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  2. Mineral resource classification - Wikipedia

    en.wikipedia.org/wiki/Mineral_resource...

    Measured resources are indicated resources that have undergone enough further sampling that a 'competent person' (defined by the norms of the relevant mining code; usually a geologist) has declared them to be an acceptable estimate, at a high degree of confidence, of the grade (or quality), quantity, shape, densities, physical characteristics ...

  3. Current–voltage characteristic - Wikipedia

    en.wikipedia.org/wiki/Current–voltage...

    The shape of an electrical component's characteristic curve reveals much about its operating properties. I–V curves of different devices can be grouped into categories: The quadrants of the I–V plane. Power sources have curves passing through the red regions.

  4. Area - Wikipedia

    en.wikipedia.org/wiki/Area

    The area of a shape can be measured by comparing the shape to squares of a fixed size. [2] In the International System of Units (SI), the standard unit of area is the square metre (written as m 2), which is the area of a square whose sides are one metre long. [3] A shape with an area of three square metres would have the same area as three such ...

  5. Surface roughness - Wikipedia

    en.wikipedia.org/wiki/Surface_roughness

    Each of the formulas listed in the tables assumes that the roughness profile has been filtered from the raw profile data and the mean line has been calculated. The roughness profile contains n {\displaystyle n} ordered, equally spaced points along the trace, and y i {\displaystyle y_{i}} is the vertical distance from the mean line to the i th ...

  6. Mathematical morphology - Wikipedia

    en.wikipedia.org/wiki/Mathematical_morphology

    Mathematical Morphology was developed in 1964 by the collaborative work of Georges Matheron and Jean Serra, at the École des Mines de Paris, France.Matheron supervised the PhD thesis of Serra, devoted to the quantification of mineral characteristics from thin cross sections, and this work resulted in a novel practical approach, as well as theoretical advancements in integral geometry and ...

  7. Today's Wordle Hint, Answer for #1270 on Tuesday, December 10 ...

    www.aol.com/todays-wordle-hint-answer-1270...

    Hints and the solution for today's Wordle on Tuesday, December 10.

  8. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    kilopounds per square inch, that is, thousands of pounds per square inch KSI (or ksi), also abbreviated KPSI or kpsi, is a common non- SI measurement scale for ultimate tensile strength , that is, the number of units of tensile force that a material can endure per unit of cross-sectional area before breaking.

  9. Quadrat - Wikipedia

    en.wikipedia.org/wiki/Quadrat

    Quadrats typically occupy an area of 0.25 m 2 and are traditionally square, but modern quadrats can be rectangular, circular, or irregular. [1] [2] A quadrat is suitable for sampling or observing plants, slow-moving animals, and some aquatic organisms. A photo-quadrat is a photographic record of the area framed by a quadrat.