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  • computer
  • Springer  (3)
  • Blackwell Publishing Ltd
  • 1980-1984  (1)
  • 1965-1969  (2)
  • 1925-1929
  • 1982  (1)
  • 1967  (2)
Collection
Keywords
Publisher
Years
  • 1980-1984  (1)
  • 1965-1969  (2)
  • 1925-1929
Year
  • 1
    Electronic Resource
    Electronic Resource
    Computer cartography point-in-polygon programs (1967)
    Springer
    BIT 7 (1967), S. 39-64 
    Details
    ISSN: 1572-9125
    Keywords: Cartography ; computer ; polygon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The official statistics and census reports give figures only for administrative units. The boundaries of these units are often changed and hence it is very difficult to compare statistics from two different periods. However, an administrative unit can always be approximated by a polygon. Real estate data are assigned to a central point for which the coordinates are known. A computer can determine whether a point belongs to a polygon or not by means of a special program. Data for all real estate central points belonging to the actual polygon are added. In this way it will be possible to compute data for arbitrary polygons, for instance administrative units which do not exist any longer, by assigning real estate data to the central points.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01934125
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Computer derivation of algebraic equations associated with runge-kutta formulas (1967)
    Springer
    BIT 7 (1967), S. 156-162 
    Details
    ISSN: 1572-9125
    Keywords: Algebraic ; equations ; Runge-Kutta ; computer ; derivation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The derivation of algebraic non-linear equations associated with Runge-Kutta formulas increases in complexity as the order of these formulas increases. To overcome this difficulty various operational methods have been devised. But these methods are quite involved and there also exists the possibility of human errors which may be difficult to detect. The aim of this paper is the derivation of these algebraic equations through a digital computer, the IBM 7094, using Fortran IV. The technique employed is based upon a mathematical method established by the first author. With the advent of the space age there arose a continuous need for Runge-Kutta formulas of higher and higher orders. It seems that the computer offers the best, if not the only, hope in keeping up with these needs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01934278
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  • 3
    Electronic Resource
    Electronic Resource
    Gaseous equilibria in the C-H-O ternary system at 500–2000 K, 0.1–10 atm (1982)
    Springer
    Oxidation of metals 18 (1982), S. 147-162 
    Details
    ISSN: 1573-4889
    Keywords: Gas ; carbon activity ; hydrogen pressure ; oxygen pressure ; thermodynamics ; computer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The complex gaseous equilibria of approximately 10,000 different compositions in the C-H-O ternary system containing up to 40 gaseous species have been calculated at temperatures of 500, 1000, 1500, and 2000 K for total pressures of 0.1, 1.0, and 10.0 atm. The results are represented by selected isoactivity curves of carbon and isobars of hydrogen and oxygen plotted on C-H-O Gibbs composition triangles. The effects of changing composition, temperature, and pressure upon the chemical equilibria in this system are analyzed. In addition, the role of the C-H-O system in selected industrial applications is briefly discussed, including the choice of gas mixtures for the carburization of metals; the extent of carbon deposition at various temperatures, pressures, and compositions in reforming and gasification processes; the free hydrogen partial pressure in the anode compartment of fuel cells and influence of water addition; the oxygen potential in the products of combustion engines; and chemically buffered gas mixtures in controlled atmospheres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00662035
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