1 Decoherence-free subspaces, subspace of a system's Hilbert space where the system is decoupled from the environment.  Dynamic Frequency Selection, part of the IEEE 802.11h wireless standard.
The American Psychological Association (APA) is a scientific and professional organization that represents psychologists in the United States.
The Administrative Procedure Act 1946[i] (APA) sets the standards for administrative agencies in exercising their lawmaking powers. The standards laid down by the APA also help federal courts whenever they are faced with suits challenging the rules and regulations created by the agencies.