and they are typically formulated in tensorial form by using the classical framework of continuum mechanics. Continuum constitutive equations can also be formulated in vectorial form through the microplane theory ( Taylor, 1938 ), which has a number of advantages over tensorial formulations. Microplane models do not need to be formulated as functions of macroscopic stress and strain tensor invariants ( Bažant and Oh, 1985 ) and the principle of frame indifference, however, is satisfied by using micro-planes that sample (without bias) all possible orientations in the
Peter Surový, Cati Dinis, Róbert Marušák and Nuno de Almeida Ribeiro
preparation and scanning protocol for computerised analysis of root length and diameter. Plant and Soil, 218:185-196.
Costa, C., Dwyer, L., M., Hamilton, R. I., Hamel, C., Nantais, L., Smith, D. L., 2000: A Sampling Method for Measurement of Large Root Systems with Scanner-Based Image Analysis. Agronomy Journal, 4:621-627.
Doyle, W., 1962: Operation useful for similarity-invariant pattern recognition. Journal of the Association for Computing Machinery, 9:259-267.
Ewing, R. P., Kaspar, T. C., 1995: Accurate perimeter and length