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.
APA, also known as American Psychological Association, is a citation style used to attribute sources when writing a formal document or paper. Normally, when you cite using APA format, you would include short quotations directly in the body of the text. However, if you are citing a paragraph that is longer than 40 words, you must create a free standing block quote to separate the paragraph from the rest of the document.