress; Sept. 6-12, 1981; Rome; Italy
    Format: text
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