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Look up NF in Wiktionary, the free dictionary. |
NF may refer to:
- Science and medical
- Neurofibromatosis, a medical disorder in which nerve tissues grow tumors
- Necrotizing fasciitis, a disease commonly known as flesh-eating bacteria
- Nod factor, a kind of molecule
- Noise figure, a concept in radar signal processing
- National Formulary, a manual of medicines
- Companies and organizations
- Air Vanuatu, IATA airline designator NF
- National Front (disambiguation), the name of many political parties
- NF Board, a football association
- Nuestra Familia, a criminal organization
- Geography
- Newfoundland and Labrador, a Canadian province, former postal code NF
- Norfolk Island, part of the Commonwealth of Australia
- Other uses
- New Foundations, an axiomatic set theory in mathematical logic
- Normal forms (databases), criteria for determining a table's degree of vulnerability to logical inconsistencies and anomalies.
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National Fantasy Fan Federation
The National Fantasy Fan Federation (N3F or NFFF) is one of the world's oldest science fiction fandom organizations. The organization was founded in April 1941 when all science fiction, horror, and fantasy literature was lumped into one category called "fantasy." The group actively encourages the development of writers, editors, and artists.
History
The group was founded by a loose cadre of members of Boston, Massachusetts-based Stranger Club who were inspired by the Damon Knight article Unite - or Fie! published in that month's Fanfare. Knight said the withering of "New Fandom" should be counteracted by the creation of a general-purpose organization to link avid readers of all forms of speculative fiction. The club still exists today and continues to reach many of its members by regular mail, though it now has a growing online presence with its Web site and related mailing lists via the Internet.
Organization and Services
The N3F has a president, treasurer, secretary and directorate which handles the day-to-day operation of the club's business. The president and directorate are elected by the membership.
Tetrafluorohydrazine
Tetrafluorohydrazine or dinitrogen tetrafluoride, N2F4, is a colourless, reactive inorganic gas. It is a fluorinated analog of hydrazine. It is a highly hazardous chemical. In the presence of organic materials, it reacts explosively.
Tetrafluorohydrazine is manufactured from nitrogen trifluoride using an iron catalyst or iron(II) fluoride. It is used in some chemical syntheses, as a precursor or a catalyst.
Tetrafluorohydrazine was used as a high-energy liquid oxidizer in some never-flown rocket fuel formulas. In 1959 it was considered new for this application.
