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A process is said to be physically reversible if it results in no increase in physical entropy; it is isentropic. There is a style of circuit design ideally exhibiting this property that is referred to as charge recovery logic , adiabatic circuits , or adiabatic computing (see Adiabatic process ).
[a] While processes in isolated systems are never reversible, [3] cyclical processes can be reversible or irreversible. [4] Reversible processes are hypothetical or idealized but central to the second law of thermodynamics. [3] Melting or freezing of ice in water is an example of a realistic process that is nearly reversible.
List of operations that are reverse computable and their costs. Based on the successful application of Reverse Computation concepts in other software domains, Chris Carothers, Kalyan Perumalla and Richard Fujimoto [9] suggest the application of reverse computation to reduce state saving overheads in parallel discrete event simulation (PDES).
Often, when analysing a dynamic thermodynamic process, the simplifying assumption is made that each intermediate state in the process is at equilibrium, producing thermodynamic processes which develop so slowly as to allow each intermediate step to be an equilibrium state and are said to be reversible processes.
Reversible reaction, a chemical reaction for which the position of the chemical equilibrium is very sensitive to the imposed physical conditions; so the reaction can be made to run either forwards or in reverse by changing those conditions; Reversible computing, logical reversibility of a computation; a computational step for which a well ...
A mathematical or physical process is time-reversible if the dynamics of the process remain well-defined when the sequence of time-states is reversed.. A deterministic process is time-reversible if the time-reversed process satisfies the same dynamic equations as the original process; in other words, the equations are invariant or symmetrical under a change in the sign of time.
Many redox processes observed by CV are quasi-reversible or non-reversible. In such cases the thermodynamic potential E 0 1/2 is often deduced by simulation. The irreversibility is indicated by i pa /i pc ≠ 1. Deviations from unity are attributable to a subsequent chemical reaction that is triggered by the electron transfer.
where a reversible path is chosen from absolute zero to the final state, so that for an isothermal reversible process Δ S = Q r e v T {\displaystyle \Delta S={Q_{rev} \over T}} . In general, for any cyclic process the state points can be connected by reversible paths, so that