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  • 1
    Electronic Resource
    Electronic Resource
    MUTAGENICITY OF HEATED COTTONSEED FRYING OIL (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food safety 7 (1986), S. 0 
    Details
    ISSN: 1745-4565
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A control experiment showed that cottonseed oil used in frying falafel developed significant mutagenic activity. As a result, one hundred samples of fresh and used cottonseed oil employed commercially for frying falafel were collected from restaurants in thirteen major cities of Egypt. Samples were examined for mutagenic activity using the Salmonella typhimurium assay with and without S9. Six of the heated oil samples showed significant mutagenic activity. None of the fresh unheated oil samples were mutagenic. Salmonella typhimurium TA 102 gave a higher response than did either TA 100 or TA 98.Peroxide, hydroxyl, acid and conjugated diene values were much higher for mutagenic samples. Iodine values, however, were lower. Liquid chromatography fractionation revealed that the mutagenicity was concentrated in the polar fraction. The column fraction having the highest mutagenic activity was further examined by chromatographic and spectroscopic techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-4565.1986.tb00542.x
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  • 2
    Electronic Resource
    Electronic Resource
    Mitotic Activity in the Skin of Mice Deficient in Essential Fatty Acids (1965)
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 1395-1395 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] BUB mice were kept on a fat-free diet for 10-12 weeks. The diet consisted of Fenton's casein No. 4, 5 g; salt mix No. 2, 4 g; vitamin-free test casein, 15 g; dextrose, 72 g; non-nutritive fibre, 4 g. Control mice were kept on Purina lab. chow. A male and a female essential fatty acids deficient ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2071395a0
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  • 3
    Electronic Resource
    Electronic Resource
    An inverse method for the design of axisymmetric optimal diffusers (1986)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 22 (1986), S. 377-394 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: An inverse inviscid-boundary-layer interaction scheme is presented for the optimal design of axisymmetric ducts for subsonic, rotational flows. Distribution of the shape factor H on the duct wall, giving minimum total pressure loss and maximum static pressure rise, is used as boundary condition for the inverse integral boundary-layer solution, to obtain the velocity and displacement thickness distributions on the wall. Vector addition of the inviscid core radius, derived from the solution of the inverse inviscid flow equations, and the displacement thickness produces the desired duct shape.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620220207
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  • 4
    Electronic Resource
    Electronic Resource
    Finite-time null controllability for a class of linear evolution equations on a Banach space with control constraints (1985)
    Springer
    Journal of optimization theory and applications 47 (1985), S. 129-158 
    Details
    ISSN: 1573-2878
    Keywords: Linear evolution equations ; Banach spaces ; controllability ; constrained controls ; existence of time-optimal controls ; maximum principle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We present some necessary and sufficient conditions for null controllability for a class of general linear evolution equations on a Banach space with constraints on the control space. We also present a result on the existence of time-optimal controls and some partial results on the maximum principle. Some interesting insights that can be obtained from these results are discussed, and the paper is concluded with an application to a boundary control problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940766
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  • 5
    Electronic Resource
    Electronic Resource
    Stabilization of a class of hybrid systems arising in flexible spacecraft (1986)
    Springer
    Journal of optimization theory and applications 50 (1986), S. 83-108 
    Details
    ISSN: 1573-2878
    Keywords: Flexible spacecraft ; dynamic modelling ; coupled systems of ordinary and partial differential equations ; system stabilization ; Lyapunov's functionals ; feedback control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We consider the problem of rigorous modelling of flexible spacecraft and their stabilization. It is shown that the dynamics of the flexible spacecraft can be described by a coupled system of ordinary differential equations and partial differential equations (hybrid system). Lyapunov's approach is used to prove the stabilizability of the system. Simple feedback controls are suggested for stabilization of flexible spacecraft.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00938479
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  • 6
    Electronic Resource
    Electronic Resource
    Existence of optimal controls for a class of systems governed by differential inclusions on a Banach space (1986)
    Springer
    Journal of optimization theory and applications 50 (1986), S. 213-237 
    Details
    ISSN: 1573-2878
    Keywords: Differential inclusions ; Banach spaces having Radon-Nikodym property ; mild solutions ; Polish spaces ; relaxed controls ; measure-valued controls ; Cesari property ; distributed controls ; boundary controls
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Using Cesari's approach, we prove the existence of optimal controls for a class of systems governed by differential inclusions on a Banach space having the Radon-Nikodym property. Theorem 3.1 gives the existence result for optimal relaxed controls under fairly general assumptions on the system and the admissible controls. This result depends on a fundamental result (Theorem 2.1) that proves the existence of mild solutions of differential inclusions on a Banach space, which has also independent interest. Further, the preparatory results, such as Lemma 3.1 and Lemma 3.2, are also useful in the study of time-optimal and terminal control problems. For illustration of the results, we present two examples, one on distributed controls for a class of systems governed by nonlinear parabolic equations and the other on boundary controls with discontinuous boundary operator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00939270
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  • 7
    Electronic Resource
    Electronic Resource
    On the maximum principle for time-optimal controls for a class of distributed-boundary control problems (1985)
    Springer
    Journal of optimization theory and applications 45 (1985), S. 147-157 
    Details
    ISSN: 1573-2878
    Keywords: Maximum principle ; distributed-boundary controls ; time-optimal control ; bang-bang principle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this note, we present the necessary conditions of optimality for time-optimal controls for a class of distributed-boundary control problems in general Banach spaces using the semigroup theory. Theorem 3.1 is based on a recent general maximum principle due to Barbu (Ref. 1), which was proved for strictly convex reflexive Banach spaces. Theorem 3.2 generalizes this result (for time-optimal control problems) by lifting the assumption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940819
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  • 8
    Electronic Resource
    Electronic Resource
    A functional analysis method of estimating the settling time of time-varying systems (1969)
    Springer
    Journal of engineering mathematics 3 (1969), S. 337-343 
    Details
    ISSN: 1573-2703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Technology
    Notes: Summary In this paper a functional analysis formulation is used to determine approximately the settling time of a class of time-varying feed-back systems. A computational algorithm to determine the settling time is also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01535305
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