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A process without transfer of heat to or from a system, so that Q = 0, is called adiabatic, and such a system is said to be adiabatically isolated. [5] [6] The simplifying assumption frequently made is that a process is adiabatic. For example, the compression of a gas within a cylinder of an engine is assumed to occur so rapidly that on the ...
Lieb and Yngvason's definition of adiabatic accessibility is: A state is adiabatically accessible from a state , in symbols (pronounced X 'precedes' Y), if it is possible to transform into in such a way that the only net effect of the process on the surroundings is that a weight has been raised or lowered (or a spring is stretched/compressed ...
Alexandria was a remarkable center of learning due to the blending of Greek and Oriental influences, its favorable situation and commercial resources, and the enlightened energy of some of the Macedonian Dynasty of the Ptolemies ruling over Egypt, in the final centuries BC.
The adiabatic theorem is a concept in quantum mechanics.Its original form, due to Max Born and Vladimir Fock (1928), was stated as follows: . A physical system remains in its instantaneous eigenstate if a given perturbation is acting on it slowly enough and if there is a gap between the eigenvalue and the rest of the Hamiltonian's spectrum.
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A property of a physical system, such as the entropy of a gas, that stays approximately constant when changes occur slowly is called an adiabatic invariant.By this it is meant that if a system is varied between two end points, as the time for the variation between the end points is increased to infinity, the variation of an adiabatic invariant between the two end points goes to zero.
The potential density of a fluid parcel at pressure is the density that the parcel would acquire if adiabatically brought to a reference pressure , often 1 bar (100 kPa). Whereas density changes with changing pressure, potential density of a fluid parcel is conserved as the pressure experienced by the parcel changes (provided no mixing with ...
Noel Hush is often credited with formulation of the theory of adiabatic electron-transfer. [3] [4]Fig. 1. Electron transfer occurs between donor (D) and acceptor (A) species separated by distance R that may be found in many forms in both condensed phases and the gas phase.