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The English surveyor Edward Hoppus introduced the unit in his 1736 manual of practical calculations. [ 2 ] [ 3 ] The tables include reference to stone as well as timber, as stone can similarly suffer wastage during processing into regular pieces.
Also acknowledged are claims of captive grey parrots reaching the ages of 73 and 93, [13] whereas the World Parrot Trust lists a longevity of 50–60 years for a grey in captivity. [14] The Guinness Book of World Records listed a grey parrot that allegedly lived in captivity for 72 years as the longest-lived specimen for the species. [15]
Hankinson's equation (also called Hankinson's formula or Hankinson's criterion) [1] is a mathematical relationship for predicting the off-axis uniaxial compressive strength of wood. The formula can also be used to compute the fiber stress or the stress wave velocity at the elastic limit as a function of grain angle in wood .
The formula for the surface area of a sphere is more difficult to derive: because a sphere has nonzero Gaussian curvature, it cannot be flattened out. The formula for the surface area of a sphere was first obtained by Archimedes in his work On the Sphere and Cylinder. The formula is: [6] A = 4πr 2 (sphere), where r is the radius of the sphere.
In geometric measure theory the area formula relates the Hausdorff measure of the image of a Lipschitz map, while accounting for multiplicity, to the integral of the Jacobian of the map. It is one of the fundamental results of the field that has connections, for example, to rectifiability and Sard's theorem .
The database thousands of wood anatomical descriptions and nearly 66,000 photomicrographs of contemporary woods, along with more than 1,600 descriptions and 2,000 images of fossil woods. [16] Another very important database for wood anatomy, is the so-called, Delta Intkey. [17]
In geometry, Pick's theorem provides a formula for the area of a simple polygon with integer vertex coordinates, in terms of the number of integer points within it and on its boundary. The result was first described by Georg Alexander Pick in 1899. [2] It was popularized in English by Hugo Steinhaus in the 1950 edition of his book Mathematical ...
Dipterocarpus turbinatus (Khmer chhë tië:l dâ:ng; [3] India gurjan, [4] gurjun, [4] gurgina; Tagalog mayapis; [5] Chinese 羯布罗香 jie bu luo xiang; [6] Malay language keruing, [4] the last an international name for Dipterocarpus wood) is a species of tree in the family Dipterocarpaceae native to north-eastern India and mainland Southeast Asia, and cultivated in surrounding regions.