1 unrestrained by convention or morality; "Congreve draws a debauched aristocratic society"; "deplorably dissipated and degraded"; "riotous living"; "fast women" [syn: debauched, degenerate, degraded, dissolute, libertine, profligate, riotous, fast]
2 preoccupied with the pursuit of pleasure and especially games of chance; "led a dissipated life"; "a betting man"; "a card-playing son of a bitch"; "a gambling fool"; "sporting gents and their ladies" [syn: betting, card-playing, gambling, sporting]
- past of dissipate
In physics, dissipation embodies the concept of a dynamical system where important mechanical modes, such as waves or oscillations, lose energy over time, typically due to the action of friction or turbulence. The lost energy is converted into heat, raising the temperature of the system. Such systems are called dissipative systems.
For example, a wave that loses amplitude is said to dissipate. The precise nature of the effects depends on the nature of the wave: an atmospheric wave, for instance, may dissipate close to the surface due to friction with the land mass, and at higher levels due to radiative cooling.
Dissipating forces are those which can not be described by Hamiltonian formalism. Loosely speaking, friction and all similar forces which result in decoherency of energy, that is, conversion of coherent or directed energy flow into an indirected or more isotropic distribution of energy.
In computational physics, a numerical dissipation is also known as "artificial dissipation" or "artificial diffusion" or "numerical diffusion". They all mean this: when the pure advection equation--which, by definition, is free of dissipation--is solved by a numerical approximation method that reduces the amplitude and changes the shape of the initial wave in a way analogous to a diffusional process, the method is said to contain 'dissipation'.
A formal, mathematical definition of dissipation, as commonly used in the mathematical study of measure-preserving dynamical systems, is given in the article wandering set.
In river hydrologyDissipation is the process of converting mechanical energy of downward flowing water into thermal and acoustical energy. Various devices are designed in streambeds to reduce the kinetic energy of flowing waters to reduce their erosive potential on banks and river bottoms. Very often these devices look like small waterfalls or cascades, where water flows vertically or over riprap to lose some of its kinetic force.
dissipated in German: Dissipation (Physik)
dissipated in French: Dissipation
dissipated in Dutch: Dissipatie
dissipated in Japanese: 散逸
dissipated in Polish: Dyssypacja
dissipated in Russian: Диссипация
dissipated in Swedish: Dissipation
dissipated in Ukrainian: Дисипація
abandoned, abated, ablated, attenuated, bated, belittled, broadcast, burnt up, by the board, consumed, contracted, curtailed, debauched, decreased, deflated, depleted, diffuse, diminished, discrete, dispersed, dispread, disseminated, dissolute, distributed, down the drain, drained, dropped, eaten up, effete, eroded, exhausted, expended, fallen, fast, finished, forfeit, forfeited, free, free-living, gallant, gay, gone, gone to waste, high-living, impoverished, irretrievable, less, lesser, licentious, long-lost, lost, lost to, lower, lowered, miniaturized, misspent, out the window, profligate, rakehell, rakehellish, rakehelly, rakish, reduced, retrenched, riotous, run to seed, scaled-down, scattered, shorn, shorter, shrunk, shrunken, smaller, sparse, spent, sporadic, spread, squandered, straggling, straggly, strewn, strown, unbridled, used, used up, wasted, watered-down, weakened, widespread, wild, worn, worn away, worn-out