Reciprocation
121Motor variable — A function of a motor variable is a function with arguments and values in the split complex number plane, much as functions of a complex variable involve ordinary complex numbers. The split complex numbers lie in the motor plane D, a term… …
122Reciprocating motion — also called Reciprocation, is an up and down (or back and forth) motion which repeats over and over again. It is seen in a wide range of reciprocating engines and pumps.A Crank (mechanism) can be used to turn circular motion into reciprocating m …
123Dual curve — Curves, dual to each other; see below for properties. In projective geometry, a dual curve of a given plane curve C is a curve in the dual projective plane consisting of the set of lines tangent to C. There is a map from a curve to its dual,… …
124Hydropneumatic device — North American, European, and other languages refer to hydropneumatic devices such as a hydropneumatic accumulator or pulsation damper using very different words. In many cases this can cause a great deal of word usage confusion. This article… …
125Stroke (engine) — Reciprocating motion, used in reciprocating engines and other mechanisms, is back and forth motion. Each cycle of reciprocation consists of two opposite motions: there is a motion in one direction, and then a motion back in the opposite direction …
126Human behavioral ecology — (HBE) or human evolutionary ecology applies the principles of evolutionary theory and optimization to the study of human behavioral and cultural diversity. HBE examines the adaptive design of traits, behaviors, and life histories of humans in an… …
127The Eel (film) — Infobox Film name =Unagi imdb id =0120408 writer =Shohei Imamura, Daisuke Tengan, Motofumi Tomikawa, Akira Yoshimura] ] starring =Kôji Yakusho, Misa Shimizu director =Shohei Imamura producer =Hiso Ino music =Shinichirô Ikebe cinematography… …
128Pederasty in ancient Greece — Pederastic courtship scene Athenian black figure amphora, 5th c. BC, Painter of Cambridge; Object currently in the collection of the Staatliche Antikensammlungen und Glyptothek, Munich, Germany. The bearded man is depicted in a traditional… …
