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  1. No Access

    Article

    Overturning of tractors

    A simple rule for design of safety cabs and frames for tractors is presented. The rule guarantees that on overturning accident is not followed by continued rolling of the tractor. Violation of the design rule ...

    J. Christoffersen in Ingenieur-Archiv (1989)

  2. No Access

    Article

    Effects of aluminum(III), chromium(III), and iron(III) on the rate of dissolution of calcium hydroxyapatite crystals in the absence and presence of the chelating agent desferrioxamine

    Aluminum ions (Al) and chromium (III) ions (Cr), as they exist in aqueous solution at neutral pH, adsorb onto calcium hydroxyapatite crystals (HAP) and severely inhibit their dissolution process, when present ...

    M. R. Christoffersen, H. C. Thyregod, J. Christoffersen in Calcified Tissue International (1987)

  3. No Access

    Chapter and Conference Paper

    Mechanisms of Normal and Pathological Demineralization Group Report

    Scientists from a wide variety of disciplines were brought together in this group in the hope that useful exchanges of ideas would in the long-term help in our understanding of the problem of demineralization,...

    J. J. Reynolds, J. Arends, J. Christoffersen… in Biological Mineralization and Demineraliza… (1982)

  4. No Access

    Chapter and Conference Paper

    The Mechanisms of Chrystal Growth and Dissolution

    Mechanisms of crystal growth and dissolution are generally best studied by means of the kinetic method, that is, by measuring the rate as a function of different parameters (first of all the concentrations) an...

    A. E. Nielsen, J. Christoffersen in Biological Mineralization and Demineralization (1982)

  5. No Access

    Chapter and Conference Paper

    Utilization of heuristics in manufacturing planning and optimization

    J. Christoffersen, P. Falster, E. Suonsivu… in 5th Conference on Optimization Techniques … (1973)

  6. No Access

    Chapter and Conference Paper

    Equilibrium and Stability of Elastic-plastic Bodies

    The existence of a yield-surface in stress-space, is generally taken to be the most fundamental feature of elastic-plastic materials. This means that stresses σ ij a ...

    J. Christoffersen in Instability of Continuous Systems (1971)