time-scale factor
31O scale — Australian O gauge model railway O scale (or O gauge) is a scale commonly used for toy trains and model railroading. Originally introduced by German toy manufacturer Märklin around 1900, by the 1930s three rail alternating current O gauge was the …
32Weighing scale — Emperor Jahangir (reign 1605 1627) weighing his son Shah Jahan on a weighing scale by artist Manohar (AD 1615, Mughal dynasty, India). A weighing scale (usually just scales in UK and Australian English, weighing machine in south Asian English or… …
33Crop factor — The outer, red box displays what a 24×36 mm sensor would see, the inner, blue box displays what a 15×23 mm sensor would see. (The actual image circle of most lenses designed for 35 mm SLR format would extend further beyond the red box than shown… …
34Early pregnancy factor — (EPF) or early conception factor (ECF) is a protein associated with mammalian embryos shortly after fertilization. [cite journal | author = Smart Y, Roberts T, Clancy R, Cripps A | title = Early pregnancy factor: its role in mammalian… …
35Doctor Who: The Key to Time — Cover of the 2008 Region 2 DVD release Country of origin United Kingdom …
36Z-factor — In statistics, the Z factor is a measure of the quality or power of a high throughput screening (HTS) assay. It is not the same as the z score.ref|Zhang 1999 NotZScoreIn an HTS campaign, assayists often compare a large number (hundreds of… …
37SPF (sun protection factor) — A number on a scale for rating sunscreens. SPF stands for Sun Protection Factor. SPF numbers on a package can range from as low as 2 to as high as 60. These numbers refer to the product’s ability to screen or block out the sun’s burning rays. The …
38Sun protection factor (SPF) — A number on a scale for rating sunscreens. SPF stands for Sun Protection Factor. SPF numbers on a package can range from as low as 2 to as high as 60. These numbers refer to the product’s ability to screen or block out the sun’s burning rays. The …
39Resource-Based Relative Value Scale — (RBRVS) is a schema used to determine how much money medical providers should be paid. It is currently used by Medicare in the United States and by nearly every Health maintenance organizations (HMOs).RBRVS assigns procedures performed by a… …
40International Bitterness Units scale — The International Bitterness Units scale, or simply IBU scale, provides a measure of the bitterness of beer, which is provided by the hops used during brewing. An IBU is measured through the use of a spectrophotometer and solvent extraction. It… …
