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  2. Atterberg limits - Wikipedia

    en.wikipedia.org/wiki/Atterberg_limits

    The plasticity index is the size of the range of water contents where the soil exhibits plastic properties. The PI is the difference between the liquid and plastic limits (PI = LL-PL). Soils with a high PI tend to be clay, those with a lower PI tend to be silt, and those with a PI of 0 (non-plastic) tend to have little or no silt or clay.

  3. Soil food web - Wikipedia

    en.wikipedia.org/wiki/Soil_food_web

    An interaction web, shown above right, [9] is similar to a topological web, but instead of showing the movement of energy or materials, the arrows show how one group influences another. In interaction food web models, every link has two direct effects, one of the resource on the consumer and one of the consumer on the resource. [10]

  4. Sustainability metrics and indices - Wikipedia

    en.wikipedia.org/wiki/Sustainability_metrics_and...

    Writers like Leone (2005) and Yi et al. have also recently suggested that the emergy sustainability index has significant utility. In particular, Leone notes that while the GRI measures behavior, it fails to calculate supply constraints the emergy methodology aims to calculate.

  5. AASHTO Soil Classification System - Wikipedia

    en.wikipedia.org/wiki/AASHTO_Soil_Classification...

    Plasticity index: 6 max N.P. 10 max 10 max 11 min 11 min 10 max 10 max 11 min 11 min 1: Usual types of significant constituent materials stone fragments, gravel and sand fine sand silty or clayey gravel and sand silty soils clayey soils General rating as a subgrade excellent to good fair to poor

  6. Preconsolidation pressure - Wikipedia

    en.wikipedia.org/wiki/Preconsolidation_pressure

    Preconsolidation pressure is the maximum effective vertical overburden stress that a particular soil sample has sustained in the past. [1] This quantity is important in geotechnical engineering, particularly for finding the expected settlement of foundations and embankments.

  7. Plasticity index - Wikipedia

    en.wikipedia.org/?title=Plasticity_index&redirect=no

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  8. FAO Food Price Index - Wikipedia

    en.wikipedia.org/wiki/FAO_Food_Price_Index

    The Food and Agriculture Organization (FAO) Food Price Index 1961–2024 in nominal and real terms. Years 2014–2016 is 100. The FAO Food Price Index (FFPI) is a food price index by the Food and Agriculture Organization (FAO) of the United Nations. It records the development of world market prices of 24 agricultural commodities and foodstuffs ...

  9. Crack tip opening displacement - Wikipedia

    en.wikipedia.org/wiki/Crack_tip_opening_displacement

    CTOD is a single parameter that accommodates crack tip plasticity. It is easy to measure when compared with techniques such as J integral. It is a fracture parameter that has more physical meaning than the rest. However, the equivalence of CTOD and J integral is proven only for non-linear materials, but not for plastic materials.