WebA Lissajous curve / ˈ l ɪ s ə ʒ uː /, also known as Lissajous figure or Bowditch curve / ˈ b aʊ d ɪ tʃ /, is the graph of a system of parametric equations = ⁡ (+), = ⁡ (), which describe complex harmonic motion.This family of curves was investigated by Nathaniel Bowditch in 1815, and later in more detail in 1857 by Jules Antoine Lissajous (for whom it has been named).

WebA Penrose tiling is an example of an aperiodic tiling.Here, a tiling is a covering of the plane by non-overlapping polygons or other shapes, and aperiodic means that shifting any tiling with these shapes by any finite distance, without rotation, cannot produce the same tiling. However, despite their lack of translational symmetry, Penrose tilings may have both …

WebNikita Sergeyevich Khrushchev (15 April [O.S. 3 April] 1894 – 11 September 1971) was the First Secretary of the Communist Party of the Soviet Union from 1953 to 1964 and chairman of the country's Council of Ministers from 1958 to 1964. During his rule, Khrushchev stunned the communist world with his denunciation of Stalin's crimes, and embarked on a …

WebRené Descartes (/ d eɪ ˈ k ɑːr t / or UK: / ˈ d eɪ k ɑːr t /; French: [ʁəne dekaʁt] (); Latinized: Renatus Cartesius; 31 March 1596 – 11 February 1650: 58 ) was a French philosopher, scientist, and mathematician, widely considered a seminal figure in the emergence of modern philosophy and science.Mathematics was central to his method of inquiry, and he …

WebThe sanctions against Iraq were a comprehensive financial and trade embargo imposed by the United Nations Security Council (UNSC) on Iraq.They began August 6, 1990, four days after Iraq's invasion of Kuwait, stayed largely in force until May 22, 2003 (after Saddam Hussein's being forced from power), and persisted in part, including reparations to Kuwait.

WebRelief is a sculptural method in which the sculpted pieces are bonded to a solid background of the same material. The term relief is from the Latin verb relevo, to raise.To create a sculpture in relief is to give the impression that the sculpted material has been raised above the background plane. When a relief is carved into a flat surface of stone (relief …

WebThe geographic coordinate system (GCS) is a spherical or ellipsoidal coordinate system for measuring and communicating positions directly on the Earth as latitude and longitude. It is the simplest, oldest and most widely used of the various of spatial reference systems that are in use, and forms the basis for most others. Although latitude and longitude form a …

WebOriginal usage of the term. The original use of the term knowledge base was to describe one of the two sub-systems of an expert system.A knowledge-based system consists of a knowledge-base representing facts about the world and ways of reasoning about those facts to deduce new facts or highlight inconsistencies.. Properties. The term "knowledge …

WebA new figure is obtained by rotating these regular n/m-gons one vertex to the left on the original polygon until the number of vertices rotated equals n/m minus one, and combining these figures. An extreme case of this is where n/m is 2, ... In the hyperbolic plane, five one-parameter families and seventeen isolated cases are known, but the ...

WebScottish perspective on news, sport, business, lifestyle, food and drink and more, from Scotland's national newspaper, The Scotsman.

WebIn fluid dynamics, Couette flow is the flow of a viscous fluid in the space between two surfaces, one of which is moving tangentially relative to the other. The relative motion of the surfaces imposes a shear stress on the fluid and induces flow. Depending on the definition of the term, there may also be an applied pressure gradient in the flow direction. ...

WebSurveying or land surveying is the technique, profession, art, and science of determining the terrestrial two-dimensional or three-dimensional positions of points and the distances and angles between them. A land surveying professional is called a land surveyor.These points are usually on the surface of the Earth, and they are often used to establish maps …

WebEarth's orbital plane is known as the ecliptic plane, and Earth's tilt is known to astronomers as the obliquity of the ecliptic, being the angle between the ecliptic and the celestial equator on the celestial sphere. It is denoted by the Greek letter ε.. Earth currently has an axial tilt of about 23.44°. This value remains about the same relative to a stationary orbital plane …

WebThe Euler angles are three angles introduced by Leonhard Euler to describe the orientation of a rigid body with respect to a fixed coordinate system.. They can also represent the orientation of a mobile frame of reference in physics or the orientation of a general basis in 3-dimensional linear algebra.Alternative forms were later introduced by Peter Guthrie Tait …