The sound generated by the alternation of current in electronic devices.

(biochemistry) The Krebs cycle.

(development, software) Alternative form of software lifecycle

A cycle employed in the liquefaction of gases, especially for air separation. It is essentially the same as the Siemens cycle, except in the expansion step: where the Siemens cycle has the gas do external work to reduce its temperature, the Hampson-Linde cycle relies solely on the Joule-Thomson effect, so the cold side needs no moving parts.

(chemistry) A thermochemical cycle, used to produce hydrogen, consisting of three chemical reactions whose net reactant is water and whose net products are hydrogen and oxygen.

(chemistry) A cycle concerned with the formation of an ionic compound from the reaction of a metal (often a Group I or Group II element) with a halogen or other non-metallic element such as oxygen; used to analyze reaction energies.

(physics, astronomy) A group of nuclear reactions, that involve the interaction of protons with carbon, nitrogen and oxygen nuclei, thought to be the main source of energy in main-sequence stars of greater than 1.4 solar mass.

A power plant that uses both natural gas and steam to have higher efficiency of power generation from the same amount of fuel.