FFD Parameters

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Field electron emission — It is requested that a diagram or diagrams be included in this article to improve its quality. For more information, refer to discussion on this page and/or the listing at Wikipedia:Requested images. Field emission (FE) (also known as field… … Wikipedia
Phenology — is the study of the times of recurring natural phenomena. The word is derived from the Greek phainomai (φαινομαι) to appear, come into view, and indicates that phenology has been principally concerned with the dates of first occurrence of natural … Wikipedia
Focal length — The focal length of an optical system is a measure of how strongly it converges (focuses) or diverges (diffuses) light. A system with a shorter focal length has greater optical power than one with a long focal length. Thin lens approximation For… … Wikipedia

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