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  • Articles: DFG German National Licenses  (2)
  • Key words. Genetic algorithm; Heuristics; Optimisation; Truss design  (1)
  • lakes  (1)
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  • Articles: DFG German National Licenses  (2)
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Years
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Engineering with computers 15 (1999), S. 345-355 
    ISSN: 1435-5663
    Keywords: Key words. Genetic algorithm; Heuristics; Optimisation; Truss design
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract. A heuristic method of seeding the initial population of a Genetic Algorithm (GA) is described, which enables better solutions to discrete truss optimisation problems to be found within a shorter time period, and with a negligible increase in computational effort (compared with the simple GA). The seeding method is entirely automatic, and makes use of the problem-specific routines used to calculate fitness, already present within the GA. The GA models natural, biological evolution as a means of producing a ‘good’ solution to a problem. The GA described here is implemented in various versions. The differences between each version are in the selection procedure and/or the generation of the initial population. To compare the effectiveness of each strategy the GA variants are applied to four example problems.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Biogeochemistry 5 (1988), S. 263-273 
    ISSN: 1573-515X
    Keywords: stable isotopes ; sulfur ; sulfate ; precipitation ; streams ; lakes ; watershed ; Canadian Shield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The isotopic composition of sulfur in sulfate from precipitation, stream inflows and outflow of the Lake 239 watershed at the Experimental Lakes Area, northwestern Ontario, was monitored for four years, 1982–1985. Rainfall had δ34S of 3–9and a three year mean value weighted by the mass of sulfate of 4.8‰ Sulfur in streams ranged from 5–15 and displayed a pronounced seasonal pattern in which δ34S showed significant negative correlations with both streamflows and sulfate concentrations. Outflow values were much more constant and averaged 6.4‰ over the three year period. Sulfate reduction or sorption favoring retention of the lighter isotope in the watershed was the probable cause of the isotopic variation of the sulfur isotopes in the streams. A sulfur isotope budget for the lake balanced within 1‰
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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