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A painting of a gentry scholar with two courtesans, by Tang Yin, c. 1500. The four occupations (simplified Chinese: 士农工商; traditional Chinese: 士農工商; pinyin: Shì nóng gōng shāng), or "four categories of the people" (Chinese: 四民; pinyin: sì mín), [1] [2] was an occupation classification used in ancient China by either Confucian or Legalist scholars as far back as the ...
The Pareto principle may apply to fundraising, i.e. 20% of the donors contributing towards 80% of the total. The Pareto principle (also known as the 80/20 rule, the law of the vital few and the principle of factor sparsity [1] [2]) states that for many outcomes, roughly 80% of consequences come from 20% of causes (the "vital few").
The Left Book Club, the first book club in the UK, was a publishing group pioneered by Gollancz that exerted a strong left-wing influence in Great Britain from 1936 to 1948. It offered a monthly book choice, for sale to members only, as well as a newsletter that acquired the status of a major political magazine. It also held an annual rally.
A rupture disc (burst) Pressure-effect acting at a rupture disc A rupture disc, also known as a pressure safety disc, burst disc, bursting disc, or burst diaphragm, is a non-reclosing pressure relief safety device that, in most uses, protects a pressure vessel, equipment or system from overpressurization or potentially damaging vacuum conditions.
The entrance to SLAC in Menlo Park. Founded in 1962 as the Stanford Linear Accelerator Center, the facility is located on 172 ha (426 acres) of Stanford University-owned land on Sand Hill Road in Menlo Park, California, just west of the university's main campus.
[74] [75] The ASIP gene has a 75–80% variation rate among Eurasian populations compared to 20–25% in African populations. [76] Variations in the SLC24A5 gene account for 20–25% of the variation between dark and light skinned populations of Africa, [ 77 ] and appear to have arisen as recently as within the last 10,000 years. [ 78 ]
This book was the forerunner of the International tables for crystallography, which first appeared in 1935. 1923 - Roscoe Dickinson and Albert Raymond, and independently, H.J. Gonell and Hermann Mark , first showed that an organic molecule, specifically hexamethylenetetramine , could be characterized by x-ray crystallography.