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1960 – First recorded use of the term "finite element method" by Ray Clough to describe the earlier methods of Richard Courant, Alexander Hrennikoff and Olgierd Zienkiewicz in structural analysis. [50] 1961 – John G.F. Francis [51] [52] and Vera Kublanovskaya [53] invent QR factorization (voted one of the top 10 algorithms of the 20th century).
Various post-Renaissance authors have compiled expanded lists of "simple machines", often using terms like basic machines, [9] compound machines, [6] or machine elements to distinguish them from the classical simple machines above. By the late 1800s, Franz Reuleaux [11] had identified hundreds of machine elements, calling them simple machines. [12]
This progression, or flow, from machine to machine was often planned and documented with detailed flowcharts that used standardized symbols for documents and the various machine functions. [6] All but the earliest machines had high-speed mechanical feeders to process cards at rates from around 100 to 2,000 per minute, sensing punched holes with ...
Simple machines provide a "vocabulary" for understanding more complex machines. The idea that a machine can be decomposed into simple movable elements led Archimedes to define the lever, pulley and screw as simple machines. By the time of the Renaissance this list increased to include the wheel and axle, wedge and inclined plane.
[6] [7] B. F. Skinner was responsible for a different type of machine which used his ideas on how learning should be directed with positive reinforcement. [8] Skinner advocated the use of teaching machines for a broad range of students (e.g., preschool aged to adult) and instructional purposes (e.g., reading and music).
For output, the machine would have a printer, a curve plotter, and a bell. [9] The machine would also be able to punch numbers onto cards to be read in later. It employed ordinary base-10 fixed-point arithmetic. [9] There was to be a store (that is, a memory) capable of holding 1,000 numbers of 40 decimal digits [15] each (ca. 16.6 kB).
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