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  • 1
    Electronic Resource
    Electronic Resource
    The effect of dissolved oxygen and salinity on the toxicity of ammonia to smolts of salmon, Salmo salar L. (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 15 (1979), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The survival of Atlantic salmon smolts on exposure to constant concentrations of ammonia has been measured under laboratory conditions. At concentrations of dissolved oxygen close to the air-saturation value, the 24-h LC50 of un-ionised ammonia is 0.15 mg NH31−1 in fresh water (hardness 264 mg 1−1 as CaCO3) and 0.3 mg NH31−1 in 30% sea water; at concentrations of dissolved oxygen of 3.5 mg 1−1 in fresh water and 3.1 mg 1−1 in 30% sea water, the 24-h LC50 is 0.09 mg NH3 1−1 and 0.12 mg NH3 1−1 respectively; for fish acclimated for 1 day to a concentration of ammonia close to the 24-h median for un-acclimated fish, the median is increased between 38 and 79%, depending on test conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1979.tb03680.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Remarks on bang-bang control in a Hilbert space (1977)
    Springer
    Journal of optimization theory and applications 21 (1977), S. 51-57 
    Details
    ISSN: 1573-2878
    Keywords: Optimal control ; linear systems ; linear-quadratic problems ; bang-bang control ; Hilbert spaces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The control of a linear system, whose performance index is the sum of a linear term and a quadratic term, is considered. A necessary and sufficient condition is given for the optimal control to be bang-bang, and this is used to extend and clarify the results of Refs. 1–2. As an illustration, an application to an elliptic boundary-value problem is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00932543
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Time-optimal control of parabolic systems with boundary conditions involving time delays (1978)
    Springer
    Journal of optimization theory and applications 25 (1978), S. 563-574 
    Details
    ISSN: 1573-2878
    Keywords: Distributed control problems ; time-optimal control ; partial differential equations ; bang-bang controls
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The present paper is concerned with the control of certain parabolic systems whose boundary conditions involve time delays. The optimal controls are characterized in terms of an adjoint system and shown to be unique and bang-bang. These results extend to certain cases of nonlinear control and to fixed-time, minimum-norm control problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00933521
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    Paper (German National Licenses)
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