perturbed system
81HEBREW LITERATURE, MODERN — definition and scope beginnings periodization …
82Myelin — Structure of a typical neuron Myelin sheath Dendrite …
83Celestial mechanics — is the branch of astrophysics that deals with the motions of celestial objects. The field applies principles of physics, historically classical mechanics, to astronomical objects such as stars and planets to produce ephemeris data. Orbital… …
84Structural information theory — (SIT) is a theory about human perception and, in particular, about perceptual organization, that is, about the way the human visual system organizes a raw visual stimulus into objects and object parts. SIT was initiated, in the 1960s, by Emanuel… …
85Action (physics) — In physics, the action is a particular quantity in a physical system that can be used to describe its operation. Action is an alternative to differential equations. The action is not necessarily the same for different types of systems.The action… …
86Joseon Dynasty — Joseon redirects here. For other uses, see Joseon (disambiguation). Kingdom of Joseon 조선국 (朝鮮國)[1] 조선왕조 (朝鮮王朝) …
87Statically indeterminate — In statics, a structure is statically indeterminate when the static equilibrium equations are not sufficient for determining the internal forces and reactions on that structure.Based on Newton s laws of motion, the equilibrium equations available …
88Main-belt comet — Asteroid 596 Scheila displaying a comet like appearance on December 12, 2010. Main belt comets are bodies orbiting within the main asteroid belt which have shown cometary activity during part of their orbit. The Jet Propulsion Laboratory defines… …
89Debris disk — Hubble Space Telescope observation of the debris ring around Fomalhaut. The inner edge of the disk may have been shaped by the orbit of Fomalhaut b, at lower right. A debris disk is a circumstellar disk of dust and debris in orbit around a star.… …
90mercury — /merr kyeuh ree/, n., pl. mercuries. 1. Chem. a heavy, silver white, highly toxic metallic element, the only one that is liquid at room temperature; quicksilver: used in barometers, thermometers, pesticides, pharmaceutical preparations,… …
